2 * Copyright (c) 2002 Luigi Rizzo, Universita` di Pisa
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * $FreeBSD: src/sys/netinet/ip_fw2.c,v 1.6.2.12 2003/04/08 10:42:32 maxim Exp $
29 * Implement IP packet firewall (new version)
35 #error IPFIREWALL requires INET.
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/malloc.h>
42 #include <sys/kernel.h>
44 #include <sys/socket.h>
45 #include <sys/socketvar.h>
46 #include <sys/sysctl.h>
47 #include <sys/syslog.h>
48 #include <sys/ucred.h>
49 #include <sys/in_cksum.h>
53 #include <net/route.h>
55 #include <net/dummynet/ip_dummynet.h>
57 #include <sys/thread2.h>
58 #include <sys/mplock2.h>
59 #include <net/netmsg2.h>
61 #include <netinet/in.h>
62 #include <netinet/in_systm.h>
63 #include <netinet/in_var.h>
64 #include <netinet/in_pcb.h>
65 #include <netinet/ip.h>
66 #include <netinet/ip_var.h>
67 #include <netinet/ip_icmp.h>
68 #include <netinet/tcp.h>
69 #include <netinet/tcp_timer.h>
70 #include <netinet/tcp_var.h>
71 #include <netinet/tcpip.h>
72 #include <netinet/udp.h>
73 #include <netinet/udp_var.h>
74 #include <netinet/ip_divert.h>
75 #include <netinet/if_ether.h> /* XXX for ETHERTYPE_IP */
77 #include <net/ipfw/ip_fw2.h>
79 #ifdef IPFIREWALL_DEBUG
80 #define DPRINTF(fmt, ...) \
83 kprintf(fmt, __VA_ARGS__); \
86 #define DPRINTF(fmt, ...) ((void)0)
90 * Description about per-CPU rule duplication:
92 * Module loading/unloading and all ioctl operations are serialized
93 * by netisr0, so we don't have any ordering or locking problems.
95 * Following graph shows how operation on per-CPU rule list is
96 * performed [2 CPU case]:
100 * netisr0 <------------------------------------+
111 * forwardmsg---------->ifnet1 |
116 * replymsg--------------+
121 * Rules which will not create states (dyn rules) [2 CPU case]
124 * layer3_chain layer3_chain
127 * +-------+ sibling +-------+ sibling
128 * | rule1 |--------->| rule1 |--------->NULL
129 * +-------+ +-------+
133 * +-------+ sibling +-------+ sibling
134 * | rule2 |--------->| rule2 |--------->NULL
135 * +-------+ +-------+
138 * 1) Ease statistics calculation during IP_FW_GET. We only need to
139 * iterate layer3_chain on CPU0; the current rule's duplication on
140 * the other CPUs could safely be read-only accessed by using
142 * 2) Accelerate rule insertion and deletion, e.g. rule insertion:
143 * a) In netisr0 (on CPU0) rule3 is determined to be inserted between
144 * rule1 and rule2. To make this decision we need to iterate the
145 * layer3_chain on CPU0. The netmsg, which is used to insert the
146 * rule, will contain rule1 on CPU0 as prev_rule and rule2 on CPU0
148 * b) After the insertion on CPU0 is done, we will move on to CPU1.
149 * But instead of relocating the rule3's position on CPU1 by
150 * iterating the layer3_chain on CPU1, we set the netmsg's prev_rule
151 * to rule1->sibling and next_rule to rule2->sibling before the
152 * netmsg is forwarded to CPU1 from CPU0
156 * Rules which will create states (dyn rules) [2 CPU case]
157 * (unnecessary parts are omitted; they are same as in the previous figure)
161 * +-------+ +-------+
162 * | rule1 | | rule1 |
163 * +-------+ +-------+
170 * | +--------------------+ |
172 * | | (read-only shared) | |
174 * | | back pointer array | |
175 * | | (indexed by cpuid) | |
177 * +----|---------[0] | |
178 * | [1]--------|----+
180 * +--------------------+
183 * ........|............|............
187 * : +---------+ +---------+ :
188 * : | state1a | | state1b | .... :
189 * : +---------+ +---------+ :
193 * : (protected by dyn_lock) :
194 * ..................................
196 * [state1a and state1b are states created by rule1]
199 * This structure is introduced so that shared (locked) state table could
200 * work with per-CPU (duplicated) static rules. It mainly bridges states
201 * and static rules and serves as static rule's place holder (a read-only
202 * shared part of duplicated rules) from states point of view.
204 * IPFW_RULE_F_STATE (only for rules which create states):
205 * o During rule installation, this flag is turned on after rule's
206 * duplications reach all CPUs, to avoid at least following race:
207 * 1) rule1 is duplicated on CPU0 and is not duplicated on CPU1 yet
208 * 2) rule1 creates state1
209 * 3) state1 is located on CPU1 by check-state
210 * But rule1 is not duplicated on CPU1 yet
211 * o During rule deletion, this flag is turned off before deleting states
212 * created by the rule and before deleting the rule itself, so no
213 * more states will be created by the to-be-deleted rule even when its
214 * duplication on certain CPUs are not eliminated yet.
217 #define IPFW_AUTOINC_STEP_MIN 1
218 #define IPFW_AUTOINC_STEP_MAX 1000
219 #define IPFW_AUTOINC_STEP_DEF 100
221 #define IPFW_DEFAULT_RULE 65535 /* rulenum for the default rule */
222 #define IPFW_DEFAULT_SET 31 /* set number for the default rule */
225 struct netmsg_base base;
226 const struct ipfw_ioc_rule *ioc_rule;
227 struct ip_fw *next_rule;
228 struct ip_fw *prev_rule;
229 struct ip_fw *sibling;
230 struct ip_fw_stub *stub;
234 struct netmsg_base base;
235 struct ip_fw *start_rule;
236 struct ip_fw *prev_rule;
243 struct netmsg_base base;
244 struct ip_fw *start_rule;
249 struct ipfw_context {
250 struct ip_fw *ipfw_layer3_chain; /* list of rules for layer3 */
251 struct ip_fw *ipfw_default_rule; /* default rule */
252 uint64_t ipfw_norule_counter; /* counter for ipfw_log(NULL) */
255 * ipfw_set_disable contains one bit per set value (0..31).
256 * If the bit is set, all rules with the corresponding set
257 * are disabled. Set IPDW_DEFAULT_SET is reserved for the
258 * default rule and CANNOT be disabled.
260 uint32_t ipfw_set_disable;
261 uint32_t ipfw_gen; /* generation of rule list */
264 static struct ipfw_context *ipfw_ctx[MAXCPU];
268 * Module can not be unloaded, if there are references to
269 * certains rules of ipfw(4), e.g. dummynet(4)
271 static int ipfw_refcnt;
274 MALLOC_DEFINE(M_IPFW, "IpFw/IpAcct", "IpFw/IpAcct chain's");
277 * Following two global variables are accessed and
278 * updated only on CPU0
280 static uint32_t static_count; /* # of static rules */
281 static uint32_t static_ioc_len; /* bytes of static rules */
284 * If 1, then ipfw static rules are being flushed,
285 * ipfw_chk() will skip to the default rule.
287 static int ipfw_flushing;
289 static int fw_verbose;
290 static int verbose_limit;
293 static int autoinc_step = IPFW_AUTOINC_STEP_DEF;
295 static int ipfw_sysctl_enable(SYSCTL_HANDLER_ARGS);
296 static int ipfw_sysctl_autoinc_step(SYSCTL_HANDLER_ARGS);
297 static int ipfw_sysctl_dyn_buckets(SYSCTL_HANDLER_ARGS);
298 static int ipfw_sysctl_dyn_fin(SYSCTL_HANDLER_ARGS);
299 static int ipfw_sysctl_dyn_rst(SYSCTL_HANDLER_ARGS);
301 SYSCTL_NODE(_net_inet_ip, OID_AUTO, fw, CTLFLAG_RW, 0, "Firewall");
302 SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, enable, CTLTYPE_INT | CTLFLAG_RW,
303 &fw_enable, 0, ipfw_sysctl_enable, "I", "Enable ipfw");
304 SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, autoinc_step, CTLTYPE_INT | CTLFLAG_RW,
305 &autoinc_step, 0, ipfw_sysctl_autoinc_step, "I",
306 "Rule number autincrement step");
307 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO,one_pass,CTLFLAG_RW,
309 "Only do a single pass through ipfw when using dummynet(4)");
310 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, debug, CTLFLAG_RW,
311 &fw_debug, 0, "Enable printing of debug ip_fw statements");
312 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, verbose, CTLFLAG_RW,
313 &fw_verbose, 0, "Log matches to ipfw rules");
314 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, verbose_limit, CTLFLAG_RW,
315 &verbose_limit, 0, "Set upper limit of matches of ipfw rules logged");
318 * Description of dynamic rules.
320 * Dynamic rules are stored in lists accessed through a hash table
321 * (ipfw_dyn_v) whose size is curr_dyn_buckets. This value can
322 * be modified through the sysctl variable dyn_buckets which is
323 * updated when the table becomes empty.
325 * XXX currently there is only one list, ipfw_dyn.
327 * When a packet is received, its address fields are first masked
328 * with the mask defined for the rule, then hashed, then matched
329 * against the entries in the corresponding list.
330 * Dynamic rules can be used for different purposes:
332 * + enforcing limits on the number of sessions;
333 * + in-kernel NAT (not implemented yet)
335 * The lifetime of dynamic rules is regulated by dyn_*_lifetime,
336 * measured in seconds and depending on the flags.
338 * The total number of dynamic rules is stored in dyn_count.
339 * The max number of dynamic rules is dyn_max. When we reach
340 * the maximum number of rules we do not create anymore. This is
341 * done to avoid consuming too much memory, but also too much
342 * time when searching on each packet (ideally, we should try instead
343 * to put a limit on the length of the list on each bucket...).
345 * Each dynamic rule holds a pointer to the parent ipfw rule so
346 * we know what action to perform. Dynamic rules are removed when
347 * the parent rule is deleted. XXX we should make them survive.
349 * There are some limitations with dynamic rules -- we do not
350 * obey the 'randomized match', and we do not do multiple
351 * passes through the firewall. XXX check the latter!!!
353 * NOTE about the SHARED LOCKMGR LOCK during dynamic rule looking up:
354 * Only TCP state transition will change dynamic rule's state and ack
355 * sequences, while all packets of one TCP connection only goes through
356 * one TCP thread, so it is safe to use shared lockmgr lock during dynamic
357 * rule looking up. The keep alive callout uses exclusive lockmgr lock
358 * when it tries to find suitable dynamic rules to send keep alive, so
359 * it will not see half updated state and ack sequences. Though the expire
360 * field updating looks racy for other protocols, the resolution (second)
361 * of expire field makes this kind of race harmless.
362 * XXX statistics' updating is _not_ MPsafe!!!
363 * XXX once UDP output path is fixed, we could use lockless dynamic rule
366 static ipfw_dyn_rule **ipfw_dyn_v = NULL;
367 static uint32_t dyn_buckets = 256; /* must be power of 2 */
368 static uint32_t curr_dyn_buckets = 256; /* must be power of 2 */
369 static uint32_t dyn_buckets_gen; /* generation of dyn buckets array */
370 static struct lock dyn_lock; /* dynamic rules' hash table lock */
372 static struct netmsg_base ipfw_timeout_netmsg; /* schedule ipfw timeout */
373 static struct callout ipfw_timeout_h;
376 * Timeouts for various events in handing dynamic rules.
378 static uint32_t dyn_ack_lifetime = 300;
379 static uint32_t dyn_syn_lifetime = 20;
380 static uint32_t dyn_fin_lifetime = 1;
381 static uint32_t dyn_rst_lifetime = 1;
382 static uint32_t dyn_udp_lifetime = 10;
383 static uint32_t dyn_short_lifetime = 5;
386 * Keepalives are sent if dyn_keepalive is set. They are sent every
387 * dyn_keepalive_period seconds, in the last dyn_keepalive_interval
388 * seconds of lifetime of a rule.
389 * dyn_rst_lifetime and dyn_fin_lifetime should be strictly lower
390 * than dyn_keepalive_period.
393 static uint32_t dyn_keepalive_interval = 20;
394 static uint32_t dyn_keepalive_period = 5;
395 static uint32_t dyn_keepalive = 1; /* do send keepalives */
397 static uint32_t dyn_count; /* # of dynamic rules */
398 static uint32_t dyn_max = 4096; /* max # of dynamic rules */
400 SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, dyn_buckets, CTLTYPE_INT | CTLFLAG_RW,
401 &dyn_buckets, 0, ipfw_sysctl_dyn_buckets, "I", "Number of dyn. buckets");
402 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, curr_dyn_buckets, CTLFLAG_RD,
403 &curr_dyn_buckets, 0, "Current Number of dyn. buckets");
404 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_count, CTLFLAG_RD,
405 &dyn_count, 0, "Number of dyn. rules");
406 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_max, CTLFLAG_RW,
407 &dyn_max, 0, "Max number of dyn. rules");
408 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, static_count, CTLFLAG_RD,
409 &static_count, 0, "Number of static rules");
410 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_ack_lifetime, CTLFLAG_RW,
411 &dyn_ack_lifetime, 0, "Lifetime of dyn. rules for acks");
412 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_syn_lifetime, CTLFLAG_RW,
413 &dyn_syn_lifetime, 0, "Lifetime of dyn. rules for syn");
414 SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, dyn_fin_lifetime,
415 CTLTYPE_INT | CTLFLAG_RW, &dyn_fin_lifetime, 0, ipfw_sysctl_dyn_fin, "I",
416 "Lifetime of dyn. rules for fin");
417 SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, dyn_rst_lifetime,
418 CTLTYPE_INT | CTLFLAG_RW, &dyn_rst_lifetime, 0, ipfw_sysctl_dyn_rst, "I",
419 "Lifetime of dyn. rules for rst");
420 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_udp_lifetime, CTLFLAG_RW,
421 &dyn_udp_lifetime, 0, "Lifetime of dyn. rules for UDP");
422 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_short_lifetime, CTLFLAG_RW,
423 &dyn_short_lifetime, 0, "Lifetime of dyn. rules for other situations");
424 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_keepalive, CTLFLAG_RW,
425 &dyn_keepalive, 0, "Enable keepalives for dyn. rules");
427 static ip_fw_chk_t ipfw_chk;
428 static void ipfw_tick(void *);
431 ipfw_free_rule(struct ip_fw *rule)
433 KASSERT(rule->cpuid == mycpuid, ("rule freed on cpu%d", mycpuid));
434 KASSERT(rule->refcnt > 0, ("invalid refcnt %u", rule->refcnt));
436 if (rule->refcnt == 0) {
444 ipfw_unref_rule(void *priv)
446 ipfw_free_rule(priv);
448 atomic_subtract_int(&ipfw_refcnt, 1);
453 ipfw_ref_rule(struct ip_fw *rule)
455 KASSERT(rule->cpuid == mycpuid, ("rule used on cpu%d", mycpuid));
457 atomic_add_int(&ipfw_refcnt, 1);
463 * This macro maps an ip pointer into a layer3 header pointer of type T
465 #define L3HDR(T, ip) ((T *)((uint32_t *)(ip) + (ip)->ip_hl))
468 icmptype_match(struct ip *ip, ipfw_insn_u32 *cmd)
470 int type = L3HDR(struct icmp,ip)->icmp_type;
472 return (type <= ICMP_MAXTYPE && (cmd->d[0] & (1 << type)));
475 #define TT ((1 << ICMP_ECHO) | \
476 (1 << ICMP_ROUTERSOLICIT) | \
477 (1 << ICMP_TSTAMP) | \
482 is_icmp_query(struct ip *ip)
484 int type = L3HDR(struct icmp, ip)->icmp_type;
486 return (type <= ICMP_MAXTYPE && (TT & (1 << type)));
492 * The following checks use two arrays of 8 or 16 bits to store the
493 * bits that we want set or clear, respectively. They are in the
494 * low and high half of cmd->arg1 or cmd->d[0].
