1 /* 2 * Copyright (c) 1993 Daniel Boulet 3 * Copyright (c) 1994 Ugen J.S.Antsilevich 4 * Copyright (c) 2002 Luigi Rizzo, Universita` di Pisa 5 * Copyright (c) 2014 - 2018 The DragonFly Project. All rights reserved. 6 * 7 * This code is derived from software contributed to The DragonFly Project 8 * by Bill Yuan <bycn82@dragonflybsd.org> 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in 18 * the documentation and/or other materials provided with the 19 * distribution. 20 * 3. Neither the name of The DragonFly Project nor the names of its 21 * contributors may be used to endorse or promote products derived 22 * from this software without specific, prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 25 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 26 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 27 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 28 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 29 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 30 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 32 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 33 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 34 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 */ 38 39 #include "opt_ipfw.h" 40 #include "opt_inet.h" 41 #ifndef INET 42 #error IPFIREWALL3 requires INET. 43 #endif /* INET */ 44 45 #include <sys/param.h> 46 #include <sys/kernel.h> 47 #include <sys/malloc.h> 48 #include <sys/mbuf.h> 49 #include <sys/socketvar.h> 50 #include <sys/sysctl.h> 51 #include <sys/systimer.h> 52 #include <sys/in_cksum.h> 53 #include <sys/systm.h> 54 #include <sys/proc.h> 55 #include <sys/socket.h> 56 #include <sys/syslog.h> 57 #include <sys/ucred.h> 58 #include <sys/lock.h> 59 60 #include <net/if.h> 61 #include <net/radix.h> 62 #include <net/route.h> 63 #include <net/pfil.h> 64 #include <net/netmsg2.h> 65 66 #include <netinet/in.h> 67 #include <netinet/in_systm.h> 68 #include <netinet/in_var.h> 69 #include <netinet/in_pcb.h> 70 #include <netinet/ip.h> 71 #include <netinet/ip_var.h> 72 #include <netinet/ip_icmp.h> 73 #include <netinet/tcp.h> 74 #include <netinet/tcp_timer.h> 75 #include <netinet/tcp_var.h> 76 #include <netinet/tcpip.h> 77 #include <netinet/udp.h> 78 #include <netinet/udp_var.h> 79 #include <netinet/ip_divert.h> 80 #include <netinet/if_ether.h> 81 82 #include <net/ipfw3/ip_fw.h> 83 #include <net/ipfw3/ip_fw3_set.h> 84 #include <net/ipfw3_basic/ip_fw3_log.h> 85 #include <net/ipfw3_basic/ip_fw3_table.h> 86 #include <net/ipfw3_basic/ip_fw3_sync.h> 87 #include <net/ipfw3_basic/ip_fw3_basic.h> 88 #include <net/ipfw3_basic/ip_fw3_state.h> 89 #include <net/ipfw3_nat/ip_fw3_nat.h> 90 #include <net/dummynet3/ip_dummynet3.h> 91 92 MALLOC_DEFINE(M_IPFW3, "IPFW3", "ipfw3 module"); 93 94 #define MAX_MODULE 10 95 #define MAX_OPCODE_PER_MODULE 100 96 97 #define IPFW_AUTOINC_STEP_MIN 1 98 #define IPFW_AUTOINC_STEP_MAX 1000 99 #define IPFW_AUTOINC_STEP_DEF 100 100 101 102 struct netmsg_ipfw { 103 struct netmsg_base base; 104 const struct ipfw_ioc_rule *ioc_rule; 105 struct ip_fw *rule; 106 struct ip_fw *next_rule; 107 struct ip_fw *prev_rule; 108 struct ip_fw *sibling; /* sibling in prevous CPU */ 109 }; 110 111 struct netmsg_del { 112 struct netmsg_base base; 113 struct ip_fw *rule; 114 struct ip_fw *start_rule; 115 struct ip_fw *prev_rule; 116 struct ipfw_ioc_state *ioc_state; 117 uint16_t rulenum; 118 uint8_t set_from; 119 uint8_t set_to; 120 int kill_default; 121 }; 122 123 struct netmsg_zent { 124 struct netmsg_base base; 125 struct ip_fw *start_rule; 126 uint16_t rulenum; 127 uint16_t log_only; 128 }; 129 130 ip_fw_ctl_t *ip_fw3_ctl_nat_ptr = NULL; 131 ip_fw_ctl_t *ip_fw3_ctl_state_ptr = NULL; 132 ip_fw_ctl_t *ip_fw3_ctl_table_ptr = NULL; 133 ip_fw_ctl_t *ip_fw3_ctl_sync_ptr = NULL; 134 ip_fw_log_t *ip_fw3_log_ptr = NULL; 135 136 extern int ip_fw_loaded; 137 extern struct ipfw3_state_context *fw3_state_ctx[MAXCPU]; 138 int sysctl_var_fw3_enable = 1; 139 int sysctl_var_fw3_one_pass = 1; 140 int sysctl_var_fw3_verbose = 0; 141 static int sysctl_var_fw3_flushing; 142 static int sysctl_var_fw3_debug; 143 static int sysctl_var_autoinc_step = IPFW_AUTOINC_STEP_DEF; 144 145 int ip_fw3_sysctl_enable(SYSCTL_HANDLER_ARGS); 146 int ip_fw3_sysctl_autoinc_step(SYSCTL_HANDLER_ARGS); 147 148 SYSCTL_NODE(_net_inet_ip, OID_AUTO, fw3, CTLFLAG_RW, 0, "Firewall"); 149 SYSCTL_PROC(_net_inet_ip_fw3, OID_AUTO, enable, CTLTYPE_INT | CTLFLAG_RW, 150 &sysctl_var_fw3_enable, 0, ip_fw3_sysctl_enable, "I", "Enable ipfw"); 151 SYSCTL_PROC(_net_inet_ip_fw3, OID_AUTO, sysctl_var_autoinc_step, 152 CTLTYPE_INT | CTLFLAG_RW, &sysctl_var_autoinc_step, 0, 153 ip_fw3_sysctl_autoinc_step, "I", "Rule number autincrement step"); 154 SYSCTL_INT(_net_inet_ip_fw3, OID_AUTO,one_pass,CTLFLAG_RW, 155 &sysctl_var_fw3_one_pass, 0, 156 "Only do a single pass through ipfw3 when using dummynet(4)"); 157 SYSCTL_INT(_net_inet_ip_fw3, OID_AUTO, debug, CTLFLAG_RW, 158 &sysctl_var_fw3_debug, 0, "Enable printing of debug ip_fw statements"); 159 