ip_fil_freebsd.c revision 151897
1145516Sdarrenr/* $FreeBSD: head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c 151897 2005-10-31 15:41:29Z rwatson $ */ 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"; 10145516Sdarrenrstatic const char rcsid[] = "@(#)Id: ip_fil_freebsd.c,v 2.53.2.25 2005/02/01 03:15:56 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; 128145516Sdarrenripfrwlock_t ipf_mutex, ipf_global, ipf_ipidfrag; 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 150145516Sdarrenr#if (__FreeBSD_version >= 501108) && defined(_KERNEL) 151145516Sdarrenr 152145516Sdarrenrstatic int 153145516Sdarrenrfr_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 154145516Sdarrenr{ 155145516Sdarrenr struct ip *ip = mtod(*mp, struct ip *); 156145516Sdarrenr return fr_check(ip, ip->ip_hl << 2, ifp, (dir == PFIL_OUT), mp); 157145516Sdarrenr} 158145516Sdarrenr 159145516Sdarrenr# ifdef USE_INET6 160145516Sdarrenr# include <netinet/ip6.h> 161145516Sdarrenr 162145516Sdarrenrstatic int 163145516Sdarrenrfr_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 164145516Sdarrenr{ 165145516Sdarrenr return (fr_check(mtod(*mp, struct ip *), sizeof(struct ip6_hdr), 166145516Sdarrenr ifp, (dir == PFIL_OUT), mp)); 167145516Sdarrenr} 168145516Sdarrenr# endif 169145516Sdarrenr#endif /* __FreeBSD_version >= 501108 */ 170145516Sdarrenr#if defined(IPFILTER_LKM) 171145516Sdarrenrint iplidentify(s) 172145516Sdarrenrchar *s; 173145516Sdarrenr{ 174145516Sdarrenr if (strcmp(s, "ipl") == 0) 175145516Sdarrenr return 1; 176145516Sdarrenr return 0; 177145516Sdarrenr} 178145516Sdarrenr#endif /* IPFILTER_LKM */ 179145516Sdarrenr 180145516Sdarrenr 181145516Sdarrenrint iplattach() 182145516Sdarrenr{ 183145516Sdarrenr#ifdef USE_SPL 184145516Sdarrenr int s; 185145516Sdarrenr#endif 186145516Sdarrenr#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011) 187145516Sdarrenr int error = 0; 188145516Sdarrenr# if __FreeBSD_version >= 501108 189145516Sdarrenr struct pfil_head *ph_inet; 190145516Sdarrenr# ifdef USE_INET6 191145516Sdarrenr struct pfil_head *ph_inet6; 192145516Sdarrenr# endif 193145516Sdarrenr# endif 194145516Sdarrenr#endif 195145516Sdarrenr 196145516Sdarrenr SPL_NET(s); 197145516Sdarrenr if (fr_running > 0) { 198145516Sdarrenr SPL_X(s); 199145516Sdarrenr return EBUSY; 200145516Sdarrenr } 201145516Sdarrenr 202145516Sdarrenr MUTEX_INIT(&ipf_rw, "ipf rw mutex"); 203145516Sdarrenr RWLOCK_INIT(&ipf_global, "ipf filter load/unload mutex"); 204145516Sdarrenr MUTEX_INIT(&ipf_timeoutlock, "ipf timeout queue mutex"); 205145516Sdarrenr RWLOCK_INIT(&ipf_mutex, "ipf filter rwlock"); 206145516Sdarrenr RWLOCK_INIT(&ipf_ipidfrag, "ipf IP NAT-Frag rwlock"); 207145516Sdarrenr ipf_locks_done = 1; 208145516Sdarrenr 209145516Sdarrenr if (fr_initialise() < 0) { 210145516Sdarrenr SPL_X(s); 211145516Sdarrenr return EIO; 212145516Sdarrenr } 213145516Sdarrenr 214145516Sdarrenr 215145516Sdarrenr# ifdef NETBSD_PF 216145516Sdarrenr# if __FreeBSD_version >= 500011 217145516Sdarrenr# if __FreeBSD_version >= 501108 218145516Sdarrenr ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); 219145516Sdarrenr# ifdef USE_INET6 220145516Sdarrenr ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); 221145516Sdarrenr# endif 222145516Sdarrenr if (ph_inet == NULL 223145516Sdarrenr# ifdef USE_INET6 224145516Sdarrenr && ph_inet6 == NULL 225145516Sdarrenr# endif 226145516Sdarrenr ) 227145516Sdarrenr return ENODEV; 228145516Sdarrenr 229145516Sdarrenr if (ph_inet != NULL) 230145516Sdarrenr error = pfil_add_hook((void *)fr_check_wrapper, NULL, 231145516Sdarrenr PFIL_IN|PFIL_OUT, ph_inet); 232145516Sdarrenr else 233145516Sdarrenr error = 0; 234145516Sdarrenr# else 235145516Sdarrenr error = pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT, 236145516Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 237145516Sdarrenr# endif 238145516Sdarrenr if (error) { 239145516Sdarrenr# ifdef USE_INET6 240145516Sdarrenr goto pfil_error; 241145516Sdarrenr# else 242145516Sdarrenr fr_deinitialise(); 243145516Sdarrenr SPL_X(s); 244145516Sdarrenr return error; 245145516Sdarrenr# endif 246145516Sdarrenr } 247145516Sdarrenr# else 248145516Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT); 249145516Sdarrenr# endif 250145516Sdarrenr# ifdef USE_INET6 251145516Sdarrenr# if __FreeBSD_version >= 501108 252145516Sdarrenr if (ph_inet6 != NULL) 253145516Sdarrenr error = pfil_add_hook((void *)fr_check_wrapper6, NULL, 254145516Sdarrenr PFIL_IN|PFIL_OUT, ph_inet6); 255145516Sdarrenr else 256145516Sdarrenr error = 0; 257145516Sdarrenr if (error) { 258145516Sdarrenr pfil_remove_hook((void *)fr_check_wrapper6, NULL, 259145516Sdarrenr PFIL_IN|PFIL_OUT, ph_inet6); 260145516Sdarrenr# else 261145516Sdarrenr error = pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT, 262145516Sdarrenr &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 263145516Sdarrenr if (error) { 264145516Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT, 265145516Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 266145516Sdarrenr# endif 267145516Sdarrenrpfil_error: 268145516Sdarrenr fr_deinitialise(); 269145516Sdarrenr SPL_X(s); 270145516Sdarrenr return error; 271145516Sdarrenr } 272145516Sdarrenr# endif 273145516Sdarrenr# endif 274145516Sdarrenr if (fr_checkp != fr_check) { 275145516Sdarrenr fr_savep = fr_checkp; 276145516Sdarrenr fr_checkp = fr_check; 277145516Sdarrenr } 278145516Sdarrenr 279145516Sdarrenr bzero((char *)frcache, sizeof(frcache)); 280145516Sdarrenr fr_running = 1; 281145516Sdarrenr 282145516Sdarrenr if (fr_control_forwarding & 1) 283145516Sdarrenr ipforwarding = 1; 284145516Sdarrenr 285145516Sdarrenr SPL_X(s); 286145516Sdarrenr#if (__FreeBSD_version >= 300000) 287145516Sdarrenr fr_slowtimer_ch = timeout(fr_slowtimer, NULL, 288145516Sdarrenr (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 289145516Sdarrenr#else 290145516Sdarrenr timeout(fr_slowtimer, NULL, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 291145516Sdarrenr#endif 292145516Sdarrenr return 0; 293145516Sdarrenr} 294145516Sdarrenr 295145516Sdarrenr 296145516Sdarrenr/* 297145516Sdarrenr * Disable the filter by removing the hooks from the IP input/output 298145516Sdarrenr * stream. 299145516Sdarrenr */ 300145516Sdarrenrint ipldetach() 301145516Sdarrenr{ 302145516Sdarrenr#ifdef USE_SPL 303145516Sdarrenr int s; 304145516Sdarrenr#endif 305145516Sdarrenr#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011) 306145516Sdarrenr int error = 0; 307145516Sdarrenr# if __FreeBSD_version >= 501108 308145516Sdarrenr struct pfil_head *ph_inet; 309145516Sdarrenr# ifdef USE_INET6 310145516Sdarrenr struct pfil_head *ph_inet6; 311145516Sdarrenr# endif 312145516Sdarrenr# endif 313145516Sdarrenr#endif 314145516Sdarrenr 315145516Sdarrenr if (fr_control_forwarding & 2) 316145516Sdarrenr ipforwarding = 0; 317145516Sdarrenr 318145516Sdarrenr SPL_NET(s); 319145516Sdarrenr 320145516Sdarrenr#if (__FreeBSD_version >= 300000) 321145516Sdarrenr if (fr_slowtimer_ch.callout != NULL) 322145516Sdarrenr untimeout(fr_slowtimer, NULL, fr_slowtimer_ch); 323145516Sdarrenr bzero(&fr_slowtimer_ch, sizeof(fr_slowtimer_ch)); 324145516Sdarrenr#else 325145516Sdarrenr untimeout(fr_slowtimer, NULL); 326145516Sdarrenr#endif /* FreeBSD */ 327145516Sdarrenr 328145516Sdarrenr#ifndef NETBSD_PF 329145516Sdarrenr if (fr_checkp != NULL) 330145516Sdarrenr fr_checkp = fr_savep; 