496 * We scan options and store the bits we find set. We succeed if
498 * (want_set & ~bits) == 0 && (want_clear & ~bits) == want_clear
500 * The code is sometimes optimized not to store additional variables.
504 flags_match(ipfw_insn *cmd, uint8_t bits)
509 if (((cmd->arg1 & 0xff) & bits) != 0)
510 return 0; /* some bits we want set were clear */
512 want_clear = (cmd->arg1 >> 8) & 0xff;
513 if ((want_clear & bits) != want_clear)
514 return 0; /* some bits we want clear were set */
519 ipopts_match(struct ip *ip, ipfw_insn *cmd)
521 int optlen, bits = 0;
522 u_char *cp = (u_char *)(ip + 1);
523 int x = (ip->ip_hl << 2) - sizeof(struct ip);
525 for (; x > 0; x -= optlen, cp += optlen) {
526 int opt = cp[IPOPT_OPTVAL];
528 if (opt == IPOPT_EOL)
531 if (opt == IPOPT_NOP) {
534 optlen = cp[IPOPT_OLEN];
535 if (optlen <= 0 || optlen > x)
536 return 0; /* invalid or truncated */
541 bits |= IP_FW_IPOPT_LSRR;
545 bits |= IP_FW_IPOPT_SSRR;
549 bits |= IP_FW_IPOPT_RR;
553 bits |= IP_FW_IPOPT_TS;
560 return (flags_match(cmd, bits));
564 tcpopts_match(struct ip *ip, ipfw_insn *cmd)
566 int optlen, bits = 0;
567 struct tcphdr *tcp = L3HDR(struct tcphdr,ip);
568 u_char *cp = (u_char *)(tcp + 1);
569 int x = (tcp->th_off << 2) - sizeof(struct tcphdr);
571 for (; x > 0; x -= optlen, cp += optlen) {
574 if (opt == TCPOPT_EOL)
577 if (opt == TCPOPT_NOP) {
587 bits |= IP_FW_TCPOPT_MSS;
591 bits |= IP_FW_TCPOPT_WINDOW;
594 case TCPOPT_SACK_PERMITTED:
596 bits |= IP_FW_TCPOPT_SACK;
599 case TCPOPT_TIMESTAMP:
600 bits |= IP_FW_TCPOPT_TS;
606 bits |= IP_FW_TCPOPT_CC;
613 return (flags_match(cmd, bits));
617 iface_match(struct ifnet *ifp, ipfw_insn_if *cmd)
619 if (ifp == NULL) /* no iface with this packet, match fails */
622 /* Check by name or by IP address */
623 if (cmd->name[0] != '\0') { /* match by name */
626 if (kfnmatch(cmd->name, ifp->if_xname, 0) == 0)
629 if (strncmp(ifp->if_xname, cmd->name, IFNAMSIZ) == 0)
633 struct ifaddr_container *ifac;
635 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
636 struct ifaddr *ia = ifac->ifa;
638 if (ia->ifa_addr == NULL)
640 if (ia->ifa_addr->sa_family != AF_INET)
642 if (cmd->p.ip.s_addr == ((struct sockaddr_in *)
643 (ia->ifa_addr))->sin_addr.s_addr)
644 return(1); /* match */
647 return(0); /* no match, fail ... */
650 #define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0
653 * We enter here when we have a rule with O_LOG.
654 * XXX this function alone takes about 2Kbytes of code!
657 ipfw_log(struct ip_fw *f, u_int hlen, struct ether_header *eh,
658 struct mbuf *m, struct ifnet *oif)
661 int limit_reached = 0;
662 char action2[40], proto[48], fragment[28];
667 if (f == NULL) { /* bogus pkt */
668 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
670 if (verbose_limit != 0 &&
671 ctx->ipfw_norule_counter >= verbose_limit)
673 ctx->ipfw_norule_counter++;
674 if (ctx->ipfw_norule_counter == verbose_limit)
675 limit_reached = verbose_limit;
677 } else { /* O_LOG is the first action, find the real one */
678 ipfw_insn *cmd = ACTION_PTR(f);
679 ipfw_insn_log *l = (ipfw_insn_log *)cmd;
681 if (l->max_log != 0 && l->log_left == 0)
684 if (l->log_left == 0)
685 limit_reached = l->max_log;
686 cmd += F_LEN(cmd); /* point to first action */
687 if (cmd->opcode == O_PROB)
691 switch (cmd->opcode) {
697 if (cmd->arg1==ICMP_REJECT_RST) {
699 } else if (cmd->arg1==ICMP_UNREACH_HOST) {
702 ksnprintf(SNPARGS(action2, 0), "Unreach %d",
716 ksnprintf(SNPARGS(action2, 0), "Divert %d", cmd->arg1);
720 ksnprintf(SNPARGS(action2, 0), "Tee %d", cmd->arg1);
724 ksnprintf(SNPARGS(action2, 0), "SkipTo %d", cmd->arg1);
728 ksnprintf(SNPARGS(action2, 0), "Pipe %d", cmd->arg1);
732 ksnprintf(SNPARGS(action2, 0), "Queue %d", cmd->arg1);
737 ipfw_insn_sa *sa = (ipfw_insn_sa *)cmd;
740 len = ksnprintf(SNPARGS(action2, 0),
742 inet_ntoa(sa->sa.sin_addr));
743 if (sa->sa.sin_port) {
744 ksnprintf(SNPARGS(action2, len), ":%d",
756 if (hlen == 0) { /* non-ip */
757 ksnprintf(SNPARGS(proto, 0), "MAC");
759 struct ip *ip = mtod(m, struct ip *);
760 /* these three are all aliases to the same thing */
761 struct icmp *const icmp = L3HDR(struct icmp, ip);
762 struct tcphdr *const tcp = (struct tcphdr *)icmp;
763 struct udphdr *const udp = (struct udphdr *)icmp;
765 int ip_off, offset, ip_len;
768 if (eh != NULL) { /* layer 2 packets are as on the wire */
769 ip_off = ntohs(ip->ip_off);
770 ip_len = ntohs(ip->ip_len);
775 offset = ip_off & IP_OFFMASK;
778 len = ksnprintf(SNPARGS(proto, 0), "TCP %s",
779 inet_ntoa(ip->ip_src));
781 ksnprintf(SNPARGS(proto, len), ":%d %s:%d",
782 ntohs(tcp->th_sport),
783 inet_ntoa(ip->ip_dst),
784 ntohs(tcp->th_dport));
786 ksnprintf(SNPARGS(proto, len), " %s",
787 inet_ntoa(ip->ip_dst));
792 len = ksnprintf(SNPARGS(proto, 0), "UDP %s",
793 inet_ntoa(ip->ip_src));
795 ksnprintf(SNPARGS(proto, len), ":%d %s:%d",
796 ntohs(udp->uh_sport),
797 inet_ntoa(ip->ip_dst),
798 ntohs(udp->uh_dport));
800 ksnprintf(SNPARGS(proto, len), " %s",
801 inet_ntoa(ip->ip_dst));
807 len = ksnprintf(SNPARGS(proto, 0),
812 len = ksnprintf(SNPARGS(proto, 0), "ICMP ");
814 len += ksnprintf(SNPARGS(proto, len), "%s",
815 inet_ntoa(ip->ip_src));
816 ksnprintf(SNPARGS(proto, len), " %s",
817 inet_ntoa(ip->ip_dst));
821 len = ksnprintf(SNPARGS(proto, 0), "P:%d %s", ip->ip_p,
822 inet_ntoa(ip->ip_src));
823 ksnprintf(SNPARGS(proto, len), " %s",
824 inet_ntoa(ip->ip_dst));
828 if (ip_off & (IP_MF | IP_OFFMASK)) {
829 ksnprintf(SNPARGS(fragment, 0), " (frag %d:%d@%d%s)",
830 ntohs(ip->ip_id), ip_len - (ip->ip_hl << 2),
831 offset << 3, (ip_off & IP_MF) ? "+" : "");
835 if (oif || m->m_pkthdr.rcvif) {
836 log(LOG_SECURITY | LOG_INFO,
837 "ipfw: %d %s %s %s via %s%s\n",
839 action, proto, oif ? "out" : "in",
840 oif ? oif->if_xname : m->m_pkthdr.rcvif->if_xname,
843 log(LOG_SECURITY | LOG_INFO,
844 "ipfw: %d %s %s [no if info]%s\n",
846 action, proto, fragment);
850 log(LOG_SECURITY | LOG_NOTICE,
851 "ipfw: limit %d reached on entry %d\n",
852 limit_reached, f ? f->rulenum : -1);
859 * IMPORTANT: the hash function for dynamic rules must be commutative
860 * in source and destination (ip,port), because rules are bidirectional
861 * and we want to find both in the same bucket.
864 hash_packet(struct ipfw_flow_id *id)
868 i = (id->dst_ip) ^ (id->src_ip) ^ (id->dst_port) ^ (id->src_port);
869 i &= (curr_dyn_buckets - 1);
874 * unlink a dynamic rule from a chain. prev is a pointer to
875 * the previous one, q is a pointer to the rule to delete,
876 * head is a pointer to the head of the queue.
877 * Modifies q and potentially also head.
879 #define UNLINK_DYN_RULE(prev, head, q) \
881 ipfw_dyn_rule *old_q = q; \
883 /* remove a refcount to the parent */ \
884 if (q->dyn_type == O_LIMIT) \
885 q->parent->count--; \
886 DPRINTF("-- unlink entry 0x%08x %d -> 0x%08x %d, %d left\n", \
887 q->id.src_ip, q->id.src_port, \
888 q->id.dst_ip, q->id.dst_port, dyn_count - 1); \
890 prev->next = q = q->next; \
892 head = q = q->next; \
893 KASSERT(dyn_count > 0, ("invalid dyn count %u", dyn_count)); \
895 kfree(old_q, M_IPFW); \
898 #define TIME_LEQ(a, b) ((int)((a) - (b)) <= 0)
901 * Remove dynamic rules pointing to "rule", or all of them if rule == NULL.
903 * If keep_me == NULL, rules are deleted even if not expired,
904 * otherwise only expired rules are removed.
906 * The value of the second parameter is also used to point to identify
907 * a rule we absolutely do not want to remove (e.g. because we are
908 * holding a reference to it -- this is the case with O_LIMIT_PARENT
909 * rules). The pointer is only used for comparison, so any non-null
913 remove_dyn_rule_locked(struct ip_fw *rule, ipfw_dyn_rule *keep_me)
915 static uint32_t last_remove = 0; /* XXX */
917 #define FORCE (keep_me == NULL)
919 ipfw_dyn_rule *prev, *q;
920 int i, pass = 0, max_pass = 0, unlinked = 0;
922 if (ipfw_dyn_v == NULL || dyn_count == 0)
924 /* do not expire more than once per second, it is useless */
925 if (!FORCE && last_remove == time_second)
927 last_remove = time_second;
930 * because O_LIMIT refer to parent rules, during the first pass only
931 * remove child and mark any pending LIMIT_PARENT, and remove
932 * them in a second pass.
935 for (i = 0; i < curr_dyn_buckets; i++) {
936 for (prev = NULL, q = ipfw_dyn_v[i]; q;) {
938 * Logic can become complex here, so we split tests.
942 if (rule != NULL && rule->stub != q->stub)
943 goto next; /* not the one we are looking for */
944 if (q->dyn_type == O_LIMIT_PARENT) {
946 * handle parent in the second pass,
947 * record we need one.
952 if (FORCE && q->count != 0) {
953 /* XXX should not happen! */
954 kprintf("OUCH! cannot remove rule, "
955 "count %d\n", q->count);
958 if (!FORCE && !TIME_LEQ(q->expire, time_second))
962 UNLINK_DYN_RULE(prev, ipfw_dyn_v[i], q);
969 if (pass++ < max_pass)
979 * lookup a dynamic rule.
981 static ipfw_dyn_rule *
982 lookup_dyn_rule(struct ipfw_flow_id *pkt, int *match_direction,
986 * stateful ipfw extensions.
987 * Lookup into dynamic session queue
989 #define MATCH_REVERSE 0
990 #define MATCH_FORWARD 1
992 #define MATCH_UNKNOWN 3
993 int i, dir = MATCH_NONE;
994 ipfw_dyn_rule *prev, *q=NULL;
996 if (ipfw_dyn_v == NULL)
997 goto done; /* not found */
999 i = hash_packet(pkt);
1000 for (prev = NULL, q = ipfw_dyn_v[i]; q != NULL;) {
1001 if (q->dyn_type == O_LIMIT_PARENT)
1004 if (TIME_LEQ(q->expire, time_second)) {
1006 * Entry expired; skip.
1007 * Let ipfw_tick() take care of it
1012 if (pkt->proto == q->id.proto) {
1013 if (pkt->src_ip == q->id.src_ip &&
1014 pkt->dst_ip == q->id.dst_ip &&
1015 pkt->src_port == q->id.src_port &&
1016 pkt->dst_port == q->id.dst_port) {
1017 dir = MATCH_FORWARD;
1020 if (pkt->src_ip == q->id.dst_ip &&
1021 pkt->dst_ip == q->id.src_ip &&
1022 pkt->src_port == q->id.dst_port &&
1023 pkt->dst_port == q->id.src_port) {
1024 dir = MATCH_REVERSE;
1033 goto done; /* q = NULL, not found */
1035 if (pkt->proto == IPPROTO_TCP) { /* update state according to flags */
1036 u_char flags = pkt->flags & (TH_FIN|TH_SYN|TH_RST);
1038 #define BOTH_SYN (TH_SYN | (TH_SYN << 8))
1039 #define BOTH_FIN (TH_FIN | (TH_FIN << 8))
1041 q->state |= (dir == MATCH_FORWARD ) ? flags : (flags << 8);
1043 case TH_SYN: /* opening */
1044 q->expire = time_second + dyn_syn_lifetime;
1047 case BOTH_SYN: /* move to established */
1048 case BOTH_SYN | TH_FIN : /* one side tries to close */
1049 case BOTH_SYN | (TH_FIN << 8) :
1051 uint32_t ack = ntohl(tcp->th_ack);
1053 #define _SEQ_GE(a, b) ((int)(a) - (int)(b) >= 0)
1055 if (dir == MATCH_FORWARD) {
1056 if (q->ack_fwd == 0 ||
1057 _SEQ_GE(ack, q->ack_fwd))
1059 else /* ignore out-of-sequence */
1062 if (q->ack_rev == 0 ||
1063 _SEQ_GE(ack, q->ack_rev))
1065 else /* ignore out-of-sequence */
1070 q->expire = time_second + dyn_ack_lifetime;
1073 case BOTH_SYN | BOTH_FIN: /* both sides closed */
1074 KKASSERT(dyn_fin_lifetime < dyn_keepalive_period);
1075 q->expire = time_second + dyn_fin_lifetime;
1081 * reset or some invalid combination, but can also
1082 * occur if we use keep-state the wrong way.