SYSCTL_INT(_net_inet_ip_fw3, OID_AUTO, verbose, CTLFLAG_RW, 160 &sysctl_var_fw3_verbose, 0, "Log matches to ipfw3 rules"); 161 162 163 filter_func filter_funcs[MAX_MODULE][MAX_OPCODE_PER_MODULE]; 164 struct ipfw3_module fw3_modules[MAX_MODULE]; 165 struct ipfw3_context *fw3_ctx[MAXCPU]; 166 struct ipfw3_sync_context fw3_sync_ctx; 167 168 169 void 170 ip_fw3_register_module(int module_id,char *module_name) 171 { 172 struct ipfw3_module *tmp; 173 int i; 174 175 tmp = fw3_modules; 176 for (i=0; i < MAX_MODULE; i++) { 177 if (tmp->type == 0) { 178 tmp->type = 1; 179 tmp->id = module_id; 180 strncpy(tmp->name, module_name, strlen(module_name)); 181 break; 182 } 183 tmp++; 184 } 185 kprintf("ipfw3 module %s loaded\n", module_name); 186 } 187 188 int 189 ip_fw3_unregister_module(int module_id) 190 { 191 struct ipfw3_module *tmp; 192 struct ip_fw *fw; 193 ipfw_insn *cmd; 194 int i, len, cmdlen, found; 195 196 found = 0; 197 tmp = fw3_modules; 198 struct ipfw3_context *ctx = fw3_ctx[mycpuid]; 199 fw = ctx->rules; 200 for (; fw; fw = fw->next) { 201 for (len = fw->cmd_len, cmd = fw->cmd; len > 0; 202 len -= cmdlen, 203 cmd = (ipfw_insn *)((uint32_t *)cmd + cmdlen)) { 204 cmdlen = F_LEN(cmd); 205 if (cmd->module == 0 && 206 (cmd->opcode == 0 || cmd->opcode == 1)) { 207 //action accept or deny 208 } else if (cmd->module == module_id) { 209 found = 1; 210 goto decide; 211 } 212 } 213 } 214 decide: 215 if (found) { 216 return 1; 217 } else { 218 for (i = 0; i < MAX_MODULE; i++) { 219 if (tmp->type == 1 && tmp->id == module_id) { 220 tmp->type = 0; 221 kprintf("ipfw3 module %s unloaded\n", 222 tmp->name); 223 break; 224 } 225 tmp++; 226 } 227 228 for (i = 0; i < MAX_OPCODE_PER_MODULE; i++) { 229 if (module_id == 0) { 230 if (i ==0 || i == 1) { 231 continue; 232 } 233 } 234 filter_funcs[module_id][i] = NULL; 235 } 236 return 0; 237 } 238 } 239 240 void 241 ip_fw3_register_filter_funcs(int module, int opcode, filter_func func) 242 { 243 filter_funcs[module][opcode] = func; 244 } 245 246 void 247 check_accept(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args, 248 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len) 249 { 250 *cmd_val = IP_FW_PASS; 251 *cmd_ctl = IP_FW_CTL_DONE; 252 if (cmd->arg3 && ip_fw3_log_ptr != NULL) { 253 ip_fw3_log_ptr((*args)->m, (*args)->eh, cmd->arg1); 254 } 255 } 256 257 void 258 check_deny(int *cmd_ctl, int *cmd_val, struct ip_fw_args **args, 259 struct ip_fw **f, ipfw_insn *cmd, uint16_t ip_len) 260 { 261 *cmd_val = IP_FW_DENY; 262 *cmd_ctl = IP_FW_CTL_DONE; 263 if (cmd->arg3 && ip_fw3_log_ptr != NULL) { 264 ip_fw3_log_ptr((*args)->m, (*args)->eh, cmd->arg1); 265 } 266 } 267 268 void 269 init_module(void) 270 { 271 memset(fw3_modules, 0, sizeof(struct ipfw3_module) * MAX_MODULE); 272 memset(filter_funcs, 0, sizeof(filter_func) * 273 MAX_OPCODE_PER_MODULE * MAX_MODULE); 274 ip_fw3_register_filter_funcs(0, O_BASIC_ACCEPT, 275 (filter_func)check_accept); 276 ip_fw3_register_filter_funcs(0, O_BASIC_DENY, (filter_func)check_deny); 277 } 278 279 int 280 ip_fw3_free_rule(struct ip_fw *rule) 281 { 282 kfree(rule, M_IPFW3); 283 rule = NULL; 284 return 1; 285 } 286 287 static struct ip_fw * 288 lookup_next_rule(struct ip_fw *me) 289 { 290 struct ip_fw *rule = NULL; 291 ipfw_insn *cmd; 292 293 /* look for action, in case it is a skipto */ 294 cmd = ACTION_PTR(me); 295 if ((int)cmd->module == MODULE_BASIC_ID && 296 (int)cmd->opcode == O_BASIC_SKIPTO) { 297 for (rule = me->next; rule; rule = rule->next) { 298 if (rule->rulenum >= cmd->arg1) 299 break; 300 } 301 } 302 if (rule == NULL) { /* failure or not a skipto */ 303 rule = me->next; 304 } 305 me->next_rule = rule; 306 return rule; 307 } 308 309 /* 310 * rules are stored in ctx->ipfw_rule_chain. 311 * and each rule is combination of multiple cmds.(ipfw_insn) 312 * in each rule, it begin with filter cmds. and end with action cmds. 313 * 'outer/inner loop' are looping the rules/cmds. 314 * it will invoke the cmds relatived function according to the cmd's 315 * module id and opcode id. and process according to return value. 316 */ 317 int 318 ip_fw3_chk(struct ip_fw_args *args) 319 { 320 struct tcphdr *tcp; 321 struct udphdr *udp; 322 struct icmp *icmp; 323 324 struct mbuf *m = args->m; 325 struct ip *ip = mtod(m, struct ip *); 326 struct ip_fw *f = NULL; /* matching rule */ 327 int cmd_val = IP_FW_PASS; 328 struct m_tag *mtag; 329 struct divert_info *divinfo; 330 331 /* 332 * hlen The length of the IPv4 header. 333 * hlen >0 means we have an IPv4 packet. 334 */ 335 u_int hlen = 0; /* hlen >0 means we have an IP pkt */ 336 337 /* 338 * offset The offset of a fragment. offset != 0 means that 339 * we have a fragment at this offset of an IPv4 packet. 340 * offset == 0 means that (if this is an IPv4 packet) 341 * this is the first or only fragment. 