ip_fil_freebsd.c revision 172776
1145516Sdarrenr/* $FreeBSD: head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c 172776 2007-10-18 21:52:14Z darrenr $ */ 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"; 10172776Sdarrenrstatic const char rcsid[] = "@(#)$Id: ip_fil_freebsd.c,v 2.53.2.50 2007/09/20 12:51:50 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> 60170268Sdarrenr#if __FreeBSD_version >= 500043 61170268Sdarrenr# include <sys/selinfo.h> 62170268Sdarrenr#else 63170268Sdarrenr# include <sys/select.h> 64170268Sdarrenr#endif 65145516Sdarrenr 66145516Sdarrenr#include <net/if.h> 67145516Sdarrenr#if __FreeBSD_version >= 300000 68145516Sdarrenr# include <net/if_var.h> 69170268Sdarrenr# if __FreeBSD_version >= 500043 70170268Sdarrenr# include <net/netisr.h> 71170268Sdarrenr# endif 72145516Sdarrenr# if !defined(IPFILTER_LKM) 73145516Sdarrenr# include "opt_ipfilter.h" 74145516Sdarrenr# endif 75145516Sdarrenr#endif 76145516Sdarrenr#include <net/route.h> 77145516Sdarrenr#include <netinet/in.h> 78145516Sdarrenr#include <netinet/in_var.h> 79145516Sdarrenr#include <netinet/in_systm.h> 80145516Sdarrenr#include <netinet/ip.h> 81145516Sdarrenr#include <netinet/ip_var.h> 82145516Sdarrenr#include <netinet/tcp.h> 83145516Sdarrenr#if defined(__osf__) 84145516Sdarrenr# include <netinet/tcp_timer.h> 85145516Sdarrenr#endif 86145516Sdarrenr#include <netinet/udp.h> 87145516Sdarrenr#include <netinet/tcpip.h> 88145516Sdarrenr#include <netinet/ip_icmp.h> 89145516Sdarrenr#ifndef _KERNEL 90145516Sdarrenr# include "netinet/ipf.h" 91145516Sdarrenr#endif 92145516Sdarrenr#include "netinet/ip_compat.h" 93145516Sdarrenr#ifdef USE_INET6 94145516Sdarrenr# include <netinet/icmp6.h> 95145516Sdarrenr#endif 96145516Sdarrenr#include "netinet/ip_fil.h" 97145516Sdarrenr#include "netinet/ip_nat.h" 98145516Sdarrenr#include "netinet/ip_frag.h" 99145516Sdarrenr#include "netinet/ip_state.h" 100145516Sdarrenr#include "netinet/ip_proxy.h" 101145516Sdarrenr#include "netinet/ip_auth.h" 102145516Sdarrenr#ifdef IPFILTER_SYNC 103145516Sdarrenr#include "netinet/ip_sync.h" 104145516Sdarrenr#endif 105145516Sdarrenr#ifdef IPFILTER_SCAN 106145516Sdarrenr#include "netinet/ip_scan.h" 107145516Sdarrenr#endif 108145516Sdarrenr#include "netinet/ip_pool.h" 109145516Sdarrenr#if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000) 110145516Sdarrenr# include <sys/malloc.h> 111145516Sdarrenr#endif 112145516Sdarrenr#include <sys/kernel.h> 113145516Sdarrenr#ifdef CSUM_DATA_VALID 114145516Sdarrenr#include <machine/in_cksum.h> 115145516Sdarrenr#endif 116145516Sdarrenrextern int ip_optcopy __P((struct ip *, struct ip *)); 117145516Sdarrenr 118145516Sdarrenr#if (__FreeBSD_version > 460000) 119145516Sdarrenrextern int path_mtu_discovery; 120145516Sdarrenr#endif 121145516Sdarrenr 122145516Sdarrenr# ifdef IPFILTER_M_IPFILTER 123151897SrwatsonMALLOC_DEFINE(M_IPFILTER, "ipfilter", "IP Filter packet filter data structures"); 124145516Sdarrenr# endif 125145516Sdarrenr 126145516Sdarrenr 127145516Sdarrenr#if !defined(__osf__) 128145516Sdarrenrextern struct protosw inetsw[]; 129145516Sdarrenr#endif 130145516Sdarrenr 131145516Sdarrenrstatic int (*fr_savep) __P((ip_t *, int, void *, int, struct mbuf **)); 132145516Sdarrenrstatic int fr_send_ip __P((fr_info_t *, mb_t *, mb_t **)); 133145516Sdarrenr# ifdef USE_MUTEXES 134145516Sdarrenripfmutex_t ipl_mutex, ipf_authmx, ipf_rw, ipf_stinsert; 135145516Sdarrenripfmutex_t ipf_nat_new, ipf_natio, ipf_timeoutlock; 136170268Sdarrenripfrwlock_t ipf_mutex, ipf_global, ipf_ipidfrag, ipf_frcache, ipf_tokens; 137145516Sdarrenripfrwlock_t ipf_frag, ipf_state, ipf_nat, ipf_natfrag, ipf_auth; 138145516Sdarrenr# endif 139145516Sdarrenrint ipf_locks_done = 0; 140145516Sdarrenr 141145516Sdarrenr#if (__FreeBSD_version >= 300000) 142145516Sdarrenrstruct callout_handle fr_slowtimer_ch; 143145516Sdarrenr#endif 144161356Sguidostruct selinfo ipfselwait[IPL_LOGSIZE]; 145145516Sdarrenr 146145516Sdarrenr#if (__FreeBSD_version >= 500011) 147145516Sdarrenr# include <sys/conf.h> 148145516Sdarrenr# if defined(NETBSD_PF) 149145516Sdarrenr# include <net/pfil.h> 150145516Sdarrenr# include <netinet/ipprotosw.h> 151145516Sdarrenr/* 152145516Sdarrenr * We provide the fr_checkp name just to minimize changes later. 153145516Sdarrenr */ 154145516Sdarrenrint (*fr_checkp) __P((ip_t *ip, int hlen, void *ifp, int out, mb_t **mp)); 155145516Sdarrenr# endif /* NETBSD_PF */ 156145516Sdarrenr#endif /* __FreeBSD_version >= 500011 */ 157145516Sdarrenr 158145516Sdarrenr 159153876Sguido#if (__FreeBSD_version >= 502103) 160153876Sguidostatic eventhandler_tag ipf_arrivetag, ipf_departtag, ipf_clonetag; 161153876Sguido 162153876Sguidostatic void ipf_ifevent(void *arg); 163153876Sguido 164153876Sguidostatic void ipf_ifevent(arg) 165153876Sguidovoid *arg; 166153876Sguido{ 167153876Sguido frsync(NULL); 168153876Sguido} 169153876Sguido#endif 170153876Sguido 171153876Sguido 172145516Sdarrenr#if (__FreeBSD_version >= 501108) && defined(_KERNEL) 173145516Sdarrenr 174145516Sdarrenrstatic int 175145516Sdarrenrfr_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 176145516Sdarrenr{ 177145516Sdarrenr struct ip *ip = mtod(*mp, struct ip *); 178145516Sdarrenr return fr_check(ip, ip->ip_hl << 2, ifp, (dir == PFIL_OUT), mp); 179145516Sdarrenr} 180145516Sdarrenr 181145516Sdarrenr# ifdef USE_INET6 182145516Sdarrenr# include <netinet/ip6.h> 183145516Sdarrenr 184145516Sdarrenrstatic int 185145516Sdarrenrfr_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 186145516Sdarrenr{ 187145516Sdarrenr return (fr_check(mtod(*mp, struct ip *), sizeof(struct ip6_hdr), 188145516Sdarrenr ifp, (dir == PFIL_OUT), mp)); 189145516Sdarrenr} 190145516Sdarrenr# endif 191145516Sdarrenr#endif /* __FreeBSD_version >= 501108 */ 192145516Sdarrenr#if defined(IPFILTER_LKM) 193145516Sdarrenrint iplidentify(s) 194145516Sdarrenrchar *s; 195145516Sdarrenr{ 196145516Sdarrenr if (strcmp(s, "ipl") == 0) 197145516Sdarrenr return 1; 198145516Sdarrenr return 0; 199145516Sdarrenr} 200145516Sdarrenr#endif /* IPFILTER_LKM */ 201145516Sdarrenr 202145516Sdarrenr 203170268Sdarrenrint ipfattach() 204145516Sdarrenr{ 205145516Sdarrenr#ifdef USE_SPL 206145516Sdarrenr int s; 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 MUTEX_INIT(&ipf_timeoutlock, "ipf timeout queue mutex"); 217145516Sdarrenr RWLOCK_INIT(&ipf_ipidfrag, "ipf IP NAT-Frag rwlock"); 218170268Sdarrenr RWLOCK_INIT(&ipf_tokens, "ipf token rwlock"); 219145516Sdarrenr ipf_locks_done = 1; 220145516Sdarrenr 221145516Sdarrenr if (fr_initialise() < 0) { 222145516Sdarrenr SPL_X(s); 223145516Sdarrenr return EIO; 224145516Sdarrenr } 225145516Sdarrenr 226145516Sdarrenr 227145516Sdarrenr if (fr_checkp != fr_check) { 228145516Sdarrenr fr_savep = fr_checkp; 229145516Sdarrenr fr_checkp = fr_check; 230145516Sdarrenr } 231145516Sdarrenr 232161356Sguido bzero((char *)ipfselwait, sizeof(ipfselwait)); 233145516Sdarrenr bzero((char *)frcache, sizeof(frcache)); 234145516Sdarrenr fr_running = 1; 235145516Sdarrenr 236145516Sdarrenr if (fr_control_forwarding & 1) 237145516Sdarrenr ipforwarding = 1; 238145516Sdarrenr 239145516Sdarrenr SPL_X(s); 240145516Sdarrenr#if (__FreeBSD_version >= 300000) 241145516Sdarrenr fr_slowtimer_ch = timeout(fr_slowtimer, NULL, 242145516Sdarrenr (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 243145516Sdarrenr#else 244145516Sdarrenr timeout(fr_slowtimer, NULL, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 245145516Sdarrenr#endif 246145516Sdarrenr return 0; 247145516Sdarrenr} 248145516Sdarrenr 249145516Sdarrenr 250145516Sdarrenr/* 251145516Sdarrenr * Disable the filter by removing the hooks from the IP input/output 252145516Sdarrenr * stream. 