97219abf05
- move global variables around to reduce the scope and make them static if possible; - add an ipfw_ prefix to all public functions to prevent conflicts (the same should be done for variables); - try to pack variable declaration in an uniform way across files; - clarify some comments; - remove some misspelling of names (#define V_foo VNET(bar)) that slipped in due to cut&paste - remove duplicate static variables in different files; MFC after: 1 month
1102 lines
26 KiB
C
1102 lines
26 KiB
C
/*-
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* Copyright (c) 2002 Luigi Rizzo, Universita` di Pisa
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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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#define DEB(x)
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#define DDB(x) x
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/*
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* Sockopt support for ipfw. The routines here implement
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* the upper half of the ipfw code.
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*/
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#if !defined(KLD_MODULE)
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#include "opt_ipfw.h"
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#include "opt_ipdivert.h"
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#include "opt_ipdn.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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#endif
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#include "opt_inet6.h"
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#include "opt_ipsec.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/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/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 <net/if.h>
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#include <net/route.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/ip_fw.h>
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#include <netinet/ipfw/ip_fw_private.h>
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#include <netinet/ip_divert.h>
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#include <netgraph/ng_ipfw.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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MALLOC_DEFINE(M_IPFW, "IpFw/IpAcct", "IpFw/IpAcct chain's");
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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(u_int32_t, static_count); /* # of static rules */
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static VNET_DEFINE(u_int32_t, static_len); /* bytes of static rules */
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#define V_static_count VNET(static_count)
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#define V_static_len VNET(static_len)
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#ifdef SYSCTL_NODE
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SYSCTL_DECL(_net_inet_ip_fw);
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SYSCTL_VNET_INT(_net_inet_ip_fw, OID_AUTO, autoinc_step,
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CTLFLAG_RW, &VNET_NAME(autoinc_step), 0,
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"Rule number auto-increment step");
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SYSCTL_VNET_INT(_net_inet_ip_fw, OID_AUTO, static_count,
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CTLFLAG_RD, &VNET_NAME(static_count), 0,
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"Number of static rules");
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#endif /* SYSCTL_NODE */
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/*
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* When a rule is added/deleted, clear the next_rule pointers in all rules.
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* These will be reconstructed on the fly as packets are matched.
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*/
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static void
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flush_rule_ptrs(struct ip_fw_chain *chain)
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{
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struct ip_fw *rule;
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IPFW_WLOCK_ASSERT(chain);
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chain->id++;
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for (rule = chain->rules; rule; rule = rule->next)
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rule->next_rule = NULL;
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}
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/*
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* Add a new rule to the list. Copy the rule into a malloc'ed area, then
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* possibly create a rule number and add the rule to the list.
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* Update the rule_number in the input struct so the caller knows it as well.
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*/
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int
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ipfw_add_rule(struct ip_fw_chain *chain, struct ip_fw *input_rule)
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{
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struct ip_fw *rule, *f, *prev;
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int l = RULESIZE(input_rule);
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if (chain->rules == NULL && input_rule->rulenum != IPFW_DEFAULT_RULE)
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return (EINVAL);
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rule = malloc(l, M_IPFW, M_NOWAIT | M_ZERO);
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if (rule == NULL)
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return (ENOSPC);
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bcopy(input_rule, rule, l);
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rule->next = NULL;
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rule->next_rule = NULL;
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rule->pcnt = 0;
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rule->bcnt = 0;
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rule->timestamp = 0;
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IPFW_WLOCK(chain);
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if (chain->rules == NULL) { /* default rule */
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chain->rules = rule;
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rule->id = ++chain->id;
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goto done;
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}
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/*
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* If rulenum is 0, find highest numbered rule before the
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* default rule, and add autoinc_step
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*/
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if (V_autoinc_step < 1)
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V_autoinc_step = 1;
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else if (V_autoinc_step > 1000)
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V_autoinc_step = 1000;
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if (rule->rulenum == 0) {
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/*
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* locate the highest numbered rule before default
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*/
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for (f = chain->rules; f; f = f->next) {
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if (f->rulenum == IPFW_DEFAULT_RULE)
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break;
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rule->rulenum = f->rulenum;
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}
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if (rule->rulenum < IPFW_DEFAULT_RULE - V_autoinc_step)
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rule->rulenum += V_autoinc_step;
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input_rule->rulenum = rule->rulenum;
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}
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/*
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* Now insert the new rule in the right place in the sorted list.
