4217 lines
95 KiB
C
4217 lines
95 KiB
C
/*-
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* Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa
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* Copyright (c) 2014 Yandex LLC
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* Copyright (c) 2014 Alexander V. Chernikov
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*
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* Supported by: Valeria Paoli
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Control socket and rule management routines for ipfw.
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* Control is currently implemented via IP_FW3 setsockopt() code.
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*/
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#include "opt_ipfw.h"
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#include "opt_inet.h"
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#ifndef INET
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#error IPFIREWALL requires INET.
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#endif /* INET */
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h> /* struct m_tag used by nested headers */
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/rwlock.h>
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#include <sys/rmlock.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/fnv_hash.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <net/vnet.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <netinet/in.h>
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#include <netinet/ip_var.h> /* hooks */
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#include <netinet/ip_fw.h>
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#include <netpfil/ipfw/ip_fw_private.h>
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#include <netpfil/ipfw/ip_fw_table.h>
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#ifdef MAC
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#include <security/mac/mac_framework.h>
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#endif
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static int ipfw_ctl(struct sockopt *sopt);
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static int check_ipfw_rule_body(ipfw_insn *cmd, int cmd_len,
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struct rule_check_info *ci);
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static int check_ipfw_rule1(struct ip_fw_rule *rule, int size,
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struct rule_check_info *ci);
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static int check_ipfw_rule0(struct ip_fw_rule0 *rule, int size,
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struct rule_check_info *ci);
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static int rewrite_rule_uidx(struct ip_fw_chain *chain,
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struct rule_check_info *ci);
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#define NAMEDOBJ_HASH_SIZE 32
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struct namedobj_instance {
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struct namedobjects_head *names;
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struct namedobjects_head *values;
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uint32_t nn_size; /* names hash size */
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uint32_t nv_size; /* number hash size */
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u_long *idx_mask; /* used items bitmask */
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uint32_t max_blocks; /* number of "long" blocks in bitmask */
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uint32_t count; /* number of items */
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uint16_t free_off[IPFW_MAX_SETS]; /* first possible free offset */
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objhash_hash_f *hash_f;
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objhash_cmp_f *cmp_f;
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};
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#define BLOCK_ITEMS (8 * sizeof(u_long)) /* Number of items for ffsl() */
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static uint32_t objhash_hash_name(struct namedobj_instance *ni, void *key,
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uint32_t kopt);
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static uint32_t objhash_hash_idx(struct namedobj_instance *ni, uint32_t val);
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static int objhash_cmp_name(struct named_object *no, void *name, uint32_t set);
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MALLOC_DEFINE(M_IPFW, "IpFw/IpAcct", "IpFw/IpAcct chain's");
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static int dump_config(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
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struct sockopt_data *sd);
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static int add_rules(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
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struct sockopt_data *sd);
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static int del_rules(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
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struct sockopt_data *sd);
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static int clear_rules(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
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struct sockopt_data *sd);
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static int move_rules(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
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struct sockopt_data *sd);
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static int manage_sets(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
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struct sockopt_data *sd);
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static int dump_soptcodes(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
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struct sockopt_data *sd);
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static int dump_srvobjects(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
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struct sockopt_data *sd);
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/* ctl3 handler data */
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struct mtx ctl3_lock;
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#define CTL3_LOCK_INIT() mtx_init(&ctl3_lock, "ctl3_lock", NULL, MTX_DEF)
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#define CTL3_LOCK_DESTROY() mtx_destroy(&ctl3_lock)
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#define CTL3_LOCK() mtx_lock(&ctl3_lock)
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#define CTL3_UNLOCK() mtx_unlock(&ctl3_lock)
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static struct ipfw_sopt_handler *ctl3_handlers;
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static size_t ctl3_hsize;
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static uint64_t ctl3_refct, ctl3_gencnt;
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#define CTL3_SMALLBUF 4096 /* small page-size write buffer */
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#define CTL3_LARGEBUF 16 * 1024 * 1024 /* handle large rulesets */
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static int ipfw_flush_sopt_data(struct sockopt_data *sd);
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static struct ipfw_sopt_handler scodes[] = {
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{ IP_FW_XGET, 0, HDIR_GET, dump_config },
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{ IP_FW_XADD, 0, HDIR_BOTH, add_rules },
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{ IP_FW_XDEL, 0, HDIR_BOTH, del_rules },
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{ IP_FW_XZERO, 0, HDIR_SET, clear_rules },
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{ IP_FW_XRESETLOG, 0, HDIR_SET, clear_rules },
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{ IP_FW_XMOVE, 0, HDIR_SET, move_rules },
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{ IP_FW_SET_SWAP, 0, HDIR_SET, manage_sets },
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{ IP_FW_SET_MOVE, 0, HDIR_SET, manage_sets },
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{ IP_FW_SET_ENABLE, 0, HDIR_SET, manage_sets },
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{ IP_FW_DUMP_SOPTCODES, 0, HDIR_GET, dump_soptcodes },
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{ IP_FW_DUMP_SRVOBJECTS,0, HDIR_GET, dump_srvobjects },
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};
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static int
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set_legacy_obj_kidx(struct ip_fw_chain *ch, struct ip_fw_rule0 *rule);
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static struct opcode_obj_rewrite *find_op_rw(ipfw_insn *cmd,
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uint16_t *puidx, uint8_t *ptype);
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static int mark_object_kidx(struct ip_fw_chain *ch, struct ip_fw *rule,
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uint32_t *bmask);
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static int ref_rule_objects(struct ip_fw_chain *ch, struct ip_fw *rule,
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struct rule_check_info *ci, struct obj_idx *oib, struct tid_info *ti);
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static int ref_opcode_object(struct ip_fw_chain *ch, ipfw_insn *cmd,
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struct tid_info *ti, struct obj_idx *pidx, int *unresolved);
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static void unref_rule_objects(struct ip_fw_chain *chain, struct ip_fw *rule);
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static void unref_oib_objects(struct ip_fw_chain *ch, ipfw_insn *cmd,
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struct obj_idx *oib, struct obj_idx *end);
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static int export_objhash_ntlv(struct namedobj_instance *ni, uint16_t kidx,
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struct sockopt_data *sd);
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/*
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* Opcode object rewriter variables
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*/
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struct opcode_obj_rewrite *ctl3_rewriters;
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static size_t ctl3_rsize;
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/*
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* static variables followed by global ones
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*/
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static VNET_DEFINE(uma_zone_t, ipfw_cntr_zone);
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#define V_ipfw_cntr_zone VNET(ipfw_cntr_zone)
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void
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ipfw_init_counters()
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{
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V_ipfw_cntr_zone = uma_zcreate("IPFW counters",
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IPFW_RULE_CNTR_SIZE, NULL, NULL, NULL, NULL,
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UMA_ALIGN_PTR, UMA_ZONE_PCPU);
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}
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void
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ipfw_destroy_counters()
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{
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uma_zdestroy(V_ipfw_cntr_zone);
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}
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struct ip_fw *
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ipfw_alloc_rule(struct ip_fw_chain *chain, size_t rulesize)
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{
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struct ip_fw *rule;
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rule = malloc(rulesize, M_IPFW, M_WAITOK | M_ZERO);
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rule->cntr = uma_zalloc(V_ipfw_cntr_zone, M_WAITOK | M_ZERO);
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return (rule);
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}
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static void
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free_rule(struct ip_fw *rule)
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{
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uma_zfree(V_ipfw_cntr_zone, rule->cntr);
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free(rule, M_IPFW);
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}
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/*
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* Find the smallest rule >= key, id.
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* We could use bsearch but it is so simple that we code it directly
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*/
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int
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ipfw_find_rule(struct ip_fw_chain *chain, uint32_t key, uint32_t id)
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{
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int i, lo, hi;
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struct ip_fw *r;
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for (lo = 0, hi = chain->n_rules - 1; lo < hi;) {
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i = (lo + hi) / 2;
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r = chain->map[i];
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if (r->rulenum < key)
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lo = i + 1; /* continue from the next one */
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else if (r->rulenum > key)
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hi = i; /* this might be good */
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else if (r->id < id)
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lo = i + 1; /* continue from the next one */
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else /* r->id >= id */
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hi = i; /* this might be good */
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}
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return hi;
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}
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/*
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* Builds skipto cache on rule set @map.
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*/
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static void
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update_skipto_cache(struct ip_fw_chain *chain, struct ip_fw **map)
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{
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int *smap, rulenum;
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int i, mi;
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IPFW_UH_WLOCK_ASSERT(chain);
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mi = 0;
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rulenum = map[mi]->rulenum;
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smap = chain->idxmap_back;
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if (smap == NULL)
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return;
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for (i = 0; i < 65536; i++) {
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smap[i] = mi;
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/* Use the same rule index until i < rulenum */
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if (i != rulenum || i == 65535)
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continue;
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/* Find next rule with num > i */
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rulenum = map[++mi]->rulenum;
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while (rulenum == i)
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rulenum = map[++mi]->rulenum;
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}
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}
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/*
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* Swaps prepared (backup) index with current one.
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*/
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static void
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swap_skipto_cache(struct ip_fw_chain *chain)
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{
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int *map;
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IPFW_UH_WLOCK_ASSERT(chain);
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IPFW_WLOCK_ASSERT(chain);
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map = chain->idxmap;
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chain->idxmap = chain->idxmap_back;
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chain->idxmap_back = map;
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}
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/*
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* Allocate and initialize skipto cache.
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*/
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void
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ipfw_init_skipto_cache(struct ip_fw_chain *chain)
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{
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int *idxmap, *idxmap_back;
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idxmap = malloc(65536 * sizeof(uint32_t *), M_IPFW,
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M_WAITOK | M_ZERO);
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idxmap_back = malloc(65536 * sizeof(uint32_t *), M_IPFW,
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M_WAITOK | M_ZERO);
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/*
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* Note we may be called at any time after initialization,
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* for example, on first skipto rule, so we need to
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* provide valid chain->idxmap on return
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*/
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IPFW_UH_WLOCK(chain);
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if (chain->idxmap != NULL) {
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IPFW_UH_WUNLOCK(chain);
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free(idxmap, M_IPFW);
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free(idxmap_back, M_IPFW);
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return;
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}
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/* Set backup pointer first to permit building cache */
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chain->idxmap_back = idxmap_back;
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update_skipto_cache(chain, chain->map);
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IPFW_WLOCK(chain);
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/* It is now safe to set chain->idxmap ptr */
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chain->idxmap = idxmap;
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swap_skipto_cache(chain);
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IPFW_WUNLOCK(chain);
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IPFW_UH_WUNLOCK(chain);
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}
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/*
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* Destroys skipto cache.
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*/
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void
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ipfw_destroy_skipto_cache(struct ip_fw_chain *chain)
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{
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if (chain->idxmap != NULL)
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free(chain->idxmap, M_IPFW);
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if (chain->idxmap != NULL)
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free(chain->idxmap_back, M_IPFW);
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}
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/*
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* allocate a new map, returns the chain locked. extra is the number
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* of entries to add or delete.
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*/
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static struct ip_fw **
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get_map(struct ip_fw_chain *chain, int extra, int locked)
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{
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for (;;) {
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struct ip_fw **map;
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int i, mflags;
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mflags = M_ZERO | ((locked != 0) ? M_NOWAIT : M_WAITOK);
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i = chain->n_rules + extra;
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map = malloc(i * sizeof(struct ip_fw *), M_IPFW, mflags);
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if (map == NULL) {
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printf("%s: cannot allocate map\n", __FUNCTION__);
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return NULL;
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}
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if (!locked)
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IPFW_UH_WLOCK(chain);
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if (i >= chain->n_rules + extra) /* good */
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return map;
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/* otherwise we lost the race, free and retry */
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if (!locked)
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IPFW_UH_WUNLOCK(chain);
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free(map, M_IPFW);
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}
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}
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/*
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* swap the maps. It is supposed to be called with IPFW_UH_WLOCK
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*/
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static struct ip_fw **
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swap_map(struct ip_fw_chain *chain, struct ip_fw **new_map, int new_len)
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{
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struct ip_fw **old_map;
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IPFW_WLOCK(chain);
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chain->id++;
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chain->n_rules = new_len;
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old_map = chain->map;
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chain->map = new_map;
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swap_skipto_cache(chain);
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IPFW_WUNLOCK(chain);
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return old_map;
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}
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static void
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export_cntr1_base(struct ip_fw *krule, struct ip_fw_bcounter *cntr)
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{
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cntr->size = sizeof(*cntr);
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if (krule->cntr != NULL) {
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cntr->pcnt = counter_u64_fetch(krule->cntr);
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cntr->bcnt = counter_u64_fetch(krule->cntr + 1);
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cntr->timestamp = krule->timestamp;
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}
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if (cntr->timestamp > 0)
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cntr->timestamp += boottime.tv_sec;
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}
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static void
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export_cntr0_base(struct ip_fw *krule, struct ip_fw_bcounter0 *cntr)
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{
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if (krule->cntr != NULL) {
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cntr->pcnt = counter_u64_fetch(krule->cntr);
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cntr->bcnt = counter_u64_fetch(krule->cntr + 1);
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cntr->timestamp = krule->timestamp;
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}
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if (cntr->timestamp > 0)
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cntr->timestamp += boottime.tv_sec;
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}
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/*
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* Copies rule @urule from v1 userland format (current).
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* to kernel @krule.
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* Assume @krule is zeroed.
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*/
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static void
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import_rule1(struct rule_check_info *ci)
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{
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struct ip_fw_rule *urule;
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struct ip_fw *krule;
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urule = (struct ip_fw_rule *)ci->urule;
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krule = (struct ip_fw *)ci->krule;
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/* copy header */
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krule->act_ofs = urule->act_ofs;
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krule->cmd_len = urule->cmd_len;
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krule->rulenum = urule->rulenum;
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krule->set = urule->set;
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krule->flags = urule->flags;
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/* Save rulenum offset */
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ci->urule_numoff = offsetof(struct ip_fw_rule, rulenum);
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/* Copy opcodes */
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memcpy(krule->cmd, urule->cmd, krule->cmd_len * sizeof(uint32_t));
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}
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/*
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* Export rule into v1 format (Current).
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* Layout:
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* [ ipfw_obj_tlv(IPFW_TLV_RULE_ENT)
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* [ ip_fw_rule ] OR
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* [ ip_fw_bcounter ip_fw_rule] (depends on rcntrs).
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* ]
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* Assume @data is zeroed.
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*/
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static void
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export_rule1(struct ip_fw *krule, caddr_t data, int len, int rcntrs)
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{
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struct ip_fw_bcounter *cntr;
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struct ip_fw_rule *urule;
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ipfw_obj_tlv *tlv;
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/* Fill in TLV header */
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tlv = (ipfw_obj_tlv *)data;
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tlv->type = IPFW_TLV_RULE_ENT;
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tlv->length = len;
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if (rcntrs != 0) {
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/* Copy counters */
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cntr = (struct ip_fw_bcounter *)(tlv + 1);
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urule = (struct ip_fw_rule *)(cntr + 1);
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export_cntr1_base(krule, cntr);
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} else
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urule = (struct ip_fw_rule *)(tlv + 1);
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/* copy header */
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urule->act_ofs = krule->act_ofs;
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urule->cmd_len = krule->cmd_len;
|
|
urule->rulenum = krule->rulenum;
|
|
urule->set = krule->set;
|
|
urule->flags = krule->flags;
|
|
urule->id = krule->id;
|
|
|
|
/* Copy opcodes */
|
|
memcpy(urule->cmd, krule->cmd, krule->cmd_len * sizeof(uint32_t));
|
|
}
|
|
|
|
|
|
/*
|
|
* Copies rule @urule from FreeBSD8 userland format (v0)
|
|
* to kernel @krule.
|
|
* Assume @krule is zeroed.
|
|
*/
|
|
static void
|
|
import_rule0(struct rule_check_info *ci)
|
|
{
|
|
struct ip_fw_rule0 *urule;
|
|
struct ip_fw *krule;
|
|
int cmdlen, l;
|
|
ipfw_insn *cmd;
|
|
ipfw_insn_limit *lcmd;
|
|
ipfw_insn_if *cmdif;
|
|
|
|
urule = (struct ip_fw_rule0 *)ci->urule;
|
|
krule = (struct ip_fw *)ci->krule;
|
|
|
|
/* copy header */
|
|
krule->act_ofs = urule->act_ofs;
|
|
krule->cmd_len = urule->cmd_len;
|
|
krule->rulenum = urule->rulenum;
|
|
krule->set = urule->set;
|
|
if ((urule->_pad & 1) != 0)
|
|
krule->flags |= IPFW_RULE_NOOPT;
|
|
|
|
/* Save rulenum offset */
|
|
ci->urule_numoff = offsetof(struct ip_fw_rule0, rulenum);
|
|
|
|
/* Copy opcodes */
|
|
memcpy(krule->cmd, urule->cmd, krule->cmd_len * sizeof(uint32_t));
|
|
|
|
/*
|
|
* Alter opcodes:
|
|
* 1) convert tablearg value from 65335 to 0
|
|
* 2) Add high bit to O_SETFIB/O_SETDSCP values (to make room for targ).
|
|
* 3) convert table number in iface opcodes to u16
|
|
*/
|
|
l = krule->cmd_len;
|
|
cmd = krule->cmd;
|
|
cmdlen = 0;
|
|
|
|
for ( ; l > 0 ; l -= cmdlen, cmd += cmdlen) {
|
|
cmdlen = F_LEN(cmd);
|
|
|
|
switch (cmd->opcode) {
|
|
/* Opcodes supporting tablearg */
|
|
case O_TAG:
|
|
case O_TAGGED:
|
|
case O_PIPE:
|
|
case O_QUEUE:
|
|
case O_DIVERT:
|
|
case O_TEE:
|
|
case O_SKIPTO:
|
|
case O_CALLRETURN:
|
|
case O_NETGRAPH:
|
|
case O_NGTEE:
|
|
case O_NAT:
|
|
if (cmd->arg1 == 65535)
|
|
cmd->arg1 = IP_FW_TARG;
|
|
break;
|
|
case O_SETFIB:
|
|
case O_SETDSCP:
|
|
if (cmd->arg1 == 65535)
|
|
cmd->arg1 = IP_FW_TARG;
|
|
else
|
|
cmd->arg1 |= 0x8000;
|
|
break;
|
|
case O_LIMIT:
|
|
lcmd = (ipfw_insn_limit *)cmd;
|
|
if (lcmd->conn_limit == 65535)
|
|
lcmd->conn_limit = IP_FW_TARG;
|
|
break;
|
|
/* Interface tables */
|
|
case O_XMIT:
|
|
case O_RECV:
|
|
case O_VIA:
|
|
/* Interface table, possibly */
|
|
cmdif = (ipfw_insn_if *)cmd;
|
|
if (cmdif->name[0] != '\1')
|
|
break;
|
|
|
|
cmdif->p.kidx = (uint16_t)cmdif->p.glob;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Copies rule @krule from kernel to FreeBSD8 userland format (v0)
|
|
*/
|
|
static void
|
|
export_rule0(struct ip_fw *krule, struct ip_fw_rule0 *urule, int len)
|
|
{
|
|
int cmdlen, l;
|
|
ipfw_insn *cmd;
|
|
ipfw_insn_limit *lcmd;
|
|
ipfw_insn_if *cmdif;
|
|
|
|
/* copy header */
|
|
memset(urule, 0, len);
|
|
urule->act_ofs = krule->act_ofs;
|
|
urule->cmd_len = krule->cmd_len;
|
|
urule->rulenum = krule->rulenum;
|
|
urule->set = krule->set;
|
|
if ((krule->flags & IPFW_RULE_NOOPT) != 0)
|
|
urule->_pad |= 1;
|
|
|
|
/* Copy opcodes */
|
|
memcpy(urule->cmd, krule->cmd, krule->cmd_len * sizeof(uint32_t));
|
|
|
|
/* Export counters */
|
|
export_cntr0_base(krule, (struct ip_fw_bcounter0 *)&urule->pcnt);
|
|
|
|
/*
|
|
* Alter opcodes:
|
|
* 1) convert tablearg value from 0 to 65335
|
|
* 2) Remove highest bit from O_SETFIB/O_SETDSCP values.