253145516Sdarrenr */ 254170268Sdarrenrint ipfdetach() 255145516Sdarrenr{ 256145516Sdarrenr#ifdef USE_SPL 257145516Sdarrenr int s; 258145516Sdarrenr#endif 259145516Sdarrenr if (fr_control_forwarding & 2) 260145516Sdarrenr ipforwarding = 0; 261145516Sdarrenr 262145516Sdarrenr SPL_NET(s); 263145516Sdarrenr 264145516Sdarrenr#if (__FreeBSD_version >= 300000) 265145516Sdarrenr if (fr_slowtimer_ch.callout != NULL) 266145516Sdarrenr untimeout(fr_slowtimer, NULL, fr_slowtimer_ch); 267145516Sdarrenr bzero(&fr_slowtimer_ch, sizeof(fr_slowtimer_ch)); 268145516Sdarrenr#else 269145516Sdarrenr untimeout(fr_slowtimer, NULL); 270145516Sdarrenr#endif /* FreeBSD */ 271145516Sdarrenr 272145516Sdarrenr#ifndef NETBSD_PF 273145516Sdarrenr if (fr_checkp != NULL) 274145516Sdarrenr fr_checkp = fr_savep; 275145516Sdarrenr fr_savep = NULL; 276145516Sdarrenr#endif 277145516Sdarrenr 278145516Sdarrenr fr_deinitialise(); 279145516Sdarrenr 280145516Sdarrenr fr_running = -2; 281145516Sdarrenr 282145516Sdarrenr (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE); 283145516Sdarrenr (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE); 284145516Sdarrenr 285145516Sdarrenr if (ipf_locks_done == 1) { 286145516Sdarrenr MUTEX_DESTROY(&ipf_timeoutlock); 287145516Sdarrenr MUTEX_DESTROY(&ipf_rw); 288145516Sdarrenr RW_DESTROY(&ipf_ipidfrag); 289170268Sdarrenr RW_DESTROY(&ipf_tokens); 290145516Sdarrenr ipf_locks_done = 0; 291145516Sdarrenr } 292145516Sdarrenr 293145516Sdarrenr SPL_X(s); 294145516Sdarrenr 295145516Sdarrenr return 0; 296145516Sdarrenr} 297145516Sdarrenr 298145516Sdarrenr 299145516Sdarrenr/* 300145516Sdarrenr * Filter ioctl interface. 301145516Sdarrenr */ 302145516Sdarrenrint iplioctl(dev, cmd, data, mode 303145516Sdarrenr# if defined(_KERNEL) && ((BSD >= 199506) || (__FreeBSD_version >= 220000)) 304145516Sdarrenr, p) 305145516Sdarrenr# if (__FreeBSD_version >= 500024) 306145516Sdarrenrstruct thread *p; 307170268Sdarrenr# if (__FreeBSD_version >= 500043) 308170268Sdarrenr# define p_uid td_ucred->cr_ruid 309170268Sdarrenr# else 310170268Sdarrenr# define p_uid t_proc->p_cred->p_ruid 311170268Sdarrenr# endif 312145516Sdarrenr# else 313145516Sdarrenrstruct proc *p; 314170268Sdarrenr# define p_uid p_cred->p_ruid 315145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 316145516Sdarrenr# else 317145516Sdarrenr) 318145516Sdarrenr# endif 319145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 320145516Sdarrenrstruct cdev *dev; 321145516Sdarrenr#else 322145516Sdarrenrdev_t dev; 323145516Sdarrenr#endif 324145516Sdarrenrioctlcmd_t cmd; 325145516Sdarrenrcaddr_t data; 326145516Sdarrenrint mode; 327145516Sdarrenr{ 328170268Sdarrenr int error = 0, unit = 0; 329170268Sdarrenr SPL_INT(s); 330145516Sdarrenr 331145516Sdarrenr#if (BSD >= 199306) && defined(_KERNEL) 332153876Sguido if ((securelevel >= 3) && (mode & FWRITE)) 333145516Sdarrenr return EPERM; 334145516Sdarrenr#endif 335145516Sdarrenr 336145516Sdarrenr unit = GET_MINOR(dev); 337145516Sdarrenr if ((IPL_LOGMAX < unit) || (unit < 0)) 338145516Sdarrenr return ENXIO; 339145516Sdarrenr 340145516Sdarrenr if (fr_running <= 0) { 341145516Sdarrenr if (unit != IPL_LOGIPF) 342145516Sdarrenr return EIO; 343145516Sdarrenr if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET && 344145516Sdarrenr cmd != SIOCIPFSET && cmd != SIOCFRENB && 345145516Sdarrenr cmd != SIOCGETFS && cmd != SIOCGETFF) 346145516Sdarrenr return EIO; 347145516Sdarrenr } 348145516Sdarrenr 349145516Sdarrenr SPL_NET(s); 350170268Sdarrenr READ_ENTER(&ipf_global); 351145516Sdarrenr 352170268Sdarrenr error = fr_ioctlswitch(unit, data, cmd, mode, p->p_uid, p); 353145516Sdarrenr if (error != -1) { 354161356Sguido RWLOCK_EXIT(&ipf_global); 355145516Sdarrenr SPL_X(s); 356145516Sdarrenr return error; 357145516Sdarrenr } 358145516Sdarrenr 359170268Sdarrenr RWLOCK_EXIT(&ipf_global); 360145516Sdarrenr SPL_X(s); 361161356Sguido 362145516Sdarrenr return error; 363145516Sdarrenr} 364145516Sdarrenr 365145516Sdarrenr 366145516Sdarrenr#if 0 367145516Sdarrenrvoid fr_forgetifp(ifp) 368145516Sdarrenrvoid *ifp; 369145516Sdarrenr{ 370145516Sdarrenr register frentry_t *f; 371145516Sdarrenr 372145516Sdarrenr WRITE_ENTER(&ipf_mutex); 373145516Sdarrenr for (f = ipacct[0][fr_active]; (f != NULL); f = f->fr_next) 374145516Sdarrenr if (f->fr_ifa == ifp) 375145516Sdarrenr f->fr_ifa = (void *)-1; 376145516Sdarrenr for (f = ipacct[1][fr_active]; (f != NULL); f = f->fr_next) 377145516Sdarrenr if (f->fr_ifa == ifp) 378145516Sdarrenr f->fr_ifa = (void *)-1; 379145516Sdarrenr for (f = ipfilter[0][fr_active]; (f != NULL); f = f->fr_next) 380145516Sdarrenr if (f->fr_ifa == ifp) 381145516Sdarrenr f->fr_ifa = (void *)-1; 382145516Sdarrenr for (f = ipfilter[1][fr_active]; (f != NULL); f = f->fr_next) 383145516Sdarrenr if (f->fr_ifa == ifp) 384145516Sdarrenr f->fr_ifa = (void *)-1; 385145516Sdarrenr#ifdef USE_INET6 386145516Sdarrenr for (f = ipacct6[0][fr_active]; (f != NULL); f = f->fr_next) 387145516Sdarrenr if (f->fr_ifa == ifp) 388145516Sdarrenr f->fr_ifa = (void *)-1; 389145516Sdarrenr for (f = ipacct6[1][fr_active]; (f != NULL); f = f->fr_next) 390145516Sdarrenr if (f->fr_ifa == ifp) 391145516Sdarrenr f->fr_ifa = (void *)-1; 392145516Sdarrenr for (f = ipfilter6[0][fr_active]; (f != NULL); f = f->fr_next) 393145516Sdarrenr if (f->fr_ifa == ifp) 394145516Sdarrenr f->fr_ifa = (void *)-1; 395145516Sdarrenr for (f = ipfilter6[1][fr_active]; (f != NULL); f = f->fr_next) 396145516Sdarrenr if (f->fr_ifa == ifp) 397145516Sdarrenr f->fr_ifa = (void *)-1; 398145516Sdarrenr#endif 399145516Sdarrenr RWLOCK_EXIT(&ipf_mutex); 400145516Sdarrenr fr_natsync(ifp); 401145516Sdarrenr} 402145516Sdarrenr#endif 403145516Sdarrenr 404145516Sdarrenr 405145516Sdarrenr/* 406145516Sdarrenr * routines below for saving IP headers to buffer 407145516Sdarrenr */ 408145516Sdarrenrint iplopen(dev, flags 409145516Sdarrenr#if ((BSD >= 199506) || (__FreeBSD_version >= 220000)) && defined(_KERNEL) 410145516Sdarrenr, devtype, p) 411145516Sdarrenrint devtype; 412145516Sdarrenr# if (__FreeBSD_version >= 500024) 413145516Sdarrenrstruct thread *p; 414145516Sdarrenr# else 415145516Sdarrenrstruct proc *p; 416145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 417145516Sdarrenr#else 418145516Sdarrenr) 419145516Sdarrenr#endif 420145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 421145516Sdarrenrstruct cdev *dev; 422145516Sdarrenr#else 423145516Sdarrenrdev_t dev; 424145516Sdarrenr#endif 425145516Sdarrenrint flags; 426145516Sdarrenr{ 427145516Sdarrenr u_int min = GET_MINOR(dev); 428145516Sdarrenr 429145516Sdarrenr if (IPL_LOGMAX < min) 430145516Sdarrenr min = ENXIO; 431145516Sdarrenr else 432145516Sdarrenr min = 0; 433145516Sdarrenr return min; 434145516Sdarrenr} 435145516Sdarrenr 436145516Sdarrenr 437145516Sdarrenrint iplclose(dev, flags 438145516Sdarrenr#if ((BSD >= 199506) || (__FreeBSD_version >= 220000)) && defined(_KERNEL) 439145516Sdarrenr, devtype, p) 440145516Sdarrenrint devtype; 441145516Sdarrenr# if (__FreeBSD_version >= 500024) 442145516Sdarrenrstruct thread *p; 443145516Sdarrenr# else 444145516Sdarrenrstruct proc *p; 445145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 446145516Sdarrenr#else 447145516Sdarrenr) 448145516Sdarrenr#endif 449145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 450145516Sdarrenrstruct cdev *dev; 451145516Sdarrenr#else 452145516Sdarrenrdev_t dev; 453145516Sdarrenr#endif 454145516Sdarrenrint flags; 455145516Sdarrenr{ 456145516Sdarrenr u_int min = GET_MINOR(dev); 457145516Sdarrenr 458145516Sdarrenr if (IPL_LOGMAX < min) 459145516Sdarrenr min = ENXIO; 460145516Sdarrenr else 461145516Sdarrenr min = 0; 462145516Sdarrenr return min; 463145516Sdarrenr} 464145516Sdarrenr 465145516Sdarrenr/* 466145516Sdarrenr * iplread/ipllog 467145516Sdarrenr * both of these must operate with at least splnet() lest they be 468145516Sdarrenr * called during packet processing and cause an inconsistancy to appear in 469145516Sdarrenr * the filter lists. 