331145516Sdarrenr fr_savep = NULL; 332145516Sdarrenr#endif 333145516Sdarrenr 334145516Sdarrenr#ifdef NETBSD_PF 335145516Sdarrenr# if (__FreeBSD_version >= 500011) 336145516Sdarrenr# if (__FreeBSD_version >= 501108) 337145516Sdarrenr ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); 338145516Sdarrenr if (ph_inet != NULL) 339145516Sdarrenr error = pfil_remove_hook((void *)fr_check_wrapper, NULL, 340145516Sdarrenr PFIL_IN|PFIL_OUT, ph_inet); 341145516Sdarrenr else 342145516Sdarrenr error = 0; 343145516Sdarrenr# else 344145516Sdarrenr error = pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT, 345145516Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 346145516Sdarrenr# endif 347145516Sdarrenr if (error) { 348145516Sdarrenr SPL_X(s); 349145516Sdarrenr return error; 350145516Sdarrenr } 351145516Sdarrenr# else 352145516Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT); 353145516Sdarrenr# endif 354145516Sdarrenr# ifdef USE_INET6 355145516Sdarrenr# if (__FreeBSD_version >= 501108) 356145516Sdarrenr ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); 357145516Sdarrenr if (ph_inet6 != NULL) 358145516Sdarrenr error = pfil_remove_hook((void *)fr_check_wrapper6, NULL, 359145516Sdarrenr PFIL_IN|PFIL_OUT, ph_inet6); 360145516Sdarrenr else 361145516Sdarrenr error = 0; 362145516Sdarrenr# else 363145516Sdarrenr error = pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT, 364145516Sdarrenr &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 365145516Sdarrenr# endif 366145516Sdarrenr if (error) { 367145516Sdarrenr SPL_X(s); 368145516Sdarrenr return error; 369145516Sdarrenr } 370145516Sdarrenr# endif 371145516Sdarrenr#endif 372145516Sdarrenr fr_deinitialise(); 373145516Sdarrenr 374145516Sdarrenr fr_running = -2; 375145516Sdarrenr 376145516Sdarrenr (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE); 377145516Sdarrenr (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE); 378145516Sdarrenr 379145516Sdarrenr if (ipf_locks_done == 1) { 380145516Sdarrenr MUTEX_DESTROY(&ipf_timeoutlock); 381145516Sdarrenr MUTEX_DESTROY(&ipf_rw); 382145516Sdarrenr RW_DESTROY(&ipf_mutex); 383145516Sdarrenr RW_DESTROY(&ipf_ipidfrag); 384145516Sdarrenr RW_DESTROY(&ipf_global); 385145516Sdarrenr ipf_locks_done = 0; 386145516Sdarrenr } 387145516Sdarrenr 388145516Sdarrenr SPL_X(s); 389145516Sdarrenr 390145516Sdarrenr return 0; 391145516Sdarrenr} 392145516Sdarrenr 393145516Sdarrenr 394145516Sdarrenr/* 395145516Sdarrenr * Filter ioctl interface. 396145516Sdarrenr */ 397145516Sdarrenrint iplioctl(dev, cmd, data, mode 398145516Sdarrenr# if defined(_KERNEL) && ((BSD >= 199506) || (__FreeBSD_version >= 220000)) 399145516Sdarrenr, p) 400145516Sdarrenr# if (__FreeBSD_version >= 500024) 401145516Sdarrenrstruct thread *p; 402145516Sdarrenr# else 403145516Sdarrenrstruct proc *p; 404145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 405145516Sdarrenr# else 406145516Sdarrenr) 407145516Sdarrenr# endif 408145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 409145516Sdarrenrstruct cdev *dev; 410145516Sdarrenr#else 411145516Sdarrenrdev_t dev; 412145516Sdarrenr#endif 413145516Sdarrenrioctlcmd_t cmd; 414145516Sdarrenrcaddr_t data; 415145516Sdarrenrint mode; 416145516Sdarrenr{ 417145516Sdarrenr#ifdef USE_SPL 418145516Sdarrenr int s; 419145516Sdarrenr#endif 420145516Sdarrenr int error = 0, unit = 0, tmp; 421145516Sdarrenr friostat_t fio; 422145516Sdarrenr 423145516Sdarrenr#if (BSD >= 199306) && defined(_KERNEL) 424145516Sdarrenr if ((securelevel >= 2) && (mode & FWRITE)) 425145516Sdarrenr return EPERM; 426145516Sdarrenr#endif 427145516Sdarrenr 428145516Sdarrenr unit = GET_MINOR(dev); 429145516Sdarrenr if ((IPL_LOGMAX < unit) || (unit < 0)) 430145516Sdarrenr return ENXIO; 431145516Sdarrenr 432145516Sdarrenr if (fr_running <= 0) { 433145516Sdarrenr if (unit != IPL_LOGIPF) 434145516Sdarrenr return EIO; 435145516Sdarrenr if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET && 436145516Sdarrenr cmd != SIOCIPFSET && cmd != SIOCFRENB && 437145516Sdarrenr cmd != SIOCGETFS && cmd != SIOCGETFF) 438145516Sdarrenr return EIO; 439145516Sdarrenr } 440145516Sdarrenr 441145516Sdarrenr SPL_NET(s); 442145516Sdarrenr 443145516Sdarrenr error = fr_ioctlswitch(unit, data, cmd, mode); 444145516Sdarrenr if (error != -1) { 445145516Sdarrenr SPL_X(s); 446145516Sdarrenr return error; 447145516Sdarrenr } 448145516Sdarrenr error = 0; 449145516Sdarrenr 450145516Sdarrenr switch (cmd) 451145516Sdarrenr { 452145516Sdarrenr case FIONREAD : 453145516Sdarrenr#ifdef IPFILTER_LOG 454145516Sdarrenr BCOPYOUT(&iplused[IPL_LOGIPF], (caddr_t)data, 455145516Sdarrenr sizeof(iplused[IPL_LOGIPF])); 456145516Sdarrenr#endif 457145516Sdarrenr break; 458145516Sdarrenr case SIOCFRENB : 459145516Sdarrenr if (!(mode & FWRITE)) 460145516Sdarrenr error = EPERM; 461145516Sdarrenr else { 462145516Sdarrenr BCOPYIN(data, &tmp, sizeof(tmp)); 463145516Sdarrenr if (tmp) { 464145516Sdarrenr if (fr_running > 0) 465145516Sdarrenr error = 0; 466145516Sdarrenr else 467145516Sdarrenr error = iplattach(); 468145516Sdarrenr if (error == 0) 469145516Sdarrenr fr_running = 1; 470145516Sdarrenr else 471145516Sdarrenr (void) ipldetach(); 472145516Sdarrenr } else { 473145516Sdarrenr error = ipldetach(); 474145516Sdarrenr if (error == 0) 475145516Sdarrenr fr_running = -1; 476145516Sdarrenr } 477145516Sdarrenr } 478145516Sdarrenr break; 479145516Sdarrenr case SIOCIPFSET : 480145516Sdarrenr if (!(mode & FWRITE)) { 481145516Sdarrenr error = EPERM; 482145516Sdarrenr break; 483145516Sdarrenr } 484145516Sdarrenr case SIOCIPFGETNEXT : 485145516Sdarrenr case SIOCIPFGET : 486145516Sdarrenr error = fr_ipftune(cmd, data); 487145516Sdarrenr break; 488145516Sdarrenr case SIOCSETFF : 489145516Sdarrenr if (!(mode & FWRITE)) 490145516Sdarrenr error = EPERM; 491145516Sdarrenr else 492145516Sdarrenr BCOPYIN(data, &fr_flags, sizeof(fr_flags)); 493145516Sdarrenr break; 494145516Sdarrenr case SIOCGETFF : 495145516Sdarrenr BCOPYOUT(&fr_flags, data, sizeof(fr_flags)); 496145516Sdarrenr break; 497145516Sdarrenr case SIOCFUNCL : 498145516Sdarrenr error = fr_resolvefunc(data); 499145516Sdarrenr break; 500145516Sdarrenr case SIOCINAFR : 501145516Sdarrenr case SIOCRMAFR : 502145516Sdarrenr case SIOCADAFR : 503145516Sdarrenr case SIOCZRLST : 504145516Sdarrenr if (!(mode & FWRITE)) 505145516Sdarrenr error = EPERM; 506145516Sdarrenr else 507145516Sdarrenr error = frrequest(unit, cmd, data, fr_active, 1); 508145516Sdarrenr break; 509145516Sdarrenr case SIOCINIFR : 510145516Sdarrenr case SIOCRMIFR : 511145516Sdarrenr case SIOCADIFR : 512145516Sdarrenr if (!(mode & FWRITE)) 513145516Sdarrenr error = EPERM; 514145516Sdarrenr else 515145516Sdarrenr error = frrequest(unit, cmd, data, 1 - fr_active, 1); 516145516Sdarrenr break; 517145516Sdarrenr case SIOCSWAPA : 518145516Sdarrenr if (!(mode & FWRITE)) 519145516Sdarrenr error = EPERM; 520145516Sdarrenr else { 521145516Sdarrenr bzero((char *)frcache, sizeof(frcache[0]) * 2); 522145516Sdarrenr *(u_int *)data = fr_active; 523145516Sdarrenr fr_active = 1 - fr_active; 524145516Sdarrenr } 525145516Sdarrenr break; 526145516Sdarrenr case SIOCGETFS : 527145516Sdarrenr fr_getstat(&fio); 528145516Sdarrenr error = fr_outobj(data, &fio, IPFOBJ_IPFSTAT); 529145516Sdarrenr break; 530145516Sdarrenr case SIOCFRZST : 531145516Sdarrenr if (!