|
|
* 3) convert table number in iface opcodes to int
|
|
*/
|
|
l = urule->cmd_len;
|
|
cmd = urule->cmd;
|
|
cmdlen = 0;
|
|
|
|
for ( ; l > 0 ; l -= cmdlen, cmd += cmdlen) {
|
|
cmdlen = F_LEN(cmd);
|
|
|
|
switch (cmd->opcode) {
|
|
/* Opcodes supporting tablearg */
|
|
case O_TAG:
|
|
case O_TAGGED:
|
|
case O_PIPE:
|
|
case O_QUEUE:
|
|
case O_DIVERT:
|
|
case O_TEE:
|
|
case O_SKIPTO:
|
|
case O_CALLRETURN:
|
|
case O_NETGRAPH:
|
|
case O_NGTEE:
|
|
case O_NAT:
|
|
if (cmd->arg1 == IP_FW_TARG)
|
|
cmd->arg1 = 65535;
|
|
break;
|
|
case O_SETFIB:
|
|
case O_SETDSCP:
|
|
if (cmd->arg1 == IP_FW_TARG)
|
|
cmd->arg1 = 65535;
|
|
else
|
|
cmd->arg1 &= ~0x8000;
|
|
break;
|
|
case O_LIMIT:
|
|
lcmd = (ipfw_insn_limit *)cmd;
|
|
if (lcmd->conn_limit == IP_FW_TARG)
|
|
lcmd->conn_limit = 65535;
|
|
break;
|
|
/* Interface tables */
|
|
case O_XMIT:
|
|
case O_RECV:
|
|
case O_VIA:
|
|
/* Interface table, possibly */
|
|
cmdif = (ipfw_insn_if *)cmd;
|
|
if (cmdif->name[0] != '\1')
|
|
break;
|
|
|
|
cmdif->p.glob = cmdif->p.kidx;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Add new rule(s) to the list possibly creating rule number for each.
|
|
* Update the rule_number in the input struct so the caller knows it as well.
|
|
* Must be called without IPFW_UH held
|
|
*/
|
|
static int
|
|
commit_rules(struct ip_fw_chain *chain, struct rule_check_info *rci, int count)
|
|
{
|
|
int error, i, insert_before, tcount;
|
|
uint16_t rulenum, *pnum;
|
|
struct rule_check_info *ci;
|
|
struct ip_fw *krule;
|
|
struct ip_fw **map; /* the new array of pointers */
|
|
|
|
/* Check if we need to do table/obj index remap */
|
|
tcount = 0;
|
|
for (ci = rci, i = 0; i < count; ci++, i++) {
|
|
if (ci->object_opcodes == 0)
|
|
continue;
|
|
|
|
/*
|
|
* Rule has some object opcodes.
|
|
* We need to find (and create non-existing)
|
|
* kernel objects, and reference existing ones.
|
|
*/
|
|
error = rewrite_rule_uidx(chain, ci);
|
|
if (error != 0) {
|
|
|
|
/*
|
|
* rewrite failed, state for current rule
|
|
* has been reverted. Check if we need to
|
|
* revert more.
|
|
*/
|
|
if (tcount > 0) {
|
|
|
|
/*
|
|
* We have some more table rules
|
|
* we need to rollback.
|
|
*/
|
|
|
|
IPFW_UH_WLOCK(chain);
|
|
while (ci != rci) {
|
|
ci--;
|
|
if (ci->object_opcodes == 0)
|
|
continue;
|
|
unref_rule_objects(chain,ci->krule);
|
|
|
|
}
|
|
IPFW_UH_WUNLOCK(chain);
|
|
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
tcount++;
|
|
}
|
|
|
|
/* get_map returns with IPFW_UH_WLOCK if successful */
|
|
map = get_map(chain, count, 0 /* not locked */);
|
|
if (map == NULL) {
|
|
if (tcount > 0) {
|
|
/* Unbind tables */
|
|
IPFW_UH_WLOCK(chain);
|
|
for (ci = rci, i = 0; i < count; ci++, i++) {
|
|
if (ci->object_opcodes == 0)
|
|
continue;
|
|
|
|
unref_rule_objects(chain, ci->krule);
|
|
}
|
|
IPFW_UH_WUNLOCK(chain);
|
|
}
|
|
|
|
return (ENOSPC);
|
|
}
|
|
|
|
if (V_autoinc_step < 1)
|
|
V_autoinc_step = 1;
|
|
else if (V_autoinc_step > 1000)
|
|
V_autoinc_step = 1000;
|
|
|
|
/* FIXME: Handle count > 1 */
|
|
ci = rci;
|
|
krule = ci->krule;
|
|
rulenum = krule->rulenum;
|
|
|
|
/* find the insertion point, we will insert before */
|
|
insert_before = rulenum ? rulenum + 1 : IPFW_DEFAULT_RULE;
|
|
i = ipfw_find_rule(chain, insert_before, 0);
|
|
/* duplicate first part */
|
|
if (i > 0)
|
|
bcopy(chain->map, map, i * sizeof(struct ip_fw *));
|
|
map[i] = krule;
|
|
/* duplicate remaining part, we always have the default rule */
|
|
bcopy(chain->map + i, map + i + 1,
|
|
sizeof(struct ip_fw *) *(chain->n_rules - i));
|
|
if (rulenum == 0) {
|
|
/* Compute rule number and write it back */
|
|
rulenum = i > 0 ? map[i-1]->rulenum : 0;
|
|
if (rulenum < IPFW_DEFAULT_RULE - V_autoinc_step)
|
|
rulenum += V_autoinc_step;
|
|
krule->rulenum = rulenum;
|
|
/* Save number to userland rule */
|
|
pnum = (uint16_t *)((caddr_t)ci->urule + ci->urule_numoff);
|
|
*pnum = rulenum;
|
|
}
|
|
|
|
krule->id = chain->id + 1;
|
|
update_skipto_cache(chain, map);
|
|
map = swap_map(chain, map, chain->n_rules + 1);
|
|
chain->static_len += RULEUSIZE0(krule);
|
|
IPFW_UH_WUNLOCK(chain);
|
|
if (map)
|
|
free(map, M_IPFW);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Adds @rule to the list of rules to reap
|
|
*/
|
|
void
|
|
ipfw_reap_add(struct ip_fw_chain *chain, struct ip_fw **head,
|
|
struct ip_fw *rule)
|
|
{
|
|
|
|
IPFW_UH_WLOCK_ASSERT(chain);
|
|
|
|
/* Unlink rule from everywhere */
|
|
unref_rule_objects(chain, rule);
|
|
|
|
*((struct ip_fw **)rule) = *head;
|
|
*head = rule;
|
|
}
|
|
|
|
/*
|
|
* Reclaim storage associated with a list of rules. This is
|
|
* typically the list created using remove_rule.
|
|
* A NULL pointer on input is handled correctly.
|
|
*/
|
|
void
|
|
ipfw_reap_rules(struct ip_fw *head)
|
|
{
|
|
struct ip_fw *rule;
|
|
|
|
while ((rule = head) != NULL) {
|
|
head = *((struct ip_fw **)head);
|
|
free_rule(rule);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Rules to keep are
|
|
* (default || reserved || !match_set || !match_number)
|
|
* where
|
|
* default ::= (rule->rulenum == IPFW_DEFAULT_RULE)
|
|
* // the default rule is always protected
|
|
*
|
|
* reserved ::= (cmd == 0 && n == 0 && rule->set == RESVD_SET)
|
|
* // RESVD_SET is protected only if cmd == 0 and n == 0 ("ipfw flush")
|
|
*
|
|
* match_set ::= (cmd == 0 || rule->set == set)
|
|
* // set number is ignored for cmd == 0
|
|
*
|
|
* match_number ::= (cmd == 1 || n == 0 || n == rule->rulenum)
|
|
* // number is ignored for cmd == 1 or n == 0
|
|
*
|
|
*/
|
|
int
|
|
ipfw_match_range(struct ip_fw *rule, ipfw_range_tlv *rt)
|
|
{
|
|
|
|
/* Don't match default rule for modification queries */
|
|
if (rule->rulenum == IPFW_DEFAULT_RULE &&
|
|
(rt->flags & IPFW_RCFLAG_DEFAULT) == 0)
|
|
return (0);
|
|
|
|
/* Don't match rules in reserved set for flush requests */
|
|
if ((rt->flags & IPFW_RCFLAG_ALL) != 0 && rule->set == RESVD_SET)
|
|
return (0);
|
|
|
|
/* If we're filtering by set, don't match other sets */
|
|
if ((rt->flags & IPFW_RCFLAG_SET) != 0 && rule->set != rt->set)
|
|
return (0);
|
|
|
|
if ((rt->flags & IPFW_RCFLAG_RANGE) != 0 &&
|
|
(rule->rulenum < rt->start_rule || rule->rulenum > rt->end_rule))
|
|
return (0);
|
|
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Delete rules matching range @rt.
|
|
* Saves number of deleted rules in @ndel.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int
|
|
delete_range(struct ip_fw_chain *chain, ipfw_range_tlv *rt, int *ndel)
|
|
{
|
|
struct ip_fw *reap, *rule, **map;
|
|
int end, start;
|
|
int i, n, ndyn, ofs;
|
|
|
|
reap = NULL;
|
|
IPFW_UH_WLOCK(chain); /* arbitrate writers */
|
|
|
|
/*
|
|
* Stage 1: Determine range to inspect.
|
|
* Range is half-inclusive, e.g [start, end).
|
|
*/
|
|
start = 0;
|
|
end = chain->n_rules - 1;
|
|
|
|
if ((rt->flags & IPFW_RCFLAG_RANGE) != 0) {
|
|
start = ipfw_find_rule(chain, rt->start_rule, 0);
|
|
|
|
end = ipfw_find_rule(chain, rt->end_rule, 0);
|
|
if (rt->end_rule != IPFW_DEFAULT_RULE)
|
|
while (chain->map[end]->rulenum == rt->end_rule)
|
|
end++;
|
|
}
|
|
|
|
/* Allocate new map of the same size */
|
|
map = get_map(chain, 0, 1 /* locked */);
|
|
if (map == NULL) {
|
|
IPFW_UH_WUNLOCK(chain);
|
|
return (ENOMEM);
|
|
}
|
|
|
|
n = 0;
|
|
ndyn = 0;
|
|
ofs = start;
|
|
/* 1. bcopy the initial part of the map */
|
|
if (start > 0)
|
|
bcopy(chain->map, map, start * sizeof(struct ip_fw *));
|
|
/* 2. copy active rules between start and end */
|
|
for (i = start; i < end; i++) {
|
|
rule = chain->map[i];
|
|
if (ipfw_match_range(rule, rt) == 0) {
|
|
map[ofs++] = rule;
|
|
continue;
|
|
}
|
|
|
|
n++;
|
|
if (ipfw_is_dyn_rule(rule) != 0)
|
|
ndyn++;
|
|
}
|
|
/* 3. copy the final part of the map */
|
|
bcopy(chain->map + end, map + ofs,
|
|
(chain->n_rules - end) * sizeof(struct ip_fw *));
|
|
/* 4. recalculate skipto cache */
|
|
update_skipto_cache(chain, map);
|
|
/* 5. swap the maps (under UH_WLOCK + WHLOCK) */
|
|
map = swap_map(chain, map, chain->n_rules - n);
|
|
/* 6. Remove all dynamic states originated by deleted rules */
|
|
if (ndyn > 0)
|
|
ipfw_expire_dyn_rules(chain, rt);
|
|
/* 7. now remove the rules deleted from the old map */
|
|
for (i = start; i < end; i++) {
|
|
rule = map[i];
|
|
if (ipfw_match_range(rule, rt) == 0)
|
|
continue;
|
|
chain->static_len -= RULEUSIZE0(rule);
|
|
ipfw_reap_add(chain, &reap, rule);
|
|
}
|
|
IPFW_UH_WUNLOCK(chain);
|
|
|
|
ipfw_reap_rules(reap);
|
|
if (map != NULL)
|
|
free(map, M_IPFW);
|
|
*ndel = n;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Changes set of given rule rannge @rt
|
|
* with each other.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int
|
|
move_range(struct ip_fw_chain *chain, ipfw_range_tlv *rt)
|
|
{
|
|
struct ip_fw *rule;
|
|
int i;
|
|
|
|
IPFW_UH_WLOCK(chain);
|
|
|
|
/*
|
|
* Move rules with matching paramenerts to a new set.
|
|
* This one is much more complex. We have to ensure
|
|
* that all referenced tables (if any) are referenced
|
|
* by given rule subset only. Otherwise, we can't move
|
|
* them to new set and have to return error.
|
|
*/
|
|
if (V_fw_tables_sets != 0) {
|
|
if (ipfw_move_tables_sets(chain, rt, rt->new_set) != 0) {
|
|
IPFW_UH_WUNLOCK(chain);
|
|
return (EBUSY);
|
|
}
|
|
}
|
|
|
|
/* XXX: We have to do swap holding WLOCK */
|
|
for (i = 0; i < chain->n_rules; i++) {
|
|
rule = chain->map[i];
|
|
if (ipfw_match_range(rule, rt) == 0)
|
|
continue;
|
|
rule->set = rt->new_set;
|
|
}
|
|
|
|
IPFW_UH_WUNLOCK(chain);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Clear counters for a specific rule.
|
|
* Normally run under IPFW_UH_RLOCK, but these are idempotent ops
|
|
* so we only care that rules do not disappear.
|
|
*/
|
|
static void
|
|
clear_counters(struct ip_fw *rule, int log_only)
|
|
{
|
|
ipfw_insn_log *l = (ipfw_insn_log *)ACTION_PTR(rule);
|
|
|
|
if (log_only == 0)
|
|
IPFW_ZERO_RULE_COUNTER(rule);
|
|
if (l->o.opcode == O_LOG)
|
|
l->log_left = l->max_log;
|
|
}
|
|
|
|
/*
|
|
* Flushes rules counters and/or log values on matching range.
|
|
*
|
|
* Returns number of items cleared.
