ip_fil_freebsd.c revision 153876
1145516Sdarrenr/* $FreeBSD: head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c 153876 2005-12-30 11:32:23Z guido $ */ 2145516Sdarrenr 3145516Sdarrenr/* 4145516Sdarrenr * Copyright (C) 1993-2003 by Darren Reed. 5145516Sdarrenr * 6145516Sdarrenr * See the IPFILTER.LICENCE file for details on licencing. 7145516Sdarrenr */ 8145516Sdarrenr#if !defined(lint) 9145516Sdarrenrstatic const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-2000 Darren Reed"; 10153876Sguidostatic const char rcsid[] = "@(#)$Id: ip_fil_freebsd.c,v 2.53.2.27 2005/08/20 13:48:19 darrenr Exp $"; 11145516Sdarrenr#endif 12145516Sdarrenr 13145516Sdarrenr#if defined(KERNEL) || defined(_KERNEL) 14145516Sdarrenr# undef KERNEL 15145516Sdarrenr# undef _KERNEL 16145516Sdarrenr# define KERNEL 1 17145516Sdarrenr# define _KERNEL 1 18145516Sdarrenr#endif 19145516Sdarrenr#if defined(__FreeBSD_version) && (__FreeBSD_version >= 400000) && \ 20145516Sdarrenr !defined(KLD_MODULE) && !defined(IPFILTER_LKM) 21145516Sdarrenr# include "opt_inet6.h" 22145516Sdarrenr#endif 23145516Sdarrenr#if defined(__FreeBSD_version) && (__FreeBSD_version >= 440000) && \ 24145516Sdarrenr !defined(KLD_MODULE) && !defined(IPFILTER_LKM) 25145516Sdarrenr# include "opt_random_ip_id.h" 26145516Sdarrenr#endif 27145516Sdarrenr#include <sys/param.h> 28145516Sdarrenr#if defined(__FreeBSD__) && !defined(__FreeBSD_version) 29145516Sdarrenr# if defined(IPFILTER_LKM) 30145516Sdarrenr# ifndef __FreeBSD_cc_version 31145516Sdarrenr# include <osreldate.h> 32145516Sdarrenr# else 33145516Sdarrenr# if __FreeBSD_cc_version < 430000 34145516Sdarrenr# include <osreldate.h> 35145516Sdarrenr# endif 36145516Sdarrenr# endif 37145516Sdarrenr# endif 38145516Sdarrenr#endif 39145516Sdarrenr#include <sys/errno.h> 40145516Sdarrenr#include <sys/types.h> 41145516Sdarrenr#include <sys/file.h> 42145516Sdarrenr#if __FreeBSD_version >= 220000 43145516Sdarrenr# include <sys/fcntl.h> 44145516Sdarrenr# include <sys/filio.h> 45145516Sdarrenr#else 46145516Sdarrenr# include <sys/ioctl.h> 47145516Sdarrenr#endif 48145516Sdarrenr#include <sys/time.h> 49145516Sdarrenr#include <sys/systm.h> 50145516Sdarrenr#if (__FreeBSD_version >= 300000) 51145516Sdarrenr# include <sys/dirent.h> 52145516Sdarrenr#else 53145516Sdarrenr# include <sys/dir.h> 54145516Sdarrenr#endif 55145516Sdarrenr#if !defined(__hpux) 56145516Sdarrenr# include <sys/mbuf.h> 57145516Sdarrenr#endif 58145516Sdarrenr#include <sys/protosw.h> 59145516Sdarrenr#include <sys/socket.h> 60145516Sdarrenr 61145516Sdarrenr#include <net/if.h> 62145516Sdarrenr#if __FreeBSD_version >= 300000 63145516Sdarrenr# include <net/if_var.h> 64145516Sdarrenr# if !defined(IPFILTER_LKM) 65145516Sdarrenr# include "opt_ipfilter.h" 66145516Sdarrenr# endif 67145516Sdarrenr#endif 68145516Sdarrenr#include <net/route.h> 69145516Sdarrenr#include <netinet/in.h> 70145516Sdarrenr#include <netinet/in_var.h> 71145516Sdarrenr#include <netinet/in_systm.h> 72145516Sdarrenr#include <netinet/ip.h> 73145516Sdarrenr#include <netinet/ip_var.h> 74145516Sdarrenr#include <netinet/tcp.h> 75145516Sdarrenr#if defined(__osf__) 76145516Sdarrenr# include <netinet/tcp_timer.h> 77145516Sdarrenr#endif 78145516Sdarrenr#include <netinet/udp.h> 79145516Sdarrenr#include <netinet/tcpip.h> 80145516Sdarrenr#include <netinet/ip_icmp.h> 81145516Sdarrenr#ifndef _KERNEL 82145516Sdarrenr# include "netinet/ipf.h" 83145516Sdarrenr#endif 84145516Sdarrenr#include "netinet/ip_compat.h" 85145516Sdarrenr#ifdef USE_INET6 86145516Sdarrenr# include <netinet/icmp6.h> 87145516Sdarrenr#endif 88145516Sdarrenr#include "netinet/ip_fil.h" 89145516Sdarrenr#include "netinet/ip_nat.h" 90145516Sdarrenr#include "netinet/ip_frag.h" 91145516Sdarrenr#include "netinet/ip_state.h" 92145516Sdarrenr#include "netinet/ip_proxy.h" 93145516Sdarrenr#include "netinet/ip_auth.h" 94145516Sdarrenr#ifdef IPFILTER_SYNC 95145516Sdarrenr#include "netinet/ip_sync.h" 96145516Sdarrenr#endif 97145516Sdarrenr#ifdef IPFILTER_SCAN 98145516Sdarrenr#include "netinet/ip_scan.h" 99145516Sdarrenr#endif 100145516Sdarrenr#include "netinet/ip_pool.h" 101145516Sdarrenr#if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000) 102145516Sdarrenr# include <sys/malloc.h> 103145516Sdarrenr#endif 104145516Sdarrenr#include <sys/kernel.h> 105145516Sdarrenr#ifdef CSUM_DATA_VALID 106145516Sdarrenr#include <machine/in_cksum.h> 107145516Sdarrenr#endif 108145516Sdarrenrextern int ip_optcopy __P((struct ip *, struct ip *)); 109145516Sdarrenr 110145516Sdarrenr#if (__FreeBSD_version > 460000) 111145516Sdarrenrextern int path_mtu_discovery; 112145516Sdarrenr#endif 113145516Sdarrenr 114145516Sdarrenr# ifdef IPFILTER_M_IPFILTER 115151897SrwatsonMALLOC_DEFINE(M_IPFILTER, "ipfilter", "IP Filter packet filter data structures"); 116145516Sdarrenr# endif 117145516Sdarrenr 118145516Sdarrenr 119145516Sdarrenr#if !defined(__osf__) 120145516Sdarrenrextern struct protosw inetsw[]; 121145516Sdarrenr#endif 122145516Sdarrenr 123145516Sdarrenrstatic int (*fr_savep) __P((ip_t *, int, void *, int, struct mbuf **)); 124145516Sdarrenrstatic int fr_send_ip __P((fr_info_t *, mb_t *, mb_t **)); 125145516Sdarrenr# ifdef USE_MUTEXES 126145516Sdarrenripfmutex_t ipl_mutex, ipf_authmx, ipf_rw, ipf_stinsert; 127145516Sdarrenripfmutex_t ipf_nat_new, ipf_natio, ipf_timeoutlock; 128153876Sguidoipfrwlock_t ipf_mutex, ipf_global, ipf_ipidfrag, ipf_frcache; 129145516Sdarrenripfrwlock_t ipf_frag, ipf_state, ipf_nat, ipf_natfrag, ipf_auth; 130145516Sdarrenr# endif 131145516Sdarrenrint ipf_locks_done = 0; 132145516Sdarrenr 133145516Sdarrenr#if (__FreeBSD_version >= 300000) 134145516Sdarrenrstruct callout_handle fr_slowtimer_ch; 135145516Sdarrenr#endif 136145516Sdarrenr 137145516Sdarrenr#if (__FreeBSD_version >= 500011) 138145516Sdarrenr# include <sys/conf.h> 139145516Sdarrenr# if defined(NETBSD_PF) 140145516Sdarrenr# include <net/pfil.h> 141145516Sdarrenr# include <netinet/ipprotosw.h> 142145516Sdarrenr/* 143145516Sdarrenr * We provide the fr_checkp name just to minimize changes later. 144145516Sdarrenr */ 145145516Sdarrenrint (*fr_checkp) __P((ip_t *ip, int hlen, void *ifp, int out, mb_t **mp)); 146145516Sdarrenr# endif /* NETBSD_PF */ 147145516Sdarrenr#endif /* __FreeBSD_version >= 500011 */ 148145516Sdarrenr 149145516Sdarrenr 150153876Sguido#if (__FreeBSD_version >= 502103) 151153876Sguidostatic eventhandler_tag ipf_arrivetag, ipf_departtag, ipf_clonetag; 152153876Sguido 153153876Sguidostatic void ipf_ifevent(void *arg); 154153876Sguido 155153876Sguidostatic void ipf_ifevent(arg) 156153876Sguidovoid *arg; 157153876Sguido{ 158153876Sguido frsync(NULL); 159153876Sguido} 160153876Sguido#endif 161153876Sguido 162153876Sguido 163145516Sdarrenr#if (__FreeBSD_version >= 501108) && defined(_KERNEL) 164145516Sdarrenr 165145516Sdarrenrstatic int 166145516Sdarrenrfr_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 167145516Sdarrenr{ 168145516Sdarrenr struct ip *ip = mtod(*mp, struct ip *); 169145516Sdarrenr return fr_check(ip, ip->ip_hl << 2, ifp, (dir == PFIL_OUT), mp); 170145516Sdarrenr} 171145516Sdarrenr 172145516Sdarrenr# ifdef USE_INET6 173145516Sdarrenr# include <netinet/ip6.h> 174145516Sdarrenr 175145516Sdarrenrstatic int 176145516Sdarrenrfr_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 177145516Sdarrenr{ 178145516Sdarrenr return (fr_check(mtod(*mp, struct ip *), sizeof(struct ip6_hdr), 179145516Sdarrenr ifp, (dir == PFIL_OUT), mp)); 180145516Sdarrenr} 181145516Sdarrenr# endif 182145516Sdarrenr#endif /* __FreeBSD_version >= 501108 */ 183145516Sdarrenr#if defined(IPFILTER_LKM) 184145516Sdarrenrint iplidentify(s) 185145516Sdarrenrchar *s; 186145516Sdarrenr{ 187145516Sdarrenr if (strcmp(s, "ipl") == 0) 188145516Sdarrenr return 1; 189145516Sdarrenr return 0; 190145516Sdarrenr} 191145516Sdarrenr#endif /* IPFILTER_LKM */ 192145516Sdarrenr 193145516Sdarrenr 194145516Sdarrenrint iplattach() 195145516Sdarrenr{ 196145516Sdarrenr#ifdef USE_SPL 197145516Sdarrenr int s; 198145516Sdarrenr#endif 199145516Sdarrenr#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011) 200145516Sdarrenr int error = 0; 201145516Sdarrenr# if __FreeBSD_version >= 501108 202145516Sdarrenr struct pfil_head *ph_inet; 203145516Sdarrenr# ifdef USE_INET6 204145516Sdarrenr struct pfil_head *ph_inet6; 205145516Sdarrenr# endif 206145516Sdarrenr# endif 