470145516Sdarrenr */ 471145516Sdarrenr#if (BSD >= 199306) 472145516Sdarrenrint iplread(dev, uio, ioflag) 473145516Sdarrenrint ioflag; 474145516Sdarrenr#else 475145516Sdarrenrint iplread(dev, uio) 476145516Sdarrenr#endif 477145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 478145516Sdarrenrstruct cdev *dev; 479145516Sdarrenr#else 480145516Sdarrenrdev_t dev; 481145516Sdarrenr#endif 482145516Sdarrenrregister struct uio *uio; 483145516Sdarrenr{ 484161356Sguido u_int xmin = GET_MINOR(dev); 485145516Sdarrenr 486170268Sdarrenr if (fr_running < 1) 487170268Sdarrenr return EIO; 488170268Sdarrenr 489161356Sguido if (xmin < 0) 490161356Sguido return ENXIO; 491161356Sguido 492145516Sdarrenr# ifdef IPFILTER_SYNC 493161356Sguido if (xmin == IPL_LOGSYNC) 494145516Sdarrenr return ipfsync_read(uio); 495145516Sdarrenr# endif 496145516Sdarrenr 497145516Sdarrenr#ifdef IPFILTER_LOG 498161356Sguido return ipflog_read(xmin, uio); 499145516Sdarrenr#else 500145516Sdarrenr return ENXIO; 501145516Sdarrenr#endif 502145516Sdarrenr} 503145516Sdarrenr 504145516Sdarrenr 505145516Sdarrenr/* 506145516Sdarrenr * iplwrite 507145516Sdarrenr * both of these must operate with at least splnet() lest they be 508145516Sdarrenr * called during packet processing and cause an inconsistancy to appear in 509145516Sdarrenr * the filter lists. 510145516Sdarrenr */ 511145516Sdarrenr#if (BSD >= 199306) 512145516Sdarrenrint iplwrite(dev, uio, ioflag) 513145516Sdarrenrint ioflag; 514145516Sdarrenr#else 515145516Sdarrenrint iplwrite(dev, uio) 516145516Sdarrenr#endif 517145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 518145516Sdarrenrstruct cdev *dev; 519145516Sdarrenr#else 520145516Sdarrenrdev_t dev; 521145516Sdarrenr#endif 522145516Sdarrenrregister struct uio *uio; 523145516Sdarrenr{ 524145516Sdarrenr 525170268Sdarrenr if (fr_running < 1) 526170268Sdarrenr return EIO; 527170268Sdarrenr 528145516Sdarrenr#ifdef IPFILTER_SYNC 529145516Sdarrenr if (GET_MINOR(dev) == IPL_LOGSYNC) 530145516Sdarrenr return ipfsync_write(uio); 531145516Sdarrenr#endif 532145516Sdarrenr return ENXIO; 533145516Sdarrenr} 534145516Sdarrenr 535145516Sdarrenr 536145516Sdarrenr/* 537145516Sdarrenr * fr_send_reset - this could conceivably be a call to tcp_respond(), but that 538145516Sdarrenr * requires a large amount of setting up and isn't any more efficient. 539145516Sdarrenr */ 540145516Sdarrenrint fr_send_reset(fin) 541145516Sdarrenrfr_info_t *fin; 542145516Sdarrenr{ 543145516Sdarrenr struct tcphdr *tcp, *tcp2; 544145516Sdarrenr int tlen = 0, hlen; 545145516Sdarrenr struct mbuf *m; 546145516Sdarrenr#ifdef USE_INET6 547145516Sdarrenr ip6_t *ip6; 548145516Sdarrenr#endif 549145516Sdarrenr ip_t *ip; 550145516Sdarrenr 551145516Sdarrenr tcp = fin->fin_dp; 552145516Sdarrenr if (tcp->th_flags & TH_RST) 553145516Sdarrenr return -1; /* feedback loop */ 554145516Sdarrenr 555145516Sdarrenr if (fr_checkl4sum(fin) == -1) 556145516Sdarrenr return -1; 557145516Sdarrenr 558145516Sdarrenr tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) + 559145516Sdarrenr ((tcp->th_flags & TH_SYN) ? 1 : 0) + 560145516Sdarrenr ((tcp->th_flags & TH_FIN) ? 1 : 0); 561145516Sdarrenr 562145516Sdarrenr#ifdef USE_INET6 563145516Sdarrenr hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t); 564145516Sdarrenr#else 565145516Sdarrenr hlen = sizeof(ip_t); 566145516Sdarrenr#endif 567145516Sdarrenr#ifdef MGETHDR 568145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 569145516Sdarrenr#else 570145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 571145516Sdarrenr#endif 572145516Sdarrenr if (m == NULL) 573145516Sdarrenr return -1; 574145516Sdarrenr if (sizeof(*tcp2) + hlen > MLEN) { 575145516Sdarrenr MCLGET(m, M_DONTWAIT); 576145516Sdarrenr if ((m->m_flags & M_EXT) == 0) { 577145516Sdarrenr FREE_MB_T(m); 578145516Sdarrenr return -1; 579145516Sdarrenr } 580145516Sdarrenr } 581145516Sdarrenr 582145516Sdarrenr m->m_len = sizeof(*tcp2) + hlen; 583145516Sdarrenr#if (BSD >= 199103) 584145516Sdarrenr m->m_data += max_linkhdr; 585145516Sdarrenr m->m_pkthdr.len = m->m_len; 586145516Sdarrenr m->m_pkthdr.rcvif = (struct ifnet *)0; 587145516Sdarrenr#endif 588145516Sdarrenr ip = mtod(m, struct ip *); 589145516Sdarrenr bzero((char *)ip, hlen); 590145516Sdarrenr#ifdef USE_INET6 591145516Sdarrenr ip6 = (ip6_t *)ip; 592145516Sdarrenr#endif 593145516Sdarrenr tcp2 = (struct tcphdr *)((char *)ip + hlen); 594145516Sdarrenr tcp2->th_sport = tcp->th_dport; 595145516Sdarrenr tcp2->th_dport = tcp->th_sport; 596145516Sdarrenr 597145516Sdarrenr if (tcp->th_flags & TH_ACK) { 598145516Sdarrenr tcp2->th_seq = tcp->th_ack; 599145516Sdarrenr tcp2->th_flags = TH_RST; 600145516Sdarrenr tcp2->th_ack = 0; 601145516Sdarrenr } else { 602145516Sdarrenr tcp2->th_seq = 0; 603145516Sdarrenr tcp2->th_ack = ntohl(tcp->th_seq); 604145516Sdarrenr tcp2->th_ack += tlen; 605145516Sdarrenr tcp2->th_ack = htonl(tcp2->th_ack); 606145516Sdarrenr tcp2->th_flags = TH_RST|TH_ACK; 607145516Sdarrenr } 608145516Sdarrenr TCP_X2_A(tcp2, 0); 609145516Sdarrenr TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2); 610145516Sdarrenr tcp2->th_win = tcp->th_win; 611145516Sdarrenr tcp2->th_sum = 0; 612145516Sdarrenr tcp2->th_urp = 0; 613145516Sdarrenr 614145516Sdarrenr#ifdef USE_INET6 615145516Sdarrenr if (fin->fin_v == 6) { 616145516Sdarrenr ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 617145516Sdarrenr ip6->ip6_plen = htons(sizeof(struct tcphdr)); 618145516Sdarrenr ip6->ip6_nxt = IPPROTO_TCP; 619145516Sdarrenr ip6->ip6_hlim = 0; 620145516Sdarrenr ip6->ip6_src = fin->fin_dst6; 621145516Sdarrenr ip6->ip6_dst = fin->fin_src6; 622145516Sdarrenr tcp2->th_sum = in6_cksum(m, IPPROTO_TCP, 623145516Sdarrenr sizeof(*ip6), sizeof(*tcp2)); 624145516Sdarrenr return fr_send_ip(fin, m, &m); 625145516Sdarrenr } 626145516Sdarrenr#endif 627145516Sdarrenr ip->ip_p = IPPROTO_TCP; 628145516Sdarrenr ip->ip_len = htons(sizeof(struct tcphdr)); 629145516Sdarrenr ip->ip_src.s_addr = fin->fin_daddr; 630145516Sdarrenr ip->ip_dst.s_addr = fin->fin_saddr; 631145516Sdarrenr tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2)); 632145516Sdarrenr ip->ip_len = hlen + sizeof(*tcp2); 633145516Sdarrenr return fr_send_ip(fin, m, &m); 634145516Sdarrenr} 635145516Sdarrenr 636145516Sdarrenr 637145516Sdarrenrstatic int fr_send_ip(fin, m, mpp) 638145516Sdarrenrfr_info_t *fin; 639145516Sdarrenrmb_t *m, **mpp; 640145516Sdarrenr{ 641145516Sdarrenr fr_info_t fnew; 642145516Sdarrenr ip_t *ip, *oip; 643145516Sdarrenr int hlen; 644145516Sdarrenr 645145516Sdarrenr ip = mtod(m, ip_t *); 646145516Sdarrenr bzero((char *)&fnew, sizeof(fnew)); 647145516Sdarrenr 648145516Sdarrenr IP_V_A(ip, fin->fin_v); 649145516Sdarrenr switch (fin->fin_v) 650145516Sdarrenr { 651145516Sdarrenr case 4 : 652145516Sdarrenr fnew.fin_v = 4; 653145516Sdarrenr oip = fin->fin_ip; 654145516Sdarrenr