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*/
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for (prev = NULL, f = chain->rules; f; prev = f, f = f->next) {
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if (f->rulenum > rule->rulenum) { /* found the location */
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if (prev) {
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rule->next = f;
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prev->next = rule;
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} else { /* head insert */
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rule->next = chain->rules;
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chain->rules = rule;
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}
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break;
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}
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}
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flush_rule_ptrs(chain);
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/* chain->id incremented inside flush_rule_ptrs() */
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rule->id = chain->id;
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done:
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V_static_count++;
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V_static_len += l;
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IPFW_WUNLOCK(chain);
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DEB(printf("ipfw: installed rule %d, static count now %d\n",
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rule->rulenum, V_static_count);)
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return (0);
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}
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/**
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* Remove a static rule (including derived * dynamic rules)
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* and place it on the ``reap list'' for later reclamation.
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* The caller is in charge of clearing rule pointers to avoid
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* dangling pointers.
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* @return a pointer to the next entry.
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* Arguments are not checked, so they better be correct.
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*/
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static struct ip_fw *
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remove_rule(struct ip_fw_chain *chain, struct ip_fw *rule,
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struct ip_fw *prev)
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{
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struct ip_fw *n;
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int l = RULESIZE(rule);
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IPFW_WLOCK_ASSERT(chain);
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n = rule->next;
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ipfw_remove_dyn_children(rule);
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if (prev == NULL)
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chain->rules = n;
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else
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prev->next = n;
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V_static_count--;
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V_static_len -= l;
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rule->next = chain->reap;
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chain->reap = rule;
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return n;
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}
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/*
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* Reclaim storage associated with a list of rules. This is
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* typically the list created using remove_rule.
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* A NULL pointer on input is handled correctly.
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*/
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void
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ipfw_reap_rules(struct ip_fw *head)
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{
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struct ip_fw *rule;
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while ((rule = head) != NULL) {
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head = head->next;
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free(rule, M_IPFW);
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}
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}
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/*
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* Remove all rules from a chain (except rules in set RESVD_SET
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* unless kill_default = 1). The caller is responsible for
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* reclaiming storage for the rules left in chain->reap.
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*/
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void
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ipfw_free_chain(struct ip_fw_chain *chain, int kill_default)
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{
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struct ip_fw *prev, *rule;
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IPFW_WLOCK_ASSERT(chain);
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chain->reap = NULL;
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flush_rule_ptrs(chain); /* more efficient to do outside the loop */
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for (prev = NULL, rule = chain->rules; rule ; )
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if (kill_default || rule->set != RESVD_SET)
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rule = remove_rule(chain, rule, prev);
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else {
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prev = rule;
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rule = rule->next;
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}
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}
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/**
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* Remove all rules with given number, and also do set manipulation.
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* Assumes chain != NULL && *chain != NULL.
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*
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* The argument is an u_int32_t. The low 16 bit are the rule or set number,
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* the next 8 bits are the new set, the top 8 bits are the command:
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*
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* 0 delete rules with given number
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* 1 delete rules with given set number
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* 2 move rules with given number to new set
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* 3 move rules with given set number to new set
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* 4 swap sets with given numbers
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* 5 delete rules with given number and with given set number
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*/
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static int
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del_entry(struct ip_fw_chain *chain, u_int32_t arg)
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{
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struct ip_fw *prev = NULL, *rule;
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u_int16_t rulenum; /* rule or old_set */
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u_int8_t cmd, new_set;
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rulenum = arg & 0xffff;
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cmd = (arg >> 24) & 0xff;
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new_set = (arg >> 16) & 0xff;
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if (cmd > 5 || new_set > RESVD_SET)
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return EINVAL;
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if (cmd == 0 || cmd == 2 || cmd == 5) {
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if (rulenum >= IPFW_DEFAULT_RULE)
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return EINVAL;
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} else {
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if (rulenum > RESVD_SET) /* old_set */
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return EINVAL;
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}
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IPFW_WLOCK(chain);
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rule = chain->rules; /* common starting point */
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chain->reap = NULL; /* prepare for deletions */
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switch (cmd) {
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case 0: /* delete rules with given number */
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/*
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* locate first rule to delete
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*/
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for (; rule->rulenum < rulenum; prev = rule, rule = rule->next)
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;
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if (rule->rulenum != rulenum) {
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IPFW_WUNLOCK(chain);
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return EINVAL;
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}
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/*
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* flush pointers outside the loop, then delete all matching
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* rules. prev remains the same throughout the cycle.