207145516Sdarrenr#endif 208145516Sdarrenr 209145516Sdarrenr SPL_NET(s); 210145516Sdarrenr if (fr_running > 0) { 211145516Sdarrenr SPL_X(s); 212145516Sdarrenr return EBUSY; 213145516Sdarrenr } 214145516Sdarrenr 215145516Sdarrenr MUTEX_INIT(&ipf_rw, "ipf rw mutex"); 216145516Sdarrenr RWLOCK_INIT(&ipf_global, "ipf filter load/unload mutex"); 217145516Sdarrenr MUTEX_INIT(&ipf_timeoutlock, "ipf timeout queue mutex"); 218145516Sdarrenr RWLOCK_INIT(&ipf_mutex, "ipf filter rwlock"); 219153876Sguido RWLOCK_INIT(&ipf_frcache, "ipf cache rwlock"); 220145516Sdarrenr RWLOCK_INIT(&ipf_ipidfrag, "ipf IP NAT-Frag rwlock"); 221145516Sdarrenr ipf_locks_done = 1; 222145516Sdarrenr 223145516Sdarrenr if (fr_initialise() < 0) { 224145516Sdarrenr SPL_X(s); 225145516Sdarrenr return EIO; 226145516Sdarrenr } 227145516Sdarrenr 228145516Sdarrenr 229145516Sdarrenr# ifdef NETBSD_PF 230145516Sdarrenr# if __FreeBSD_version >= 500011 231145516Sdarrenr# if __FreeBSD_version >= 501108 232145516Sdarrenr ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); 233145516Sdarrenr# ifdef USE_INET6 234145516Sdarrenr ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); 235145516Sdarrenr# endif 236145516Sdarrenr if (ph_inet == NULL 237145516Sdarrenr# ifdef USE_INET6 238145516Sdarrenr && ph_inet6 == NULL 239145516Sdarrenr# endif 240145516Sdarrenr ) 241145516Sdarrenr return ENODEV; 242145516Sdarrenr 243145516Sdarrenr if (ph_inet != NULL) 244145516Sdarrenr error = pfil_add_hook((void *)fr_check_wrapper, NULL, 245145516Sdarrenr PFIL_IN|PFIL_OUT, ph_inet); 246145516Sdarrenr else 247145516Sdarrenr error = 0; 248145516Sdarrenr# else 249145516Sdarrenr error = pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT, 250145516Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 251145516Sdarrenr# endif 252145516Sdarrenr if (error) { 253145516Sdarrenr# ifdef USE_INET6 254145516Sdarrenr goto pfil_error; 255145516Sdarrenr# else 256145516Sdarrenr fr_deinitialise(); 257145516Sdarrenr SPL_X(s); 258145516Sdarrenr return error; 259145516Sdarrenr# endif 260145516Sdarrenr } 261145516Sdarrenr# else 262145516Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT); 263145516Sdarrenr# endif 264145516Sdarrenr# ifdef USE_INET6 265145516Sdarrenr# if __FreeBSD_version >= 501108 266145516Sdarrenr if (ph_inet6 != NULL) 267145516Sdarrenr error = pfil_add_hook((void *)fr_check_wrapper6, NULL, 268145516Sdarrenr PFIL_IN|PFIL_OUT, ph_inet6); 269145516Sdarrenr else 270145516Sdarrenr error = 0; 271145516Sdarrenr if (error) { 272145516Sdarrenr pfil_remove_hook((void *)fr_check_wrapper6, NULL, 273145516Sdarrenr PFIL_IN|PFIL_OUT, ph_inet6); 274145516Sdarrenr# else 275145516Sdarrenr error = pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT, 276145516Sdarrenr &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 277145516Sdarrenr if (error) { 278145516Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT, 279145516Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 280145516Sdarrenr# endif 281145516Sdarrenrpfil_error: 282145516Sdarrenr fr_deinitialise(); 283145516Sdarrenr SPL_X(s); 284145516Sdarrenr return error; 285145516Sdarrenr } 286145516Sdarrenr# endif 287145516Sdarrenr# endif 288153876Sguido 289153876Sguido#if (__FreeBSD_version >= 502103) 290153876Sguido ipf_arrivetag = EVENTHANDLER_REGISTER(ifnet_arrival_event, \ 291153876Sguido ipf_ifevent, NULL, \ 292153876Sguido EVENTHANDLER_PRI_ANY); 293153876Sguido ipf_departtag = EVENTHANDLER_REGISTER(ifnet_departure_event, \ 294153876Sguido ipf_ifevent, NULL, \ 295153876Sguido EVENTHANDLER_PRI_ANY); 296153876Sguido ipf_clonetag = EVENTHANDLER_REGISTER(if_clone_event, ipf_ifevent, \ 297153876Sguido NULL, EVENTHANDLER_PRI_ANY); 298153876Sguido#endif 299153876Sguido 300145516Sdarrenr if (fr_checkp != fr_check) { 301145516Sdarrenr fr_savep = fr_checkp; 302145516Sdarrenr fr_checkp = fr_check; 303145516Sdarrenr } 304145516Sdarrenr 305145516Sdarrenr bzero((char *)frcache, sizeof(frcache)); 306145516Sdarrenr fr_running = 1; 307145516Sdarrenr 308145516Sdarrenr if (fr_control_forwarding & 1) 309145516Sdarrenr ipforwarding = 1; 310145516Sdarrenr 311145516Sdarrenr SPL_X(s); 312145516Sdarrenr#if (__FreeBSD_version >= 300000) 313145516Sdarrenr fr_slowtimer_ch = timeout(fr_slowtimer, NULL, 314145516Sdarrenr (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 315145516Sdarrenr#else 316145516Sdarrenr timeout(fr_slowtimer, NULL, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 317145516Sdarrenr#endif 318145516Sdarrenr return 0; 319145516Sdarrenr} 320145516Sdarrenr 321145516Sdarrenr 322145516Sdarrenr/* 323145516Sdarrenr * Disable the filter by removing the hooks from the IP input/output 324145516Sdarrenr * stream. 325145516Sdarrenr */ 326145516Sdarrenrint ipldetach() 327145516Sdarrenr{ 328145516Sdarrenr#ifdef USE_SPL 329145516Sdarrenr int s; 330145516Sdarrenr#endif 331145516Sdarrenr#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011) 332145516Sdarrenr int error = 0; 333145516Sdarrenr# if __FreeBSD_version >= 501108 334145516Sdarrenr struct pfil_head *ph_inet; 335145516Sdarrenr# ifdef USE_INET6 336145516Sdarrenr struct pfil_head *ph_inet6; 337145516Sdarrenr# endif 338145516Sdarrenr# endif 339145516Sdarrenr#endif 340145516Sdarrenr 341145516Sdarrenr if (fr_control_forwarding & 2) 342145516Sdarrenr ipforwarding = 0; 343145516Sdarrenr 344153876Sguido#if (__FreeBSD_version >= 502103) 345153876Sguido if (ipf_arrivetag != NULL) { 346153876Sguido EVENTHANDLER_DEREGISTER(ifnet_arrival_event, ipf_arrivetag); 347153876Sguido } 348153876Sguido if (ipf_departtag != NULL) { 349153876Sguido EVENTHANDLER_DEREGISTER(ifnet_departure_event, ipf_departtag); 350153876Sguido } 351153876Sguido if (ipf_clonetag != NULL) { 352153876Sguido EVENTHANDLER_DEREGISTER(if_clone_event, ipf_clonetag); 353153876Sguido } 354153876Sguido#endif 355153876Sguido 356145516Sdarrenr SPL_NET(s); 357145516Sdarrenr 358145516Sdarrenr#if (__FreeBSD_version >= 300000) 359145516Sdarrenr if (fr_slowtimer_ch.callout != NULL) 360145516Sdarrenr untimeout(fr_slowtimer, NULL, fr_slowtimer_ch); 361145516Sdarrenr bzero(&fr_slowtimer_ch, sizeof(fr_slowtimer_ch)); 362145516Sdarrenr#else 363145516Sdarrenr untimeout(fr_slowtimer, NULL); 364145516Sdarrenr#endif /* FreeBSD */ 365145516Sdarrenr 366145516Sdarrenr#ifndef NETBSD_PF 367145516Sdarrenr if (fr_checkp != NULL) 368145516Sdarrenr fr_checkp = fr_savep; 369145516Sdarrenr fr_savep = NULL; 370145516Sdarrenr#endif 371145516Sdarrenr 372145516Sdarrenr#ifdef NETBSD_PF 373145516Sdarrenr# if (__FreeBSD_version >= 500011) 374145516Sdarrenr# if (__FreeBSD_version >= 501108) 375145516Sdarrenr ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); 376145516Sdarrenr if (ph_inet != NULL) 377145516Sdarrenr error = pfil_remove_hook((void *)fr_check_wrapper, NULL, 378145516Sdarrenr PFIL_IN|PFIL_OUT, ph_inet); 379145516Sdarrenr else 380145516Sdarrenr error = 0; 381145516Sdarrenr# else 382145516Sdarrenr error = pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT, 383145516Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 384145516Sdarrenr# endif 385145516Sdarrenr if (error) { 386145516Sdarrenr SPL_X(s); 387145516Sdarrenr return error; 388145516Sdarrenr } 389145516Sdarrenr# else 390145516Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT); 391145516Sdarrenr# endif 392145516Sdarrenr# ifdef USE_INET6 393145516Sdarrenr# if (__FreeBSD_version >= 501108) 394145516Sdarrenr ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); 395145516Sdarrenr if (ph_inet6 != NULL) 396145516Sdarrenr error = pfil_remove_hook((void *)fr_check_wrapper6, NULL, 397145516Sdarrenr PFIL_IN|PFIL_OUT, ph_inet6); 398145516Sdarrenr else 399145516Sdarrenr error = 0; 400145516Sdarrenr# else 401145516Sdarrenr error = pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT, 402145516Sdarrenr &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 403145516Sdarrenr# endif 404145516Sdarrenr if (error) { 405145516Sdarrenr SPL_X(s); 406145516Sdarrenr return error; 407145516Sdarrenr } 408145516Sdarrenr# endif 409145516Sdarrenr#endif 410145516Sdarrenr fr_deinitialise(); 411145516Sdarrenr 412145516Sdarrenr fr_running = -2; 413145516Sdarrenr 414145516Sdarrenr (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE); 415145516Sdarrenr (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE); 416145516Sdarrenr 417145516Sdarrenr if (ipf_locks_done == 1) { 418145516Sdarrenr MUTEX_DESTROY(&ipf_timeoutlock); 419145516Sdarrenr MUTEX_DESTROY(&ipf_rw); 420145516Sdarrenr RW_DESTROY(&ipf_mutex); 421153876Sguido RW_DESTROY(&ipf_frcache); 422145516Sdarrenr RW_DESTROY(&ipf_ipidfrag); 423145516Sdarrenr RW_DESTROY(&ipf_global); 424145516Sdarrenr ipf_locks_done = 0; 425145516Sdarrenr } 426145516Sdarrenr 427145516Sdarrenr SPL_X(s); 428145516Sdarrenr 429145516Sdarrenr return 0; 430145516Sdarrenr} 431145516Sdarrenr 432145516Sdarrenr 433145516Sdarrenr/* 434145516Sdarrenr * Filter ioctl interface. 