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 $
26 * $DragonFly: src/sys/net/ipfw/ip_fw2.c,v 1.100 2008/11/22 11:03:35 sephe Exp $
30 * Implement IP packet firewall (new version)
36 #error IPFIREWALL requires INET.
39 #include <sys/param.h>
40 #include <sys/systm.h>
41 #include <sys/malloc.h>
43 #include <sys/kernel.h>
45 #include <sys/socket.h>
46 #include <sys/socketvar.h>
47 #include <sys/sysctl.h>
48 #include <sys/syslog.h>
49 #include <sys/thread2.h>
50 #include <sys/ucred.h>
51 #include <sys/in_cksum.h>
55 #include <net/route.h>
56 #include <net/netmsg2.h>
58 #include <net/dummynet/ip_dummynet.h>
60 #include <netinet/in.h>
61 #include <netinet/in_systm.h>
62 #include <netinet/in_var.h>
63 #include <netinet/in_pcb.h>
64 #include <netinet/ip.h>
65 #include <netinet/ip_var.h>
66 #include <netinet/ip_icmp.h>
67 #include <netinet/tcp.h>
68 #include <netinet/tcp_timer.h>
69 #include <netinet/tcp_var.h>
70 #include <netinet/tcpip.h>
71 #include <netinet/udp.h>
72 #include <netinet/udp_var.h>
73 #include <netinet/ip_divert.h>
74 #include <netinet/if_ether.h> /* XXX for ETHERTYPE_IP */
76 #include <net/ipfw/ip_fw2.h>
78 #ifdef IPFIREWALL_DEBUG
79 #define DPRINTF(fmt, ...) \
82 kprintf(fmt, __VA_ARGS__); \
85 #define DPRINTF(fmt, ...) ((void)0)
89 * Description about per-CPU rule duplication:
91 * Module loading/unloading and all ioctl operations are serialized
92 * by netisr0, so we don't have any ordering or locking problems.
94 * Following graph shows how operation on per-CPU rule list is
95 * performed [2 CPU case]:
99 * netisr0 <------------------------------------+
110 * forwardmsg---------->ifnet1 |
115 * replymsg--------------+
120 * Rules which will not create states (dyn rules) [2 CPU case]
123 * layer3_chain layer3_chain
126 * +-------+ sibling +-------+ sibling
127 * | rule1 |--------->| rule1 |--------->NULL
128 * +-------+ +-------+
132 * +-------+ sibling +-------+ sibling
133 * | rule2 |--------->| rule2 |--------->NULL
134 * +-------+ +-------+
137 * 1) Ease statistics calculation during IP_FW_GET. We only need to
138 * iterate layer3_chain on CPU0; the current rule's duplication on
139 * the other CPUs could safely be read-only accessed by using
141 * 2) Accelerate rule insertion and deletion, e.g. rule insertion:
142 * a) In netisr0 (on CPU0) rule3 is determined to be inserted between
143 * rule1 and rule2. To make this decision we need to iterate the
144 * layer3_chain on CPU0. The netmsg, which is used to insert the
145 * rule, will contain rule1 on CPU0 as prev_rule and rule2 on CPU0
147 * b) After the insertion on CPU0 is done, we will move on to CPU1.
148 * But instead of relocating the rule3's position on CPU1 by
149 * iterating the layer3_chain on CPU1, we set the netmsg's prev_rule
150 * to rule1->sibling and next_rule to rule2->sibling before the
151 * netmsg is forwarded to CPU1 from CPU0
155 * Rules which will create states (dyn rules) [2 CPU case]
156 * (unnecessary parts are omitted; they are same as in the previous figure)
160 * +-------+ +-------+
161 * | rule1 | | rule1 |
162 * +-------+ +-------+
169 * | +--------------------+ |
171 * | | (read-only shared) | |
173 * | | back pointer array | |
174 * | | (indexed by cpuid) | |
176 * +----|---------[0] | |
177 * | [1]--------|----+
179 * +--------------------+
182 * ........|............|............
186 * : +---------+ +---------+ :
187 * : | state1a | | state1b | .... :
188 * : +---------+ +---------+ :
192 * : (protected by dyn_lock) :
193 * ..................................
195 * [state1a and state1b are states created by rule1]
198 * This structure is introduced so that shared (locked) state table could
199 * work with per-CPU (duplicated) static rules. It mainly bridges states
200 * and static rules and serves as static rule's place holder (a read-only
201 * shared part of duplicated rules) from states point of view.
203 * IPFW_RULE_F_STATE (only for rules which create states):
204 * o During rule installation, this flag is turned on after rule's
205 * duplications reach all CPUs, to avoid at least following race:
206 * 1) rule1 is duplicated on CPU0 and is not duplicated on CPU1 yet
207 * 2) rule1 creates state1
208 * 3) state1 is located on CPU1 by check-state
209 * But rule1 is not duplicated on CPU1 yet
210 * o During rule deletion, this flag is turned off before deleting states
211 * created by the rule and before deleting the rule itself, so no
212 * more states will be created by the to-be-deleted rule even when its
213 * duplication on certain CPUs are not eliminated yet.
216 #define IPFW_AUTOINC_STEP_MIN 1
217 #define IPFW_AUTOINC_STEP_MAX 1000
218 #define IPFW_AUTOINC_STEP_DEF 100
220 #define IPFW_DEFAULT_RULE 65535 /* rulenum for the default rule */
221 #define IPFW_DEFAULT_SET 31 /* set number for the default rule */
225 const struct ipfw_ioc_rule *ioc_rule;
226 struct ip_fw *next_rule;
227 struct ip_fw *prev_rule;
228 struct ip_fw *sibling;
229 struct ip_fw_stub *stub;
234 struct ip_fw *start_rule;
235 struct ip_fw *prev_rule;
243 struct ip_fw *start_rule;
248 struct ipfw_context {
249 struct ip_fw *ipfw_layer3_chain; /* list of rules for layer3 */
250 struct ip_fw *ipfw_default_rule; /* default rule */
251 uint64_t ipfw_norule_counter; /* counter for ipfw_log(NULL) */
254 * ipfw_set_disable contains one bit per set value (0..31).
255 * If the bit is set, all rules with the corresponding set
256 * are disabled. Set IPDW_DEFAULT_SET is reserved for the
257 * default rule and CANNOT be disabled.
259 uint32_t ipfw_set_disable;
260 uint32_t ipfw_gen; /* generation of rule list */
263 static struct ipfw_context *ipfw_ctx[MAXCPU];
267 * Module can not be unloaded, if there are references to
268 * certains rules of ipfw(4), e.g. dummynet(4)
270 static int ipfw_refcnt;
273 MALLOC_DEFINE(M_IPFW, "IpFw/IpAcct", "IpFw/IpAcct chain's");
276 * Following two global variables are accessed and
277 * updated only on CPU0
279 static uint32_t static_count; /* # of static rules */
280 static uint32_t static_ioc_len; /* bytes of static rules */
283 * If 1, then ipfw static rules are being flushed,
284 * ipfw_chk() will skip to the default rule.
286 static int ipfw_flushing;
288 static int fw_verbose;
289 static int verbose_limit;
292 static int autoinc_step = IPFW_AUTOINC_STEP_DEF;
294 static int ipfw_sysctl_enable(SYSCTL_HANDLER_ARGS);
295 static int ipfw_sysctl_autoinc_step(SYSCTL_HANDLER_ARGS);
296 static int ipfw_sysctl_dyn_buckets(SYSCTL_HANDLER_ARGS);
297 static int ipfw_sysctl_dyn_fin(SYSCTL_HANDLER_ARGS);
298 static int ipfw_sysctl_dyn_rst(SYSCTL_HANDLER_ARGS);
300 SYSCTL_NODE(_net_inet_ip, OID_AUTO, fw, CTLFLAG_RW, 0, "Firewall");
301 SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, enable, CTLTYPE_INT | CTLFLAG_RW,
302 &fw_enable, 0, ipfw_sysctl_enable, "I", "Enable ipfw");
303 SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, autoinc_step, CTLTYPE_INT | CTLFLAG_RW,
304 &autoinc_step, 0, ipfw_sysctl_autoinc_step, "I",
305 "Rule number autincrement step");
306 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO,one_pass,CTLFLAG_RW,
308 "Only do a single pass through ipfw when using dummynet(4)");
309 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, debug, CTLFLAG_RW,
310 &fw_debug, 0, "Enable printing of debug ip_fw statements");
311 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, verbose, CTLFLAG_RW,
312 &fw_verbose, 0, "Log matches to ipfw rules");
313 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, verbose_limit, CTLFLAG_RW,
314 &verbose_limit, 0, "Set upper limit of matches of ipfw rules logged");
317 * Description of dynamic rules.
319 * Dynamic rules are stored in lists accessed through a hash table
320 * (ipfw_dyn_v) whose size is curr_dyn_buckets. This value can
321 * be modified through the sysctl variable dyn_buckets which is
322 * updated when the table becomes empty.
324 * XXX currently there is only one list, ipfw_dyn.
326 * When a packet is received, its address fields are first masked
327 * with the mask defined for the rule, then hashed, then matched
328 * against the entries in the corresponding list.
329 * Dynamic rules can be used for different purposes:
331 * + enforcing limits on the number of sessions;
332 * + in-kernel NAT (not implemented yet)
334 * The lifetime of dynamic rules is regulated by dyn_*_lifetime,
335 * measured in seconds and depending on the flags.
337 * The total number of dynamic rules is stored in dyn_count.
338 * The max number of dynamic rules is dyn_max. When we reach
339 * the maximum number of rules we do not create anymore. This is
340 * done to avoid consuming too much memory, but also too much
341 * time when searching on each packet (ideally, we should try instead
342 * to put a limit on the length of the list on each bucket...).
344 * Each dynamic rule holds a pointer to the parent ipfw rule so
345 * we know what action to perform. Dynamic rules are removed when
346 * the parent rule is deleted. XXX we should make them survive.
348 * There are some limitations with dynamic rules -- we do not
349 * obey the 'randomized match', and we do not do multiple
350 * passes through the firewall. XXX check the latter!!!
352 * NOTE about the SHARED LOCKMGR LOCK during dynamic rule looking up:
353 * Only TCP state transition will change dynamic rule's state and ack
354 * sequences, while all packets of one TCP connection only goes through
355 * one TCP thread, so it is safe to use shared lockmgr lock during dynamic
356 * rule looking up. The keep alive callout uses exclusive lockmgr lock
357 * when it tries to find suitable dynamic rules to send keep alive, so
358 * it will not see half updated state and ack sequences. Though the expire
359 * field updating looks racy for other protocols, the resolution (second)
360 * of expire field makes this kind of race harmless.
361 * XXX statistics' updating is _not_ MPsafe!!!
362 * XXX once UDP output path is fixed, we could use lockless dynamic rule
365 static ipfw_dyn_rule **ipfw_dyn_v = NULL;
366 static uint32_t dyn_buckets = 256; /* must be power of 2 */
367 static uint32_t curr_dyn_buckets = 256; /* must be power of 2 */
368 static uint32_t dyn_buckets_gen; /* generation of dyn buckets array */
369 static struct lock dyn_lock; /* dynamic rules' hash table lock */
371 static struct netmsg ipfw_timeout_netmsg; /* schedule ipfw timeout */
372 static struct callout ipfw_timeout_h;
375 * Timeouts for various events in handing dynamic rules.
377 static uint32_t dyn_ack_lifetime = 300;
378 static uint32_t dyn_syn_lifetime = 20;
379 static uint32_t dyn_fin_lifetime = 1;
380 static uint32_t dyn_rst_lifetime = 1;
381 static uint32_t dyn_udp_lifetime = 10;
382 static uint32_t dyn_short_lifetime = 5;
385 * Keepalives are sent if dyn_keepalive is set. They are sent every
386 * dyn_keepalive_period seconds, in the last dyn_keepalive_interval
387 * seconds of lifetime of a rule.
388 * dyn_rst_lifetime and dyn_fin_lifetime should be strictly lower
389 * than dyn_keepalive_period.
392 static uint32_t dyn_keepalive_interval = 20;
393 static uint32_t dyn_keepalive_period = 5;
394 static uint32_t dyn_keepalive = 1; /* do send keepalives */
396 static uint32_t dyn_count; /* # of dynamic rules */
397 static uint32_t dyn_max = 4096; /* max # of dynamic rules */
399 SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, dyn_buckets, CTLTYPE_INT | CTLFLAG_RW,
400 &dyn_buckets, 0, ipfw_sysctl_dyn_buckets, "I", "Number of dyn. buckets");
401 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, curr_dyn_buckets, CTLFLAG_RD,
402 &curr_dyn_buckets, 0, "Current Number of dyn. buckets");
403 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_count, CTLFLAG_RD,
404 &dyn_count, 0, "Number of dyn. rules");
405 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_max, CTLFLAG_RW,
406 &dyn_max, 0, "Max number of dyn. rules");
407 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, static_count, CTLFLAG_RD,
408 &static_count, 0, "Number of static rules");
409 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_ack_lifetime, CTLFLAG_RW,
410 &dyn_ack_lifetime, 0, "Lifetime of dyn. rules for acks");
411 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_syn_lifetime, CTLFLAG_RW,
412 &dyn_syn_lifetime, 0, "Lifetime of dyn. rules for syn");
413 SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, dyn_fin_lifetime,
414 CTLTYPE_INT | CTLFLAG_RW, &dyn_fin_lifetime, 0, ipfw_sysctl_dyn_fin, "I",
415 "Lifetime of dyn. rules for fin");
416 SYSCTL_PROC(_net_inet_ip_fw, OID_AUTO, dyn_rst_lifetime,
417 CTLTYPE_INT | CTLFLAG_RW, &dyn_rst_lifetime, 0, ipfw_sysctl_dyn_rst, "I",
418 "Lifetime of dyn. rules for rst");
419 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_udp_lifetime, CTLFLAG_RW,
420 &dyn_udp_lifetime, 0, "Lifetime of dyn. rules for UDP");
421 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_short_lifetime, CTLFLAG_RW,
422 &dyn_short_lifetime, 0, "Lifetime of dyn. rules for other situations");
423 SYSCTL_INT(_net_inet_ip_fw, OID_AUTO, dyn_keepalive, CTLFLAG_RW,
424 &dyn_keepalive, 0, "Enable keepalives for dyn. rules");
426 static ip_fw_chk_t ipfw_chk;
427 static void ipfw_tick(void *);
430 ipfw_free_rule(struct ip_fw *rule)
432 KASSERT(rule->cpuid == mycpuid, ("rule freed on cpu%d\n", mycpuid));
433 KASSERT(rule->refcnt > 0, ("invalid refcnt %u\n", rule->refcnt));
435 if (rule->refcnt == 0) {
443 ipfw_unref_rule(void *priv)
445 ipfw_free_rule(priv);
447 atomic_subtract_int(&ipfw_refcnt, 1);
452 ipfw_ref_rule(struct ip_fw *rule)
454 KASSERT(rule->cpuid == mycpuid, ("rule used on cpu%d\n", mycpuid));
456 atomic_add_int(&ipfw_refcnt, 1);
462 * This macro maps an ip pointer into a layer3 header pointer of type T
464 #define L3HDR(T, ip) ((T *)((uint32_t *)(ip) + (ip)->ip_hl))
467 icmptype_match(struct ip *ip, ipfw_insn_u32 *cmd)
469 int type = L3HDR(struct icmp,ip)->icmp_type;
471 return (type <= ICMP_MAXTYPE && (cmd->d[0] & (1 << type)));
474 #define TT ((1 << ICMP_ECHO) | \
475 (1 << ICMP_ROUTERSOLICIT) | \
476 (1 << ICMP_TSTAMP) | \
481 is_icmp_query(struct ip *ip)
483 int type = L3HDR(struct icmp, ip)->icmp_type;
485 return (type <= ICMP_MAXTYPE && (TT & (1 << type)));
491 * The following checks use two arrays of 8 or 16 bits to store the
492 * bits that we want set or clear, respectively. They are in the
493 * low and high half of cmd->arg1 or cmd->d[0].