342 */ 343 u_short offset = 0; 344 345 uint8_t proto; 346 uint16_t src_port = 0, dst_port = 0; /* NOTE: host format */ 347 struct in_addr src_ip, dst_ip; /* NOTE: network format */ 348 uint16_t ip_len = 0; 349 uint8_t prev_module = -1, prev_opcode = -1; /* previous module & opcode */ 350 struct ipfw3_context *ctx = fw3_ctx[mycpuid]; 351 352 if (m->m_pkthdr.fw_flags & IPFW_MBUF_GENERATED) 353 return IP_FW_PASS; /* accept */ 354 355 if (args->eh == NULL || /* layer 3 packet */ 356 (m->m_pkthdr.len >= sizeof(struct ip) && 357 ntohs(args->eh->ether_type) == ETHERTYPE_IP)) 358 hlen = ip->ip_hl << 2; 359 360 /* 361 * Collect parameters into local variables for faster matching. 362 */ 363 if (hlen == 0) { /* do not grab addresses for non-ip pkts */ 364 proto = args->f_id.proto = 0; /* mark f_id invalid */ 365 goto after_ip_checks; 366 } 367 368 proto = args->f_id.proto = ip->ip_p; 369 src_ip = ip->ip_src; 370 dst_ip = ip->ip_dst; 371 offset = ntohs(ip->ip_off) & IP_OFFMASK; 372 ip_len = ntohs(ip->ip_len); 373 374 #define PULLUP_TO(len) \ 375 do { \ 376 if (m->m_len < (len)) { \ 377 args->m = m = m_pullup(m, (len)); \ 378 if (m == NULL) \ 379 goto pullup_failed; \ 380 ip = mtod(m, struct ip *); \ 381 } \ 382 } while (0) 383 384 if (offset == 0) { 385 switch (proto) { 386 case IPPROTO_TCP: 387 PULLUP_TO(hlen + sizeof(struct tcphdr)); 388 tcp = L3HDR(struct tcphdr, ip); 389 dst_port = tcp->th_dport; 390 src_port = tcp->th_sport; 391 args->f_id.flags = tcp->th_flags; 392 break; 393 case IPPROTO_UDP: 394 PULLUP_TO(hlen + sizeof(struct udphdr)); 395 udp = L3HDR(struct udphdr, ip); 396 dst_port = udp->uh_dport; 397 src_port = udp->uh_sport; 398 break; 399 case IPPROTO_ICMP: 400 PULLUP_TO(hlen + 4); 401 icmp = L3HDR(struct icmp, ip); 402 args->f_id.flags = icmp->icmp_type; 403 dst_port = icmp->icmp_id; 404 src_port = dst_port; 405 break; 406 default: 407 break; 408 } 409 } 410 411 #undef PULLUP_TO 412 413 args->f_id.src_ip = ntohl(src_ip.s_addr); 414 args->f_id.dst_ip = ntohl(dst_ip.s_addr); 415 args->f_id.src_port = src_port = ntohs(src_port); 416 args->f_id.dst_port = dst_port = ntohs(dst_port); 417 418 after_ip_checks: 419 if (args->rule) { 420 /* 421 * Packet has already been tagged. Look for the next rule 422 * to restart processing. 423 * 424 * If sysctl_var_fw3_one_pass != 0 then just accept it. 425 * XXX should not happen here, but optimized out in 426 * the caller. 427 */ 428 if (sysctl_var_fw3_one_pass) 429 return IP_FW_PASS; 430 431 /* This rule is being/has been flushed */ 432 if (sysctl_var_fw3_flushing) 433 return IP_FW_DENY; 434 435 f = args->rule->next_rule; 436 if (f == NULL) 437 f = lookup_next_rule(args->rule); 438 } else { 439 /* 440 * Find the starting rule. It can be either the first 441 * one, or the one after divert_rule if asked so. 442 */ 443 int skipto; 444 445 mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL); 446 if (mtag != NULL) { 447 divinfo = m_tag_data(mtag); 448 skipto = divinfo->skipto; 449 } else { 450 skipto = 0; 451 } 452 453 f = ctx->rules; 454 if (args->eh == NULL && skipto != 0) { 455 /* No skipto during rule flushing */ 456 if (sysctl_var_fw3_flushing) { 457 return IP_FW_DENY; 458 } 459 if (skipto >= IPFW_DEFAULT_RULE) { 460 return IP_FW_DENY; /* invalid */ 461 } 462 while (f && f->rulenum <= skipto) { 463 f = f->next; 464 } 465 if (f == NULL) { /* drop packet */ 466 return IP_FW_DENY; 467 } 468 } else if (sysctl_var_fw3_flushing) { 469 /* Rules are being flushed; skip to default rule */ 470 f = ctx->default_rule; 471 } 472 } 473 if ((mtag = m_tag_find(m, PACKET_TAG_IPFW_DIVERT, NULL)) != NULL) { 474 m_tag_delete(m, mtag); 475 } 476 477 /* 478 * Now scan the rules, and parse microinstructions for each rule. 479 */ 480 int prev_val; /* previous result of 'or' filter */ 481 int l, cmdlen; 482 ipfw_insn *cmd; 483 int cmd_ctl; 484 /* foreach rule in chain */ 485 for (; f; f = f->next) { 486 again: /* check the rule again*/ 487 if (ctx->sets & (1 << f->set)) { 488 continue; 489 } 490 491 prev_val = -1; 492 /* foreach cmd in rule */ 493 for (l = f->cmd_len, cmd = f->cmd; l > 0; l -= cmdlen, 494 cmd = (ipfw_insn *)((uint32_t *)cmd+ cmdlen)) { 495 cmdlen = F_LEN(cmd); 496 497 /* skip 'or' filter when already match */ 498 if (cmd->len & F_OR && 499 cmd->module == prev_module && 500 cmd->opcode == prev_opcode && 501 prev_val == 1) { 502 goto next_cmd; 503 } 504 505 check_body: /* check the body of the rule again.*/ 506 (filter_funcs[cmd->module][cmd->opcode]) 507 (&cmd_ctl, &cmd_val, &args, &f, cmd, ip_len); 508 switch(cmd_ctl) { 509 case IP_FW_CTL_DONE: 510 if (prev_val == 0) /* but 'or' failed */ 511 goto next_rule; 512 goto done; 513 case IP_FW_CTL_AGAIN: 514 goto again; 515 case IP_FW_CTL_NEXT: 516 goto next_rule; 517 case IP_FW_CTL_NAT: 518 args->rule=f; 519 goto done; 520 case IP_FW_CTL_CHK_STATE: 521 /* update the cmd and l */ 522 cmd = ACTION_PTR(f); 523 l = f->cmd_len - f->act_ofs; 524 goto check_body; 525 } 526 if (cmd->len & F_NOT) 527 cmd_val= !cmd_val; 528 529 if (cmd->len & F_OR) { /* has 'or' */ 530 if (!cmd_val) { /* not matched */ 531 if(prev_val == -1){ /* first 'or' */ 532 prev_val = 0; 533 prev_module = cmd->module; 534 prev_opcode = cmd->opcode; 535 } else if (prev_module == cmd->module && 536 prev_opcode == cmd->opcode) { 537 /* continuous 'or' filter */ 538 } else if (prev_module != cmd->module || 539 prev_opcode != cmd->opcode) { 540 /* 'or' filter changed */ 541 if(prev_val == 0){ 542 goto next_rule; 543 } else { 544 prev_val = 0; 545 prev_module = cmd->module; 546 prev_opcode = cmd->opcode; 547 } 548 } 549 } else { /* has 'or' and matched */ 550 prev_val = 1; 551 prev_module = cmd->module; 552 prev_opcode = cmd->opcode; 553 } 554 } else { /* no or */ 555 if (!cmd_val) { /* not matched */ 556 goto next_rule; 557 } else { 558 if (prev_val == 0) { 559 /* previous 'or' not matched */ 560 goto next_rule; 561 } else { 562 prev_val = -1; 563 } 564 } 565 } 566 next_cmd:; 567 } /* end of inner for, scan opcodes */ 568 next_rule:; /* try next rule */ 569 } /* end of outer for, scan rules */ 570 kprintf("+++ ipfw: ouch!, skip past end of rules, denying packet\n"); 571 return IP_FW_DENY; 572 573 done: 574 /* Update statistics */ 575 f->pcnt++; 576 f->bcnt += ip_len; 577 f->timestamp = time_second; 578 return cmd_val; 579 580 pullup_failed: 581 if (sysctl_var_fw3_verbose) 582 kprintf("pullup failed\n"); 583 return IP_FW_DENY; 584 } 585 586 struct mbuf * 587 ip_fw3_dummynet_io(struct mbuf *m, int pipe_nr, int dir, struct ip_fw_args *fwa) 588 { 589 struct m_tag *mtag; 590 struct dn_pkt *pkt; 591 ipfw_insn *cmd; 592 const struct ipfw_flow_id *id; 593 struct dn_flow_id *fid; 594 595 M_ASSERTPKTHDR(m); 596 597 mtag = m_tag_get(PACKET_TAG_DUMMYNET, sizeof(*pkt), 598 M_INTWAIT | M_NULLOK); 599 if (mtag == NULL) { 600 m_freem(m); 601 return (NULL); 602 } 603 m_tag_prepend(m, mtag); 604 605 pkt = m_tag_data(mtag); 606 bzero(pkt, sizeof(*pkt)); 607 608 cmd = (ipfw_insn *)((uint32_t *)fwa->rule->cmd + fwa->rule->act_ofs); 609 KASSERT(cmd->opcode == O_DUMMYNET_PIPE || 610 cmd->opcode == O_DUMMYNET_QUEUE, 611 ("Rule is not PIPE or QUEUE, opcode %d", cmd->opcode)); 612 613 pkt->dn_m = m; 614 pkt->dn_flags = (dir & DN_FLAGS_DIR_MASK); 615 pkt->ifp = fwa->oif; 616 pkt->pipe_nr = pipe_nr; 617 618 pkt->cpuid = mycpuid; 619 pkt->msgport = netisr_curport(); 620 621 id = &fwa->f_id; 622 fid = &pkt->id; 623 fid->fid_dst_ip = id->dst_ip; 624 fid->fid_src_ip = id->src_ip; 625 fid->fid_dst_port = id->dst_port; 626 fid->fid_src_port = id->src_port; 627 fid->fid_proto = id->proto; 628 fid->fid_flags = id->flags; 629 630 pkt->dn_priv = fwa->rule; 631 632 if ((int)cmd->opcode == O_DUMMYNET_PIPE) 633 pkt->dn_flags |= DN_FLAGS_IS_PIPE; 634 635 m->m_pkthdr.fw_flags |= DUMMYNET_MBUF_TAGGED; 636 return (m); 637 } 638 639 640 void 641 add_rule_dispatch(netmsg_t nmsg) 642 { 643 struct netmsg_ipfw *fwmsg = (struct netmsg_ipfw *)nmsg; 644 struct ipfw3_context *ctx = fw3_ctx[mycpuid]; 645 struct ip_fw *rule, *prev,*next; 646 const struct ipfw_ioc_rule *ioc_rule; 647 648 ioc_rule = fwmsg->ioc_rule; 649 // create rule by ioc_rule 650 rule = kmalloc(RULESIZE(ioc_rule), M_IPFW3, M_WAITOK | M_ZERO); 651 rule->act_ofs = ioc_rule->act_ofs; 652 rule->cmd_len = ioc_rule->cmd_len; 653 rule->rulenum = ioc_rule->rulenum; 654 rule->set = ioc_rule->set; 655 bcopy(ioc_rule->cmd, rule->cmd, rule->cmd_len * 4); 656 657 for (prev = NULL, next = ctx->rules; 658 next; prev = next, next = next->next) { 659 if (ioc_rule->insert) { 660 if (next->rulenum >= ioc_rule->rulenum) { 661 break; 662 } 663 } else { 664 if (next->rulenum > ioc_rule->rulenum) { 665 break; 666 } 667 } 668 } 669 KASSERT(next != NULL, ("no default rule?!")); 670 671 /* 672 * Insert rule into the pre-determined position 673 */ 674 if (prev != NULL) { 675 rule->next = next; 676 prev->next = rule; 677 } else { 678 rule->next = ctx->rules; 679 ctx->rules = rule; 680 } 681 682 /* 683 * if sibiling in last CPU is exists, 684 * then it's sibling should be current rule 685 */ 686 if (fwmsg->sibling != NULL) { 687 fwmsg->sibling->sibling = rule; 688 } 689 /* prepare for next CPU */ 690 fwmsg->sibling = rule; 691 692 netisr_forwardmsg_all(&nmsg->base, mycpuid + 1); 693 } 694 695 /* 696 * confirm the rulenumber 697 * call dispatch function to add rule into the list 698 * Update the statistic 699 */ 700 void 701 ip_fw3_add_rule(struct ipfw_ioc_rule *ioc_rule) 702 { 703 struct ipfw3_context *ctx = fw3_ctx[mycpuid]; 704 struct netmsg_ipfw fwmsg; 705 struct netmsg_base *nmsg; 706 struct ip_fw *f; 707 708 IPFW_ASSERT_CFGPORT(&curthread->td_msgport); 709 710 /* 711 * If rulenum is 0, find highest numbered rule before the 712 * default rule, and add rule number incremental step. 713 */ 714 if (ioc_rule->rulenum == 0) { 715 int step = sysctl_var_autoinc_step; 716 717 KKASSERT(step >= IPFW_AUTOINC_STEP_MIN && 718 step <= IPFW_AUTOINC_STEP_MAX); 719 720 /* 721 * Locate the highest numbered rule before default 722 */ 723 for (f = ctx->rules; f; f = f->next) { 724 if (f->rulenum == IPFW_DEFAULT_RULE) 725 break; 726 ioc_rule->rulenum = f->rulenum; 727 } 728 if (ioc_rule->rulenum < IPFW_DEFAULT_RULE - step) 729 ioc_rule->rulenum += step; 730 } 731 KASSERT(ioc_rule->rulenum != IPFW_DEFAULT_RULE && 732 ioc_rule->rulenum != 0, 733 ("invalid rule num %d", ioc_rule->rulenum)); 734 735 bzero(&fwmsg, sizeof(fwmsg)); 736 nmsg = &fwmsg.base; 737 netmsg_init(nmsg, NULL, &curthread->td_msgport, 738 0, add_rule_dispatch); 739 fwmsg.ioc_rule = ioc_rule; 740 741 netisr_domsg(nmsg, 0); 742 743 IPFW3_DEBUG("++ installed rule %d, static count now %d\n", 744 ioc_rule->rulenum, static_count); 745 } 746 747 /** 748 * Free storage associated with a static rule (including derived 749 * dynamic rules). 