(mode & FWRITE)) 532145516Sdarrenr error = EPERM; 533145516Sdarrenr else 534145516Sdarrenr error = fr_zerostats(data); 535145516Sdarrenr break; 536145516Sdarrenr case SIOCIPFFL : 537145516Sdarrenr if (!(mode & FWRITE)) 538145516Sdarrenr error = EPERM; 539145516Sdarrenr else { 540145516Sdarrenr BCOPYIN(data, &tmp, sizeof(tmp)); 541145516Sdarrenr tmp = frflush(unit, 4, tmp); 542145516Sdarrenr BCOPYOUT(&tmp, data, sizeof(tmp)); 543145516Sdarrenr } 544145516Sdarrenr break; 545145516Sdarrenr#ifdef USE_INET6 546145516Sdarrenr case SIOCIPFL6 : 547145516Sdarrenr if (!(mode & FWRITE)) 548145516Sdarrenr error = EPERM; 549145516Sdarrenr else { 550145516Sdarrenr BCOPYIN(data, &tmp, sizeof(tmp)); 551145516Sdarrenr tmp = frflush(unit, 6, tmp); 552145516Sdarrenr BCOPYOUT(&tmp, data, sizeof(tmp)); 553145516Sdarrenr } 554145516Sdarrenr break; 555145516Sdarrenr#endif 556145516Sdarrenr case SIOCSTLCK : 557145516Sdarrenr BCOPYIN(data, &tmp, sizeof(tmp)); 558145516Sdarrenr fr_state_lock = tmp; 559145516Sdarrenr fr_nat_lock = tmp; 560145516Sdarrenr fr_frag_lock = tmp; 561145516Sdarrenr fr_auth_lock = tmp; 562145516Sdarrenr break; 563145516Sdarrenr#ifdef IPFILTER_LOG 564145516Sdarrenr case SIOCIPFFB : 565145516Sdarrenr if (!(mode & FWRITE)) 566145516Sdarrenr error = EPERM; 567145516Sdarrenr else 568145516Sdarrenr *(int *)data = ipflog_clear(unit); 569145516Sdarrenr break; 570145516Sdarrenr#endif /* IPFILTER_LOG */ 571145516Sdarrenr case SIOCGFRST : 572145516Sdarrenr error = fr_outobj(data, fr_fragstats(), IPFOBJ_FRAGSTAT); 573145516Sdarrenr break; 574145516Sdarrenr case SIOCFRSYN : 575145516Sdarrenr if (!(mode & FWRITE)) 576145516Sdarrenr error = EPERM; 577145516Sdarrenr else { 578145516Sdarrenr frsync(NULL); 579145516Sdarrenr } 580145516Sdarrenr break; 581145516Sdarrenr default : 582145516Sdarrenr error = EINVAL; 583145516Sdarrenr break; 584145516Sdarrenr } 585145516Sdarrenr SPL_X(s); 586145516Sdarrenr return error; 587145516Sdarrenr} 588145516Sdarrenr 589145516Sdarrenr 590145516Sdarrenr#if 0 591145516Sdarrenrvoid fr_forgetifp(ifp) 592145516Sdarrenrvoid *ifp; 593145516Sdarrenr{ 594145516Sdarrenr register frentry_t *f; 595145516Sdarrenr 596145516Sdarrenr WRITE_ENTER(&ipf_mutex); 597145516Sdarrenr for (f = ipacct[0][fr_active]; (f != NULL); f = f->fr_next) 598145516Sdarrenr if (f->fr_ifa == ifp) 599145516Sdarrenr f->fr_ifa = (void *)-1; 600145516Sdarrenr for (f = ipacct[1][fr_active]; (f != NULL); f = f->fr_next) 601145516Sdarrenr if (f->fr_ifa == ifp) 602145516Sdarrenr f->fr_ifa = (void *)-1; 603145516Sdarrenr for (f = ipfilter[0][fr_active]; (f != NULL); f = f->fr_next) 604145516Sdarrenr if (f->fr_ifa == ifp) 605145516Sdarrenr f->fr_ifa = (void *)-1; 606145516Sdarrenr for (f = ipfilter[1][fr_active]; (f != NULL); f = f->fr_next) 607145516Sdarrenr if (f->fr_ifa == ifp) 608145516Sdarrenr f->fr_ifa = (void *)-1; 609145516Sdarrenr#ifdef USE_INET6 610145516Sdarrenr for (f = ipacct6[0][fr_active]; (f != NULL); f = f->fr_next) 611145516Sdarrenr if (f->fr_ifa == ifp) 612145516Sdarrenr f->fr_ifa = (void *)-1; 613145516Sdarrenr for (f = ipacct6[1][fr_active]; (f != NULL); f = f->fr_next) 614145516Sdarrenr if (f->fr_ifa == ifp) 615145516Sdarrenr f->fr_ifa = (void *)-1; 616145516Sdarrenr for (f = ipfilter6[0][fr_active]; (f != NULL); f = f->fr_next) 617145516Sdarrenr if (f->fr_ifa == ifp) 618145516Sdarrenr f->fr_ifa = (void *)-1; 619145516Sdarrenr for (f = ipfilter6[1][fr_active]; (f != NULL); f = f->fr_next) 620145516Sdarrenr if (f->fr_ifa == ifp) 621145516Sdarrenr f->fr_ifa = (void *)-1; 622145516Sdarrenr#endif 623145516Sdarrenr RWLOCK_EXIT(&ipf_mutex); 624145516Sdarrenr fr_natsync(ifp); 625145516Sdarrenr} 626145516Sdarrenr#endif 627145516Sdarrenr 628145516Sdarrenr 629145516Sdarrenr/* 630145516Sdarrenr * routines below for saving IP headers to buffer 631145516Sdarrenr */ 632145516Sdarrenrint iplopen(dev, flags 633145516Sdarrenr#if ((BSD >= 199506) || (__FreeBSD_version >= 220000)) && defined(_KERNEL) 634145516Sdarrenr, devtype, p) 635145516Sdarrenrint devtype; 636145516Sdarrenr# if (__FreeBSD_version >= 500024) 637145516Sdarrenrstruct thread *p; 638145516Sdarrenr# else 639145516Sdarrenrstruct proc *p; 640145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 641145516Sdarrenr#else 642145516Sdarrenr) 643145516Sdarrenr#endif 644145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 645145516Sdarrenrstruct cdev *dev; 646145516Sdarrenr#else 647145516Sdarrenrdev_t dev; 648145516Sdarrenr#endif 649145516Sdarrenrint flags; 650145516Sdarrenr{ 651145516Sdarrenr u_int min = GET_MINOR(dev); 652145516Sdarrenr 653145516Sdarrenr if (IPL_LOGMAX < min) 654145516Sdarrenr min = ENXIO; 655145516Sdarrenr else 656145516Sdarrenr min = 0; 657145516Sdarrenr return min; 658145516Sdarrenr} 659145516Sdarrenr 660145516Sdarrenr 661145516Sdarrenrint iplclose(dev, flags 662145516Sdarrenr#if ((BSD >= 199506) || (__FreeBSD_version >= 220000)) && defined(_KERNEL) 663145516Sdarrenr, devtype, p) 664145516Sdarrenrint devtype; 665145516Sdarrenr# if (__FreeBSD_version >= 500024) 666145516Sdarrenrstruct thread *p; 667145516Sdarrenr# else 668145516Sdarrenrstruct proc *p; 669145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 670145516Sdarrenr#else 671145516Sdarrenr) 672145516Sdarrenr#endif 673145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 674145516Sdarrenrstruct cdev *dev; 675145516Sdarrenr#else 676145516Sdarrenrdev_t dev; 677145516Sdarrenr#endif 678145516Sdarrenrint flags; 679145516Sdarrenr{ 680145516Sdarrenr u_int min = GET_MINOR(dev); 681145516Sdarrenr 682145516Sdarrenr if (IPL_LOGMAX < min) 683145516Sdarrenr min = ENXIO; 684145516Sdarrenr else 685145516Sdarrenr min = 0; 686145516Sdarrenr return min; 687145516Sdarrenr} 688145516Sdarrenr 689145516Sdarrenr/* 690145516Sdarrenr * iplread/ipllog 691145516Sdarrenr * both of these must operate with at least splnet() lest they be 692145516Sdarrenr * called during packet processing and cause an inconsistancy to appear in 693145516Sdarrenr * the filter lists. 694145516Sdarrenr */ 695145516Sdarrenr#if (BSD >= 199306) 696145516Sdarrenrint iplread(dev, uio, ioflag) 697145516Sdarrenrint ioflag; 698145516Sdarrenr#else 699145516Sdarrenrint iplread(dev, uio) 700145516Sdarrenr#endif 701145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 702145516Sdarrenrstruct cdev *dev; 703145516Sdarrenr#else 704145516Sdarrenrdev_t dev; 705145516Sdarrenr#endif 706145516Sdarrenrregister struct uio *uio; 707145516Sdarrenr{ 708145516Sdarrenr 709145516Sdarrenr# ifdef IPFILTER_SYNC 710145516Sdarrenr if (GET_MINOR(dev) == IPL_LOGSYNC) 711145516Sdarrenr return ipfsync_read(uio); 712145516Sdarrenr# endif 713145516Sdarrenr 714145516Sdarrenr#ifdef IPFILTER_LOG 715145516Sdarrenr return ipflog_read(GET_MINOR(dev), uio); 716145516Sdarrenr#else 717145516Sdarrenr return ENXIO; 718145516Sdarrenr#endif 719145516Sdarrenr} 720145516Sdarrenr 721145516Sdarrenr 722145516Sdarrenr/* 723145516Sdarrenr * iplwrite 724145516Sdarrenr * both of these must operate with at least splnet() lest they be 725145516Sdarrenr * called during packet processing and cause an inconsistancy to appear in 726145516Sdarrenr * the filter lists. 