495 * We scan options and store the bits we find set. We succeed if
497 * (want_set & ~bits) == 0 && (want_clear & ~bits) == want_clear
499 * The code is sometimes optimized not to store additional variables.
503 flags_match(ipfw_insn *cmd, uint8_t bits)
508 if (((cmd->arg1 & 0xff) & bits) != 0)
509 return 0; /* some bits we want set were clear */
511 want_clear = (cmd->arg1 >> 8) & 0xff;
512 if ((want_clear & bits) != want_clear)
513 return 0; /* some bits we want clear were set */
518 ipopts_match(struct ip *ip, ipfw_insn *cmd)
520 int optlen, bits = 0;
521 u_char *cp = (u_char *)(ip + 1);
522 int x = (ip->ip_hl << 2) - sizeof(struct ip);
524 for (; x > 0; x -= optlen, cp += optlen) {
525 int opt = cp[IPOPT_OPTVAL];
527 if (opt == IPOPT_EOL)
530 if (opt == IPOPT_NOP) {
533 optlen = cp[IPOPT_OLEN];
534 if (optlen <= 0 || optlen > x)
535 return 0; /* invalid or truncated */
540 bits |= IP_FW_IPOPT_LSRR;
544 bits |= IP_FW_IPOPT_SSRR;
548 bits |= IP_FW_IPOPT_RR;
552 bits |= IP_FW_IPOPT_TS;
559 return (flags_match(cmd, bits));
563 tcpopts_match(struct ip *ip, ipfw_insn *cmd)
565 int optlen, bits = 0;
566 struct tcphdr *tcp = L3HDR(struct tcphdr,ip);
567 u_char *cp = (u_char *)(tcp + 1);
568 int x = (tcp->th_off << 2) - sizeof(struct tcphdr);
570 for (; x > 0; x -= optlen, cp += optlen) {
573 if (opt == TCPOPT_EOL)
576 if (opt == TCPOPT_NOP) {
586 bits |= IP_FW_TCPOPT_MSS;
590 bits |= IP_FW_TCPOPT_WINDOW;
593 case TCPOPT_SACK_PERMITTED:
595 bits |= IP_FW_TCPOPT_SACK;
598 case TCPOPT_TIMESTAMP:
599 bits |= IP_FW_TCPOPT_TS;
605 bits |= IP_FW_TCPOPT_CC;
612 return (flags_match(cmd, bits));
616 iface_match(struct ifnet *ifp, ipfw_insn_if *cmd)
618 if (ifp == NULL) /* no iface with this packet, match fails */
621 /* Check by name or by IP address */
622 if (cmd->name[0] != '\0') { /* match by name */
625 if (kfnmatch(cmd->name, ifp->if_xname, 0) == 0)
628 if (strncmp(ifp->if_xname, cmd->name, IFNAMSIZ) == 0)
632 struct ifaddr_container *ifac;
634 TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) {
635 struct ifaddr *ia = ifac->ifa;
637 if (ia->ifa_addr == NULL)
639 if (ia->ifa_addr->sa_family != AF_INET)
641 if (cmd->p.ip.s_addr == ((struct sockaddr_in *)
642 (ia->ifa_addr))->sin_addr.s_addr)
643 return(1); /* match */
646 return(0); /* no match, fail ... */
649 #define SNPARGS(buf, len) buf + len, sizeof(buf) > len ? sizeof(buf) - len : 0
652 * We enter here when we have a rule with O_LOG.
653 * XXX this function alone takes about 2Kbytes of code!
656 ipfw_log(struct ip_fw *f, u_int hlen, struct ether_header *eh,
657 struct mbuf *m, struct ifnet *oif)
660 int limit_reached = 0;
661 char action2[40], proto[48], fragment[28];
666 if (f == NULL) { /* bogus pkt */
667 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
669 if (verbose_limit != 0 &&
670 ctx->ipfw_norule_counter >= verbose_limit)
672 ctx->ipfw_norule_counter++;
673 if (ctx->ipfw_norule_counter == verbose_limit)
674 limit_reached = verbose_limit;
676 } else { /* O_LOG is the first action, find the real one */
677 ipfw_insn *cmd = ACTION_PTR(f);
678 ipfw_insn_log *l = (ipfw_insn_log *)cmd;
680 if (l->max_log != 0 && l->log_left == 0)
683 if (l->log_left == 0)
684 limit_reached = l->max_log;
685 cmd += F_LEN(cmd); /* point to first action */
686 if (cmd->opcode == O_PROB)
690 switch (cmd->opcode) {
696 if (cmd->arg1==ICMP_REJECT_RST) {
698 } else if (cmd->arg1==ICMP_UNREACH_HOST) {
701 ksnprintf(SNPARGS(action2, 0), "Unreach %d",
715 ksnprintf(SNPARGS(action2, 0), "Divert %d", cmd->arg1);
719 ksnprintf(SNPARGS(action2, 0), "Tee %d", cmd->arg1);
723 ksnprintf(SNPARGS(action2, 0), "SkipTo %d", cmd->arg1);
727 ksnprintf(SNPARGS(action2, 0), "Pipe %d", cmd->arg1);
731 ksnprintf(SNPARGS(action2, 0), "Queue %d", cmd->arg1);
736 ipfw_insn_sa *sa = (ipfw_insn_sa *)cmd;
739 len = ksnprintf(SNPARGS(action2, 0),
741 inet_ntoa(sa->sa.sin_addr));
742 if (sa->sa.sin_port) {
743 ksnprintf(SNPARGS(action2, len), ":%d",
755 if (hlen == 0) { /* non-ip */
756 ksnprintf(SNPARGS(proto, 0), "MAC");
758 struct ip *ip = mtod(m, struct ip *);
759 /* these three are all aliases to the same thing */
760 struct icmp *const icmp = L3HDR(struct icmp, ip);
761 struct tcphdr *const tcp = (struct tcphdr *)icmp;
762 struct udphdr *const udp = (struct udphdr *)icmp;
764 int ip_off, offset, ip_len;
767 if (eh != NULL) { /* layer 2 packets are as on the wire */
768 ip_off = ntohs(ip->ip_off);
769 ip_len = ntohs(ip->ip_len);
774 offset = ip_off & IP_OFFMASK;
777 len = ksnprintf(SNPARGS(proto, 0), "TCP %s",
778 inet_ntoa(ip->ip_src));
780 ksnprintf(SNPARGS(proto, len), ":%d %s:%d",
781 ntohs(tcp->th_sport),
782 inet_ntoa(ip->ip_dst),
783 ntohs(tcp->th_dport));
785 ksnprintf(SNPARGS(proto, len), " %s",
786 inet_ntoa(ip->ip_dst));
791 len = ksnprintf(SNPARGS(proto, 0), "UDP %s",
792 inet_ntoa(ip->ip_src));
794 ksnprintf(SNPARGS(proto, len), ":%d %s:%d",
795 ntohs(udp->uh_sport),
796 inet_ntoa(ip->ip_dst),
797 ntohs(udp->uh_dport));
799 ksnprintf(SNPARGS(proto, len), " %s",
800 inet_ntoa(ip->ip_dst));
806 len = ksnprintf(SNPARGS(proto, 0),
811 len = ksnprintf(SNPARGS(proto, 0), "ICMP ");
813 len += ksnprintf(SNPARGS(proto, len), "%s",
814 inet_ntoa(ip->ip_src));
815 ksnprintf(SNPARGS(proto, len), " %s",
816 inet_ntoa(ip->ip_dst));
820 len = ksnprintf(SNPARGS(proto, 0), "P:%d %s", ip->ip_p,
821 inet_ntoa(ip->ip_src));
822 ksnprintf(SNPARGS(proto, len), " %s",
823 inet_ntoa(ip->ip_dst));
827 if (ip_off & (IP_MF | IP_OFFMASK)) {
828 ksnprintf(SNPARGS(fragment, 0), " (frag %d:%d@%d%s)",
829 ntohs(ip->ip_id), ip_len - (ip->ip_hl << 2),
830 offset << 3, (ip_off & IP_MF) ? "+" : "");
834 if (oif || m->m_pkthdr.rcvif) {
835 log(LOG_SECURITY | LOG_INFO,
836 "ipfw: %d %s %s %s via %s%s\n",
838 action, proto, oif ? "out" : "in",
839 oif ? oif->if_xname : m->m_pkthdr.rcvif->if_xname,
842 log(LOG_SECURITY | LOG_INFO,
843 "ipfw: %d %s %s [no if info]%s\n",
845 action, proto, fragment);
849 log(LOG_SECURITY | LOG_NOTICE,
850 "ipfw: limit %d reached on entry %d\n",
851 limit_reached, f ? f->rulenum : -1);
858 * IMPORTANT: the hash function for dynamic rules must be commutative
859 * in source and destination (ip,port), because rules are bidirectional
860 * and we want to find both in the same bucket.
863 hash_packet(struct ipfw_flow_id *id)
867 i = (id->dst_ip) ^ (id->src_ip) ^ (id->dst_port) ^ (id->src_port);
868 i &= (curr_dyn_buckets - 1);
873 * unlink a dynamic rule from a chain. prev is a pointer to
874 * the previous one, q is a pointer to the rule to delete,
875 * head is a pointer to the head of the queue.
876 * Modifies q and potentially also head.
878 #define UNLINK_DYN_RULE(prev, head, q) \
880 ipfw_dyn_rule *old_q = q; \
882 /* remove a refcount to the parent */ \
883 if (q->dyn_type == O_LIMIT) \
884 q->parent->count--; \
885 DPRINTF("-- unlink entry 0x%08x %d -> 0x%08x %d, %d left\n", \
886 q->id.src_ip, q->id.src_port, \
887 q->id.dst_ip, q->id.dst_port, dyn_count - 1); \
889 prev->next = q = q->next; \
891 head = q = q->next; \
892 KASSERT(dyn_count > 0, ("invalid dyn count %u\n", dyn_count)); \
894 kfree(old_q, M_IPFW); \
897 #define TIME_LEQ(a, b) ((int)((a) - (b)) <= 0)
900 * Remove dynamic rules pointing to "rule", or all of them if rule == NULL.
902 * If keep_me == NULL, rules are deleted even if not expired,
903 * otherwise only expired rules are removed.
905 * The value of the second parameter is also used to point to identify
906 * a rule we absolutely do not want to remove (e.g. because we are
907 * holding a reference to it -- this is the case with O_LIMIT_PARENT
908 * rules). The pointer is only used for comparison, so any non-null
912 remove_dyn_rule_locked(struct ip_fw *rule, ipfw_dyn_rule *keep_me)
914 static uint32_t last_remove = 0; /* XXX */
916 #define FORCE (keep_me == NULL)
918 ipfw_dyn_rule *prev, *q;
919 int i, pass = 0, max_pass = 0, unlinked = 0;
921 if (ipfw_dyn_v == NULL || dyn_count == 0)
923 /* do not expire more than once per second, it is useless */
924 if (!FORCE && last_remove == time_second)
926 last_remove = time_second;
929 * because O_LIMIT refer to parent rules, during the first pass only
930 * remove child and mark any pending LIMIT_PARENT, and remove
931 * them in a second pass.
934 for (i = 0; i < curr_dyn_buckets; i++) {
935 for (prev = NULL, q = ipfw_dyn_v[i]; q;) {
937 * Logic can become complex here, so we split tests.
941 if (rule != NULL && rule->stub != q->stub)
942 goto next; /* not the one we are looking for */
943 if (q->dyn_type == O_LIMIT_PARENT) {
945 * handle parent in the second pass,
946 * record we need one.
951 if (FORCE && q->count != 0) {
952 /* XXX should not happen! */
953 kprintf("OUCH! cannot remove rule, "
954 "count %d\n", q->count);
957 if (!FORCE && !TIME_LEQ(q->expire, time_second))
961 UNLINK_DYN_RULE(prev, ipfw_dyn_v[i], q);
968 if (pass++ < max_pass)
978 * lookup a dynamic rule.
980 static ipfw_dyn_rule *
981 lookup_dyn_rule(struct ipfw_flow_id *pkt, int *match_direction,
985 * stateful ipfw extensions.
986 * Lookup into dynamic session queue
988 #define MATCH_REVERSE 0
989 #define MATCH_FORWARD 1
991 #define MATCH_UNKNOWN 3
992 int i, dir = MATCH_NONE;
993 ipfw_dyn_rule *prev, *q=NULL;
995 if (ipfw_dyn_v == NULL)
996 goto done; /* not found */
998 i = hash_packet(pkt);
999 for (prev = NULL, q = ipfw_dyn_v[i]; q != NULL;) {
1000 if (q->dyn_type == O_LIMIT_PARENT)
1003 if (TIME_LEQ(q->expire, time_second)) {
1005 * Entry expired; skip.
1006 * Let ipfw_tick() take care of it
1011 if (pkt->proto == q->id.proto) {
1012 if (pkt->src_ip == q->id.src_ip &&
1013 pkt->dst_ip == q->id.dst_ip &&
1014 pkt->src_port == q->id.src_port &&
1015 pkt->dst_port == q->id.dst_port) {
1016 dir = MATCH_FORWARD;
1019 if (pkt->src_ip == q->id.dst_ip &&
1020 pkt->dst_ip == q->id.src_ip &&
1021 pkt->src_port == q->id.dst_port &&
1022 pkt->dst_port == q->id.src_port) {
1023 dir = MATCH_REVERSE;
1032 goto done; /* q = NULL, not found */
1034 if (pkt->proto == IPPROTO_TCP) { /* update state according to flags */
1035 u_char flags = pkt->flags & (TH_FIN|TH_SYN|TH_RST);
1037 #define BOTH_SYN (TH_SYN | (TH_SYN << 8))
1038 #define BOTH_FIN (TH_FIN | (TH_FIN << 8))
1040 q->state |= (dir == MATCH_FORWARD ) ? flags : (flags << 8);
1042 case TH_SYN: /* opening */
1043 q->expire = time_second + dyn_syn_lifetime;
1046 case BOTH_SYN: /* move to established */
1047 case BOTH_SYN | TH_FIN : /* one side tries to close */
1048 case BOTH_SYN | (TH_FIN << 8) :
1050 uint32_t ack = ntohl(tcp->th_ack);
1052 #define _SEQ_GE(a, b) ((int)(a) - (int)(b) >= 0)
1054 if (dir == MATCH_FORWARD) {
1055 if (q->ack_fwd == 0 ||
1056 _SEQ_GE(ack, q->ack_fwd))
1058 else /* ignore out-of-sequence */
1061 if (q->ack_rev == 0 ||
1062 _SEQ_GE(ack, q->ack_rev))
1064 else /* ignore out-of-sequence */
1069 q->expire = time_second + dyn_ack_lifetime;
1072 case BOTH_SYN | BOTH_FIN: /* both sides closed */
1073 KKASSERT(dyn_fin_lifetime < dyn_keepalive_period);
1074 q->expire = time_second + dyn_fin_lifetime;
1080 * reset or some invalid combination, but can also
1081 * occur if we use keep-state the wrong way.