750 * The caller is in charge of clearing rule pointers to avoid 751 * dangling pointers. 752 * @return a pointer to the next entry. 753 * Arguments are not checked, so they better be correct. 754 * Must be called at splimp(). 755 */ 756 struct ip_fw * 757 ip_fw3_delete_rule(struct ipfw3_context *ctx, 758 struct ip_fw *prev, struct ip_fw *rule) 759 { 760 if (prev == NULL) 761 ctx->rules = rule->next; 762 else 763 prev->next = rule->next; 764 765 kfree(rule, M_IPFW3); 766 rule = NULL; 767 return NULL; 768 } 769 770 void 771 flush_rule_dispatch(netmsg_t nmsg) 772 { 773 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg; 774 struct ipfw3_context *ctx = fw3_ctx[mycpuid]; 775 struct ip_fw *rule, *the_rule; 776 int kill_default = dmsg->kill_default; 777 778 rule = ctx->rules; 779 while (rule != NULL) { 780 if (rule->rulenum == IPFW_DEFAULT_RULE && kill_default == 0) { 781 ctx->rules = rule; 782 break; 783 } 784 the_rule = rule; 785 rule = rule->next; 786 787 kfree(the_rule, M_IPFW3); 788 } 789 790 netisr_forwardmsg_all(&nmsg->base, mycpuid + 1); 791 } 792 793 794 /* 795 * Deletes all rules from a chain (including the default rule 796 * if the second argument is set). 797 * Must be called at splimp(). 798 */ 799 void 800 ip_fw3_ctl_flush_rule(int kill_default) 801 { 802 struct netmsg_del dmsg; 803 804 IPFW_ASSERT_CFGPORT(&curthread->td_msgport); 805 806 if (!kill_default) { 807 sysctl_var_fw3_flushing = 1; 808 netmsg_service_sync(); 809 } 810 /* 811 * Press the 'flush' button 812 */ 813 bzero(&dmsg, sizeof(dmsg)); 814 netmsg_init(&dmsg.base, NULL, &curthread->td_msgport, 815 0, flush_rule_dispatch); 816 dmsg.kill_default = kill_default; 817 netisr_domsg(&dmsg.base, 0); 818 819 /* Flush is done */ 820 sysctl_var_fw3_flushing = 0; 821 } 822 823 void 824 delete_rule_dispatch(netmsg_t nmsg) 825 { 826 struct netmsg_del *dmsg = (struct netmsg_del *)nmsg; 827 struct ipfw3_context *ctx = fw3_ctx[mycpuid]; 828 struct ip_fw *rule, *prev = NULL; 829 830 rule = ctx->rules; 831 while (rule!=NULL) { 832 if (rule->rulenum == dmsg->rulenum) { 833 ip_fw3_delete_rule(ctx, prev, rule); 834 break; 835 } 836 prev = rule; 837 rule = rule->next; 838 } 839 840 netisr_forwardmsg_all(&nmsg->base, mycpuid + 1); 841 } 842 843 int 844 ip_fw3_ctl_delete_rule(struct sockopt *sopt) 845 { 846 struct netmsg_del dmsg; 847 struct netmsg_base *nmsg; 848 int *rulenum; 849 850 rulenum = (int *) sopt->sopt_val; 851 852 853 /* 854 * Get rid of the rule duplications on all CPUs 855 */ 856 bzero(&dmsg, sizeof(dmsg)); 857 nmsg = &dmsg.base; 858 netmsg_init(nmsg, NULL, &curthread->td_msgport, 859 0, delete_rule_dispatch); 860 dmsg.rulenum = *rulenum; 861 netisr_domsg(nmsg, 0); 862 return 0; 863 } 864 865 /* 866 * Clear counters for a specific rule. 867 */ 868 void 869 ip_fw3_clear_counters(struct ip_fw *rule) 870 { 871 rule->bcnt = rule->pcnt = 0; 872 rule->timestamp = 0; 873 } 874 875 void 876 ip_fw3_zero_entry_dispatch(netmsg_t nmsg) 877 { 878 struct netmsg_zent *zmsg = (struct netmsg_zent *)nmsg; 879 struct ipfw3_context *ctx = fw3_ctx[mycpuid]; 880 struct ip_fw *rule; 881 882 if (zmsg->rulenum == 0) { 883 for (rule = ctx->rules; rule; rule = rule->next) { 884 ip_fw3_clear_counters(rule); 885 } 886 } else { 887 for (rule = ctx->rules; rule; rule = rule->next) { 888 if (rule->rulenum == zmsg->rulenum) { 889 ip_fw3_clear_counters(rule); 890 } 891 } 892 } 893 ip_fw3_clear_counters(ctx->default_rule); 894 netisr_forwardmsg_all(&nmsg->base, mycpuid + 1); 895 } 896 897 /** 898 * Reset some or all counters on firewall rules. 899 * @arg frwl is null to clear all entries, or contains a specific 900 * rule number. 901 * @arg log_only is 1 if we only want to reset logs, zero otherwise. 902 */ 903 int 904 ip_fw3_ctl_zero_entry(int rulenum, int log_only) 905 { 906 struct netmsg_zent zmsg; 907 struct netmsg_base *nmsg; 908 const char *msg; 909 struct ipfw3_context *ctx = fw3_ctx[mycpuid]; 910 911 bzero(&zmsg, sizeof(zmsg)); 912 nmsg = &zmsg.base; 913 netmsg_init(nmsg, NULL, &curthread->td_msgport, 914 0, ip_fw3_zero_entry_dispatch); 915 zmsg.log_only = log_only; 916 917 if (rulenum == 0) { 918 msg = log_only ? "ipfw: All logging counts reset.\n" 919 : "ipfw: Accounting cleared.\n"; 920 } else { 921 struct ip_fw *rule; 922 923 /* 924 * Locate the first rule with 'rulenum' 925 */ 926 for (rule = ctx->rules; rule; rule = rule->next) { 927 if (rule->rulenum == rulenum) 928 break; 929 } 930 if (rule == NULL) /* we did not find any matching rules */ 931 return (EINVAL); 932 zmsg.start_rule = rule; 933 zmsg.rulenum = rulenum; 934 935 msg = log_only ? "ipfw: Entry %d logging count reset.\n" 936 : "ipfw: Entry %d cleared.