1084 if ((q->state & ((TH_RST << 8) | TH_RST)) == 0)
1085 kprintf("invalid state: 0x%x\n", q->state);
1087 KKASSERT(dyn_rst_lifetime < dyn_keepalive_period);
1088 q->expire = time_second + dyn_rst_lifetime;
1091 } else if (pkt->proto == IPPROTO_UDP) {
1092 q->expire = time_second + dyn_udp_lifetime;
1094 /* other protocols */
1095 q->expire = time_second + dyn_short_lifetime;
1098 if (match_direction)
1099 *match_direction = dir;
1103 static struct ip_fw *
1104 lookup_rule(struct ipfw_flow_id *pkt, int *match_direction, struct tcphdr *tcp,
1105 uint16_t len, int *deny)
1107 struct ip_fw *rule = NULL;
1109 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
1113 gen = ctx->ipfw_gen;
1115 lockmgr(&dyn_lock, LK_SHARED);
1117 if (ctx->ipfw_gen != gen) {
1119 * Static rules had been change when we were waiting
1120 * for the dynamic hash table lock; deny this packet,
1121 * since it is _not_ known whether it is safe to keep
1122 * iterating the static rules.
1128 q = lookup_dyn_rule(pkt, match_direction, tcp);
1132 rule = q->stub->rule[mycpuid];
1133 KKASSERT(rule->stub == q->stub && rule->cpuid == mycpuid);
1140 lockmgr(&dyn_lock, LK_RELEASE);
1145 realloc_dynamic_table(void)
1147 ipfw_dyn_rule **old_dyn_v;
1148 uint32_t old_curr_dyn_buckets;
1150 KASSERT(dyn_buckets <= 65536 && (dyn_buckets & (dyn_buckets - 1)) == 0,
1151 ("invalid dyn_buckets %d", dyn_buckets));
1153 /* Save the current buckets array for later error recovery */
1154 old_dyn_v = ipfw_dyn_v;
1155 old_curr_dyn_buckets = curr_dyn_buckets;
1157 curr_dyn_buckets = dyn_buckets;
1159 ipfw_dyn_v = kmalloc(curr_dyn_buckets * sizeof(ipfw_dyn_rule *),
1160 M_IPFW, M_NOWAIT | M_ZERO);
1161 if (ipfw_dyn_v != NULL || curr_dyn_buckets <= 2)
1164 curr_dyn_buckets /= 2;
1165 if (curr_dyn_buckets <= old_curr_dyn_buckets &&
1166 old_dyn_v != NULL) {
1168 * Don't try allocating smaller buckets array, reuse
1169 * the old one, which alreay contains enough buckets
1175 if (ipfw_dyn_v != NULL) {
1176 if (old_dyn_v != NULL)
1177 kfree(old_dyn_v, M_IPFW);
1179 /* Allocation failed, restore old buckets array */
1180 ipfw_dyn_v = old_dyn_v;
1181 curr_dyn_buckets = old_curr_dyn_buckets;
1184 if (ipfw_dyn_v != NULL)
1189 * Install state of type 'type' for a dynamic session.
1190 * The hash table contains two type of rules:
1191 * - regular rules (O_KEEP_STATE)
1192 * - rules for sessions with limited number of sess per user
1193 * (O_LIMIT). When they are created, the parent is
1194 * increased by 1, and decreased on delete. In this case,
1195 * the third parameter is the parent rule and not the chain.
1196 * - "parent" rules for the above (O_LIMIT_PARENT).
1198 static ipfw_dyn_rule *
1199 add_dyn_rule(struct ipfw_flow_id *id, uint8_t dyn_type, struct ip_fw *rule)
1204 if (ipfw_dyn_v == NULL ||
1205 (dyn_count == 0 && dyn_buckets != curr_dyn_buckets)) {
1206 realloc_dynamic_table();
1207 if (ipfw_dyn_v == NULL)
1208 return NULL; /* failed ! */
1210 i = hash_packet(id);
1212 r = kmalloc(sizeof(*r), M_IPFW, M_NOWAIT | M_ZERO);
1214 kprintf ("sorry cannot allocate state\n");
1218 /* increase refcount on parent, and set pointer */
1219 if (dyn_type == O_LIMIT) {
1220 ipfw_dyn_rule *parent = (ipfw_dyn_rule *)rule;
1222 if (parent->dyn_type != O_LIMIT_PARENT)
1223 panic("invalid parent");
1226 rule = parent->stub->rule[mycpuid];
1227 KKASSERT(rule->stub == parent->stub);
1229 KKASSERT(rule->cpuid == mycpuid && rule->stub != NULL);
1232 r->expire = time_second + dyn_syn_lifetime;
1233 r->stub = rule->stub;
1234 r->dyn_type = dyn_type;
1235 r->pcnt = r->bcnt = 0;
1239 r->next = ipfw_dyn_v[i];
1243 DPRINTF("-- add dyn entry ty %d 0x%08x %d -> 0x%08x %d, total %d\n",
1245 r->id.src_ip, r->id.src_port,
1246 r->id.dst_ip, r->id.dst_port, dyn_count);
1251 * lookup dynamic parent rule using pkt and rule as search keys.
1252 * If the lookup fails, then install one.
1254 static ipfw_dyn_rule *
1255 lookup_dyn_parent(struct ipfw_flow_id *pkt, struct ip_fw *rule)
1261 i = hash_packet(pkt);
1262 for (q = ipfw_dyn_v[i]; q != NULL; q = q->next) {
1263 if (q->dyn_type == O_LIMIT_PARENT &&
1264 rule->stub == q->stub &&
1265 pkt->proto == q->id.proto &&
1266 pkt->src_ip == q->id.src_ip &&
1267 pkt->dst_ip == q->id.dst_ip &&
1268 pkt->src_port == q->id.src_port &&
1269 pkt->dst_port == q->id.dst_port) {
1270 q->expire = time_second + dyn_short_lifetime;
1271 DPRINTF("lookup_dyn_parent found 0x%p\n", q);
1276 return add_dyn_rule(pkt, O_LIMIT_PARENT, rule);
1280 * Install dynamic state for rule type cmd->o.opcode
1282 * Returns 1 (failure) if state is not installed because of errors or because
1283 * session limitations are enforced.
1286 install_state_locked(struct ip_fw *rule, ipfw_insn_limit *cmd,
1287 struct ip_fw_args *args)
1289 static int last_log; /* XXX */
1293 DPRINTF("-- install state type %d 0x%08x %u -> 0x%08x %u\n",
1295 args->f_id.src_ip, args->f_id.src_port,
1296 args->f_id.dst_ip, args->f_id.dst_port);
1298 q = lookup_dyn_rule(&args->f_id, NULL, NULL);
1299 if (q != NULL) { /* should never occur */
1300 if (last_log != time_second) {
1301 last_log = time_second;
1302 kprintf(" install_state: entry already present, done\n");
1307 if (dyn_count >= dyn_max) {
1309 * Run out of slots, try to remove any expired rule.
1311 remove_dyn_rule_locked(NULL, (ipfw_dyn_rule *)1);
1312 if (dyn_count >= dyn_max) {
1313 if (last_log != time_second) {
1314 last_log = time_second;
1315 kprintf("install_state: "
1316 "Too many dynamic rules\n");
1318 return 1; /* cannot install, notify caller */
1322 switch (cmd->o.opcode) {
1323 case O_KEEP_STATE: /* bidir rule */
1324 if (add_dyn_rule(&args->f_id, O_KEEP_STATE, rule) == NULL)
1328 case O_LIMIT: /* limit number of sessions */
1330 uint16_t limit_mask = cmd->limit_mask;
1331 struct ipfw_flow_id id;
1332 ipfw_dyn_rule *parent;
1334 DPRINTF("installing dyn-limit rule %d\n",
1337 id.dst_ip = id.src_ip = 0;
1338 id.dst_port = id.src_port = 0;
1339 id.proto = args->f_id.proto;
1341 if (limit_mask & DYN_SRC_ADDR)
1342 id.src_ip = args->f_id.src_ip;
1343 if (limit_mask & DYN_DST_ADDR)
1344 id.dst_ip = args->f_id.dst_ip;
1345 if (limit_mask & DYN_SRC_PORT)
1346 id.src_port = args->f_id.src_port;
1347 if (limit_mask & DYN_DST_PORT)
1348 id.dst_port = args->f_id.dst_port;
1350 parent = lookup_dyn_parent(&id, rule);
1351 if (parent == NULL) {
1352 kprintf("add parent failed\n");
1356 if (parent->count >= cmd->conn_limit) {
1358 * See if we can remove some expired rule.
1360 remove_dyn_rule_locked(rule, parent);
1361 if (parent->count >= cmd->conn_limit) {
1363 last_log != time_second) {
1364 last_log = time_second;
1365 log(LOG_SECURITY | LOG_DEBUG,
1367 "too many entries\n");
1372 if (add_dyn_rule(&args->f_id, O_LIMIT,
1373 (struct ip_fw *)parent) == NULL)
1378 kprintf("unknown dynamic rule type %u\n", cmd->o.opcode);
1381 lookup_dyn_rule(&args->f_id, NULL, NULL); /* XXX just set lifetime */
1386 install_state(struct ip_fw *rule, ipfw_insn_limit *cmd,
1387 struct ip_fw_args *args, int *deny)
1389 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
1394 gen = ctx->ipfw_gen;
1396 lockmgr(&dyn_lock, LK_EXCLUSIVE);
1397 if (ctx->ipfw_gen != gen) {
1398 /* See the comment in lookup_rule() */
1401 ret = install_state_locked(rule, cmd, args);
1403 lockmgr(&dyn_lock, LK_RELEASE);
1409 * Transmit a TCP packet, containing either a RST or a keepalive.
1410 * When flags & TH_RST, we are sending a RST packet, because of a
1411 * "reset" action matched the packet.
1412 * Otherwise we are sending a keepalive, and flags & TH_
1415 send_pkt(struct ipfw_flow_id *id, uint32_t seq, uint32_t ack, int flags)
1420 struct route sro; /* fake route */
1422 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
1425 m->m_pkthdr.rcvif = NULL;
1426 m->m_pkthdr.len = m->m_len = sizeof(struct ip) + sizeof(struct tcphdr);
1427 m->m_data += max_linkhdr;
1429 ip = mtod(m, struct ip *);
1430 bzero(ip, m->m_len);
1431 tcp = (struct tcphdr *)(ip + 1); /* no IP options */
1432 ip->ip_p = IPPROTO_TCP;
1436 * Assume we are sending a RST (or a keepalive in the reverse
1437 * direction), swap src and destination addresses and ports.
1439 ip->ip_src.s_addr = htonl(id->dst_ip);
1440 ip->ip_dst.s_addr = htonl(id->src_ip);
1441 tcp->th_sport = htons(id->dst_port);
1442 tcp->th_dport = htons(id->src_port);
1443 if (flags & TH_RST) { /* we are sending a RST */
1444 if (flags & TH_ACK) {
1445 tcp->th_seq = htonl(ack);
1446 tcp->th_ack = htonl(0);
1447 tcp->th_flags = TH_RST;
1451 tcp->th_seq = htonl(0);
1452 tcp->th_ack = htonl(seq);
1453 tcp->th_flags = TH_RST | TH_ACK;
1457 * We are sending a keepalive. flags & TH_SYN determines
1458 * the direction, forward if set, reverse if clear.
1459 * NOTE: seq and ack are always assumed to be correct
1460 * as set by the caller. This may be confusing...
1462 if (flags & TH_SYN) {
1464 * we have to rewrite the correct addresses!
1466 ip->ip_dst.s_addr = htonl(id->dst_ip);
1467 ip->ip_src.s_addr = htonl(id->src_ip);
1468 tcp->th_dport = htons(id->dst_port);
1469 tcp->th_sport = htons(id->src_port);
1471 tcp->th_seq = htonl(seq);
1472 tcp->th_ack = htonl(ack);
1473 tcp->th_flags = TH_ACK;
1477 * set ip_len to the payload size so we can compute
1478 * the tcp checksum on the pseudoheader
1479 * XXX check this, could save a couple of words ?
1481 ip->ip_len = htons(sizeof(struct tcphdr));
1482 tcp->th_sum = in_cksum(m, m->m_pkthdr.len);
1485 * now fill fields left out earlier
1487 ip->ip_ttl = ip_defttl;
1488 ip->ip_len = m->m_pkthdr.len;
1490 bzero(&sro, sizeof(sro));
1491 ip_rtaddr(ip->ip_dst, &sro);
1493 m->m_pkthdr.fw_flags |= IPFW_MBUF_GENERATED;
1494 ip_output(m, NULL, &sro, 0, NULL, NULL);
1500 * sends a reject message, consuming the mbuf passed as an argument.
1503 send_reject(struct ip_fw_args *args, int code, int offset, int ip_len)
1505 if (code != ICMP_REJECT_RST) { /* Send an ICMP unreach */
1506 /* We need the IP header in host order for icmp_error(). */
1507 if (args->eh != NULL) {
1508 struct ip *ip = mtod(args->m, struct ip *);
1510 ip->ip_len = ntohs(ip->ip_len);
1511 ip->ip_off = ntohs(ip->ip_off);
1513 icmp_error(args->m, ICMP_UNREACH, code, 0L, 0);
1514 } else if (offset == 0 && args->f_id.proto == IPPROTO_TCP) {
1515 struct tcphdr *const tcp =
1516 L3HDR(struct tcphdr, mtod(args->m, struct ip *));
1518 if ((tcp->th_flags & TH_RST) == 0) {
1519 send_pkt(&args->f_id, ntohl(tcp->th_seq),
1520 ntohl(tcp->th_ack), tcp->th_flags | TH_RST);
1531 * Given an ip_fw *, lookup_next_rule will return a pointer
1532 * to the next rule, which can be either the jump
1533 * target (for skipto instructions) or the next one in the list (in
1534 * all other cases including a missing jump target).
1535 * The result is also written in the "next_rule" field of the rule.
1536 * Backward jumps are not allowed, so start looking from the next
1539 * This never returns NULL -- in case we do not have an exact match,
1540 * the next rule is returned. When the ruleset is changed,
1541 * pointers are flushed so we are always correct.