1083 if ((q->state & ((TH_RST << 8) | TH_RST)) == 0)
1084 kprintf("invalid state: 0x%x\n", q->state);
1086 KKASSERT(dyn_rst_lifetime < dyn_keepalive_period);
1087 q->expire = time_second + dyn_rst_lifetime;
1090 } else if (pkt->proto == IPPROTO_UDP) {
1091 q->expire = time_second + dyn_udp_lifetime;
1093 /* other protocols */
1094 q->expire = time_second + dyn_short_lifetime;
1097 if (match_direction)
1098 *match_direction = dir;
1102 static struct ip_fw *
1103 lookup_rule(struct ipfw_flow_id *pkt, int *match_direction, struct tcphdr *tcp,
1104 uint16_t len, int *deny)
1106 struct ip_fw *rule = NULL;
1108 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
1112 gen = ctx->ipfw_gen;
1114 lockmgr(&dyn_lock, LK_SHARED);
1116 if (ctx->ipfw_gen != gen) {
1118 * Static rules had been change when we were waiting
1119 * for the dynamic hash table lock; deny this packet,
1120 * since it is _not_ known whether it is safe to keep
1121 * iterating the static rules.
1127 q = lookup_dyn_rule(pkt, match_direction, tcp);
1131 rule = q->stub->rule[mycpuid];
1132 KKASSERT(rule->stub == q->stub && rule->cpuid == mycpuid);
1139 lockmgr(&dyn_lock, LK_RELEASE);
1144 realloc_dynamic_table(void)
1146 ipfw_dyn_rule **old_dyn_v;
1147 uint32_t old_curr_dyn_buckets;
1149 KASSERT(dyn_buckets <= 65536 && (dyn_buckets & (dyn_buckets - 1)) == 0,
1150 ("invalid dyn_buckets %d\n", dyn_buckets));
1152 /* Save the current buckets array for later error recovery */
1153 old_dyn_v = ipfw_dyn_v;
1154 old_curr_dyn_buckets = curr_dyn_buckets;
1156 curr_dyn_buckets = dyn_buckets;
1158 ipfw_dyn_v = kmalloc(curr_dyn_buckets * sizeof(ipfw_dyn_rule *),
1159 M_IPFW, M_NOWAIT | M_ZERO);
1160 if (ipfw_dyn_v != NULL || curr_dyn_buckets <= 2)
1163 curr_dyn_buckets /= 2;
1164 if (curr_dyn_buckets <= old_curr_dyn_buckets &&
1165 old_dyn_v != NULL) {
1167 * Don't try allocating smaller buckets array, reuse
1168 * the old one, which alreay contains enough buckets
1174 if (ipfw_dyn_v != NULL) {
1175 if (old_dyn_v != NULL)
1176 kfree(old_dyn_v, M_IPFW);
1178 /* Allocation failed, restore old buckets array */
1179 ipfw_dyn_v = old_dyn_v;
1180 curr_dyn_buckets = old_curr_dyn_buckets;
1183 if (ipfw_dyn_v != NULL)
1188 * Install state of type 'type' for a dynamic session.
1189 * The hash table contains two type of rules:
1190 * - regular rules (O_KEEP_STATE)
1191 * - rules for sessions with limited number of sess per user
1192 * (O_LIMIT). When they are created, the parent is
1193 * increased by 1, and decreased on delete. In this case,
1194 * the third parameter is the parent rule and not the chain.
1195 * - "parent" rules for the above (O_LIMIT_PARENT).
1197 static ipfw_dyn_rule *
1198 add_dyn_rule(struct ipfw_flow_id *id, uint8_t dyn_type, struct ip_fw *rule)
1203 if (ipfw_dyn_v == NULL ||
1204 (dyn_count == 0 && dyn_buckets != curr_dyn_buckets)) {
1205 realloc_dynamic_table();
1206 if (ipfw_dyn_v == NULL)
1207 return NULL; /* failed ! */
1209 i = hash_packet(id);
1211 r = kmalloc(sizeof(*r), M_IPFW, M_NOWAIT | M_ZERO);
1213 kprintf ("sorry cannot allocate state\n");
1217 /* increase refcount on parent, and set pointer */
1218 if (dyn_type == O_LIMIT) {
1219 ipfw_dyn_rule *parent = (ipfw_dyn_rule *)rule;
1221 if (parent->dyn_type != O_LIMIT_PARENT)
1222 panic("invalid parent");
1225 rule = parent->stub->rule[mycpuid];
1226 KKASSERT(rule->stub == parent->stub);
1228 KKASSERT(rule->cpuid == mycpuid && rule->stub != NULL);
1231 r->expire = time_second + dyn_syn_lifetime;
1232 r->stub = rule->stub;
1233 r->dyn_type = dyn_type;
1234 r->pcnt = r->bcnt = 0;
1238 r->next = ipfw_dyn_v[i];
1242 DPRINTF("-- add dyn entry ty %d 0x%08x %d -> 0x%08x %d, total %d\n",
1244 r->id.src_ip, r->id.src_port,
1245 r->id.dst_ip, r->id.dst_port, dyn_count);
1250 * lookup dynamic parent rule using pkt and rule as search keys.
1251 * If the lookup fails, then install one.
1253 static ipfw_dyn_rule *
1254 lookup_dyn_parent(struct ipfw_flow_id *pkt, struct ip_fw *rule)
1260 i = hash_packet(pkt);
1261 for (q = ipfw_dyn_v[i]; q != NULL; q = q->next) {
1262 if (q->dyn_type == O_LIMIT_PARENT &&
1263 rule->stub == q->stub &&
1264 pkt->proto == q->id.proto &&
1265 pkt->src_ip == q->id.src_ip &&
1266 pkt->dst_ip == q->id.dst_ip &&
1267 pkt->src_port == q->id.src_port &&
1268 pkt->dst_port == q->id.dst_port) {
1269 q->expire = time_second + dyn_short_lifetime;
1270 DPRINTF("lookup_dyn_parent found 0x%p\n", q);
1275 return add_dyn_rule(pkt, O_LIMIT_PARENT, rule);
1279 * Install dynamic state for rule type cmd->o.opcode
1281 * Returns 1 (failure) if state is not installed because of errors or because
1282 * session limitations are enforced.
1285 install_state_locked(struct ip_fw *rule, ipfw_insn_limit *cmd,
1286 struct ip_fw_args *args)
1288 static int last_log; /* XXX */
1292 DPRINTF("-- install state type %d 0x%08x %u -> 0x%08x %u\n",
1294 args->f_id.src_ip, args->f_id.src_port,
1295 args->f_id.dst_ip, args->f_id.dst_port);
1297 q = lookup_dyn_rule(&args->f_id, NULL, NULL);
1298 if (q != NULL) { /* should never occur */
1299 if (last_log != time_second) {
1300 last_log = time_second;
1301 kprintf(" install_state: entry already present, done\n");
1306 if (dyn_count >= dyn_max) {
1308 * Run out of slots, try to remove any expired rule.
1310 remove_dyn_rule_locked(NULL, (ipfw_dyn_rule *)1);
1311 if (dyn_count >= dyn_max) {
1312 if (last_log != time_second) {
1313 last_log = time_second;
1314 kprintf("install_state: "
1315 "Too many dynamic rules\n");
1317 return 1; /* cannot install, notify caller */
1321 switch (cmd->o.opcode) {
1322 case O_KEEP_STATE: /* bidir rule */
1323 if (add_dyn_rule(&args->f_id, O_KEEP_STATE, rule) == NULL)
1327 case O_LIMIT: /* limit number of sessions */
1329 uint16_t limit_mask = cmd->limit_mask;
1330 struct ipfw_flow_id id;
1331 ipfw_dyn_rule *parent;
1333 DPRINTF("installing dyn-limit rule %d\n",
1336 id.dst_ip = id.src_ip = 0;
1337 id.dst_port = id.src_port = 0;
1338 id.proto = args->f_id.proto;
1340 if (limit_mask & DYN_SRC_ADDR)
1341 id.src_ip = args->f_id.src_ip;
1342 if (limit_mask & DYN_DST_ADDR)
1343 id.dst_ip = args->f_id.dst_ip;
1344 if (limit_mask & DYN_SRC_PORT)
1345 id.src_port = args->f_id.src_port;
1346 if (limit_mask & DYN_DST_PORT)
1347 id.dst_port = args->f_id.dst_port;
1349 parent = lookup_dyn_parent(&id, rule);
1350 if (parent == NULL) {
1351 kprintf("add parent failed\n");
1355 if (parent->count >= cmd->conn_limit) {
1357 * See if we can remove some expired rule.
1359 remove_dyn_rule_locked(rule, parent);
1360 if (parent->count >= cmd->conn_limit) {
1362 last_log != time_second) {
1363 last_log = time_second;
1364 log(LOG_SECURITY | LOG_DEBUG,
1366 "too many entries\n");
1371 if (add_dyn_rule(&args->f_id, O_LIMIT,
1372 (struct ip_fw *)parent) == NULL)
1377 kprintf("unknown dynamic rule type %u\n", cmd->o.opcode);
1380 lookup_dyn_rule(&args->f_id, NULL, NULL); /* XXX just set lifetime */
1385 install_state(struct ip_fw *rule, ipfw_insn_limit *cmd,
1386 struct ip_fw_args *args, int *deny)
1388 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
1393 gen = ctx->ipfw_gen;
1395 lockmgr(&dyn_lock, LK_EXCLUSIVE);
1396 if (ctx->ipfw_gen != gen) {
1397 /* See the comment in lookup_rule() */
1400 ret = install_state_locked(rule, cmd, args);
1402 lockmgr(&dyn_lock, LK_RELEASE);
1408 * Transmit a TCP packet, containing either a RST or a keepalive.
1409 * When flags & TH_RST, we are sending a RST packet, because of a
1410 * "reset" action matched the packet.
1411 * Otherwise we are sending a keepalive, and flags & TH_
1414 send_pkt(struct ipfw_flow_id *id, uint32_t seq, uint32_t ack, int flags)
1419 struct route sro; /* fake route */
1421 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
1424 m->m_pkthdr.rcvif = NULL;
1425 m->m_pkthdr.len = m->m_len = sizeof(struct ip) + sizeof(struct tcphdr);
1426 m->m_data += max_linkhdr;
1428 ip = mtod(m, struct ip *);
1429 bzero(ip, m->m_len);
1430 tcp = (struct tcphdr *)(ip + 1); /* no IP options */
1431 ip->ip_p = IPPROTO_TCP;
1435 * Assume we are sending a RST (or a keepalive in the reverse
1436 * direction), swap src and destination addresses and ports.
1438 ip->ip_src.s_addr = htonl(id->dst_ip);
1439 ip->ip_dst.s_addr = htonl(id->src_ip);
1440 tcp->th_sport = htons(id->dst_port);
1441 tcp->th_dport = htons(id->src_port);
1442 if (flags & TH_RST) { /* we are sending a RST */
1443 if (flags & TH_ACK) {
1444 tcp->th_seq = htonl(ack);
1445 tcp->th_ack = htonl(0);
1446 tcp->th_flags = TH_RST;
1450 tcp->th_seq = htonl(0);
1451 tcp->th_ack = htonl(seq);
1452 tcp->th_flags = TH_RST | TH_ACK;
1456 * We are sending a keepalive. flags & TH_SYN determines
1457 * the direction, forward if set, reverse if clear.
1458 * NOTE: seq and ack are always assumed to be correct
1459 * as set by the caller. This may be confusing...
1461 if (flags & TH_SYN) {
1463 * we have to rewrite the correct addresses!
1465 ip->ip_dst.s_addr = htonl(id->dst_ip);
1466 ip->ip_src.s_addr = htonl(id->src_ip);
1467 tcp->th_dport = htons(id->dst_port);
1468 tcp->th_sport = htons(id->src_port);
1470 tcp->th_seq = htonl(seq);
1471 tcp->th_ack = htonl(ack);
1472 tcp->th_flags = TH_ACK;
1476 * set ip_len to the payload size so we can compute
1477 * the tcp checksum on the pseudoheader
1478 * XXX check this, could save a couple of words ?
1480 ip->ip_len = htons(sizeof(struct tcphdr));
1481 tcp->th_sum = in_cksum(m, m->m_pkthdr.len);
1484 * now fill fields left out earlier
1486 ip->ip_ttl = ip_defttl;
1487 ip->ip_len = m->m_pkthdr.len;
1489 bzero(&sro, sizeof(sro));
1490 ip_rtaddr(ip->ip_dst, &sro);
1492 m->m_pkthdr.fw_flags |= IPFW_MBUF_GENERATED;
1493 ip_output(m, NULL, &sro, 0, NULL, NULL);
1499 * sends a reject message, consuming the mbuf passed as an argument.
1502 send_reject(struct ip_fw_args *args, int code, int offset, int ip_len)
1504 if (code != ICMP_REJECT_RST) { /* Send an ICMP unreach */
1505 /* We need the IP header in host order for icmp_error(). */
1506 if (args->eh != NULL) {
1507 struct ip *ip = mtod(args->m, struct ip *);
1509 ip->ip_len = ntohs(ip->ip_len);
1510 ip->ip_off = ntohs(ip->ip_off);
1512 icmp_error(args->m, ICMP_UNREACH, code, 0L, 0);
1513 } else if (offset == 0 && args->f_id.proto == IPPROTO_TCP) {
1514 struct tcphdr *const tcp =
1515 L3HDR(struct tcphdr, mtod(args->m, struct ip *));
1517 if ((tcp->th_flags & TH_RST) == 0) {
1518 send_pkt(&args->f_id, ntohl(tcp->th_seq),
1519 ntohl(tcp->th_ack), tcp->th_flags | TH_RST);
1530 * Given an ip_fw *, lookup_next_rule will return a pointer
1531 * to the next rule, which can be either the jump
1532 * target (for skipto instructions) or the next one in the list (in
1533 * all other cases including a missing jump target).
1534 * The result is also written in the "next_rule" field of the rule.
1535 * Backward jumps are not allowed, so start looking from the next
1538 * This never returns NULL -- in case we do not have an exact match,
1539 * the next rule is returned. When the ruleset is changed,
1540 * pointers are flushed so we are always correct.