|
|
*/
|
|
static int
|
|
clear_range(struct ip_fw_chain *chain, ipfw_range_tlv *rt, int log_only)
|
|
{
|
|
struct ip_fw *rule;
|
|
int num;
|
|
int i;
|
|
|
|
num = 0;
|
|
rt->flags |= IPFW_RCFLAG_DEFAULT;
|
|
|
|
IPFW_UH_WLOCK(chain); /* arbitrate writers */
|
|
for (i = 0; i < chain->n_rules; i++) {
|
|
rule = chain->map[i];
|
|
if (ipfw_match_range(rule, rt) == 0)
|
|
continue;
|
|
clear_counters(rule, log_only);
|
|
num++;
|
|
}
|
|
IPFW_UH_WUNLOCK(chain);
|
|
|
|
return (num);
|
|
}
|
|
|
|
static int
|
|
check_range_tlv(ipfw_range_tlv *rt)
|
|
{
|
|
|
|
if (rt->head.length != sizeof(*rt))
|
|
return (1);
|
|
if (rt->start_rule > rt->end_rule)
|
|
return (1);
|
|
if (rt->set >= IPFW_MAX_SETS || rt->new_set >= IPFW_MAX_SETS)
|
|
return (1);
|
|
|
|
if ((rt->flags & IPFW_RCFLAG_USER) != rt->flags)
|
|
return (1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Delete rules matching specified parameters
|
|
* Data layout (v0)(current):
|
|
* Request: [ ipfw_obj_header ipfw_range_tlv ]
|
|
* Reply: [ ipfw_obj_header ipfw_range_tlv ]
|
|
*
|
|
* Saves number of deleted rules in ipfw_range_tlv->new_set.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int
|
|
del_rules(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
|
|
struct sockopt_data *sd)
|
|
{
|
|
ipfw_range_header *rh;
|
|
int error, ndel;
|
|
|
|
if (sd->valsize != sizeof(*rh))
|
|
return (EINVAL);
|
|
|
|
rh = (ipfw_range_header *)ipfw_get_sopt_space(sd, sd->valsize);
|
|
|
|
if (check_range_tlv(&rh->range) != 0)
|
|
return (EINVAL);
|
|
|
|
ndel = 0;
|
|
if ((error = delete_range(chain, &rh->range, &ndel)) != 0)
|
|
return (error);
|
|
|
|
/* Save number of rules deleted */
|
|
rh->range.new_set = ndel;
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Move rules/sets matching specified parameters
|
|
* Data layout (v0)(current):
|
|
* Request: [ ipfw_obj_header ipfw_range_tlv ]
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int
|
|
move_rules(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
|
|
struct sockopt_data *sd)
|
|
{
|
|
ipfw_range_header *rh;
|
|
|
|
if (sd->valsize != sizeof(*rh))
|
|
return (EINVAL);
|
|
|
|
rh = (ipfw_range_header *)ipfw_get_sopt_space(sd, sd->valsize);
|
|
|
|
if (check_range_tlv(&rh->range) != 0)
|
|
return (EINVAL);
|
|
|
|
return (move_range(chain, &rh->range));
|
|
}
|
|
|
|
/*
|
|
* Clear rule accounting data matching specified parameters
|
|
* Data layout (v0)(current):
|
|
* Request: [ ipfw_obj_header ipfw_range_tlv ]
|
|
* Reply: [ ipfw_obj_header ipfw_range_tlv ]
|
|
*
|
|
* Saves number of cleared rules in ipfw_range_tlv->new_set.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int
|
|
clear_rules(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
|
|
struct sockopt_data *sd)
|
|
{
|
|
ipfw_range_header *rh;
|
|
int log_only, num;
|
|
char *msg;
|
|
|
|
if (sd->valsize != sizeof(*rh))
|
|
return (EINVAL);
|
|
|
|
rh = (ipfw_range_header *)ipfw_get_sopt_space(sd, sd->valsize);
|
|
|
|
if (check_range_tlv(&rh->range) != 0)
|
|
return (EINVAL);
|
|
|
|
log_only = (op3->opcode == IP_FW_XRESETLOG);
|
|
|
|
num = clear_range(chain, &rh->range, log_only);
|
|
|
|
if (rh->range.flags & IPFW_RCFLAG_ALL)
|
|
msg = log_only ? "All logging counts reset" :
|
|
"Accounting cleared";
|
|
else
|
|
msg = log_only ? "logging count reset" : "cleared";
|
|
|
|
if (V_fw_verbose) {
|
|
int lev = LOG_SECURITY | LOG_NOTICE;
|
|
log(lev, "ipfw: %s.\n", msg);
|
|
}
|
|
|
|
/* Save number of rules cleared */
|
|
rh->range.new_set = num;
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
enable_sets(struct ip_fw_chain *chain, ipfw_range_tlv *rt)
|
|
{
|
|
uint32_t v_set;
|
|
|
|
IPFW_UH_WLOCK_ASSERT(chain);
|
|
|
|
/* Change enabled/disabled sets mask */
|
|
v_set = (V_set_disable | rt->set) & ~rt->new_set;
|
|
v_set &= ~(1 << RESVD_SET); /* set RESVD_SET always enabled */
|
|
IPFW_WLOCK(chain);
|
|
V_set_disable = v_set;
|
|
IPFW_WUNLOCK(chain);
|
|
}
|
|
|
|
static void
|
|
swap_sets(struct ip_fw_chain *chain, ipfw_range_tlv *rt, int mv)
|
|
{
|
|
struct ip_fw *rule;
|
|
int i;
|
|
|
|
IPFW_UH_WLOCK_ASSERT(chain);
|
|
|
|
/* Swap or move two sets */
|
|
for (i = 0; i < chain->n_rules - 1; i++) {
|
|
rule = chain->map[i];
|
|
if (rule->set == rt->set)
|
|
rule->set = rt->new_set;
|
|
else if (rule->set == rt->new_set && mv == 0)
|
|
rule->set = rt->set;
|
|
}
|
|
if (V_fw_tables_sets != 0)
|
|
ipfw_swap_tables_sets(chain, rt->set, rt->new_set, mv);
|
|
}
|
|
|
|
/*
|
|
* Swaps or moves set
|
|
* Data layout (v0)(current):
|
|
* Request: [ ipfw_obj_header ipfw_range_tlv ]
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int
|
|
manage_sets(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
|
|
struct sockopt_data *sd)
|
|
{
|
|
ipfw_range_header *rh;
|
|
|
|
if (sd->valsize != sizeof(*rh))
|
|
return (EINVAL);
|
|
|
|
rh = (ipfw_range_header *)ipfw_get_sopt_space(sd, sd->valsize);
|
|
|
|
if (rh->range.head.length != sizeof(ipfw_range_tlv))
|
|
return (1);
|
|
|
|
IPFW_UH_WLOCK(chain);
|
|
switch (op3->opcode) {
|
|
case IP_FW_SET_SWAP:
|
|
case IP_FW_SET_MOVE:
|
|
swap_sets(chain, &rh->range, op3->opcode == IP_FW_SET_MOVE);
|
|
break;
|
|
case IP_FW_SET_ENABLE:
|
|
enable_sets(chain, &rh->range);
|
|
break;
|
|
}
|
|
IPFW_UH_WUNLOCK(chain);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/**
|
|
* Remove all rules with given number, or do set manipulation.
|
|
* Assumes chain != NULL && *chain != NULL.
|
|
*
|
|
* The argument is an uint32_t. The low 16 bit are the rule or set number;
|
|
* the next 8 bits are the new set; the top 8 bits indicate the command:
|
|
*
|
|
* 0 delete rules numbered "rulenum"
|
|
* 1 delete rules in set "rulenum"
|
|
* 2 move rules "rulenum" to set "new_set"
|
|
* 3 move rules from set "rulenum" to set "new_set"
|
|
* 4 swap sets "rulenum" and "new_set"
|
|
* 5 delete rules "rulenum" and set "new_set"
|
|
*/
|
|
static int
|
|
del_entry(struct ip_fw_chain *chain, uint32_t arg)
|
|
{
|
|
uint32_t num; /* rule number or old_set */
|
|
uint8_t cmd, new_set;
|
|
int do_del, ndel;
|
|
int error = 0;
|
|
ipfw_range_tlv rt;
|
|
|
|
num = arg & 0xffff;
|
|
cmd = (arg >> 24) & 0xff;
|
|
new_set = (arg >> 16) & 0xff;
|
|
|
|
if (cmd > 5 || new_set > RESVD_SET)
|
|
return EINVAL;
|
|
if (cmd == 0 || cmd == 2 || cmd == 5) {
|
|
if (num >= IPFW_DEFAULT_RULE)
|
|
return EINVAL;
|
|
} else {
|
|
if (num > RESVD_SET) /* old_set */
|
|
return EINVAL;
|
|
}
|
|
|
|
/* Convert old requests into new representation */
|
|
memset(&rt, 0, sizeof(rt));
|
|
rt.start_rule = num;
|
|
rt.end_rule = num;
|
|
rt.set = num;
|
|
rt.new_set = new_set;
|
|
do_del = 0;
|
|
|
|
switch (cmd) {
|
|
case 0: /* delete rules numbered "rulenum" */
|
|
if (num == 0)
|
|
rt.flags |= IPFW_RCFLAG_ALL;
|
|
else
|
|
rt.flags |= IPFW_RCFLAG_RANGE;
|
|
do_del = 1;
|
|
break;
|
|
case 1: /* delete rules in set "rulenum" */
|
|
rt.flags |= IPFW_RCFLAG_SET;
|
|
do_del = 1;
|
|
break;
|
|
case 5: /* delete rules "rulenum" and set "new_set" */
|
|
rt.flags |= IPFW_RCFLAG_RANGE | IPFW_RCFLAG_SET;
|
|
rt.set = new_set;
|
|
rt.new_set = 0;
|
|
do_del = 1;
|
|
break;
|
|
case 2: /* move rules "rulenum" to set "new_set" */
|
|
rt.flags |= IPFW_RCFLAG_RANGE;
|
|
break;
|
|
case 3: /* move rules from set "rulenum" to set "new_set" */
|
|
IPFW_UH_WLOCK(chain);
|
|
swap_sets(chain, &rt, 1);
|
|
IPFW_UH_WUNLOCK(chain);
|
|
return (0);
|
|
case 4: /* swap sets "rulenum" and "new_set" */
|
|
IPFW_UH_WLOCK(chain);
|
|
swap_sets(chain, &rt, 0);
|
|
IPFW_UH_WUNLOCK(chain);
|
|
return (0);
|
|
default:
|
|
return (ENOTSUP);
|
|
}
|
|
|
|
if (do_del != 0) {
|
|
if ((error = delete_range(chain, &rt, &ndel)) != 0)
|
|
return (error);
|
|
|
|
if (ndel == 0 && (cmd != 1 && num != 0))
|
|
return (EINVAL);
|
|
|
|
return (0);
|
|
}
|
|
|
|
return (move_range(chain, &rt));
|
|
}
|
|
|
|
/**
|
|
* Reset some or all counters on firewall rules.
|
|
* The argument `arg' is an u_int32_t. The low 16 bit are the rule number,
|
|
* the next 8 bits are the set number, the top 8 bits are the command:
|
|
* 0 work with rules from all set's;
|
|
* 1 work with rules only from specified set.
|
|
* Specified rule number is zero if we want to clear all entries.
|
|
* log_only is 1 if we only want to reset logs, zero otherwise.
|
|
*/
|
|
static int
|
|
zero_entry(struct ip_fw_chain *chain, u_int32_t arg, int log_only)
|
|
{
|
|
struct ip_fw *rule;
|
|
char *msg;
|
|
int i;
|
|
|
|
uint16_t rulenum = arg & 0xffff;
|
|
uint8_t set = (arg >> 16) & 0xff;
|
|
uint8_t cmd = (arg >> 24) & 0xff;
|
|
|
|
if (cmd > 1)
|
|
return (EINVAL);
|
|
if (cmd == 1 && set > RESVD_SET)
|
|
return (EINVAL);
|
|
|
|
IPFW_UH_RLOCK(chain);
|
|
if (rulenum == 0) {
|
|
V_norule_counter = 0;
|
|
for (i = 0; i < chain->n_rules; i++) {
|
|
rule = chain->map[i];
|
|
/* Skip rules not in our set. */
|
|
if (cmd == 1 && rule->set != set)
|
|
continue;
|
|
clear_counters(rule, log_only);
|
|
}
|
|
msg = log_only ? "All logging counts reset" :
|
|
"Accounting cleared";
|
|
} else {
|
|
int cleared = 0;
|
|
for (i = 0; i < chain->n_rules; i++) {
|
|
rule = chain->map[i];
|
|
if (rule->rulenum == rulenum) {
|
|
if (cmd == 0 || rule->set == set)
|
|
clear_counters(rule, log_only);
|
|
cleared = 1;
|
|
}
|
|
if (rule->rulenum > rulenum)
|
|
break;
|
|
}
|
|
if (!cleared) { /* we did not find any matching rules */
|
|
IPFW_UH_RUNLOCK(chain);
|
|
return (EINVAL);
|
|
}
|
|
msg = log_only ? "logging count reset" : "cleared";
|
|
}
|
|
IPFW_UH_RUNLOCK(chain);
|
|
|
|
if (V_fw_verbose) {
|
|
int lev = LOG_SECURITY | LOG_NOTICE;
|
|
|
|
if (rulenum)
|
|
log(lev, "ipfw: Entry %d %s.\n", rulenum, msg);
|
|
else
|
|
log(lev, "ipfw: %s.\n", msg);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Check rule head in FreeBSD11 format
|
|
*
|
|
*/
|
|
static int
|
|
check_ipfw_rule1(struct ip_fw_rule *rule, int size,
|
|
struct rule_check_info *ci)
|
|
{
|
|
int l;
|
|
|
|
if (size < sizeof(*rule)) {
|
|
printf("ipfw: rule too short\n");
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* Check for valid cmd_len */
|
|
l = roundup2(RULESIZE(rule), sizeof(uint64_t));
|
|
if (l != size) {
|
|
printf("ipfw: size mismatch (have %d want %d)\n", size, l);
|
|
return (EINVAL);
|
|
}
|
|
if (rule->act_ofs >= rule->cmd_len) {
|
|
printf("ipfw: bogus action offset (%u > %u)\n",
|
|
rule->act_ofs, rule->cmd_len - 1);
|
|
return (EINVAL);
|
|
}
|
|
|
|
if (rule->rulenum > IPFW_DEFAULT_RULE - 1)
|
|
return (EINVAL);
|
|
|
|
return (check_ipfw_rule_body(rule->cmd, rule->cmd_len, ci));
|
|
}
|
|
|
|
/*
|
|
* Check rule head in FreeBSD8 format
|
|
*
|
|
*/
|
|
static int
|
|
check_ipfw_rule0(struct ip_fw_rule0 *rule, int size,
|
|
struct rule_check_info *ci)
|
|
{
|
|
int l;
|
|
|
|
if (size < sizeof(*rule)) {
|
|
printf("ipfw: rule too short\n");
|
|
return (EINVAL);
|
|
}
|
|
|
|
/* Check for valid cmd_len */
|
|
l = sizeof(*rule) + rule->cmd_len * 4 - 4;
|
|
if (l != size) {
|
|
printf("ipfw: size mismatch (have %d want %d)\n", size, l);
|
|
return (EINVAL);
|
|
}
|
|
if (rule->act_ofs >= rule->cmd_len) {
|
|
printf("ipfw: bogus action offset (%u > %u)\n",
|
|
rule->act_ofs, rule->cmd_len - 1);
|
|
return (EINVAL);
|
|
}
|
|
|
|
if (rule->rulenum > IPFW_DEFAULT_RULE - 1)
|
|
return (EINVAL);
|
|
|
|
return (check_ipfw_rule_body(rule->cmd, rule->cmd_len, ci));
|
|
}
|
|
|
|
static int
|
|
check_ipfw_rule_body(ipfw_insn *cmd, int cmd_len, struct rule_check_info *ci)
|
|
{
|
|
int cmdlen, l;
|
|
int have_action;
|
|
|
|
have_action = 0;
|
|
|
|
/*
|
|
* Now go for the individual checks. Very simple ones, basically only
|
|
* instruction sizes.
|
|
*/
|
|
for (l = cmd_len; l > 0 ; l -= cmdlen, cmd += cmdlen) {
|
|
cmdlen = F_LEN(cmd);
|
|
if (cmdlen > l) {
|
|
printf("ipfw: opcode %d size truncated\n",
|
|
cmd->opcode);
|
|
return EINVAL;
|
|
}
|
|
switch (cmd->opcode) {
|
|
case O_PROBE_STATE:
|
|
case O_KEEP_STATE:
|
|
case O_PROTO:
|
|
case O_IP_SRC_ME:
|
|
case O_IP_DST_ME:
|
|
case O_LAYER2:
|
|
case O_IN:
|
|
case O_FRAG:
|
|
case O_DIVERTED:
|
|
case O_IPOPT:
|
|
case O_IPTOS:
|
|
case O_IPPRECEDENCE:
|
|
case O_IPVER:
|
|
case O_SOCKARG:
|
|
case O_TCPFLAGS:
|
|
case O_TCPOPTS:
|
|
case O_ESTAB:
|
|
case O_VERREVPATH:
|
|
case O_VERSRCREACH:
|
|
case O_ANTISPOOF:
|
|
case O_IPSEC:
|
|
#ifdef INET6
|
|
case O_IP6_SRC_ME:
|
|
case O_IP6_DST_ME:
|
|
case O_EXT_HDR:
|
|
case O_IP6:
|
|
#endif
|
|
case O_IP4:
|
|
case O_TAG:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn))
|
|
goto bad_size;
|
|
break;
|
|
|
|
case O_FIB:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn))
|
|
goto bad_size;
|
|
if (cmd->arg1 >= rt_numfibs) {
|
|
printf("ipfw: invalid fib number %d\n",
|
|
cmd->arg1);
|
|
return EINVAL;
|
|
}
|
|
break;
|
|
|
|
case O_SETFIB:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn))
|
|
goto bad_size;
|
|
if ((cmd->arg1 != IP_FW_TARG) &&
|
|
((cmd->arg1 & 0x7FFF) >= rt_numfibs)) {
|
|
printf("ipfw: invalid fib number %d\n",
|
|
cmd->arg1 & 0x7FFF);
|
|
return EINVAL;
|
|
}
|
|
goto check_action;
|
|
|
|
case O_UID:
|
|
case O_GID:
|
|
case O_JAIL:
|
|
case O_IP_SRC:
|
|
case O_IP_DST:
|
|
case O_TCPSEQ:
|
|
case O_TCPACK:
|
|
case O_PROB:
|
|
case O_ICMPTYPE:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn_u32))
|
|
goto bad_size;
|
|
break;
|
|
|
|
case O_LIMIT:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn_limit))
|
|
goto bad_size;
|
|
break;
|
|
|
|
case O_LOG:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn_log))
|
|
goto bad_size;
|
|
|
|
((ipfw_insn_log *)cmd)->log_left =
|
|
((ipfw_insn_log *)cmd)->max_log;
|
|
|
|
break;
|
|
|
|
case O_IP_SRC_MASK:
|
|
case O_IP_DST_MASK:
|
|
/* only odd command lengths */
|
|
if ((cmdlen & 1) == 0)
|
|
goto bad_size;
|
|
break;
|
|
|
|
case O_IP_SRC_SET:
|
|
case O_IP_DST_SET:
|
|
if (cmd->arg1 == 0 || cmd->arg1 > 256) {
|
|
printf("ipfw: invalid set size %d\n",
|
|
cmd->arg1);
|
|
return EINVAL;
|
|
}
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn_u32) +
|
|
(cmd->arg1+31)/32 )
|
|
goto bad_size;
|
|
break;
|
|
|
|
case O_IP_SRC_LOOKUP:
|
|
case O_IP_DST_LOOKUP:
|
|
if (cmd->arg1 >= V_fw_tables_max) {
|
|
printf("ipfw: invalid table number %d\n",
|
|
cmd->arg1);
|
|
return (EINVAL);
|
|
}
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn) &&
|
|
cmdlen != F_INSN_SIZE(ipfw_insn_u32) + 1 &&
|
|
cmdlen != F_INSN_SIZE(ipfw_insn_u32))
|
|
goto bad_size;
|
|
ci->object_opcodes++;
|
|
break;
|
|
case O_IP_FLOW_LOOKUP:
|
|
if (cmd->arg1 >= V_fw_tables_max) {
|
|
printf("ipfw: invalid table number %d\n",
|
|
cmd->arg1);
|
|
return (EINVAL);
|
|
}
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn) &&
|
|
cmdlen != F_INSN_SIZE(ipfw_insn_u32))
|
|
goto bad_size;
|
|
ci->object_opcodes++;
|
|
break;
|
|
case O_MACADDR2:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn_mac))
|
|
goto bad_size;
|
|
break;
|
|
|
|
case O_NOP:
|
|
case O_IPID:
|
|
case O_IPTTL:
|
|
case O_IPLEN:
|
|
case O_TCPDATALEN:
|
|
case O_TCPWIN:
|
|
case O_TAGGED:
|
|
if (cmdlen < 1 || cmdlen > 31)
|
|
goto bad_size;
|
|
break;
|
|
|
|
case O_DSCP:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn_u32) + 1)
|
|
goto bad_size;
|
|
break;
|
|
|
|
case O_MAC_TYPE:
|
|
case O_IP_SRCPORT:
|
|
case O_IP_DSTPORT: /* XXX artificial limit, 30 port pairs */
|
|
if (cmdlen < 2 || cmdlen > 31)
|
|
goto bad_size;
|
|
break;
|
|
|
|
case O_RECV:
|
|
case O_XMIT:
|
|
case O_VIA:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn_if))
|
|
goto bad_size;
|
|
ci->object_opcodes++;
|
|
break;
|
|
|
|
case O_ALTQ:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn_altq))
|
|
goto bad_size;
|
|
break;
|
|
|
|
case O_PIPE:
|
|
case O_QUEUE:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn))
|
|
goto bad_size;
|
|
goto check_action;
|
|
|
|
case O_FORWARD_IP:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn_sa))
|
|
goto bad_size;
|
|
goto check_action;
|
|
#ifdef INET6
|
|
case O_FORWARD_IP6:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn_sa6))
|
|
goto bad_size;
|
|
goto check_action;
|
|
#endif /* INET6 */
|
|
|
|
case O_DIVERT:
|
|
case O_TEE:
|
|
if (ip_divert_ptr == NULL)
|
|
return EINVAL;
|
|
else
|
|
goto check_size;
|
|
case O_NETGRAPH:
|
|
case O_NGTEE:
|
|
if (ng_ipfw_input_p == NULL)
|
|
return EINVAL;
|
|
else
|
|
goto check_size;
|
|
case O_NAT:
|
|
if (!IPFW_NAT_LOADED)
|
|
return EINVAL;
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn_nat))
|
|
goto bad_size;
|
|
goto check_action;
|
|
case O_FORWARD_MAC: /* XXX not implemented yet */
|
|
case O_CHECK_STATE:
|
|
case O_COUNT:
|
|
case O_ACCEPT:
|
|
case O_DENY:
|
|
case O_REJECT:
|
|
case O_SETDSCP:
|
|
#ifdef INET6
|
|
case O_UNREACH6:
|
|
#endif
|
|
case O_SKIPTO:
|
|
case O_REASS:
|
|
case O_CALLRETURN:
|
|
check_size:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn))
|
|
goto bad_size;
|
|
check_action:
|
|
if (have_action) {
|
|
printf("ipfw: opcode %d, multiple actions"
|
|
" not allowed\n",
|
|
cmd->opcode);
|
|
return (EINVAL);
|
|
}
|
|
have_action = 1;
|
|
if (l != cmdlen) {
|
|
printf("ipfw: opcode %d, action must be"
|
|
" last opcode\n",
|
|
cmd->opcode);
|
|
return (EINVAL);
|
|
}
|
|
break;
|
|
#ifdef INET6
|
|
case O_IP6_SRC:
|
|
case O_IP6_DST:
|
|
if (cmdlen != F_INSN_SIZE(struct in6_addr) +
|
|
F_INSN_SIZE(ipfw_insn))
|
|
goto bad_size;
|
|
break;
|
|
|
|
case O_FLOW6ID:
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn_u32) +
|
|
((ipfw_insn_u32 *)cmd)->o.arg1)
|
|
goto bad_size;
|
|
break;
|
|
|
|
case O_IP6_SRC_MASK:
|
|
case O_IP6_DST_MASK:
|
|
if ( !(cmdlen & 1) || cmdlen > 127)
|
|
goto bad_size;
|
|
break;
|
|
case O_ICMP6TYPE:
|
|
if( cmdlen != F_INSN_SIZE( ipfw_insn_icmp6 ) )
|
|
goto bad_size;
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
switch (cmd->opcode) {
|
|
#ifndef INET6
|
|
case O_IP6_SRC_ME:
|
|
case O_IP6_DST_ME:
|
|
case O_EXT_HDR:
|
|
case O_IP6:
|
|
case O_UNREACH6:
|
|
case O_IP6_SRC:
|
|
case O_IP6_DST:
|
|
case O_FLOW6ID:
|
|
case O_IP6_SRC_MASK:
|
|
case O_IP6_DST_MASK:
|
|
case O_ICMP6TYPE:
|
|
printf("ipfw: no IPv6 support in kernel\n");
|
|
return (EPROTONOSUPPORT);
|
|
#endif
|
|
default:
|
|
printf("ipfw: opcode %d, unknown opcode\n",
|
|
cmd->opcode);
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
}
|
|
if (have_action == 0) {
|
|
printf("ipfw: missing action\n");
|
|
return (EINVAL);
|
|
}
|
|
return 0;
|
|
|
|
bad_size:
|
|
printf("ipfw: opcode %d size %d wrong\n",
|
|
cmd->opcode, cmdlen);
|
|
return (EINVAL);
|
|
}
|
|
|
|
|
|
/*
|
|
* Translation of requests for compatibility with FreeBSD 7.2/8.