\n"; 937 } 938 netisr_domsg(nmsg, 0); 939 KKASSERT(zmsg.start_rule == NULL); 940 941 if (sysctl_var_fw3_verbose) 942 log(LOG_SECURITY | LOG_NOTICE, msg, rulenum); 943 return (0); 944 } 945 946 /* 947 * Get the ioc_rule from the sopt 948 * call ip_fw3_add_rule to add the rule 949 */ 950 int 951 ip_fw3_ctl_add_rule(struct sockopt *sopt) 952 { 953 struct ipfw_ioc_rule *ioc_rule; 954 size_t size; 955 956 size = sopt->sopt_valsize; 957 if (size > (sizeof(uint32_t) * IPFW_RULE_SIZE_MAX) || 958 size < sizeof(*ioc_rule) - sizeof(ipfw_insn)) { 959 return EINVAL; 960 } 961 if (size != (sizeof(uint32_t) * IPFW_RULE_SIZE_MAX)) { 962 sopt->sopt_val = krealloc(sopt->sopt_val, sizeof(uint32_t) * 963 IPFW_RULE_SIZE_MAX, M_TEMP, M_WAITOK); 964 } 965 ioc_rule = sopt->sopt_val; 966 967 ip_fw3_add_rule(ioc_rule); 968 return 0; 969 } 970 971 int 972 ip_fw3_ctl_get_modules(struct sockopt *sopt) 973 { 974 int i; 975 struct ipfw3_module *mod; 976 char module_str[1024]; 977 memset(module_str,0,1024); 978 for (i = 0, mod = fw3_modules; i < MAX_MODULE; i++, mod++) { 979 if (mod->type != 0) { 980 if (i > 0) 981 strcat(module_str,","); 982 strcat(module_str,mod->name); 983 } 984 } 985 bzero(sopt->sopt_val, sopt->sopt_valsize); 986 bcopy(module_str, sopt->sopt_val, strlen(module_str)); 987 sopt->sopt_valsize = strlen(module_str); 988 return 0; 989 } 990 991 /* 992 * Copy all static rules and states on all CPU 993 */ 994 int 995 ip_fw3_ctl_get_rules(struct sockopt *sopt) 996 { 997 struct ipfw3_context *ctx = fw3_ctx[mycpuid]; 998 struct ip_fw *rule; 999 struct ipfw_ioc_rule *ioc; 1000 const struct ip_fw *sibling; 1001 int total_len = 0; 1002 1003 ioc = (struct ipfw_ioc_rule *)sopt->sopt_val; 1004 1005 for (rule = ctx->rules; rule; rule = rule->next) { 1006 total_len += IOC_RULESIZE(rule); 1007 if (total_len > sopt->sopt_valsize) { 1008 bzero(sopt->sopt_val, sopt->sopt_valsize); 1009 return 0; 1010 } 1011 ioc->act_ofs = rule->act_ofs; 1012 ioc->cmd_len = rule->cmd_len; 1013 ioc->rulenum = rule->rulenum; 1014 ioc->set = rule->set; 1015 1016 ioc->sets = fw3_ctx[mycpuid]->sets; 1017 ioc->pcnt = 0; 1018 ioc->bcnt = 0; 1019 ioc->timestamp = 0; 1020 for (sibling = rule; sibling != NULL; sibling = sibling->sibling) { 1021 ioc->pcnt += sibling->pcnt; 1022 ioc->bcnt += sibling->bcnt; 1023 if (sibling->timestamp > ioc->timestamp) 1024 ioc->timestamp = sibling->timestamp; 1025 } 1026 bcopy(rule->cmd, ioc->cmd, ioc->cmd_len * 4); 1027 ioc = (struct ipfw_ioc_rule *)((uint8_t *)ioc + IOC_RULESIZE(ioc)); 1028 } 1029 sopt->sopt_valsize = total_len; 1030 return 0; 1031 } 1032 1033 1034 /* 1035 * ip_fw3_ctl_x - extended version of ip_fw3_ctl 1036 * remove the x_header, and adjust the sopt_name, sopt_val and sopt_valsize. 1037 */ 1038 int 1039 ip_fw3_ctl_x(struct sockopt *sopt) 1040 { 1041 ip_fw_x_header *x_header; 1042 x_header = (ip_fw_x_header *)(sopt->sopt_val); 1043 sopt->sopt_name = x_header->opcode; 1044 sopt->sopt_valsize -= sizeof(ip_fw_x_header); 1045 bcopy(++x_header, sopt->sopt_val, sopt->sopt_valsize); 1046 return ip_fw3_ctl(sopt); 1047 } 1048 1049 1050 /** 1051 * {set|get}sockopt parser. 1052 */ 1053 int 1054 ip_fw3_ctl(struct sockopt *sopt) 1055 { 1056 int error = 0; 1057 switch (sopt->sopt_name) { 1058 case IP_FW_X: 1059 ip_fw3_ctl_x(sopt); 1060 break; 1061 case IP_FW_GET: 1062 case IP_FW_MODULE: 1063 case IP_FW_FLUSH: 1064 case IP_FW_ADD: 1065 case IP_FW_DEL: 1066 case IP_FW_ZERO: 1067 case IP_FW_RESETLOG: 1068 error = ip_fw3_ctl_sockopt(sopt); 1069 break; 1070 case IP_FW_SET_GET: 1071 case IP_FW_SET_MOVE_RULE: 1072 case IP_FW_SET_MOVE_SET: 1073 case IP_FW_SET_SWAP: 1074 case IP_FW_SET_TOGGLE: 1075 error = ip_fw3_ctl_set_sockopt(sopt); 1076 break; 1077 case IP_FW_NAT_ADD: 1078 case IP_FW_NAT_DEL: 1079 case IP_FW_NAT_FLUSH: 1080 case IP_FW_NAT_GET: 1081 case IP_FW_NAT_GET_RECORD: 1082 if (ip_fw3_ctl_nat_ptr != NULL) { 1083 error = ip_fw3_ctl_nat_ptr(sopt); 1084 } 1085 break; 1086 case IP_DUMMYNET_GET: 1087 case IP_DUMMYNET_CONFIGURE: 1088 case IP_DUMMYNET_DEL: 1089 case IP_DUMMYNET_FLUSH: 1090 error = ip_dn_sockopt(sopt); 1091 break; 1092 case IP_FW_STATE_ADD: 1093 case IP_FW_STATE_DEL: 1094 case IP_FW_STATE_FLUSH: 1095 case IP_FW_STATE_GET: 1096 if (ip_fw3_ctl_state_ptr != NULL) { 1097 error = ip_fw3_ctl_state_ptr(sopt); 1098 } 1099 break; 1100 case IP_FW_TABLE_CREATE: 1101 case IP_FW_TABLE_DELETE: 1102 case IP_FW_TABLE_APPEND: 1103 case IP_FW_TABLE_REMOVE: 1104 case IP_FW_TABLE_LIST: 1105 case IP_FW_TABLE_FLUSH: 1106 case IP_FW_TABLE_SHOW: 1107 case IP_FW_TABLE_TEST: 1108 case IP_FW_TABLE_RENAME: 1109 if (ip_fw3_ctl_table_ptr != NULL) { 1110 error = ip_fw3_ctl_table_ptr(sopt); 1111 } 1112 break; 1113 case IP_FW_SYNC_SHOW_CONF: 1114 case IP_FW_SYNC_SHOW_STATUS: 1115 case IP_FW_SYNC_EDGE_CONF: 1116 case IP_FW_SYNC_EDGE_START: 1117 case IP_FW_SYNC_EDGE_STOP: 1118 case IP_FW_SYNC_EDGE_TEST: 1119 case IP_FW_SYNC_EDGE_CLEAR: 1120 case IP_FW_SYNC_CENTRE_CONF: 1121 case IP_FW_SYNC_CENTRE_START: 1122 case IP_FW_SYNC_CENTRE_STOP: 1123 case IP_FW_SYNC_CENTRE_TEST: 1124 case IP_FW_SYNC_CENTRE_CLEAR: 1125 if (ip_fw3_ctl_sync_ptr != NULL) { 1126 error = ip_fw3_ctl_sync_ptr(sopt); 1127 } 1128 break; 1129 default: 1130 kprintf("ip_fw3_ctl invalid option %d\n", 1131 sopt->sopt_name); 1132 error = EINVAL; 1133 } 1134 return error; 1135 } 1136 1137 int 1138 ip_fw3_ctl_sockopt(struct sockopt *sopt) 1139 { 1140 int error = 0, rulenum; 1141 1142 switch (sopt->sopt_name) { 1143 case IP_FW_GET: 1144 error = ip_fw3_ctl_get_rules(sopt); 1145 break; 1146 case IP_FW_MODULE: 1147 error = ip_fw3_ctl_get_modules(sopt); 1148 break; 1149 case IP_FW_FLUSH: 1150 ip_fw3_ctl_flush_rule(0); 1151 break; 1152 case IP_FW_ADD: 1153 error = ip_fw3_ctl_add_rule(sopt); 1154 break; 1155 case IP_FW_DEL: 1156 error = ip_fw3_ctl_delete_rule(sopt); 1157 break; 1158 case IP_FW_ZERO: 1159 case IP_FW_RESETLOG: /* argument is an int, the rule number */ 1160 rulenum = 0; 1161 if (sopt->sopt_valsize != 0) { 1162 error = soopt_to_kbuf(sopt, &rulenum, 1163 sizeof(int), sizeof(int)); 1164 if (error) { 1165 break; 1166 } 1167 } 1168 error = ip_fw3_ctl_zero_entry(rulenum, 1169 sopt->sopt_name == IP_FW_RESETLOG); 1170 break; 1171 default: 1172 kprintf("ip_fw3_ctl invalid option %d\n", 1173 sopt->sopt_name); 1174 error = EINVAL; 1175 } 1176 return error; 1177 } 1178 1179 int 1180 ip_fw3_check_in(void *arg, struct mbuf **m0, struct ifnet *ifp, int dir) 1181 { 1182 struct ip_fw_args args; 1183 struct mbuf *m = *m0; 1184 struct m_tag *mtag; 1185 int tee = 0, error = 0, ret; 1186 // again: 1187 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 1188 /* Extract info from dummynet tag */ 1189 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 1190 KKASSERT(mtag != NULL); 1191 args.rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 1192 KKASSERT(args.rule != NULL); 1193 1194 m_tag_delete(m, mtag); 1195 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 1196 } else { 1197 args.rule = NULL; 1198 } 1199 1200 args.eh = NULL; 1201 args.oif = NULL; 1202 args.m = m; 1203 ret = ip_fw3_chk(&args); 1204 m = args.m; 1205 1206 if (m == NULL) { 1207 error = EACCES; 1208 goto back; 1209 } 1210 switch (ret) { 1211 case IP_FW_PASS: 1212 break; 1213 1214 case IP_FW_DENY: 1215 m_freem(m); 1216 m = NULL; 1217 error = EACCES; 1218 break; 1219 1220 case IP_FW_DUMMYNET: 1221 /* Send packet to the appropriate pipe */ 1222 m = ip_fw3_dummynet_io(m, args.cookie, DN_TO_IP_IN, 1223 &args); 1224 break; 1225 case IP_FW_TEE: 1226 tee = 1; 1227 /* FALL THROUGH */ 1228 case IP_FW_DIVERT: 1229 /* 1230 * Must clear bridge tag when changing 1231 */ 1232 m->m_pkthdr.fw_flags &= ~BRIDGE_MBUF_TAGGED; 1233 if (ip_divert_p != NULL) { 1234 m = ip_divert_p(m, tee, 1); 1235 } else { 1236 m_freem(m); 1237 m = NULL; 1238 /* not sure this is the right error msg */ 1239 error = EACCES; 1240 } 1241 break; 1242 case IP_FW_NAT: 1243 break; 1244 case IP_FW_ROUTE: 1245 break; 1246 default: 1247 panic("unknown ipfw3 return value: %d", ret); 1248 } 1249 back: 1250 *m0 = m; 1251 return error; 1252 } 1253 1254 int 1255 ip_fw3_check_out(void *arg, struct mbuf **m0, struct ifnet *ifp, int dir) 1256 { 1257 struct ip_fw_args args; 1258 struct mbuf *m = *m0; 1259 struct m_tag *mtag; 1260 int tee = 0, error = 0, ret; 1261 // again: 1262 if (m->m_pkthdr.fw_flags & DUMMYNET_MBUF_TAGGED) { 1263 /* Extract info from dummynet tag */ 1264 mtag = m_tag_find(m, PACKET_TAG_DUMMYNET, NULL); 1265 KKASSERT(mtag != NULL); 1266 args.rule = ((struct dn_pkt *)m_tag_data(mtag))->dn_priv; 1267 KKASSERT(args.rule != NULL); 1268 1269 m_tag_delete(m, mtag); 1270 m->m_pkthdr.fw_flags &= ~DUMMYNET_MBUF_TAGGED; 1271 } else { 1272 args.rule = NULL; 1273 } 1274 1275 args.eh = NULL; 1276 args.m = m; 1277 args.oif = ifp; 1278 ret = ip_fw3_chk(&args); 1279 m = args.m; 1280 1281 if (m == NULL) { 1282 error = EACCES; 1283 goto back; 1284 } 1285 1286 switch (ret) { 1287 case IP_FW_PASS: 1288 break; 1289 1290 case IP_FW_DENY: 1291 m_freem(m); 1292 m = NULL; 1293 error = EACCES; 1294 break; 1295 1296 case IP_FW_DUMMYNET: 1297 m = ip_fw3_dummynet_io(m, args.cookie, DN_TO_IP_OUT, 1298 &args); 1299 break; 1300 1301 case IP_FW_TEE: 1302 tee = 1; 1303 /* FALL THROUGH */ 1304 1305 case IP_FW_DIVERT: 1306 if (ip_divert_p != NULL) { 1307 m = ip_divert_p(m, tee, 0); 1308 } else { 1309 m_freem(m); 1310 m = NULL; 1311 /* not sure this is the right error msg */ 1312 error = EACCES; 1313 } 1314 break; 1315 1316 case IP_FW_NAT: 1317 break; 1318 case IP_FW_ROUTE: 1319 break; 1320 default: 1321 panic("unknown ipfw3 return value: %d", ret); 1322 } 1323 back: 1324 *m0 = m; 1325 return error; 1326 } 1327 1328 void 1329 ip_fw3_hook(void) 1330 { 1331 struct pfil_head *pfh; 1332 IPFW_ASSERT_CFGPORT(&curthread->td_msgport); 1333 1334 pfh = pfil_head_get(PFIL_TYPE_AF, AF_INET); 1335 if (pfh == NULL) 1336 return; 1337 1338 pfil_add_hook(ip_fw3_check_in, NULL, PFIL_IN, pfh); 1339 pfil_add_hook(ip_fw3_check_out, NULL, PFIL_OUT, pfh); 1340 } 1341 1342 void 1343 ip_fw3_dehook(void) 1344 { 1345 struct pfil_head *pfh; 1346 1347 IPFW_ASSERT_CFGPORT(&curthread->td_msgport); 1348 1349 pfh = pfil_head_get(PFIL_TYPE_AF, AF_INET); 1350 if (pfh == NULL) 1351 return; 1352 1353 