727145516Sdarrenr */ 728145516Sdarrenr#if (BSD >= 199306) 729145516Sdarrenrint iplwrite(dev, uio, ioflag) 730145516Sdarrenrint ioflag; 731145516Sdarrenr#else 732145516Sdarrenrint iplwrite(dev, uio) 733145516Sdarrenr#endif 734145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 735145516Sdarrenrstruct cdev *dev; 736145516Sdarrenr#else 737145516Sdarrenrdev_t dev; 738145516Sdarrenr#endif 739145516Sdarrenrregister struct uio *uio; 740145516Sdarrenr{ 741145516Sdarrenr 742145516Sdarrenr#ifdef IPFILTER_SYNC 743145516Sdarrenr if (GET_MINOR(dev) == IPL_LOGSYNC) 744145516Sdarrenr return ipfsync_write(uio); 745145516Sdarrenr#endif 746145516Sdarrenr return ENXIO; 747145516Sdarrenr} 748145516Sdarrenr 749145516Sdarrenr 750145516Sdarrenr/* 751145516Sdarrenr * fr_send_reset - this could conceivably be a call to tcp_respond(), but that 752145516Sdarrenr * requires a large amount of setting up and isn't any more efficient. 753145516Sdarrenr */ 754145516Sdarrenrint fr_send_reset(fin) 755145516Sdarrenrfr_info_t *fin; 756145516Sdarrenr{ 757145516Sdarrenr struct tcphdr *tcp, *tcp2; 758145516Sdarrenr int tlen = 0, hlen; 759145516Sdarrenr struct mbuf *m; 760145516Sdarrenr#ifdef USE_INET6 761145516Sdarrenr ip6_t *ip6; 762145516Sdarrenr#endif 763145516Sdarrenr ip_t *ip; 764145516Sdarrenr 765145516Sdarrenr tcp = fin->fin_dp; 766145516Sdarrenr if (tcp->th_flags & TH_RST) 767145516Sdarrenr return -1; /* feedback loop */ 768145516Sdarrenr 769145516Sdarrenr#ifndef IPFILTER_CKSUM 770145516Sdarrenr if (fr_checkl4sum(fin) == -1) 771145516Sdarrenr return -1; 772145516Sdarrenr#endif 773145516Sdarrenr 774145516Sdarrenr tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) + 775145516Sdarrenr ((tcp->th_flags & TH_SYN) ? 1 : 0) + 776145516Sdarrenr ((tcp->th_flags & TH_FIN) ? 1 : 0); 777145516Sdarrenr 778145516Sdarrenr#ifdef USE_INET6 779145516Sdarrenr hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t); 780145516Sdarrenr#else 781145516Sdarrenr hlen = sizeof(ip_t); 782145516Sdarrenr#endif 783145516Sdarrenr#ifdef MGETHDR 784145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 785145516Sdarrenr#else 786145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 787145516Sdarrenr#endif 788145516Sdarrenr if (m == NULL) 789145516Sdarrenr return -1; 790145516Sdarrenr if (sizeof(*tcp2) + hlen > MLEN) { 791145516Sdarrenr MCLGET(m, M_DONTWAIT); 792145516Sdarrenr if ((m->m_flags & M_EXT) == 0) { 793145516Sdarrenr FREE_MB_T(m); 794145516Sdarrenr return -1; 795145516Sdarrenr } 796145516Sdarrenr } 797145516Sdarrenr 798145516Sdarrenr m->m_len = sizeof(*tcp2) + hlen; 799145516Sdarrenr#if (BSD >= 199103) 800145516Sdarrenr m->m_data += max_linkhdr; 801145516Sdarrenr m->m_pkthdr.len = m->m_len; 802145516Sdarrenr m->m_pkthdr.rcvif = (struct ifnet *)0; 803145516Sdarrenr#endif 804145516Sdarrenr ip = mtod(m, struct ip *); 805145516Sdarrenr bzero((char *)ip, hlen); 806145516Sdarrenr#ifdef USE_INET6 807145516Sdarrenr ip6 = (ip6_t *)ip; 808145516Sdarrenr#endif 809145516Sdarrenr tcp2 = (struct tcphdr *)((char *)ip + hlen); 810145516Sdarrenr tcp2->th_sport = tcp->th_dport; 811145516Sdarrenr tcp2->th_dport = tcp->th_sport; 812145516Sdarrenr 813145516Sdarrenr if (tcp->th_flags & TH_ACK) { 814145516Sdarrenr tcp2->th_seq = tcp->th_ack; 815145516Sdarrenr tcp2->th_flags = TH_RST; 816145516Sdarrenr tcp2->th_ack = 0; 817145516Sdarrenr } else { 818145516Sdarrenr tcp2->th_seq = 0; 819145516Sdarrenr tcp2->th_ack = ntohl(tcp->th_seq); 820145516Sdarrenr tcp2->th_ack += tlen; 821145516Sdarrenr tcp2->th_ack = htonl(tcp2->th_ack); 822145516Sdarrenr tcp2->th_flags = TH_RST|TH_ACK; 823145516Sdarrenr } 824145516Sdarrenr TCP_X2_A(tcp2, 0); 825145516Sdarrenr TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2); 826145516Sdarrenr tcp2->th_win = tcp->th_win; 827145516Sdarrenr tcp2->th_sum = 0; 828145516Sdarrenr tcp2->th_urp = 0; 829145516Sdarrenr 830145516Sdarrenr#ifdef USE_INET6 831145516Sdarrenr if (fin->fin_v == 6) { 832145516Sdarrenr ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 833145516Sdarrenr ip6->ip6_plen = htons(sizeof(struct tcphdr)); 834145516Sdarrenr ip6->ip6_nxt = IPPROTO_TCP; 835145516Sdarrenr ip6->ip6_hlim = 0; 836145516Sdarrenr ip6->ip6_src = fin->fin_dst6; 837145516Sdarrenr ip6->ip6_dst = fin->fin_src6; 838145516Sdarrenr tcp2->th_sum = in6_cksum(m, IPPROTO_TCP, 839145516Sdarrenr sizeof(*ip6), sizeof(*tcp2)); 840145516Sdarrenr return fr_send_ip(fin, m, &m); 841145516Sdarrenr } 842145516Sdarrenr#endif 843145516Sdarrenr ip->ip_p = IPPROTO_TCP; 844145516Sdarrenr ip->ip_len = htons(sizeof(struct tcphdr)); 845145516Sdarrenr ip->ip_src.s_addr = fin->fin_daddr; 846145516Sdarrenr ip->ip_dst.s_addr = fin->fin_saddr; 847145516Sdarrenr tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2)); 848145516Sdarrenr ip->ip_len = hlen + sizeof(*tcp2); 849145516Sdarrenr return fr_send_ip(fin, m, &m); 850145516Sdarrenr} 851145516Sdarrenr 852145516Sdarrenr 853145516Sdarrenrstatic int fr_send_ip(fin, m, mpp) 854145516Sdarrenrfr_info_t *fin; 855145516Sdarrenrmb_t *m, **mpp; 856145516Sdarrenr{ 857145516Sdarrenr fr_info_t fnew; 858145516Sdarrenr ip_t *ip, *oip; 859145516Sdarrenr int hlen; 860145516Sdarrenr 861145516Sdarrenr ip = mtod(m, ip_t *); 862145516Sdarrenr bzero((char *)&fnew, sizeof(fnew)); 863145516Sdarrenr 864145516Sdarrenr IP_V_A(ip, fin->fin_v); 865145516Sdarrenr switch (fin->fin_v) 866145516Sdarrenr { 867145516Sdarrenr case 4 : 868145516Sdarrenr fnew.fin_v = 4; 869145516Sdarrenr oip = fin->fin_ip; 870145516Sdarrenr IP_HL_A(ip, sizeof(*oip) >> 2); 871145516Sdarrenr ip->ip_tos = oip->ip_tos; 872145516Sdarrenr ip->ip_id = fin->fin_ip->ip_id; 873145516Sdarrenr#if (__FreeBSD_version > 460000) 874145516Sdarrenr ip->ip_off = path_mtu_discovery ? IP_DF : 0; 875145516Sdarrenr#else 876145516Sdarrenr ip->ip_off = 0; 877145516Sdarrenr#endif 878145516Sdarrenr ip->ip_ttl = ip_defttl; 879145516Sdarrenr ip->ip_sum = 0; 880145516Sdarrenr hlen = sizeof(*oip); 881145516Sdarrenr break; 882145516Sdarrenr#ifdef USE_INET6 883145516Sdarrenr case 6 : 884145516Sdarrenr { 885145516Sdarrenr ip6_t *ip6 = (ip6_t *)ip; 886145516Sdarrenr 887145516Sdarrenr ip6->ip6_vfc = 0x60; 888145516Sdarrenr ip6->ip6_hlim = IPDEFTTL; 889145516Sdarrenr 890145516Sdarrenr fnew.fin_v = 6; 891145516Sdarrenr hlen = sizeof(*ip6); 892145516Sdarrenr break; 893145516Sdarrenr } 894145516Sdarrenr#endif 895145516Sdarrenr default : 896145516Sdarrenr return EINVAL; 897145516Sdarrenr } 898145516Sdarrenr#ifdef IPSEC 899145516Sdarrenr m->m_pkthdr.rcvif = NULL; 900145516Sdarrenr#endif 901145516Sdarrenr 902145516Sdarrenr fnew.fin_ifp = fin->fin_ifp; 903145516Sdarrenr fnew.fin_flx = FI_NOCKSUM; 904145516Sdarrenr fnew.fin_m = m; 905145516Sdarrenr fnew.fin_ip = ip; 906145516Sdarrenr fnew.fin_mp = mpp; 907145516Sdarrenr fnew.fin_hlen = hlen; 908145516Sdarrenr fnew.fin_dp = (char *)ip + hlen; 909145516Sdarrenr (void) fr_makefrip(hlen, ip, &fnew); 910145516Sdarrenr 911145516Sdarrenr return fr_fastroute(m, mpp, &fnew, NULL); 912145516Sdarrenr} 913145516Sdarrenr 914145516Sdarrenr 915145516Sdarrenrint fr_send_icmp_err(type, fin, dst) 916145516Sdarrenrint type; 917145516Sdarrenrfr_info_t *fin; 918145516Sdarrenrint dst; 919145516Sdarrenr{ 920145516Sdarrenr int err, hlen, xtra, iclen, ohlen, avail, code; 921145516Sdarrenr struct in_addr dst4; 922145516Sdarrenr struct icmp *icmp; 923145516Sdarrenr struct mbuf *m; 924145516Sdarrenr void *ifp; 925145516Sdarrenr#ifdef USE_INET6 926145516Sdarrenr ip6_t *ip6; 927145516Sdarrenr struct in6_addr dst6; 928145516Sdarrenr#endif 929145516Sdarrenr ip_t *ip, *ip2; 930145516Sdarrenr 931145516Sdarrenr if ((type < 0) || (type > ICMP_MAXTYPE)) 932145516Sdarrenr return -1; 933145516Sdarrenr 934145516Sdarrenr code = fin->fin_icode; 935145516Sdarrenr#ifdef USE_INET6 936145516Sdarrenr if ((code < 0) || (code > sizeof(icmptoicmp6unreach)/sizeof(int))) 937145516Sdarrenr return -1; 938145516Sdarrenr#endif 939145516Sdarrenr 940145516Sdarrenr#ifndef IPFILTER_CKSUM 941145516Sdarrenr if (fr_checkl4sum(fin) == -1) 942145516Sdarrenr return -1; 943145516Sdarrenr#endif 944145516Sdarrenr#ifdef MGETHDR 945145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 946145516Sdarrenr#else 947145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 948145516Sdarrenr#endif 949145516Sdarrenr if (m == NULL) 950145516Sdarrenr return -1; 951145516Sdarrenr avail = MHLEN; 952145516Sdarrenr 953145516Sdarrenr xtra = 0; 954145516Sdarrenr hlen = 0; 955145516Sdarrenr ohlen = 0; 956145516Sdarrenr ifp = fin->fin_ifp; 957145516Sdarrenr if (fin->fin_v == 4) { 958145516Sdarrenr if ((fin->fin_p == IPPROTO_ICMP) && 959145516Sdarrenr !