|
|
* a static variable tells us if we have an old client from userland,
|
|
* and if necessary we translate requests and responses between the
|
|
* two formats.
|
|
*/
|
|
static int is7 = 0;
|
|
|
|
struct ip_fw7 {
|
|
struct ip_fw7 *next; /* linked list of rules */
|
|
struct ip_fw7 *next_rule; /* ptr to next [skipto] rule */
|
|
/* 'next_rule' is used to pass up 'set_disable' status */
|
|
|
|
uint16_t act_ofs; /* offset of action in 32-bit units */
|
|
uint16_t cmd_len; /* # of 32-bit words in cmd */
|
|
uint16_t rulenum; /* rule number */
|
|
uint8_t set; /* rule set (0..31) */
|
|
// #define RESVD_SET 31 /* set for default and persistent rules */
|
|
uint8_t _pad; /* padding */
|
|
// uint32_t id; /* rule id, only in v.8 */
|
|
/* These fields are present in all rules. */
|
|
uint64_t pcnt; /* Packet counter */
|
|
uint64_t bcnt; /* Byte counter */
|
|
uint32_t timestamp; /* tv_sec of last match */
|
|
|
|
ipfw_insn cmd[1]; /* storage for commands */
|
|
};
|
|
|
|
static int convert_rule_to_7(struct ip_fw_rule0 *rule);
|
|
static int convert_rule_to_8(struct ip_fw_rule0 *rule);
|
|
|
|
#ifndef RULESIZE7
|
|
#define RULESIZE7(rule) (sizeof(struct ip_fw7) + \
|
|
((struct ip_fw7 *)(rule))->cmd_len * 4 - 4)
|
|
#endif
|
|
|
|
|
|
/*
|
|
* Copy the static and dynamic rules to the supplied buffer
|
|
* and return the amount of space actually used.
|
|
* Must be run under IPFW_UH_RLOCK
|
|
*/
|
|
static size_t
|
|
ipfw_getrules(struct ip_fw_chain *chain, void *buf, size_t space)
|
|
{
|
|
char *bp = buf;
|
|
char *ep = bp + space;
|
|
struct ip_fw *rule;
|
|
struct ip_fw_rule0 *dst;
|
|
int error, i, l, warnflag;
|
|
time_t boot_seconds;
|
|
|
|
warnflag = 0;
|
|
|
|
boot_seconds = boottime.tv_sec;
|
|
for (i = 0; i < chain->n_rules; i++) {
|
|
rule = chain->map[i];
|
|
|
|
if (is7) {
|
|
/* Convert rule to FreeBSd 7.2 format */
|
|
l = RULESIZE7(rule);
|
|
if (bp + l + sizeof(uint32_t) <= ep) {
|
|
bcopy(rule, bp, l + sizeof(uint32_t));
|
|
error = set_legacy_obj_kidx(chain,
|
|
(struct ip_fw_rule0 *)bp);
|
|
if (error != 0)
|
|
return (0);
|
|
error = convert_rule_to_7((struct ip_fw_rule0 *) bp);
|
|
if (error)
|
|
return 0; /*XXX correct? */
|
|
/*
|
|
* XXX HACK. Store the disable mask in the "next"
|
|
* pointer in a wild attempt to keep the ABI the same.
|
|
* Why do we do this on EVERY rule?
|
|
*/
|
|
bcopy(&V_set_disable,
|
|
&(((struct ip_fw7 *)bp)->next_rule),
|
|
sizeof(V_set_disable));
|
|
if (((struct ip_fw7 *)bp)->timestamp)
|
|
((struct ip_fw7 *)bp)->timestamp += boot_seconds;
|
|
bp += l;
|
|
}
|
|
continue; /* go to next rule */
|
|
}
|
|
|
|
l = RULEUSIZE0(rule);
|
|
if (bp + l > ep) { /* should not happen */
|
|
printf("overflow dumping static rules\n");
|
|
break;
|
|
}
|
|
dst = (struct ip_fw_rule0 *)bp;
|
|
export_rule0(rule, dst, l);
|
|
error = set_legacy_obj_kidx(chain, dst);
|
|
|
|
/*
|
|
* XXX HACK. Store the disable mask in the "next"
|
|
* pointer in a wild attempt to keep the ABI the same.
|
|
* Why do we do this on EVERY rule?
|
|
*
|
|
* XXX: "ipfw set show" (ab)uses IP_FW_GET to read disabled mask
|
|
* so we need to fail _after_ saving at least one mask.
|
|
*/
|
|
bcopy(&V_set_disable, &dst->next_rule, sizeof(V_set_disable));
|
|
if (dst->timestamp)
|
|
dst->timestamp += boot_seconds;
|
|
bp += l;
|
|
|
|
if (error != 0) {
|
|
if (error == 2) {
|
|
/* Non-fatal table rewrite error. */
|
|
warnflag = 1;
|
|
continue;
|
|
}
|
|
printf("Stop on rule %d. Fail to convert table\n",
|
|
rule->rulenum);
|
|
break;
|
|
}
|
|
}
|
|
if (warnflag != 0)
|
|
printf("ipfw: process %s is using legacy interfaces,"
|
|
" consider rebuilding\n", "");
|
|
ipfw_get_dynamic(chain, &bp, ep); /* protected by the dynamic lock */
|
|
return (bp - (char *)buf);
|
|
}
|
|
|
|
|
|
struct dump_args {
|
|
uint32_t b; /* start rule */
|
|
uint32_t e; /* end rule */
|
|
uint32_t rcount; /* number of rules */
|
|
uint32_t rsize; /* rules size */
|
|
uint32_t tcount; /* number of tables */
|
|
int rcounters; /* counters */
|
|
};
|
|
|
|
void
|
|
ipfw_export_obj_ntlv(struct named_object *no, ipfw_obj_ntlv *ntlv)
|
|
{
|
|
|
|
ntlv->head.type = no->etlv;
|
|
ntlv->head.length = sizeof(*ntlv);
|
|
ntlv->idx = no->kidx;
|
|
strlcpy(ntlv->name, no->name, sizeof(ntlv->name));
|
|
}
|
|
|
|
/*
|
|
* Export named object info in instance @ni, identified by @kidx
|
|
* to ipfw_obj_ntlv. TLV is allocated from @sd space.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int
|
|
export_objhash_ntlv(struct namedobj_instance *ni, uint16_t kidx,
|
|
struct sockopt_data *sd)
|
|
{
|
|
struct named_object *no;
|
|
ipfw_obj_ntlv *ntlv;
|
|
|
|
no = ipfw_objhash_lookup_kidx(ni, kidx);
|
|
KASSERT(no != NULL, ("invalid object kernel index passed"));
|
|
|
|
ntlv = (ipfw_obj_ntlv *)ipfw_get_sopt_space(sd, sizeof(*ntlv));
|
|
if (ntlv == NULL)
|
|
return (ENOMEM);
|
|
|
|
ipfw_export_obj_ntlv(no, ntlv);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Dumps static rules with table TLVs in buffer @sd.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int
|
|
dump_static_rules(struct ip_fw_chain *chain, struct dump_args *da,
|
|
uint32_t *bmask, struct sockopt_data *sd)
|
|
{
|
|
int error;
|
|
int i, l;
|
|
uint32_t tcount;
|
|
ipfw_obj_ctlv *ctlv;
|
|
struct ip_fw *krule;
|
|
struct namedobj_instance *ni;
|
|
caddr_t dst;
|
|
|
|
/* Dump table names first (if any) */
|
|
if (da->tcount > 0) {
|
|
/* Header first */
|
|
ctlv = (ipfw_obj_ctlv *)ipfw_get_sopt_space(sd, sizeof(*ctlv));
|
|
if (ctlv == NULL)
|
|
return (ENOMEM);
|
|
ctlv->head.type = IPFW_TLV_TBLNAME_LIST;
|
|
ctlv->head.length = da->tcount * sizeof(ipfw_obj_ntlv) +
|
|
sizeof(*ctlv);
|
|
ctlv->count = da->tcount;
|
|
ctlv->objsize = sizeof(ipfw_obj_ntlv);
|
|
}
|
|
|
|
i = 0;
|
|
tcount = da->tcount;
|
|
ni = ipfw_get_table_objhash(chain);
|
|
while (tcount > 0) {
|
|
if ((bmask[i / 32] & (1 << (i % 32))) == 0) {
|
|
i++;
|
|
continue;
|
|
}
|
|
|
|
/* Jump to shared named object bitmask */
|
|
if (i >= IPFW_TABLES_MAX) {
|
|
ni = CHAIN_TO_SRV(chain);
|
|
i -= IPFW_TABLES_MAX;
|
|
bmask += IPFW_TABLES_MAX / 32;
|
|
}
|
|
|
|
if ((error = export_objhash_ntlv(ni, i, sd)) != 0)
|
|
return (error);
|
|
|
|
i++;
|
|
tcount--;
|
|
}
|
|
|
|
/* Dump rules */
|
|
ctlv = (ipfw_obj_ctlv *)ipfw_get_sopt_space(sd, sizeof(*ctlv));
|
|
if (ctlv == NULL)
|
|
return (ENOMEM);
|
|
ctlv->head.type = IPFW_TLV_RULE_LIST;
|
|
ctlv->head.length = da->rsize + sizeof(*ctlv);
|
|
ctlv->count = da->rcount;
|
|
|
|
for (i = da->b; i < da->e; i++) {
|
|
krule = chain->map[i];
|
|
|
|
l = RULEUSIZE1(krule) + sizeof(ipfw_obj_tlv);
|
|
if (da->rcounters != 0)
|
|
l += sizeof(struct ip_fw_bcounter);
|
|
dst = (caddr_t)ipfw_get_sopt_space(sd, l);
|
|
if (dst == NULL)
|
|
return (ENOMEM);
|
|
|
|
export_rule1(krule, dst, l, da->rcounters);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Marks every object index used in @rule with bit in @bmask.
|
|
* Used to generate bitmask of referenced tables/objects for given ruleset
|
|
* or its part.
|
|
*
|
|
* Returns number of newly-referenced objects.
|
|
*/
|
|
static int
|
|
mark_object_kidx(struct ip_fw_chain *ch, struct ip_fw *rule,
|
|
uint32_t *bmask)
|
|
{
|
|
struct opcode_obj_rewrite *rw;
|
|
ipfw_insn *cmd;
|
|
int bidx, cmdlen, l, count;
|
|
uint16_t kidx;
|
|
uint8_t subtype;
|
|
|
|
l = rule->cmd_len;
|
|
cmd = rule->cmd;
|
|
cmdlen = 0;
|
|
count = 0;
|
|
for ( ; l > 0 ; l -= cmdlen, cmd += cmdlen) {
|
|
cmdlen = F_LEN(cmd);
|
|
|
|
rw = find_op_rw(cmd, &kidx, &subtype);
|
|
if (rw == NULL)
|
|
continue;
|
|
|
|
bidx = kidx / 32;
|
|
/*
|
|
* Maintain separate bitmasks for table and
|
|
* non-table objects.
|
|
*/
|
|
if (rw->etlv != IPFW_TLV_TBL_NAME)
|
|
bidx += IPFW_TABLES_MAX / 32;
|
|
|
|
if ((bmask[bidx] & (1 << (kidx % 32))) == 0)
|
|
count++;
|
|
|
|
bmask[bidx] |= 1 << (kidx % 32);
|
|
}
|
|
|
|
return (count);
|
|
}
|
|
|
|
/*
|
|
* Dumps requested objects data
|
|
* Data layout (version 0)(current):
|
|
* Request: [ ipfw_cfg_lheader ] + IPFW_CFG_GET_* flags
|
|
* size = ipfw_cfg_lheader.size
|
|
* Reply: [ ipfw_cfg_lheader
|
|
* [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional)
|
|
* [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST)
|
|
* ipfw_obj_tlv(IPFW_TLV_RULE_ENT) [ ip_fw_bcounter (optional) ip_fw_rule ]
|
|
* ] (optional)
|
|
* [ ipfw_obj_ctlv(IPFW_TLV_STATE_LIST) ipfw_obj_dyntlv x N ] (optional)
|
|
* ]
|
|
* * NOTE IPFW_TLV_STATE_LIST has the single valid field: objsize.
|
|
* The rest (size, count) are set to zero and needs to be ignored.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int
|
|
dump_config(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
|
|
struct sockopt_data *sd)
|
|
{
|
|
ipfw_cfg_lheader *hdr;
|
|
struct ip_fw *rule;
|
|
size_t sz, rnum;
|
|
uint32_t hdr_flags;
|
|
int error, i;
|
|
struct dump_args da;
|
|
uint32_t *bmask;
|
|
|
|
hdr = (ipfw_cfg_lheader *)ipfw_get_sopt_header(sd, sizeof(*hdr));
|
|
if (hdr == NULL)
|
|
return (EINVAL);
|
|
|
|
error = 0;
|
|
bmask = NULL;
|
|
/* Allocate needed state. Note we allocate 2xspace mask, for table&srv */
|
|
if (hdr->flags & IPFW_CFG_GET_STATIC)
|
|
bmask = malloc(IPFW_TABLES_MAX / 4, M_TEMP, M_WAITOK | M_ZERO);
|
|
|
|
IPFW_UH_RLOCK(chain);
|
|
|
|
/*
|
|
* STAGE 1: Determine size/count for objects in range.
|
|
* Prepare used tables bitmask.
|
|
*/
|
|
sz = sizeof(ipfw_cfg_lheader);
|
|
memset(&da, 0, sizeof(da));
|
|
|
|
da.b = 0;
|
|
da.e = chain->n_rules;
|
|
|
|
if (hdr->end_rule != 0) {
|
|
/* Handle custom range */
|
|
if ((rnum = hdr->start_rule) > IPFW_DEFAULT_RULE)
|
|
rnum = IPFW_DEFAULT_RULE;
|
|
da.b = ipfw_find_rule(chain, rnum, 0);
|
|
rnum = hdr->end_rule;
|
|
rnum = (rnum < IPFW_DEFAULT_RULE) ? rnum+1 : IPFW_DEFAULT_RULE;
|
|
da.e = ipfw_find_rule(chain, rnum, 0) + 1;
|
|
}
|
|
|
|
if (hdr->flags & IPFW_CFG_GET_STATIC) {
|
|
for (i = da.b; i < da.e; i++) {
|
|
rule = chain->map[i];
|
|
da.rsize += RULEUSIZE1(rule) + sizeof(ipfw_obj_tlv);
|
|
da.rcount++;
|
|
/* Update bitmask of used objects for given range */
|
|
da.tcount += mark_object_kidx(chain, rule, bmask);
|
|
}
|
|
/* Add counters if requested */
|
|
if (hdr->flags & IPFW_CFG_GET_COUNTERS) {
|
|
da.rsize += sizeof(struct ip_fw_bcounter) * da.rcount;
|
|
da.rcounters = 1;
|
|
}
|
|
|
|
if (da.tcount > 0)
|
|
sz += da.tcount * sizeof(ipfw_obj_ntlv) +
|
|
sizeof(ipfw_obj_ctlv);
|
|
sz += da.rsize + sizeof(ipfw_obj_ctlv);
|
|
}
|
|
|
|
if (hdr->flags & IPFW_CFG_GET_STATES)
|
|
sz += ipfw_dyn_get_count() * sizeof(ipfw_obj_dyntlv) +
|
|
sizeof(ipfw_obj_ctlv);
|
|
|
|
|
|
/*
|
|
* Fill header anyway.