pfil_remove_hook(ip_fw3_check_in, NULL, PFIL_IN, pfh); 1354 pfil_remove_hook(ip_fw3_check_out, NULL, PFIL_OUT, pfh); 1355 } 1356 1357 void 1358 ip_fw3_sysctl_enable_dispatch(netmsg_t nmsg) 1359 { 1360 struct lwkt_msg *lmsg = &nmsg->lmsg; 1361 int enable = lmsg->u.ms_result; 1362 1363 if (sysctl_var_fw3_enable == enable) 1364 goto reply; 1365 1366 sysctl_var_fw3_enable = enable; 1367 if (sysctl_var_fw3_enable) 1368 ip_fw3_hook(); 1369 else 1370 ip_fw3_dehook(); 1371 1372 reply: 1373 lwkt_replymsg(lmsg, 0); 1374 } 1375 1376 int 1377 ip_fw3_sysctl_enable(SYSCTL_HANDLER_ARGS) 1378 { 1379 struct netmsg_base nmsg; 1380 struct lwkt_msg *lmsg; 1381 int enable, error; 1382 1383 enable = sysctl_var_fw3_enable; 1384 error = sysctl_handle_int(oidp, &enable, 0, req); 1385 if (error || req->newptr == NULL) 1386 return error; 1387 1388 netmsg_init(&nmsg, NULL, &curthread->td_msgport, 1389 0, ip_fw3_sysctl_enable_dispatch); 1390 lmsg = &nmsg.lmsg; 1391 lmsg->u.ms_result = enable; 1392 1393 return lwkt_domsg(IPFW_CFGPORT, lmsg, 0); 1394 } 1395 1396 int 1397 ip_fw3_sysctl_autoinc_step(SYSCTL_HANDLER_ARGS) 1398 { 1399 return sysctl_int_range(oidp, arg1, arg2, req, 1400 IPFW_AUTOINC_STEP_MIN, IPFW_AUTOINC_STEP_MAX); 1401 } 1402 1403 void 1404 ctx_init_dispatch(netmsg_t nmsg) 1405 { 1406 struct netmsg_ipfw *fwmsg = (struct netmsg_ipfw *)nmsg; 1407 struct ipfw3_context *ctx; 1408 struct ip_fw *def_rule; 1409 1410 ctx = kmalloc(LEN_FW3_CTX, M_IPFW3, M_WAITOK | M_ZERO); 1411 fw3_ctx[mycpuid] = ctx; 1412 ctx->sets = IPFW_ALL_SETS; 1413 1414 def_rule = kmalloc(LEN_FW3, M_IPFW3, M_WAITOK | M_ZERO); 1415 def_rule->act_ofs = 0; 1416 def_rule->rulenum = IPFW_DEFAULT_RULE; 1417 def_rule->cmd_len = 2; 1418 def_rule->set = IPFW_DEFAULT_SET; 1419 1420 def_rule->cmd[0].len = LEN_OF_IPFWINSN; 1421 def_rule->cmd[0].module = MODULE_BASIC_ID; 1422 #ifdef IPFIREWALL_DEFAULT_TO_ACCEPT 1423 def_rule->cmd[0].opcode = O_BASIC_ACCEPT; 1424 #else 1425 if (filters_default_to_accept) 1426 def_rule->cmd[0].opcode = O_BASIC_ACCEPT; 1427 else 1428 def_rule->cmd[0].opcode = O_BASIC_DENY; 1429 #endif 1430 1431 /* Install the default rule */ 1432 ctx->default_rule = def_rule; 1433 ctx->rules = def_rule; 1434 1435 /* 1436 * if sibiling in last CPU is exists, 1437 * then it's sibling should be current rule 1438 */ 1439 if (fwmsg->sibling != NULL) { 1440 fwmsg->sibling->sibling = def_rule; 1441 } 1442 /* prepare for next CPU */ 1443 fwmsg->sibling = def_rule; 1444 1445 netisr_forwardmsg_all(&nmsg->base, mycpuid + 1); 1446 } 1447 1448 void 1449 init_dispatch(netmsg_t nmsg) 1450 { 1451 struct netmsg_ipfw fwmsg; 1452 int error = 0; 1453 if (IPFW3_LOADED) { 1454 kprintf("ipfw3 already loaded\n"); 1455 error = EEXIST; 1456 goto reply; 1457 } 1458 1459 bzero(&fwmsg, sizeof(fwmsg)); 1460 netmsg_init(&fwmsg.base, NULL, &curthread->td_msgport, 1461 0, ctx_init_dispatch); 1462 netisr_domsg(&fwmsg.base, 0); 1463 1464 ip_fw_chk_ptr = ip_fw3_chk; 1465 ip_fw_ctl_x_ptr = ip_fw3_ctl_x; 1466 ip_fw_dn_io_ptr = ip_fw3_dummynet_io; 1467 1468 kprintf("ipfw3 initialized, default to %s\n", 1469 filters_default_to_accept ? "accept" : "deny"); 1470 1471 ip_fw3_loaded = 1; 1472 if (sysctl_var_fw3_enable) 1473 ip_fw3_hook(); 1474 reply: 1475 lwkt_replymsg(&nmsg->lmsg, error); 1476 } 1477 1478 int 1479 ip_fw3_init(void) 1480 { 1481 struct netmsg_base smsg; 1482 int error; 1483 1484 init_module(); 1485 netmsg_init(&smsg, NULL, &curthread->td_msgport, 1486 0, init_dispatch); 1487 error = lwkt_domsg(IPFW_CFGPORT, &smsg.lmsg, 0); 1488 return error; 1489 } 1490 1491 #ifdef KLD_MODULE 1492 1493 void 1494 fini_dispatch(netmsg_t nmsg) 1495 { 1496 int error = 0, cpu; 1497 1498 ip_fw3_loaded = 0; 1499 1500 ip_fw3_dehook(); 1501 netmsg_service_sync(); 1502 ip_fw_chk_ptr = NULL; 1503 ip_fw_ctl_x_ptr = NULL; 1504 ip_fw_dn_io_ptr = NULL; 1505 ip_fw3_ctl_flush_rule(1); 1506 /* Free pre-cpu context */ 1507 for (cpu = 0; cpu < ncpus; ++cpu) { 1508 if (fw3_ctx[cpu] != NULL) { 1509 kfree(fw3_ctx[cpu], M_IPFW3); 1510 fw3_ctx[cpu] = NULL; 1511 } 1512 } 1513 kprintf("ipfw3 unloaded\n"); 1514 1515 lwkt_replymsg(&nmsg->lmsg, error); 1516 } 1517 1518 int 1519 ip_fw3_fini(void) 1520 { 1521 struct netmsg_base smsg; 1522 1523 netmsg_init(&smsg, NULL, &curthread->td_msgport, 1524 0, fini_dispatch); 1525 return lwkt_domsg(IPFW_CFGPORT, &smsg.lmsg, 0); 1526 } 1527 1528 #endif /* KLD_MODULE */ 1529 1530 static int 1531 ip_fw3_modevent(module_t mod, int type, void *unused) 1532 { 1533 int err = 0; 1534 1535 switch (type) { 1536 case MOD_LOAD: 1537 err = ip_fw3_init(); 1538 break; 1539 1540 case MOD_UNLOAD: 1541 1542 #ifndef KLD_MODULE 1543 kprintf("ipfw3 statically compiled, cannot unload\n"); 1544 err = EBUSY; 1545 #else 1546 err = ip_fw3_fini(); 1547 #endif 1548 break; 1549 default: 1550 break; 1551 } 1552 return err; 1553 } 1554 1555 static moduledata_t ipfw3mod = { 1556 "ipfw3", 1557 ip_fw3_modevent, 1558 0 1559 }; 1560 /* ipfw3 must init before ipfw3_basic */ 1561 DECLARE_MODULE(ipfw3, ipfw3mod, SI_SUB_PROTO_END, SI_ORDER_FIRST); 1562 MODULE_VERSION(ipfw3, 1); 1563