1544 static struct ip_fw *
1545 lookup_next_rule(struct ip_fw *me)
1547 struct ip_fw *rule = NULL;
1550 /* look for action, in case it is a skipto */
1551 cmd = ACTION_PTR(me);
1552 if (cmd->opcode == O_LOG)
1554 if (cmd->opcode == O_SKIPTO) {
1555 for (rule = me->next; rule; rule = rule->next) {
1556 if (rule->rulenum >= cmd->arg1)
1560 if (rule == NULL) /* failure or not a skipto */
1562 me->next_rule = rule;
1567 _ipfw_match_uid(const struct ipfw_flow_id *fid, struct ifnet *oif,
1568 enum ipfw_opcodes opcode, uid_t uid)
1570 struct in_addr src_ip, dst_ip;
1571 struct inpcbinfo *pi;
1575 if (fid->proto == IPPROTO_TCP) {
1577 pi = &tcbinfo[mycpuid];
1578 } else if (fid->proto == IPPROTO_UDP) {
1586 * Values in 'fid' are in host byte order
1588 dst_ip.s_addr = htonl(fid->dst_ip);
1589 src_ip.s_addr = htonl(fid->src_ip);
1591 pcb = in_pcblookup_hash(pi,
1592 dst_ip, htons(fid->dst_port),
1593 src_ip, htons(fid->src_port),
1596 pcb = in_pcblookup_hash(pi,
1597 src_ip, htons(fid->src_port),
1598 dst_ip, htons(fid->dst_port),
1601 if (pcb == NULL || pcb->inp_socket == NULL)
1604 if (opcode == O_UID) {
1605 #define socheckuid(a,b) ((a)->so_cred->cr_uid != (b))
1606 return !socheckuid(pcb->inp_socket, uid);
1609 return groupmember(uid, pcb->inp_socket->so_cred);
1614 ipfw_match_uid(const struct ipfw_flow_id *fid, struct ifnet *oif,
1615 enum ipfw_opcodes opcode, uid_t uid, int *deny)
1617 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
1622 gen = ctx->ipfw_gen;
1625 if (gen != ctx->ipfw_gen) {
1626 /* See the comment in lookup_rule() */
1629 match = _ipfw_match_uid(fid, oif, opcode, uid);
1636 * The main check routine for the firewall.
1638 * All arguments are in args so we can modify them and return them
1639 * back to the caller.
1643 * args->m (in/out) The packet; we set to NULL when/if we nuke it.
1644 * Starts with the IP header.
1645 * args->eh (in) Mac header if present, or NULL for layer3 packet.
1646 * args->oif Outgoing interface, or NULL if packet is incoming.
1647 * The incoming interface is in the mbuf. (in)
1649 * args->rule Pointer to the last matching rule (in/out)
1650 * args->f_id Addresses grabbed from the packet (out)
1654 * If the packet was denied/rejected and has been dropped, *m is equal
1655 * to NULL upon return.
1657 * IP_FW_DENY the packet must be dropped.
1658 * IP_FW_PASS The packet is to be accepted and routed normally.
1659 * IP_FW_DIVERT Divert the packet to port (args->cookie)
1660 * IP_FW_TEE Tee the packet to port (args->cookie)
1661 * IP_FW_DUMMYNET Send the packet to pipe/queue (args->cookie)
1665 ipfw_chk(struct ip_fw_args *args)
1668 * Local variables hold state during the processing of a packet.
1670 * IMPORTANT NOTE: to speed up the processing of rules, there
1671 * are some assumption on the values of the variables, which
1672 * are documented here. Should you change them, please check
1673 * the implementation of the various instructions to make sure
1674 * that they still work.
1676 * args->eh The MAC header. It is non-null for a layer2
1677 * packet, it is NULL for a layer-3 packet.
1679 * m | args->m Pointer to the mbuf, as received from the caller.
1680 * It may change if ipfw_chk() does an m_pullup, or if it
1681 * consumes the packet because it calls send_reject().
1682 * XXX This has to change, so that ipfw_chk() never modifies
1683 * or consumes the buffer.
1684 * ip is simply an alias of the value of m, and it is kept
1685 * in sync with it (the packet is supposed to start with
1688 struct mbuf *m = args->m;
1689 struct ip *ip = mtod(m, struct ip *);
1692 * oif | args->oif If NULL, ipfw_chk has been called on the
1693 * inbound path (ether_input, ip_input).
1694 * If non-NULL, ipfw_chk has been called on the outbound path
1695 * (ether_output, ip_output).
1697 struct ifnet *oif = args->oif;
1699 struct ip_fw *f = NULL; /* matching rule */
1700 int retval = IP_FW_PASS;
1702 struct divert_info *divinfo;
1705 * hlen The length of the IPv4 header.
1706 * hlen >0 means we have an IPv4 packet.
1708 u_int hlen = 0; /* hlen >0 means we have an IP pkt */
1711 * offset The offset of a fragment. offset != 0 means that
1712 * we have a fragment at this offset of an IPv4 packet.
1713 * offset == 0 means that (if this is an IPv4 packet)
1714 * this is the first or only fragment.
1719 * Local copies of addresses. They are only valid if we have
1722 * proto The protocol. Set to 0 for non-ip packets,
1723 * or to the protocol read from the packet otherwise.
1724 * proto != 0 means that we have an IPv4 packet.
1726 * src_port, dst_port port numbers, in HOST format. Only
1727 * valid for TCP and UDP packets.
1729 * src_ip, dst_ip ip addresses, in NETWORK format.
1730 * Only valid for IPv4 packets.
1733 uint16_t src_port = 0, dst_port = 0; /* NOTE: host format */
1734 struct in_addr src_ip, dst_ip; /* NOTE: network format */
1735 uint16_t ip_len = 0;
1738 * dyn_dir = MATCH_UNKNOWN when rules unchecked,
1739 * MATCH_NONE when checked and not matched (dyn_f = NULL),
1740 * MATCH_FORWARD or MATCH_REVERSE otherwise (dyn_f != NULL)
1742 int dyn_dir = MATCH_UNKNOWN;
1743 struct ip_fw *dyn_f = NULL;
1744 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
1746 if (m->m_pkthdr.fw_flags & IPFW_MBUF_GENERATED)
1747 return IP_FW_PASS; /* accept */
1749 if (args->eh == NULL || /* layer 3 packet */
1750 (m->m_pkthdr.len >= sizeof(struct ip) &&
1751 ntohs(args->eh->ether_type) == ETHERTYPE_IP))
1752 hlen = ip->ip_hl << 2;
1755 * Collect parameters into local variables for faster matching.
1757 if (hlen == 0) { /* do not grab addresses for non-ip pkts */
1758 proto = args->f_id.proto = 0; /* mark f_id invalid */
1759 goto after_ip_checks;
1762 proto = args->f_id.proto = ip->ip_p;
1763 src_ip = ip->ip_src;
1764 dst_ip = ip->ip_dst;
1765 if (args->eh != NULL) { /* layer 2 packets are as on the wire */
1766 offset = ntohs(ip->ip_off) & IP_OFFMASK;
1767 ip_len = ntohs(ip->ip_len);
1769 offset = ip->ip_off & IP_OFFMASK;
1770 ip_len = ip->ip_len;
1773 #define PULLUP_TO(len) \
1775 if (m->m_len < (len)) { \
1776 args->m = m = m_pullup(m, (len));\
1778 goto pullup_failed; \
1779 ip = mtod(m, struct ip *); \
1789 PULLUP_TO(hlen + sizeof(struct tcphdr));
1790 tcp = L3HDR(struct tcphdr, ip);
1791 dst_port = tcp->th_dport;
1792 src_port = tcp->th_sport;
1793 args->f_id.flags = tcp->th_flags;
1801 PULLUP_TO(hlen + sizeof(struct udphdr));
1802 udp = L3HDR(struct udphdr, ip);
1803 dst_port = udp->uh_dport;
1804 src_port = udp->uh_sport;
1809 PULLUP_TO(hlen + 4); /* type, code and checksum. */
1810 args->f_id.flags = L3HDR(struct icmp, ip)->icmp_type;
1820 args->f_id.src_ip = ntohl(src_ip.s_addr);
1821 args->f_id.dst_ip = ntohl(dst_ip.s_addr);
1822 args->f_id.src_port = src_port = ntohs(src_port);
1823 args->f_id.dst_port = dst_port = ntohs(dst_port);
1828 * Packet has already been tagged. Look for the next rule
1829 * to restart processing.
1831 * If fw_one_pass != 0 then just accept it.
1832 * XXX should not happen here, but optimized out in
1838 /* This rule is being/has been flushed */
1842 KASSERT(args->rule->cpuid == mycpuid,
1843 ("rule used on cpu%d", mycpuid));
1845 /* This rule was deleted */
1846 if (args->rule->rule_flags & IPFW_RULE_F_INVALID)
1849 f = args->rule->next_rule;
1851 f = lookup_next_rule(args->rule);
1854 * Find the starting rule. It can be either the first
1855 * one, or the one after divert_rule if asked so.
1859 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL);
1861 divinfo = m_tag_data(mtag);
1862 skipto = divinfo->skipto;
1867 f = ctx->ipfw_layer3_chain;
1868 if (args->eh == NULL && skipto != 0) {
1869 /* No skipto during rule flushing */
1873 if (skipto >= IPFW_DEFAULT_RULE)
1874 return IP_FW_DENY; /* invalid */
1876 while (f && f->rulenum <= skipto)
1878 if (f == NULL) /* drop packet */
1880 } else if (ipfw_flushing) {
1881 /* Rules are being flushed; skip to default rule */
1882 f = ctx->ipfw_default_rule;
1885 if ((mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL)
1886 m_tag_delete(m, mtag);
1889 * Now scan the rules, and parse microinstructions for each rule.
1891 for (; f; f = f->next) {
1894 int skip_or; /* skip rest of OR block */
1897 if (ctx->ipfw_set_disable & (1 << f->set))
1901 for (l = f->cmd_len, cmd = f->cmd; l > 0;
1902 l -= cmdlen, cmd += cmdlen) {
1906 * check_body is a jump target used when we find a
1907 * CHECK_STATE, and need to jump to the body of
1912 cmdlen = F_LEN(cmd);
1914 * An OR block (insn_1 || .. || insn_n) has the
1915 * F_OR bit set in all but the last instruction.
1916 * The first match will set "skip_or", and cause
1917 * the following instructions to be skipped until
1918 * past the one with the F_OR bit clear.
1920 if (skip_or) { /* skip this instruction */
1921 if ((cmd->len & F_OR) == 0)
1922 skip_or = 0; /* next one is good */
1925 match = 0; /* set to 1 if we succeed */
1927 switch (cmd->opcode) {
1929 * The first set of opcodes compares the packet's
1930 * fields with some pattern, setting 'match' if a
1931 * match is found. At the end of the loop there is
1932 * logic to deal with F_NOT and F_OR flags associated
1940 kprintf("ipfw: opcode %d unimplemented\n",
1947 * We only check offset == 0 && proto != 0,
1948 * as this ensures that we have an IPv4
1949 * packet with the ports info.
1954 match = ipfw_match_uid(&args->f_id, oif,
1956 (uid_t)((ipfw_insn_u32 *)cmd)->d[0],
1963 match = iface_match(m->m_pkthdr.rcvif,
1964 (ipfw_insn_if *)cmd);
1968 match = iface_match(oif, (ipfw_insn_if *)cmd);
1972 match = iface_match(oif ? oif :
1973 m->m_pkthdr.rcvif, (ipfw_insn_if *)cmd);
1977 if (args->eh != NULL) { /* have MAC header */
1978 uint32_t *want = (uint32_t *)
1979 ((ipfw_insn_mac *)cmd)->addr;
1980 uint32_t *mask = (uint32_t *)
1981 ((ipfw_insn_mac *)cmd)->mask;
1982 uint32_t *hdr = (uint32_t *)args->eh;
1985 (want[0] == (hdr[0] & mask[0]) &&
1986 want[1] == (hdr[1] & mask[1]) &&
1987 want[2] == (hdr[2] & mask[2]));
1992 if (args->eh != NULL) {
1994 ntohs(args->eh->ether_type);
1996 ((ipfw_insn_u16 *)cmd)->ports;
1999 /* Special vlan handling */
2000 if (m->m_flags & M_VLANTAG)
2003 for (i = cmdlen - 1; !match && i > 0;
2006 (t >= p[0] && t <= p[1]);
2012 match = (hlen > 0 && offset != 0);
2015 case O_IN: /* "out" is "not in" */
2016 match = (oif == NULL);
2020 match = (args->eh != NULL);
2025 * We do not allow an arg of 0 so the
2026 * check of "proto" only suffices.
2028 match = (proto == cmd->arg1);
2032 match = (hlen > 0 &&
2033 ((ipfw_insn_ip *)cmd)->addr.s_addr ==
2038 match = (hlen > 0 &&
2039 ((ipfw_insn_ip *)cmd)->addr.s_addr ==
2041 ((ipfw_insn_ip *)cmd)->mask.s_addr));
2048 tif = INADDR_TO_IFP(&src_ip);
2049 match = (tif != NULL);
2056 uint32_t *d = (uint32_t *)(cmd + 1);
2058 cmd->opcode == O_IP_DST_SET ?
2064 addr -= d[0]; /* subtract base */
2066 (addr < cmd->arg1) &&
2067 (d[1 + (addr >> 5)] &
2068 (1 << (addr & 0x1f)));
2073 match = (hlen > 0 &&
2074 ((ipfw_insn_ip *)cmd)->addr.s_addr ==
2079 match = (hlen > 0) &&
2080 (((ipfw_insn_ip *)cmd)->addr.s_addr ==
2082 ((ipfw_insn_ip *)cmd)->mask.s_addr));
2089 tif = INADDR_TO_IFP(&dst_ip);
2090 match = (tif != NULL);
2097 * offset == 0 && proto != 0 is enough
2098 * to guarantee that we have an IPv4
2099 * packet with port info.
2101 if ((proto==IPPROTO_UDP || proto==IPPROTO_TCP)
2104 (cmd->opcode == O_IP_SRCPORT) ?
2105 src_port : dst_port ;
2107 ((ipfw_insn_u16 *)cmd)->ports;
2110 for (i = cmdlen - 1; !match && i > 0;
2113 (x >= p[0] && x <= p[1]);
2119 match = (offset == 0 && proto==IPPROTO_ICMP &&
2120 icmptype_match(ip, (ipfw_insn_u32 *)cmd));
2124 match = (hlen > 0 && ipopts_match(ip, cmd));
2128 match = (hlen > 0 && cmd->arg1 == ip->ip_v);
2132 match = (hlen > 0 && cmd->arg1 == ip->ip_ttl);
2136 match = (hlen > 0 &&
2137 cmd->arg1 == ntohs(ip->ip_id));
2141 match = (hlen > 0 && cmd->arg1 == ip_len);
2144 case O_IPPRECEDENCE:
2145 match = (hlen > 0 &&
2146 (cmd->arg1 == (ip->ip_tos & 0xe0)));
2150 match = (hlen > 0 &&
2151 flags_match(cmd, ip->ip_tos));
2155 match = (proto == IPPROTO_TCP && offset == 0 &&
2157 L3HDR(struct tcphdr,ip)->th_flags));
2161 match = (proto == IPPROTO_TCP && offset == 0 &&
2162 tcpopts_match(ip, cmd));
2166 match = (proto == IPPROTO_TCP && offset == 0 &&
2167 ((ipfw_insn_u32 *)cmd)->d[0] ==
2168 L3HDR(struct tcphdr,ip)->th_seq);
2172 match = (proto == IPPROTO_TCP && offset == 0 &&
2173 ((ipfw_insn_u32 *)cmd)->d[0] ==
2174 L3HDR(struct tcphdr,ip)->th_ack);
2178 match = (proto == IPPROTO_TCP && offset == 0 &&
2180 L3HDR(struct tcphdr,ip)->th_win);
2184 /* reject packets which have SYN only */
2185 /* XXX should i also check for TH_ACK ? */
2186 match = (proto == IPPROTO_TCP && offset == 0 &&
2187 (L3HDR(struct tcphdr,ip)->th_flags &
2188 (TH_RST | TH_ACK | TH_SYN)) != TH_SYN);
2193 ipfw_log(f, hlen, args->eh, m, oif);
2198 match = (krandom() <
2199 ((ipfw_insn_u32 *)cmd)->d[0]);
2203 * The second set of opcodes represents 'actions',
2204 * i.e. the terminal part of a rule once the packet
2205 * matches all previous patterns.