|
|
* Note we have to save header fields to stable storage
|
|
* buffer inside @sd can be flushed after dumping rules
|
|
*/
|
|
hdr->size = sz;
|
|
hdr->set_mask = ~V_set_disable;
|
|
hdr_flags = hdr->flags;
|
|
hdr = NULL;
|
|
|
|
if (sd->valsize < sz) {
|
|
error = ENOMEM;
|
|
goto cleanup;
|
|
}
|
|
|
|
/* STAGE2: Store actual data */
|
|
if (hdr_flags & IPFW_CFG_GET_STATIC) {
|
|
error = dump_static_rules(chain, &da, bmask, sd);
|
|
if (error != 0)
|
|
goto cleanup;
|
|
}
|
|
|
|
if (hdr_flags & IPFW_CFG_GET_STATES)
|
|
error = ipfw_dump_states(chain, sd);
|
|
|
|
cleanup:
|
|
IPFW_UH_RUNLOCK(chain);
|
|
|
|
if (bmask != NULL)
|
|
free(bmask, M_TEMP);
|
|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
ipfw_check_object_name_generic(const char *name)
|
|
{
|
|
int nsize;
|
|
|
|
nsize = sizeof(((ipfw_obj_ntlv *)0)->name);
|
|
if (strnlen(name, nsize) == nsize)
|
|
return (EINVAL);
|
|
if (name[0] == '\0')
|
|
return (EINVAL);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Creates non-existent objects referenced by rule.
|
|
*
|
|
* Return 0 on success.
|
|
*/
|
|
int
|
|
create_objects_compat(struct ip_fw_chain *ch, ipfw_insn *cmd,
|
|
struct obj_idx *oib, struct obj_idx *pidx, struct tid_info *ti)
|
|
{
|
|
struct opcode_obj_rewrite *rw;
|
|
struct obj_idx *p;
|
|
uint16_t kidx;
|
|
int error;
|
|
|
|
/*
|
|
* Compatibility stuff: do actual creation for non-existing,
|
|
* but referenced objects.
|
|
*/
|
|
for (p = oib; p < pidx; p++) {
|
|
if (p->kidx != 0)
|
|
continue;
|
|
|
|
ti->uidx = p->uidx;
|
|
ti->type = p->type;
|
|
ti->atype = 0;
|
|
|
|
rw = find_op_rw(cmd + p->off, NULL, NULL);
|
|
KASSERT(rw != NULL, ("Unable to find handler for op %d",
|
|
(cmd + p->off)->opcode));
|
|
|
|
error = rw->create_object(ch, ti, &kidx);
|
|
if (error == 0) {
|
|
p->kidx = kidx;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Error happened. We have to rollback everything.
|
|
* Drop all already acquired references.
|
|
*/
|
|
IPFW_UH_WLOCK(ch);
|
|
unref_oib_objects(ch, cmd, oib, pidx);
|
|
IPFW_UH_WUNLOCK(ch);
|
|
|
|
return (error);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Compatibility function for old ipfw(8) binaries.
|
|
* Rewrites table/nat kernel indices with userland ones.
|
|
* Convert tables matching '/^\d+$/' to their atoi() value.
|
|
* Use number 65535 for other tables.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int
|
|
set_legacy_obj_kidx(struct ip_fw_chain *ch, struct ip_fw_rule0 *rule)
|
|
{
|
|
struct opcode_obj_rewrite *rw;
|
|
struct named_object *no;
|
|
ipfw_insn *cmd;
|
|
char *end;
|
|
long val;
|
|
int cmdlen, error, l;
|
|
uint16_t kidx, uidx;
|
|
uint8_t subtype;
|
|
|
|
error = 0;
|
|
|
|
l = rule->cmd_len;
|
|
cmd = rule->cmd;
|
|
cmdlen = 0;
|
|
for ( ; l > 0 ; l -= cmdlen, cmd += cmdlen) {
|
|
cmdlen = F_LEN(cmd);
|
|
|
|
/* Check if is index in given opcode */
|
|
rw = find_op_rw(cmd, &kidx, &subtype);
|
|
if (rw == NULL)
|
|
continue;
|
|
|
|
/* Try to find referenced kernel object */
|
|
no = rw->find_bykidx(ch, kidx);
|
|
if (no == NULL)
|
|
continue;
|
|
|
|
val = strtol(no->name, &end, 10);
|
|
if (*end == '\0' && val < 65535) {
|
|
uidx = val;
|
|
} else {
|
|
|
|
/*
|
|
* We are called via legacy opcode.
|
|
* Save error and show table as fake number
|
|
* not to make ipfw(8) hang.
|
|
*/
|
|
uidx = 65535;
|
|
error = 2;
|
|
}
|
|
|
|
rw->update(cmd, uidx);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
|
|
/*
|
|
* Unreferences all already-referenced objects in given @cmd rule,
|
|
* using information in @oib.
|
|
*
|
|
* Used to rollback partially converted rule on error.
|
|
*/
|
|
static void
|
|
unref_oib_objects(struct ip_fw_chain *ch, ipfw_insn *cmd, struct obj_idx *oib,
|
|
struct obj_idx *end)
|
|
{
|
|
struct opcode_obj_rewrite *rw;
|
|
struct named_object *no;
|
|
struct obj_idx *p;
|
|
|
|
IPFW_UH_WLOCK_ASSERT(ch);
|
|
|
|
for (p = oib; p < end; p++) {
|
|
if (p->kidx == 0)
|
|
continue;
|
|
|
|
rw = find_op_rw(cmd + p->off, NULL, NULL);
|
|
KASSERT(rw != NULL, ("Unable to find handler for op %d",
|
|
(cmd + p->off)->opcode));
|
|
|
|
/* Find & unref by existing idx */
|
|
no = rw->find_bykidx(ch, p->kidx);
|
|
KASSERT(no != NULL, ("Ref'd object %d disappeared", p->kidx));
|
|
no->refcnt--;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Remove references from every object used in @rule.
|
|
* Used at rule removal code.
|
|
*/
|
|
static void
|
|
unref_rule_objects(struct ip_fw_chain *ch, struct ip_fw *rule)
|
|
{
|
|
struct opcode_obj_rewrite *rw;
|
|
struct named_object *no;
|
|
ipfw_insn *cmd;
|
|
int cmdlen, l;
|
|
uint16_t kidx;
|
|
uint8_t subtype;
|
|
|
|
IPFW_UH_WLOCK_ASSERT(ch);
|
|
|
|
l = rule->cmd_len;
|
|
cmd = rule->cmd;
|
|
cmdlen = 0;
|
|
for ( ; l > 0 ; l -= cmdlen, cmd += cmdlen) {
|
|
cmdlen = F_LEN(cmd);
|
|
|
|
rw = find_op_rw(cmd, &kidx, &subtype);
|
|
if (rw == NULL)
|
|
continue;
|
|
no = rw->find_bykidx(ch, kidx);
|
|
|
|
KASSERT(no != NULL, ("table id %d not found", kidx));
|
|
KASSERT(no->subtype == subtype,
|
|
("wrong type %d (%d) for table id %d",
|
|
no->subtype, subtype, kidx));
|
|
KASSERT(no->refcnt > 0, ("refcount for table %d is %d",
|
|
kidx, no->refcnt));
|
|
|
|
if (no->refcnt == 1 && rw->destroy_object != NULL)
|
|
rw->destroy_object(ch, no);
|
|
else
|
|
no->refcnt--;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Find and reference object (if any) stored in instruction @cmd.
|
|
*
|
|
* Saves object info in @pidx, sets
|
|
* - @unresolved to 1 if object should exists but not found
|
|
*
|
|
* Returns non-zero value in case of error.
|
|
*/
|
|
static int
|
|
ref_opcode_object(struct ip_fw_chain *ch, ipfw_insn *cmd, struct tid_info *ti,
|
|
struct obj_idx *pidx, int *unresolved)
|
|
{
|
|
struct named_object *no;
|
|
struct opcode_obj_rewrite *rw;
|
|
int error;
|
|
|
|
/* Check if this opcode is candidate for rewrite */
|
|
rw = find_op_rw(cmd, &ti->uidx, &ti->type);
|
|
if (rw == NULL)
|
|
return (0);
|
|
|
|
/* Need to rewrite. Save necessary fields */
|
|
pidx->uidx = ti->uidx;
|
|
pidx->type = ti->type;
|
|
|
|
/* Try to find referenced kernel object */
|
|
error = rw->find_byname(ch, ti, &no);
|
|
if (error != 0)
|
|
return (error);
|
|
if (no == NULL) {
|
|
/*
|
|
* Report about unresolved object for automaic
|
|
* creation.
|
|
*/
|
|
*unresolved = 1;
|
|
return (0);
|
|
}
|
|
|
|
/* Found. Bump refcount and update kidx. */
|
|
no->refcnt++;
|
|
rw->update(cmd, no->kidx);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Finds and bumps refcount for objects referenced by given @rule.
|
|
* Auto-creates non-existing tables.
|
|
* Fills in @oib array with userland/kernel indexes.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int
|
|
ref_rule_objects(struct ip_fw_chain *ch, struct ip_fw *rule,
|
|
struct rule_check_info *ci, struct obj_idx *oib, struct tid_info *ti)
|
|
{
|
|
struct obj_idx *pidx;
|
|
ipfw_insn *cmd;
|
|
int cmdlen, error, l, unresolved;
|
|
|
|
pidx = oib;
|
|
l = rule->cmd_len;
|
|
cmd = rule->cmd;
|
|
cmdlen = 0;
|
|
error = 0;
|
|
|
|
IPFW_UH_WLOCK(ch);
|
|
|
|
/* Increase refcount on each existing referenced table. */
|
|
for ( ; l > 0 ; l -= cmdlen, cmd += cmdlen) {
|
|
cmdlen = F_LEN(cmd);
|
|
unresolved = 0;
|
|
|
|
error = ref_opcode_object(ch, cmd, ti, pidx, &unresolved);
|
|
if (error != 0)
|
|
break;
|
|
/*
|
|
* Compability stuff for old clients:
|
|
* prepare to automaitcally create non-existing objects.
|
|
*/
|
|
if (unresolved != 0) {
|
|
pidx->off = rule->cmd_len - l;
|
|
pidx++;
|
|
}
|
|
}
|
|
|
|
if (error != 0) {
|
|
/* Unref everything we have already done */
|
|
unref_oib_objects(ch, rule->cmd, oib, pidx);
|
|
IPFW_UH_WUNLOCK(ch);
|
|
return (error);
|
|
}
|
|
IPFW_UH_WUNLOCK(ch);
|
|
|
|
/* Perform auto-creation for non-existing objects */
|
|
if (pidx != oib)
|
|
error = create_objects_compat(ch, rule->cmd, oib, pidx, ti);
|
|
|
|
/* Calculate real number of dynamic objects */
|
|
ci->object_opcodes = (uint16_t)(pidx - oib);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Checks is opcode is referencing table of appropriate type.
|
|
* Adds reference count for found table if true.
|
|
* Rewrites user-supplied opcode values with kernel ones.
|
|
*
|
|
* Returns 0 on success and appropriate error code otherwise.
|
|
*/
|
|
static int
|
|
rewrite_rule_uidx(struct ip_fw_chain *chain, struct rule_check_info *ci)
|
|
{
|
|
int error;
|
|
ipfw_insn *cmd;
|
|
uint8_t type;
|
|
struct obj_idx *p, *pidx_first, *pidx_last;
|
|
struct tid_info ti;
|
|
|
|
/*
|
|
* Prepare an array for storing opcode indices.
|
|
* Use stack allocation by default.
|
|
*/
|
|
if (ci->object_opcodes <= (sizeof(ci->obuf)/sizeof(ci->obuf[0]))) {
|
|
/* Stack */
|
|
pidx_first = ci->obuf;
|
|
} else
|
|
pidx_first = malloc(
|
|
ci->object_opcodes * sizeof(struct obj_idx),
|
|
M_IPFW, M_WAITOK | M_ZERO);
|
|
|
|
error = 0;
|
|
type = 0;
|
|
memset(&ti, 0, sizeof(ti));
|
|
|
|
/*
|
|
* Use default set for looking up tables (old way) or
|
|
* use set rule is assigned to (new way).
|
|
*/
|
|
ti.set = (V_fw_tables_sets != 0) ? ci->krule->set : 0;
|
|
if (ci->ctlv != NULL) {
|
|
ti.tlvs = (void *)(ci->ctlv + 1);
|
|
ti.tlen = ci->ctlv->head.length - sizeof(ipfw_obj_ctlv);
|
|
}
|
|
|
|
/* Reference all used tables and other objects */
|
|
error = ref_rule_objects(chain, ci->krule, ci, pidx_first, &ti);
|
|
if (error != 0)
|
|
goto free;
|
|
/*
|
|
* Note that ref_rule_objects() might have updated ci->object_opcodes
|
|
* to reflect actual number of object opcodes.
|
|
*/
|
|
|
|
/* Perform rewrite of remaining opcodes */
|
|
p = pidx_first;
|
|
pidx_last = pidx_first + ci->object_opcodes;
|
|
for (p = pidx_first; p < pidx_last; p++) {
|
|
cmd = ci->krule->cmd + p->off;
|
|
update_opcode_kidx(cmd, p->kidx);
|
|
}
|
|
|
|
free:
|
|
if (pidx_first != ci->obuf)
|
|
free(pidx_first, M_IPFW);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Adds one or more rules to ipfw @chain.
|
|
* Data layout (version 0)(current):
|
|
* Request:
|
|
* [
|
|
* ip_fw3_opheader
|
|
* [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional *1)
|
|
* [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) ip_fw x N ] (*2) (*3)
|
|
* ]
|
|
* Reply:
|
|
* [
|
|
* ip_fw3_opheader
|
|
* [ ipfw_obj_ctlv(IPFW_TLV_TBL_LIST) ipfw_obj_ntlv x N ] (optional)
|
|
* [ ipfw_obj_ctlv(IPFW_TLV_RULE_LIST) ip_fw x N ]
|
|
* ]
|
|
*
|
|
* Rules in reply are modified to store their actual ruleset number.
|
|
*
|
|
* (*1) TLVs inside IPFW_TLV_TBL_LIST needs to be sorted ascending
|
|
* accoring to their idx field and there has to be no duplicates.
|
|
* (*2) Numbered rules inside IPFW_TLV_RULE_LIST needs to be sorted ascending.
|
|
* (*3) Each ip_fw structure needs to be aligned to u64 boundary.
|
|
*
|
|
* Returns 0 on success.
|
|
*/
|
|
static int
|
|
add_rules(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
|
|
struct sockopt_data *sd)
|
|
{
|
|
ipfw_obj_ctlv *ctlv, *rtlv, *tstate;
|
|
ipfw_obj_ntlv *ntlv;
|
|
int clen, error, idx;
|
|
uint32_t count, read;
|
|
struct ip_fw_rule *r;
|
|
struct rule_check_info rci, *ci, *cbuf;
|
|
int i, rsize;
|
|
|
|
op3 = (ip_fw3_opheader *)ipfw_get_sopt_space(sd, sd->valsize);
|
|
ctlv = (ipfw_obj_ctlv *)(op3 + 1);
|
|
|
|
read = sizeof(ip_fw3_opheader);
|
|
rtlv = NULL;
|
|
tstate = NULL;
|
|
cbuf = NULL;
|
|
memset(&rci, 0, sizeof(struct rule_check_info));
|
|
|
|
if (read + sizeof(*ctlv) > sd->valsize)
|
|
return (EINVAL);
|
|
|
|
if (ctlv->head.type == IPFW_TLV_TBLNAME_LIST) {
|
|
clen = ctlv->head.length;
|
|
/* Check size and alignment */
|
|
if (clen > sd->valsize || clen < sizeof(*ctlv))
|
|
return (EINVAL);
|
|
if ((clen % sizeof(uint64_t)) != 0)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Some table names or other named objects.
|
|
* Check for validness.
|
|
*/
|
|
count = (ctlv->head.length - sizeof(*ctlv)) / sizeof(*ntlv);
|
|
if (ctlv->count != count || ctlv->objsize != sizeof(*ntlv))
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* Check each TLV.
|
|
* Ensure TLVs are sorted ascending and
|
|
* there are no duplicates.
|
|
*/
|
|
idx = -1;
|
|
ntlv = (ipfw_obj_ntlv *)(ctlv + 1);
|
|
while (count > 0) {
|
|
if (ntlv->head.length != sizeof(ipfw_obj_ntlv))
|
|
return (EINVAL);
|
|
|
|
error = ipfw_check_object_name_generic(ntlv->name);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if (ntlv->idx <= idx)
|
|
return (EINVAL);
|
|
|
|
idx = ntlv->idx;
|
|
count--;
|
|
ntlv++;
|
|
}
|
|
|
|
tstate = ctlv;
|
|
read += ctlv->head.length;
|
|
ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length);
|
|
}
|
|
|
|
if (read + sizeof(*ctlv) > sd->valsize)
|
|
return (EINVAL);
|
|
|
|
if (ctlv->head.type == IPFW_TLV_RULE_LIST) {
|
|
clen = ctlv->head.length;
|
|
if (clen + read > sd->valsize || clen < sizeof(*ctlv))
|
|
return (EINVAL);
|
|
if ((clen % sizeof(uint64_t)) != 0)
|
|
return (EINVAL);
|
|
|
|
/*
|
|
* TODO: Permit adding multiple rules at once
|
|
*/
|
|
if (ctlv->count != 1)
|
|
return (ENOTSUP);
|
|
|
|
clen -= sizeof(*ctlv);
|
|
|
|
if (ctlv->count > clen / sizeof(struct ip_fw_rule))
|
|
return (EINVAL);
|
|
|
|
/* Allocate state for each rule or use stack */
|
|
if (ctlv->count == 1) {
|
|
memset(&rci, 0, sizeof(struct rule_check_info));
|
|
cbuf = &rci;
|
|
} else
|
|
cbuf = malloc(ctlv->count * sizeof(*ci), M_TEMP,
|
|
M_WAITOK | M_ZERO);
|
|
ci = cbuf;
|
|
|
|
/*
|
|
* Check each rule for validness.