435145516Sdarrenr */ 436145516Sdarrenrint iplioctl(dev, cmd, data, mode 437145516Sdarrenr# if defined(_KERNEL) && ((BSD >= 199506) || (__FreeBSD_version >= 220000)) 438145516Sdarrenr, p) 439145516Sdarrenr# if (__FreeBSD_version >= 500024) 440145516Sdarrenrstruct thread *p; 441145516Sdarrenr# else 442145516Sdarrenrstruct proc *p; 443145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 444145516Sdarrenr# else 445145516Sdarrenr) 446145516Sdarrenr# endif 447145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 448145516Sdarrenrstruct cdev *dev; 449145516Sdarrenr#else 450145516Sdarrenrdev_t dev; 451145516Sdarrenr#endif 452145516Sdarrenrioctlcmd_t cmd; 453145516Sdarrenrcaddr_t data; 454145516Sdarrenrint mode; 455145516Sdarrenr{ 456145516Sdarrenr#ifdef USE_SPL 457145516Sdarrenr int s; 458145516Sdarrenr#endif 459145516Sdarrenr int error = 0, unit = 0, tmp; 460145516Sdarrenr friostat_t fio; 461145516Sdarrenr 462145516Sdarrenr#if (BSD >= 199306) && defined(_KERNEL) 463153876Sguido if ((securelevel >= 3) && (mode & FWRITE)) 464145516Sdarrenr return EPERM; 465145516Sdarrenr#endif 466145516Sdarrenr 467145516Sdarrenr unit = GET_MINOR(dev); 468145516Sdarrenr if ((IPL_LOGMAX < unit) || (unit < 0)) 469145516Sdarrenr return ENXIO; 470145516Sdarrenr 471145516Sdarrenr if (fr_running <= 0) { 472145516Sdarrenr if (unit != IPL_LOGIPF) 473145516Sdarrenr return EIO; 474145516Sdarrenr if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET && 475145516Sdarrenr cmd != SIOCIPFSET && cmd != SIOCFRENB && 476145516Sdarrenr cmd != SIOCGETFS && cmd != SIOCGETFF) 477145516Sdarrenr return EIO; 478145516Sdarrenr } 479145516Sdarrenr 480145516Sdarrenr SPL_NET(s); 481145516Sdarrenr 482145516Sdarrenr error = fr_ioctlswitch(unit, data, cmd, mode); 483145516Sdarrenr if (error != -1) { 484145516Sdarrenr SPL_X(s); 485145516Sdarrenr return error; 486145516Sdarrenr } 487145516Sdarrenr error = 0; 488145516Sdarrenr 489145516Sdarrenr switch (cmd) 490145516Sdarrenr { 491145516Sdarrenr case FIONREAD : 492145516Sdarrenr#ifdef IPFILTER_LOG 493145516Sdarrenr BCOPYOUT(&iplused[IPL_LOGIPF], (caddr_t)data, 494145516Sdarrenr sizeof(iplused[IPL_LOGIPF])); 495145516Sdarrenr#endif 496145516Sdarrenr break; 497145516Sdarrenr case SIOCFRENB : 498145516Sdarrenr if (!(mode & FWRITE)) 499145516Sdarrenr error = EPERM; 500145516Sdarrenr else { 501145516Sdarrenr BCOPYIN(data, &tmp, sizeof(tmp)); 502145516Sdarrenr if (tmp) { 503145516Sdarrenr if (fr_running > 0) 504145516Sdarrenr error = 0; 505145516Sdarrenr else 506145516Sdarrenr error = iplattach(); 507145516Sdarrenr if (error == 0) 508145516Sdarrenr fr_running = 1; 509145516Sdarrenr else 510145516Sdarrenr (void) ipldetach(); 511145516Sdarrenr } else { 512145516Sdarrenr error = ipldetach(); 513145516Sdarrenr if (error == 0) 514145516Sdarrenr fr_running = -1; 515145516Sdarrenr } 516145516Sdarrenr } 517145516Sdarrenr break; 518145516Sdarrenr case SIOCIPFSET : 519145516Sdarrenr if (!(mode & FWRITE)) { 520145516Sdarrenr error = EPERM; 521145516Sdarrenr break; 522145516Sdarrenr } 523145516Sdarrenr case SIOCIPFGETNEXT : 524145516Sdarrenr case SIOCIPFGET : 525145516Sdarrenr error = fr_ipftune(cmd, data); 526145516Sdarrenr break; 527145516Sdarrenr case SIOCSETFF : 528145516Sdarrenr if (!(mode & FWRITE)) 529145516Sdarrenr error = EPERM; 530145516Sdarrenr else 531145516Sdarrenr BCOPYIN(data, &fr_flags, sizeof(fr_flags)); 532145516Sdarrenr break; 533145516Sdarrenr case SIOCGETFF : 534145516Sdarrenr BCOPYOUT(&fr_flags, data, sizeof(fr_flags)); 535145516Sdarrenr break; 536145516Sdarrenr case SIOCFUNCL : 537145516Sdarrenr error = fr_resolvefunc(data); 538145516Sdarrenr break; 539145516Sdarrenr case SIOCINAFR : 540145516Sdarrenr case SIOCRMAFR : 541145516Sdarrenr case SIOCADAFR : 542145516Sdarrenr case SIOCZRLST : 543145516Sdarrenr if (!(mode & FWRITE)) 544145516Sdarrenr error = EPERM; 545145516Sdarrenr else 546145516Sdarrenr error = frrequest(unit, cmd, data, fr_active, 1); 547145516Sdarrenr break; 548145516Sdarrenr case SIOCINIFR : 549145516Sdarrenr case SIOCRMIFR : 550145516Sdarrenr case SIOCADIFR : 551145516Sdarrenr if (!(mode & FWRITE)) 552145516Sdarrenr error = EPERM; 553145516Sdarrenr else 554145516Sdarrenr error = frrequest(unit, cmd, data, 1 - fr_active, 1); 555145516Sdarrenr break; 556145516Sdarrenr case SIOCSWAPA : 557145516Sdarrenr if (!(mode & FWRITE)) 558145516Sdarrenr error = EPERM; 559145516Sdarrenr else { 560145516Sdarrenr bzero((char *)frcache, sizeof(frcache[0]) * 2); 561145516Sdarrenr *(u_int *)data = fr_active; 562145516Sdarrenr fr_active = 1 - fr_active; 563145516Sdarrenr } 564145516Sdarrenr break; 565145516Sdarrenr case SIOCGETFS : 566145516Sdarrenr fr_getstat(&fio); 567145516Sdarrenr error = fr_outobj(data, &fio, IPFOBJ_IPFSTAT); 568145516Sdarrenr break; 569145516Sdarrenr case SIOCFRZST : 570145516Sdarrenr if (!(mode & FWRITE)) 571145516Sdarrenr error = EPERM; 572145516Sdarrenr else 573145516Sdarrenr error = fr_zerostats(data); 574145516Sdarrenr break; 575145516Sdarrenr case SIOCIPFFL : 576145516Sdarrenr if (!(mode & FWRITE)) 577145516Sdarrenr error = EPERM; 578145516Sdarrenr else { 579145516Sdarrenr BCOPYIN(data, &tmp, sizeof(tmp)); 580145516Sdarrenr tmp = frflush(unit, 4, tmp); 581145516Sdarrenr BCOPYOUT(&tmp, data, sizeof(tmp)); 582145516Sdarrenr } 583145516Sdarrenr break; 584145516Sdarrenr#ifdef USE_INET6 585145516Sdarrenr case SIOCIPFL6 : 586145516Sdarrenr if (!(mode & FWRITE)) 587145516Sdarrenr error = EPERM; 588145516Sdarrenr else { 589145516Sdarrenr BCOPYIN(data, &tmp, sizeof(tmp)); 590145516Sdarrenr tmp = frflush(unit, 6, tmp); 591145516Sdarrenr BCOPYOUT(&tmp, data, sizeof(tmp)); 592145516Sdarrenr } 593145516Sdarrenr break; 594145516Sdarrenr#endif 595145516Sdarrenr case SIOCSTLCK : 596145516Sdarrenr BCOPYIN(data, &tmp, sizeof(tmp)); 597145516Sdarrenr fr_state_lock = tmp; 598145516Sdarrenr fr_nat_lock = tmp; 599145516Sdarrenr fr_frag_lock = tmp; 600145516Sdarrenr fr_auth_lock = tmp; 601145516Sdarrenr break; 602145516Sdarrenr#ifdef IPFILTER_LOG 603145516Sdarrenr case SIOCIPFFB : 604145516Sdarrenr if (!(mode & FWRITE)) 605145516Sdarrenr error = EPERM; 606145516Sdarrenr else 607145516Sdarrenr *(int *)data = ipflog_clear(unit); 608145516Sdarrenr break; 609145516Sdarrenr#endif /* IPFILTER_LOG */ 610145516Sdarrenr case SIOCGFRST : 611145516Sdarrenr error = fr_outobj(data, fr_fragstats(), IPFOBJ_FRAGSTAT); 612145516Sdarrenr break; 613145516Sdarrenr case SIOCFRSYN : 614145516Sdarrenr if (!(mode & FWRITE)) 615145516Sdarrenr error = EPERM; 616145516Sdarrenr else { 617145516Sdarrenr frsync(NULL); 618145516Sdarrenr } 619145516Sdarrenr break; 620145516Sdarrenr default : 621145516Sdarrenr error = EINVAL; 622145516Sdarrenr break; 623145516Sdarrenr } 624145516Sdarrenr SPL_X(s); 625145516Sdarrenr return error; 626145516Sdarrenr} 627145516Sdarrenr 628145516Sdarrenr 629145516Sdarrenr#if 0 630145516Sdarrenrvoid fr_forgetifp(ifp) 631145516Sdarrenrvoid *ifp; 632145516Sdarrenr{ 633145516Sdarrenr register frentry_t *f; 634145516Sdarrenr 635145516Sdarrenr WRITE_ENTER(&ipf_mutex); 636145516Sdarrenr for (f = ipacct[0][fr_active]; (f != NULL); f = f->fr_next) 637145516Sdarrenr if (f->fr_ifa == ifp) 638145516Sdarrenr f->fr_ifa = (void *)-1; 639145516Sdarrenr for (f = ipacct[1][fr_active]; (f != NULL); f = f->fr_next) 640145516Sdarrenr if (f->fr_ifa == ifp) 641145516Sdarrenr f->fr_ifa = (void *)-1; 642145516Sdarrenr for (f = ipfilter[0][fr_active]; (f != NULL); f = f->fr_next) 643145516Sdarrenr if (f->fr_ifa == ifp) 644145516Sdarrenr f->fr_ifa = (void *)-1; 645145516Sdarrenr for (f = ipfilter[1][fr_active]; (f != NULL); f = f->fr_next) 646145516Sdarrenr if (f->fr_ifa == ifp) 647145516Sdarrenr f->fr_ifa = (void *)-1; 648145516Sdarrenr#ifdef USE_INET6 