2206 * Typically there is only one action for each rule,
2207 * and the opcode is stored at the end of the rule
2208 * (but there are exceptions -- see below).
2210 * In general, here we set retval and terminate the
2211 * outer loop (would be a 'break 3' in some language,
2212 * but we need to do a 'goto done').
2215 * O_COUNT and O_SKIPTO actions:
2216 * instead of terminating, we jump to the next rule
2217 * ('goto next_rule', equivalent to a 'break 2'),
2218 * or to the SKIPTO target ('goto again' after
2219 * having set f, cmd and l), respectively.
2221 * O_LIMIT and O_KEEP_STATE: these opcodes are
2222 * not real 'actions', and are stored right
2223 * before the 'action' part of the rule.
2224 * These opcodes try to install an entry in the
2225 * state tables; if successful, we continue with
2226 * the next opcode (match=1; break;), otherwise
2227 * the packet must be dropped ('goto done' after
2228 * setting retval). If static rules are changed
2229 * during the state installation, the packet will
2230 * be dropped and rule's stats will not beupdated
2231 * ('return IP_FW_DENY').
2233 * O_PROBE_STATE and O_CHECK_STATE: these opcodes
2234 * cause a lookup of the state table, and a jump
2235 * to the 'action' part of the parent rule
2236 * ('goto check_body') if an entry is found, or
2237 * (CHECK_STATE only) a jump to the next rule if
2238 * the entry is not found ('goto next_rule').
2239 * The result of the lookup is cached to make
2240 * further instances of these opcodes are
2241 * effectively NOPs. If static rules are changed
2242 * during the state looking up, the packet will
2243 * be dropped and rule's stats will not be updated
2244 * ('return IP_FW_DENY').
2248 if (!(f->rule_flags & IPFW_RULE_F_STATE)) {
2249 kprintf("%s rule (%d) is not ready "
2251 cmd->opcode == O_LIMIT ?
2252 "limit" : "keep state",
2253 f->rulenum, f->cpuid);
2256 if (install_state(f,
2257 (ipfw_insn_limit *)cmd, args, &deny)) {
2261 retval = IP_FW_DENY;
2262 goto done; /* error/limit violation */
2272 * dynamic rules are checked at the first
2273 * keep-state or check-state occurrence,
2274 * with the result being stored in dyn_dir.
2275 * The compiler introduces a PROBE_STATE
2276 * instruction for us when we have a
2277 * KEEP_STATE (because PROBE_STATE needs
2280 if (dyn_dir == MATCH_UNKNOWN) {
2281 dyn_f = lookup_rule(&args->f_id,
2283 proto == IPPROTO_TCP ?
2284 L3HDR(struct tcphdr, ip) : NULL,
2288 if (dyn_f != NULL) {
2290 * Found a rule from a dynamic
2291 * entry; jump to the 'action'
2295 cmd = ACTION_PTR(f);
2296 l = f->cmd_len - f->act_ofs;
2301 * Dynamic entry not found. If CHECK_STATE,
2302 * skip to next rule, if PROBE_STATE just
2303 * ignore and continue with next opcode.
2305 if (cmd->opcode == O_CHECK_STATE)
2307 else if (!(f->rule_flags & IPFW_RULE_F_STATE))
2308 goto next_rule; /* not ready yet */
2313 retval = IP_FW_PASS; /* accept */
2318 args->rule = f; /* report matching rule */
2319 args->cookie = cmd->arg1;
2320 retval = IP_FW_DUMMYNET;
2325 if (args->eh) /* not on layer 2 */
2328 mtag = m_tag_get(PACKET_TAG_IPFW_DIVERT,
2329 sizeof(*divinfo), MB_DONTWAIT);
2331 retval = IP_FW_DENY;
2334 divinfo = m_tag_data(mtag);
2336 divinfo->skipto = f->rulenum;
2337 divinfo->port = cmd->arg1;
2338 divinfo->tee = (cmd->opcode == O_TEE);
2339 m_tag_prepend(m, mtag);
2341 args->cookie = cmd->arg1;
2342 retval = (cmd->opcode == O_DIVERT) ?
2343 IP_FW_DIVERT : IP_FW_TEE;
2348 f->pcnt++; /* update stats */
2350 f->timestamp = time_second;
2351 if (cmd->opcode == O_COUNT)
2354 if (f->next_rule == NULL)
2355 lookup_next_rule(f);
2361 * Drop the packet and send a reject notice
2362 * if the packet is not ICMP (or is an ICMP
2363 * query), and it is not multicast/broadcast.
2366 (proto != IPPROTO_ICMP ||
2367 is_icmp_query(ip)) &&
2368 !(m->m_flags & (M_BCAST|M_MCAST)) &&
2369 !IN_MULTICAST(ntohl(dst_ip.s_addr))) {
2371 * Update statistics before the possible
2372 * blocking 'send_reject'
2376 f->timestamp = time_second;
2378 send_reject(args, cmd->arg1,
2383 * Return directly here, rule stats
2384 * have been updated above.
2390 retval = IP_FW_DENY;
2394 if (args->eh) /* not valid on layer2 pkts */
2396 if (!dyn_f || dyn_dir == MATCH_FORWARD) {
2397 struct sockaddr_in *sin;
2399 mtag = m_tag_get(PACKET_TAG_IPFORWARD,
2400 sizeof(*sin), MB_DONTWAIT);
2402 retval = IP_FW_DENY;
2405 sin = m_tag_data(mtag);
2407 /* Structure copy */
2408 *sin = ((ipfw_insn_sa *)cmd)->sa;
2410 m_tag_prepend(m, mtag);
2411 m->m_pkthdr.fw_flags |=
2412 IPFORWARD_MBUF_TAGGED;
2413 m->m_pkthdr.fw_flags &=
2414 ~BRIDGE_MBUF_TAGGED;
2416 retval = IP_FW_PASS;
2420 panic("-- unknown opcode %d", cmd->opcode);
2421 } /* end of switch() on opcodes */
2423 if (cmd->len & F_NOT)
2427 if (cmd->len & F_OR)
2430 if (!(cmd->len & F_OR)) /* not an OR block, */
2431 break; /* try next rule */
2434 } /* end of inner for, scan opcodes */
2436 next_rule:; /* try next rule */
2438 } /* end of outer for, scan rules */
2439 kprintf("+++ ipfw: ouch!, skip past end of rules, denying packet\n");
2443 /* Update statistics */
2446 f->timestamp = time_second;
2451 kprintf("pullup failed\n");
2456 ipfw_dummynet_io(struct mbuf *m, int pipe_nr, int dir, struct ip_fw_args *fwa)
2461 const struct ipfw_flow_id *id;
2462 struct dn_flow_id *fid;
2466 mtag = m_tag_get(PACKET_TAG_DUMMYNET, sizeof(*pkt), MB_DONTWAIT);
2471 m_tag_prepend(m, mtag);
2473 pkt = m_tag_data(mtag);
2474 bzero(pkt, sizeof(*pkt));
2476 cmd = fwa->rule->cmd + fwa->rule->act_ofs;
2477 if (cmd->opcode == O_LOG)
2479 KASSERT(cmd->opcode == O_PIPE || cmd->opcode == O_QUEUE,
2480 ("Rule is not PIPE or QUEUE, opcode %d", cmd->opcode));
2483 pkt->dn_flags = (dir & DN_FLAGS_DIR_MASK);
2484 pkt->ifp = fwa->oif;
2485 pkt->pipe_nr = pipe_nr;
2487 pkt->cpuid = mycpuid;
2488 pkt->msgport = cur_netport();
2492 fid->fid_dst_ip = id->dst_ip;
2493 fid->fid_src_ip = id->src_ip;
2494 fid->fid_dst_port = id->dst_port;
2495 fid->fid_src_port = id->src_port;
2496 fid->fid_proto = id->proto;
2497 fid->fid_flags = id->flags;
2499 ipfw_ref_rule(fwa->rule);
2500 pkt->dn_priv = fwa->rule;
2501 pkt->dn_unref_priv = ipfw_unref_rule;
2503 if (cmd->opcode == O_PIPE)
2504 pkt->dn_flags |= DN_FLAGS_IS_PIPE;
2506 m->m_pkthdr.fw_flags |= DUMMYNET_MBUF_TAGGED;
2510 * When a rule is added/deleted, clear the next_rule pointers in all rules.
2511 * These will be reconstructed on the fly as packets are matched.
2512 * Must be called at splimp().
2515 ipfw_flush_rule_ptrs(struct ipfw_context *ctx)
2519 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next)
2520 rule->next_rule = NULL;
2523 static __inline void
2524 ipfw_inc_static_count(struct ip_fw *rule)
2526 /* Static rule's counts are updated only on CPU0 */
2527 KKASSERT(mycpuid == 0);
2530 static_ioc_len += IOC_RULESIZE(rule);
2533 static __inline void
2534 ipfw_dec_static_count(struct ip_fw *rule)
2536 int l = IOC_RULESIZE(rule);
2538 /* Static rule's counts are updated only on CPU0 */
2539 KKASSERT(mycpuid == 0);
2541 KASSERT(static_count > 0, ("invalid static count %u", static_count));
2544 KASSERT(static_ioc_len >= l,
2545 ("invalid static len %u", static_ioc_len));
2546 static_ioc_len -= l;
2550 ipfw_link_sibling(struct netmsg_ipfw *fwmsg, struct ip_fw *rule)
2552 if (fwmsg->sibling != NULL) {
2553 KKASSERT(mycpuid > 0 && fwmsg->sibling->cpuid == mycpuid - 1);
2554 fwmsg->sibling->sibling = rule;
2556 fwmsg->sibling = rule;
2559 static struct ip_fw *
2560 ipfw_create_rule(const struct ipfw_ioc_rule *ioc_rule, struct ip_fw_stub *stub)
2564 rule = kmalloc(RULESIZE(ioc_rule), M_IPFW, M_WAITOK | M_ZERO);
2566 rule->act_ofs = ioc_rule->act_ofs;
2567 rule->cmd_len = ioc_rule->cmd_len;
2568 rule->rulenum = ioc_rule->rulenum;
2569 rule->set = ioc_rule->set;
2570 rule->usr_flags = ioc_rule->usr_flags;
2572 bcopy(ioc_rule->cmd, rule->cmd, rule->cmd_len * 4 /* XXX */);
2575 rule->cpuid = mycpuid;
2579 stub->rule[mycpuid] = rule;
2585 ipfw_add_rule_dispatch(netmsg_t nmsg)
2587 struct netmsg_ipfw *fwmsg = (struct netmsg_ipfw *)nmsg;
2588 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2591 rule = ipfw_create_rule(fwmsg->ioc_rule, fwmsg->stub);
2594 * Bump generation after ipfw_create_rule(),
2595 * since this function is blocking
2600 * Insert rule into the pre-determined position
2602 if (fwmsg->prev_rule != NULL) {
2603 struct ip_fw *prev, *next;
2605 prev = fwmsg->prev_rule;
2606 KKASSERT(prev->cpuid == mycpuid);
2608 next = fwmsg->next_rule;
2609 KKASSERT(next->cpuid == mycpuid);
2615 * Move to the position on the next CPU
2616 * before the msg is forwarded.
2618 fwmsg->prev_rule = prev->sibling;
2619 fwmsg->next_rule = next->sibling;
2621 KKASSERT(fwmsg->next_rule == NULL);
2622 rule->next = ctx->ipfw_layer3_chain;
2623 ctx->ipfw_layer3_chain = rule;
2626 /* Link rule CPU sibling */
2627 ipfw_link_sibling(fwmsg, rule);
2629 ipfw_flush_rule_ptrs(ctx);
2632 /* Statistics only need to be updated once */
2633 ipfw_inc_static_count(rule);
2635 /* Return the rule on CPU0 */
2636 nmsg->lmsg.u.ms_resultp = rule;
2639 ifnet_forwardmsg(&nmsg->lmsg, mycpuid + 1);
2643 ipfw_enable_state_dispatch(netmsg_t nmsg)
2645 struct lwkt_msg *lmsg = &nmsg->lmsg;
2646 struct ip_fw *rule = lmsg->u.ms_resultp;
2647 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2651 KKASSERT(rule->cpuid == mycpuid);
2652 KKASSERT(rule->stub != NULL && rule->stub->rule[mycpuid] == rule);
2653 KKASSERT(!(rule->rule_flags & IPFW_RULE_F_STATE));
2654 rule->rule_flags |= IPFW_RULE_F_STATE;
2655 lmsg->u.ms_resultp = rule->sibling;
2657 ifnet_forwardmsg(lmsg, mycpuid + 1);
2661 * Add a new rule to the list. Copy the rule into a malloc'ed area,
2662 * then possibly create a rule number and add the rule to the list.
2663 * Update the rule_number in the input struct so the caller knows
2667 ipfw_add_rule(struct ipfw_ioc_rule *ioc_rule, uint32_t rule_flags)
2669 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2670 struct netmsg_ipfw fwmsg;
2671 struct netmsg_base *nmsg;
2672 struct ip_fw *f, *prev, *rule;
2673 struct ip_fw_stub *stub;
2675 IPFW_ASSERT_CFGPORT(&curthread->td_msgport);
2678 * If rulenum is 0, find highest numbered rule before the
2679 * default rule, and add rule number incremental step.
2681 if (ioc_rule->rulenum == 0) {
2682 int step = autoinc_step;
2684 KKASSERT(step >= IPFW_AUTOINC_STEP_MIN &&
2685 step <= IPFW_AUTOINC_STEP_MAX);
2688 * Locate the highest numbered rule before default
2690 for (f = ctx->ipfw_layer3_chain; f; f = f->next) {
2691 if (f->rulenum == IPFW_DEFAULT_RULE)
2693 ioc_rule->rulenum = f->rulenum;
2695 if (ioc_rule->rulenum < IPFW_DEFAULT_RULE - step)
2696 ioc_rule->rulenum += step;
2698 KASSERT(ioc_rule->rulenum != IPFW_DEFAULT_RULE &&
2699 ioc_rule->rulenum != 0,
2700 ("invalid rule num %d", ioc_rule->rulenum));
2703 * Now find the right place for the new rule in the sorted list.