|
|
* Ensure numbered rules are sorted ascending
|
|
* and properly aligned
|
|
*/
|
|
idx = 0;
|
|
r = (struct ip_fw_rule *)(ctlv + 1);
|
|
count = 0;
|
|
error = 0;
|
|
while (clen > 0) {
|
|
rsize = roundup2(RULESIZE(r), sizeof(uint64_t));
|
|
if (rsize > clen || ctlv->count <= count) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
|
|
ci->ctlv = tstate;
|
|
error = check_ipfw_rule1(r, rsize, ci);
|
|
if (error != 0)
|
|
break;
|
|
|
|
/* Check sorting */
|
|
if (r->rulenum != 0 && r->rulenum < idx) {
|
|
printf("rulenum %d idx %d\n", r->rulenum, idx);
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
idx = r->rulenum;
|
|
|
|
ci->urule = (caddr_t)r;
|
|
|
|
rsize = roundup2(rsize, sizeof(uint64_t));
|
|
clen -= rsize;
|
|
r = (struct ip_fw_rule *)((caddr_t)r + rsize);
|
|
count++;
|
|
ci++;
|
|
}
|
|
|
|
if (ctlv->count != count || error != 0) {
|
|
if (cbuf != &rci)
|
|
free(cbuf, M_TEMP);
|
|
return (EINVAL);
|
|
}
|
|
|
|
rtlv = ctlv;
|
|
read += ctlv->head.length;
|
|
ctlv = (ipfw_obj_ctlv *)((caddr_t)ctlv + ctlv->head.length);
|
|
}
|
|
|
|
if (read != sd->valsize || rtlv == NULL || rtlv->count == 0) {
|
|
if (cbuf != NULL && cbuf != &rci)
|
|
free(cbuf, M_TEMP);
|
|
return (EINVAL);
|
|
}
|
|
|
|
/*
|
|
* Passed rules seems to be valid.
|
|
* Allocate storage and try to add them to chain.
|
|
*/
|
|
for (i = 0, ci = cbuf; i < rtlv->count; i++, ci++) {
|
|
clen = RULEKSIZE1((struct ip_fw_rule *)ci->urule);
|
|
ci->krule = ipfw_alloc_rule(chain, clen);
|
|
import_rule1(ci);
|
|
}
|
|
|
|
if ((error = commit_rules(chain, cbuf, rtlv->count)) != 0) {
|
|
/* Free allocate krules */
|
|
for (i = 0, ci = cbuf; i < rtlv->count; i++, ci++)
|
|
free(ci->krule, M_IPFW);
|
|
}
|
|
|
|
if (cbuf != NULL && cbuf != &rci)
|
|
free(cbuf, M_TEMP);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Lists all sopts currently registered.
|
|
* Data layout (v0)(current):
|
|
* Request: [ ipfw_obj_lheader ], size = ipfw_obj_lheader.size
|
|
* Reply: [ ipfw_obj_lheader ipfw_sopt_info x N ]
|
|
*
|
|
* Returns 0 on success
|
|
*/
|
|
static int
|
|
dump_soptcodes(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
|
|
struct sockopt_data *sd)
|
|
{
|
|
struct _ipfw_obj_lheader *olh;
|
|
ipfw_sopt_info *i;
|
|
struct ipfw_sopt_handler *sh;
|
|
uint32_t count, n, size;
|
|
|
|
olh = (struct _ipfw_obj_lheader *)ipfw_get_sopt_header(sd,sizeof(*olh));
|
|
if (olh == NULL)
|
|
return (EINVAL);
|
|
if (sd->valsize < olh->size)
|
|
return (EINVAL);
|
|
|
|
CTL3_LOCK();
|
|
count = ctl3_hsize;
|
|
size = count * sizeof(ipfw_sopt_info) + sizeof(ipfw_obj_lheader);
|
|
|
|
/* Fill in header regadless of buffer size */
|
|
olh->count = count;
|
|
olh->objsize = sizeof(ipfw_sopt_info);
|
|
|
|
if (size > olh->size) {
|
|
olh->size = size;
|
|
CTL3_UNLOCK();
|
|
return (ENOMEM);
|
|
}
|
|
olh->size = size;
|
|
|
|
for (n = 1; n <= count; n++) {
|
|
i = (ipfw_sopt_info *)ipfw_get_sopt_space(sd, sizeof(*i));
|
|
KASSERT(i != 0, ("previously checked buffer is not enough"));
|
|
sh = &ctl3_handlers[n];
|
|
i->opcode = sh->opcode;
|
|
i->version = sh->version;
|
|
i->refcnt = sh->refcnt;
|
|
}
|
|
CTL3_UNLOCK();
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Compares two opcodes.
|
|
* Used both in qsort() and bsearch().
|
|
*
|
|
* Returns 0 if match is found.
|
|
*/
|
|
static int
|
|
compare_opcodes(const void *_a, const void *_b)
|
|
{
|
|
const struct opcode_obj_rewrite *a, *b;
|
|
|
|
a = (const struct opcode_obj_rewrite *)_a;
|
|
b = (const struct opcode_obj_rewrite *)_b;
|
|
|
|
if (a->opcode < b->opcode)
|
|
return (-1);
|
|
else if (a->opcode > b->opcode)
|
|
return (1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* XXX: Rewrite bsearch()
|
|
*/
|
|
static int
|
|
find_op_rw_range(uint16_t op, struct opcode_obj_rewrite **plo,
|
|
struct opcode_obj_rewrite **phi)
|
|
{
|
|
struct opcode_obj_rewrite *ctl3_max, *lo, *hi, h, *rw;
|
|
|
|
memset(&h, 0, sizeof(h));
|
|
h.opcode = op;
|
|
|
|
rw = (struct opcode_obj_rewrite *)bsearch(&h, ctl3_rewriters,
|
|
ctl3_rsize, sizeof(h), compare_opcodes);
|
|
if (rw == NULL)
|
|
return (1);
|
|
|
|
/* Find the first element matching the same opcode */
|
|
lo = rw;
|
|
for ( ; lo > ctl3_rewriters && (lo - 1)->opcode == op; lo--)
|
|
;
|
|
|
|
/* Find the last element matching the same opcode */
|
|
hi = rw;
|
|
ctl3_max = ctl3_rewriters + ctl3_rsize;
|
|
for ( ; (hi + 1) < ctl3_max && (hi + 1)->opcode == op; hi++)
|
|
;
|
|
|
|
*plo = lo;
|
|
*phi = hi;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Finds opcode object rewriter based on @code.
|
|
*
|
|
* Returns pointer to handler or NULL.
|
|
*/
|
|
static struct opcode_obj_rewrite *
|
|
find_op_rw(ipfw_insn *cmd, uint16_t *puidx, uint8_t *ptype)
|
|
{
|
|
struct opcode_obj_rewrite *rw, *lo, *hi;
|
|
uint16_t uidx;
|
|
uint8_t subtype;
|
|
|
|
if (find_op_rw_range(cmd->opcode, &lo, &hi) != 0)
|
|
return (NULL);
|
|
|
|
for (rw = lo; rw <= hi; rw++) {
|
|
if (rw->classifier(cmd, &uidx, &subtype) == 0) {
|
|
if (puidx != NULL)
|
|
*puidx = uidx;
|
|
if (ptype != NULL)
|
|
*ptype = subtype;
|
|
return (rw);
|
|
}
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
int
|
|
classify_opcode_kidx(ipfw_insn *cmd, uint16_t *puidx)
|
|
{
|
|
|
|
if (find_op_rw(cmd, puidx, NULL) == 0)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
update_opcode_kidx(ipfw_insn *cmd, uint16_t idx)
|
|
{
|
|
struct opcode_obj_rewrite *rw;
|
|
|
|
rw = find_op_rw(cmd, NULL, NULL);
|
|
KASSERT(rw != NULL, ("No handler to update opcode %d", cmd->opcode));
|
|
rw->update(cmd, idx);
|
|
}
|
|
|
|
void
|
|
ipfw_init_obj_rewriter()
|
|
{
|
|
|
|
ctl3_rewriters = NULL;
|
|
ctl3_rsize = 0;
|
|
}
|
|
|
|
void
|
|
ipfw_destroy_obj_rewriter()
|
|
{
|
|
|
|
if (ctl3_rewriters != NULL)
|
|
free(ctl3_rewriters, M_IPFW);
|
|
ctl3_rewriters = NULL;
|
|
ctl3_rsize = 0;
|
|
}
|
|
|
|
/*
|
|
* Adds one or more opcode object rewrite handlers to the global array.
|
|
* Function may sleep.
|
|
*/
|
|
void
|
|
ipfw_add_obj_rewriter(struct opcode_obj_rewrite *rw, size_t count)
|
|
{
|
|
size_t sz;
|
|
struct opcode_obj_rewrite *tmp;
|
|
|
|
CTL3_LOCK();
|
|
|
|
for (;;) {
|
|
sz = ctl3_rsize + count;
|
|
CTL3_UNLOCK();
|
|
tmp = malloc(sizeof(*rw) * sz, M_IPFW, M_WAITOK | M_ZERO);
|
|
CTL3_LOCK();
|
|
if (ctl3_rsize + count <= sz)
|
|
break;
|
|
|
|
/* Retry */
|
|
free(tmp, M_IPFW);
|
|
}
|
|
|
|
/* Merge old & new arrays */
|
|
sz = ctl3_rsize + count;
|
|
memcpy(tmp, ctl3_rewriters, ctl3_rsize * sizeof(*rw));
|
|
memcpy(&tmp[ctl3_rsize], rw, count * sizeof(*rw));
|
|
qsort(tmp, sz, sizeof(*rw), compare_opcodes);
|
|
/* Switch new and free old */
|
|
if (ctl3_rewriters != NULL)
|
|
free(ctl3_rewriters, M_IPFW);
|
|
ctl3_rewriters = tmp;
|
|
ctl3_rsize = sz;
|
|
|
|
CTL3_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* Removes one or more object rewrite handlers from the global array.
|
|
*/
|
|
int
|
|
ipfw_del_obj_rewriter(struct opcode_obj_rewrite *rw, size_t count)
|
|
{
|
|
size_t sz;
|
|
struct opcode_obj_rewrite *ctl3_max, *ktmp, *lo, *hi;
|
|
int i;
|
|
|
|
CTL3_LOCK();
|
|
|
|
for (i = 0; i < count; i++) {
|
|
if (find_op_rw_range(rw[i].opcode, &lo, &hi) != 0)
|
|
continue;
|
|
|
|
for (ktmp = lo; ktmp <= hi; ktmp++) {
|
|
if (ktmp->classifier != rw[i].classifier)
|
|
continue;
|
|
|
|
ctl3_max = ctl3_rewriters + ctl3_rsize;
|
|
sz = (ctl3_max - (ktmp + 1)) * sizeof(*ktmp);
|
|
memmove(ktmp, ktmp + 1, sz);
|
|
ctl3_rsize--;
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
if (ctl3_rsize == 0) {
|
|
if (ctl3_rewriters != NULL)
|
|
free(ctl3_rewriters, M_IPFW);
|
|
ctl3_rewriters = NULL;
|
|
}
|
|
|
|
CTL3_UNLOCK();
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
export_objhash_ntlv_internal(struct namedobj_instance *ni,
|
|
struct named_object *no, void *arg)
|
|
{
|
|
struct sockopt_data *sd;
|
|
ipfw_obj_ntlv *ntlv;
|
|
|
|
sd = (struct sockopt_data *)arg;
|
|
ntlv = (ipfw_obj_ntlv *)ipfw_get_sopt_space(sd, sizeof(*ntlv));
|
|
if (ntlv == NULL)
|
|
return;
|
|
ipfw_export_obj_ntlv(no, ntlv);
|
|
}
|
|
|
|
/*
|
|
* Lists all service objects.
|
|
* Data layout (v0)(current):
|
|
* Request: [ ipfw_obj_lheader ] size = ipfw_obj_lheader.size
|
|
* Reply: [ ipfw_obj_lheader [ ipfw_obj_ntlv x N ] (optional) ]
|
|
* Returns 0 on success
|
|
*/
|
|
static int
|
|
dump_srvobjects(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
|
|
struct sockopt_data *sd)
|
|
{
|
|
ipfw_obj_lheader *hdr;
|
|
int count;
|
|
|
|
hdr = (ipfw_obj_lheader *)ipfw_get_sopt_header(sd, sizeof(*hdr));
|
|
if (hdr == NULL)
|
|
return (EINVAL);
|
|
|
|
IPFW_UH_RLOCK(chain);
|
|
count = ipfw_objhash_count(CHAIN_TO_SRV(chain));
|
|
hdr->size = sizeof(ipfw_obj_lheader) + count * sizeof(ipfw_obj_ntlv);
|
|
if (sd->valsize < hdr->size) {
|
|
IPFW_UH_RUNLOCK(chain);
|
|
return (ENOMEM);
|
|
}
|
|
hdr->count = count;
|
|
hdr->objsize = sizeof(ipfw_obj_ntlv);
|
|
if (count > 0)
|
|
ipfw_objhash_foreach(CHAIN_TO_SRV(chain),
|
|
export_objhash_ntlv_internal, sd);
|
|
IPFW_UH_RUNLOCK(chain);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Compares two sopt handlers (code, version and handler ptr).
|
|
* Used both as qsort() and bsearch().
|
|
* Does not compare handler for latter case.
|
|
*
|
|
* Returns 0 if match is found.
|
|
*/
|
|
static int
|
|
compare_sh(const void *_a, const void *_b)
|
|
{
|
|
const struct ipfw_sopt_handler *a, *b;
|
|
|
|
a = (const struct ipfw_sopt_handler *)_a;
|
|
b = (const struct ipfw_sopt_handler *)_b;
|
|
|
|
if (a->opcode < b->opcode)
|
|
return (-1);
|
|
else if (a->opcode > b->opcode)
|
|
return (1);
|
|
|
|
if (a->version < b->version)
|
|
return (-1);
|
|
else if (a->version > b->version)
|
|
return (1);
|
|
|
|
/* bsearch helper */
|
|
if (a->handler == NULL)
|
|
return (0);
|
|
|
|
if ((uintptr_t)a->handler < (uintptr_t)b->handler)
|
|
return (-1);
|
|
else if ((uintptr_t)a->handler > (uintptr_t)b->handler)
|
|
return (1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Finds sopt handler based on @code and @version.
|
|
*
|
|
* Returns pointer to handler or NULL.
|
|
*/
|
|
static struct ipfw_sopt_handler *
|
|
find_sh(uint16_t code, uint8_t version, sopt_handler_f *handler)
|
|
{
|
|
struct ipfw_sopt_handler *sh, h;
|
|
|
|
memset(&h, 0, sizeof(h));
|
|
h.opcode = code;
|
|
h.version = version;
|
|
h.handler = handler;
|
|
|
|
sh = (struct ipfw_sopt_handler *)bsearch(&h, ctl3_handlers,
|
|
ctl3_hsize, sizeof(h), compare_sh);
|
|
|
|
return (sh);
|
|
}
|
|
|
|
static int
|
|
find_ref_sh(uint16_t opcode, uint8_t version, struct ipfw_sopt_handler *psh)
|
|
{
|
|
struct ipfw_sopt_handler *sh;
|
|
|
|
CTL3_LOCK();
|
|
if ((sh = find_sh(opcode, version, NULL)) == NULL) {
|
|
CTL3_UNLOCK();
|
|
printf("ipfw: ipfw_ctl3 invalid option %d""v""%d\n",
|
|
opcode, version);
|
|
return (EINVAL);
|
|
}
|
|
sh->refcnt++;
|
|
ctl3_refct++;
|
|
/* Copy handler data to requested buffer */
|
|
*psh = *sh;
|
|
CTL3_UNLOCK();
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
find_unref_sh(struct ipfw_sopt_handler *psh)
|
|
{
|
|
struct ipfw_sopt_handler *sh;
|
|
|
|
CTL3_LOCK();
|
|
sh = find_sh(psh->opcode, psh->version, NULL);
|
|
KASSERT(sh != NULL, ("ctl3 handler disappeared"));
|
|
sh->refcnt--;
|
|
ctl3_refct--;
|
|
CTL3_UNLOCK();
|
|
}
|
|
|
|
void
|
|
ipfw_init_sopt_handler()
|
|
{
|
|
|
|
CTL3_LOCK_INIT();
|
|
IPFW_ADD_SOPT_HANDLER(1, scodes);
|
|
}
|
|
|
|
void
|
|
ipfw_destroy_sopt_handler()
|
|
{
|
|
|
|
IPFW_DEL_SOPT_HANDLER(1, scodes);
|
|
CTL3_LOCK_DESTROY();
|
|
}
|
|
|
|
/*
|
|
* Adds one or more sockopt handlers to the global array.
|
|
* Function may sleep.
|
|
*/
|
|
void
|
|
ipfw_add_sopt_handler(struct ipfw_sopt_handler *sh, size_t count)
|
|
{
|
|
size_t sz;
|
|
struct ipfw_sopt_handler *tmp;
|
|
|
|
CTL3_LOCK();
|
|
|
|
for (;;) {
|
|
sz = ctl3_hsize + count;
|
|
CTL3_UNLOCK();
|
|
tmp = malloc(sizeof(*sh) * sz, M_IPFW, M_WAITOK | M_ZERO);
|
|
CTL3_LOCK();
|
|
if (ctl3_hsize + count <= sz)
|
|
break;
|
|
|
|
/* Retry */
|
|
free(tmp, M_IPFW);
|
|
}
|
|
|
|
/* Merge old & new arrays */
|
|
sz = ctl3_hsize + count;
|
|
memcpy(tmp, ctl3_handlers, ctl3_hsize * sizeof(*sh));
|
|
memcpy(&tmp[ctl3_hsize], sh, count * sizeof(*sh));
|
|
qsort(tmp, sz, sizeof(*sh), compare_sh);
|
|
/* Switch new and free old */
|
|
if (ctl3_handlers != NULL)
|
|
free(ctl3_handlers, M_IPFW);
|
|
ctl3_handlers = tmp;
|
|
ctl3_hsize = sz;
|
|
ctl3_gencnt++;
|
|
|
|
CTL3_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* Removes one or more sockopt handlers from the global array.