IP_HL_A(ip, sizeof(*oip) >> 2); 655145516Sdarrenr ip->ip_tos = oip->ip_tos; 656145516Sdarrenr ip->ip_id = fin->fin_ip->ip_id; 657145516Sdarrenr#if (__FreeBSD_version > 460000) 658145516Sdarrenr ip->ip_off = path_mtu_discovery ? IP_DF : 0; 659145516Sdarrenr#else 660145516Sdarrenr ip->ip_off = 0; 661145516Sdarrenr#endif 662145516Sdarrenr ip->ip_ttl = ip_defttl; 663145516Sdarrenr ip->ip_sum = 0; 664145516Sdarrenr hlen = sizeof(*oip); 665145516Sdarrenr break; 666145516Sdarrenr#ifdef USE_INET6 667145516Sdarrenr case 6 : 668145516Sdarrenr { 669145516Sdarrenr ip6_t *ip6 = (ip6_t *)ip; 670145516Sdarrenr 671145516Sdarrenr ip6->ip6_vfc = 0x60; 672145516Sdarrenr ip6->ip6_hlim = IPDEFTTL; 673145516Sdarrenr 674145516Sdarrenr fnew.fin_v = 6; 675145516Sdarrenr hlen = sizeof(*ip6); 676145516Sdarrenr break; 677145516Sdarrenr } 678145516Sdarrenr#endif 679145516Sdarrenr default : 680145516Sdarrenr return EINVAL; 681145516Sdarrenr } 682145516Sdarrenr#ifdef IPSEC 683145516Sdarrenr m->m_pkthdr.rcvif = NULL; 684145516Sdarrenr#endif 685145516Sdarrenr 686145516Sdarrenr fnew.fin_ifp = fin->fin_ifp; 687145516Sdarrenr fnew.fin_flx = FI_NOCKSUM; 688145516Sdarrenr fnew.fin_m = m; 689145516Sdarrenr fnew.fin_ip = ip; 690145516Sdarrenr fnew.fin_mp = mpp; 691145516Sdarrenr fnew.fin_hlen = hlen; 692145516Sdarrenr fnew.fin_dp = (char *)ip + hlen; 693145516Sdarrenr (void) fr_makefrip(hlen, ip, &fnew); 694145516Sdarrenr 695145516Sdarrenr return fr_fastroute(m, mpp, &fnew, NULL); 696145516Sdarrenr} 697145516Sdarrenr 698145516Sdarrenr 699145516Sdarrenrint fr_send_icmp_err(type, fin, dst) 700145516Sdarrenrint type; 701145516Sdarrenrfr_info_t *fin; 702145516Sdarrenrint dst; 703145516Sdarrenr{ 704145516Sdarrenr int err, hlen, xtra, iclen, ohlen, avail, code; 705145516Sdarrenr struct in_addr dst4; 706145516Sdarrenr struct icmp *icmp; 707145516Sdarrenr struct mbuf *m; 708145516Sdarrenr void *ifp; 709145516Sdarrenr#ifdef USE_INET6 710145516Sdarrenr ip6_t *ip6; 711145516Sdarrenr struct in6_addr dst6; 712145516Sdarrenr#endif 713145516Sdarrenr ip_t *ip, *ip2; 714145516Sdarrenr 715172776Sdarrenr if ((type < 0) || (type >= ICMP_MAXTYPE)) 716145516Sdarrenr return -1; 717145516Sdarrenr 718145516Sdarrenr code = fin->fin_icode; 719145516Sdarrenr#ifdef USE_INET6 720145516Sdarrenr if ((code < 0) || (code > sizeof(icmptoicmp6unreach)/sizeof(int))) 721145516Sdarrenr return -1; 722145516Sdarrenr#endif 723145516Sdarrenr 724145516Sdarrenr if (fr_checkl4sum(fin) == -1) 725145516Sdarrenr return -1; 726145516Sdarrenr#ifdef MGETHDR 727145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 728145516Sdarrenr#else 729145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 730145516Sdarrenr#endif 731145516Sdarrenr if (m == NULL) 732145516Sdarrenr return -1; 733145516Sdarrenr avail = MHLEN; 734145516Sdarrenr 735145516Sdarrenr xtra = 0; 736145516Sdarrenr hlen = 0; 737145516Sdarrenr ohlen = 0; 738145516Sdarrenr ifp = fin->fin_ifp; 739145516Sdarrenr if (fin->fin_v == 4) { 740145516Sdarrenr if ((fin->fin_p == IPPROTO_ICMP) && 741145516Sdarrenr !(fin->fin_flx & FI_SHORT)) 742145516Sdarrenr switch (ntohs(fin->fin_data[0]) >> 8) 743145516Sdarrenr { 744145516Sdarrenr case ICMP_ECHO : 745145516Sdarrenr case ICMP_TSTAMP : 746145516Sdarrenr case ICMP_IREQ : 747145516Sdarrenr case ICMP_MASKREQ : 748145516Sdarrenr break; 749145516Sdarrenr default : 750145516Sdarrenr FREE_MB_T(m); 751145516Sdarrenr return 0; 752145516Sdarrenr } 753145516Sdarrenr 754145516Sdarrenr if (dst == 0) { 755145516Sdarrenr if (fr_ifpaddr(4, FRI_NORMAL, ifp, 756145516Sdarrenr &dst4, NULL) == -1) { 757145516Sdarrenr FREE_MB_T(m); 758145516Sdarrenr return -1; 759145516Sdarrenr } 760145516Sdarrenr } else 761145516Sdarrenr dst4.s_addr = fin->fin_daddr; 762145516Sdarrenr 763145516Sdarrenr hlen = sizeof(ip_t); 764145516Sdarrenr ohlen = fin->fin_hlen; 765145516Sdarrenr if (fin->fin_hlen < fin->fin_plen) 766145516Sdarrenr xtra = MIN(fin->fin_dlen, 8); 767145516Sdarrenr else 768145516Sdarrenr xtra = 0; 769145516Sdarrenr } 770145516Sdarrenr 771145516Sdarrenr#ifdef USE_INET6 772145516Sdarrenr else if (fin->fin_v == 6) { 773145516Sdarrenr hlen = sizeof(ip6_t); 774145516Sdarrenr ohlen = sizeof(ip6_t); 775145516Sdarrenr type = icmptoicmp6types[type]; 776145516Sdarrenr if (type == ICMP6_DST_UNREACH) 777145516Sdarrenr code = icmptoicmp6unreach[code]; 778145516Sdarrenr 779145516Sdarrenr if (hlen + sizeof(*icmp) + max_linkhdr + 780145516Sdarrenr fin->fin_plen > avail) { 781145516Sdarrenr MCLGET(m, M_DONTWAIT); 782145516Sdarrenr if ((m->m_flags & M_EXT) == 0) { 783145516Sdarrenr FREE_MB_T(m); 784145516Sdarrenr return -1; 785145516Sdarrenr } 786145516Sdarrenr avail = MCLBYTES; 787145516Sdarrenr } 788145516Sdarrenr xtra = MIN(fin->fin_plen, 789145516Sdarrenr avail - hlen - sizeof(*icmp) - max_linkhdr); 790145516Sdarrenr if (dst == 0) { 791145516Sdarrenr if (fr_ifpaddr(6, FRI_NORMAL, ifp, 792145516Sdarrenr (struct in_addr *)&dst6, NULL) == -1) { 793145516Sdarrenr FREE_MB_T(m); 794145516Sdarrenr return -1; 795145516Sdarrenr } 796145516Sdarrenr } else 797145516Sdarrenr dst6 = fin->fin_dst6; 798145516Sdarrenr } 799145516Sdarrenr#endif 800145516Sdarrenr else { 801145516Sdarrenr FREE_MB_T(m); 802145516Sdarrenr return -1; 803145516Sdarrenr } 804145516Sdarrenr 805145516Sdarrenr iclen = hlen + sizeof(*icmp); 806145516Sdarrenr avail -= (max_linkhdr + iclen); 807145516Sdarrenr if (avail < 0) { 808145516Sdarrenr FREE_MB_T(m); 809145516Sdarrenr return -1; 810145516Sdarrenr } 811145516Sdarrenr if (xtra > avail) 812145516Sdarrenr xtra = avail; 813145516Sdarrenr iclen += xtra; 814145516Sdarrenr m->m_data += max_linkhdr; 815145516Sdarrenr m->m_pkthdr.rcvif = (struct ifnet *)0; 816145516Sdarrenr m->m_pkthdr.len = iclen; 817145516Sdarrenr m->m_len = iclen; 818145516Sdarrenr ip = mtod(m, ip_t *); 819145516Sdarrenr icmp = (struct icmp *)((char *)ip + hlen); 820145516Sdarrenr ip2 = (ip_t *)&icmp->icmp_ip; 821145516Sdarrenr 822145516Sdarrenr icmp->icmp_type = type; 823145516Sdarrenr icmp->icmp_code = fin->fin_icode; 824145516Sdarrenr icmp->icmp_cksum = 0; 825145516Sdarrenr#ifdef icmp_nextmtu 826145516Sdarrenr if (type == ICMP_UNREACH && 827145516Sdarrenr fin->fin_icode == ICMP_UNREACH_NEEDFRAG && ifp) 828145516Sdarrenr icmp->icmp_nextmtu = htons(((struct ifnet *)ifp)->if_mtu); 829145516Sdarrenr#endif 830145516Sdarrenr 831145516Sdarrenr bcopy((char *)fin->fin_ip, (char *)ip2, ohlen); 832145516Sdarrenr 833145516Sdarrenr#ifdef USE_INET6 834145516Sdarrenr ip6 = (ip6_t *)ip; 835145516Sdarrenr if (fin->fin_v == 6) { 836145516Sdarrenr ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 837145516Sdarrenr ip6->ip6_plen = htons(iclen - hlen); 838145516Sdarrenr ip6->ip6_nxt = IPPROTO_ICMPV6; 839145516Sdarrenr ip6->ip6_hlim = 0; 840145516Sdarrenr ip6->ip6_src = dst6; 841145516Sdarrenr ip6->ip6_dst = fin->fin_src6; 842145516Sdarrenr if (xtra > 0) 843145516Sdarrenr bcopy((char *)fin->fin_ip + ohlen, 844145516Sdarrenr (char *)&icmp->icmp_ip + ohlen, xtra); 845145516Sdarrenr icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6, 846145516Sdarrenr sizeof(*ip6), iclen - hlen); 847145516Sdarrenr } else 848145516Sdarrenr#endif 849145516Sdarrenr { 850145516Sdarrenr ip2->ip_len = htons(ip2->ip_len); 851145516Sdarrenr ip2->ip_off = htons(ip2->ip_off); 852145516Sdarrenr ip->ip_p = IPPROTO_ICMP; 853145516Sdarrenr ip->ip_src.s_addr = dst4.s_addr; 854145516Sdarrenr ip->ip_dst.s_addr = fin->fin_saddr; 855145516Sdarrenr 856145516Sdarrenr if (xtra > 0) 857145516Sdarrenr bcopy((char *)fin->fin_ip + ohlen, 858145516Sdarrenr (char *)&icmp->icmp_ip + ohlen, xtra); 859145516Sdarrenr icmp->icmp_cksum = ipf_cksum((u_short *)icmp, 860145516Sdarrenr sizeof(*icmp) + 8); 861145516Sdarrenr ip->ip_len = iclen; 862145516Sdarrenr ip->ip_p = IPPROTO_ICMP; 863145516Sdarrenr } 864145516Sdarrenr err = fr_send_ip(fin, m, &m); 865145516Sdarrenr return err; 866145516Sdarrenr} 867145516Sdarrenr 868145516Sdarrenr 869145516Sdarrenr#if !defined(IPFILTER_LKM) && (__FreeBSD_version < 300000) 870145516Sdarrenr# if (BSD < 199306) 871145516Sdarrenrint iplinit __P((void)); 872145516Sdarrenr 873145516Sdarrenrint 874145516Sdarrenr# else 875145516Sdarrenrvoid iplinit __P((void)); 876145516Sdarrenr 877145516Sdarrenrvoid 878145516Sdarrenr# endif 879145516Sdarrenriplinit() 880145516Sdarrenr{ 881170268Sdarrenr if (ipfattach() != 0) 882145516Sdarrenr printf("IP Filter failed to attach\n"); 883145516Sdarrenr ip_init(); 884145516Sdarrenr} 885145516Sdarrenr#endif /* __FreeBSD_version < 300000 */ 886145516Sdarrenr 887145516Sdarrenr 888145516Sdarrenrint fr_fastroute(m0, mpp, fin, fdp) 889145516Sdarrenrmb_t *m0, **mpp; 890145516Sdarrenrfr_info_t *fin; 891145516Sdarrenrfrdest_t *fdp; 892145516Sdarrenr{ 893145516Sdarrenr register struct ip *ip, *mhip; 894145516Sdarrenr register struct mbuf *m = m0; 895145516Sdarrenr register struct route *ro; 896145516Sdarrenr int len, off, error = 0, hlen, code; 897145516Sdarrenr struct ifnet *ifp, *sifp; 898145516Sdarrenr struct sockaddr_in *dst; 899145516Sdarrenr struct route iproute; 900145516Sdarrenr u_short ip_off; 901145516Sdarrenr frentry_t *fr; 902145516Sdarrenr 903161356Sguido ro = NULL; 904161356Sguido 905145516Sdarrenr#ifdef M_WRITABLE 906145516Sdarrenr /* 907145516Sdarrenr * HOT FIX/KLUDGE: 908145516Sdarrenr * 909145516Sdarrenr * If the mbuf we're about to send is not writable (because of 910145516Sdarrenr * a cluster reference, for example) we'll need to make a copy 911145516Sdarrenr * of it since this routine modifies the contents. 912145516Sdarrenr * 913145516Sdarrenr * If you have non-crappy network hardware that can transmit data 914145516Sdarrenr * from the mbuf, rather than making a copy, this is gonna be a 915145516Sdarrenr * problem. 916145516Sdarrenr */ 917145516Sdarrenr if (M_WRITABLE(m) == 0) { 918161356Sguido m0 = m_dup(m, M_DONTWAIT); 919161356Sguido if (m0 != 0) { 920145516Sdarrenr FREE_MB_T(m); 921145516Sdarrenr m = m0; 922145516Sdarrenr *mpp = m; 923145516Sdarrenr } else { 924145516Sdarrenr error = ENOBUFS; 925145516Sdarrenr FREE_MB_T(m); 926161356Sguido goto done; 927145516Sdarrenr } 928145516Sdarrenr } 929145516Sdarrenr#endif 930145516Sdarrenr 931145516Sdarrenr#ifdef USE_INET6 932145516Sdarrenr if (fin->fin_v == 6) { 933145516Sdarrenr /* 934145516Sdarrenr * currently "to <if>" and "to <if>:ip#" are not supported 935145516Sdarrenr * for IPv6 936145516Sdarrenr */ 937145516Sdarrenr#if (__FreeBSD_version >= 490000) 938145516Sdarrenr return ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 939145516Sdarrenr#else 940145516Sdarrenr return ip6_output(m0, NULL, NULL, 0, NULL, NULL); 941145516Sdarrenr#endif 942145516Sdarrenr } 943145516Sdarrenr#endif 944145516Sdarrenr 945145516Sdarrenr hlen = fin->fin_hlen; 946145516Sdarrenr ip = mtod(m0, struct ip *); 947145516Sdarrenr 948145516Sdarrenr /* 949145516Sdarrenr * Route packet. 950145516Sdarrenr */ 951145516Sdarrenr ro = &iproute; 952145516Sdarrenr bzero((caddr_t)ro, sizeof (*ro)); 953145516Sdarrenr dst = (struct sockaddr_in *)&ro->ro_dst; 954145516Sdarrenr dst->sin_family = AF_INET; 955145516Sdarrenr dst->sin_addr = ip->ip_dst; 956145516Sdarrenr 957145516Sdarrenr fr = fin->fin_fr; 958145516Sdarrenr if (fdp != NULL) 959145516Sdarrenr ifp = fdp->fd_ifp; 960145516Sdarrenr else 961145516Sdarrenr ifp = fin->fin_ifp; 962145516Sdarrenr 963145516Sdarrenr if ((ifp == NULL) && (!fr || !(fr->fr_flags & FR_FASTROUTE))) { 964145516Sdarrenr error = -2; 965145516Sdarrenr goto bad; 966145516Sdarrenr } 967145516Sdarrenr 968161356Sguido if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 969161356Sguido dst->sin_addr = fdp->fd_ip; 970145516Sdarrenr 971145516Sdarrenr dst->sin_len = sizeof(*dst); 972145516Sdarrenr rtalloc(ro); 973145516Sdarrenr 974145516Sdarrenr if ((ifp == NULL) && (ro->ro_rt != NULL)) 975145516Sdarrenr ifp = ro->ro_rt->rt_ifp; 976145516Sdarrenr 977145516Sdarrenr if ((ro->ro_rt == NULL) || (ifp == NULL)) { 978145516Sdarrenr if (in_localaddr(ip->ip_dst)) 979145516Sdarrenr error = EHOSTUNREACH; 980145516Sdarrenr else 981145516Sdarrenr error = ENETUNREACH; 982145516Sdarrenr goto bad; 983145516Sdarrenr } 984145516Sdarrenr if (ro->ro_rt->rt_flags & RTF_GATEWAY) 985145516Sdarrenr dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; 986145516Sdarrenr if (ro->ro_rt) 987145516Sdarrenr ro->ro_rt->rt_use++; 988145516Sdarrenr 989145516Sdarrenr /* 990145516Sdarrenr * For input packets which are being "fastrouted", they won't 991145516Sdarrenr * go back through output filtering and miss their chance to get 992170268Sdarrenr * NAT'd and counted. Duplicated packets aren't considered to be 993170268Sdarrenr * part of the normal packet stream, so do not NAT them or pass 994170268Sdarrenr * them through stateful checking, etc. 995145516Sdarrenr */ 996170268Sdarrenr if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) { 997145516Sdarrenr sifp = fin->fin_ifp; 998145516Sdarrenr fin->fin_ifp = ifp; 999145516Sdarrenr fin->fin_out = 1; 1000145516Sdarrenr (void) fr_acctpkt(fin, NULL); 1001145516Sdarrenr fin->fin_fr = NULL; 1002145516Sdarrenr if (!fr || !(fr->fr_flags & FR_RETMASK)) { 1003145516Sdarrenr u_32_t pass; 1004145516Sdarrenr 1005170268Sdarrenr if (fr_checkstate(fin, &pass) != NULL) 1006170268Sdarrenr fr_statederef((ipstate_t **)&fin->fin_state); 1007145516Sdarrenr } 1008145516Sdarrenr 1009145516Sdarrenr switch (fr_checknatout(fin, NULL)) 1010145516Sdarrenr { 1011145516Sdarrenr case 0 : 1012145516Sdarrenr break; 1013145516Sdarrenr case 1 : 1014170268Sdarrenr fr_natderef((nat_t **)&fin->fin_nat); 1015145516Sdarrenr ip->ip_sum = 0; 1016145516Sdarrenr break; 1017145516Sdarrenr case -1 : 1018145516Sdarrenr error = -1; 1019145516Sdarrenr goto done; 1020145516Sdarrenr break; 1021145516Sdarrenr } 1022145516Sdarrenr 1023145516Sdarrenr fin->fin_ifp = sifp; 1024145516Sdarrenr fin->fin_out = 0; 1025145516Sdarrenr } else 1026145516Sdarrenr ip->ip_sum = 0; 1027145516Sdarrenr /* 1028145516Sdarrenr * If small enough for interface, can just send directly. 1029145516Sdarrenr */ 1030145516Sdarrenr if (ip->ip_len <= ifp->if_mtu) { 1031145516Sdarrenr ip->ip_len = htons(ip->ip_len); 1032145516Sdarrenr ip->ip_off = htons(ip->ip_off); 1033145516Sdarrenr 1034145516Sdarrenr if (!ip->ip_sum) 1035145516Sdarrenr ip->ip_sum = in_cksum(m, hlen); 1036145516Sdarrenr error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, 1037145516Sdarrenr ro->ro_rt); 1038145516Sdarrenr goto done; 1039145516Sdarrenr } 1040145516Sdarrenr /* 1041145516Sdarrenr * Too large for interface; fragment if possible. 1042145516Sdarrenr * Must be able to put at least 8 bytes per fragment. 1043145516Sdarrenr */ 1044145516Sdarrenr ip_off = ntohs(ip->ip_off); 1045145516Sdarrenr if (ip_off & IP_DF) { 1046145516Sdarrenr error = EMSGSIZE; 1047145516Sdarrenr goto bad; 1048145516Sdarrenr } 1049145516Sdarrenr len = (ifp->if_mtu - hlen) &~ 7; 1050145516Sdarrenr if (len < 8) { 1051145516Sdarrenr error = EMSGSIZE; 1052145516Sdarrenr goto bad; 1053145516Sdarrenr } 1054145516Sdarrenr 1055145516Sdarrenr { 1056145516Sdarrenr int mhlen, firstlen = len; 1057145516Sdarrenr struct mbuf **mnext = &m->m_act; 1058145516Sdarrenr 1059145516Sdarrenr /* 1060145516Sdarrenr * Loop through length of segment after first fragment, 1061145516Sdarrenr * make new header and copy data of each part and link onto chain. 