2705 for (prev = NULL, f = ctx->ipfw_layer3_chain; f;
2706 prev = f, f = f->next) {
2707 if (f->rulenum > ioc_rule->rulenum) {
2708 /* Found the location */
2712 KASSERT(f != NULL, ("no default rule?!"));
2714 if (rule_flags & IPFW_RULE_F_STATE) {
2718 * If the new rule will create states, then allocate
2719 * a rule stub, which will be referenced by states
2722 size = sizeof(*stub) + ((ncpus - 1) * sizeof(struct ip_fw *));
2723 stub = kmalloc(size, M_IPFW, M_WAITOK | M_ZERO);
2729 * Duplicate the rule onto each CPU.
2730 * The rule duplicated on CPU0 will be returned.
2732 bzero(&fwmsg, sizeof(fwmsg));
2734 netmsg_init(nmsg, NULL, &curthread->td_msgport,
2735 0, ipfw_add_rule_dispatch);
2736 fwmsg.ioc_rule = ioc_rule;
2737 fwmsg.prev_rule = prev;
2738 fwmsg.next_rule = prev == NULL ? NULL : f;
2741 ifnet_domsg(&nmsg->lmsg, 0);
2742 KKASSERT(fwmsg.prev_rule == NULL && fwmsg.next_rule == NULL);
2744 rule = nmsg->lmsg.u.ms_resultp;
2745 KKASSERT(rule != NULL && rule->cpuid == mycpuid);
2747 if (rule_flags & IPFW_RULE_F_STATE) {
2749 * Turn on state flag, _after_ everything on all
2750 * CPUs have been setup.
2752 bzero(nmsg, sizeof(*nmsg));
2753 netmsg_init(nmsg, NULL, &curthread->td_msgport,
2754 0, ipfw_enable_state_dispatch);
2755 nmsg->lmsg.u.ms_resultp = rule;
2757 ifnet_domsg(&nmsg->lmsg, 0);
2758 KKASSERT(nmsg->lmsg.u.ms_resultp == NULL);
2761 DPRINTF("++ installed rule %d, static count now %d\n",
2762 rule->rulenum, static_count);
2766 * Free storage associated with a static rule (including derived
2768 * The caller is in charge of clearing rule pointers to avoid
2769 * dangling pointers.
2770 * @return a pointer to the next entry.
2771 * Arguments are not checked, so they better be correct.
2772 * Must be called at splimp().
2774 static struct ip_fw *
2775 ipfw_delete_rule(struct ipfw_context *ctx,
2776 struct ip_fw *prev, struct ip_fw *rule)
2779 struct ip_fw_stub *stub;
2783 /* STATE flag should have been cleared before we reach here */
2784 KKASSERT((rule->rule_flags & IPFW_RULE_F_STATE) == 0);
2789 ctx->ipfw_layer3_chain = n;
2793 /* Mark the rule as invalid */
2794 rule->rule_flags |= IPFW_RULE_F_INVALID;
2795 rule->next_rule = NULL;
2796 rule->sibling = NULL;
2799 /* Don't reset cpuid here; keep various assertion working */
2803 /* Statistics only need to be updated once */
2805 ipfw_dec_static_count(rule);
2807 /* Free 'stub' on the last CPU */
2808 if (stub != NULL && mycpuid == ncpus - 1)
2809 kfree(stub, M_IPFW);
2811 /* Try to free this rule */
2812 ipfw_free_rule(rule);
2814 /* Return the next rule */
2819 ipfw_flush_dispatch(netmsg_t nmsg)
2821 struct lwkt_msg *lmsg = &nmsg->lmsg;
2822 int kill_default = lmsg->u.ms_result;
2823 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2826 ipfw_flush_rule_ptrs(ctx); /* more efficient to do outside the loop */
2828 while ((rule = ctx->ipfw_layer3_chain) != NULL &&
2829 (kill_default || rule->rulenum != IPFW_DEFAULT_RULE))
2830 ipfw_delete_rule(ctx, NULL, rule);
2832 ifnet_forwardmsg(lmsg, mycpuid + 1);
2836 ipfw_disable_rule_state_dispatch(netmsg_t nmsg)
2838 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
2839 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2844 rule = dmsg->start_rule;
2846 KKASSERT(rule->cpuid == mycpuid);
2849 * Move to the position on the next CPU
2850 * before the msg is forwarded.
2852 dmsg->start_rule = rule->sibling;
2854 KKASSERT(dmsg->rulenum == 0);
2855 rule = ctx->ipfw_layer3_chain;
2858 while (rule != NULL) {
2859 if (dmsg->rulenum && rule->rulenum != dmsg->rulenum)
2861 rule->rule_flags &= ~IPFW_RULE_F_STATE;
2865 ifnet_forwardmsg(&nmsg->lmsg, mycpuid + 1);
2869 * Deletes all rules from a chain (including the default rule
2870 * if the second argument is set).
2871 * Must be called at splimp().
2874 ipfw_flush(int kill_default)
2876 struct netmsg_del dmsg;
2877 struct netmsg_base nmsg;
2878 struct lwkt_msg *lmsg;
2880 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2882 IPFW_ASSERT_CFGPORT(&curthread->td_msgport);
2885 * If 'kill_default' then caller has done the necessary
2886 * msgport syncing; unnecessary to do it again.
2888 if (!kill_default) {
2890 * Let ipfw_chk() know the rules are going to
2891 * be flushed, so it could jump directly to
2895 netmsg_service_sync();
2899 * Clear STATE flag on rules, so no more states (dyn rules)
2902 bzero(&dmsg, sizeof(dmsg));
2903 netmsg_init(&dmsg.base, NULL, &curthread->td_msgport,
2904 0, ipfw_disable_rule_state_dispatch);
2905 ifnet_domsg(&dmsg.base.lmsg, 0);
2908 * This actually nukes all states (dyn rules)
2910 lockmgr(&dyn_lock, LK_EXCLUSIVE);
2911 for (rule = ctx->ipfw_layer3_chain; rule != NULL; rule = rule->next) {
2913 * Can't check IPFW_RULE_F_STATE here,
2914 * since it has been cleared previously.
2915 * Check 'stub' instead.
2917 if (rule->stub != NULL) {
2919 remove_dyn_rule_locked(rule, NULL);
2922 lockmgr(&dyn_lock, LK_RELEASE);
2925 * Press the 'flush' button
2927 bzero(&nmsg, sizeof(nmsg));
2928 netmsg_init(&nmsg, NULL, &curthread->td_msgport,
2929 0, ipfw_flush_dispatch);
2931 lmsg->u.ms_result = kill_default;
2932 ifnet_domsg(lmsg, 0);
2934 KASSERT(dyn_count == 0, ("%u dyn rule remains", dyn_count));
2937 if (ipfw_dyn_v != NULL) {
2939 * Free dynamic rules(state) hash table
2941 kfree(ipfw_dyn_v, M_IPFW);
2945 KASSERT(static_count == 0,
2946 ("%u static rules remain", static_count));
2947 KASSERT(static_ioc_len == 0,
2948 ("%u bytes of static rules remain", static_ioc_len));
2950 KASSERT(static_count == 1,
2951 ("%u static rules remain", static_count));
2952 KASSERT(static_ioc_len == IOC_RULESIZE(ctx->ipfw_default_rule),
2953 ("%u bytes of static rules remain, should be %lu",
2955 (u_long)IOC_RULESIZE(ctx->ipfw_default_rule)));
2963 ipfw_alt_delete_rule_dispatch(netmsg_t nmsg)
2965 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
2966 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2967 struct ip_fw *rule, *prev;
2969 rule = dmsg->start_rule;
2970 KKASSERT(rule->cpuid == mycpuid);
2971 dmsg->start_rule = rule->sibling;
2973 prev = dmsg->prev_rule;
2975 KKASSERT(prev->cpuid == mycpuid);
2978 * Move to the position on the next CPU
2979 * before the msg is forwarded.
2981 dmsg->prev_rule = prev->sibling;
2985 * flush pointers outside the loop, then delete all matching
2986 * rules. 'prev' remains the same throughout the cycle.
2988 ipfw_flush_rule_ptrs(ctx);
2989 while (rule && rule->rulenum == dmsg->rulenum)
2990 rule = ipfw_delete_rule(ctx, prev, rule);
2992 ifnet_forwardmsg(&nmsg->lmsg, mycpuid + 1);
2996 ipfw_alt_delete_rule(uint16_t rulenum)
2998 struct ip_fw *prev, *rule, *f;
2999 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3000 struct netmsg_del dmsg;
3001 struct netmsg_base *nmsg;
3005 * Locate first rule to delete
3007 for (prev = NULL, rule = ctx->ipfw_layer3_chain;
3008 rule && rule->rulenum < rulenum;
3009 prev = rule, rule = rule->next)
3011 if (rule->rulenum != rulenum)
3015 * Check whether any rules with the given number will
3019 for (f = rule; f && f->rulenum == rulenum; f = f->next) {
3020 if (f->rule_flags & IPFW_RULE_F_STATE) {
3028 * Clear the STATE flag, so no more states will be
3029 * created based the rules numbered 'rulenum'.
3031 bzero(&dmsg, sizeof(dmsg));
3033 netmsg_init(nmsg, NULL, &curthread->td_msgport,
3034 0, ipfw_disable_rule_state_dispatch);
3035 dmsg.start_rule = rule;
3036 dmsg.rulenum = rulenum;
3038 ifnet_domsg(&nmsg->lmsg, 0);
3039 KKASSERT(dmsg.start_rule == NULL);
3042 * Nuke all related states
3044 lockmgr(&dyn_lock, LK_EXCLUSIVE);
3045 for (f = rule; f && f->rulenum == rulenum; f = f->next) {
3047 * Can't check IPFW_RULE_F_STATE here,
3048 * since it has been cleared previously.
3049 * Check 'stub' instead.
3051 if (f->stub != NULL) {
3053 remove_dyn_rule_locked(f, NULL);
3056 lockmgr(&dyn_lock, LK_RELEASE);
3060 * Get rid of the rule duplications on all CPUs
3062 bzero(&dmsg, sizeof(dmsg));
3064 netmsg_init(nmsg, NULL, &curthread->td_msgport,
3065 0, ipfw_alt_delete_rule_dispatch);
3066 dmsg.prev_rule = prev;
3067 dmsg.start_rule = rule;
3068 dmsg.rulenum = rulenum;
3070 ifnet_domsg(&nmsg->lmsg, 0);
3071 KKASSERT(dmsg.prev_rule == NULL && dmsg.start_rule == NULL);
3076 ipfw_alt_delete_ruleset_dispatch(netmsg_t nmsg)
3078 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
3079 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3080 struct ip_fw *prev, *rule;
3085 ipfw_flush_rule_ptrs(ctx);
3088 rule = ctx->ipfw_layer3_chain;
3089 while (rule != NULL) {
3090 if (rule->set == dmsg->from_set) {
3091 rule = ipfw_delete_rule(ctx, prev, rule);
3100 KASSERT(del, ("no match set?!"));
3102 ifnet_forwardmsg(&nmsg->lmsg, mycpuid + 1);
3106 ipfw_disable_ruleset_state_dispatch(netmsg_t nmsg)
3108 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
3109 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3117 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next) {
3118 if (rule->set == dmsg->from_set) {
3122 rule->rule_flags &= ~IPFW_RULE_F_STATE;
3125 KASSERT(cleared, ("no match set?!"));
3127 ifnet_forwardmsg(&nmsg->lmsg, mycpuid + 1);
3131 ipfw_alt_delete_ruleset(uint8_t set)
3133 struct netmsg_del dmsg;
3134 struct netmsg_base *nmsg;
3137 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3140 * Check whether the 'set' exists. If it exists,
3141 * then check whether any rules within the set will
3142 * try to create states.
3146 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next) {
3147 if (rule->set == set) {
3149 if (rule->rule_flags & IPFW_RULE_F_STATE) {
3156 return 0; /* XXX EINVAL? */
3160 * Clear the STATE flag, so no more states will be
3161 * created based the rules in this set.
3163 bzero(&dmsg, sizeof(dmsg));
3165 netmsg_init(nmsg, NULL, &curthread->td_msgport,
3166 0, ipfw_disable_ruleset_state_dispatch);
3167 dmsg.from_set = set;
3169 ifnet_domsg(&nmsg->lmsg, 0);
3172 * Nuke all related states
3174 lockmgr(&dyn_lock, LK_EXCLUSIVE);
3175 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next) {
3176 if (rule->set != set)
3180 * Can't check IPFW_RULE_F_STATE here,
3181 * since it has been cleared previously.
3182 * Check 'stub' instead.
3184 if (rule->stub != NULL) {
3186 remove_dyn_rule_locked(rule, NULL);
3189 lockmgr(&dyn_lock, LK_RELEASE);
3195 bzero(&dmsg, sizeof(dmsg));
3197 netmsg_init(nmsg, NULL, &curthread->td_msgport,
3198 0, ipfw_alt_delete_ruleset_dispatch);
3199 dmsg.from_set = set;
3201 ifnet_domsg(&nmsg->lmsg, 0);
3206 ipfw_alt_move_rule_dispatch(netmsg_t nmsg)
3208 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
3211 rule = dmsg->start_rule;
3212 KKASSERT(rule->cpuid == mycpuid);
3215 * Move to the position on the next CPU
3216 * before the msg is forwarded.
3218 dmsg->start_rule = rule->sibling;
3220 while (rule && rule->rulenum <= dmsg->rulenum) {
3221 if (rule->rulenum == dmsg->rulenum)
3222 rule->set = dmsg->to_set;
3225 ifnet_forwardmsg(&nmsg->lmsg, mycpuid + 1);
3229 ipfw_alt_move_rule(uint16_t rulenum, uint8_t set)
3231 struct netmsg_del dmsg;
3232 struct netmsg_base *nmsg;
3234 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3237 * Locate first rule to move
3239 for (rule = ctx->ipfw_layer3_chain; rule && rule->rulenum <= rulenum;
3240 rule = rule->next) {
3241 if (rule->rulenum == rulenum && rule->set != set)
3244 if (rule == NULL || rule->rulenum > rulenum)
3245 return 0; /* XXX error? */
3247 bzero(&dmsg, sizeof(dmsg));
3249 netmsg_init(nmsg, NULL, &curthread->td_msgport,
3250 0, ipfw_alt_move_rule_dispatch);
3251 dmsg.start_rule = rule;
3252 dmsg.rulenum = rulenum;
3255 ifnet_domsg(&nmsg->lmsg, 0);
3256 KKASSERT(dmsg.start_rule == NULL);
3261 ipfw_alt_move_ruleset_dispatch(netmsg_t nmsg)
3263 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
3264 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3267 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next) {
3268 if (rule->set == dmsg->from_set)
3269 rule->set = dmsg->to_set;
3271 ifnet_forwardmsg(&nmsg->lmsg, mycpuid + 1);
3275 ipfw_alt_move_ruleset(uint8_t from_set, uint8_t to_set)
3277 struct netmsg_del dmsg;
3278 struct netmsg_base *nmsg;
3280 bzero(&dmsg, sizeof(dmsg));
3282 netmsg_init(nmsg, NULL, &curthread->td_msgport,
3283 0, ipfw_alt_move_ruleset_dispatch);
3284 dmsg.from_set = from_set;
3285 dmsg.to_set = to_set;
3287 ifnet_domsg(&nmsg->lmsg, 0);
3292 ipfw_alt_swap_ruleset_dispatch(netmsg_t nmsg)
3294 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
3295 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3298 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next) {
3299 if (rule->set == dmsg->from_set)
3300 rule->set = dmsg->to_set;
3301 else if (rule->set == dmsg->to_set)
3302 rule->set = dmsg->from_set;
3304 ifnet_forwardmsg(&nmsg->lmsg, mycpuid + 1);
3308 ipfw_alt_swap_ruleset(uint8_t set1, uint8_t set2)
3310 struct netmsg_del dmsg;
3311 struct netmsg_base *nmsg;
3313 bzero(&dmsg, sizeof(dmsg));
3315 netmsg_init(nmsg, NULL, &curthread->td_msgport,
3316 0, ipfw_alt_swap_ruleset_dispatch);
3317 dmsg.from_set = set1;
3320 ifnet_domsg(&nmsg->lmsg, 0);
3325 * Remove all rules with given number, and also do set manipulation.