1543 static struct ip_fw *
1544 lookup_next_rule(struct ip_fw *me)
1546 struct ip_fw *rule = NULL;
1549 /* look for action, in case it is a skipto */
1550 cmd = ACTION_PTR(me);
1551 if (cmd->opcode == O_LOG)
1553 if (cmd->opcode == O_SKIPTO) {
1554 for (rule = me->next; rule; rule = rule->next) {
1555 if (rule->rulenum >= cmd->arg1)
1559 if (rule == NULL) /* failure or not a skipto */
1561 me->next_rule = rule;
1566 _ipfw_match_uid(const struct ipfw_flow_id *fid, struct ifnet *oif,
1567 enum ipfw_opcodes opcode, uid_t uid)
1569 struct in_addr src_ip, dst_ip;
1570 struct inpcbinfo *pi;
1574 if (fid->proto == IPPROTO_TCP) {
1576 pi = &tcbinfo[mycpuid];
1577 } else if (fid->proto == IPPROTO_UDP) {
1585 * Values in 'fid' are in host byte order
1587 dst_ip.s_addr = htonl(fid->dst_ip);
1588 src_ip.s_addr = htonl(fid->src_ip);
1590 pcb = in_pcblookup_hash(pi,
1591 dst_ip, htons(fid->dst_port),
1592 src_ip, htons(fid->src_port),
1595 pcb = in_pcblookup_hash(pi,
1596 src_ip, htons(fid->src_port),
1597 dst_ip, htons(fid->dst_port),
1600 if (pcb == NULL || pcb->inp_socket == NULL)
1603 if (opcode == O_UID) {
1604 #define socheckuid(a,b) ((a)->so_cred->cr_uid != (b))
1605 return !socheckuid(pcb->inp_socket, uid);
1608 return groupmember(uid, pcb->inp_socket->so_cred);
1613 ipfw_match_uid(const struct ipfw_flow_id *fid, struct ifnet *oif,
1614 enum ipfw_opcodes opcode, uid_t uid, int *deny)
1616 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
1621 gen = ctx->ipfw_gen;
1624 if (gen != ctx->ipfw_gen) {
1625 /* See the comment in lookup_rule() */
1628 match = _ipfw_match_uid(fid, oif, opcode, uid);
1635 * The main check routine for the firewall.
1637 * All arguments are in args so we can modify them and return them
1638 * back to the caller.
1642 * args->m (in/out) The packet; we set to NULL when/if we nuke it.
1643 * Starts with the IP header.
1644 * args->eh (in) Mac header if present, or NULL for layer3 packet.
1645 * args->oif Outgoing interface, or NULL if packet is incoming.
1646 * The incoming interface is in the mbuf. (in)
1648 * args->rule Pointer to the last matching rule (in/out)
1649 * args->f_id Addresses grabbed from the packet (out)
1653 * If the packet was denied/rejected and has been dropped, *m is equal
1654 * to NULL upon return.
1656 * IP_FW_DENY the packet must be dropped.
1657 * IP_FW_PASS The packet is to be accepted and routed normally.
1658 * IP_FW_DIVERT Divert the packet to port (args->cookie)
1659 * IP_FW_TEE Tee the packet to port (args->cookie)
1660 * IP_FW_DUMMYNET Send the packet to pipe/queue (args->cookie)
1664 ipfw_chk(struct ip_fw_args *args)
1667 * Local variables hold state during the processing of a packet.
1669 * IMPORTANT NOTE: to speed up the processing of rules, there
1670 * are some assumption on the values of the variables, which
1671 * are documented here. Should you change them, please check
1672 * the implementation of the various instructions to make sure
1673 * that they still work.
1675 * args->eh The MAC header. It is non-null for a layer2
1676 * packet, it is NULL for a layer-3 packet.
1678 * m | args->m Pointer to the mbuf, as received from the caller.
1679 * It may change if ipfw_chk() does an m_pullup, or if it
1680 * consumes the packet because it calls send_reject().
1681 * XXX This has to change, so that ipfw_chk() never modifies
1682 * or consumes the buffer.
1683 * ip is simply an alias of the value of m, and it is kept
1684 * in sync with it (the packet is supposed to start with
1687 struct mbuf *m = args->m;
1688 struct ip *ip = mtod(m, struct ip *);
1691 * oif | args->oif If NULL, ipfw_chk has been called on the
1692 * inbound path (ether_input, ip_input).
1693 * If non-NULL, ipfw_chk has been called on the outbound path
1694 * (ether_output, ip_output).
1696 struct ifnet *oif = args->oif;
1698 struct ip_fw *f = NULL; /* matching rule */
1699 int retval = IP_FW_PASS;
1701 struct divert_info *divinfo;
1704 * hlen The length of the IPv4 header.
1705 * hlen >0 means we have an IPv4 packet.
1707 u_int hlen = 0; /* hlen >0 means we have an IP pkt */
1710 * offset The offset of a fragment. offset != 0 means that
1711 * we have a fragment at this offset of an IPv4 packet.
1712 * offset == 0 means that (if this is an IPv4 packet)
1713 * this is the first or only fragment.
1718 * Local copies of addresses. They are only valid if we have
1721 * proto The protocol. Set to 0 for non-ip packets,
1722 * or to the protocol read from the packet otherwise.
1723 * proto != 0 means that we have an IPv4 packet.
1725 * src_port, dst_port port numbers, in HOST format. Only
1726 * valid for TCP and UDP packets.
1728 * src_ip, dst_ip ip addresses, in NETWORK format.
1729 * Only valid for IPv4 packets.
1732 uint16_t src_port = 0, dst_port = 0; /* NOTE: host format */
1733 struct in_addr src_ip, dst_ip; /* NOTE: network format */
1734 uint16_t ip_len = 0;
1737 * dyn_dir = MATCH_UNKNOWN when rules unchecked,
1738 * MATCH_NONE when checked and not matched (dyn_f = NULL),
1739 * MATCH_FORWARD or MATCH_REVERSE otherwise (dyn_f != NULL)
1741 int dyn_dir = MATCH_UNKNOWN;
1742 struct ip_fw *dyn_f = NULL;
1743 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
1745 if (m->m_pkthdr.fw_flags & IPFW_MBUF_GENERATED)
1746 return IP_FW_PASS; /* accept */
1748 if (args->eh == NULL || /* layer 3 packet */
1749 (m->m_pkthdr.len >= sizeof(struct ip) &&
1750 ntohs(args->eh->ether_type) == ETHERTYPE_IP))
1751 hlen = ip->ip_hl << 2;
1754 * Collect parameters into local variables for faster matching.
1756 if (hlen == 0) { /* do not grab addresses for non-ip pkts */
1757 proto = args->f_id.proto = 0; /* mark f_id invalid */
1758 goto after_ip_checks;
1761 proto = args->f_id.proto = ip->ip_p;
1762 src_ip = ip->ip_src;
1763 dst_ip = ip->ip_dst;
1764 if (args->eh != NULL) { /* layer 2 packets are as on the wire */
1765 offset = ntohs(ip->ip_off) & IP_OFFMASK;
1766 ip_len = ntohs(ip->ip_len);
1768 offset = ip->ip_off & IP_OFFMASK;
1769 ip_len = ip->ip_len;
1772 #define PULLUP_TO(len) \
1774 if (m->m_len < (len)) { \
1775 args->m = m = m_pullup(m, (len));\
1777 goto pullup_failed; \
1778 ip = mtod(m, struct ip *); \
1788 PULLUP_TO(hlen + sizeof(struct tcphdr));
1789 tcp = L3HDR(struct tcphdr, ip);
1790 dst_port = tcp->th_dport;
1791 src_port = tcp->th_sport;
1792 args->f_id.flags = tcp->th_flags;
1800 PULLUP_TO(hlen + sizeof(struct udphdr));
1801 udp = L3HDR(struct udphdr, ip);
1802 dst_port = udp->uh_dport;
1803 src_port = udp->uh_sport;
1808 PULLUP_TO(hlen + 4); /* type, code and checksum. */
1809 args->f_id.flags = L3HDR(struct icmp, ip)->icmp_type;
1819 args->f_id.src_ip = ntohl(src_ip.s_addr);
1820 args->f_id.dst_ip = ntohl(dst_ip.s_addr);
1821 args->f_id.src_port = src_port = ntohs(src_port);
1822 args->f_id.dst_port = dst_port = ntohs(dst_port);
1827 * Packet has already been tagged. Look for the next rule
1828 * to restart processing.
1830 * If fw_one_pass != 0 then just accept it.
1831 * XXX should not happen here, but optimized out in
1837 /* This rule is being/has been flushed */
1841 KASSERT(args->rule->cpuid == mycpuid,
1842 ("rule used on cpu%d\n", mycpuid));
1844 /* This rule was deleted */
1845 if (args->rule->rule_flags & IPFW_RULE_F_INVALID)
1848 f = args->rule->next_rule;
1850 f = lookup_next_rule(args->rule);
1853 * Find the starting rule. It can be either the first
1854 * one, or the one after divert_rule if asked so.
1858 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL);
1860 divinfo = m_tag_data(mtag);
1861 skipto = divinfo->skipto;
1866 f = ctx->ipfw_layer3_chain;
1867 if (args->eh == NULL && skipto != 0) {
1868 /* No skipto during rule flushing */
1872 if (skipto >= IPFW_DEFAULT_RULE)
1873 return IP_FW_DENY; /* invalid */
1875 while (f && f->rulenum <= skipto)
1877 if (f == NULL) /* drop packet */
1879 } else if (ipfw_flushing) {
1880 /* Rules are being flushed; skip to default rule */
1881 f = ctx->ipfw_default_rule;
1884 if ((mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL)
1885 m_tag_delete(m, mtag);
1888 * Now scan the rules, and parse microinstructions for each rule.
1890 for (; f; f = f->next) {
1893 int skip_or; /* skip rest of OR block */
1896 if (ctx->ipfw_set_disable & (1 << f->set))
1900 for (l = f->cmd_len, cmd = f->cmd; l > 0;
1901 l -= cmdlen, cmd += cmdlen) {
1905 * check_body is a jump target used when we find a
1906 * CHECK_STATE, and need to jump to the body of
1911 cmdlen = F_LEN(cmd);
1913 * An OR block (insn_1 || .. || insn_n) has the
1914 * F_OR bit set in all but the last instruction.
1915 * The first match will set "skip_or", and cause
1916 * the following instructions to be skipped until
1917 * past the one with the F_OR bit clear.
1919 if (skip_or) { /* skip this instruction */
1920 if ((cmd->len & F_OR) == 0)
1921 skip_or = 0; /* next one is good */
1924 match = 0; /* set to 1 if we succeed */
1926 switch (cmd->opcode) {
1928 * The first set of opcodes compares the packet's
1929 * fields with some pattern, setting 'match' if a
1930 * match is found. At the end of the loop there is
1931 * logic to deal with F_NOT and F_OR flags associated
1939 kprintf("ipfw: opcode %d unimplemented\n",
1946 * We only check offset == 0 && proto != 0,
1947 * as this ensures that we have an IPv4
1948 * packet with the ports info.
1953 match = ipfw_match_uid(&args->f_id, oif,
1955 (uid_t)((ipfw_insn_u32 *)cmd)->d[0],
1962 match = iface_match(m->m_pkthdr.rcvif,
1963 (ipfw_insn_if *)cmd);
1967 match = iface_match(oif, (ipfw_insn_if *)cmd);
1971 match = iface_match(oif ? oif :
1972 m->m_pkthdr.rcvif, (ipfw_insn_if *)cmd);
1976 if (args->eh != NULL) { /* have MAC header */
1977 uint32_t *want = (uint32_t *)
1978 ((ipfw_insn_mac *)cmd)->addr;
1979 uint32_t *mask = (uint32_t *)
1980 ((ipfw_insn_mac *)cmd)->mask;
1981 uint32_t *hdr = (uint32_t *)args->eh;
1984 (want[0] == (hdr[0] & mask[0]) &&
1985 want[1] == (hdr[1] & mask[1]) &&
1986 want[2] == (hdr[2] & mask[2]));
1991 if (args->eh != NULL) {
1993 ntohs(args->eh->ether_type);
1995 ((ipfw_insn_u16 *)cmd)->ports;
1998 /* Special vlan handling */
1999 if (m->m_flags & M_VLANTAG)
2002 for (i = cmdlen - 1; !match && i > 0;
2005 (t >= p[0] && t <= p[1]);
2011 match = (hlen > 0 && offset != 0);
2014 case O_IN: /* "out" is "not in" */
2015 match = (oif == NULL);
2019 match = (args->eh != NULL);
2024 * We do not allow an arg of 0 so the
2025 * check of "proto" only suffices.
2027 match = (proto == cmd->arg1);
2031 match = (hlen > 0 &&
2032 ((ipfw_insn_ip *)cmd)->addr.s_addr ==
2037 match = (hlen > 0 &&
2038 ((ipfw_insn_ip *)cmd)->addr.s_addr ==
2040 ((ipfw_insn_ip *)cmd)->mask.s_addr));
2047 tif = INADDR_TO_IFP(&src_ip);
2048 match = (tif != NULL);
2055 uint32_t *d = (uint32_t *)(cmd + 1);
2057 cmd->opcode == O_IP_DST_SET ?
2063 addr -= d[0]; /* subtract base */
2065 (addr < cmd->arg1) &&
2066 (d[1 + (addr >> 5)] &
2067 (1 << (addr & 0x1f)));
2072 match = (hlen > 0 &&
2073 ((ipfw_insn_ip *)cmd)->addr.s_addr ==
2078 match = (hlen > 0) &&
2079 (((ipfw_insn_ip *)cmd)->addr.s_addr ==
2081 ((ipfw_insn_ip *)cmd)->mask.s_addr));
2088 tif = INADDR_TO_IFP(&dst_ip);
2089 match = (tif != NULL);
2096 * offset == 0 && proto != 0 is enough
2097 * to guarantee that we have an IPv4
2098 * packet with port info.
2100 if ((proto==IPPROTO_UDP || proto==IPPROTO_TCP)
2103 (cmd->opcode == O_IP_SRCPORT) ?
2104 src_port : dst_port ;
2106 ((ipfw_insn_u16 *)cmd)->ports;
2109 for (i = cmdlen - 1; !match && i > 0;
2112 (x >= p[0] && x <= p[1]);
2118 match = (offset == 0 && proto==IPPROTO_ICMP &&
2119 icmptype_match(ip, (ipfw_insn_u32 *)cmd));
2123 match = (hlen > 0 && ipopts_match(ip, cmd));
2127 match = (hlen > 0 && cmd->arg1 == ip->ip_v);
2131 match = (hlen > 0 && cmd->arg1 == ip->ip_ttl);
2135 match = (hlen > 0 &&
2136 cmd->arg1 == ntohs(ip->ip_id));
2140 match = (hlen > 0 && cmd->arg1 == ip_len);
2143 case O_IPPRECEDENCE:
2144 match = (hlen > 0 &&
2145 (cmd->arg1 == (ip->ip_tos & 0xe0)));
2149 match = (hlen > 0 &&
2150 flags_match(cmd, ip->ip_tos));
2154 match = (proto == IPPROTO_TCP && offset == 0 &&
2156 L3HDR(struct tcphdr,ip)->th_flags));
2160 match = (proto == IPPROTO_TCP && offset == 0 &&
2161 tcpopts_match(ip, cmd));
2165 match = (proto == IPPROTO_TCP && offset == 0 &&
2166 ((ipfw_insn_u32 *)cmd)->d[0] ==
2167 L3HDR(struct tcphdr,ip)->th_seq);
2171 match = (proto == IPPROTO_TCP && offset == 0 &&
2172 ((ipfw_insn_u32 *)cmd)->d[0] ==
2173 L3HDR(struct tcphdr,ip)->th_ack);
2177 match = (proto == IPPROTO_TCP && offset == 0 &&
2179 L3HDR(struct tcphdr,ip)->th_win);
2183 /* reject packets which have SYN only */
2184 /* XXX should i also check for TH_ACK ? */
2185 match = (proto == IPPROTO_TCP && offset == 0 &&
2186 (L3HDR(struct tcphdr,ip)->th_flags &
2187 (TH_RST | TH_ACK | TH_SYN)) != TH_SYN);
2192 ipfw_log(f, hlen, args->eh, m, oif);
2197 match = (krandom() <
2198 ((ipfw_insn_u32 *)cmd)->d[0]);
2202 * The second set of opcodes represents 'actions',
2203 * i.e. the terminal part of a rule once the packet
2204 * matches all previous patterns.