|
|
*/
|
|
int
|
|
ipfw_del_sopt_handler(struct ipfw_sopt_handler *sh, size_t count)
|
|
{
|
|
size_t sz;
|
|
struct ipfw_sopt_handler *tmp, *h;
|
|
int i;
|
|
|
|
CTL3_LOCK();
|
|
|
|
for (i = 0; i < count; i++) {
|
|
tmp = &sh[i];
|
|
h = find_sh(tmp->opcode, tmp->version, tmp->handler);
|
|
if (h == NULL)
|
|
continue;
|
|
|
|
sz = (ctl3_handlers + ctl3_hsize - (h + 1)) * sizeof(*h);
|
|
memmove(h, h + 1, sz);
|
|
ctl3_hsize--;
|
|
}
|
|
|
|
if (ctl3_hsize == 0) {
|
|
if (ctl3_handlers != NULL)
|
|
free(ctl3_handlers, M_IPFW);
|
|
ctl3_handlers = NULL;
|
|
}
|
|
|
|
ctl3_gencnt++;
|
|
|
|
CTL3_UNLOCK();
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Writes data accumulated in @sd to sockopt buffer.
|
|
* Zeroes internal @sd buffer.
|
|
*/
|
|
static int
|
|
ipfw_flush_sopt_data(struct sockopt_data *sd)
|
|
{
|
|
struct sockopt *sopt;
|
|
int error;
|
|
size_t sz;
|
|
|
|
sz = sd->koff;
|
|
if (sz == 0)
|
|
return (0);
|
|
|
|
sopt = sd->sopt;
|
|
|
|
if (sopt->sopt_dir == SOPT_GET) {
|
|
error = copyout(sd->kbuf, sopt->sopt_val, sz);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
|
|
memset(sd->kbuf, 0, sd->ksize);
|
|
sd->ktotal += sz;
|
|
sd->koff = 0;
|
|
if (sd->ktotal + sd->ksize < sd->valsize)
|
|
sd->kavail = sd->ksize;
|
|
else
|
|
sd->kavail = sd->valsize - sd->ktotal;
|
|
|
|
/* Update sopt buffer data */
|
|
sopt->sopt_valsize = sd->ktotal;
|
|
sopt->sopt_val = sd->sopt_val + sd->ktotal;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Ensures that @sd buffer has contigious @neeeded number of
|
|
* bytes.
|
|
*
|
|
* Returns pointer to requested space or NULL.
|
|
*/
|
|
caddr_t
|
|
ipfw_get_sopt_space(struct sockopt_data *sd, size_t needed)
|
|
{
|
|
int error;
|
|
caddr_t addr;
|
|
|
|
if (sd->kavail < needed) {
|
|
/*
|
|
* Flush data and try another time.
|
|
*/
|
|
error = ipfw_flush_sopt_data(sd);
|
|
|
|
if (sd->kavail < needed || error != 0)
|
|
return (NULL);
|
|
}
|
|
|
|
addr = sd->kbuf + sd->koff;
|
|
sd->koff += needed;
|
|
sd->kavail -= needed;
|
|
return (addr);
|
|
}
|
|
|
|
/*
|
|
* Requests @needed contigious bytes from @sd buffer.
|
|
* Function is used to notify subsystem that we are
|
|
* interesed in first @needed bytes (request header)
|
|
* and the rest buffer can be safely zeroed.
|
|
*
|
|
* Returns pointer to requested space or NULL.
|
|
*/
|
|
caddr_t
|
|
ipfw_get_sopt_header(struct sockopt_data *sd, size_t needed)
|
|
{
|
|
caddr_t addr;
|
|
|
|
if ((addr = ipfw_get_sopt_space(sd, needed)) == NULL)
|
|
return (NULL);
|
|
|
|
if (sd->kavail > 0)
|
|
memset(sd->kbuf + sd->koff, 0, sd->kavail);
|
|
|
|
return (addr);
|
|
}
|
|
|
|
/*
|
|
* New sockopt handler.
|
|
*/
|
|
int
|
|
ipfw_ctl3(struct sockopt *sopt)
|
|
{
|
|
int error, locked;
|
|
size_t size, valsize;
|
|
struct ip_fw_chain *chain;
|
|
char xbuf[256];
|
|
struct sockopt_data sdata;
|
|
struct ipfw_sopt_handler h;
|
|
ip_fw3_opheader *op3 = NULL;
|
|
|
|
error = priv_check(sopt->sopt_td, PRIV_NETINET_IPFW);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
if (sopt->sopt_name != IP_FW3)
|
|
return (ipfw_ctl(sopt));
|
|
|
|
chain = &V_layer3_chain;
|
|
error = 0;
|
|
|
|
/* Save original valsize before it is altered via sooptcopyin() */
|
|
valsize = sopt->sopt_valsize;
|
|
memset(&sdata, 0, sizeof(sdata));
|
|
/* Read op3 header first to determine actual operation */
|
|
op3 = (ip_fw3_opheader *)xbuf;
|
|
error = sooptcopyin(sopt, op3, sizeof(*op3), sizeof(*op3));
|
|
if (error != 0)
|
|
return (error);
|
|
sopt->sopt_valsize = valsize;
|
|
|
|
/*
|
|
* Find and reference command.
|
|
*/
|
|
error = find_ref_sh(op3->opcode, op3->version, &h);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
/*
|
|
* Disallow modifications in really-really secure mode, but still allow
|
|
* the logging counters to be reset.
|
|
*/
|
|
if ((h.dir & HDIR_SET) != 0 && h.opcode != IP_FW_XRESETLOG) {
|
|
error = securelevel_ge(sopt->sopt_td->td_ucred, 3);
|
|
if (error != 0) {
|
|
find_unref_sh(&h);
|
|
return (error);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Fill in sockopt_data structure that may be useful for
|
|
* IP_FW3 get requests.
|
|
*/
|
|
locked = 0;
|
|
if (valsize <= sizeof(xbuf)) {
|
|
/* use on-stack buffer */
|
|
sdata.kbuf = xbuf;
|
|
sdata.ksize = sizeof(xbuf);
|
|
sdata.kavail = valsize;
|
|
} else {
|
|
|
|
/*
|
|
* Determine opcode type/buffer size:
|
|
* allocate sliding-window buf for data export or
|
|
* contigious buffer for special ops.
|
|
*/
|
|
if ((h.dir & HDIR_SET) != 0) {
|
|
/* Set request. Allocate contigous buffer. */
|
|
if (valsize > CTL3_LARGEBUF) {
|
|
find_unref_sh(&h);
|
|
return (EFBIG);
|
|
}
|
|
|
|
size = valsize;
|
|
} else {
|
|
/* Get request. Allocate sliding window buffer */
|
|
size = (valsize<CTL3_SMALLBUF) ? valsize:CTL3_SMALLBUF;
|
|
|
|
if (size < valsize) {
|
|
/* We have to wire user buffer */
|
|
error = vslock(sopt->sopt_val, valsize);
|
|
if (error != 0)
|
|
return (error);
|
|
locked = 1;
|
|
}
|
|
}
|
|
|
|
sdata.kbuf = malloc(size, M_TEMP, M_WAITOK | M_ZERO);
|
|
sdata.ksize = size;
|
|
sdata.kavail = size;
|
|
}
|
|
|
|
sdata.sopt = sopt;
|
|
sdata.sopt_val = sopt->sopt_val;
|
|
sdata.valsize = valsize;
|
|
|
|
/*
|
|
* Copy either all request (if valsize < bsize_max)
|
|
* or first bsize_max bytes to guarantee most consumers
|
|
* that all necessary data has been copied).
|
|
* Anyway, copy not less than sizeof(ip_fw3_opheader).
|
|
*/
|
|
if ((error = sooptcopyin(sopt, sdata.kbuf, sdata.ksize,
|
|
sizeof(ip_fw3_opheader))) != 0)
|
|
return (error);
|
|
op3 = (ip_fw3_opheader *)sdata.kbuf;
|
|
|
|
/* Finally, run handler */
|
|
error = h.handler(chain, op3, &sdata);
|
|
find_unref_sh(&h);
|
|
|
|
/* Flush state and free buffers */
|
|
if (error == 0)
|
|
error = ipfw_flush_sopt_data(&sdata);
|
|
else
|
|
ipfw_flush_sopt_data(&sdata);
|
|
|
|
if (locked != 0)
|
|
vsunlock(sdata.sopt_val, valsize);
|
|
|
|
/* Restore original pointer and set number of bytes written */
|
|
sopt->sopt_val = sdata.sopt_val;
|
|
sopt->sopt_valsize = sdata.ktotal;
|
|
if (sdata.kbuf != xbuf)
|
|
free(sdata.kbuf, M_TEMP);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/**
|
|
* {set|get}sockopt parser.
|
|
*/
|
|
int
|
|
ipfw_ctl(struct sockopt *sopt)
|
|
{
|
|
#define RULE_MAXSIZE (512*sizeof(u_int32_t))
|
|
int error;
|
|
size_t size, valsize;
|
|
struct ip_fw *buf;
|
|
struct ip_fw_rule0 *rule;
|
|
struct ip_fw_chain *chain;
|
|
u_int32_t rulenum[2];
|
|
uint32_t opt;
|
|
struct rule_check_info ci;
|
|
IPFW_RLOCK_TRACKER;
|
|
|
|
chain = &V_layer3_chain;
|
|
error = 0;
|
|
|
|
/* Save original valsize before it is altered via sooptcopyin() */
|
|
valsize = sopt->sopt_valsize;
|
|
opt = sopt->sopt_name;
|
|
|
|
/*
|
|
* Disallow modifications in really-really secure mode, but still allow
|
|
* the logging counters to be reset.
|
|
*/
|
|
if (opt == IP_FW_ADD ||
|
|
(sopt->sopt_dir == SOPT_SET && opt != IP_FW_RESETLOG)) {
|
|
error = securelevel_ge(sopt->sopt_td->td_ucred, 3);
|
|
if (error != 0)
|
|
return (error);
|
|
}
|
|
|
|
switch (opt) {
|
|
case IP_FW_GET:
|
|
/*
|
|
* pass up a copy of the current rules. Static rules
|
|
* come first (the last of which has number IPFW_DEFAULT_RULE),
|
|
* followed by a possibly empty list of dynamic rule.
|
|
* The last dynamic rule has NULL in the "next" field.
|
|
*
|
|
* Note that the calculated size is used to bound the
|
|
* amount of data returned to the user. The rule set may
|
|
* change between calculating the size and returning the
|
|
* data in which case we'll just return what fits.
|
|
*/
|
|
for (;;) {
|
|
int len = 0, want;
|
|
|
|
size = chain->static_len;
|
|
size += ipfw_dyn_len();
|
|
if (size >= sopt->sopt_valsize)
|
|
break;
|
|
buf = malloc(size, M_TEMP, M_WAITOK | M_ZERO);
|
|
IPFW_UH_RLOCK(chain);
|
|
/* check again how much space we need */
|
|
want = chain->static_len + ipfw_dyn_len();
|
|
if (size >= want)
|
|
len = ipfw_getrules(chain, buf, size);
|
|
IPFW_UH_RUNLOCK(chain);
|
|
if (size >= want)
|
|
error = sooptcopyout(sopt, buf, len);
|
|
free(buf, M_TEMP);
|
|
if (size >= want)
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case IP_FW_FLUSH:
|
|
/* locking is done within del_entry() */
|
|
error = del_entry(chain, 0); /* special case, rule=0, cmd=0 means all */
|
|
break;
|
|
|
|
case IP_FW_ADD:
|
|
rule = malloc(RULE_MAXSIZE, M_TEMP, M_WAITOK);
|
|
error = sooptcopyin(sopt, rule, RULE_MAXSIZE,
|
|
sizeof(struct ip_fw7) );
|
|
|
|
memset(&ci, 0, sizeof(struct rule_check_info));
|
|
|
|
/*
|
|
* If the size of commands equals RULESIZE7 then we assume
|
|
* a FreeBSD7.2 binary is talking to us (set is7=1).
|
|
* is7 is persistent so the next 'ipfw list' command
|
|
* will use this format.
|
|
* NOTE: If wrong version is guessed (this can happen if
|
|
* the first ipfw command is 'ipfw [pipe] list')
|
|
* the ipfw binary may crash or loop infinitly...
|
|
*/
|
|
size = sopt->sopt_valsize;
|
|
if (size == RULESIZE7(rule)) {
|
|
is7 = 1;
|
|
error = convert_rule_to_8(rule);
|
|
if (error) {
|
|
free(rule, M_TEMP);
|
|
return error;
|
|
}
|
|
size = RULESIZE(rule);
|
|
} else
|
|
is7 = 0;
|
|
if (error == 0)
|
|
error = check_ipfw_rule0(rule, size, &ci);
|
|
if (error == 0) {
|
|
/* locking is done within add_rule() */
|
|
struct ip_fw *krule;
|
|
krule = ipfw_alloc_rule(chain, RULEKSIZE0(rule));
|
|
ci.urule = (caddr_t)rule;
|
|
ci.krule = krule;
|
|
import_rule0(&ci);
|
|
error = commit_rules(chain, &ci, 1);
|
|
if (!error && sopt->sopt_dir == SOPT_GET) {
|
|
if (is7) {
|
|
error = convert_rule_to_7(rule);
|
|
size = RULESIZE7(rule);
|
|
if (error) {
|
|
free(rule, M_TEMP);
|
|
return error;
|
|
}
|
|
}
|
|
error = sooptcopyout(sopt, rule, size);
|
|
}
|
|
}
|
|
free(rule, M_TEMP);
|
|
break;
|
|
|
|
case IP_FW_DEL:
|
|
/*
|
|
* IP_FW_DEL is used for deleting single rules or sets,
|
|
* and (ab)used to atomically manipulate sets. Argument size
|
|
* is used to distinguish between the two:
|
|
* sizeof(u_int32_t)
|
|
* delete single rule or set of rules,
|
|
* or reassign rules (or sets) to a different set.
|
|
* 2*sizeof(u_int32_t)
|
|
* atomic disable/enable sets.
|
|
* first u_int32_t contains sets to be disabled,
|
|
* second u_int32_t contains sets to be enabled.
|
|
*/
|
|
error = sooptcopyin(sopt, rulenum,
|
|
2*sizeof(u_int32_t), sizeof(u_int32_t));
|
|
if (error)
|
|
break;
|
|
size = sopt->sopt_valsize;
|
|
if (size == sizeof(u_int32_t) && rulenum[0] != 0) {
|
|
/* delete or reassign, locking done in del_entry() */
|
|
error = del_entry(chain, rulenum[0]);
|
|
} else if (size == 2*sizeof(u_int32_t)) { /* set enable/disable */
|
|
IPFW_UH_WLOCK(chain);
|
|
V_set_disable =
|
|
(V_set_disable | rulenum[0]) & ~rulenum[1] &
|
|
~(1<<RESVD_SET); /* set RESVD_SET always enabled */
|
|
IPFW_UH_WUNLOCK(chain);
|
|
} else
|
|
error = EINVAL;
|
|
break;
|
|
|
|
case IP_FW_ZERO:
|
|
case IP_FW_RESETLOG: /* argument is an u_int_32, the rule number */
|
|
rulenum[0] = 0;
|
|
if (sopt->sopt_val != 0) {
|
|
error = sooptcopyin(sopt, rulenum,
|
|
sizeof(u_int32_t), sizeof(u_int32_t));
|
|
if (error)
|
|
break;
|
|
}
|
|
error = zero_entry(chain, rulenum[0],
|
|
sopt->sopt_name == IP_FW_RESETLOG);
|
|
break;
|
|
|
|
/*--- TABLE opcodes ---*/
|
|
case IP_FW_TABLE_ADD:
|
|
case IP_FW_TABLE_DEL:
|
|
{
|
|
ipfw_table_entry ent;
|
|
struct tentry_info tei;
|
|
struct tid_info ti;
|
|
struct table_value v;
|
|
|
|
error = sooptcopyin(sopt, &ent,
|
|
sizeof(ent), sizeof(ent));
|
|
if (error)
|
|
break;
|
|
|
|
memset(&tei, 0, sizeof(tei));
|
|
tei.paddr = &ent.addr;
|
|
tei.subtype = AF_INET;
|
|
tei.masklen = ent.masklen;
|
|
ipfw_import_table_value_legacy(ent.value, &v);
|
|
tei.pvalue = &v;
|
|
memset(&ti, 0, sizeof(ti));
|
|
ti.uidx = ent.tbl;
|
|
ti.type = IPFW_TABLE_CIDR;
|
|
|
|
error = (opt == IP_FW_TABLE_ADD) ?