3327 * The argument is an uint32_t. The low 16 bit are the rule or set number,
3328 * the next 8 bits are the new set, the top 8 bits are the command:
3330 * 0 delete rules with given number
3331 * 1 delete rules with given set number
3332 * 2 move rules with given number to new set
3333 * 3 move rules with given set number to new set
3334 * 4 swap sets with given numbers
3337 ipfw_ctl_alter(uint32_t arg)
3340 uint8_t cmd, new_set;
3343 rulenum = arg & 0xffff;
3344 cmd = (arg >> 24) & 0xff;
3345 new_set = (arg >> 16) & 0xff;
3349 if (new_set >= IPFW_DEFAULT_SET)
3351 if (cmd == 0 || cmd == 2) {
3352 if (rulenum == IPFW_DEFAULT_RULE)
3355 if (rulenum >= IPFW_DEFAULT_SET)
3360 case 0: /* delete rules with given number */
3361 error = ipfw_alt_delete_rule(rulenum);
3364 case 1: /* delete all rules with given set number */
3365 error = ipfw_alt_delete_ruleset(rulenum);
3368 case 2: /* move rules with given number to new set */
3369 error = ipfw_alt_move_rule(rulenum, new_set);
3372 case 3: /* move rules with given set number to new set */
3373 error = ipfw_alt_move_ruleset(rulenum, new_set);
3376 case 4: /* swap two sets */
3377 error = ipfw_alt_swap_ruleset(rulenum, new_set);
3384 * Clear counters for a specific rule.
3387 clear_counters(struct ip_fw *rule, int log_only)
3389 ipfw_insn_log *l = (ipfw_insn_log *)ACTION_PTR(rule);
3391 if (log_only == 0) {
3392 rule->bcnt = rule->pcnt = 0;
3393 rule->timestamp = 0;
3395 if (l->o.opcode == O_LOG)
3396 l->log_left = l->max_log;
3400 ipfw_zero_entry_dispatch(netmsg_t nmsg)
3402 struct netmsg_zent *zmsg = (struct netmsg_zent *)nmsg;
3403 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3406 if (zmsg->rulenum == 0) {
3407 KKASSERT(zmsg->start_rule == NULL);
3409 ctx->ipfw_norule_counter = 0;
3410 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next)
3411 clear_counters(rule, zmsg->log_only);
3413 struct ip_fw *start = zmsg->start_rule;
3415 KKASSERT(start->cpuid == mycpuid);
3416 KKASSERT(start->rulenum == zmsg->rulenum);
3419 * We can have multiple rules with the same number, so we
3420 * need to clear them all.
3422 for (rule = start; rule && rule->rulenum == zmsg->rulenum;
3424 clear_counters(rule, zmsg->log_only);
3427 * Move to the position on the next CPU
3428 * before the msg is forwarded.
3430 zmsg->start_rule = start->sibling;
3432 ifnet_forwardmsg(&nmsg->lmsg, mycpuid + 1);
3436 * Reset some or all counters on firewall rules.
3437 * @arg frwl is null to clear all entries, or contains a specific
3439 * @arg log_only is 1 if we only want to reset logs, zero otherwise.
3442 ipfw_ctl_zero_entry(int rulenum, int log_only)
3444 struct netmsg_zent zmsg;
3445 struct netmsg_base *nmsg;
3447 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3449 bzero(&zmsg, sizeof(zmsg));
3451 netmsg_init(nmsg, NULL, &curthread->td_msgport,
3452 0, ipfw_zero_entry_dispatch);
3453 zmsg.log_only = log_only;
3456 msg = log_only ? "ipfw: All logging counts reset.\n"
3457 : "ipfw: Accounting cleared.\n";
3462 * Locate the first rule with 'rulenum'
3464 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next) {
3465 if (rule->rulenum == rulenum)
3468 if (rule == NULL) /* we did not find any matching rules */
3470 zmsg.start_rule = rule;
3471 zmsg.rulenum = rulenum;
3473 msg = log_only ? "ipfw: Entry %d logging count reset.\n"
3474 : "ipfw: Entry %d cleared.\n";
3476 ifnet_domsg(&nmsg->lmsg, 0);
3477 KKASSERT(zmsg.start_rule == NULL);
3480 log(LOG_SECURITY | LOG_NOTICE, msg, rulenum);
3485 * Check validity of the structure before insert.
3486 * Fortunately rules are simple, so this mostly need to check rule sizes.
3489 ipfw_check_ioc_rule(struct ipfw_ioc_rule *rule, int size, uint32_t *rule_flags)
3492 int have_action = 0;
3497 /* Check for valid size */
3498 if (size < sizeof(*rule)) {
3499 kprintf("ipfw: rule too short\n");
3502 l = IOC_RULESIZE(rule);
3504 kprintf("ipfw: size mismatch (have %d want %d)\n", size, l);
3508 /* Check rule number */
3509 if (rule->rulenum == IPFW_DEFAULT_RULE) {
3510 kprintf("ipfw: invalid rule number\n");
3515 * Now go for the individual checks. Very simple ones, basically only
3516 * instruction sizes.
3518 for (l = rule->cmd_len, cmd = rule->cmd; l > 0;
3519 l -= cmdlen, cmd += cmdlen) {
3520 cmdlen = F_LEN(cmd);
3522 kprintf("ipfw: opcode %d size truncated\n",
3527 DPRINTF("ipfw: opcode %d\n", cmd->opcode);
3529 if (cmd->opcode == O_KEEP_STATE || cmd->opcode == O_LIMIT) {
3530 /* This rule will create states */
3531 *rule_flags |= IPFW_RULE_F_STATE;
3534 switch (cmd->opcode) {
3548 case O_IPPRECEDENCE:
3555 if (cmdlen != F_INSN_SIZE(ipfw_insn))
3567 if (cmdlen != F_INSN_SIZE(ipfw_insn_u32))
3572 if (cmdlen != F_INSN_SIZE(ipfw_insn_limit))
3577 if (cmdlen != F_INSN_SIZE(ipfw_insn_log))
3580 ((ipfw_insn_log *)cmd)->log_left =
3581 ((ipfw_insn_log *)cmd)->max_log;
3587 if (cmdlen != F_INSN_SIZE(ipfw_insn_ip))
3589 if (((ipfw_insn_ip *)cmd)->mask.s_addr == 0) {
3590 kprintf("ipfw: opcode %d, useless rule\n",
3598 if (cmd->arg1 == 0 || cmd->arg1 > 256) {
3599 kprintf("ipfw: invalid set size %d\n",
3603 if (cmdlen != F_INSN_SIZE(ipfw_insn_u32) +
3609 if (cmdlen != F_INSN_SIZE(ipfw_insn_mac))
3615 case O_IP_DSTPORT: /* XXX artificial limit, 30 port pairs */
3616 if (cmdlen < 2 || cmdlen > 31)
3623 if (cmdlen != F_INSN_SIZE(ipfw_insn_if))
3629 if (cmdlen != F_INSN_SIZE(ipfw_insn_pipe))
3634 if (cmdlen != F_INSN_SIZE(ipfw_insn_sa)) {
3639 fwd_addr = ((ipfw_insn_sa *)cmd)->
3641 if (IN_MULTICAST(ntohl(fwd_addr))) {
3642 kprintf("ipfw: try forwarding to "
3643 "multicast address\n");
3649 case O_FORWARD_MAC: /* XXX not implemented yet */
3658 if (cmdlen != F_INSN_SIZE(ipfw_insn))
3662 kprintf("ipfw: opcode %d, multiple actions"
3669 kprintf("ipfw: opcode %d, action must be"
3676 kprintf("ipfw: opcode %d, unknown opcode\n",
3681 if (have_action == 0) {
3682 kprintf("ipfw: missing action\n");
3688 kprintf("ipfw: opcode %d size %d wrong\n",
3689 cmd->opcode, cmdlen);
3694 ipfw_ctl_add_rule(struct sockopt *sopt)
3696 struct ipfw_ioc_rule *ioc_rule;
3698 uint32_t rule_flags;
3701 size = sopt->sopt_valsize;
3702 if (size > (sizeof(uint32_t) * IPFW_RULE_SIZE_MAX) ||
3703 size < sizeof(*ioc_rule)) {
3706 if (size != (sizeof(uint32_t) * IPFW_RULE_SIZE_MAX)) {
3707 sopt->sopt_val = krealloc(sopt->sopt_val, sizeof(uint32_t) *
3708 IPFW_RULE_SIZE_MAX, M_TEMP, M_WAITOK);
3710 ioc_rule = sopt->sopt_val;
3712 error = ipfw_check_ioc_rule(ioc_rule, size, &rule_flags);
3716 ipfw_add_rule(ioc_rule, rule_flags);
3718 if (sopt->sopt_dir == SOPT_GET)
3719 sopt->sopt_valsize = IOC_RULESIZE(ioc_rule);
3724 ipfw_copy_rule(const struct ip_fw *rule, struct ipfw_ioc_rule *ioc_rule)
3726 const struct ip_fw *sibling;
3731 KKASSERT(rule->cpuid == IPFW_CFGCPUID);
3733 ioc_rule->act_ofs = rule->act_ofs;
3734 ioc_rule->cmd_len = rule->cmd_len;
3735 ioc_rule->rulenum = rule->rulenum;
3736 ioc_rule->set = rule->set;
3737 ioc_rule->usr_flags = rule->usr_flags;
3739 ioc_rule->set_disable = ipfw_ctx[mycpuid]->ipfw_set_disable;
3740 ioc_rule->static_count = static_count;
3741 ioc_rule->static_len = static_ioc_len;
3744 * Visit (read-only) all of the rule's duplications to get
3745 * the necessary statistics
3752 ioc_rule->timestamp = 0;
3753 for (sibling = rule; sibling != NULL; sibling = sibling->sibling) {
3754 ioc_rule->pcnt += sibling->pcnt;
3755 ioc_rule->bcnt += sibling->bcnt;
3756 if (sibling->timestamp > ioc_rule->timestamp)
3757 ioc_rule->timestamp = sibling->timestamp;
3762 KASSERT(i == ncpus, ("static rule is not duplicated on every cpu"));
3764 bcopy(rule->cmd, ioc_rule->cmd, ioc_rule->cmd_len * 4 /* XXX */);
3766 return ((uint8_t *)ioc_rule + IOC_RULESIZE(ioc_rule));
3770 ipfw_copy_state(const ipfw_dyn_rule *dyn_rule,
3771 struct ipfw_ioc_state *ioc_state)
3773 const struct ipfw_flow_id *id;
3774 struct ipfw_ioc_flowid *ioc_id;
3776 ioc_state->expire = TIME_LEQ(dyn_rule->expire, time_second) ?
3777 0 : dyn_rule->expire - time_second;
3778 ioc_state->pcnt = dyn_rule->pcnt;
3779 ioc_state->bcnt = dyn_rule->bcnt;
3781 ioc_state->dyn_type = dyn_rule->dyn_type;
3782 ioc_state->count = dyn_rule->count;
3784 ioc_state->rulenum = dyn_rule->stub->rule[mycpuid]->rulenum;
3787 ioc_id = &ioc_state->id;
3789 ioc_id->type = ETHERTYPE_IP;
3790 ioc_id->u.ip.dst_ip = id->dst_ip;
3791 ioc_id->u.ip.src_ip = id->src_ip;
3792 ioc_id->u.ip.dst_port = id->dst_port;
3793 ioc_id->u.ip.src_port = id->src_port;
3794 ioc_id->u.ip.proto = id->proto;
3798 ipfw_ctl_get_rules(struct sockopt *sopt)
3800 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3804 uint32_t dcount = 0;
3807 * pass up a copy of the current rules. Static rules
3808 * come first (the last of which has number IPFW_DEFAULT_RULE),
3809 * followed by a possibly empty list of dynamic rule.
3812 size = static_ioc_len; /* size of static rules */
3813 if (ipfw_dyn_v) { /* add size of dyn.rules */
3815 size += dcount * sizeof(struct ipfw_ioc_state);
3818 if (sopt->sopt_valsize < size) {
3819 /* short length, no need to return incomplete rules */
3820 /* XXX: if superuser, no need to zero buffer */
3821 bzero(sopt->sopt_val, sopt->sopt_valsize);
3824 bp = sopt->sopt_val;
3826 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next)
3827 bp = ipfw_copy_rule(rule, bp);
3829 if (ipfw_dyn_v && dcount != 0) {
3830 struct ipfw_ioc_state *ioc_state = bp;
3831 uint32_t dcount2 = 0;
3833 size_t old_size = size;
3837 lockmgr(&dyn_lock, LK_SHARED);
3839 /* Check 'ipfw_dyn_v' again with lock held */
3840 if (ipfw_dyn_v == NULL)
3843 for (i = 0; i < curr_dyn_buckets; i++) {
3847 * The # of dynamic rules may have grown after the
3848 * snapshot of 'dyn_count' was taken, so we will have
3849 * to check 'dcount' (snapshot of dyn_count) here to
3850 * make sure that we don't overflow the pre-allocated
3853 for (p = ipfw_dyn_v[i]; p != NULL && dcount != 0;
3854 p = p->next, ioc_state++, dcount--, dcount2++)
3855 ipfw_copy_state(p, ioc_state);
3858 lockmgr(&dyn_lock, LK_RELEASE);
3861 * The # of dynamic rules may be shrinked after the
3862 * snapshot of 'dyn_count' was taken. To give user a
3863 * correct dynamic rule count, we use the 'dcount2'
3864 * calculated above (with shared lockmgr lock held).
3866 size = static_ioc_len +
3867 (dcount2 * sizeof(struct ipfw_ioc_state));
3868 KKASSERT(size <= old_size);
3871 sopt->sopt_valsize = size;
3876 ipfw_set_disable_dispatch(netmsg_t nmsg)
3878 struct lwkt_msg *lmsg = &nmsg->lmsg;
3879 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3882 ctx->ipfw_set_disable = lmsg->u.ms_result32;
3884 ifnet_forwardmsg(lmsg, mycpuid + 1);
3888 ipfw_ctl_set_disable(uint32_t disable, uint32_t enable)
3890 struct netmsg_base nmsg;
3891 struct lwkt_msg *lmsg;
3892 uint32_t set_disable;
3894 /* IPFW_DEFAULT_SET is always enabled */
3895 enable |= (1 << IPFW_DEFAULT_SET);
3896 set_disable = (ipfw_ctx[mycpuid]->ipfw_set_disable | disable) & ~enable;
3898 bzero(&nmsg, sizeof(nmsg));
3899 netmsg_init(&nmsg, NULL, &curthread->td_msgport,
3900 0, ipfw_set_disable_dispatch);
3902 lmsg->u.ms_result32 = set_disable;
3904 ifnet_domsg(lmsg, 0);
3908 * {set|get}sockopt parser.