1062145516Sdarrenr */ 1063145516Sdarrenr m0 = m; 1064145516Sdarrenr mhlen = sizeof (struct ip); 1065145516Sdarrenr for (off = hlen + len; off < ip->ip_len; off += len) { 1066145516Sdarrenr#ifdef MGETHDR 1067145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 1068145516Sdarrenr#else 1069145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 1070145516Sdarrenr#endif 1071145516Sdarrenr if (m == 0) { 1072145516Sdarrenr m = m0; 1073145516Sdarrenr error = ENOBUFS; 1074145516Sdarrenr goto bad; 1075145516Sdarrenr } 1076145516Sdarrenr m->m_data += max_linkhdr; 1077145516Sdarrenr mhip = mtod(m, struct ip *); 1078145516Sdarrenr bcopy((char *)ip, (char *)mhip, sizeof(*ip)); 1079145516Sdarrenr if (hlen > sizeof (struct ip)) { 1080145516Sdarrenr mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 1081145516Sdarrenr IP_HL_A(mhip, mhlen >> 2); 1082145516Sdarrenr } 1083145516Sdarrenr m->m_len = mhlen; 1084145516Sdarrenr mhip->ip_off = ((off - hlen) >> 3) + ip_off; 1085145516Sdarrenr if (off + len >= ip->ip_len) 1086145516Sdarrenr len = ip->ip_len - off; 1087145516Sdarrenr else 1088145516Sdarrenr mhip->ip_off |= IP_MF; 1089145516Sdarrenr mhip->ip_len = htons((u_short)(len + mhlen)); 1090161356Sguido *mnext = m; 1091145516Sdarrenr m->m_next = m_copy(m0, off, len); 1092145516Sdarrenr if (m->m_next == 0) { 1093145516Sdarrenr error = ENOBUFS; /* ??? */ 1094145516Sdarrenr goto sendorfree; 1095145516Sdarrenr } 1096145516Sdarrenr m->m_pkthdr.len = mhlen + len; 1097145516Sdarrenr m->m_pkthdr.rcvif = NULL; 1098145516Sdarrenr mhip->ip_off = htons((u_short)mhip->ip_off); 1099145516Sdarrenr mhip->ip_sum = 0; 1100145516Sdarrenr mhip->ip_sum = in_cksum(m, mhlen); 1101145516Sdarrenr mnext = &m->m_act; 1102145516Sdarrenr } 1103145516Sdarrenr /* 1104145516Sdarrenr * Update first fragment by trimming what's been copied out 1105145516Sdarrenr * and updating header, then send each fragment (in order). 1106145516Sdarrenr */ 1107145516Sdarrenr m_adj(m0, hlen + firstlen - ip->ip_len); 1108145516Sdarrenr ip->ip_len = htons((u_short)(hlen + firstlen)); 1109145516Sdarrenr ip->ip_off = htons((u_short)IP_MF); 1110145516Sdarrenr ip->ip_sum = 0; 1111145516Sdarrenr ip->ip_sum = in_cksum(m0, hlen); 1112145516Sdarrenrsendorfree: 1113145516Sdarrenr for (m = m0; m; m = m0) { 1114145516Sdarrenr m0 = m->m_act; 1115145516Sdarrenr m->m_act = 0; 1116145516Sdarrenr if (error == 0) 1117145516Sdarrenr error = (*ifp->if_output)(ifp, m, 1118145516Sdarrenr (struct sockaddr *)dst, ro->ro_rt); 1119145516Sdarrenr else 1120145516Sdarrenr FREE_MB_T(m); 1121145516Sdarrenr } 1122145516Sdarrenr } 1123145516Sdarrenrdone: 1124145516Sdarrenr if (!error) 1125145516Sdarrenr fr_frouteok[0]++; 1126145516Sdarrenr else 1127145516Sdarrenr fr_frouteok[1]++; 1128145516Sdarrenr 1129161356Sguido if ((ro != NULL) && (ro->ro_rt != NULL)) { 1130145516Sdarrenr RTFREE(ro->ro_rt); 1131145516Sdarrenr } 1132145516Sdarrenr *mpp = NULL; 1133145516Sdarrenr return 0; 1134145516Sdarrenrbad: 1135145516Sdarrenr if (error == EMSGSIZE) { 1136145516Sdarrenr sifp = fin->fin_ifp; 1137145516Sdarrenr code = fin->fin_icode; 1138145516Sdarrenr fin->fin_icode = ICMP_UNREACH_NEEDFRAG; 1139145516Sdarrenr fin->fin_ifp = ifp; 1140145516Sdarrenr (void) fr_send_icmp_err(ICMP_UNREACH, fin, 1); 1141145516Sdarrenr fin->fin_ifp = sifp; 1142145516Sdarrenr fin->fin_icode = code; 1143145516Sdarrenr } 1144145516Sdarrenr FREE_MB_T(m); 1145145516Sdarrenr goto done; 1146145516Sdarrenr} 1147145516Sdarrenr 1148145516Sdarrenr 1149145516Sdarrenrint fr_verifysrc(fin) 1150145516Sdarrenrfr_info_t *fin; 1151145516Sdarrenr{ 1152145516Sdarrenr struct sockaddr_in *dst; 1153145516Sdarrenr struct route iproute; 1154145516Sdarrenr 1155145516Sdarrenr bzero((char *)&iproute, sizeof(iproute)); 1156145516Sdarrenr dst = (struct sockaddr_in *)&iproute.ro_dst; 1157145516Sdarrenr dst->sin_len = sizeof(*dst); 1158145516Sdarrenr dst->sin_family = AF_INET; 1159145516Sdarrenr dst->sin_addr = fin->fin_src; 1160145516Sdarrenr rtalloc(&iproute); 1161145516Sdarrenr if (iproute.ro_rt == NULL) 1162145516Sdarrenr return 0; 1163145516Sdarrenr return (fin->fin_ifp == iproute.ro_rt->rt_ifp); 1164145516Sdarrenr} 1165145516Sdarrenr 1166145516Sdarrenr 1167145516Sdarrenr/* 1168145516Sdarrenr * return the first IP Address associated with an interface 1169145516Sdarrenr */ 1170145516Sdarrenrint fr_ifpaddr(v, atype, ifptr, inp, inpmask) 1171145516Sdarrenrint v, atype; 1172145516Sdarrenrvoid *ifptr; 1173145516Sdarrenrstruct in_addr *inp, *inpmask; 1174145516Sdarrenr{ 1175145516Sdarrenr#ifdef USE_INET6 1176145516Sdarrenr struct in6_addr *inp6 = NULL; 1177145516Sdarrenr#endif 1178145516Sdarrenr struct sockaddr *sock, *mask; 1179145516Sdarrenr struct sockaddr_in *sin; 1180145516Sdarrenr struct ifaddr *ifa; 1181145516Sdarrenr struct ifnet *ifp; 1182145516Sdarrenr 1183145516Sdarrenr if ((ifptr == NULL) || (ifptr == (void *)-1)) 1184145516Sdarrenr return -1; 1185145516Sdarrenr 1186145516Sdarrenr sin = NULL; 1187145516Sdarrenr ifp = ifptr; 1188145516Sdarrenr 1189145516Sdarrenr if (v == 4) 1190145516Sdarrenr inp->s_addr = 0; 1191145516Sdarrenr#ifdef USE_INET6 1192145516Sdarrenr else if (v == 6) 1193145516Sdarrenr bzero((char *)inp, sizeof(struct in6_addr)); 1194145516Sdarrenr#endif 1195145516Sdarrenr#if (__FreeBSD_version >= 300000) 1196145516Sdarrenr ifa = TAILQ_FIRST(&ifp->if_addrhead); 1197145516Sdarrenr#else 1198145516Sdarrenr ifa = ifp->if_addrlist; 1199145516Sdarrenr#endif /* __FreeBSD_version >= 300000 */ 1200145516Sdarrenr 1201145516Sdarrenr sock = ifa->ifa_addr; 1202145516Sdarrenr while (sock != NULL && ifa != NULL) { 1203145516Sdarrenr sin = (struct sockaddr_in *)sock; 1204145516Sdarrenr if ((v == 4) && (sin->sin_family == AF_INET)) 1205145516Sdarrenr break; 1206145516Sdarrenr#ifdef USE_INET6 1207145516Sdarrenr if ((v == 6) && (sin->sin_family == AF_INET6)) { 1208145516Sdarrenr inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; 1209145516Sdarrenr if (!IN6_IS_ADDR_LINKLOCAL(inp6) && 1210145516Sdarrenr !IN6_IS_ADDR_LOOPBACK(inp6)) 1211145516Sdarrenr break; 1212145516Sdarrenr } 1213145516Sdarrenr#endif 1214145516Sdarrenr#if (__FreeBSD_version >= 300000) 1215145516Sdarrenr ifa = TAILQ_NEXT(ifa, ifa_link); 1216145516Sdarrenr#else 1217145516Sdarrenr ifa = ifa->ifa_next; 1218145516Sdarrenr#endif /* __FreeBSD_version >= 300000 */ 1219145516Sdarrenr if (ifa != NULL) 1220145516Sdarrenr sock = ifa->ifa_addr; 1221145516Sdarrenr } 1222145516Sdarrenr 1223145516Sdarrenr if (ifa == NULL || sin == NULL) 1224145516Sdarrenr return -1; 1225145516Sdarrenr 1226145516Sdarrenr mask = ifa->ifa_netmask; 1227145516Sdarrenr if (atype == FRI_BROADCAST) 1228145516Sdarrenr sock = ifa->ifa_broadaddr; 1229145516Sdarrenr else if (atype == FRI_PEERADDR) 1230145516Sdarrenr sock = ifa->ifa_dstaddr; 1231145516Sdarrenr 1232161356Sguido if (sock == NULL) 1233161356Sguido return -1; 1234161356Sguido 1235145516Sdarrenr#ifdef USE_INET6 1236145516Sdarrenr if (v == 6) { 1237145516Sdarrenr return fr_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock, 1238145516Sdarrenr (struct sockaddr_in6 *)mask, 1239145516Sdarrenr inp, inpmask); 1240145516Sdarrenr } 1241145516Sdarrenr#endif 1242145516Sdarrenr return fr_ifpfillv4addr(atype, (struct sockaddr_in *)sock, 1243145516Sdarrenr (struct sockaddr_in *)mask, inp, inpmask); 1244145516Sdarrenr} 1245145516Sdarrenr 1246145516Sdarrenr 1247145516Sdarrenru_32_t fr_newisn(fin) 1248145516Sdarrenrfr_info_t *fin; 1249145516Sdarrenr{ 1250145516Sdarrenr u_32_t newiss; 1251145516Sdarrenr#if (__FreeBSD_version >= 400000) 1252145516Sdarrenr newiss = arc4random(); 1253145516Sdarrenr#else 1254145516Sdarrenr static iss_seq_off = 0; 1255145516Sdarrenr u_char hash[16]; 1256145516Sdarrenr MD5_CTX ctx; 1257145516Sdarrenr 1258145516Sdarrenr /* 1259145516Sdarrenr * Compute the base value of the ISS. It is a hash 1260145516Sdarrenr * of (saddr, sport, daddr, dport, secret). 