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*/
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flush_rule_ptrs(chain);
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while (rule->rulenum == rulenum)
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rule = remove_rule(chain, rule, prev);
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break;
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case 1: /* delete all rules with given set number */
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flush_rule_ptrs(chain);
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while (rule->rulenum < IPFW_DEFAULT_RULE) {
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if (rule->set == rulenum)
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rule = remove_rule(chain, rule, prev);
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else {
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prev = rule;
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rule = rule->next;
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}
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}
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break;
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case 2: /* move rules with given number to new set */
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for (; rule->rulenum < IPFW_DEFAULT_RULE; rule = rule->next)
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if (rule->rulenum == rulenum)
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rule->set = new_set;
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break;
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case 3: /* move rules with given set number to new set */
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for (; rule->rulenum < IPFW_DEFAULT_RULE; rule = rule->next)
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if (rule->set == rulenum)
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rule->set = new_set;
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break;
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case 4: /* swap two sets */
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for (; rule->rulenum < IPFW_DEFAULT_RULE; rule = rule->next)
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if (rule->set == rulenum)
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rule->set = new_set;
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else if (rule->set == new_set)
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rule->set = rulenum;
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break;
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case 5: /* delete rules with given number and with given set number.
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* rulenum - given rule number;
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* new_set - given set number.
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*/
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for (; rule->rulenum < rulenum; prev = rule, rule = rule->next)
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;
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if (rule->rulenum != rulenum) {
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IPFW_WUNLOCK(chain);
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return (EINVAL);
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}
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flush_rule_ptrs(chain);
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while (rule->rulenum == rulenum) {
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if (rule->set == new_set)
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rule = remove_rule(chain, rule, prev);
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else {
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prev = rule;
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rule = rule->next;
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}
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}
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}
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/*
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* Look for rules to reclaim. We grab the list before
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* releasing the lock then reclaim them w/o the lock to
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* avoid a LOR with dummynet.
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*/
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rule = chain->reap;
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IPFW_WUNLOCK(chain);
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ipfw_reap_rules(rule);
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return 0;
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}
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/*
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* Clear counters for a specific rule.
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* The enclosing "table" is assumed locked.
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*/
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static void
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clear_counters(struct ip_fw *rule, int log_only)
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{
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ipfw_insn_log *l = (ipfw_insn_log *)ACTION_PTR(rule);
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if (log_only == 0) {
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rule->bcnt = rule->pcnt = 0;
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rule->timestamp = 0;
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}
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if (l->o.opcode == O_LOG)
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l->log_left = l->max_log;
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}
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|
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/**
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* Reset some or all counters on firewall rules.
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* The argument `arg' is an u_int32_t. The low 16 bit are the rule number,
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* the next 8 bits are the set number, the top 8 bits are the command:
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* 0 work with rules from all set's;
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* 1 work with rules only from specified set.
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* Specified rule number is zero if we want to clear all entries.
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* log_only is 1 if we only want to reset logs, zero otherwise.