2205 * Typically there is only one action for each rule,
2206 * and the opcode is stored at the end of the rule
2207 * (but there are exceptions -- see below).
2209 * In general, here we set retval and terminate the
2210 * outer loop (would be a 'break 3' in some language,
2211 * but we need to do a 'goto done').
2214 * O_COUNT and O_SKIPTO actions:
2215 * instead of terminating, we jump to the next rule
2216 * ('goto next_rule', equivalent to a 'break 2'),
2217 * or to the SKIPTO target ('goto again' after
2218 * having set f, cmd and l), respectively.
2220 * O_LIMIT and O_KEEP_STATE: these opcodes are
2221 * not real 'actions', and are stored right
2222 * before the 'action' part of the rule.
2223 * These opcodes try to install an entry in the
2224 * state tables; if successful, we continue with
2225 * the next opcode (match=1; break;), otherwise
2226 * the packet must be dropped ('goto done' after
2227 * setting retval). If static rules are changed
2228 * during the state installation, the packet will
2229 * be dropped and rule's stats will not beupdated
2230 * ('return IP_FW_DENY').
2232 * O_PROBE_STATE and O_CHECK_STATE: these opcodes
2233 * cause a lookup of the state table, and a jump
2234 * to the 'action' part of the parent rule
2235 * ('goto check_body') if an entry is found, or
2236 * (CHECK_STATE only) a jump to the next rule if
2237 * the entry is not found ('goto next_rule').
2238 * The result of the lookup is cached to make
2239 * further instances of these opcodes are
2240 * effectively NOPs. If static rules are changed
2241 * during the state looking up, the packet will
2242 * be dropped and rule's stats will not be updated
2243 * ('return IP_FW_DENY').
2247 if (!(f->rule_flags & IPFW_RULE_F_STATE)) {
2248 kprintf("%s rule (%d) is not ready "
2250 cmd->opcode == O_LIMIT ?
2251 "limit" : "keep state",
2252 f->rulenum, f->cpuid);
2255 if (install_state(f,
2256 (ipfw_insn_limit *)cmd, args, &deny)) {
2260 retval = IP_FW_DENY;
2261 goto done; /* error/limit violation */
2271 * dynamic rules are checked at the first
2272 * keep-state or check-state occurrence,
2273 * with the result being stored in dyn_dir.
2274 * The compiler introduces a PROBE_STATE
2275 * instruction for us when we have a
2276 * KEEP_STATE (because PROBE_STATE needs
2279 if (dyn_dir == MATCH_UNKNOWN) {
2280 dyn_f = lookup_rule(&args->f_id,
2282 proto == IPPROTO_TCP ?
2283 L3HDR(struct tcphdr, ip) : NULL,
2287 if (dyn_f != NULL) {
2289 * Found a rule from a dynamic
2290 * entry; jump to the 'action'
2294 cmd = ACTION_PTR(f);
2295 l = f->cmd_len - f->act_ofs;
2300 * Dynamic entry not found. If CHECK_STATE,
2301 * skip to next rule, if PROBE_STATE just
2302 * ignore and continue with next opcode.
2304 if (cmd->opcode == O_CHECK_STATE)
2306 else if (!(f->rule_flags & IPFW_RULE_F_STATE))
2307 goto next_rule; /* not ready yet */
2312 retval = IP_FW_PASS; /* accept */
2317 args->rule = f; /* report matching rule */
2318 args->cookie = cmd->arg1;
2319 retval = IP_FW_DUMMYNET;
2324 if (args->eh) /* not on layer 2 */
2327 mtag = m_tag_get(PACKET_TAG_IPFW_DIVERT,
2328 sizeof(*divinfo), MB_DONTWAIT);
2330 retval = IP_FW_DENY;
2333 divinfo = m_tag_data(mtag);
2335 divinfo->skipto = f->rulenum;
2336 divinfo->port = cmd->arg1;
2337 divinfo->tee = (cmd->opcode == O_TEE);
2338 m_tag_prepend(m, mtag);
2340 args->cookie = cmd->arg1;
2341 retval = (cmd->opcode == O_DIVERT) ?
2342 IP_FW_DIVERT : IP_FW_TEE;
2347 f->pcnt++; /* update stats */
2349 f->timestamp = time_second;
2350 if (cmd->opcode == O_COUNT)
2353 if (f->next_rule == NULL)
2354 lookup_next_rule(f);
2360 * Drop the packet and send a reject notice
2361 * if the packet is not ICMP (or is an ICMP
2362 * query), and it is not multicast/broadcast.
2365 (proto != IPPROTO_ICMP ||
2366 is_icmp_query(ip)) &&
2367 !(m->m_flags & (M_BCAST|M_MCAST)) &&
2368 !IN_MULTICAST(ntohl(dst_ip.s_addr))) {
2370 * Update statistics before the possible
2371 * blocking 'send_reject'
2375 f->timestamp = time_second;
2377 send_reject(args, cmd->arg1,
2382 * Return directly here, rule stats
2383 * have been updated above.
2389 retval = IP_FW_DENY;
2393 if (args->eh) /* not valid on layer2 pkts */
2395 if (!dyn_f || dyn_dir == MATCH_FORWARD) {
2396 struct sockaddr_in *sin;
2398 mtag = m_tag_get(PACKET_TAG_IPFORWARD,
2399 sizeof(*sin), MB_DONTWAIT);
2401 retval = IP_FW_DENY;
2404 sin = m_tag_data(mtag);
2406 /* Structure copy */
2407 *sin = ((ipfw_insn_sa *)cmd)->sa;
2409 m_tag_prepend(m, mtag);
2410 m->m_pkthdr.fw_flags |=
2411 IPFORWARD_MBUF_TAGGED;
2413 retval = IP_FW_PASS;
2417 panic("-- unknown opcode %d\n", cmd->opcode);
2418 } /* end of switch() on opcodes */
2420 if (cmd->len & F_NOT)
2424 if (cmd->len & F_OR)
2427 if (!(cmd->len & F_OR)) /* not an OR block, */
2428 break; /* try next rule */
2431 } /* end of inner for, scan opcodes */
2433 next_rule:; /* try next rule */
2435 } /* end of outer for, scan rules */
2436 kprintf("+++ ipfw: ouch!, skip past end of rules, denying packet\n");
2440 /* Update statistics */
2443 f->timestamp = time_second;
2448 kprintf("pullup failed\n");
2453 ipfw_dummynet_io(struct mbuf *m, int pipe_nr, int dir, struct ip_fw_args *fwa)
2458 const struct ipfw_flow_id *id;
2459 struct dn_flow_id *fid;
2463 mtag = m_tag_get(PACKET_TAG_DUMMYNET, sizeof(*pkt), MB_DONTWAIT);
2468 m_tag_prepend(m, mtag);
2470 pkt = m_tag_data(mtag);
2471 bzero(pkt, sizeof(*pkt));
2473 cmd = fwa->rule->cmd + fwa->rule->act_ofs;
2474 if (cmd->opcode == O_LOG)
2476 KASSERT(cmd->opcode == O_PIPE || cmd->opcode == O_QUEUE,
2477 ("Rule is not PIPE or QUEUE, opcode %d\n", cmd->opcode));
2480 pkt->dn_flags = (dir & DN_FLAGS_DIR_MASK);
2481 pkt->ifp = fwa->oif;
2482 pkt->pipe_nr = pipe_nr;
2484 pkt->cpuid = mycpuid;
2485 if (curthread->td_flags & TDF_NETWORK) {
2486 pkt->msgport = &curthread->td_msgport;
2489 * This could happen:
2490 * - If a gratuitous arp request sent by us is going to
2491 * be added to dummynet(4) pipe/queue.
2492 * - Other conditions ...
2494 * We can't use current thread's msgport (since its
2495 * behaviour is unknown), so netisrX's msgport is used.
2497 pkt->msgport = cpu_portfn(pkt->cpuid);
2502 fid->fid_dst_ip = id->dst_ip;
2503 fid->fid_src_ip = id->src_ip;
2504 fid->fid_dst_port = id->dst_port;
2505 fid->fid_src_port = id->src_port;
2506 fid->fid_proto = id->proto;
2507 fid->fid_flags = id->flags;
2509 ipfw_ref_rule(fwa->rule);
2510 pkt->dn_priv = fwa->rule;
2511 pkt->dn_unref_priv = ipfw_unref_rule;
2513 if (cmd->opcode == O_PIPE)
2514 pkt->dn_flags |= DN_FLAGS_IS_PIPE;
2516 m->m_pkthdr.fw_flags |= DUMMYNET_MBUF_TAGGED;
2520 * When a rule is added/deleted, clear the next_rule pointers in all rules.
2521 * These will be reconstructed on the fly as packets are matched.
2522 * Must be called at splimp().
2525 ipfw_flush_rule_ptrs(struct ipfw_context *ctx)
2529 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next)
2530 rule->next_rule = NULL;
2533 static __inline void
2534 ipfw_inc_static_count(struct ip_fw *rule)
2536 /* Static rule's counts are updated only on CPU0 */
2537 KKASSERT(mycpuid == 0);
2540 static_ioc_len += IOC_RULESIZE(rule);
2543 static __inline void
2544 ipfw_dec_static_count(struct ip_fw *rule)
2546 int l = IOC_RULESIZE(rule);
2548 /* Static rule's counts are updated only on CPU0 */
2549 KKASSERT(mycpuid == 0);
2551 KASSERT(static_count > 0, ("invalid static count %u\n", static_count));
2554 KASSERT(static_ioc_len >= l,
2555 ("invalid static len %u\n", static_ioc_len));
2556 static_ioc_len -= l;
2560 ipfw_link_sibling(struct netmsg_ipfw *fwmsg, struct ip_fw *rule)
2562 if (fwmsg->sibling != NULL) {
2563 KKASSERT(mycpuid > 0 && fwmsg->sibling->cpuid == mycpuid - 1);
2564 fwmsg->sibling->sibling = rule;
2566 fwmsg->sibling = rule;
2569 static struct ip_fw *
2570 ipfw_create_rule(const struct ipfw_ioc_rule *ioc_rule, struct ip_fw_stub *stub)
2574 rule = kmalloc(RULESIZE(ioc_rule), M_IPFW, M_WAITOK | M_ZERO);
2576 rule->act_ofs = ioc_rule->act_ofs;
2577 rule->cmd_len = ioc_rule->cmd_len;
2578 rule->rulenum = ioc_rule->rulenum;
2579 rule->set = ioc_rule->set;
2580 rule->usr_flags = ioc_rule->usr_flags;
2582 bcopy(ioc_rule->cmd, rule->cmd, rule->cmd_len * 4 /* XXX */);
2585 rule->cpuid = mycpuid;
2589 stub->rule[mycpuid] = rule;
2595 ipfw_add_rule_dispatch(struct netmsg *nmsg)
2597 struct netmsg_ipfw *fwmsg = (struct netmsg_ipfw *)nmsg;
2598 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2601 rule = ipfw_create_rule(fwmsg->ioc_rule, fwmsg->stub);
2604 * Bump generation after ipfw_create_rule(),
2605 * since this function is blocking
2610 * Insert rule into the pre-determined position
2612 if (fwmsg->prev_rule != NULL) {
2613 struct ip_fw *prev, *next;
2615 prev = fwmsg->prev_rule;
2616 KKASSERT(prev->cpuid == mycpuid);
2618 next = fwmsg->next_rule;
2619 KKASSERT(next->cpuid == mycpuid);
2625 * Move to the position on the next CPU
2626 * before the msg is forwarded.
2628 fwmsg->prev_rule = prev->sibling;
2629 fwmsg->next_rule = next->sibling;
2631 KKASSERT(fwmsg->next_rule == NULL);
2632 rule->next = ctx->ipfw_layer3_chain;
2633 ctx->ipfw_layer3_chain = rule;
2636 /* Link rule CPU sibling */
2637 ipfw_link_sibling(fwmsg, rule);
2639 ipfw_flush_rule_ptrs(ctx);
2642 /* Statistics only need to be updated once */
2643 ipfw_inc_static_count(rule);
2645 /* Return the rule on CPU0 */
2646 nmsg->nm_lmsg.u.ms_resultp = rule;
2649 ifnet_forwardmsg(&nmsg->nm_lmsg, mycpuid + 1);
2653 ipfw_enable_state_dispatch(struct netmsg *nmsg)
2655 struct lwkt_msg *lmsg = &nmsg->nm_lmsg;
2656 struct ip_fw *rule = lmsg->u.ms_resultp;
2657 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2661 KKASSERT(rule->cpuid == mycpuid);
2662 KKASSERT(rule->stub != NULL && rule->stub->rule[mycpuid] == rule);
2663 KKASSERT(!(rule->rule_flags & IPFW_RULE_F_STATE));
2664 rule->rule_flags |= IPFW_RULE_F_STATE;
2665 lmsg->u.ms_resultp = rule->sibling;
2667 ifnet_forwardmsg(lmsg, mycpuid + 1);
2671 * Add a new rule to the list. Copy the rule into a malloc'ed area,
2672 * then possibly create a rule number and add the rule to the list.
2673 * Update the rule_number in the input struct so the caller knows
2677 ipfw_add_rule(struct ipfw_ioc_rule *ioc_rule, uint32_t rule_flags)
2679 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2680 struct netmsg_ipfw fwmsg;
2681 struct netmsg *nmsg;
2682 struct ip_fw *f, *prev, *rule;
2683 struct ip_fw_stub *stub;
2685 IPFW_ASSERT_CFGPORT(&curthread->td_msgport);
2688 * If rulenum is 0, find highest numbered rule before the
2689 * default rule, and add rule number incremental step.
2691 if (ioc_rule->rulenum == 0) {
2692 int step = autoinc_step;
2694 KKASSERT(step >= IPFW_AUTOINC_STEP_MIN &&
2695 step <= IPFW_AUTOINC_STEP_MAX);
2698 * Locate the highest numbered rule before default
2700 for (f = ctx->ipfw_layer3_chain; f; f = f->next) {
2701 if (f->rulenum == IPFW_DEFAULT_RULE)
2703 ioc_rule->rulenum = f->rulenum;
2705 if (ioc_rule->rulenum < IPFW_DEFAULT_RULE - step)
2706 ioc_rule->rulenum += step;
2708 KASSERT(ioc_rule->rulenum != IPFW_DEFAULT_RULE &&
2709 ioc_rule->rulenum != 0,
2710 ("invalid rule num %d\n", ioc_rule->rulenum));
2713 * Now find the right place for the new rule in the sorted list.