649145516Sdarrenr for (f = ipacct6[0][fr_active]; (f != NULL); f = f->fr_next) 650145516Sdarrenr if (f->fr_ifa == ifp) 651145516Sdarrenr f->fr_ifa = (void *)-1; 652145516Sdarrenr for (f = ipacct6[1][fr_active]; (f != NULL); f = f->fr_next) 653145516Sdarrenr if (f->fr_ifa == ifp) 654145516Sdarrenr f->fr_ifa = (void *)-1; 655145516Sdarrenr for (f = ipfilter6[0][fr_active]; (f != NULL); f = f->fr_next) 656145516Sdarrenr if (f->fr_ifa == ifp) 657145516Sdarrenr f->fr_ifa = (void *)-1; 658145516Sdarrenr for (f = ipfilter6[1][fr_active]; (f != NULL); f = f->fr_next) 659145516Sdarrenr if (f->fr_ifa == ifp) 660145516Sdarrenr f->fr_ifa = (void *)-1; 661145516Sdarrenr#endif 662145516Sdarrenr RWLOCK_EXIT(&ipf_mutex); 663145516Sdarrenr fr_natsync(ifp); 664145516Sdarrenr} 665145516Sdarrenr#endif 666145516Sdarrenr 667145516Sdarrenr 668145516Sdarrenr/* 669145516Sdarrenr * routines below for saving IP headers to buffer 670145516Sdarrenr */ 671145516Sdarrenrint iplopen(dev, flags 672145516Sdarrenr#if ((BSD >= 199506) || (__FreeBSD_version >= 220000)) && defined(_KERNEL) 673145516Sdarrenr, devtype, p) 674145516Sdarrenrint devtype; 675145516Sdarrenr# if (__FreeBSD_version >= 500024) 676145516Sdarrenrstruct thread *p; 677145516Sdarrenr# else 678145516Sdarrenrstruct proc *p; 679145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 680145516Sdarrenr#else 681145516Sdarrenr) 682145516Sdarrenr#endif 683145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 684145516Sdarrenrstruct cdev *dev; 685145516Sdarrenr#else 686145516Sdarrenrdev_t dev; 687145516Sdarrenr#endif 688145516Sdarrenrint flags; 689145516Sdarrenr{ 690145516Sdarrenr u_int min = GET_MINOR(dev); 691145516Sdarrenr 692145516Sdarrenr if (IPL_LOGMAX < min) 693145516Sdarrenr min = ENXIO; 694145516Sdarrenr else 695145516Sdarrenr min = 0; 696145516Sdarrenr return min; 697145516Sdarrenr} 698145516Sdarrenr 699145516Sdarrenr 700145516Sdarrenrint iplclose(dev, flags 701145516Sdarrenr#if ((BSD >= 199506) || (__FreeBSD_version >= 220000)) && defined(_KERNEL) 702145516Sdarrenr, devtype, p) 703145516Sdarrenrint devtype; 704145516Sdarrenr# if (__FreeBSD_version >= 500024) 705145516Sdarrenrstruct thread *p; 706145516Sdarrenr# else 707145516Sdarrenrstruct proc *p; 708145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 709145516Sdarrenr#else 710145516Sdarrenr) 711145516Sdarrenr#endif 712145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 713145516Sdarrenrstruct cdev *dev; 714145516Sdarrenr#else 715145516Sdarrenrdev_t dev; 716145516Sdarrenr#endif 717145516Sdarrenrint flags; 718145516Sdarrenr{ 719145516Sdarrenr u_int min = GET_MINOR(dev); 720145516Sdarrenr 721145516Sdarrenr if (IPL_LOGMAX < min) 722145516Sdarrenr min = ENXIO; 723145516Sdarrenr else 724145516Sdarrenr min = 0; 725145516Sdarrenr return min; 726145516Sdarrenr} 727145516Sdarrenr 728145516Sdarrenr/* 729145516Sdarrenr * iplread/ipllog 730145516Sdarrenr * both of these must operate with at least splnet() lest they be 731145516Sdarrenr * called during packet processing and cause an inconsistancy to appear in 732145516Sdarrenr * the filter lists. 733145516Sdarrenr */ 734145516Sdarrenr#if (BSD >= 199306) 735145516Sdarrenrint iplread(dev, uio, ioflag) 736145516Sdarrenrint ioflag; 737145516Sdarrenr#else 738145516Sdarrenrint iplread(dev, uio) 739145516Sdarrenr#endif 740145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 741145516Sdarrenrstruct cdev *dev; 742145516Sdarrenr#else 743145516Sdarrenrdev_t dev; 744145516Sdarrenr#endif 745145516Sdarrenrregister struct uio *uio; 746145516Sdarrenr{ 747145516Sdarrenr 748145516Sdarrenr# ifdef IPFILTER_SYNC 749145516Sdarrenr if (GET_MINOR(dev) == IPL_LOGSYNC) 750145516Sdarrenr return ipfsync_read(uio); 751145516Sdarrenr# endif 752145516Sdarrenr 753145516Sdarrenr#ifdef IPFILTER_LOG 754145516Sdarrenr return ipflog_read(GET_MINOR(dev), uio); 755145516Sdarrenr#else 756145516Sdarrenr return ENXIO; 757145516Sdarrenr#endif 758145516Sdarrenr} 759145516Sdarrenr 760145516Sdarrenr 761145516Sdarrenr/* 762145516Sdarrenr * iplwrite 763145516Sdarrenr * both of these must operate with at least splnet() lest they be 764145516Sdarrenr * called during packet processing and cause an inconsistancy to appear in 765145516Sdarrenr * the filter lists. 766145516Sdarrenr */ 767145516Sdarrenr#if (BSD >= 199306) 768145516Sdarrenrint iplwrite(dev, uio, ioflag) 769145516Sdarrenrint ioflag; 770145516Sdarrenr#else 771145516Sdarrenrint iplwrite(dev, uio) 772145516Sdarrenr#endif 773145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 774145516Sdarrenrstruct cdev *dev; 775145516Sdarrenr#else 776145516Sdarrenrdev_t dev; 777145516Sdarrenr#endif 778145516Sdarrenrregister struct uio *uio; 779145516Sdarrenr{ 780145516Sdarrenr 781145516Sdarrenr#ifdef IPFILTER_SYNC 782145516Sdarrenr if (GET_MINOR(dev) == IPL_LOGSYNC) 783145516Sdarrenr return ipfsync_write(uio); 784145516Sdarrenr#endif 785145516Sdarrenr return ENXIO; 786145516Sdarrenr} 787145516Sdarrenr 788145516Sdarrenr 789145516Sdarrenr/* 790145516Sdarrenr * fr_send_reset - this could conceivably be a call to tcp_respond(), but that 791145516Sdarrenr * requires a large amount of setting up and isn't any more efficient. 792145516Sdarrenr */ 793145516Sdarrenrint fr_send_reset(fin) 794145516Sdarrenrfr_info_t *fin; 795145516Sdarrenr{ 796145516Sdarrenr struct tcphdr *tcp, *tcp2; 797145516Sdarrenr int tlen = 0, hlen; 798145516Sdarrenr struct mbuf *m; 799145516Sdarrenr#ifdef USE_INET6 800145516Sdarrenr ip6_t *ip6; 801145516Sdarrenr#endif 802145516Sdarrenr ip_t *ip; 803145516Sdarrenr 804145516Sdarrenr tcp = fin->fin_dp; 805145516Sdarrenr if (tcp->th_flags & TH_RST) 806145516Sdarrenr return -1; /* feedback loop */ 807145516Sdarrenr 808145516Sdarrenr#ifndef IPFILTER_CKSUM 809145516Sdarrenr if (fr_checkl4sum(fin) == -1) 810145516Sdarrenr return -1; 811145516Sdarrenr#endif 812145516Sdarrenr 813145516Sdarrenr tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) + 814145516Sdarrenr ((tcp->th_flags & TH_SYN) ? 1 : 0) + 815145516Sdarrenr ((tcp->th_flags & TH_FIN) ? 1 : 0); 816145516Sdarrenr 817145516Sdarrenr#ifdef USE_INET6 818145516Sdarrenr hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t); 819145516Sdarrenr#else 820145516Sdarrenr hlen = sizeof(ip_t); 821145516Sdarrenr#endif 822145516Sdarrenr#ifdef MGETHDR 823145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 824145516Sdarrenr#else 825145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 826145516Sdarrenr#endif 827145516Sdarrenr if (m == NULL) 828145516Sdarrenr return -1; 829145516Sdarrenr if (sizeof(*tcp2) + hlen > MLEN) { 830145516Sdarrenr MCLGET(m, M_DONTWAIT); 831145516Sdarrenr if ((m->m_flags & M_EXT) == 0) { 832145516Sdarrenr FREE_MB_T(m); 833145516Sdarrenr return -1; 834145516Sdarrenr } 835145516Sdarrenr } 836145516Sdarrenr 837145516Sdarrenr m->m_len = sizeof(*tcp2) + hlen; 838145516Sdarrenr#if (BSD >= 199103) 839145516Sdarrenr m->m_data += max_linkhdr; 840145516Sdarrenr m->m_pkthdr.len = m->m_len; 841145516Sdarrenr m->m_pkthdr.rcvif = (struct ifnet *)0; 842145516Sdarrenr#endif 843145516Sdarrenr ip = mtod(m, struct ip *); 844145516Sdarrenr bzero((char *)ip, hlen); 845145516Sdarrenr#ifdef USE_INET6 846145516Sdarrenr ip6 = (ip6_t *)ip; 847145516Sdarrenr#endif 848145516Sdarrenr tcp2 = (struct tcphdr *)((char *)ip + hlen); 849145516Sdarrenr tcp2->th_sport = tcp->th_dport; 850145516Sdarrenr tcp2->th_dport = tcp->th_sport; 851145516Sdarrenr 852145516Sdarrenr if (tcp->th_flags & TH_ACK) { 853145516Sdarrenr tcp2->th_seq = tcp->th_ack; 854145516Sdarrenr tcp2->th_flags = TH_RST; 855145516Sdarrenr tcp2->th_ack = 0; 856145516Sdarrenr } else { 857145516Sdarrenr tcp2->th_seq = 0; 858145516Sdarrenr tcp2->th_ack = ntohl(tcp->th_seq); 859145516Sdarrenr tcp2->th_ack += tlen; 860145516Sdarrenr tcp2->th_ack = htonl(tcp2->th_ack); 861145516Sdarrenr tcp2->th_flags = TH_RST|TH_ACK; 862145516Sdarrenr } 863145516Sdarrenr TCP_X2_A(tcp2, 0); 864145516Sdarrenr TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2); 865145516Sdarrenr tcp2->th_win = tcp->th_win; 866145516Sdarrenr tcp2->th_sum = 0; 867145516Sdarrenr tcp2->th_urp = 0; 868145516Sdarrenr 869145516Sdarrenr#ifdef USE_INET6 870145516Sdarrenr if (fin->fin_v == 6) { 871145516Sdarrenr ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 872145516Sdarrenr ip6->ip6_plen = htons(sizeof(struct