1261145516Sdarrenr */ 1262145516Sdarrenr MD5Init(&ctx); 1263145516Sdarrenr 1264145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, 1265145516Sdarrenr sizeof(fin->fin_fi.fi_src)); 1266145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, 1267145516Sdarrenr sizeof(fin->fin_fi.fi_dst)); 1268145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); 1269145516Sdarrenr 1270145516Sdarrenr MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret)); 1271145516Sdarrenr 1272145516Sdarrenr MD5Final(hash, &ctx); 1273145516Sdarrenr 1274145516Sdarrenr memcpy(&newiss, hash, sizeof(newiss)); 1275145516Sdarrenr 1276145516Sdarrenr /* 1277145516Sdarrenr * Now increment our "timer", and add it in to 1278145516Sdarrenr * the computed value. 1279145516Sdarrenr * 1280145516Sdarrenr * XXX Use `addin'? 1281145516Sdarrenr * XXX TCP_ISSINCR too large to use? 1282145516Sdarrenr */ 1283145516Sdarrenr iss_seq_off += 0x00010000; 1284145516Sdarrenr newiss += iss_seq_off; 1285145516Sdarrenr#endif 1286145516Sdarrenr return newiss; 1287145516Sdarrenr} 1288145516Sdarrenr 1289145516Sdarrenr 1290145516Sdarrenr/* ------------------------------------------------------------------------ */ 1291145516Sdarrenr/* Function: fr_nextipid */ 1292145516Sdarrenr/* Returns: int - 0 == success, -1 == error (packet should be droppped) */ 1293145516Sdarrenr/* Parameters: fin(I) - pointer to packet information */ 1294145516Sdarrenr/* */ 1295145516Sdarrenr/* Returns the next IPv4 ID to use for this packet. */ 1296145516Sdarrenr/* ------------------------------------------------------------------------ */ 1297145516Sdarrenru_short fr_nextipid(fin) 1298145516Sdarrenrfr_info_t *fin; 1299145516Sdarrenr{ 1300145516Sdarrenr#ifndef RANDOM_IP_ID 1301145516Sdarrenr static u_short ipid = 0; 1302145516Sdarrenr u_short id; 1303145516Sdarrenr 1304145516Sdarrenr MUTEX_ENTER(&ipf_rw); 1305145516Sdarrenr id = ipid++; 1306145516Sdarrenr MUTEX_EXIT(&ipf_rw); 1307145516Sdarrenr#else 1308145516Sdarrenr u_short id; 1309145516Sdarrenr 1310145516Sdarrenr id = ip_randomid(); 1311145516Sdarrenr#endif 1312145516Sdarrenr 1313145516Sdarrenr return id; 1314145516Sdarrenr} 1315145516Sdarrenr 1316145516Sdarrenr 1317145516SdarrenrINLINE void fr_checkv4sum(fin) 1318145516Sdarrenrfr_info_t *fin; 1319145516Sdarrenr{ 1320145516Sdarrenr#ifdef CSUM_DATA_VALID 1321145516Sdarrenr int manual = 0; 1322145516Sdarrenr u_short sum; 1323145516Sdarrenr ip_t *ip; 1324145516Sdarrenr mb_t *m; 1325145516Sdarrenr 1326145516Sdarrenr if ((fin->fin_flx & FI_NOCKSUM) != 0) 1327145516Sdarrenr return; 1328145516Sdarrenr 1329172776Sdarrenr if (fin->fin_cksum != 0) 1330172776Sdarrenr return; 1331172776Sdarrenr 1332145516Sdarrenr m = fin->fin_m; 1333145516Sdarrenr if (m == NULL) { 1334145516Sdarrenr manual = 1; 1335145516Sdarrenr goto skipauto; 1336145516Sdarrenr } 1337145516Sdarrenr ip = fin->fin_ip; 1338145516Sdarrenr 1339145516Sdarrenr if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 1340145516Sdarrenr if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 1341145516Sdarrenr sum = m->m_pkthdr.csum_data; 1342145516Sdarrenr else 1343145516Sdarrenr sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, 1344145516Sdarrenr htonl(m->m_pkthdr.csum_data + 1345145516Sdarrenr fin->fin_ip->ip_len + fin->fin_p)); 1346145516Sdarrenr sum ^= 0xffff; 1347172776Sdarrenr if (sum != 0) { 1348145516Sdarrenr fin->fin_flx |= FI_BAD; 1349172776Sdarrenr fin->fin_cksum = -1; 1350172776Sdarrenr } else { 1351172776Sdarrenr fin->fin_cksum = 1; 1352172776Sdarrenr } 1353145516Sdarrenr } else 1354145516Sdarrenr manual = 1; 1355145516Sdarrenrskipauto: 1356145516Sdarrenr# ifdef IPFILTER_CKSUM 1357145516Sdarrenr if (manual != 0) 1358145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1359145516Sdarrenr fin->fin_flx |= FI_BAD; 1360145516Sdarrenr# else 1361145516Sdarrenr ; 1362145516Sdarrenr# endif 1363145516Sdarrenr#else 1364145516Sdarrenr# ifdef IPFILTER_CKSUM 1365145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1366145516Sdarrenr fin->fin_flx |= FI_BAD; 1367145516Sdarrenr# endif 1368145516Sdarrenr#endif 1369145516Sdarrenr} 1370145516Sdarrenr 1371145516Sdarrenr 1372145516Sdarrenr#ifdef USE_INET6 1373145516SdarrenrINLINE void fr_checkv6sum(fin) 1374145516Sdarrenrfr_info_t *fin; 1375145516Sdarrenr{ 1376145516Sdarrenr# ifdef IPFILTER_CKSUM 1377145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1378145516Sdarrenr fin->fin_flx |= FI_BAD; 1379145516Sdarrenr# endif 1380145516Sdarrenr} 1381145516Sdarrenr#endif /* USE_INET6 */ 1382145516Sdarrenr 1383145516Sdarrenr 1384145516Sdarrenrsize_t mbufchainlen(m0) 1385145516Sdarrenrstruct mbuf *m0; 1386145516Sdarrenr{ 1387145516Sdarrenr size_t len; 1388145516Sdarrenr 1389145516Sdarrenr if ((m0->m_flags & M_PKTHDR) != 0) { 1390145516Sdarrenr len = m0->m_pkthdr.len; 1391145516Sdarrenr } else { 1392145516Sdarrenr struct mbuf *m; 1393145516Sdarrenr 1394145516Sdarrenr for (m = m0, len = 0; m != NULL; m = m->m_next) 1395145516Sdarrenr len += m->m_len; 1396145516Sdarrenr } 1397145516Sdarrenr return len; 1398145516Sdarrenr} 1399145516Sdarrenr 1400145516Sdarrenr 1401145516Sdarrenr/* ------------------------------------------------------------------------ */ 1402145516Sdarrenr/* Function: fr_pullup */ 1403145516Sdarrenr/* Returns: NULL == pullup failed, else pointer to protocol header */ 1404145516Sdarrenr/* Parameters: m(I) - pointer to buffer where data packet starts */ 1405145516Sdarrenr/* fin(I) - pointer to packet information */ 1406145516Sdarrenr/* len(I) - number of bytes to pullup */ 1407145516Sdarrenr/* */ 1408145516Sdarrenr/* Attempt to move at least len bytes (from the start of the buffer) into a */ 1409145516Sdarrenr/* single buffer for ease of access. Operating system native functions are */ 1410145516Sdarrenr/* used to manage buffers - if necessary. If the entire packet ends up in */ 1411145516Sdarrenr/* a single buffer, set the FI_COALESCE flag even though fr_coalesce() has */ 1412145516Sdarrenr/* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */ 1413145516Sdarrenr/* and ONLY if the pullup succeeds. */ 1414145516Sdarrenr/* */ 1415145516Sdarrenr/* We assume that 'min' is a pointer to a buffer that is part of the chain */ 1416145516Sdarrenr/* of buffers that starts at *fin->fin_mp. */ 1417145516Sdarrenr/* ------------------------------------------------------------------------ */ 1418145516Sdarrenrvoid *fr_pullup(min, fin, len) 1419145516Sdarrenrmb_t *min; 1420145516Sdarrenrfr_info_t *fin; 1421145516Sdarrenrint len; 1422145516Sdarrenr{ 1423145516Sdarrenr int out = fin->fin_out, dpoff, ipoff; 1424145516Sdarrenr mb_t *m = min; 1425145516Sdarrenr char *ip; 1426145516Sdarrenr 1427145516Sdarrenr if (m == NULL) 1428145516Sdarrenr return NULL; 1429145516Sdarrenr 1430145516Sdarrenr ip = (char *)fin->fin_ip; 1431145516Sdarrenr if ((fin->fin_flx & FI_COALESCE) != 0) 1432145516Sdarrenr return ip; 1433145516Sdarrenr 1434145516Sdarrenr ipoff = fin->fin_ipoff; 1435145516Sdarrenr if (fin->fin_dp != NULL) 1436145516Sdarrenr dpoff = (char *)fin->fin_dp - (char *)ip; 1437145516Sdarrenr else 1438145516Sdarrenr dpoff = 0; 1439145516Sdarrenr 1440145516Sdarrenr if (M_LEN(m) < len) { 1441145516Sdarrenr#ifdef MHLEN 1442145516Sdarrenr /* 1443145516Sdarrenr * Assume that M_PKTHDR is set and just work with what is left 1444145516Sdarrenr * rather than check.. 