|
|
add_table_entry(chain, &ti, &tei, 0, 1) :
|
|
del_table_entry(chain, &ti, &tei, 0, 1);
|
|
}
|
|
break;
|
|
|
|
|
|
case IP_FW_TABLE_FLUSH:
|
|
{
|
|
u_int16_t tbl;
|
|
struct tid_info ti;
|
|
|
|
error = sooptcopyin(sopt, &tbl,
|
|
sizeof(tbl), sizeof(tbl));
|
|
if (error)
|
|
break;
|
|
memset(&ti, 0, sizeof(ti));
|
|
ti.uidx = tbl;
|
|
error = flush_table(chain, &ti);
|
|
}
|
|
break;
|
|
|
|
case IP_FW_TABLE_GETSIZE:
|
|
{
|
|
u_int32_t tbl, cnt;
|
|
struct tid_info ti;
|
|
|
|
if ((error = sooptcopyin(sopt, &tbl, sizeof(tbl),
|
|
sizeof(tbl))))
|
|
break;
|
|
memset(&ti, 0, sizeof(ti));
|
|
ti.uidx = tbl;
|
|
IPFW_RLOCK(chain);
|
|
error = ipfw_count_table(chain, &ti, &cnt);
|
|
IPFW_RUNLOCK(chain);
|
|
if (error)
|
|
break;
|
|
error = sooptcopyout(sopt, &cnt, sizeof(cnt));
|
|
}
|
|
break;
|
|
|
|
case IP_FW_TABLE_LIST:
|
|
{
|
|
ipfw_table *tbl;
|
|
struct tid_info ti;
|
|
|
|
if (sopt->sopt_valsize < sizeof(*tbl)) {
|
|
error = EINVAL;
|
|
break;
|
|
}
|
|
size = sopt->sopt_valsize;
|
|
tbl = malloc(size, M_TEMP, M_WAITOK);
|
|
error = sooptcopyin(sopt, tbl, size, sizeof(*tbl));
|
|
if (error) {
|
|
free(tbl, M_TEMP);
|
|
break;
|
|
}
|
|
tbl->size = (size - sizeof(*tbl)) /
|
|
sizeof(ipfw_table_entry);
|
|
memset(&ti, 0, sizeof(ti));
|
|
ti.uidx = tbl->tbl;
|
|
IPFW_RLOCK(chain);
|
|
error = ipfw_dump_table_legacy(chain, &ti, tbl);
|
|
IPFW_RUNLOCK(chain);
|
|
if (error) {
|
|
free(tbl, M_TEMP);
|
|
break;
|
|
}
|
|
error = sooptcopyout(sopt, tbl, size);
|
|
free(tbl, M_TEMP);
|
|
}
|
|
break;
|
|
|
|
/*--- NAT operations are protected by the IPFW_LOCK ---*/
|
|
case IP_FW_NAT_CFG:
|
|
if (IPFW_NAT_LOADED)
|
|
error = ipfw_nat_cfg_ptr(sopt);
|
|
else {
|
|
printf("IP_FW_NAT_CFG: %s\n",
|
|
"ipfw_nat not present, please load it");
|
|
error = EINVAL;
|
|
}
|
|
break;
|
|
|
|
case IP_FW_NAT_DEL:
|
|
if (IPFW_NAT_LOADED)
|
|
error = ipfw_nat_del_ptr(sopt);
|
|
else {
|
|
printf("IP_FW_NAT_DEL: %s\n",
|
|
"ipfw_nat not present, please load it");
|
|
error = EINVAL;
|
|
}
|
|
break;
|
|
|
|
case IP_FW_NAT_GET_CONFIG:
|
|
if (IPFW_NAT_LOADED)
|
|
error = ipfw_nat_get_cfg_ptr(sopt);
|
|
else {
|
|
printf("IP_FW_NAT_GET_CFG: %s\n",
|
|
"ipfw_nat not present, please load it");
|
|
error = EINVAL;
|
|
}
|
|
break;
|
|
|
|
case IP_FW_NAT_GET_LOG:
|
|
if (IPFW_NAT_LOADED)
|
|
error = ipfw_nat_get_log_ptr(sopt);
|
|
else {
|
|
printf("IP_FW_NAT_GET_LOG: %s\n",
|
|
"ipfw_nat not present, please load it");
|
|
error = EINVAL;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
printf("ipfw: ipfw_ctl invalid option %d\n", sopt->sopt_name);
|
|
error = EINVAL;
|
|
}
|
|
|
|
return (error);
|
|
#undef RULE_MAXSIZE
|
|
}
|
|
#define RULE_MAXSIZE (256*sizeof(u_int32_t))
|
|
|
|
/* Functions to convert rules 7.2 <==> 8.0 */
|
|
static int
|
|
convert_rule_to_7(struct ip_fw_rule0 *rule)
|
|
{
|
|
/* Used to modify original rule */
|
|
struct ip_fw7 *rule7 = (struct ip_fw7 *)rule;
|
|
/* copy of original rule, version 8 */
|
|
struct ip_fw_rule0 *tmp;
|
|
|
|
/* Used to copy commands */
|
|
ipfw_insn *ccmd, *dst;
|
|
int ll = 0, ccmdlen = 0;
|
|
|
|
tmp = malloc(RULE_MAXSIZE, M_TEMP, M_NOWAIT | M_ZERO);
|
|
if (tmp == NULL) {
|
|
return 1; //XXX error
|
|
}
|
|
bcopy(rule, tmp, RULE_MAXSIZE);
|
|
|
|
/* Copy fields */
|
|
//rule7->_pad = tmp->_pad;
|
|
rule7->set = tmp->set;
|
|
rule7->rulenum = tmp->rulenum;
|
|
rule7->cmd_len = tmp->cmd_len;
|
|
rule7->act_ofs = tmp->act_ofs;
|
|
rule7->next_rule = (struct ip_fw7 *)tmp->next_rule;
|
|
rule7->cmd_len = tmp->cmd_len;
|
|
rule7->pcnt = tmp->pcnt;
|
|
rule7->bcnt = tmp->bcnt;
|
|
rule7->timestamp = tmp->timestamp;
|
|
|
|
/* Copy commands */
|
|
for (ll = tmp->cmd_len, ccmd = tmp->cmd, dst = rule7->cmd ;
|
|
ll > 0 ; ll -= ccmdlen, ccmd += ccmdlen, dst += ccmdlen) {
|
|
ccmdlen = F_LEN(ccmd);
|
|
|
|
bcopy(ccmd, dst, F_LEN(ccmd)*sizeof(uint32_t));
|
|
|
|
if (dst->opcode > O_NAT)
|
|
/* O_REASS doesn't exists in 7.2 version, so
|
|
* decrement opcode if it is after O_REASS
|
|
*/
|
|
dst->opcode--;
|
|
|
|
if (ccmdlen > ll) {
|
|
printf("ipfw: opcode %d size truncated\n",
|
|
ccmd->opcode);
|
|
return EINVAL;
|
|
}
|
|
}
|
|
free(tmp, M_TEMP);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
convert_rule_to_8(struct ip_fw_rule0 *rule)
|
|
{
|
|
/* Used to modify original rule */
|
|
struct ip_fw7 *rule7 = (struct ip_fw7 *) rule;
|
|
|
|
/* Used to copy commands */
|
|
ipfw_insn *ccmd, *dst;
|
|
int ll = 0, ccmdlen = 0;
|
|
|
|
/* Copy of original rule */
|
|
struct ip_fw7 *tmp = malloc(RULE_MAXSIZE, M_TEMP, M_NOWAIT | M_ZERO);
|
|
if (tmp == NULL) {
|
|
return 1; //XXX error
|
|
}
|
|
|
|
bcopy(rule7, tmp, RULE_MAXSIZE);
|
|
|
|
for (ll = tmp->cmd_len, ccmd = tmp->cmd, dst = rule->cmd ;
|
|
ll > 0 ; ll -= ccmdlen, ccmd += ccmdlen, dst += ccmdlen) {
|
|
ccmdlen = F_LEN(ccmd);
|
|
|
|
bcopy(ccmd, dst, F_LEN(ccmd)*sizeof(uint32_t));
|
|
|
|
if (dst->opcode > O_NAT)
|
|
/* O_REASS doesn't exists in 7.2 version, so
|
|
* increment opcode if it is after O_REASS
|
|
*/
|
|
dst->opcode++;
|
|
|
|
if (ccmdlen > ll) {
|
|
printf("ipfw: opcode %d size truncated\n",
|
|
ccmd->opcode);
|
|
return EINVAL;
|
|
}
|
|
}
|
|
|
|
rule->_pad = tmp->_pad;
|
|
rule->set = tmp->set;
|
|
rule->rulenum = tmp->rulenum;
|
|
rule->cmd_len = tmp->cmd_len;
|
|
rule->act_ofs = tmp->act_ofs;
|
|
rule->next_rule = (struct ip_fw *)tmp->next_rule;
|
|
rule->cmd_len = tmp->cmd_len;
|
|
rule->id = 0; /* XXX see if is ok = 0 */
|
|
rule->pcnt = tmp->pcnt;
|
|
rule->bcnt = tmp->bcnt;
|
|
rule->timestamp = tmp->timestamp;
|
|
|
|
free (tmp, M_TEMP);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Named object api
|
|
*
|
|
*/
|
|
|
|
void
|
|
ipfw_init_srv(struct ip_fw_chain *ch)
|
|
{
|
|
|
|
ch->srvmap = ipfw_objhash_create(IPFW_OBJECTS_DEFAULT);
|
|
ch->srvstate = malloc(sizeof(void *) * IPFW_OBJECTS_DEFAULT,
|
|
M_IPFW, M_WAITOK | M_ZERO);
|
|
}
|
|
|
|
void
|
|
ipfw_destroy_srv(struct ip_fw_chain *ch)
|
|
{
|
|
|
|
free(ch->srvstate, M_IPFW);
|
|
ipfw_objhash_destroy(ch->srvmap);
|
|
}
|
|
|
|
/*
|
|
* Allocate new bitmask which can be used to enlarge/shrink
|
|
* named instance index.
|
|
*/
|
|
void
|
|
ipfw_objhash_bitmap_alloc(uint32_t items, void **idx, int *pblocks)
|
|
{
|
|
size_t size;
|
|
int max_blocks;
|
|
u_long *idx_mask;
|
|
|
|
KASSERT((items % BLOCK_ITEMS) == 0,
|
|
("bitmask size needs to power of 2 and greater or equal to %zu",
|
|
BLOCK_ITEMS));
|
|
|
|
max_blocks = items / BLOCK_ITEMS;
|
|
size = items / 8;
|
|
idx_mask = malloc(size * IPFW_MAX_SETS, M_IPFW, M_WAITOK);
|
|
/* Mark all as free */
|
|
memset(idx_mask, 0xFF, size * IPFW_MAX_SETS);
|
|
*idx_mask &= ~(u_long)1; /* Skip index 0 */
|
|
|
|
*idx = idx_mask;
|
|
*pblocks = max_blocks;
|
|
}
|
|
|
|
/*
|
|
* Copy current bitmask index to new one.
|
|
*/
|
|
void
|
|
ipfw_objhash_bitmap_merge(struct namedobj_instance *ni, void **idx, int *blocks)
|
|
{
|
|
int old_blocks, new_blocks;
|
|
u_long *old_idx, *new_idx;
|
|
int i;
|
|
|
|
old_idx = ni->idx_mask;
|
|
old_blocks = ni->max_blocks;
|
|
new_idx = *idx;
|
|
new_blocks = *blocks;
|
|
|
|
for (i = 0; i < IPFW_MAX_SETS; i++) {
|
|
memcpy(&new_idx[new_blocks * i], &old_idx[old_blocks * i],
|
|
old_blocks * sizeof(u_long));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Swaps current @ni index with new one.
|
|
*/
|
|
void
|
|
ipfw_objhash_bitmap_swap(struct namedobj_instance *ni, void **idx, int *blocks)
|
|
{
|
|
int old_blocks;
|
|
u_long *old_idx;
|
|
|
|
old_idx = ni->idx_mask;
|
|
old_blocks = ni->max_blocks;
|
|
|
|
ni->idx_mask = *idx;
|
|
ni->max_blocks = *blocks;
|
|
|
|
/* Save old values */
|
|
*idx = old_idx;
|
|
*blocks = old_blocks;
|
|
}
|
|
|
|
void
|
|
ipfw_objhash_bitmap_free(void *idx, int blocks)
|
|
{
|
|
|
|
free(idx, M_IPFW);
|
|
}
|
|
|
|
/*
|
|
* Creates named hash instance.
|
|
* Must be called without holding any locks.
|
|
* Return pointer to new instance.
|
|
*/
|
|
struct namedobj_instance *
|
|
ipfw_objhash_create(uint32_t items)
|
|
{
|
|
struct namedobj_instance *ni;
|
|
int i;
|
|
size_t size;
|
|
|
|
size = sizeof(struct namedobj_instance) +
|
|
sizeof(struct namedobjects_head) * NAMEDOBJ_HASH_SIZE +
|
|
sizeof(struct namedobjects_head) * NAMEDOBJ_HASH_SIZE;
|
|
|
|
ni = malloc(size, M_IPFW, M_WAITOK | M_ZERO);
|
|
ni->nn_size = NAMEDOBJ_HASH_SIZE;
|
|
ni->nv_size = NAMEDOBJ_HASH_SIZE;
|
|
|
|
ni->names = (struct namedobjects_head *)(ni +1);
|
|
ni->values = &ni->names[ni->nn_size];
|
|
|
|
for (i = 0; i < ni->nn_size; i++)
|
|
TAILQ_INIT(&ni->names[i]);
|
|
|
|
for (i = 0; i < ni->nv_size; i++)
|
|
TAILQ_INIT(&ni->values[i]);
|
|
|
|
/* Set default hashing/comparison functions */
|
|
ni->hash_f = objhash_hash_name;
|
|
ni->cmp_f = objhash_cmp_name;
|
|
|
|
/* Allocate bitmask separately due to possible resize */
|
|
ipfw_objhash_bitmap_alloc(items, (void*)&ni->idx_mask, &ni->max_blocks);
|
|
|
|
return (ni);
|
|
}
|
|
|
|
void
|
|
ipfw_objhash_destroy(struct namedobj_instance *ni)
|
|
{
|
|
|
|
free(ni->idx_mask, M_IPFW);
|
|
free(ni, M_IPFW);
|
|
}
|
|
|
|
void
|
|
ipfw_objhash_set_funcs(struct namedobj_instance *ni, objhash_hash_f *hash_f,
|
|
objhash_cmp_f *cmp_f)
|
|
{
|
|
|
|
ni->hash_f = hash_f;
|
|
ni->cmp_f = cmp_f;
|
|
}
|
|
|
|
static uint32_t
|
|
objhash_hash_name(struct namedobj_instance *ni, void *name, uint32_t set)
|
|
{
|
|
|
|
return (fnv_32_str((char *)name, FNV1_32_INIT));
|
|
}
|
|
|
|
static int
|
|
objhash_cmp_name(struct named_object *no, void *name, uint32_t set)
|
|
{
|
|
|
|
if ((strcmp(no->name, (char *)name) == 0) && (no->set == set))
|
|
return (0);
|
|
|
|
return (1);
|
|
}
|
|
|
|
static uint32_t
|
|
objhash_hash_idx(struct namedobj_instance *ni, uint32_t val)
|
|
{
|
|
uint32_t v;
|
|
|
|
v = val % (ni->nv_size - 1);
|
|
|
|
return (v);
|
|
}
|
|
|
|
struct named_object *
|
|
ipfw_objhash_lookup_name(struct namedobj_instance *ni, uint32_t set, char *name)
|
|
{
|
|
struct named_object *no;
|
|
uint32_t hash;
|
|
|
|
hash = ni->hash_f(ni, name, set) % ni->nn_size;
|
|
|
|
TAILQ_FOREACH(no, &ni->names[hash], nn_next) {
|
|
if (ni->cmp_f(no, name, set) == 0)
|
|
return (no);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Find named object by name, considering also its TLV type.
|
|
*/
|
|
struct named_object *
|
|
ipfw_objhash_lookup_name_type(struct namedobj_instance *ni, uint32_t set,
|
|
uint32_t type, char *name)
|
|
{
|
|
struct named_object *no;
|
|
uint32_t hash;
|
|
|
|
hash = ni->hash_f(ni, name, set) % ni->nn_size;
|
|
|
|
TAILQ_FOREACH(no, &ni->names[hash], nn_next) {
|
|
if (ni->cmp_f(no, name, set) == 0 && no->etlv == type)
|
|
return (no);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
struct named_object *
|
|
ipfw_objhash_lookup_kidx(struct namedobj_instance *ni, uint16_t kidx)
|
|
{
|
|
struct named_object *no;
|
|
uint32_t hash;
|
|
|
|
hash = objhash_hash_idx(ni, kidx);
|
|
|
|
TAILQ_FOREACH(no, &ni->values[hash], nv_next) {
|
|
if (no->kidx == kidx)
|
|
return (no);
|
|
}
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
int
|
|
ipfw_objhash_same_name(struct namedobj_instance *ni, struct named_object *a,
|
|
struct named_object *b)
|
|
{
|
|
|
|
if ((strcmp(a->name, b->name) == 0) && a->set == b->set)
|
|
return (1);
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
ipfw_objhash_add(struct namedobj_instance *ni, struct named_object *no)
|
|
{
|
|
uint32_t hash;
|
|
|
|
hash = ni->hash_f(ni, no->name, no->set) % ni->nn_size;
|
|
TAILQ_INSERT_HEAD(&ni->names[hash], no, nn_next);
|
|
|
|
hash = objhash_hash_idx(ni, no->kidx);
|
|
TAILQ_INSERT_HEAD(&ni->values[hash], no, nv_next);
|
|
|
|
ni->count++;
|
|
}
|
|
|
|
void
|
|
ipfw_objhash_del(struct namedobj_instance *ni, struct named_object *no)
|
|
{
|
|
uint32_t hash;
|
|
|
|
hash = ni->hash_f(ni, no->name, no->set) % ni->nn_size;
|
|
TAILQ_REMOVE(&ni->names[hash], no, nn_next);
|
|
|
|
hash = objhash_hash_idx(ni, no->kidx);
|
|
TAILQ_REMOVE(&ni->values[hash], no, nv_next);
|
|
|
|
ni->count--;
|
|
}
|
|
|
|
uint32_t
|
|
ipfw_objhash_count(struct namedobj_instance *ni)
|
|
{
|
|
|
|
return (ni->count);
|
|
}
|
|
|
|
/*
|
|
* Runs @func for each found named object.
|
|
* It is safe to delete objects from callback
|
|
*/
|
|
void
|
|
ipfw_objhash_foreach(struct namedobj_instance *ni, objhash_cb_t *f, void *arg)
|
|
{
|
|
struct named_object *no, *no_tmp;
|
|
int i;
|
|
|
|
for (i = 0; i < ni->nn_size; i++) {
|
|
TAILQ_FOREACH_SAFE(no, &ni->names[i], nn_next, no_tmp)
|
|
f(ni, no, arg);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Removes index from given set.
|
|
* Returns 0 on success.
|
|
*/
|
|
int
|
|
ipfw_objhash_free_idx(struct namedobj_instance *ni, uint16_t idx)
|
|
{
|
|
u_long *mask;
|
|
int i, v;
|
|
|
|
i = idx / BLOCK_ITEMS;
|
|
v = idx % BLOCK_ITEMS;
|
|
|
|
if (i >= ni->max_blocks)
|
|
return (1);
|
|
|
|
mask = &ni->idx_mask[i];
|
|
|
|
if ((*mask & ((u_long)1 << v)) != 0)
|
|
return (1);
|
|
|
|
/* Mark as free */
|
|
*mask |= (u_long)1 << v;
|
|
|
|
/* Update free offset */
|
|
if (ni->free_off[0] > i)
|
|
ni->free_off[0] = i;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Allocate new index in given instance and stores in in @pidx.
|
|
* Returns 0 on success.
|
|
*/
|
|
int
|
|
ipfw_objhash_alloc_idx(void *n, uint16_t *pidx)
|
|
{
|
|
struct namedobj_instance *ni;
|
|
u_long *mask;
|
|
int i, off, v;
|
|
|
|
ni = (struct namedobj_instance *)n;
|
|
|
|
off = ni->free_off[0];
|
|
mask = &ni->idx_mask[off];
|
|
|
|
for (i = off; i < ni->max_blocks; i++, mask++) {
|
|
if ((v = ffsl(*mask)) == 0)
|
|
continue;
|
|
|
|
/* Mark as busy */
|
|
*mask &= ~ ((u_long)1 << (v - 1));
|
|
|
|
ni->free_off[0] = i;
|
|
|
|
v = BLOCK_ITEMS * i + v - 1;
|
|
|
|
*pidx = v;
|
|
return (0);
|
|
}
|
|
|
|
return (1);
|
|
}
|
|
|
|
/* end of file */
|