(fin->fin_flx & FI_SHORT)) 960145516Sdarrenr switch (ntohs(fin->fin_data[0]) >> 8) 961145516Sdarrenr { 962145516Sdarrenr case ICMP_ECHO : 963145516Sdarrenr case ICMP_TSTAMP : 964145516Sdarrenr case ICMP_IREQ : 965145516Sdarrenr case ICMP_MASKREQ : 966145516Sdarrenr break; 967145516Sdarrenr default : 968145516Sdarrenr FREE_MB_T(m); 969145516Sdarrenr return 0; 970145516Sdarrenr } 971145516Sdarrenr 972145516Sdarrenr if (dst == 0) { 973145516Sdarrenr if (fr_ifpaddr(4, FRI_NORMAL, ifp, 974145516Sdarrenr &dst4, NULL) == -1) { 975145516Sdarrenr FREE_MB_T(m); 976145516Sdarrenr return -1; 977145516Sdarrenr } 978145516Sdarrenr } else 979145516Sdarrenr dst4.s_addr = fin->fin_daddr; 980145516Sdarrenr 981145516Sdarrenr hlen = sizeof(ip_t); 982145516Sdarrenr ohlen = fin->fin_hlen; 983145516Sdarrenr if (fin->fin_hlen < fin->fin_plen) 984145516Sdarrenr xtra = MIN(fin->fin_dlen, 8); 985145516Sdarrenr else 986145516Sdarrenr xtra = 0; 987145516Sdarrenr } 988145516Sdarrenr 989145516Sdarrenr#ifdef USE_INET6 990145516Sdarrenr else if (fin->fin_v == 6) { 991145516Sdarrenr hlen = sizeof(ip6_t); 992145516Sdarrenr ohlen = sizeof(ip6_t); 993145516Sdarrenr type = icmptoicmp6types[type]; 994145516Sdarrenr if (type == ICMP6_DST_UNREACH) 995145516Sdarrenr code = icmptoicmp6unreach[code]; 996145516Sdarrenr 997145516Sdarrenr if (hlen + sizeof(*icmp) + max_linkhdr + 998145516Sdarrenr fin->fin_plen > avail) { 999145516Sdarrenr MCLGET(m, M_DONTWAIT); 1000145516Sdarrenr if ((m->m_flags & M_EXT) == 0) { 1001145516Sdarrenr FREE_MB_T(m); 1002145516Sdarrenr return -1; 1003145516Sdarrenr } 1004145516Sdarrenr avail = MCLBYTES; 1005145516Sdarrenr } 1006145516Sdarrenr xtra = MIN(fin->fin_plen, 1007145516Sdarrenr avail - hlen - sizeof(*icmp) - max_linkhdr); 1008145516Sdarrenr if (dst == 0) { 1009145516Sdarrenr if (fr_ifpaddr(6, FRI_NORMAL, ifp, 1010145516Sdarrenr (struct in_addr *)&dst6, NULL) == -1) { 1011145516Sdarrenr FREE_MB_T(m); 1012145516Sdarrenr return -1; 1013145516Sdarrenr } 1014145516Sdarrenr } else 1015145516Sdarrenr dst6 = fin->fin_dst6; 1016145516Sdarrenr } 1017145516Sdarrenr#endif 1018145516Sdarrenr else { 1019145516Sdarrenr FREE_MB_T(m); 1020145516Sdarrenr return -1; 1021145516Sdarrenr } 1022145516Sdarrenr 1023145516Sdarrenr iclen = hlen + sizeof(*icmp); 1024145516Sdarrenr avail -= (max_linkhdr + iclen); 1025145516Sdarrenr if (avail < 0) { 1026145516Sdarrenr FREE_MB_T(m); 1027145516Sdarrenr return -1; 1028145516Sdarrenr } 1029145516Sdarrenr if (xtra > avail) 1030145516Sdarrenr xtra = avail; 1031145516Sdarrenr iclen += xtra; 1032145516Sdarrenr m->m_data += max_linkhdr; 1033145516Sdarrenr m->m_pkthdr.rcvif = (struct ifnet *)0; 1034145516Sdarrenr m->m_pkthdr.len = iclen; 1035145516Sdarrenr m->m_len = iclen; 1036145516Sdarrenr ip = mtod(m, ip_t *); 1037145516Sdarrenr icmp = (struct icmp *)((char *)ip + hlen); 1038145516Sdarrenr ip2 = (ip_t *)&icmp->icmp_ip; 1039145516Sdarrenr 1040145516Sdarrenr icmp->icmp_type = type; 1041145516Sdarrenr icmp->icmp_code = fin->fin_icode; 1042145516Sdarrenr icmp->icmp_cksum = 0; 1043145516Sdarrenr#ifdef icmp_nextmtu 1044145516Sdarrenr if (type == ICMP_UNREACH && 1045145516Sdarrenr fin->fin_icode == ICMP_UNREACH_NEEDFRAG && ifp) 1046145516Sdarrenr icmp->icmp_nextmtu = htons(((struct ifnet *)ifp)->if_mtu); 1047145516Sdarrenr#endif 1048145516Sdarrenr 1049145516Sdarrenr bcopy((char *)fin->fin_ip, (char *)ip2, ohlen); 1050145516Sdarrenr 1051145516Sdarrenr#ifdef USE_INET6 1052145516Sdarrenr ip6 = (ip6_t *)ip; 1053145516Sdarrenr if (fin->fin_v == 6) { 1054145516Sdarrenr ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 1055145516Sdarrenr ip6->ip6_plen = htons(iclen - hlen); 1056145516Sdarrenr ip6->ip6_nxt = IPPROTO_ICMPV6; 1057145516Sdarrenr ip6->ip6_hlim = 0; 1058145516Sdarrenr ip6->ip6_src = dst6; 1059145516Sdarrenr ip6->ip6_dst = fin->fin_src6; 1060145516Sdarrenr if (xtra > 0) 1061145516Sdarrenr bcopy((char *)fin->fin_ip + ohlen, 1062145516Sdarrenr (char *)&icmp->icmp_ip + ohlen, xtra); 1063145516Sdarrenr icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6, 1064145516Sdarrenr sizeof(*ip6), iclen - hlen); 1065145516Sdarrenr } else 1066145516Sdarrenr#endif 1067145516Sdarrenr { 1068145516Sdarrenr ip2->ip_len = htons(ip2->ip_len); 1069145516Sdarrenr ip2->ip_off = htons(ip2->ip_off); 1070145516Sdarrenr ip->ip_p = IPPROTO_ICMP; 1071145516Sdarrenr ip->ip_src.s_addr = dst4.s_addr; 1072145516Sdarrenr ip->ip_dst.s_addr = fin->fin_saddr; 1073145516Sdarrenr 1074145516Sdarrenr if (xtra > 0) 1075145516Sdarrenr bcopy((char *)fin->fin_ip + ohlen, 1076145516Sdarrenr (char *)&icmp->icmp_ip + ohlen, xtra); 1077145516Sdarrenr icmp->icmp_cksum = ipf_cksum((u_short *)icmp, 1078145516Sdarrenr sizeof(*icmp) + 8); 1079145516Sdarrenr ip->ip_len = iclen; 1080145516Sdarrenr ip->ip_p = IPPROTO_ICMP; 1081145516Sdarrenr } 1082145516Sdarrenr err = fr_send_ip(fin, m, &m); 1083145516Sdarrenr return err; 1084145516Sdarrenr} 1085145516Sdarrenr 1086145516Sdarrenr 1087145516Sdarrenr#if !defined(IPFILTER_LKM) && (__FreeBSD_version < 300000) 1088145516Sdarrenr# if (BSD < 199306) 1089145516Sdarrenrint iplinit __P((void)); 1090145516Sdarrenr 1091145516Sdarrenrint 1092145516Sdarrenr# else 1093145516Sdarrenrvoid iplinit __P((void)); 1094145516Sdarrenr 1095145516Sdarrenrvoid 1096145516Sdarrenr# endif 1097145516Sdarrenriplinit() 1098145516Sdarrenr{ 1099145516Sdarrenr if (iplattach() != 0) 1100145516Sdarrenr printf("IP Filter failed to attach\n"); 1101145516Sdarrenr ip_init(); 1102145516Sdarrenr} 1103145516Sdarrenr#endif /* __FreeBSD_version < 300000 */ 1104145516Sdarrenr 1105145516Sdarrenr 1106145516Sdarrenrint fr_fastroute(m0, mpp, fin, fdp) 1107145516Sdarrenrmb_t *m0, **mpp; 1108145516Sdarrenrfr_info_t *fin; 1109145516Sdarrenrfrdest_t *fdp; 1110145516Sdarrenr{ 1111145516Sdarrenr register struct ip *ip, *mhip; 1112145516Sdarrenr register struct mbuf *m = m0; 1113145516Sdarrenr register struct route *ro; 1114145516Sdarrenr int len, off, error = 0, hlen, code; 1115145516Sdarrenr struct ifnet *ifp, *sifp; 1116145516Sdarrenr struct sockaddr_in *dst; 1117145516Sdarrenr struct route iproute; 1118145516Sdarrenr u_short ip_off; 1119145516Sdarrenr frentry_t *fr; 1120145516Sdarrenr 1121145516Sdarrenr#ifdef M_WRITABLE 1122145516Sdarrenr /* 1123145516Sdarrenr * HOT FIX/KLUDGE: 1124145516Sdarrenr * 1125145516Sdarrenr * If the mbuf we're about to send is not writable (because of 1126145516Sdarrenr * a cluster reference, for example) we'll need to make a copy 1127145516Sdarrenr * of it since this routine modifies the contents. 