2715 for (prev = NULL, f = ctx->ipfw_layer3_chain; f;
2716 prev = f, f = f->next) {
2717 if (f->rulenum > ioc_rule->rulenum) {
2718 /* Found the location */
2722 KASSERT(f != NULL, ("no default rule?!\n"));
2724 if (rule_flags & IPFW_RULE_F_STATE) {
2728 * If the new rule will create states, then allocate
2729 * a rule stub, which will be referenced by states
2732 size = sizeof(*stub) + ((ncpus - 1) * sizeof(struct ip_fw *));
2733 stub = kmalloc(size, M_IPFW, M_WAITOK | M_ZERO);
2739 * Duplicate the rule onto each CPU.
2740 * The rule duplicated on CPU0 will be returned.
2742 bzero(&fwmsg, sizeof(fwmsg));
2744 netmsg_init(nmsg, &curthread->td_msgport, 0, ipfw_add_rule_dispatch);
2745 fwmsg.ioc_rule = ioc_rule;
2746 fwmsg.prev_rule = prev;
2747 fwmsg.next_rule = prev == NULL ? NULL : f;
2750 ifnet_domsg(&nmsg->nm_lmsg, 0);
2751 KKASSERT(fwmsg.prev_rule == NULL && fwmsg.next_rule == NULL);
2753 rule = nmsg->nm_lmsg.u.ms_resultp;
2754 KKASSERT(rule != NULL && rule->cpuid == mycpuid);
2756 if (rule_flags & IPFW_RULE_F_STATE) {
2758 * Turn on state flag, _after_ everything on all
2759 * CPUs have been setup.
2761 bzero(nmsg, sizeof(*nmsg));
2762 netmsg_init(nmsg, &curthread->td_msgport, 0,
2763 ipfw_enable_state_dispatch);
2764 nmsg->nm_lmsg.u.ms_resultp = rule;
2766 ifnet_domsg(&nmsg->nm_lmsg, 0);
2767 KKASSERT(nmsg->nm_lmsg.u.ms_resultp == NULL);
2770 DPRINTF("++ installed rule %d, static count now %d\n",
2771 rule->rulenum, static_count);
2775 * Free storage associated with a static rule (including derived
2777 * The caller is in charge of clearing rule pointers to avoid
2778 * dangling pointers.
2779 * @return a pointer to the next entry.
2780 * Arguments are not checked, so they better be correct.
2781 * Must be called at splimp().
2783 static struct ip_fw *
2784 ipfw_delete_rule(struct ipfw_context *ctx,
2785 struct ip_fw *prev, struct ip_fw *rule)
2788 struct ip_fw_stub *stub;
2792 /* STATE flag should have been cleared before we reach here */
2793 KKASSERT((rule->rule_flags & IPFW_RULE_F_STATE) == 0);
2798 ctx->ipfw_layer3_chain = n;
2802 /* Mark the rule as invalid */
2803 rule->rule_flags |= IPFW_RULE_F_INVALID;
2804 rule->next_rule = NULL;
2805 rule->sibling = NULL;
2808 /* Don't reset cpuid here; keep various assertion working */
2812 /* Statistics only need to be updated once */
2814 ipfw_dec_static_count(rule);
2816 /* Free 'stub' on the last CPU */
2817 if (stub != NULL && mycpuid == ncpus - 1)
2818 kfree(stub, M_IPFW);
2820 /* Try to free this rule */
2821 ipfw_free_rule(rule);
2823 /* Return the next rule */
2828 ipfw_flush_dispatch(struct netmsg *nmsg)
2830 struct lwkt_msg *lmsg = &nmsg->nm_lmsg;
2831 int kill_default = lmsg->u.ms_result;
2832 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2835 ipfw_flush_rule_ptrs(ctx); /* more efficient to do outside the loop */
2837 while ((rule = ctx->ipfw_layer3_chain) != NULL &&
2838 (kill_default || rule->rulenum != IPFW_DEFAULT_RULE))
2839 ipfw_delete_rule(ctx, NULL, rule);
2841 ifnet_forwardmsg(lmsg, mycpuid + 1);
2845 ipfw_disable_rule_state_dispatch(struct netmsg *nmsg)
2847 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
2848 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2853 rule = dmsg->start_rule;
2855 KKASSERT(rule->cpuid == mycpuid);
2858 * Move to the position on the next CPU
2859 * before the msg is forwarded.
2861 dmsg->start_rule = rule->sibling;
2863 KKASSERT(dmsg->rulenum == 0);
2864 rule = ctx->ipfw_layer3_chain;
2867 while (rule != NULL) {
2868 if (dmsg->rulenum && rule->rulenum != dmsg->rulenum)
2870 rule->rule_flags &= ~IPFW_RULE_F_STATE;
2874 ifnet_forwardmsg(&nmsg->nm_lmsg, mycpuid + 1);
2878 * Deletes all rules from a chain (including the default rule
2879 * if the second argument is set).
2880 * Must be called at splimp().
2883 ipfw_flush(int kill_default)
2885 struct netmsg_del dmsg;
2887 struct lwkt_msg *lmsg;
2889 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2891 IPFW_ASSERT_CFGPORT(&curthread->td_msgport);
2894 * If 'kill_default' then caller has done the necessary
2895 * msgport syncing; unnecessary to do it again.
2897 if (!kill_default) {
2899 * Let ipfw_chk() know the rules are going to
2900 * be flushed, so it could jump directly to
2904 netmsg_service_sync();
2908 * Clear STATE flag on rules, so no more states (dyn rules)
2911 bzero(&dmsg, sizeof(dmsg));
2912 netmsg_init(&dmsg.nmsg, &curthread->td_msgport, 0,
2913 ipfw_disable_rule_state_dispatch);
2914 ifnet_domsg(&dmsg.nmsg.nm_lmsg, 0);
2917 * This actually nukes all states (dyn rules)
2919 lockmgr(&dyn_lock, LK_EXCLUSIVE);
2920 for (rule = ctx->ipfw_layer3_chain; rule != NULL; rule = rule->next) {
2922 * Can't check IPFW_RULE_F_STATE here,
2923 * since it has been cleared previously.
2924 * Check 'stub' instead.
2926 if (rule->stub != NULL) {
2928 remove_dyn_rule_locked(rule, NULL);
2931 lockmgr(&dyn_lock, LK_RELEASE);
2934 * Press the 'flush' button
2936 bzero(&nmsg, sizeof(nmsg));
2937 netmsg_init(&nmsg, &curthread->td_msgport, 0, ipfw_flush_dispatch);
2938 lmsg = &nmsg.nm_lmsg;
2939 lmsg->u.ms_result = kill_default;
2940 ifnet_domsg(lmsg, 0);
2942 KASSERT(dyn_count == 0, ("%u dyn rule remains\n", dyn_count));
2945 if (ipfw_dyn_v != NULL) {
2947 * Free dynamic rules(state) hash table
2949 kfree(ipfw_dyn_v, M_IPFW);
2953 KASSERT(static_count == 0,
2954 ("%u static rules remains\n", static_count));
2955 KASSERT(static_ioc_len == 0,
2956 ("%u bytes of static rules remains\n", static_ioc_len));
2958 KASSERT(static_count == 1,
2959 ("%u static rules remains\n", static_count));
2960 KASSERT(static_ioc_len == IOC_RULESIZE(ctx->ipfw_default_rule),
2961 ("%u bytes of static rules remains, should be %u\n",
2962 static_ioc_len, IOC_RULESIZE(ctx->ipfw_default_rule)));
2970 ipfw_alt_delete_rule_dispatch(struct netmsg *nmsg)
2972 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
2973 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
2974 struct ip_fw *rule, *prev;
2976 rule = dmsg->start_rule;
2977 KKASSERT(rule->cpuid == mycpuid);
2978 dmsg->start_rule = rule->sibling;
2980 prev = dmsg->prev_rule;
2982 KKASSERT(prev->cpuid == mycpuid);
2985 * Move to the position on the next CPU
2986 * before the msg is forwarded.
2988 dmsg->prev_rule = prev->sibling;
2992 * flush pointers outside the loop, then delete all matching
2993 * rules. 'prev' remains the same throughout the cycle.
2995 ipfw_flush_rule_ptrs(ctx);
2996 while (rule && rule->rulenum == dmsg->rulenum)
2997 rule = ipfw_delete_rule(ctx, prev, rule);
2999 ifnet_forwardmsg(&nmsg->nm_lmsg, mycpuid + 1);
3003 ipfw_alt_delete_rule(uint16_t rulenum)
3005 struct ip_fw *prev, *rule, *f;
3006 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3007 struct netmsg_del dmsg;
3008 struct netmsg *nmsg;
3012 * Locate first rule to delete
3014 for (prev = NULL, rule = ctx->ipfw_layer3_chain;
3015 rule && rule->rulenum < rulenum;
3016 prev = rule, rule = rule->next)
3018 if (rule->rulenum != rulenum)
3022 * Check whether any rules with the given number will
3026 for (f = rule; f && f->rulenum == rulenum; f = f->next) {
3027 if (f->rule_flags & IPFW_RULE_F_STATE) {
3035 * Clear the STATE flag, so no more states will be
3036 * created based the rules numbered 'rulenum'.
3038 bzero(&dmsg, sizeof(dmsg));
3040 netmsg_init(nmsg, &curthread->td_msgport, 0,
3041 ipfw_disable_rule_state_dispatch);
3042 dmsg.start_rule = rule;
3043 dmsg.rulenum = rulenum;
3045 ifnet_domsg(&nmsg->nm_lmsg, 0);
3046 KKASSERT(dmsg.start_rule == NULL);
3049 * Nuke all related states
3051 lockmgr(&dyn_lock, LK_EXCLUSIVE);
3052 for (f = rule; f && f->rulenum == rulenum; f = f->next) {
3054 * Can't check IPFW_RULE_F_STATE here,
3055 * since it has been cleared previously.
3056 * Check 'stub' instead.
3058 if (f->stub != NULL) {
3060 remove_dyn_rule_locked(f, NULL);
3063 lockmgr(&dyn_lock, LK_RELEASE);
3067 * Get rid of the rule duplications on all CPUs
3069 bzero(&dmsg, sizeof(dmsg));
3071 netmsg_init(nmsg, &curthread->td_msgport, 0,
3072 ipfw_alt_delete_rule_dispatch);
3073 dmsg.prev_rule = prev;
3074 dmsg.start_rule = rule;
3075 dmsg.rulenum = rulenum;
3077 ifnet_domsg(&nmsg->nm_lmsg, 0);
3078 KKASSERT(dmsg.prev_rule == NULL && dmsg.start_rule == NULL);
3083 ipfw_alt_delete_ruleset_dispatch(struct netmsg *nmsg)
3085 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
3086 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3087 struct ip_fw *prev, *rule;
3092 ipfw_flush_rule_ptrs(ctx);
3095 rule = ctx->ipfw_layer3_chain;
3096 while (rule != NULL) {
3097 if (rule->set == dmsg->from_set) {
3098 rule = ipfw_delete_rule(ctx, prev, rule);
3107 KASSERT(del, ("no match set?!\n"));
3109 ifnet_forwardmsg(&nmsg->nm_lmsg, mycpuid + 1);
3113 ipfw_disable_ruleset_state_dispatch(struct netmsg *nmsg)
3115 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
3116 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3124 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next) {
3125 if (rule->set == dmsg->from_set) {
3129 rule->rule_flags &= ~IPFW_RULE_F_STATE;
3132 KASSERT(cleared, ("no match set?!\n"));
3134 ifnet_forwardmsg(&nmsg->nm_lmsg, mycpuid + 1);
3138 ipfw_alt_delete_ruleset(uint8_t set)
3140 struct netmsg_del dmsg;
3141 struct netmsg *nmsg;
3144 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3147 * Check whether the 'set' exists. If it exists,
3148 * then check whether any rules within the set will
3149 * try to create states.
3153 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next) {
3154 if (rule->set == set) {
3156 if (rule->rule_flags & IPFW_RULE_F_STATE) {
3163 return 0; /* XXX EINVAL? */
3167 * Clear the STATE flag, so no more states will be
3168 * created based the rules in this set.
3170 bzero(&dmsg, sizeof(dmsg));
3172 netmsg_init(nmsg, &curthread->td_msgport, 0,
3173 ipfw_disable_ruleset_state_dispatch);
3174 dmsg.from_set = set;
3176 ifnet_domsg(&nmsg->nm_lmsg, 0);
3179 * Nuke all related states
3181 lockmgr(&dyn_lock, LK_EXCLUSIVE);
3182 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next) {
3183 if (rule->set != set)
3187 * Can't check IPFW_RULE_F_STATE here,
3188 * since it has been cleared previously.
3189 * Check 'stub' instead.
3191 if (rule->stub != NULL) {
3193 remove_dyn_rule_locked(rule, NULL);
3196 lockmgr(&dyn_lock, LK_RELEASE);
3202 bzero(&dmsg, sizeof(dmsg));
3204 netmsg_init(nmsg, &curthread->td_msgport, 0,
3205 ipfw_alt_delete_ruleset_dispatch);
3206 dmsg.from_set = set;
3208 ifnet_domsg(&nmsg->nm_lmsg, 0);
3213 ipfw_alt_move_rule_dispatch(struct netmsg *nmsg)
3215 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
3218 rule = dmsg->start_rule;
3219 KKASSERT(rule->cpuid == mycpuid);
3222 * Move to the position on the next CPU
3223 * before the msg is forwarded.
3225 dmsg->start_rule = rule->sibling;
3227 while (rule && rule->rulenum <= dmsg->rulenum) {
3228 if (rule->rulenum == dmsg->rulenum)
3229 rule->set = dmsg->to_set;
3232 ifnet_forwardmsg(&nmsg->nm_lmsg, mycpuid + 1);
3236 ipfw_alt_move_rule(uint16_t rulenum, uint8_t set)
3238 struct netmsg_del dmsg;
3239 struct netmsg *nmsg;
3241 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3244 * Locate first rule to move
3246 for (rule = ctx->ipfw_layer3_chain; rule && rule->rulenum <= rulenum;
3247 rule = rule->next) {
3248 if (rule->rulenum == rulenum && rule->set != set)
3251 if (rule == NULL || rule->rulenum > rulenum)
3252 return 0; /* XXX error? */
3254 bzero(&dmsg, sizeof(dmsg));
3256 netmsg_init(nmsg, &curthread->td_msgport, 0,
3257 ipfw_alt_move_rule_dispatch);
3258 dmsg.start_rule = rule;
3259 dmsg.rulenum = rulenum;
3262 ifnet_domsg(&nmsg->nm_lmsg, 0);
3263 KKASSERT(dmsg.start_rule == NULL);
3268 ipfw_alt_move_ruleset_dispatch(struct netmsg *nmsg)
3270 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
3271 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3274 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next) {
3275 if (rule->set == dmsg->from_set)
3276 rule->set = dmsg->to_set;
3278 ifnet_forwardmsg(&nmsg->nm_lmsg, mycpuid + 1);
3282 ipfw_alt_move_ruleset(uint8_t from_set, uint8_t to_set)
3284 struct netmsg_del dmsg;
3285 struct netmsg *nmsg;
3287 bzero(&dmsg, sizeof(dmsg));
3289 netmsg_init(nmsg, &curthread->td_msgport, 0,
3290 ipfw_alt_move_ruleset_dispatch);
3291 dmsg.from_set = from_set;
3292 dmsg.to_set = to_set;
3294 ifnet_domsg(&nmsg->nm_lmsg, 0);
3299 ipfw_alt_swap_ruleset_dispatch(struct netmsg *nmsg)
3301 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg;
3302 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3305 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next) {
3306 if (rule->set == dmsg->from_set)
3307 rule->set = dmsg->to_set;
3308 else if (rule->set == dmsg->to_set)
3309 rule->set = dmsg->from_set;
3311 ifnet_forwardmsg(&nmsg->nm_lmsg, mycpuid + 1);
3315 ipfw_alt_swap_ruleset(uint8_t set1, uint8_t set2)
3317 struct netmsg_del dmsg;
3318 struct netmsg *nmsg;
3320 bzero(&dmsg, sizeof(dmsg));
3322 netmsg_init(nmsg, &curthread->td_msgport, 0,
3323 ipfw_alt_swap_ruleset_dispatch);
3324 dmsg.from_set = set1;
3327 ifnet_domsg(&nmsg->nm_lmsg, 0);
3332 * Remove all rules with given number, and also do set manipulation.