3911 ipfw_ctl(struct sockopt *sopt)
3919 switch (sopt->sopt_name) {
3921 error = ipfw_ctl_get_rules(sopt);
3925 ipfw_flush(0 /* keep default rule */);
3929 error = ipfw_ctl_add_rule(sopt);
3934 * IP_FW_DEL is used for deleting single rules or sets,
3935 * and (ab)used to atomically manipulate sets.
3936 * Argument size is used to distinguish between the two:
3938 * delete single rule or set of rules,
3939 * or reassign rules (or sets) to a different set.
3940 * 2 * sizeof(uint32_t)
3941 * atomic disable/enable sets.
3942 * first uint32_t contains sets to be disabled,
3943 * second uint32_t contains sets to be enabled.
3945 masks = sopt->sopt_val;
3946 size = sopt->sopt_valsize;
3947 if (size == sizeof(*masks)) {
3949 * Delete or reassign static rule
3951 error = ipfw_ctl_alter(masks[0]);
3952 } else if (size == (2 * sizeof(*masks))) {
3954 * Set enable/disable
3956 ipfw_ctl_set_disable(masks[0], masks[1]);
3963 case IP_FW_RESETLOG: /* argument is an int, the rule number */
3966 if (sopt->sopt_val != 0) {
3967 error = soopt_to_kbuf(sopt, &rulenum,
3968 sizeof(int), sizeof(int));
3972 error = ipfw_ctl_zero_entry(rulenum,
3973 sopt->sopt_name == IP_FW_RESETLOG);
3977 kprintf("ipfw_ctl invalid option %d\n", sopt->sopt_name);
3984 * This procedure is only used to handle keepalives. It is invoked
3985 * every dyn_keepalive_period
3988 ipfw_tick_dispatch(netmsg_t nmsg)
3994 IPFW_ASSERT_CFGPORT(&curthread->td_msgport);
3995 KKASSERT(IPFW_LOADED);
3999 lwkt_replymsg(&nmsg->lmsg, 0);
4002 if (ipfw_dyn_v == NULL || dyn_count == 0)
4005 keep_alive = time_second;
4007 lockmgr(&dyn_lock, LK_EXCLUSIVE);
4009 if (ipfw_dyn_v == NULL || dyn_count == 0) {
4010 lockmgr(&dyn_lock, LK_RELEASE);
4013 gen = dyn_buckets_gen;
4015 for (i = 0; i < curr_dyn_buckets; i++) {
4016 ipfw_dyn_rule *q, *prev;
4018 for (prev = NULL, q = ipfw_dyn_v[i]; q != NULL;) {
4019 uint32_t ack_rev, ack_fwd;
4020 struct ipfw_flow_id id;
4022 if (q->dyn_type == O_LIMIT_PARENT)
4025 if (TIME_LEQ(q->expire, time_second)) {
4027 UNLINK_DYN_RULE(prev, ipfw_dyn_v[i], q);
4032 * Keep alive processing
4037 if (q->id.proto != IPPROTO_TCP)
4039 if ((q->state & BOTH_SYN) != BOTH_SYN)
4041 if (TIME_LEQ(time_second + dyn_keepalive_interval,
4043 goto next; /* too early */
4044 if (q->keep_alive == keep_alive)
4045 goto next; /* alreay done */
4048 * Save necessary information, so that they could
4049 * survive after possible blocking in send_pkt()
4052 ack_rev = q->ack_rev;
4053 ack_fwd = q->ack_fwd;
4055 /* Sending has been started */
4056 q->keep_alive = keep_alive;
4058 /* Release lock to avoid possible dead lock */
4059 lockmgr(&dyn_lock, LK_RELEASE);
4060 send_pkt(&id, ack_rev - 1, ack_fwd, TH_SYN);
4061 send_pkt(&id, ack_fwd - 1, ack_rev, 0);
4062 lockmgr(&dyn_lock, LK_EXCLUSIVE);
4064 if (gen != dyn_buckets_gen) {
4066 * Dyn bucket array has been changed during
4067 * the above two sending; reiterate.
4076 lockmgr(&dyn_lock, LK_RELEASE);
4078 callout_reset(&ipfw_timeout_h, dyn_keepalive_period * hz,
4083 * This procedure is only used to handle keepalives. It is invoked
4084 * every dyn_keepalive_period
4087 ipfw_tick(void *dummy __unused)
4089 struct lwkt_msg *lmsg = &ipfw_timeout_netmsg.lmsg;
4091 KKASSERT(mycpuid == IPFW_CFGCPUID);
4095 KKASSERT(lmsg->ms_flags & MSGF_DONE);
4097 lwkt_sendmsg(IPFW_CFGPORT, lmsg);
4098 /* ipfw_timeout_netmsg's handler reset this callout */
4105 ipfw_check_in(void *arg, struct mbuf **m0, struct ifnet *ifp, int dir)
4107 struct ip_fw_args args;
4108 struct mbuf *m = *m0;
4110 int tee = 0, error = 0, ret;
4112 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
4113 /* Extract info from dummynet tag */
4114 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
4115 KKASSERT(mtag != NULL);
4116 args.rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
4117 KKASSERT(args.rule != NULL);
4119 m_tag_delete(m, mtag);
4120 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED;
4128 ret = ipfw_chk(&args);
4146 case IP_FW_DUMMYNET:
4147 /* Send packet to the appropriate pipe */
4148 ipfw_dummynet_io(m, args.cookie, DN_TO_IP_IN, &args);
4157 * Must clear bridge tag when changing
4159 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED;
4160 if (ip_divert_p != NULL) {
4161 m = ip_divert_p(m, tee, 1);
4165 /* not sure this is the right error msg */
4171 panic("unknown ipfw return value: %d", ret);
4179 ipfw_check_out(void *arg, struct mbuf **m0, struct ifnet *ifp, int dir)
4181 struct ip_fw_args args;
4182 struct mbuf *m = *m0;
4184 int tee = 0, error = 0, ret;
4186 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
4187 /* Extract info from dummynet tag */
4188 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
4189 KKASSERT(mtag != NULL);
4190 args.rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
4191 KKASSERT(args.rule != NULL);
4193 m_tag_delete(m, mtag);
4194 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED;
4202 ret = ipfw_chk(&args);
4220 case IP_FW_DUMMYNET:
4221 ipfw_dummynet_io(m, args.cookie, DN_TO_IP_OUT, &args);
4229 if (ip_divert_p != NULL) {
4230 m = ip_divert_p(m, tee, 0);
4234 /* not sure this is the right error msg */
4240 panic("unknown ipfw return value: %d", ret);
4250 struct pfil_head *pfh;
4252 IPFW_ASSERT_CFGPORT(&curthread->td_msgport);
4254 pfh = pfil_head_get(PFIL_TYPE_AF, AF_INET);
4258 pfil_add_hook(ipfw_check_in, NULL, PFIL_IN | PFIL_MPSAFE, pfh);
4259 pfil_add_hook(ipfw_check_out, NULL, PFIL_OUT | PFIL_MPSAFE, pfh);
4265 struct pfil_head *pfh;
4267 IPFW_ASSERT_CFGPORT(&curthread->td_msgport);
4269 pfh = pfil_head_get(PFIL_TYPE_AF, AF_INET);
4273 pfil_remove_hook(ipfw_check_in, NULL, PFIL_IN, pfh);
4274 pfil_remove_hook(ipfw_check_out, NULL, PFIL_OUT, pfh);
4278 ipfw_sysctl_enable_dispatch(netmsg_t nmsg)
4280 struct lwkt_msg *lmsg = &nmsg->lmsg;
4281 int enable = lmsg->u.ms_result;
4283 if (fw_enable == enable)
4292 lwkt_replymsg(lmsg, 0);
4296 ipfw_sysctl_enable(SYSCTL_HANDLER_ARGS)
4298 struct netmsg_base nmsg;
4299 struct lwkt_msg *lmsg;
4303 error = sysctl_handle_int(oidp, &enable, 0, req);
4304 if (error || req->newptr == NULL)
4307 netmsg_init(&nmsg, NULL, &curthread->td_msgport,
4308 0, ipfw_sysctl_enable_dispatch);
4310 lmsg->u.ms_result = enable;
4312 return lwkt_domsg(IPFW_CFGPORT, lmsg, 0);
4316 ipfw_sysctl_autoinc_step(SYSCTL_HANDLER_ARGS)
4318 return sysctl_int_range(oidp, arg1, arg2, req,
4319 IPFW_AUTOINC_STEP_MIN, IPFW_AUTOINC_STEP_MAX);
4323 ipfw_sysctl_dyn_buckets(SYSCTL_HANDLER_ARGS)
4327 lockmgr(&dyn_lock, LK_EXCLUSIVE);
4329 value = dyn_buckets;
4330 error = sysctl_handle_int(oidp, &value, 0, req);
4331 if (error || !req->newptr)
4335 * Make sure we have a power of 2 and
4336 * do not allow more than 64k entries.
4339 if (value <= 1 || value > 65536)
4341 if ((value & (value - 1)) != 0)
4345 dyn_buckets = value;
4347 lockmgr(&dyn_lock, LK_RELEASE);
4352 ipfw_sysctl_dyn_fin(SYSCTL_HANDLER_ARGS)
4354 return sysctl_int_range(oidp, arg1, arg2, req,
4355 1, dyn_keepalive_period - 1);
4359 ipfw_sysctl_dyn_rst(SYSCTL_HANDLER_ARGS)
4361 return sysctl_int_range(oidp, arg1, arg2, req,
4362 1, dyn_keepalive_period - 1);
4366 ipfw_ctx_init_dispatch(netmsg_t nmsg)
4368 struct netmsg_ipfw *fwmsg = (struct netmsg_ipfw *)nmsg;
4369 struct ipfw_context *ctx;
4370 struct ip_fw *def_rule;
4372 ctx = kmalloc(sizeof(*ctx), M_IPFW, M_WAITOK | M_ZERO);
4373 ipfw_ctx[mycpuid] = ctx;
4375 def_rule = kmalloc(sizeof(*def_rule), M_IPFW, M_WAITOK | M_ZERO);
4377 def_rule->act_ofs = 0;
4378 def_rule->rulenum = IPFW_DEFAULT_RULE;
4379 def_rule->cmd_len = 1;
4380 def_rule->set = IPFW_DEFAULT_SET;
4382 def_rule->cmd[0].len = 1;
4383 #ifdef IPFIREWALL_DEFAULT_TO_ACCEPT
4384 def_rule->cmd[0].opcode = O_ACCEPT;
4386 def_rule->cmd[0].opcode = O_DENY;
4389 def_rule->refcnt = 1;
4390 def_rule->cpuid = mycpuid;
4392 /* Install the default rule */
4393 ctx->ipfw_default_rule = def_rule;
4394 ctx->ipfw_layer3_chain = def_rule;
4396 /* Link rule CPU sibling */
4397 ipfw_link_sibling(fwmsg, def_rule);
4399 /* Statistics only need to be updated once */
4401 ipfw_inc_static_count(def_rule);
4403 ifnet_forwardmsg(&nmsg->lmsg, mycpuid + 1);
4407 ipfw_init_dispatch(netmsg_t nmsg)
4409 struct netmsg_ipfw fwmsg;
4413 kprintf("IP firewall already loaded\n");
4418 bzero(&fwmsg, sizeof(fwmsg));
4419 netmsg_init(&fwmsg.base, NULL, &curthread->td_msgport,
4420 0, ipfw_ctx_init_dispatch);
4421 ifnet_domsg(&fwmsg.base.lmsg, 0);
4423 ip_fw_chk_ptr = ipfw_chk;
4424 ip_fw_ctl_ptr = ipfw_ctl;
4425 ip_fw_dn_io_ptr = ipfw_dummynet_io;
4427 kprintf("ipfw2 initialized, default to %s, logging ",
4428 ipfw_ctx[mycpuid]->ipfw_default_rule->cmd[0].opcode ==
4429 O_ACCEPT ? "accept" : "deny");
4431 #ifdef IPFIREWALL_VERBOSE
4434 #ifdef IPFIREWALL_VERBOSE_LIMIT
4435 verbose_limit = IPFIREWALL_VERBOSE_LIMIT;
4437 if (fw_verbose == 0) {
4438 kprintf("disabled\n");
4439 } else if (verbose_limit == 0) {
4440 kprintf("unlimited\n");
4442 kprintf("limited to %d packets/entry by default\n",
4446 callout_init_mp(&ipfw_timeout_h);
4447 netmsg_init(&ipfw_timeout_netmsg, NULL, &netisr_adone_rport,
4448 MSGF_DROPABLE | MSGF_PRIORITY,
4449 ipfw_tick_dispatch);
4450 lockinit(&dyn_lock, "ipfw_dyn", 0, 0);
4453 callout_reset(&ipfw_timeout_h, hz, ipfw_tick, NULL);
4458 lwkt_replymsg(&nmsg->lmsg, error);
4464 struct netmsg_base smsg;
4466 netmsg_init(&smsg, NULL, &curthread->td_msgport,
4467 0, ipfw_init_dispatch);
4468 return lwkt_domsg(IPFW_CFGPORT, &smsg.lmsg, 0);
4474 ipfw_fini_dispatch(netmsg_t nmsg)
4478 if (ipfw_refcnt != 0) {
4486 callout_stop(&ipfw_timeout_h);
4488 netmsg_service_sync();
4491 if ((ipfw_timeout_netmsg.lmsg.ms_flags & MSGF_DONE) == 0) {
4493 * Callout message is pending; drop it
4495 lwkt_dropmsg(&ipfw_timeout_netmsg.lmsg);
4499 ip_fw_chk_ptr = NULL;
4500 ip_fw_ctl_ptr = NULL;
4501 ip_fw_dn_io_ptr = NULL;
4502 ipfw_flush(1 /* kill default rule */);
4504 /* Free pre-cpu context */
4505 for (cpu = 0; cpu < ncpus; ++cpu)
4506 kfree(ipfw_ctx[cpu], M_IPFW);
4508 kprintf("IP firewall unloaded\n");
4510 lwkt_replymsg(&nmsg->lmsg, error);
4516 struct netmsg_base smsg;
4518 netmsg_init(&smsg, NULL, &curthread->td_msgport,
4519 0, ipfw_fini_dispatch);
4520 return lwkt_domsg(IPFW_CFGPORT, &smsg.lmsg, 0);
4523 #endif /* KLD_MODULE */
4526 ipfw_modevent(module_t mod, int type, void *unused)
4537 kprintf("ipfw statically compiled, cannot unload\n");
4549 static moduledata_t ipfwmod = {
4554 DECLARE_MODULE(ipfw, ipfwmod, SI_SUB_PROTO_END, SI_ORDER_ANY);
4555 MODULE_VERSION(ipfw, 1);