1128145516Sdarrenr * 1129145516Sdarrenr * If you have non-crappy network hardware that can transmit data 1130145516Sdarrenr * from the mbuf, rather than making a copy, this is gonna be a 1131145516Sdarrenr * problem. 1132145516Sdarrenr */ 1133145516Sdarrenr if (M_WRITABLE(m) == 0) { 1134145516Sdarrenr if ((m0 = m_dup(m, M_DONTWAIT)) != 0) { 1135145516Sdarrenr FREE_MB_T(m); 1136145516Sdarrenr m = m0; 1137145516Sdarrenr *mpp = m; 1138145516Sdarrenr } else { 1139145516Sdarrenr error = ENOBUFS; 1140145516Sdarrenr FREE_MB_T(m); 1141145516Sdarrenr *mpp = NULL; 1142145516Sdarrenr fr_frouteok[1]++; 1143145516Sdarrenr } 1144145516Sdarrenr } 1145145516Sdarrenr#endif 1146145516Sdarrenr 1147145516Sdarrenr#ifdef USE_INET6 1148145516Sdarrenr if (fin->fin_v == 6) { 1149145516Sdarrenr /* 1150145516Sdarrenr * currently "to <if>" and "to <if>:ip#" are not supported 1151145516Sdarrenr * for IPv6 1152145516Sdarrenr */ 1153145516Sdarrenr#if (__FreeBSD_version >= 490000) 1154145516Sdarrenr return ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 1155145516Sdarrenr#else 1156145516Sdarrenr return ip6_output(m0, NULL, NULL, 0, NULL, NULL); 1157145516Sdarrenr#endif 1158145516Sdarrenr } 1159145516Sdarrenr#endif 1160145516Sdarrenr 1161145516Sdarrenr hlen = fin->fin_hlen; 1162145516Sdarrenr ip = mtod(m0, struct ip *); 1163145516Sdarrenr 1164145516Sdarrenr /* 1165145516Sdarrenr * Route packet. 1166145516Sdarrenr */ 1167145516Sdarrenr ro = &iproute; 1168145516Sdarrenr bzero((caddr_t)ro, sizeof (*ro)); 1169145516Sdarrenr dst = (struct sockaddr_in *)&ro->ro_dst; 1170145516Sdarrenr dst->sin_family = AF_INET; 1171145516Sdarrenr dst->sin_addr = ip->ip_dst; 1172145516Sdarrenr 1173145516Sdarrenr fr = fin->fin_fr; 1174145516Sdarrenr if (fdp != NULL) 1175145516Sdarrenr ifp = fdp->fd_ifp; 1176145516Sdarrenr else 1177145516Sdarrenr ifp = fin->fin_ifp; 1178145516Sdarrenr 1179145516Sdarrenr if ((ifp == NULL) && (!fr || !(fr->fr_flags & FR_FASTROUTE))) { 1180145516Sdarrenr error = -2; 1181145516Sdarrenr goto bad; 1182145516Sdarrenr } 1183145516Sdarrenr 1184145516Sdarrenr /* 1185145516Sdarrenr * In case we're here due to "to <if>" being used with "keep state", 1186145516Sdarrenr * check that we're going in the correct direction. 1187145516Sdarrenr */ 1188145516Sdarrenr if ((fr != NULL) && (fin->fin_rev != 0)) { 1189145516Sdarrenr if ((ifp != NULL) && (fdp == &fr->fr_tif)) 1190145516Sdarrenr return -1; 1191145516Sdarrenr } 1192145516Sdarrenr if (fdp != NULL) { 1193145516Sdarrenr if (fdp->fd_ip.s_addr != 0) 1194145516Sdarrenr dst->sin_addr = fdp->fd_ip; 1195145516Sdarrenr } 1196145516Sdarrenr 1197145516Sdarrenr dst->sin_len = sizeof(*dst); 1198145516Sdarrenr rtalloc(ro); 1199145516Sdarrenr 1200145516Sdarrenr if ((ifp == NULL) && (ro->ro_rt != NULL)) 1201145516Sdarrenr ifp = ro->ro_rt->rt_ifp; 1202145516Sdarrenr 1203145516Sdarrenr if ((ro->ro_rt == NULL) || (ifp == NULL)) { 1204145516Sdarrenr if (in_localaddr(ip->ip_dst)) 1205145516Sdarrenr error = EHOSTUNREACH; 1206145516Sdarrenr else 1207145516Sdarrenr error = ENETUNREACH; 1208145516Sdarrenr goto bad; 1209145516Sdarrenr } 1210145516Sdarrenr if (ro->ro_rt->rt_flags & RTF_GATEWAY) 1211145516Sdarrenr dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; 1212145516Sdarrenr if (ro->ro_rt) 1213145516Sdarrenr ro->ro_rt->rt_use++; 1214145516Sdarrenr 1215145516Sdarrenr /* 1216145516Sdarrenr * For input packets which are being "fastrouted", they won't 1217145516Sdarrenr * go back through output filtering and miss their chance to get 1218145516Sdarrenr * NAT'd and counted. 1219145516Sdarrenr */ 1220145516Sdarrenr if (fin->fin_out == 0) { 1221145516Sdarrenr sifp = fin->fin_ifp; 1222145516Sdarrenr fin->fin_ifp = ifp; 1223145516Sdarrenr fin->fin_out = 1; 1224145516Sdarrenr (void) fr_acctpkt(fin, NULL); 1225145516Sdarrenr fin->fin_fr = NULL; 1226145516Sdarrenr if (!fr || !(fr->fr_flags & FR_RETMASK)) { 1227145516Sdarrenr u_32_t pass; 1228145516Sdarrenr 1229145516Sdarrenr (void) fr_checkstate(fin, &pass); 1230145516Sdarrenr } 1231145516Sdarrenr 1232145516Sdarrenr switch (fr_checknatout(fin, NULL)) 1233145516Sdarrenr { 1234145516Sdarrenr case 0 : 1235145516Sdarrenr break; 1236145516Sdarrenr case 1 : 1237145516Sdarrenr ip->ip_sum = 0; 1238145516Sdarrenr break; 1239145516Sdarrenr case -1 : 1240145516Sdarrenr error = -1; 1241145516Sdarrenr goto done; 1242145516Sdarrenr break; 1243145516Sdarrenr } 1244145516Sdarrenr 1245145516Sdarrenr fin->fin_ifp = sifp; 1246145516Sdarrenr fin->fin_out = 0; 1247145516Sdarrenr } else 1248145516Sdarrenr ip->ip_sum = 0; 1249145516Sdarrenr /* 1250145516Sdarrenr * If small enough for interface, can just send directly. 1251145516Sdarrenr */ 1252145516Sdarrenr if (ip->ip_len <= ifp->if_mtu) { 1253145516Sdarrenr ip->ip_len = htons(ip->ip_len); 1254145516Sdarrenr ip->ip_off = htons(ip->ip_off); 1255145516Sdarrenr 1256145516Sdarrenr if (!ip->ip_sum) 1257145516Sdarrenr ip->ip_sum = in_cksum(m, hlen); 1258145516Sdarrenr error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, 1259145516Sdarrenr ro->ro_rt); 1260145516Sdarrenr goto done; 1261145516Sdarrenr } 1262145516Sdarrenr /* 1263145516Sdarrenr * Too large for interface; fragment if possible. 1264145516Sdarrenr * Must be able to put at least 8 bytes per fragment. 1265145516Sdarrenr */ 1266145516Sdarrenr ip_off = ntohs(ip->ip_off); 1267145516Sdarrenr if (ip_off & IP_DF) { 1268145516Sdarrenr error = EMSGSIZE; 1269145516Sdarrenr goto bad; 1270145516Sdarrenr } 1271145516Sdarrenr len = (ifp->if_mtu - hlen) &~ 7; 1272145516Sdarrenr if (len < 8) { 1273145516Sdarrenr error = EMSGSIZE; 1274145516Sdarrenr goto bad; 1275145516Sdarrenr } 1276145516Sdarrenr 1277145516Sdarrenr { 1278145516Sdarrenr int mhlen, firstlen = len; 1279145516Sdarrenr struct mbuf **mnext = &m->m_act; 1280145516Sdarrenr 1281145516Sdarrenr /* 1282145516Sdarrenr * Loop through length of segment after first fragment, 1283145516Sdarrenr * make new header and copy data of each part and link onto chain. 1284145516Sdarrenr */ 1285145516Sdarrenr m0 = m; 1286145516Sdarrenr mhlen = sizeof (struct ip); 1287145516Sdarrenr for (off = hlen + len; off < ip->ip_len; off += len) { 1288145516Sdarrenr#ifdef MGETHDR 1289145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 1290145516Sdarrenr#else 1291145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 1292145516Sdarrenr#endif 1293145516Sdarrenr if (m == 0) { 1294145516Sdarrenr m = m0; 1295145516Sdarrenr error = ENOBUFS; 1296145516Sdarrenr goto bad; 1297145516Sdarrenr } 1298145516Sdarrenr m->m_data += max_linkhdr; 1299145516Sdarrenr mhip = mtod(m, struct ip *); 1300145516Sdarrenr bcopy((char *)ip, (char *)mhip, sizeof(*ip)); 1301145516Sdarrenr if (hlen > sizeof (struct ip)) { 1302145516Sdarrenr mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 1303145516Sdarrenr IP_HL_A(mhip, mhlen >> 2); 1304145516Sdarrenr } 1305145516Sdarrenr m->m_len = mhlen; 1306145516Sdarrenr mhip->ip_off = ((off - hlen) >> 3) + ip_off; 1307145516Sdarrenr if (off + len >= ip->ip_len) 1308145516Sdarrenr len = ip->ip_len - off; 1309145516Sdarrenr else 1310145516Sdarrenr mhip->ip_off |= IP_MF; 1311145516Sdarrenr mhip->ip_len = htons((u_short)(len + mhlen)); 1312145516Sdarrenr m->m_next = m_copy(m0, off, len); 1313145516Sdarrenr if (m->m_next == 0) { 1314145516Sdarrenr error = ENOBUFS; /* ??? */ 1315145516Sdarrenr goto sendorfree; 1316145516Sdarrenr } 1317145516Sdarrenr m->m_pkthdr.len = mhlen + len; 1318145516Sdarrenr m->m_pkthdr.rcvif = NULL; 1319145516Sdarrenr mhip->ip_off = htons((u_short)mhip->ip_off); 1320145516Sdarrenr mhip->ip_sum = 0; 1321145516Sdarrenr mhip->ip_sum = in_cksum(m, mhlen); 1322145516Sdarrenr *mnext = m; 1323145516Sdarrenr mnext = &m->m_act; 1324145516Sdarrenr } 1325145516Sdarrenr /* 1326145516Sdarrenr * Update first fragment by trimming what's been copied out 1327145516Sdarrenr * and updating header, then send each fragment (in order). 