3334 * The argument is an uint32_t. The low 16 bit are the rule or set number,
3335 * the next 8 bits are the new set, the top 8 bits are the command:
3337 * 0 delete rules with given number
3338 * 1 delete rules with given set number
3339 * 2 move rules with given number to new set
3340 * 3 move rules with given set number to new set
3341 * 4 swap sets with given numbers
3344 ipfw_ctl_alter(uint32_t arg)
3347 uint8_t cmd, new_set;
3350 rulenum = arg & 0xffff;
3351 cmd = (arg >> 24) & 0xff;
3352 new_set = (arg >> 16) & 0xff;
3356 if (new_set >= IPFW_DEFAULT_SET)
3358 if (cmd == 0 || cmd == 2) {
3359 if (rulenum == IPFW_DEFAULT_RULE)
3362 if (rulenum >= IPFW_DEFAULT_SET)
3367 case 0: /* delete rules with given number */
3368 error = ipfw_alt_delete_rule(rulenum);
3371 case 1: /* delete all rules with given set number */
3372 error = ipfw_alt_delete_ruleset(rulenum);
3375 case 2: /* move rules with given number to new set */
3376 error = ipfw_alt_move_rule(rulenum, new_set);
3379 case 3: /* move rules with given set number to new set */
3380 error = ipfw_alt_move_ruleset(rulenum, new_set);
3383 case 4: /* swap two sets */
3384 error = ipfw_alt_swap_ruleset(rulenum, new_set);
3391 * Clear counters for a specific rule.
3394 clear_counters(struct ip_fw *rule, int log_only)
3396 ipfw_insn_log *l = (ipfw_insn_log *)ACTION_PTR(rule);
3398 if (log_only == 0) {
3399 rule->bcnt = rule->pcnt = 0;
3400 rule->timestamp = 0;
3402 if (l->o.opcode == O_LOG)
3403 l->log_left = l->max_log;
3407 ipfw_zero_entry_dispatch(struct netmsg *nmsg)
3409 struct netmsg_zent *zmsg = (struct netmsg_zent *)nmsg;
3410 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3413 if (zmsg->rulenum == 0) {
3414 KKASSERT(zmsg->start_rule == NULL);
3416 ctx->ipfw_norule_counter = 0;
3417 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next)
3418 clear_counters(rule, zmsg->log_only);
3420 struct ip_fw *start = zmsg->start_rule;
3422 KKASSERT(start->cpuid == mycpuid);
3423 KKASSERT(start->rulenum == zmsg->rulenum);
3426 * We can have multiple rules with the same number, so we
3427 * need to clear them all.
3429 for (rule = start; rule && rule->rulenum == zmsg->rulenum;
3431 clear_counters(rule, zmsg->log_only);
3434 * Move to the position on the next CPU
3435 * before the msg is forwarded.
3437 zmsg->start_rule = start->sibling;
3439 ifnet_forwardmsg(&nmsg->nm_lmsg, mycpuid + 1);
3443 * Reset some or all counters on firewall rules.
3444 * @arg frwl is null to clear all entries, or contains a specific
3446 * @arg log_only is 1 if we only want to reset logs, zero otherwise.
3449 ipfw_ctl_zero_entry(int rulenum, int log_only)
3451 struct netmsg_zent zmsg;
3452 struct netmsg *nmsg;
3454 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3456 bzero(&zmsg, sizeof(zmsg));
3458 netmsg_init(nmsg, &curthread->td_msgport, 0, ipfw_zero_entry_dispatch);
3459 zmsg.log_only = log_only;
3462 msg = log_only ? "ipfw: All logging counts reset.\n"
3463 : "ipfw: Accounting cleared.\n";
3468 * Locate the first rule with 'rulenum'
3470 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next) {
3471 if (rule->rulenum == rulenum)
3474 if (rule == NULL) /* we did not find any matching rules */
3476 zmsg.start_rule = rule;
3477 zmsg.rulenum = rulenum;
3479 msg = log_only ? "ipfw: Entry %d logging count reset.\n"
3480 : "ipfw: Entry %d cleared.\n";
3482 ifnet_domsg(&nmsg->nm_lmsg, 0);
3483 KKASSERT(zmsg.start_rule == NULL);
3486 log(LOG_SECURITY | LOG_NOTICE, msg, rulenum);
3491 * Check validity of the structure before insert.
3492 * Fortunately rules are simple, so this mostly need to check rule sizes.
3495 ipfw_check_ioc_rule(struct ipfw_ioc_rule *rule, int size, uint32_t *rule_flags)
3498 int have_action = 0;
3503 /* Check for valid size */
3504 if (size < sizeof(*rule)) {
3505 kprintf("ipfw: rule too short\n");
3508 l = IOC_RULESIZE(rule);
3510 kprintf("ipfw: size mismatch (have %d want %d)\n", size, l);
3514 /* Check rule number */
3515 if (rule->rulenum == IPFW_DEFAULT_RULE) {
3516 kprintf("ipfw: invalid rule number\n");
3521 * Now go for the individual checks. Very simple ones, basically only
3522 * instruction sizes.
3524 for (l = rule->cmd_len, cmd = rule->cmd; l > 0;
3525 l -= cmdlen, cmd += cmdlen) {
3526 cmdlen = F_LEN(cmd);
3528 kprintf("ipfw: opcode %d size truncated\n",
3533 DPRINTF("ipfw: opcode %d\n", cmd->opcode);
3535 if (cmd->opcode == O_KEEP_STATE || cmd->opcode == O_LIMIT) {
3536 /* This rule will create states */
3537 *rule_flags |= IPFW_RULE_F_STATE;
3540 switch (cmd->opcode) {
3554 case O_IPPRECEDENCE:
3561 if (cmdlen != F_INSN_SIZE(ipfw_insn))
3573 if (cmdlen != F_INSN_SIZE(ipfw_insn_u32))
3578 if (cmdlen != F_INSN_SIZE(ipfw_insn_limit))
3583 if (cmdlen != F_INSN_SIZE(ipfw_insn_log))
3586 ((ipfw_insn_log *)cmd)->log_left =
3587 ((ipfw_insn_log *)cmd)->max_log;
3593 if (cmdlen != F_INSN_SIZE(ipfw_insn_ip))
3595 if (((ipfw_insn_ip *)cmd)->mask.s_addr == 0) {
3596 kprintf("ipfw: opcode %d, useless rule\n",
3604 if (cmd->arg1 == 0 || cmd->arg1 > 256) {
3605 kprintf("ipfw: invalid set size %d\n",
3609 if (cmdlen != F_INSN_SIZE(ipfw_insn_u32) +
3615 if (cmdlen != F_INSN_SIZE(ipfw_insn_mac))
3621 case O_IP_DSTPORT: /* XXX artificial limit, 30 port pairs */
3622 if (cmdlen < 2 || cmdlen > 31)
3629 if (cmdlen != F_INSN_SIZE(ipfw_insn_if))
3635 if (cmdlen != F_INSN_SIZE(ipfw_insn_pipe))
3640 if (cmdlen != F_INSN_SIZE(ipfw_insn_sa)) {
3645 fwd_addr = ((ipfw_insn_sa *)cmd)->
3647 if (IN_MULTICAST(ntohl(fwd_addr))) {
3648 kprintf("ipfw: try forwarding to "
3649 "multicast address\n");
3655 case O_FORWARD_MAC: /* XXX not implemented yet */
3664 if (cmdlen != F_INSN_SIZE(ipfw_insn))
3668 kprintf("ipfw: opcode %d, multiple actions"
3675 kprintf("ipfw: opcode %d, action must be"
3682 kprintf("ipfw: opcode %d, unknown opcode\n",
3687 if (have_action == 0) {
3688 kprintf("ipfw: missing action\n");
3694 kprintf("ipfw: opcode %d size %d wrong\n",
3695 cmd->opcode, cmdlen);
3700 ipfw_ctl_add_rule(struct sockopt *sopt)
3702 struct ipfw_ioc_rule *ioc_rule;
3704 uint32_t rule_flags;
3707 size = sopt->sopt_valsize;
3708 if (size > (sizeof(uint32_t) * IPFW_RULE_SIZE_MAX) ||
3709 size < sizeof(*ioc_rule)) {
3712 if (size != (sizeof(uint32_t) * IPFW_RULE_SIZE_MAX)) {
3713 sopt->sopt_val = krealloc(sopt->sopt_val, sizeof(uint32_t) *
3714 IPFW_RULE_SIZE_MAX, M_TEMP, M_WAITOK);
3716 ioc_rule = sopt->sopt_val;
3718 error = ipfw_check_ioc_rule(ioc_rule, size, &rule_flags);
3722 ipfw_add_rule(ioc_rule, rule_flags);
3724 if (sopt->sopt_dir == SOPT_GET)
3725 sopt->sopt_valsize = IOC_RULESIZE(ioc_rule);
3730 ipfw_copy_rule(const struct ip_fw *rule, struct ipfw_ioc_rule *ioc_rule)
3732 const struct ip_fw *sibling;
3737 KKASSERT(rule->cpuid == IPFW_CFGCPUID);
3739 ioc_rule->act_ofs = rule->act_ofs;
3740 ioc_rule->cmd_len = rule->cmd_len;
3741 ioc_rule->rulenum = rule->rulenum;
3742 ioc_rule->set = rule->set;
3743 ioc_rule->usr_flags = rule->usr_flags;
3745 ioc_rule->set_disable = ipfw_ctx[mycpuid]->ipfw_set_disable;
3746 ioc_rule->static_count = static_count;
3747 ioc_rule->static_len = static_ioc_len;
3750 * Visit (read-only) all of the rule's duplications to get
3751 * the necessary statistics
3758 ioc_rule->timestamp = 0;
3759 for (sibling = rule; sibling != NULL; sibling = sibling->sibling) {
3760 ioc_rule->pcnt += sibling->pcnt;
3761 ioc_rule->bcnt += sibling->bcnt;
3762 if (sibling->timestamp > ioc_rule->timestamp)
3763 ioc_rule->timestamp = sibling->timestamp;
3768 KASSERT(i == ncpus, ("static rule is not duplicated on every cpu\n"));
3770 bcopy(rule->cmd, ioc_rule->cmd, ioc_rule->cmd_len * 4 /* XXX */);
3772 return ((uint8_t *)ioc_rule + IOC_RULESIZE(ioc_rule));
3776 ipfw_copy_state(const ipfw_dyn_rule *dyn_rule,
3777 struct ipfw_ioc_state *ioc_state)
3779 const struct ipfw_flow_id *id;
3780 struct ipfw_ioc_flowid *ioc_id;
3782 ioc_state->expire = TIME_LEQ(dyn_rule->expire, time_second) ?
3783 0 : dyn_rule->expire - time_second;
3784 ioc_state->pcnt = dyn_rule->pcnt;
3785 ioc_state->bcnt = dyn_rule->bcnt;
3787 ioc_state->dyn_type = dyn_rule->dyn_type;
3788 ioc_state->count = dyn_rule->count;
3790 ioc_state->rulenum = dyn_rule->stub->rule[mycpuid]->rulenum;
3793 ioc_id = &ioc_state->id;
3795 ioc_id->type = ETHERTYPE_IP;
3796 ioc_id->u.ip.dst_ip = id->dst_ip;
3797 ioc_id->u.ip.src_ip = id->src_ip;
3798 ioc_id->u.ip.dst_port = id->dst_port;
3799 ioc_id->u.ip.src_port = id->src_port;
3800 ioc_id->u.ip.proto = id->proto;
3804 ipfw_ctl_get_rules(struct sockopt *sopt)
3806 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3810 uint32_t dcount = 0;
3813 * pass up a copy of the current rules. Static rules
3814 * come first (the last of which has number IPFW_DEFAULT_RULE),
3815 * followed by a possibly empty list of dynamic rule.
3818 size = static_ioc_len; /* size of static rules */
3819 if (ipfw_dyn_v) { /* add size of dyn.rules */
3821 size += dcount * sizeof(struct ipfw_ioc_state);
3824 if (sopt->sopt_valsize < size) {
3825 /* short length, no need to return incomplete rules */
3826 /* XXX: if superuser, no need to zero buffer */
3827 bzero(sopt->sopt_val, sopt->sopt_valsize);
3830 bp = sopt->sopt_val;
3832 for (rule = ctx->ipfw_layer3_chain; rule; rule = rule->next)
3833 bp = ipfw_copy_rule(rule, bp);
3835 if (ipfw_dyn_v && dcount != 0) {
3836 struct ipfw_ioc_state *ioc_state = bp;
3837 uint32_t dcount2 = 0;
3839 size_t old_size = size;
3843 lockmgr(&dyn_lock, LK_SHARED);
3845 /* Check 'ipfw_dyn_v' again with lock held */
3846 if (ipfw_dyn_v == NULL)
3849 for (i = 0; i < curr_dyn_buckets; i++) {
3853 * The # of dynamic rules may have grown after the
3854 * snapshot of 'dyn_count' was taken, so we will have
3855 * to check 'dcount' (snapshot of dyn_count) here to
3856 * make sure that we don't overflow the pre-allocated
3859 for (p = ipfw_dyn_v[i]; p != NULL && dcount != 0;
3860 p = p->next, ioc_state++, dcount--, dcount2++)
3861 ipfw_copy_state(p, ioc_state);
3864 lockmgr(&dyn_lock, LK_RELEASE);
3867 * The # of dynamic rules may be shrinked after the
3868 * snapshot of 'dyn_count' was taken. To give user a
3869 * correct dynamic rule count, we use the 'dcount2'
3870 * calculated above (with shared lockmgr lock held).
