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freebsd-dev/sys/netpfil/ipfw/ip_fw_sockopt.c
Andrey V. Elsukov b2df1f7ea1 o Teach opcode rewriting framework handle several rewriters for 
the same opcode.

o Reduce number of times classifier callback is called. It is
  redundant to call it just after find_op_rw(), since the last
  does call it already and can have all results.

o Do immediately opcode rewrite in the ref_opcode_object().
  This eliminates additional classifier lookup later on bulk update.
  For unresolved opcodes the behavior still the same, we save information
  from classifier callback in the obj_idx array, then perform automatic
  objects creation, then perform rewriting for opcodes using indeces
  from created objects.

Obtained from:	Yandex LLC
Sponsored by:	Yandex LLC
2016-04-14 21:31:16 +00:00

4218 lines
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/*-
* Copyright (c) 2002-2009 Luigi Rizzo, Universita` di Pisa
* Copyright (c) 2014 Yandex LLC
* Copyright (c) 2014 Alexander V. Chernikov
*
* Supported by: Valeria Paoli
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* Control socket and rule management routines for ipfw.
* Control is currently implemented via IP_FW3 setsockopt() code.
*/
#include "opt_ipfw.h"
#include "opt_inet.h"
#ifndef INET
#error IPFIREWALL requires INET.
#endif /* INET */
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h> /* struct m_tag used by nested headers */
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/rwlock.h>
#include <sys/rmlock.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/fnv_hash.h>
#include <net/if.h>
#include <net/route.h>
#include <net/vnet.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <netinet/in.h>
#include <netinet/ip_var.h> /* hooks */
#include <netinet/ip_fw.h>
#include <netpfil/ipfw/ip_fw_private.h>
#include <netpfil/ipfw/ip_fw_table.h>
#ifdef MAC
#include <security/mac/mac_framework.h>
#endif
static int ipfw_ctl(struct sockopt *sopt);
static int check_ipfw_rule_body(ipfw_insn *cmd, int cmd_len,
struct rule_check_info *ci);
static int check_ipfw_rule1(struct ip_fw_rule *rule, int size,
struct rule_check_info *ci);
static int check_ipfw_rule0(struct ip_fw_rule0 *rule, int size,
struct rule_check_info *ci);
static int rewrite_rule_uidx(struct ip_fw_chain *chain,
struct rule_check_info *ci);
#define NAMEDOBJ_HASH_SIZE 32
struct namedobj_instance {
struct namedobjects_head *names;
struct namedobjects_head *values;
uint32_t nn_size; /* names hash size */
uint32_t nv_size; /* number hash size */
u_long *idx_mask; /* used items bitmask */
uint32_t max_blocks; /* number of "long" blocks in bitmask */
uint32_t count; /* number of items */
uint16_t free_off[IPFW_MAX_SETS]; /* first possible free offset */
objhash_hash_f *hash_f;
objhash_cmp_f *cmp_f;
};
#define BLOCK_ITEMS (8 * sizeof(u_long)) /* Number of items for ffsl() */
static uint32_t objhash_hash_name(struct namedobj_instance *ni, void *key,
uint32_t kopt);
static uint32_t objhash_hash_idx(struct namedobj_instance *ni, uint32_t val);
static int objhash_cmp_name(struct named_object *no, void *name, uint32_t set);
MALLOC_DEFINE(M_IPFW, "IpFw/IpAcct", "IpFw/IpAcct chain's");
static int dump_config(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
struct sockopt_data *sd);
static int add_rules(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
struct sockopt_data *sd);
static int del_rules(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
struct sockopt_data *sd);
static int clear_rules(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
struct sockopt_data *sd);
static int move_rules(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
struct sockopt_data *sd);
static int manage_sets(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
struct sockopt_data *sd);
static int dump_soptcodes(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
struct sockopt_data *sd);
static int dump_srvobjects(struct ip_fw_chain *chain, ip_fw3_opheader *op3,
struct sockopt_data *sd);
/* ctl3 handler data */