1328145516Sdarrenr */ 1329145516Sdarrenr m_adj(m0, hlen + firstlen - ip->ip_len); 1330145516Sdarrenr ip->ip_len = htons((u_short)(hlen + firstlen)); 1331145516Sdarrenr ip->ip_off = htons((u_short)IP_MF); 1332145516Sdarrenr ip->ip_sum = 0; 1333145516Sdarrenr ip->ip_sum = in_cksum(m0, hlen); 1334145516Sdarrenrsendorfree: 1335145516Sdarrenr for (m = m0; m; m = m0) { 1336145516Sdarrenr m0 = m->m_act; 1337145516Sdarrenr m->m_act = 0; 1338145516Sdarrenr if (error == 0) 1339145516Sdarrenr error = (*ifp->if_output)(ifp, m, 1340145516Sdarrenr (struct sockaddr *)dst, ro->ro_rt); 1341145516Sdarrenr else 1342145516Sdarrenr FREE_MB_T(m); 1343145516Sdarrenr } 1344145516Sdarrenr } 1345145516Sdarrenrdone: 1346145516Sdarrenr if (!error) 1347145516Sdarrenr fr_frouteok[0]++; 1348145516Sdarrenr else 1349145516Sdarrenr fr_frouteok[1]++; 1350145516Sdarrenr 1351145516Sdarrenr if (ro->ro_rt) { 1352145516Sdarrenr RTFREE(ro->ro_rt); 1353145516Sdarrenr } 1354145516Sdarrenr *mpp = NULL; 1355145516Sdarrenr return 0; 1356145516Sdarrenrbad: 1357145516Sdarrenr if (error == EMSGSIZE) { 1358145516Sdarrenr sifp = fin->fin_ifp; 1359145516Sdarrenr code = fin->fin_icode; 1360145516Sdarrenr fin->fin_icode = ICMP_UNREACH_NEEDFRAG; 1361145516Sdarrenr fin->fin_ifp = ifp; 1362145516Sdarrenr (void) fr_send_icmp_err(ICMP_UNREACH, fin, 1); 1363145516Sdarrenr fin->fin_ifp = sifp; 1364145516Sdarrenr fin->fin_icode = code; 1365145516Sdarrenr } 1366145516Sdarrenr FREE_MB_T(m); 1367145516Sdarrenr goto done; 1368145516Sdarrenr} 1369145516Sdarrenr 1370145516Sdarrenr 1371145516Sdarrenrint fr_verifysrc(fin) 1372145516Sdarrenrfr_info_t *fin; 1373145516Sdarrenr{ 1374145516Sdarrenr struct sockaddr_in *dst; 1375145516Sdarrenr struct route iproute; 1376145516Sdarrenr 1377145516Sdarrenr bzero((char *)&iproute, sizeof(iproute)); 1378145516Sdarrenr dst = (struct sockaddr_in *)&iproute.ro_dst; 1379145516Sdarrenr dst->sin_len = sizeof(*dst); 1380145516Sdarrenr dst->sin_family = AF_INET; 1381145516Sdarrenr dst->sin_addr = fin->fin_src; 1382145516Sdarrenr rtalloc(&iproute); 1383145516Sdarrenr if (iproute.ro_rt == NULL) 1384145516Sdarrenr return 0; 1385145516Sdarrenr return (fin->fin_ifp == iproute.ro_rt->rt_ifp); 1386145516Sdarrenr} 1387145516Sdarrenr 1388145516Sdarrenr 1389145516Sdarrenr/* 1390145516Sdarrenr * return the first IP Address associated with an interface 1391145516Sdarrenr */ 1392145516Sdarrenrint fr_ifpaddr(v, atype, ifptr, inp, inpmask) 1393145516Sdarrenrint v, atype; 1394145516Sdarrenrvoid *ifptr; 1395145516Sdarrenrstruct in_addr *inp, *inpmask; 1396145516Sdarrenr{ 1397145516Sdarrenr#ifdef USE_INET6 1398145516Sdarrenr struct in6_addr *inp6 = NULL; 1399145516Sdarrenr#endif 1400145516Sdarrenr struct sockaddr *sock, *mask; 1401145516Sdarrenr struct sockaddr_in *sin; 1402145516Sdarrenr struct ifaddr *ifa; 1403145516Sdarrenr struct ifnet *ifp; 1404145516Sdarrenr 1405145516Sdarrenr if ((ifptr == NULL) || (ifptr == (void *)-1)) 1406145516Sdarrenr return -1; 1407145516Sdarrenr 1408145516Sdarrenr sin = NULL; 1409145516Sdarrenr ifp = ifptr; 1410145516Sdarrenr 1411145516Sdarrenr if (v == 4) 1412145516Sdarrenr inp->s_addr = 0; 1413145516Sdarrenr#ifdef USE_INET6 1414145516Sdarrenr else if (v == 6) 1415145516Sdarrenr bzero((char *)inp, sizeof(struct in6_addr)); 1416145516Sdarrenr#endif 1417145516Sdarrenr#if (__FreeBSD_version >= 300000) 1418145516Sdarrenr ifa = TAILQ_FIRST(&ifp->if_addrhead); 1419145516Sdarrenr#else 1420145516Sdarrenr ifa = ifp->if_addrlist; 1421145516Sdarrenr#endif /* __FreeBSD_version >= 300000 */ 1422145516Sdarrenr 1423145516Sdarrenr sock = ifa->ifa_addr; 1424145516Sdarrenr while (sock != NULL && ifa != NULL) { 1425145516Sdarrenr sin = (struct sockaddr_in *)sock; 1426145516Sdarrenr if ((v == 4) && (sin->sin_family == AF_INET)) 1427145516Sdarrenr break; 1428145516Sdarrenr#ifdef USE_INET6 1429145516Sdarrenr if ((v == 6) && (sin->sin_family == AF_INET6)) { 1430145516Sdarrenr inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; 1431145516Sdarrenr if (!IN6_IS_ADDR_LINKLOCAL(inp6) && 1432145516Sdarrenr !IN6_IS_ADDR_LOOPBACK(inp6)) 1433145516Sdarrenr break; 1434145516Sdarrenr } 1435145516Sdarrenr#endif 1436145516Sdarrenr#if (__FreeBSD_version >= 300000) 1437145516Sdarrenr ifa = TAILQ_NEXT(ifa, ifa_link); 1438145516Sdarrenr#else 1439145516Sdarrenr ifa = ifa->ifa_next; 1440145516Sdarrenr#endif /* __FreeBSD_version >= 300000 */ 1441145516Sdarrenr if (ifa != NULL) 1442145516Sdarrenr sock = ifa->ifa_addr; 1443145516Sdarrenr } 1444145516Sdarrenr 1445145516Sdarrenr if (ifa == NULL || sin == NULL) 1446145516Sdarrenr return -1; 1447145516Sdarrenr 1448145516Sdarrenr mask = ifa->ifa_netmask; 1449145516Sdarrenr if (atype == FRI_BROADCAST) 1450145516Sdarrenr sock = ifa->ifa_broadaddr; 1451145516Sdarrenr else if (atype == FRI_PEERADDR) 1452145516Sdarrenr sock = ifa->ifa_dstaddr; 1453145516Sdarrenr 1454145516Sdarrenr#ifdef USE_INET6 1455145516Sdarrenr if (v == 6) { 1456145516Sdarrenr return fr_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock, 1457145516Sdarrenr (struct sockaddr_in6 *)mask, 1458145516Sdarrenr inp, inpmask); 1459145516Sdarrenr } 1460145516Sdarrenr#endif 1461145516Sdarrenr return fr_ifpfillv4addr(atype, (struct sockaddr_in *)sock, 1462145516Sdarrenr (struct sockaddr_in *)mask, inp, inpmask); 1463145516Sdarrenr} 1464145516Sdarrenr 1465145516Sdarrenr 1466145516Sdarrenru_32_t fr_newisn(fin) 1467145516Sdarrenrfr_info_t *fin; 1468145516Sdarrenr{ 1469145516Sdarrenr u_32_t newiss; 1470145516Sdarrenr#if (__FreeBSD_version >= 400000) 1471145516Sdarrenr newiss = arc4random(); 1472145516Sdarrenr#else 1473145516Sdarrenr static iss_seq_off = 0; 1474145516Sdarrenr u_char hash[16]; 1475145516Sdarrenr MD5_CTX ctx; 1476145516Sdarrenr 1477145516Sdarrenr /* 1478145516Sdarrenr * Compute the base value of the ISS. It is a hash 1479145516Sdarrenr * of (saddr, sport, daddr, dport, secret). 1480145516Sdarrenr */ 1481145516Sdarrenr MD5Init(&ctx); 1482145516Sdarrenr 1483145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, 1484145516Sdarrenr sizeof(fin->fin_fi.fi_src)); 1485145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, 1486145516Sdarrenr sizeof(fin->fin_fi.fi_dst)); 1487145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); 1488145516Sdarrenr 1489145516Sdarrenr MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret)); 1490145516Sdarrenr 1491145516Sdarrenr MD5Final(hash, &ctx); 1492145516Sdarrenr 1493145516Sdarrenr memcpy(&newiss, hash, sizeof(newiss)); 1494145516Sdarrenr 1495145516Sdarrenr /* 1496145516Sdarrenr * Now increment our "timer", and add it in to 1497145516Sdarrenr * the computed value. 1498145516Sdarrenr * 1499145516Sdarrenr * XXX Use `addin'? 