tcphdr)); 873145516Sdarrenr ip6->ip6_nxt = IPPROTO_TCP; 874145516Sdarrenr ip6->ip6_hlim = 0; 875145516Sdarrenr ip6->ip6_src = fin->fin_dst6; 876145516Sdarrenr ip6->ip6_dst = fin->fin_src6; 877145516Sdarrenr tcp2->th_sum = in6_cksum(m, IPPROTO_TCP, 878145516Sdarrenr sizeof(*ip6), sizeof(*tcp2)); 879145516Sdarrenr return fr_send_ip(fin, m, &m); 880145516Sdarrenr } 881145516Sdarrenr#endif 882145516Sdarrenr ip->ip_p = IPPROTO_TCP; 883145516Sdarrenr ip->ip_len = htons(sizeof(struct tcphdr)); 884145516Sdarrenr ip->ip_src.s_addr = fin->fin_daddr; 885145516Sdarrenr ip->ip_dst.s_addr = fin->fin_saddr; 886145516Sdarrenr tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2)); 887145516Sdarrenr ip->ip_len = hlen + sizeof(*tcp2); 888145516Sdarrenr return fr_send_ip(fin, m, &m); 889145516Sdarrenr} 890145516Sdarrenr 891145516Sdarrenr 892145516Sdarrenrstatic int fr_send_ip(fin, m, mpp) 893145516Sdarrenrfr_info_t *fin; 894145516Sdarrenrmb_t *m, **mpp; 895145516Sdarrenr{ 896145516Sdarrenr fr_info_t fnew; 897145516Sdarrenr ip_t *ip, *oip; 898145516Sdarrenr int hlen; 899145516Sdarrenr 900145516Sdarrenr ip = mtod(m, ip_t *); 901145516Sdarrenr bzero((char *)&fnew, sizeof(fnew)); 902145516Sdarrenr 903145516Sdarrenr IP_V_A(ip, fin->fin_v); 904145516Sdarrenr switch (fin->fin_v) 905145516Sdarrenr { 906145516Sdarrenr case 4 : 907145516Sdarrenr fnew.fin_v = 4; 908145516Sdarrenr oip = fin->fin_ip; 909145516Sdarrenr IP_HL_A(ip, sizeof(*oip) >> 2); 910145516Sdarrenr ip->ip_tos = oip->ip_tos; 911145516Sdarrenr ip->ip_id = fin->fin_ip->ip_id; 912145516Sdarrenr#if (__FreeBSD_version > 460000) 913145516Sdarrenr ip->ip_off = path_mtu_discovery ? IP_DF : 0; 914145516Sdarrenr#else 915145516Sdarrenr ip->ip_off = 0; 916145516Sdarrenr#endif 917145516Sdarrenr ip->ip_ttl = ip_defttl; 918145516Sdarrenr ip->ip_sum = 0; 919145516Sdarrenr hlen = sizeof(*oip); 920145516Sdarrenr break; 921145516Sdarrenr#ifdef USE_INET6 922145516Sdarrenr case 6 : 923145516Sdarrenr { 924145516Sdarrenr ip6_t *ip6 = (ip6_t *)ip; 925145516Sdarrenr 926145516Sdarrenr ip6->ip6_vfc = 0x60; 927145516Sdarrenr ip6->ip6_hlim = IPDEFTTL; 928145516Sdarrenr 929145516Sdarrenr fnew.fin_v = 6; 930145516Sdarrenr hlen = sizeof(*ip6); 931145516Sdarrenr break; 932145516Sdarrenr } 933145516Sdarrenr#endif 934145516Sdarrenr default : 935145516Sdarrenr return EINVAL; 936145516Sdarrenr } 937145516Sdarrenr#ifdef IPSEC 938145516Sdarrenr m->m_pkthdr.rcvif = NULL; 939145516Sdarrenr#endif 940145516Sdarrenr 941145516Sdarrenr fnew.fin_ifp = fin->fin_ifp; 942145516Sdarrenr fnew.fin_flx = FI_NOCKSUM; 943145516Sdarrenr fnew.fin_m = m; 944145516Sdarrenr fnew.fin_ip = ip; 945145516Sdarrenr fnew.fin_mp = mpp; 946145516Sdarrenr fnew.fin_hlen = hlen; 947145516Sdarrenr fnew.fin_dp = (char *)ip + hlen; 948145516Sdarrenr (void) fr_makefrip(hlen, ip, &fnew); 949145516Sdarrenr 950145516Sdarrenr return fr_fastroute(m, mpp, &fnew, NULL); 951145516Sdarrenr} 952145516Sdarrenr 953145516Sdarrenr 954145516Sdarrenrint fr_send_icmp_err(type, fin, dst) 955145516Sdarrenrint type; 956145516Sdarrenrfr_info_t *fin; 957145516Sdarrenrint dst; 958145516Sdarrenr{ 959145516Sdarrenr int err, hlen, xtra, iclen, ohlen, avail, code; 960145516Sdarrenr struct in_addr dst4; 961145516Sdarrenr struct icmp *icmp; 962145516Sdarrenr struct mbuf *m; 963145516Sdarrenr void *ifp; 964145516Sdarrenr#ifdef USE_INET6 965145516Sdarrenr ip6_t *ip6; 966145516Sdarrenr struct in6_addr dst6; 967145516Sdarrenr#endif 968145516Sdarrenr ip_t *ip, *ip2; 969145516Sdarrenr 970145516Sdarrenr if ((type < 0) || (type > ICMP_MAXTYPE)) 971145516Sdarrenr return -1; 972145516Sdarrenr 973145516Sdarrenr code = fin->fin_icode; 974145516Sdarrenr#ifdef USE_INET6 975145516Sdarrenr if ((code < 0) || (code > sizeof(icmptoicmp6unreach)/sizeof(int))) 976145516Sdarrenr return -1; 977145516Sdarrenr#endif 978145516Sdarrenr 979145516Sdarrenr#ifndef IPFILTER_CKSUM 980145516Sdarrenr if (fr_checkl4sum(fin) == -1) 981145516Sdarrenr return -1; 982145516Sdarrenr#endif 983145516Sdarrenr#ifdef MGETHDR 984145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 985145516Sdarrenr#else 986145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 987145516Sdarrenr#endif 988145516Sdarrenr if (m == NULL) 989145516Sdarrenr return -1; 990145516Sdarrenr avail = MHLEN; 991145516Sdarrenr 992145516Sdarrenr xtra = 0; 993145516Sdarrenr hlen = 0; 994145516Sdarrenr ohlen = 0; 995145516Sdarrenr ifp = fin->fin_ifp; 996145516Sdarrenr if (fin->fin_v == 4) { 997145516Sdarrenr if ((fin->fin_p == IPPROTO_ICMP) && 998145516Sdarrenr !(fin->fin_flx & FI_SHORT)) 999145516Sdarrenr switch (ntohs(fin->fin_data[0]) >> 8) 1000145516Sdarrenr { 1001145516Sdarrenr case ICMP_ECHO : 1002145516Sdarrenr case ICMP_TSTAMP : 1003145516Sdarrenr case ICMP_IREQ : 1004145516Sdarrenr case ICMP_MASKREQ : 1005145516Sdarrenr break; 1006145516Sdarrenr default : 1007145516Sdarrenr FREE_MB_T(m); 1008145516Sdarrenr return 0; 1009145516Sdarrenr } 1010145516Sdarrenr 1011145516Sdarrenr if (dst == 0) { 1012145516Sdarrenr if (fr_ifpaddr(4, FRI_NORMAL, ifp, 1013145516Sdarrenr &dst4, NULL) == -1) { 1014145516Sdarrenr FREE_MB_T(m); 1015145516Sdarrenr return -1; 1016145516Sdarrenr } 1017145516Sdarrenr } else 1018145516Sdarrenr dst4.s_addr = fin->fin_daddr; 1019145516Sdarrenr 1020145516Sdarrenr hlen = sizeof(ip_t); 1021145516Sdarrenr ohlen = fin->fin_hlen; 1022145516Sdarrenr if (fin->fin_hlen < fin->fin_plen) 1023145516Sdarrenr xtra = MIN(fin->fin_dlen, 8); 1024145516Sdarrenr else 1025145516Sdarrenr xtra = 0; 1026145516Sdarrenr } 1027145516Sdarrenr 1028145516Sdarrenr#ifdef USE_INET6 1029145516Sdarrenr else if (fin->fin_v == 6) { 1030145516Sdarrenr hlen = sizeof(ip6_t); 1031145516Sdarrenr ohlen = sizeof(ip6_t); 1032145516Sdarrenr type = icmptoicmp6types[type]; 1033145516Sdarrenr if (type == ICMP6_DST_UNREACH) 1034145516Sdarrenr code = icmptoicmp6unreach[code]; 1035145516Sdarrenr 1036145516Sdarrenr if (hlen + sizeof(*icmp) + max_linkhdr + 1037145516Sdarrenr fin->fin_plen > avail) { 1038145516Sdarrenr MCLGET(m, M_DONTWAIT); 1039145516Sdarrenr if ((m->m_flags & M_EXT) == 0) { 1040145516Sdarrenr FREE_MB_T(m); 1041145516Sdarrenr return -1; 1042145516Sdarrenr } 1043145516Sdarrenr avail = MCLBYTES; 1044145516Sdarrenr } 1045145516Sdarrenr xtra = MIN(fin->fin_plen, 1046145516Sdarrenr avail - hlen - sizeof(*icmp) - max_linkhdr); 1047145516Sdarrenr if (dst == 0) { 1048145516Sdarrenr if (fr_ifpaddr(6, FRI_NORMAL, ifp, 1049145516Sdarrenr (struct in_addr *)&dst6, NULL) == -1) { 1050145516Sdarrenr FREE_MB_T(m); 1051145516Sdarrenr return -1; 1052145516Sdarrenr } 1053145516Sdarrenr } else 1054145516Sdarrenr dst6 = fin->fin_dst6; 1055145516Sdarrenr } 1056145516Sdarrenr#endif 1057145516Sdarrenr else { 1058145516Sdarrenr FREE_MB_T(m); 1059145516Sdarrenr return -1; 1060145516Sdarrenr } 1061145516Sdarrenr 1062145516Sdarrenr iclen = hlen + sizeof(*icmp); 1063145516Sdarrenr avail -= (max_linkhdr + iclen); 1064145516Sdarrenr if (avail < 0) { 1065145516Sdarrenr FREE_MB_T(m); 1066145516Sdarrenr return -1; 1067145516Sdarrenr } 1068145516Sdarrenr if (xtra > avail) 1069145516Sdarrenr xtra = avail; 1070145516Sdarrenr iclen += xtra; 1071145516Sdarrenr m->m_data += max_linkhdr; 1072145516Sdarrenr m->m_pkthdr.rcvif = (struct ifnet *)0; 1073145516Sdarrenr m->m_pkthdr.len = iclen; 1074145516Sdarrenr m->m_len = iclen; 1075145516Sdarrenr ip = mtod(m, ip_t *); 1076145516Sdarrenr icmp = (struct icmp *)((char *)ip + hlen); 1077145516Sdarrenr ip2 = (ip_t *)&icmp->icmp_ip; 1078145516Sdarrenr 1079145516Sdarrenr icmp->icmp_type = type; 1080145516Sdarrenr icmp->icmp_code = fin->fin_icode; 1081145516Sdarrenr icmp->icmp_cksum = 0; 1082145516Sdarrenr#ifdef icmp_nextmtu 1083145516Sdarrenr if (type == ICMP_UNREACH && 1084145516Sdarrenr fin->fin_icode == ICMP_UNREACH_NEEDFRAG && ifp) 1085145516Sdarrenr icmp->icmp_nextmtu = htons(((struct ifnet *)ifp)->if_mtu); 1086145516Sdarrenr#endif 1087145516Sdarrenr 1088145516Sdarrenr bcopy((char *)fin->fin_ip, (char *)ip2, ohlen); 1089145516Sdarrenr 1090145516Sdarrenr#ifdef USE_INET6 1091145516Sdarrenr ip6 = (ip6_t *)ip; 1092145516Sdarrenr if (fin->fin_v == 6) { 1093145516Sdarrenr ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 1094145516Sdarrenr ip6->ip6_plen = htons(iclen - hlen); 1095145516Sdarrenr ip6->ip6_nxt = IPPROTO_ICMPV6; 1096145516Sdarrenr ip6->ip6_hlim = 0; 1097145516Sdarrenr ip6->ip6_src = dst6; 1098145516Sdarrenr ip6->ip6_dst = fin->fin_src6; 1099145516Sdarrenr if (xtra > 0) 1100145516Sdarrenr bcopy((char *)fin->fin_ip + ohlen, 1101145516Sdarrenr (char *)&icmp->icmp_ip + ohlen, xtra); 1102145516Sdarrenr icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6, 1103145516Sdarrenr sizeof(*ip6), iclen - hlen); 1104145516Sdarrenr } else 1105145516Sdarrenr#endif 1106145516Sdarrenr { 1107145516Sdarrenr ip2->ip_len = htons(ip2->ip_len); 1108145516Sdarrenr ip2->ip_off = htons(ip2->ip_off); 1109145516Sdarrenr ip->ip_p = IPPROTO_ICMP; 1110145516Sdarrenr ip->ip_src.s_addr = dst4.s_addr; 1111145516Sdarrenr ip->ip_dst.s_addr = fin->fin_saddr; 1112145516Sdarrenr 1113145516Sdarrenr if (xtra > 0) 1114145516Sdarrenr bcopy((char *)fin->fin_ip + ohlen, 1115145516Sdarrenr (char *)&icmp->icmp_ip + ohlen, xtra); 1116145516Sdarrenr icmp->icmp_cksum = ipf_cksum((u_short *)icmp, 1117145516Sdarrenr sizeof(*icmp) + 8); 1118145516Sdarrenr ip->ip_len = iclen; 1119145516Sdarrenr ip->ip_p = IPPROTO_ICMP; 1120145516Sdarrenr } 1121145516Sdarrenr err = fr_send_ip(fin, m, &m); 1122145516Sdarrenr return err; 1123145516Sdarrenr} 1124145516Sdarrenr 1125145516Sdarrenr 1126145516Sdarrenr#if !defined(IPFILTER_LKM) && (__FreeBSD_version < 300000) 1127145516Sdarrenr# if (BSD < 199306) 1128145516Sdarrenrint iplinit __P((void)); 1129145516Sdarrenr 1130145516Sdarrenrint 1131145516Sdarrenr# else 1132145516Sdarrenrvoid iplinit __P((void)); 1133145516Sdarrenr 1134145516Sdarrenrvoid 1135145516Sdarrenr# endif 1136145516Sdarrenriplinit() 1137145516Sdarrenr{ 1138145516Sdarrenr if (iplattach() != 0) 1139145516Sdarrenr printf("IP Filter failed to attach\n"); 1140145516Sdarrenr ip_init(); 1141145516Sdarrenr} 1142145516Sdarrenr#endif /* __FreeBSD_version < 300000 */ 1143145516Sdarrenr 1144145516Sdarrenr 1145145516Sdarrenrint fr_fastroute(m0, mpp, fin, fdp) 1146145516Sdarrenrmb_t *m0, **mpp; 1147145516Sdarrenrfr_info_t *fin; 1148145516Sdarrenrfrdest_t *fdp; 1149145516Sdarrenr{ 1150145516Sdarrenr register struct ip *ip, *mhip; 1151145516Sdarrenr register struct mbuf *m = m0; 1152145516Sdarrenr register struct route *ro; 1153145516Sdarrenr int len, off, error = 0, hlen, code; 1154145516Sdarrenr struct ifnet *ifp, *sifp; 1155145516Sdarrenr struct sockaddr_in *dst; 1156145516Sdarrenr struct route iproute; 1157145516Sdarrenr u_short ip_off; 1158145516Sdarrenr frentry_t *fr; 1159145516Sdarrenr 1160145516Sdarrenr#ifdef M_WRITABLE 1161145516Sdarrenr /* 1162145516Sdarrenr * HOT FIX/KLUDGE: 1163145516Sdarrenr * 1164145516Sdarrenr * If the mbuf we're about to send is not writable (because of 1165145516Sdarrenr * a cluster reference, for example) we'll need to make a copy 1166145516Sdarrenr * of it since this routine modifies the contents. 1167145516Sdarrenr * 1168145516Sdarrenr * If you have non-crappy network hardware that can transmit data 1169145516Sdarrenr * from the mbuf, rather than making a copy, this is gonna be a 1170145516Sdarrenr * problem. 1171145516Sdarrenr */ 1172145516Sdarrenr if (M_WRITABLE(m) == 0) { 1173145516Sdarrenr if ((m0 = m_dup(m, M_DONTWAIT)) != 0) { 1174145516Sdarrenr FREE_MB_T(m); 1175145516Sdarrenr m = m0; 1176145516Sdarrenr *mpp = m; 1177145516Sdarrenr } else { 1178145516Sdarrenr error = ENOBUFS; 1179145516Sdarrenr FREE_MB_T(m); 1180145516Sdarrenr *mpp = NULL; 1181145516Sdarrenr fr_frouteok[1]++; 1182145516Sdarrenr } 1183145516Sdarrenr } 1184145516Sdarrenr#endif 1185145516Sdarrenr 1186145516Sdarrenr#ifdef USE_INET6 1187145516Sdarrenr if (fin->fin_v == 6) { 1188145516Sdarrenr /* 1189145516Sdarrenr * currently "to <if>" and "to <if>:ip#" are not supported 1190145516Sdarrenr * for IPv6 1191145516Sdarrenr */ 1192145516Sdarrenr#if (__FreeBSD_version >= 490000) 1193145516Sdarrenr return ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 1194145516Sdarrenr#else 1195145516Sdarrenr return ip6_output(m0, NULL, NULL, 0, NULL, NULL); 1196145516Sdarrenr#endif 1197145516Sdarrenr } 1198145516Sdarrenr#endif 1199145516Sdarrenr 1200145516Sdarrenr hlen = fin->fin_hlen; 1201145516Sdarrenr ip = mtod(m0, struct ip *); 1202145516Sdarrenr 1203145516Sdarrenr /* 1204145516Sdarrenr * Route packet. 1205145516Sdarrenr */ 1206145516Sdarrenr ro = &iproute; 1207145516Sdarrenr bzero((caddr_t)ro, sizeof (*ro)); 1208145516Sdarrenr dst = (struct sockaddr_in *)&ro->ro_dst; 1209145516Sdarrenr dst->sin_family = AF_INET; 1210145516Sdarrenr dst->sin_addr = ip->ip_dst; 1211145516Sdarrenr 1212145516Sdarrenr fr = fin->fin_fr; 1213145516Sdarrenr if (fdp != NULL) 1214145516Sdarrenr ifp = fdp->fd_ifp; 1215145516Sdarrenr else 1216145516Sdarrenr ifp = fin->fin_ifp; 1217145516Sdarrenr 1218145516Sdarrenr if ((ifp == NULL) && (!fr || !(fr->fr_flags & FR_FASTROUTE))) { 1219145516Sdarrenr error = -2; 1220145516Sdarrenr goto bad; 1221145516Sdarrenr } 1222145516Sdarrenr 1223145516Sdarrenr /* 1224145516Sdarrenr * In case we're here due to "to <if>" being used with "keep state", 1225145516Sdarrenr * check that we're going in the correct direction. 1226145516Sdarrenr */ 1227145516Sdarrenr if ((fr != NULL) && (fin->fin_rev != 0)) { 1228145516Sdarrenr if ((ifp != NULL) && (fdp == &fr->fr_tif)) 1229145516Sdarrenr return -1; 1230145516Sdarrenr } 1231145516Sdarrenr if (fdp != NULL) { 1232145516Sdarrenr if (fdp->fd_ip.s_addr != 0) 1233145516Sdarrenr dst->sin_addr = fdp->fd_ip; 1234145516Sdarrenr } 1235145516Sdarrenr 1236145516Sdarrenr dst->sin_len = sizeof(*dst); 1237145516Sdarrenr rtalloc(ro); 1238145516Sdarrenr 1239145516Sdarrenr if ((ifp == NULL) && (ro->ro_rt != NULL)) 1240145516Sdarrenr ifp = ro->ro_rt->rt_ifp; 1241145516Sdarrenr 1242145516Sdarrenr if ((ro->ro_rt == NULL) || (ifp == NULL)) { 1243145516Sdarrenr if (in_localaddr(ip->ip_dst)) 1244145516Sdarrenr error = EHOSTUNREACH; 1245145516Sdarrenr else 1246145516Sdarrenr error = ENETUNREACH; 1247145516Sdarrenr goto bad; 1248145516Sdarrenr } 1249145516Sdarrenr if (ro->ro_rt->rt_flags & RTF_GATEWAY) 1250145516Sdarrenr dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; 1251145516Sdarrenr if (ro->ro_rt) 1252145516Sdarrenr ro->ro_rt->rt_use++; 1253145516Sdarrenr 1254145516Sdarrenr /* 1255145516Sdarrenr * For input packets which are being "fastrouted", they won't 1256145516Sdarrenr * go back through output filtering and miss their chance to get 1257145516Sdarrenr * NAT'd and counted. 1258145516Sdarrenr */ 1259145516Sdarrenr if (fin->fin_out == 0) { 1260145516Sdarrenr sifp = fin->fin_ifp; 1261145516Sdarrenr fin->fin_ifp = ifp; 1262145516Sdarrenr fin->fin_out = 1; 1263145516Sdarrenr (void) fr_acctpkt(fin, NULL); 1264145516Sdarrenr fin->fin_fr = NULL; 1265145516Sdarrenr if (!fr || !(fr->fr_flags & FR_RETMASK)) { 1266145516Sdarrenr u_32_t pass; 1267145516Sdarrenr 1268145516Sdarrenr (void) fr_checkstate(fin, &pass); 1269145516Sdarrenr } 1270145516Sdarrenr 1271145516Sdarrenr switch (fr_checknatout(fin, NULL)) 1272145516Sdarrenr { 1273145516Sdarrenr case 0 : 1274145516Sdarrenr break; 1275145516Sdarrenr case 1 : 1276145516Sdarrenr ip->ip_sum = 0; 1277145516Sdarrenr break; 1278145516Sdarrenr case -1 : 1279145516Sdarrenr error = -1; 1280145516Sdarrenr goto done; 1281145516Sdarrenr break; 1282145516Sdarrenr } 1283145516Sdarrenr 1284145516Sdarrenr fin->fin_ifp = sifp; 1285145516Sdarrenr fin->fin_out = 0; 1286145516Sdarrenr } else 1287145516Sdarrenr ip->ip_sum = 0; 1288145516Sdarrenr /* 1289145516Sdarrenr * If small enough for interface, can just send directly. 1290145516Sdarrenr */ 1291145516Sdarrenr if (ip->ip_len <= ifp->if_mtu) { 1292145516Sdarrenr ip->ip_len = htons(ip->ip_len); 1293145516Sdarrenr ip->ip_off = htons(ip->ip_off); 1294145516Sdarrenr 1295145516Sdarrenr if (!ip->ip_sum) 1296145516Sdarrenr ip->ip_sum = in_cksum(m, hlen); 1297145516Sdarrenr error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, 1298145516Sdarrenr ro->ro_rt); 1299145516Sdarrenr goto done; 1300145516Sdarrenr } 1301145516Sdarrenr /* 1302145516Sdarrenr * Too large for interface; fragment if possible. 1303145516Sdarrenr * Must be able to put at least 8 bytes per fragment. 