struct mtx ctl3_lock;
#define CTL3_LOCK_INIT() mtx_init(&ctl3_lock, "ctl3_lock", NULL, MTX_DEF)
#define CTL3_LOCK_DESTROY() mtx_destroy(&ctl3_lock)
#define CTL3_LOCK() mtx_lock(&ctl3_lock)
#define CTL3_UNLOCK() mtx_unlock(&ctl3_lock)
static struct ipfw_sopt_handler *ctl3_handlers;
static size_t ctl3_hsize;
static uint64_t ctl3_refct, ctl3_gencnt;
#define CTL3_SMALLBUF 4096 /* small page-size write buffer */
#define CTL3_LARGEBUF 16 * 1024 * 1024 /* handle large rulesets */
static int ipfw_flush_sopt_data(struct sockopt_data *sd);
static struct ipfw_sopt_handler scodes[] = {
{ IP_FW_XGET, 0, HDIR_GET, dump_config },
{ IP_FW_XADD, 0, HDIR_BOTH, add_rules },
{ IP_FW_XDEL, 0, HDIR_BOTH, del_rules },
{ IP_FW_XZERO, 0, HDIR_SET, clear_rules },
{ IP_FW_XRESETLOG, 0, HDIR_SET, clear_rules },
{ IP_FW_XMOVE, 0, HDIR_SET, move_rules },
{ IP_FW_SET_SWAP, 0, HDIR_SET, manage_sets },
{ IP_FW_SET_MOVE, 0, HDIR_SET, manage_sets },
{ IP_FW_SET_ENABLE, 0, HDIR_SET, manage_sets },
{ IP_FW_DUMP_SOPTCODES, 0, HDIR_GET, dump_soptcodes },
{ IP_FW_DUMP_SRVOBJECTS,0, HDIR_GET, dump_srvobjects },
};
static int
set_legacy_obj_kidx(struct ip_fw_chain *ch, struct ip_fw_rule0 *rule);
static struct opcode_obj_rewrite *find_op_rw(ipfw_insn *cmd,
uint16_t *puidx, uint8_t *ptype);
static int mark_object_kidx(struct ip_fw_chain *ch, struct ip_fw *rule,
uint32_t *bmask);
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);
static int ref_opcode_object(struct ip_fw_chain *ch, ipfw_insn *cmd,
struct tid_info *ti, struct obj_idx *pidx, int *unresolved);
static void unref_rule_objects(struct ip_fw_chain *chain, struct ip_fw *rule);
static void unref_oib_objects(struct ip_fw_chain *ch, ipfw_insn *cmd,
struct obj_idx *oib, struct obj_idx *end);
static int export_objhash_ntlv(struct namedobj_instance *ni, uint16_t kidx,
struct sockopt_data *sd);
/*
* Opcode object rewriter variables
*/
struct opcode_obj_rewrite *ctl3_rewriters;
static size_t ctl3_rsize;
/*
* static variables followed by global ones
*/
static VNET_DEFINE(uma_zone_t, ipfw_cntr_zone);
#define V_ipfw_cntr_zone VNET(ipfw_cntr_zone)
void
ipfw_init_counters()
{
V_ipfw_cntr_zone = uma_zcreate("IPFW counters",
IPFW_RULE_CNTR_SIZE, NULL, NULL, NULL, NULL,
UMA_ALIGN_PTR, UMA_ZONE_PCPU);
}
void
ipfw_destroy_counters()
{
uma_zdestroy(V_ipfw_cntr_zone);
}
struct ip_fw *
ipfw_alloc_rule(struct ip_fw_chain *chain, size_t rulesize)
{
struct ip_fw *rule;
rule = malloc(rulesize, M_IPFW, M_WAITOK | M_ZERO);
rule->cntr = uma_zalloc(V_ipfw_cntr_zone, M_WAITOK | M_ZERO);
return (rule);
}
static void
free_rule(struct ip_fw *rule)
{
uma_zfree(V_ipfw_cntr_zone, rule->cntr);
free(rule, M_IPFW);
}
/*
* Find the smallest rule >= key, id.
* We could use bsearch but it is so simple that we code it directly
*/
int
ipfw_find_rule(struct ip_fw_chain *chain, uint32_t key, uint32_t id)
{
int i, lo, hi;
struct ip_fw *r;
for (lo = 0, hi = chain->n_rules - 1; lo < hi;) {
i = (lo + hi) / 2;
r = chain->map[i];
if (r->rulenum < key)
lo = i + 1; /* continue from the next one */
else if (r->rulenum > key)
hi = i; /* this might be good */
else if (r->id < id)
lo = i + 1; /* continue from the next one */
else /* r->id >= id */
hi = i; /* this might be good */
}
return hi;
}
/*
* Builds skipto cache on rule set @map.
*/
static void
update_skipto_cache(struct ip_fw_chain *chain, struct ip_fw **map)
{
int *smap, rulenum;
int i, mi;
IPFW_UH_WLOCK_ASSERT(chain);
mi = 0;
rulenum = map[mi]->rulenum;
smap = chain->idxmap_back;
if (smap == NULL)
return;
for (i = 0; i < 65536; i++) {
smap[i] = mi;
/* Use the same rule index until i < rulenum */
if (i != rulenum || i == 65535)
continue;
/* Find next rule with num > i */
rulenum = map[++mi]->rulenum;
while (rulenum == i)
rulenum = map[++mi]->rulenum;
}
}
/*
* Swaps prepared (backup) index with current one.
*/
static void
swap_skipto_cache(struct ip_fw_chain *chain)
{
int *map;
IPFW_UH_WLOCK_ASSERT(chain);
IPFW_WLOCK_ASSERT(chain);
map = chain->idxmap;
chain->idxmap = chain->idxmap_back;
chain->idxmap_back = map;
}
/*
* Allocate and initialize skipto cache.