1500145516Sdarrenr * XXX TCP_ISSINCR too large to use? 1501145516Sdarrenr */ 1502145516Sdarrenr iss_seq_off += 0x00010000; 1503145516Sdarrenr newiss += iss_seq_off; 1504145516Sdarrenr#endif 1505145516Sdarrenr return newiss; 1506145516Sdarrenr} 1507145516Sdarrenr 1508145516Sdarrenr 1509145516Sdarrenr/* ------------------------------------------------------------------------ */ 1510145516Sdarrenr/* Function: fr_nextipid */ 1511145516Sdarrenr/* Returns: int - 0 == success, -1 == error (packet should be droppped) */ 1512145516Sdarrenr/* Parameters: fin(I) - pointer to packet information */ 1513145516Sdarrenr/* */ 1514145516Sdarrenr/* Returns the next IPv4 ID to use for this packet. */ 1515145516Sdarrenr/* ------------------------------------------------------------------------ */ 1516145516Sdarrenru_short fr_nextipid(fin) 1517145516Sdarrenrfr_info_t *fin; 1518145516Sdarrenr{ 1519145516Sdarrenr#ifndef RANDOM_IP_ID 1520145516Sdarrenr static u_short ipid = 0; 1521145516Sdarrenr u_short id; 1522145516Sdarrenr 1523145516Sdarrenr MUTEX_ENTER(&ipf_rw); 1524145516Sdarrenr id = ipid++; 1525145516Sdarrenr MUTEX_EXIT(&ipf_rw); 1526145516Sdarrenr#else 1527145516Sdarrenr u_short id; 1528145516Sdarrenr 1529145516Sdarrenr id = ip_randomid(); 1530145516Sdarrenr#endif 1531145516Sdarrenr 1532145516Sdarrenr return id; 1533145516Sdarrenr} 1534145516Sdarrenr 1535145516Sdarrenr 1536145516SdarrenrINLINE void fr_checkv4sum(fin) 1537145516Sdarrenrfr_info_t *fin; 1538145516Sdarrenr{ 1539145516Sdarrenr#ifdef CSUM_DATA_VALID 1540145516Sdarrenr int manual = 0; 1541145516Sdarrenr u_short sum; 1542145516Sdarrenr ip_t *ip; 1543145516Sdarrenr mb_t *m; 1544145516Sdarrenr 1545145516Sdarrenr if ((fin->fin_flx & FI_NOCKSUM) != 0) 1546145516Sdarrenr return; 1547145516Sdarrenr 1548145516Sdarrenr m = fin->fin_m; 1549145516Sdarrenr if (m == NULL) { 1550145516Sdarrenr manual = 1; 1551145516Sdarrenr goto skipauto; 1552145516Sdarrenr } 1553145516Sdarrenr ip = fin->fin_ip; 1554145516Sdarrenr 1555145516Sdarrenr if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 1556145516Sdarrenr if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 1557145516Sdarrenr sum = m->m_pkthdr.csum_data; 1558145516Sdarrenr else 1559145516Sdarrenr sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, 1560145516Sdarrenr htonl(m->m_pkthdr.csum_data + 1561145516Sdarrenr fin->fin_ip->ip_len + fin->fin_p)); 1562145516Sdarrenr sum ^= 0xffff; 1563145516Sdarrenr if (sum != 0) 1564145516Sdarrenr fin->fin_flx |= FI_BAD; 1565145516Sdarrenr } else 1566145516Sdarrenr manual = 1; 1567145516Sdarrenrskipauto: 1568145516Sdarrenr# ifdef IPFILTER_CKSUM 1569145516Sdarrenr if (manual != 0) 1570145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1571145516Sdarrenr fin->fin_flx |= FI_BAD; 1572145516Sdarrenr# else 1573145516Sdarrenr ; 1574145516Sdarrenr# endif 1575145516Sdarrenr#else 1576145516Sdarrenr# ifdef IPFILTER_CKSUM 1577145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1578145516Sdarrenr fin->fin_flx |= FI_BAD; 1579145516Sdarrenr# endif 1580145516Sdarrenr#endif 1581145516Sdarrenr} 1582145516Sdarrenr 1583145516Sdarrenr 1584145516Sdarrenr#ifdef USE_INET6 1585145516SdarrenrINLINE void fr_checkv6sum(fin) 1586145516Sdarrenrfr_info_t *fin; 1587145516Sdarrenr{ 1588145516Sdarrenr# ifdef IPFILTER_CKSUM 1589145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1590145516Sdarrenr fin->fin_flx |= FI_BAD; 1591145516Sdarrenr# endif 1592145516Sdarrenr} 1593145516Sdarrenr#endif /* USE_INET6 */ 1594145516Sdarrenr 1595145516Sdarrenr 1596145516Sdarrenrsize_t mbufchainlen(m0) 1597145516Sdarrenrstruct mbuf *m0; 1598145516Sdarrenr{ 1599145516Sdarrenr size_t len; 1600145516Sdarrenr 1601145516Sdarrenr if ((m0->m_flags & M_PKTHDR) != 0) { 1602145516Sdarrenr len = m0->m_pkthdr.len; 1603145516Sdarrenr } else { 1604145516Sdarrenr struct mbuf *m; 1605145516Sdarrenr 1606145516Sdarrenr for (m = m0, len = 0; m != NULL; m = m->m_next) 1607145516Sdarrenr len += m->m_len; 1608145516Sdarrenr } 1609145516Sdarrenr return len; 1610145516Sdarrenr} 1611145516Sdarrenr 1612145516Sdarrenr 1613145516Sdarrenr/* ------------------------------------------------------------------------ */ 1614145516Sdarrenr/* Function: fr_pullup */ 1615145516Sdarrenr/* Returns: NULL == pullup failed, else pointer to protocol header */ 1616145516Sdarrenr/* Parameters: m(I) - pointer to buffer where data packet starts */ 1617145516Sdarrenr/* fin(I) - pointer to packet information */ 1618145516Sdarrenr/* len(I) - number of bytes to pullup */ 1619145516Sdarrenr/* */ 1620145516Sdarrenr/* Attempt to move at least len bytes (from the start of the buffer) into a */ 1621145516Sdarrenr/* single buffer for ease of access. Operating system native functions are */ 1622145516Sdarrenr/* used to manage buffers - if necessary. If the entire packet ends up in */ 1623145516Sdarrenr/* a single buffer, set the FI_COALESCE flag even though fr_coalesce() has */ 1624145516Sdarrenr/* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */ 1625145516Sdarrenr/* and ONLY if the pullup succeeds. */ 1626145516Sdarrenr/* */ 1627145516Sdarrenr/* We assume that 'min' is a pointer to a buffer that is part of the chain */ 1628145516Sdarrenr/* of buffers that starts at *fin->fin_mp. */ 1629145516Sdarrenr/* ------------------------------------------------------------------------ */ 1630145516Sdarrenrvoid *fr_pullup(min, fin, len) 1631145516Sdarrenrmb_t *min; 1632145516Sdarrenrfr_info_t *fin; 1633145516Sdarrenrint len; 1634145516Sdarrenr{ 1635145516Sdarrenr int out = fin->fin_out, dpoff, ipoff; 1636145516Sdarrenr mb_t *m = min; 1637145516Sdarrenr char *ip; 1638145516Sdarrenr 1639145516Sdarrenr if (m == NULL) 1640145516Sdarrenr return NULL; 1641145516Sdarrenr 1642145516Sdarrenr ip = (char *)fin->fin_ip; 1643145516Sdarrenr if ((fin->fin_flx & FI_COALESCE) != 0) 1644145516Sdarrenr return ip; 1645145516Sdarrenr 1646145516Sdarrenr ipoff = fin->fin_ipoff; 1647145516Sdarrenr if (fin->fin_dp != NULL) 1648145516Sdarrenr dpoff = (char *)fin->fin_dp - (char *)ip; 1649145516Sdarrenr else 1650145516Sdarrenr dpoff = 0; 1651145516Sdarrenr 1652145516Sdarrenr if (M_LEN(m) < len) { 1653145516Sdarrenr#ifdef MHLEN 1654145516Sdarrenr /* 1655145516Sdarrenr * Assume that M_PKTHDR is set and just work with what is left 1656145516Sdarrenr * rather than check.. 1657145516Sdarrenr * Should not make any real difference, anyway. 1658145516Sdarrenr */ 1659145516Sdarrenr if (len > MHLEN) 1660145516Sdarrenr#else 1661145516Sdarrenr if (len > MLEN) 1662145516Sdarrenr#endif 1663145516Sdarrenr { 1664145516Sdarrenr#ifdef HAVE_M_PULLDOWN 1665145516Sdarrenr if (m_pulldown(m, 0, len, NULL) == NULL) 1666145516Sdarrenr m = NULL; 1667145516Sdarrenr#else 1668145516Sdarrenr FREE_MB_T(*fin->fin_mp); 1669145516Sdarrenr m = NULL; 1670145516Sdarrenr#endif 1671145516Sdarrenr } else 1672145516Sdarrenr { 1673145516Sdarrenr m = m_pullup(m, len); 1674145516Sdarrenr } 1675145516Sdarrenr *fin->fin_mp = m; 1676145516Sdarrenr fin->fin_m = m; 1677145516Sdarrenr if (m == NULL) { 1678145516Sdarrenr ATOMIC_INCL(frstats[out].fr_pull[1]); 1679145516Sdarrenr return NULL; 1680145516Sdarrenr } 1681145516Sdarrenr ip = MTOD(m, char *) + ipoff; 1682145516Sdarrenr } 1683145516Sdarrenr 1684145516Sdarrenr ATOMIC_INCL(frstats[out].fr_pull[0]); 1685145516Sdarrenr fin->fin_ip = (ip_t *)ip; 1686145516Sdarrenr if (fin->fin_dp != NULL) 1687145516Sdarrenr fin->fin_dp = (char *)fin->fin_ip + dpoff; 1688145516Sdarrenr 1689145516Sdarrenr if (len == fin->fin_plen) 1690145516Sdarrenr fin->fin_flx |= FI_COALESCE; 1691145516Sdarrenr return ip; 1692145516Sdarrenr} 1693