1304145516Sdarrenr */ 1305145516Sdarrenr ip_off = ntohs(ip->ip_off); 1306145516Sdarrenr if (ip_off & IP_DF) { 1307145516Sdarrenr error = EMSGSIZE; 1308145516Sdarrenr goto bad; 1309145516Sdarrenr } 1310145516Sdarrenr len = (ifp->if_mtu - hlen) &~ 7; 1311145516Sdarrenr if (len < 8) { 1312145516Sdarrenr error = EMSGSIZE; 1313145516Sdarrenr goto bad; 1314145516Sdarrenr } 1315145516Sdarrenr 1316145516Sdarrenr { 1317145516Sdarrenr int mhlen, firstlen = len; 1318145516Sdarrenr struct mbuf **mnext = &m->m_act; 1319145516Sdarrenr 1320145516Sdarrenr /* 1321145516Sdarrenr * Loop through length of segment after first fragment, 1322145516Sdarrenr * make new header and copy data of each part and link onto chain. 1323145516Sdarrenr */ 1324145516Sdarrenr m0 = m; 1325145516Sdarrenr mhlen = sizeof (struct ip); 1326145516Sdarrenr for (off = hlen + len; off < ip->ip_len; off += len) { 1327145516Sdarrenr#ifdef MGETHDR 1328145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 1329145516Sdarrenr#else 1330145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 1331145516Sdarrenr#endif 1332145516Sdarrenr if (m == 0) { 1333145516Sdarrenr m = m0; 1334145516Sdarrenr error = ENOBUFS; 1335145516Sdarrenr goto bad; 1336145516Sdarrenr } 1337145516Sdarrenr m->m_data += max_linkhdr; 1338145516Sdarrenr mhip = mtod(m, struct ip *); 1339145516Sdarrenr bcopy((char *)ip, (char *)mhip, sizeof(*ip)); 1340145516Sdarrenr if (hlen > sizeof (struct ip)) { 1341145516Sdarrenr mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 1342145516Sdarrenr IP_HL_A(mhip, mhlen >> 2); 1343145516Sdarrenr } 1344145516Sdarrenr m->m_len = mhlen; 1345145516Sdarrenr mhip->ip_off = ((off - hlen) >> 3) + ip_off; 1346145516Sdarrenr if (off + len >= ip->ip_len) 1347145516Sdarrenr len = ip->ip_len - off; 1348145516Sdarrenr else 1349145516Sdarrenr mhip->ip_off |= IP_MF; 1350145516Sdarrenr mhip->ip_len = htons((u_short)(len + mhlen)); 1351145516Sdarrenr m->m_next = m_copy(m0, off, len); 1352145516Sdarrenr if (m->m_next == 0) { 1353145516Sdarrenr error = ENOBUFS; /* ??? */ 1354145516Sdarrenr goto sendorfree; 1355145516Sdarrenr } 1356145516Sdarrenr m->m_pkthdr.len = mhlen + len; 1357145516Sdarrenr m->m_pkthdr.rcvif = NULL; 1358145516Sdarrenr mhip->ip_off = htons((u_short)mhip->ip_off); 1359145516Sdarrenr mhip->ip_sum = 0; 1360145516Sdarrenr mhip->ip_sum = in_cksum(m, mhlen); 1361145516Sdarrenr *mnext = m; 1362145516Sdarrenr mnext = &m->m_act; 1363145516Sdarrenr } 1364145516Sdarrenr /* 1365145516Sdarrenr * Update first fragment by trimming what's been copied out 1366145516Sdarrenr * and updating header, then send each fragment (in order). 1367145516Sdarrenr */ 1368145516Sdarrenr m_adj(m0, hlen + firstlen - ip->ip_len); 1369145516Sdarrenr ip->ip_len = htons((u_short)(hlen + firstlen)); 1370145516Sdarrenr ip->ip_off = htons((u_short)IP_MF); 1371145516Sdarrenr ip->ip_sum = 0; 1372145516Sdarrenr ip->ip_sum = in_cksum(m0, hlen); 1373145516Sdarrenrsendorfree: 1374145516Sdarrenr for (m = m0; m; m = m0) { 1375145516Sdarrenr m0 = m->m_act; 1376145516Sdarrenr m->m_act = 0; 1377145516Sdarrenr if (error == 0) 1378145516Sdarrenr error = (*ifp->if_output)(ifp, m, 1379145516Sdarrenr (struct sockaddr *)dst, ro->ro_rt); 1380145516Sdarrenr else 1381145516Sdarrenr FREE_MB_T(m); 1382145516Sdarrenr } 1383145516Sdarrenr } 1384145516Sdarrenrdone: 1385145516Sdarrenr if (!error) 1386145516Sdarrenr fr_frouteok[0]++; 1387145516Sdarrenr else 1388145516Sdarrenr fr_frouteok[1]++; 1389145516Sdarrenr 1390145516Sdarrenr if (ro->ro_rt) { 1391145516Sdarrenr RTFREE(ro->ro_rt); 1392145516Sdarrenr } 1393145516Sdarrenr *mpp = NULL; 1394145516Sdarrenr return 0; 1395145516Sdarrenrbad: 1396145516Sdarrenr if (error == EMSGSIZE) { 1397145516Sdarrenr sifp = fin->fin_ifp; 1398145516Sdarrenr code = fin->fin_icode; 1399145516Sdarrenr fin->fin_icode = ICMP_UNREACH_NEEDFRAG; 1400145516Sdarrenr fin->fin_ifp = ifp; 1401145516Sdarrenr (void) fr_send_icmp_err(ICMP_UNREACH, fin, 1); 1402145516Sdarrenr fin->fin_ifp = sifp; 1403145516Sdarrenr fin->fin_icode = code; 1404145516Sdarrenr } 1405145516Sdarrenr FREE_MB_T(m); 1406145516Sdarrenr goto done; 1407145516Sdarrenr} 1408145516Sdarrenr 1409145516Sdarrenr 1410145516Sdarrenrint fr_verifysrc(fin) 1411145516Sdarrenrfr_info_t *fin; 1412145516Sdarrenr{ 1413145516Sdarrenr struct sockaddr_in *dst; 1414145516Sdarrenr struct route iproute; 1415145516Sdarrenr 1416145516Sdarrenr bzero((char *)&iproute, sizeof(iproute)); 1417145516Sdarrenr dst = (struct sockaddr_in *)&iproute.ro_dst; 1418145516Sdarrenr dst->sin_len = sizeof(*dst); 1419145516Sdarrenr dst->sin_family = AF_INET; 1420145516Sdarrenr dst->sin_addr = fin->fin_src; 1421145516Sdarrenr rtalloc(&iproute); 1422145516Sdarrenr if (iproute.ro_rt == NULL) 1423145516Sdarrenr return 0; 1424145516Sdarrenr return (fin->fin_ifp == iproute.ro_rt->rt_ifp); 1425145516Sdarrenr} 1426145516Sdarrenr 1427145516Sdarrenr 1428145516Sdarrenr/* 1429145516Sdarrenr * return the first IP Address associated with an interface 1430145516Sdarrenr */ 1431145516Sdarrenrint fr_ifpaddr(v, atype, ifptr, inp, inpmask) 1432145516Sdarrenrint v, atype; 1433145516Sdarrenrvoid *ifptr; 1434145516Sdarrenrstruct in_addr *inp, *inpmask; 1435145516Sdarrenr{ 1436145516Sdarrenr#ifdef USE_INET6 1437145516Sdarrenr struct in6_addr *inp6 = NULL; 1438145516Sdarrenr#endif 1439145516Sdarrenr struct sockaddr *sock, *mask; 1440145516Sdarrenr struct sockaddr_in *sin; 1441145516Sdarrenr struct ifaddr *ifa; 1442145516Sdarrenr struct ifnet *ifp; 1443145516Sdarrenr 1444145516Sdarrenr if ((ifptr == NULL) || (ifptr == (void *)-1)) 1445145516Sdarrenr return -1; 1446145516Sdarrenr 1447145516Sdarrenr sin = NULL; 1448145516Sdarrenr ifp = ifptr; 1449145516Sdarrenr 1450145516Sdarrenr if (v == 4) 1451145516Sdarrenr inp->s_addr = 0; 1452145516Sdarrenr#ifdef USE_INET6 1453145516Sdarrenr else if (v == 6) 1454145516Sdarrenr bzero((char *)inp, sizeof(struct in6_addr)); 1455145516Sdarrenr#endif 1456145516Sdarrenr#if (__FreeBSD_version >= 300000) 1457145516Sdarrenr ifa = TAILQ_FIRST(&ifp->if_addrhead); 1458145516Sdarrenr#else 1459145516Sdarrenr ifa = ifp->if_addrlist; 1460145516Sdarrenr#endif /* __FreeBSD_version >= 300000 */ 1461145516Sdarrenr 1462145516Sdarrenr sock = ifa->ifa_addr; 1463145516Sdarrenr while (sock != NULL && ifa != NULL) { 1464145516Sdarrenr sin = (struct sockaddr_in *)sock; 1465145516Sdarrenr if ((v == 4) && (sin->sin_family == AF_INET)) 1466145516Sdarrenr break; 1467145516Sdarrenr#ifdef USE_INET6 1468145516Sdarrenr if ((v == 6) && (sin->sin_family == AF_INET6)) { 1469145516Sdarrenr inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; 1470145516Sdarrenr if (!IN6_IS_ADDR_LINKLOCAL(inp6) && 1471145516Sdarrenr !IN6_IS_ADDR_LOOPBACK(inp6)) 1472145516Sdarrenr break; 1473145516Sdarrenr } 1474145516Sdarrenr#endif 1475145516Sdarrenr#if (__FreeBSD_version >= 300000) 1476145516Sdarrenr ifa = TAILQ_NEXT(ifa, ifa_link); 1477145516Sdarrenr#else 1478145516Sdarrenr ifa = ifa->ifa_next; 1479145516Sdarrenr#endif /* __FreeBSD_version >= 300000 */ 1480145516Sdarrenr if (ifa != NULL) 1481145516Sdarrenr sock = ifa->ifa_addr; 1482145516Sdarrenr } 1483145516Sdarrenr 1484145516Sdarrenr if (ifa == NULL || sin == NULL) 1485145516Sdarrenr return -1; 1486145516Sdarrenr 1487145516Sdarrenr mask = ifa->ifa_netmask; 1488145516Sdarrenr if (atype == FRI_BROADCAST) 1489145516Sdarrenr sock = ifa->ifa_broadaddr; 1490145516Sdarrenr else if (atype == FRI_PEERADDR) 1491145516Sdarrenr sock = ifa->ifa_dstaddr; 1492145516Sdarrenr 1493145516Sdarrenr#ifdef USE_INET6 1494145516Sdarrenr if (v == 6) { 1495145516Sdarrenr return fr_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock, 1496145516Sdarrenr (struct sockaddr_in6 *)mask, 1497145516Sdarrenr inp, inpmask); 1498145516Sdarrenr } 1499145516Sdarrenr#endif 1500145516Sdarrenr return fr_ifpfillv4addr(atype, (struct sockaddr_in *)sock, 1501145516Sdarrenr (struct sockaddr_in *)mask, inp, inpmask); 1502145516Sdarrenr} 1503145516Sdarrenr 1504145516Sdarrenr 1505145516Sdarrenru_32_t fr_newisn(fin) 1506145516Sdarrenrfr_info_t *fin; 1507145516Sdarrenr{ 1508145516Sdarrenr u_32_t newiss; 1509145516Sdarrenr#if (__FreeBSD_version >= 400000) 1510145516Sdarrenr newiss = arc4random(); 1511145516Sdarrenr#else 1512145516Sdarrenr static iss_seq_off = 0; 1513145516Sdarrenr u_char hash[16]; 1514145516Sdarrenr MD5_CTX ctx; 1515145516Sdarrenr 1516145516Sdarrenr /* 1517145516Sdarrenr * Compute the base value of the ISS. It is a hash 1518145516Sdarrenr * of (saddr, sport, daddr, dport, secret). 