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*/
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static int
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zero_entry(struct ip_fw_chain *chain, u_int32_t arg, int log_only)
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{
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struct ip_fw *rule;
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char *msg;
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uint16_t rulenum = arg & 0xffff;
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uint8_t set = (arg >> 16) & 0xff;
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uint8_t cmd = (arg >> 24) & 0xff;
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if (cmd > 1)
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return (EINVAL);
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if (cmd == 1 && set > RESVD_SET)
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return (EINVAL);
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|
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IPFW_WLOCK(chain);
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if (rulenum == 0) {
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V_norule_counter = 0;
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for (rule = chain->rules; rule; rule = rule->next) {
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/* Skip rules from another set. */
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if (cmd == 1 && rule->set != set)
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continue;
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clear_counters(rule, log_only);
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}
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msg = log_only ? "All logging counts reset" :
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"Accounting cleared";
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} else {
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int cleared = 0;
|
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/*
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* We can have multiple rules with the same number, so we
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* need to clear them all.
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*/
|
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for (rule = chain->rules; rule; rule = rule->next)
|
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if (rule->rulenum == rulenum) {
|
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while (rule && rule->rulenum == rulenum) {
|
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if (cmd == 0 || rule->set == set)
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clear_counters(rule, log_only);
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rule = rule->next;
|
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}
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cleared = 1;
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break;
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}
|
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if (!cleared) { /* we did not find any matching rules */
|
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IPFW_WUNLOCK(chain);
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return (EINVAL);
|
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}
|
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msg = log_only ? "logging count reset" : "cleared";
|
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}
|
|
IPFW_WUNLOCK(chain);
|
|
|
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if (V_fw_verbose) {
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int lev = LOG_SECURITY | LOG_NOTICE;
|
|
|
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if (rulenum)
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log(lev, "ipfw: Entry %d %s.\n", rulenum, msg);
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else
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log(lev, "ipfw: %s.\n", msg);
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}
|
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return (0);
|
|
}
|
|
|
|
/*
|
|
* Check validity of the structure before insert.
|
|
* Rules are simple, so this mostly need to check rule sizes.
|
|
*/
|
|
static int
|
|
check_ipfw_struct(struct ip_fw *rule, int size)
|
|
{
|
|
int l, cmdlen = 0;
|
|
int have_action=0;
|
|
ipfw_insn *cmd;
|
|
|
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if (size < sizeof(*rule)) {
|
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printf("ipfw: rule too short\n");
|
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return (EINVAL);
|
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}
|
|
/* first, check for valid size */
|
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l = RULESIZE(rule);
|
|
if (l != size) {
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printf("ipfw: size mismatch (have %d want %d)\n", size, l);
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return (EINVAL);
|
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}
|
|
if (rule->act_ofs >= rule->cmd_len) {
|
|
printf("ipfw: bogus action offset (%u > %u)\n",
|
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rule->act_ofs, rule->cmd_len - 1);
|
|
return (EINVAL);
|
|
}
|
|
/*
|
|
* Now go for the individual checks. Very simple ones, basically only
|
|
* instruction sizes.
|
|
*/
|
|
for (l = rule->cmd_len, cmd = rule->cmd ;
|
|
l > 0 ; l -= cmdlen, cmd += cmdlen) {
|
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cmdlen = F_LEN(cmd);
|
|
if (cmdlen > l) {
|
|
printf("ipfw: opcode %d size truncated\n",
|
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cmd->opcode);
|
|
return EINVAL;
|
|
}
|
|
DEB(printf("ipfw: opcode %d\n", cmd->opcode);)
|
|
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_TCPWIN:
|
|
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 >= rt_numfibs) {
|
|
printf("ipfw: invalid fib number %d\n",
|
|
cmd->arg1);
|
|
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) || cmdlen > 31)
|
|
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 >= IPFW_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;
|
|
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_TAGGED:
|
|
if (cmdlen < 1 || cmdlen > 31)
|
|
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;
|
|
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:
|
|
#ifdef IPFIREWALL_FORWARD
|
|
if (cmdlen != F_INSN_SIZE(ipfw_insn_sa))
|
|
goto bad_size;
|
|
goto check_action;
|
|
#else
|
|
return EINVAL;
|
|
#endif
|
|
|
|
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_LOADED)
|
|
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:
|
|
#ifdef INET6
|
|
case O_UNREACH6:
|
|
#endif
|
|
case O_SKIPTO:
|
|
case O_REASS:
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* Copy the static and dynamic rules to the supplied buffer
|
|
* and return the amount of space actually used.