*/
void
ipfw_init_skipto_cache(struct ip_fw_chain *chain)
{
int *idxmap, *idxmap_back;
idxmap = malloc(65536 * sizeof(uint32_t *), M_IPFW,
M_WAITOK | M_ZERO);
idxmap_back = malloc(65536 * sizeof(uint32_t *), M_IPFW,
M_WAITOK | M_ZERO);
/*
* Note we may be called at any time after initialization,
* for example, on first skipto rule, so we need to
* provide valid chain->idxmap on return
*/
IPFW_UH_WLOCK(chain);
if (chain->idxmap != NULL) {
IPFW_UH_WUNLOCK(chain);
free(idxmap, M_IPFW);
free(idxmap_back, M_IPFW);
return;
}
/* Set backup pointer first to permit building cache */
chain->idxmap_back = idxmap_back;
update_skipto_cache(chain, chain->map);
IPFW_WLOCK(chain);
/* It is now safe to set chain->idxmap ptr */
chain->idxmap = idxmap;
swap_skipto_cache(chain);
IPFW_WUNLOCK(chain);
IPFW_UH_WUNLOCK(chain);
}
/*
* Destroys skipto cache.
*/
void
ipfw_destroy_skipto_cache(struct ip_fw_chain *chain)
{
if (chain->idxmap != NULL)
free(chain->idxmap, M_IPFW);
if (chain->idxmap != NULL)
free(chain->idxmap_back, M_IPFW);
}
/*
* allocate a new map, returns the chain locked. extra is the number
* of entries to add or delete.
*/
static struct ip_fw **
get_map(struct ip_fw_chain *chain, int extra, int locked)
{
for (;;) {
struct ip_fw **map;
int i, mflags;
mflags = M_ZERO | ((locked != 0) ? M_NOWAIT : M_WAITOK);
i = chain->n_rules + extra;
map = malloc(i * sizeof(struct ip_fw *), M_IPFW, mflags);
if (map == NULL) {
printf("%s: cannot allocate map\n", __FUNCTION__);
return NULL;
}
if (!locked)
IPFW_UH_WLOCK(chain);
if (i >= chain->n_rules + extra) /* good */
return map;
/* otherwise we lost the race, free and retry */
if (!locked)
IPFW_UH_WUNLOCK(chain);
free(map, M_IPFW);
}
}
/*
* swap the maps. It is supposed to be called with IPFW_UH_WLOCK
*/
static struct ip_fw **
swap_map(struct ip_fw_chain *chain, struct ip_fw **new_map, int new_len)
{
struct ip_fw **old_map;
IPFW_WLOCK(chain);
chain->id++;
chain->n_rules = new_len;
old_map = chain->map;
chain->map = new_map;
swap_skipto_cache(chain);
IPFW_WUNLOCK(chain);
return old_map;
}
static void
export_cntr1_base(struct ip_fw *krule, struct ip_fw_bcounter *cntr)
{
cntr->size = sizeof(*cntr);
if (krule->cntr != NULL) {
cntr->pcnt = counter_u64_fetch(krule->cntr);
cntr->bcnt = counter_u64_fetch(krule->cntr + 1);
cntr->timestamp = krule->timestamp;
}
if (cntr->timestamp > 0)
cntr->timestamp += boottime.tv_sec;
}
static void
export_cntr0_base(struct ip_fw *krule, struct ip_fw_bcounter0 *cntr)
{
if (krule->cntr != NULL) {
cntr->pcnt = counter_u64_fetch(krule->cntr);
cntr->bcnt = counter_u64_fetch(krule->cntr + 1);
cntr->timestamp = krule->timestamp;
}
if (cntr->timestamp > 0)
cntr->timestamp += boottime.tv_sec;
}
/*
* Copies rule @urule from v1 userland format (current).
* to kernel @krule.
* Assume @krule is zeroed.
*/
static void
import_rule1(struct rule_check_info *ci)
{
struct ip_fw_rule *urule;
struct ip_fw *krule;
urule = (struct ip_fw_rule *)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;
krule->flags = urule->flags;
/* Save rulenum offset */
ci->urule_numoff = offsetof(struct ip_fw_rule, rulenum);
/* Copy opcodes */
memcpy(krule->cmd, urule->cmd, krule->cmd_len * sizeof(uint32_t));
}
/*
* Export rule into v1 format (Current).
* Layout:
* [ ipfw_obj_tlv(IPFW_TLV_RULE_ENT)
* [ ip_fw_rule ] OR
* [ ip_fw_bcounter ip_fw_rule] (depends on rcntrs).
* ]
* Assume @data is zeroed.
*/
static void
export_rule1(struct ip_fw *krule, caddr_t data, int len, int rcntrs)
{
struct ip_fw_bcounter *cntr;
struct ip_fw_rule *urule;
ipfw_obj_tlv *tlv;
/* Fill in TLV header */
tlv = (ipfw_obj_tlv *)data;
tlv->type = IPFW_TLV_RULE_ENT;
tlv->length = len;
if (rcntrs != 0) {
/* Copy counters */
cntr = (struct ip_fw_bcounter *)(tlv + 1);
urule = (struct ip_fw_rule *)(cntr + 1);
export_cntr1_base(krule, cntr);
} else
urule = (struct ip_fw_rule *)(tlv + 1);
/* copy header */
urule->act_ofs = krule->act_ofs;
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
* - @found to 1 if object was found and references
* - @unresolved to 1 if object should exists but not found
*
* Returns non-zero value in case of error.
*/
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 rule rewrite */
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_cfg_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 */
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