1519145516Sdarrenr */ 1520145516Sdarrenr MD5Init(&ctx); 1521145516Sdarrenr 1522145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, 1523145516Sdarrenr sizeof(fin->fin_fi.fi_src)); 1524145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, 1525145516Sdarrenr sizeof(fin->fin_fi.fi_dst)); 1526145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); 1527145516Sdarrenr 1528145516Sdarrenr MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret)); 1529145516Sdarrenr 1530145516Sdarrenr MD5Final(hash, &ctx); 1531145516Sdarrenr 1532145516Sdarrenr memcpy(&newiss, hash, sizeof(newiss)); 1533145516Sdarrenr 1534145516Sdarrenr /* 1535145516Sdarrenr * Now increment our "timer", and add it in to 1536145516Sdarrenr * the computed value. 1537145516Sdarrenr * 1538145516Sdarrenr * XXX Use `addin'? 1539145516Sdarrenr * XXX TCP_ISSINCR too large to use? 1540145516Sdarrenr */ 1541145516Sdarrenr iss_seq_off += 0x00010000; 1542145516Sdarrenr newiss += iss_seq_off; 1543145516Sdarrenr#endif 1544145516Sdarrenr return newiss; 1545145516Sdarrenr} 1546145516Sdarrenr 1547145516Sdarrenr 1548145516Sdarrenr/* ------------------------------------------------------------------------ */ 1549145516Sdarrenr/* Function: fr_nextipid */ 1550145516Sdarrenr/* Returns: int - 0 == success, -1 == error (packet should be droppped) */ 1551145516Sdarrenr/* Parameters: fin(I) - pointer to packet information */ 1552145516Sdarrenr/* */ 1553145516Sdarrenr/* Returns the next IPv4 ID to use for this packet. */ 1554145516Sdarrenr/* ------------------------------------------------------------------------ */ 1555145516Sdarrenru_short fr_nextipid(fin) 1556145516Sdarrenrfr_info_t *fin; 1557145516Sdarrenr{ 1558145516Sdarrenr#ifndef RANDOM_IP_ID 1559145516Sdarrenr static u_short ipid = 0; 1560145516Sdarrenr u_short id; 1561145516Sdarrenr 1562145516Sdarrenr MUTEX_ENTER(&ipf_rw); 1563145516Sdarrenr id = ipid++; 1564145516Sdarrenr MUTEX_EXIT(&ipf_rw); 1565145516Sdarrenr#else 1566145516Sdarrenr u_short id; 1567145516Sdarrenr 1568145516Sdarrenr id = ip_randomid(); 1569145516Sdarrenr#endif 1570145516Sdarrenr 1571145516Sdarrenr return id; 1572145516Sdarrenr} 1573145516Sdarrenr 1574145516Sdarrenr 1575145516SdarrenrINLINE void fr_checkv4sum(fin) 1576145516Sdarrenrfr_info_t *fin; 1577145516Sdarrenr{ 1578145516Sdarrenr#ifdef CSUM_DATA_VALID 1579145516Sdarrenr int manual = 0; 1580145516Sdarrenr u_short sum; 1581145516Sdarrenr ip_t *ip; 1582145516Sdarrenr mb_t *m; 1583145516Sdarrenr 1584145516Sdarrenr if ((fin->fin_flx & FI_NOCKSUM) != 0) 1585145516Sdarrenr return; 1586145516Sdarrenr 1587145516Sdarrenr m = fin->fin_m; 1588145516Sdarrenr if (m == NULL) { 1589145516Sdarrenr manual = 1; 1590145516Sdarrenr goto skipauto; 1591145516Sdarrenr } 1592145516Sdarrenr ip = fin->fin_ip; 1593145516Sdarrenr 1594145516Sdarrenr if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 1595145516Sdarrenr if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 1596145516Sdarrenr sum = m->m_pkthdr.csum_data; 1597145516Sdarrenr else 1598145516Sdarrenr sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, 1599145516Sdarrenr htonl(m->m_pkthdr.csum_data + 1600145516Sdarrenr fin->fin_ip->ip_len + fin->fin_p)); 1601145516Sdarrenr sum ^= 0xffff; 1602145516Sdarrenr if (sum != 0) 1603145516Sdarrenr fin->fin_flx |= FI_BAD; 1604145516Sdarrenr } else 1605145516Sdarrenr manual = 1; 1606145516Sdarrenrskipauto: 1607145516Sdarrenr# ifdef IPFILTER_CKSUM 1608145516Sdarrenr if (manual != 0) 1609145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1610145516Sdarrenr fin->fin_flx |= FI_BAD; 1611145516Sdarrenr# else 1612145516Sdarrenr ; 1613145516Sdarrenr# endif 1614145516Sdarrenr#else 1615145516Sdarrenr# ifdef IPFILTER_CKSUM 1616145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1617145516Sdarrenr fin->fin_flx |= FI_BAD; 1618145516Sdarrenr# endif 1619145516Sdarrenr#endif 1620145516Sdarrenr} 1621145516Sdarrenr 1622145516Sdarrenr 1623145516Sdarrenr#ifdef USE_INET6 1624145516SdarrenrINLINE void fr_checkv6sum(fin) 1625145516Sdarrenrfr_info_t *fin; 1626145516Sdarrenr{ 1627145516Sdarrenr# ifdef IPFILTER_CKSUM 1628145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1629145516Sdarrenr fin->fin_flx |= FI_BAD; 1630145516Sdarrenr# endif 1631145516Sdarrenr} 1632145516Sdarrenr#endif /* USE_INET6 */ 1633145516Sdarrenr 1634145516Sdarrenr 1635145516Sdarrenrsize_t mbufchainlen(m0) 1636145516Sdarrenrstruct mbuf *m0; 1637145516Sdarrenr{ 1638145516Sdarrenr size_t len; 1639145516Sdarrenr 1640145516Sdarrenr if ((m0->m_flags & M_PKTHDR) != 0) { 1641145516Sdarrenr len = m0->m_pkthdr.len; 1642145516Sdarrenr } else { 1643145516Sdarrenr struct mbuf *m; 1644145516Sdarrenr 1645145516Sdarrenr for (m = m0, len = 0; m != NULL; m = m->m_next) 1646145516Sdarrenr len += m->m_len; 1647145516Sdarrenr } 1648145516Sdarrenr return len; 1649145516Sdarrenr} 1650145516Sdarrenr 1651145516Sdarrenr 1652145516Sdarrenr/* ------------------------------------------------------------------------ */ 1653145516Sdarrenr/* Function: fr_pullup */ 1654145516Sdarrenr/* Returns: NULL == pullup failed, else pointer to protocol header */ 1655145516Sdarrenr/* Parameters: m(I) - pointer to buffer where data packet starts */ 1656145516Sdarrenr/* fin(I) - pointer to packet information */ 1657145516Sdarrenr/* len(I) - number of bytes to pullup */ 1658145516Sdarrenr/* */ 1659145516Sdarrenr/* Attempt to move at least len bytes (from the start of the buffer) into a */ 1660145516Sdarrenr/* single buffer for ease of access. Operating system native functions are */ 1661145516Sdarrenr/* used to manage buffers - if necessary. If the entire packet ends up in */ 1662145516Sdarrenr/* a single buffer, set the FI_COALESCE flag even though fr_coalesce() has */ 1663145516Sdarrenr/* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */ 1664145516Sdarrenr/* and ONLY if the pullup succeeds. */ 1665145516Sdarrenr/* */ 1666145516Sdarrenr/* We assume that 'min' is a pointer to a buffer that is part of the chain */ 1667145516Sdarrenr/* of buffers that starts at *fin->fin_mp. */ 1668145516Sdarrenr/* ------------------------------------------------------------------------ */ 1669145516Sdarrenrvoid *fr_pullup(min, fin, len) 1670145516Sdarrenrmb_t *min; 1671145516Sdarrenrfr_info_t *fin; 1672145516Sdarrenrint len; 1673145516Sdarrenr{ 1674145516Sdarrenr int out = fin->fin_out, dpoff, ipoff; 1675145516Sdarrenr mb_t *m = min; 1676145516Sdarrenr char *ip; 1677145516Sdarrenr 1678145516Sdarrenr if (m == NULL) 1679145516Sdarrenr return NULL; 1680145516Sdarrenr 1681145516Sdarrenr ip = (char *)fin->fin_ip; 1682145516Sdarrenr if ((fin->fin_flx & FI_COALESCE) != 0) 1683145516Sdarrenr return ip; 1684145516Sdarrenr 1685145516Sdarrenr ipoff = fin->fin_ipoff; 1686145516Sdarrenr if (fin->fin_dp != NULL) 1687145516Sdarrenr dpoff = (char *)fin->fin_dp - (char *)ip; 1688145516Sdarrenr else 1689145516Sdarrenr dpoff = 0; 1690145516Sdarrenr 1691145516Sdarrenr if (M_LEN(m) < len) { 1692145516Sdarrenr#ifdef MHLEN 1693145516Sdarrenr /* 1694145516Sdarrenr * Assume that M_PKTHDR is set and just work with what is left 1695145516Sdarrenr * rather than check.. 1696145516Sdarrenr * Should not make any real difference, anyway. 1697145516Sdarrenr */ 1698145516Sdarrenr if (len > MHLEN) 1699145516Sdarrenr#else 1700145516Sdarrenr if (len > MLEN) 1701145516Sdarrenr#endif 1702145516Sdarrenr { 1703145516Sdarrenr#ifdef HAVE_M_PULLDOWN 1704145516Sdarrenr if (m_pulldown(m, 0, len, NULL) == NULL) 1705145516Sdarrenr m = NULL; 1706145516Sdarrenr#else 1707145516Sdarrenr FREE_MB_T(*fin->fin_mp); 1708145516Sdarrenr m = NULL; 1709145516Sdarrenr#endif 1710145516Sdarrenr } else 1711145516Sdarrenr { 1712145516Sdarrenr m = m_pullup(m, len); 1713145516Sdarrenr } 1714145516Sdarrenr *fin->fin_mp = m; 1715145516Sdarrenr fin->fin_m = m; 1716145516Sdarrenr if (m == NULL) { 1717145516Sdarrenr ATOMIC_INCL(frstats[out].fr_pull[1]); 1718145516Sdarrenr return NULL; 1719145516Sdarrenr } 1720145516Sdarrenr ip = MTOD(m, char *) + ipoff; 1721145516Sdarrenr } 1722145516Sdarrenr 1723145516Sdarrenr ATOMIC_INCL(frstats[out].fr_pull[0]); 1724145516Sdarrenr fin->fin_ip = (ip_t *)ip; 1725145516Sdarrenr if (fin->fin_dp != NULL) 1726145516Sdarrenr fin->fin_dp = (char *)fin->fin_ip + dpoff; 1727145516Sdarrenr 1728145516Sdarrenr if (len == fin->fin_plen) 1729145516Sdarrenr fin->fin_flx |= FI_COALESCE; 1730145516Sdarrenr return ip; 1731145516Sdarrenr} 1732