|
|
*/
|
|
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;
|
|
int i;
|
|
time_t boot_seconds;
|
|
|
|
boot_seconds = boottime.tv_sec;
|
|
/* XXX this can take a long time and locking will block packet flow */
|
|
IPFW_RLOCK(chain);
|
|
for (rule = chain->rules; rule ; rule = rule->next) {
|
|
/*
|
|
* Verify the entry fits in the buffer in case the
|
|
* rules changed between calculating buffer space and
|
|
* now. This would be better done using a generation
|
|
* number but should suffice for now.
|
|
*/
|
|
i = RULESIZE(rule);
|
|
if (bp + i <= ep) {
|
|
bcopy(rule, bp, i);
|
|
/*
|
|
* 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_fw *)bp)->next_rule),
|
|
sizeof(V_set_disable));
|
|
if (((struct ip_fw *)bp)->timestamp)
|
|
((struct ip_fw *)bp)->timestamp += boot_seconds;
|
|
bp += i;
|
|
}
|
|
}
|
|
IPFW_RUNLOCK(chain);
|
|
ipfw_get_dynamic(&bp, ep); /* protected by the dynamic lock */
|
|
return (bp - (char *)buf);
|
|
}
|
|
|
|
|
|
/**
|
|
* {set|get}sockopt parser.
|
|
*/
|
|
int
|
|
ipfw_ctl(struct sockopt *sopt)
|
|
{
|
|
#define RULE_MAXSIZE (256*sizeof(u_int32_t))
|
|
int error;
|
|
size_t size;
|
|
struct ip_fw *buf, *rule;
|
|
u_int32_t rulenum[2];
|
|
|
|
error = priv_check(sopt->sopt_td, PRIV_NETINET_IPFW);
|
|
if (error)
|
|
return (error);
|
|
|
|
/*
|
|
* Disallow modifications in really-really secure mode, but still allow
|
|
* the logging counters to be reset.
|
|
*/
|
|
if (sopt->sopt_name == IP_FW_ADD ||
|
|
(sopt->sopt_dir == SOPT_SET && sopt->sopt_name != IP_FW_RESETLOG)) {
|
|
error = securelevel_ge(sopt->sopt_td->td_ucred, 3);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
error = 0;
|
|
|
|
switch (sopt->sopt_name) {
|
|
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.
|
|
*/
|
|
size = V_static_len; /* size of static rules */
|
|
size += ipfw_dyn_len();
|
|
|
|
if (size >= sopt->sopt_valsize)
|
|
break;
|
|
/*
|
|
* XXX todo: if the user passes a short length just to know
|
|
* how much room is needed, do not bother filling up the
|
|
* buffer, just jump to the sooptcopyout.
|
|
*/
|
|
buf = malloc(size, M_TEMP, M_WAITOK);
|
|
error = sooptcopyout(sopt, buf,
|
|
ipfw_getrules(&V_layer3_chain, buf, size));
|
|
free(buf, M_TEMP);
|
|
break;
|
|
|
|
case IP_FW_FLUSH:
|
|
/*
|
|
* Normally we cannot release the lock on each iteration.
|
|
* We could do it here only because we start from the head all
|
|
* the times so there is no risk of missing some entries.
|
|
* On the other hand, the risk is that we end up with
|
|
* a very inconsistent ruleset, so better keep the lock
|
|
* around the whole cycle.
|
|
*
|
|
* XXX this code can be improved by resetting the head of
|
|
* the list to point to the default rule, and then freeing
|
|
* the old list without the need for a lock.