3872 size = static_ioc_len +
3873 (dcount2 * sizeof(struct ipfw_ioc_state));
3874 KKASSERT(size <= old_size);
3877 sopt->sopt_valsize = size;
3882 ipfw_set_disable_dispatch(struct netmsg *nmsg)
3884 struct lwkt_msg *lmsg = &nmsg->nm_lmsg;
3885 struct ipfw_context *ctx = ipfw_ctx[mycpuid];
3888 ctx->ipfw_set_disable = lmsg->u.ms_result32;
3890 ifnet_forwardmsg(lmsg, mycpuid + 1);
3894 ipfw_ctl_set_disable(uint32_t disable, uint32_t enable)
3897 struct lwkt_msg *lmsg;
3898 uint32_t set_disable;
3900 /* IPFW_DEFAULT_SET is always enabled */
3901 enable |= (1 << IPFW_DEFAULT_SET);
3902 set_disable = (ipfw_ctx[mycpuid]->ipfw_set_disable | disable) & ~enable;
3904 bzero(&nmsg, sizeof(nmsg));
3905 netmsg_init(&nmsg, &curthread->td_msgport, 0, ipfw_set_disable_dispatch);
3906 lmsg = &nmsg.nm_lmsg;
3907 lmsg->u.ms_result32 = set_disable;
3909 ifnet_domsg(lmsg, 0);
3913 * {set|get}sockopt parser.
3916 ipfw_ctl(struct sockopt *sopt)
3924 switch (sopt->sopt_name) {
3926 error = ipfw_ctl_get_rules(sopt);
3930 ipfw_flush(0 /* keep default rule */);
3934 error = ipfw_ctl_add_rule(sopt);
3939 * IP_FW_DEL is used for deleting single rules or sets,
3940 * and (ab)used to atomically manipulate sets.
3941 * Argument size is used to distinguish between the two:
3943 * delete single rule or set of rules,
3944 * or reassign rules (or sets) to a different set.
3945 * 2 * sizeof(uint32_t)
3946 * atomic disable/enable sets.
3947 * first uint32_t contains sets to be disabled,
3948 * second uint32_t contains sets to be enabled.
3950 masks = sopt->sopt_val;
3951 size = sopt->sopt_valsize;
3952 if (size == sizeof(*masks)) {
3954 * Delete or reassign static rule
3956 error = ipfw_ctl_alter(masks[0]);
3957 } else if (size == (2 * sizeof(*masks))) {
3959 * Set enable/disable
3961 ipfw_ctl_set_disable(masks[0], masks[1]);
3968 case IP_FW_RESETLOG: /* argument is an int, the rule number */
3971 if (sopt->sopt_val != 0) {
3972 error = soopt_to_kbuf(sopt, &rulenum,
3973 sizeof(int), sizeof(int));
3977 error = ipfw_ctl_zero_entry(rulenum,
3978 sopt->sopt_name == IP_FW_RESETLOG);
3982 kprintf("ipfw_ctl invalid option %d\n", sopt->sopt_name);
3989 * This procedure is only used to handle keepalives. It is invoked
3990 * every dyn_keepalive_period
3993 ipfw_tick_dispatch(struct netmsg *nmsg)
3999 IPFW_ASSERT_CFGPORT(&curthread->td_msgport);
4000 KKASSERT(IPFW_LOADED);
4004 lwkt_replymsg(&nmsg->nm_lmsg, 0);
4007 if (ipfw_dyn_v == NULL || dyn_count == 0)
4010 keep_alive = time_second;
4012 lockmgr(&dyn_lock, LK_EXCLUSIVE);
4014 if (ipfw_dyn_v == NULL || dyn_count == 0) {
4015 lockmgr(&dyn_lock, LK_RELEASE);
4018 gen = dyn_buckets_gen;
4020 for (i = 0; i < curr_dyn_buckets; i++) {
4021 ipfw_dyn_rule *q, *prev;
4023 for (prev = NULL, q = ipfw_dyn_v[i]; q != NULL;) {
4024 uint32_t ack_rev, ack_fwd;
4025 struct ipfw_flow_id id;
4027 if (q->dyn_type == O_LIMIT_PARENT)
4030 if (TIME_LEQ(q->expire, time_second)) {
4032 UNLINK_DYN_RULE(prev, ipfw_dyn_v[i], q);
4037 * Keep alive processing
4042 if (q->id.proto != IPPROTO_TCP)
4044 if ((q->state & BOTH_SYN) != BOTH_SYN)
4046 if (TIME_LEQ(time_second + dyn_keepalive_interval,
4048 goto next; /* too early */
4049 if (q->keep_alive == keep_alive)
4050 goto next; /* alreay done */
4053 * Save necessary information, so that they could
4054 * survive after possible blocking in send_pkt()
4057 ack_rev = q->ack_rev;
4058 ack_fwd = q->ack_fwd;
4060 /* Sending has been started */
4061 q->keep_alive = keep_alive;
4063 /* Release lock to avoid possible dead lock */
4064 lockmgr(&dyn_lock, LK_RELEASE);
4065 send_pkt(&id, ack_rev - 1, ack_fwd, TH_SYN);
4066 send_pkt(&id, ack_fwd - 1, ack_rev, 0);
4067 lockmgr(&dyn_lock, LK_EXCLUSIVE);
4069 if (gen != dyn_buckets_gen) {
4071 * Dyn bucket array has been changed during
4072 * the above two sending; reiterate.
4081 lockmgr(&dyn_lock, LK_RELEASE);
4083 callout_reset(&ipfw_timeout_h, dyn_keepalive_period * hz,
4088 * This procedure is only used to handle keepalives. It is invoked
4089 * every dyn_keepalive_period
4092 ipfw_tick(void *dummy __unused)
4094 struct lwkt_msg *lmsg = &ipfw_timeout_netmsg.nm_lmsg;
4096 KKASSERT(mycpuid == IPFW_CFGCPUID);
4100 KKASSERT(lmsg->ms_flags & MSGF_DONE);
4102 lwkt_sendmsg(IPFW_CFGPORT, lmsg);
4103 /* ipfw_timeout_netmsg's handler reset this callout */
4110 ipfw_check_in(void *arg, struct mbuf **m0, struct ifnet *ifp, int dir)
4112 struct ip_fw_args args;
4113 struct mbuf *m = *m0;
4115 int tee = 0, error = 0, ret;
4117 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
4118 /* Extract info from dummynet tag */
4119 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
4120 KKASSERT(mtag != NULL);
4121 args.rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
4122 KKASSERT(args.rule != NULL);
4124 m_tag_delete(m, mtag);
4125 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED;
4133 ret = ipfw_chk(&args);
4151 case IP_FW_DUMMYNET:
4152 /* Send packet to the appropriate pipe */
4153 ipfw_dummynet_io(m, args.cookie, DN_TO_IP_IN, &args);
4161 if (ip_divert_p != NULL) {
4162 m = ip_divert_p(m, tee, 1);
4166 /* not sure this is the right error msg */
4172 panic("unknown ipfw return value: %d\n", ret);
4180 ipfw_check_out(void *arg, struct mbuf **m0, struct ifnet *ifp, int dir)
4182 struct ip_fw_args args;
4183 struct mbuf *m = *m0;
4185 int tee = 0, error = 0, ret;
4187 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) {
4188 /* Extract info from dummynet tag */
4189 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL);
4190 KKASSERT(mtag != NULL);
4191 args.rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv;
4192 KKASSERT(args.rule != NULL);
4194 m_tag_delete(m, mtag);
4195 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED;
4203 ret = ipfw_chk(&args);
4221 case IP_FW_DUMMYNET:
4222 ipfw_dummynet_io(m, args.cookie, DN_TO_IP_OUT, &args);
4230 if (ip_divert_p != NULL) {
4231 m = ip_divert_p(m, tee, 0);
4235 /* not sure this is the right error msg */
4241 panic("unknown ipfw return value: %d\n", ret);
4251 struct pfil_head *pfh;
4253 IPFW_ASSERT_CFGPORT(&curthread->td_msgport);
4255 pfh = pfil_head_get(PFIL_TYPE_AF, AF_INET);
4259 pfil_add_hook(ipfw_check_in, NULL, PFIL_IN | PFIL_MPSAFE, pfh);
4260 pfil_add_hook(ipfw_check_out, NULL, PFIL_OUT | PFIL_MPSAFE, pfh);
4266 struct pfil_head *pfh;
4268 IPFW_ASSERT_CFGPORT(&curthread->td_msgport);
4270 pfh = pfil_head_get(PFIL_TYPE_AF, AF_INET);
4274 pfil_remove_hook(ipfw_check_in, NULL, PFIL_IN, pfh);
4275 pfil_remove_hook(ipfw_check_out, NULL, PFIL_OUT, pfh);
4279 ipfw_sysctl_enable_dispatch(struct netmsg *nmsg)
4281 struct lwkt_msg *lmsg = &nmsg->nm_lmsg;
4282 int enable = lmsg->u.ms_result;
4284 if (fw_enable == enable)
4293 lwkt_replymsg(lmsg, 0);
4297 ipfw_sysctl_enable(SYSCTL_HANDLER_ARGS)
4300 struct lwkt_msg *lmsg;
4304 error = sysctl_handle_int(oidp, &enable, 0, req);
4305 if (error || req->newptr == NULL)
4308 netmsg_init(&nmsg, &curthread->td_msgport, 0,
4309 ipfw_sysctl_enable_dispatch);
4310 lmsg = &nmsg.nm_lmsg;
4311 lmsg->u.ms_result = enable;
4313 return lwkt_domsg(IPFW_CFGPORT, lmsg, 0);
4317 ipfw_sysctl_autoinc_step(SYSCTL_HANDLER_ARGS)
4319 return sysctl_int_range(oidp, arg1, arg2, req,
4320 IPFW_AUTOINC_STEP_MIN, IPFW_AUTOINC_STEP_MAX);
4324 ipfw_sysctl_dyn_buckets(SYSCTL_HANDLER_ARGS)
4328 lockmgr(&dyn_lock, LK_EXCLUSIVE);
4330 value = dyn_buckets;
4331 error = sysctl_handle_int(oidp, &value, 0, req);
4332 if (error || !req->newptr)
4336 * Make sure we have a power of 2 and
4337 * do not allow more than 64k entries.
4340 if (value <= 1 || value > 65536)
4342 if ((value & (value - 1)) != 0)
4346 dyn_buckets = value;
4348 lockmgr(&dyn_lock, LK_RELEASE);
4353 ipfw_sysctl_dyn_fin(SYSCTL_HANDLER_ARGS)
4355 return sysctl_int_range(oidp, arg1, arg2, req,
4356 1, dyn_keepalive_period - 1);
4360 ipfw_sysctl_dyn_rst(SYSCTL_HANDLER_ARGS)
4362 return sysctl_int_range(oidp, arg1, arg2, req,
4363 1, dyn_keepalive_period - 1);
4367 ipfw_ctx_init_dispatch(struct netmsg *nmsg)
4369 struct netmsg_ipfw *fwmsg = (struct netmsg_ipfw *)nmsg;
4370 struct ipfw_context *ctx;
4371 struct ip_fw *def_rule;
4373 ctx = kmalloc(sizeof(*ctx), M_IPFW, M_WAITOK | M_ZERO);
4374 ipfw_ctx[mycpuid] = ctx;
4376 def_rule = kmalloc(sizeof(*def_rule), M_IPFW, M_WAITOK | M_ZERO);
4378 def_rule->act_ofs = 0;
4379 def_rule->rulenum = IPFW_DEFAULT_RULE;
4380 def_rule->cmd_len = 1;
4381 def_rule->set = IPFW_DEFAULT_SET;
4383 def_rule->cmd[0].len = 1;
4384 #ifdef IPFIREWALL_DEFAULT_TO_ACCEPT
4385 def_rule->cmd[0].opcode = O_ACCEPT;
4387 def_rule->cmd[0].opcode = O_DENY;
4390 def_rule->refcnt = 1;
4391 def_rule->cpuid = mycpuid;
4393 /* Install the default rule */
4394 ctx->ipfw_default_rule = def_rule;
4395 ctx->ipfw_layer3_chain = def_rule;
4397 /* Link rule CPU sibling */
4398 ipfw_link_sibling(fwmsg, def_rule);
4400 /* Statistics only need to be updated once */
4402 ipfw_inc_static_count(def_rule);
4404 ifnet_forwardmsg(&nmsg->nm_lmsg, mycpuid + 1);
4408 ipfw_init_dispatch(struct netmsg *nmsg)
4410 struct netmsg_ipfw fwmsg;
4414 kprintf("IP firewall already loaded\n");
4419 bzero(&fwmsg, sizeof(fwmsg));
4420 netmsg_init(&fwmsg.nmsg, &curthread->td_msgport, 0,
4421 ipfw_ctx_init_dispatch);
4422 ifnet_domsg(&fwmsg.nmsg.nm_lmsg, 0);
4424 ip_fw_chk_ptr = ipfw_chk;
4425 ip_fw_ctl_ptr = ipfw_ctl;
4426 ip_fw_dn_io_ptr = ipfw_dummynet_io;
4428 kprintf("ipfw2 initialized, default to %s, logging ",
4429 ipfw_ctx[mycpuid]->ipfw_default_rule->cmd[0].opcode ==
4430 O_ACCEPT ? "accept" : "deny");
4432 #ifdef IPFIREWALL_VERBOSE
4435 #ifdef IPFIREWALL_VERBOSE_LIMIT
4436 verbose_limit = IPFIREWALL_VERBOSE_LIMIT;
4438 if (fw_verbose == 0) {
4439 kprintf("disabled\n");
4440 } else if (verbose_limit == 0) {
4441 kprintf("unlimited\n");
4443 kprintf("limited to %d packets/entry by default\n",
4447 callout_init_mp(&ipfw_timeout_h);
4448 netmsg_init(&ipfw_timeout_netmsg, &netisr_adone_rport,
4449 MSGF_MPSAFE | MSGF_DROPABLE | MSGF_PRIORITY,
4450 ipfw_tick_dispatch);
4451 lockinit(&dyn_lock, "ipfw_dyn", 0, 0);
4454 callout_reset(&ipfw_timeout_h, hz, ipfw_tick, NULL);
4459 lwkt_replymsg(&nmsg->nm_lmsg, error);
4467 netmsg_init(&smsg, &curthread->td_msgport, 0, ipfw_init_dispatch);
4468 return lwkt_domsg(IPFW_CFGPORT, &smsg.nm_lmsg, 0);
4474 ipfw_fini_dispatch(struct netmsg *nmsg)
4478 if (ipfw_refcnt != 0) {
4486 callout_stop(&ipfw_timeout_h);
4488 netmsg_service_sync();
4491 if ((ipfw_timeout_netmsg.nm_lmsg.ms_flags & MSGF_DONE) == 0) {
4493 * Callout message is pending; drop it
4495 lwkt_dropmsg(&ipfw_timeout_netmsg.nm_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->nm_lmsg, error);
4518 netmsg_init(&smsg, &curthread->td_msgport, 0, ipfw_fini_dispatch);
4519 return lwkt_domsg(IPFW_CFGPORT, &smsg.nm_lmsg, 0);
4522 #endif /* KLD_MODULE */
4525 ipfw_modevent(module_t mod, int type, void *unused)
4536 kprintf("ipfw statically compiled, cannot unload\n");
4548 static moduledata_t ipfwmod = {
4553 DECLARE_MODULE(ipfw, ipfwmod, SI_SUB_PROTO_END, SI_ORDER_ANY);
4554 MODULE_VERSION(ipfw, 1);
lentferj's projects / dragonfly.git / blob