|
|
*/
|
|
|
|
IPFW_WLOCK(&V_layer3_chain);
|
|
ipfw_free_chain(&V_layer3_chain, 0 /* keep default rule */);
|
|
rule = V_layer3_chain.reap;
|
|
IPFW_WUNLOCK(&V_layer3_chain);
|
|
ipfw_reap_rules(rule);
|
|
break;
|
|
|
|
case IP_FW_ADD:
|
|
rule = malloc(RULE_MAXSIZE, M_TEMP, M_WAITOK);
|
|
error = sooptcopyin(sopt, rule, RULE_MAXSIZE,
|
|
sizeof(struct ip_fw) );
|
|
if (error == 0)
|
|
error = check_ipfw_struct(rule, sopt->sopt_valsize);
|
|
if (error == 0) {
|
|
error = ipfw_add_rule(&V_layer3_chain, rule);
|
|
size = RULESIZE(rule);
|
|
if (!error && sopt->sopt_dir == SOPT_GET)
|
|
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)) /* delete or reassign */
|
|
error = del_entry(&V_layer3_chain, rulenum[0]);
|
|
else if (size == 2*sizeof(u_int32_t)) /* set enable/disable */
|
|
V_set_disable =
|
|
(V_set_disable | rulenum[0]) & ~rulenum[1] &
|
|
~(1<<RESVD_SET); /* set RESVD_SET always enabled */
|
|
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(&V_layer3_chain, rulenum[0],
|
|
sopt->sopt_name == IP_FW_RESETLOG);
|
|
break;
|
|
|
|
case IP_FW_TABLE_ADD:
|
|
{
|
|
ipfw_table_entry ent;
|
|
|
|
error = sooptcopyin(sopt, &ent,
|
|
sizeof(ent), sizeof(ent));
|
|
if (error)
|
|
break;
|
|
error = ipfw_add_table_entry(&V_layer3_chain, ent.tbl,
|
|
ent.addr, ent.masklen, ent.value);
|
|
}
|
|
break;
|
|
|
|
case IP_FW_TABLE_DEL:
|
|
{
|
|
ipfw_table_entry ent;
|
|
|
|
error = sooptcopyin(sopt, &ent,
|
|
sizeof(ent), sizeof(ent));
|
|
if (error)
|
|
break;
|
|
error = ipfw_del_table_entry(&V_layer3_chain, ent.tbl,
|
|
ent.addr, ent.masklen);
|
|
}
|
|
break;
|
|
|
|
case IP_FW_TABLE_FLUSH:
|
|
{
|
|
u_int16_t tbl;
|
|
|
|
error = sooptcopyin(sopt, &tbl,
|
|
sizeof(tbl), sizeof(tbl));
|
|
if (error)
|
|
break;
|
|
IPFW_WLOCK(&V_layer3_chain);
|
|
error = ipfw_flush_table(&V_layer3_chain, tbl);
|
|
IPFW_WUNLOCK(&V_layer3_chain);
|
|
}
|
|
break;
|
|
|
|
case IP_FW_TABLE_GETSIZE:
|
|
{
|
|
u_int32_t tbl, cnt;
|
|
|
|
if ((error = sooptcopyin(sopt, &tbl, sizeof(tbl),
|
|
sizeof(tbl))))
|
|
break;
|
|
IPFW_RLOCK(&V_layer3_chain);
|
|
error = ipfw_count_table(&V_layer3_chain, tbl, &cnt);
|
|
IPFW_RUNLOCK(&V_layer3_chain);
|
|
if (error)
|
|
break;
|
|
error = sooptcopyout(sopt, &cnt, sizeof(cnt));
|
|
}
|
|
break;
|
|
|
|
case IP_FW_TABLE_LIST:
|
|
{
|
|
ipfw_table *tbl;
|
|
|
|
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);
|
|
IPFW_RLOCK(&V_layer3_chain);
|
|
error = ipfw_dump_table(&V_layer3_chain, tbl);
|
|
IPFW_RUNLOCK(&V_layer3_chain);
|
|
if (error) {
|
|
free(tbl, M_TEMP);
|
|
break;
|
|
}
|
|
error = sooptcopyout(sopt, tbl, size);
|
|
free(tbl, M_TEMP);
|
|
}
|
|
break;
|
|
|
|
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
|
|
}
|
|
/* end of file */
|