1445145516Sdarrenr * Should not make any real difference, anyway. 1446145516Sdarrenr */ 1447145516Sdarrenr if (len > MHLEN) 1448145516Sdarrenr#else 1449145516Sdarrenr if (len > MLEN) 1450145516Sdarrenr#endif 1451145516Sdarrenr { 1452145516Sdarrenr#ifdef HAVE_M_PULLDOWN 1453145516Sdarrenr if (m_pulldown(m, 0, len, NULL) == NULL) 1454145516Sdarrenr m = NULL; 1455145516Sdarrenr#else 1456145516Sdarrenr FREE_MB_T(*fin->fin_mp); 1457145516Sdarrenr m = NULL; 1458145516Sdarrenr#endif 1459145516Sdarrenr } else 1460145516Sdarrenr { 1461145516Sdarrenr m = m_pullup(m, len); 1462145516Sdarrenr } 1463145516Sdarrenr *fin->fin_mp = m; 1464145516Sdarrenr if (m == NULL) { 1465172776Sdarrenr fin->fin_m = NULL; 1466145516Sdarrenr ATOMIC_INCL(frstats[out].fr_pull[1]); 1467145516Sdarrenr return NULL; 1468145516Sdarrenr } 1469172776Sdarrenr 1470172776Sdarrenr while (M_LEN(m) == 0) { 1471172776Sdarrenr m = m->m_next; 1472172776Sdarrenr } 1473172776Sdarrenr fin->fin_m = m; 1474145516Sdarrenr ip = MTOD(m, char *) + ipoff; 1475145516Sdarrenr } 1476145516Sdarrenr 1477145516Sdarrenr ATOMIC_INCL(frstats[out].fr_pull[0]); 1478145516Sdarrenr fin->fin_ip = (ip_t *)ip; 1479145516Sdarrenr if (fin->fin_dp != NULL) 1480145516Sdarrenr fin->fin_dp = (char *)fin->fin_ip + dpoff; 1481145516Sdarrenr 1482145516Sdarrenr if (len == fin->fin_plen) 1483145516Sdarrenr fin->fin_flx |= FI_COALESCE; 1484145516Sdarrenr return ip; 1485145516Sdarrenr} 1486170268Sdarrenr 1487170268Sdarrenr 1488170268Sdarrenrint ipf_inject(fin, m) 1489170268Sdarrenrfr_info_t *fin; 1490170268Sdarrenrmb_t *m; 1491170268Sdarrenr{ 1492170268Sdarrenr int error = 0; 1493170268Sdarrenr 1494170268Sdarrenr if (fin->fin_out == 0) { 1495170268Sdarrenr#if (__FreeBSD_version >= 501000) 1496170268Sdarrenr netisr_dispatch(NETISR_IP, m); 1497170268Sdarrenr#else 1498170268Sdarrenr struct ifqueue *ifq; 1499170268Sdarrenr 1500170268Sdarrenr ifq = &ipintrq; 1501170268Sdarrenr 1502170268Sdarrenr# ifdef _IF_QFULL 1503170268Sdarrenr if (_IF_QFULL(ifq)) 1504170268Sdarrenr# else 1505170268Sdarrenr if (IF_QFULL(ifq)) 1506170268Sdarrenr# endif 1507170268Sdarrenr { 1508170268Sdarrenr# ifdef _IF_DROP 1509170268Sdarrenr _IF_DROP(ifq); 1510170268Sdarrenr# else 1511170268Sdarrenr IF_DROP(ifq); 1512170268Sdarrenr# endif 1513170268Sdarrenr FREE_MB_T(m); 1514170268Sdarrenr error = ENOBUFS; 1515170268Sdarrenr } else { 1516170268Sdarrenr IF_ENQUEUE(ifq, m); 1517170268Sdarrenr } 1518170268Sdarrenr#endif 1519170268Sdarrenr } else { 1520170268Sdarrenr#if (__FreeBSD_version >= 470102) 1521170268Sdarrenr error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 1522170268Sdarrenr#else 1523170268Sdarrenr error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL); 1524170268Sdarrenr#endif 1525170268Sdarrenr } 1526170268Sdarrenr 1527170268Sdarrenr return error; 1528170268Sdarrenr} 1529172776Sdarrenr 1530172776Sdarrenrint ipf_pfil_unhook(void) { 1531172776Sdarrenr#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011) 1532172776Sdarrenr# if __FreeBSD_version >= 501108 1533172776Sdarrenr struct pfil_head *ph_inet; 1534172776Sdarrenr# ifdef USE_INET6 1535172776Sdarrenr struct pfil_head *ph_inet6; 1536172776Sdarrenr# endif 1537172776Sdarrenr# endif 1538172776Sdarrenr#endif 1539172776Sdarrenr 1540172776Sdarrenr#ifdef NETBSD_PF 1541172776Sdarrenr# if (__FreeBSD_version >= 500011) 1542172776Sdarrenr# if (__FreeBSD_version >= 501108) 1543172776Sdarrenr ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); 1544172776Sdarrenr if (ph_inet != NULL) 1545172776Sdarrenr pfil_remove_hook((void *)fr_check_wrapper, NULL, 1546172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet); 1547172776Sdarrenr# else 1548172776Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1549172776Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 1550172776Sdarrenr# endif 1551172776Sdarrenr# else 1552172776Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK); 1553172776Sdarrenr# endif 1554172776Sdarrenr# ifdef USE_INET6 1555172776Sdarrenr# if (__FreeBSD_version >= 501108) 1556172776Sdarrenr ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); 1557172776Sdarrenr if (ph_inet6 != NULL) 1558172776Sdarrenr pfil_remove_hook((void *)fr_check_wrapper6, NULL, 1559172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet6); 1560172776Sdarrenr# else 1561172776Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1562172776Sdarrenr &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 1563172776Sdarrenr# endif 1564172776Sdarrenr# endif 1565172776Sdarrenr#endif 1566172776Sdarrenr 1567172776Sdarrenr return (0); 1568172776Sdarrenr} 1569172776Sdarrenr 1570172776Sdarrenrint ipf_pfil_hook(void) { 1571172776Sdarrenr#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011) 1572172776Sdarrenr# if __FreeBSD_version >= 501108 1573172776Sdarrenr struct pfil_head *ph_inet; 1574172776Sdarrenr# ifdef USE_INET6 1575172776Sdarrenr struct pfil_head *ph_inet6; 1576172776Sdarrenr# endif 1577172776Sdarrenr# endif 1578172776Sdarrenr#endif 1579172776Sdarrenr 1580172776Sdarrenr# ifdef NETBSD_PF 1581172776Sdarrenr# if __FreeBSD_version >= 500011 1582172776Sdarrenr# if __FreeBSD_version >= 501108 1583172776Sdarrenr ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); 1584172776Sdarrenr# ifdef USE_INET6 1585172776Sdarrenr ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); 1586172776Sdarrenr# endif 1587172776Sdarrenr if (ph_inet == NULL 1588172776Sdarrenr# ifdef USE_INET6 1589172776Sdarrenr && ph_inet6 == NULL 1590172776Sdarrenr# endif 1591172776Sdarrenr ) 1592172776Sdarrenr return ENODEV; 1593172776Sdarrenr 1594172776Sdarrenr if (ph_inet != NULL) 1595172776Sdarrenr pfil_add_hook((void *)fr_check_wrapper, NULL, 1596172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet); 1597172776Sdarrenr# else 1598172776Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1599172776Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 1600172776Sdarrenr# endif 1601172776Sdarrenr# else 1602172776Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK); 1603172776Sdarrenr# endif 1604172776Sdarrenr# ifdef USE_INET6 1605172776Sdarrenr# if __FreeBSD_version >= 501108 1606172776Sdarrenr if (ph_inet6 != NULL) 1607172776Sdarrenr pfil_add_hook((void *)fr_check_wrapper6, NULL, 1608172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet6); 1609172776Sdarrenr# else 1610172776Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1611172776Sdarrenr &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 1612172776Sdarrenr# endif 1613172776Sdarrenr# endif 1614172776Sdarrenr# endif 1615172776Sdarrenr return (0); 1616172776Sdarrenr} 1617172776Sdarrenr 1618172776Sdarrenrvoid 1619172776Sdarrenripf_event_reg(void) 1620172776Sdarrenr{ 1621172776Sdarrenr#if (__FreeBSD_version >= 502103) 1622172776Sdarrenr ipf_arrivetag = EVENTHANDLER_REGISTER(ifnet_arrival_event, \ 1623172776Sdarrenr ipf_ifevent, NULL, \ 1624172776Sdarrenr EVENTHANDLER_PRI_ANY); 1625172776Sdarrenr ipf_departtag = EVENTHANDLER_REGISTER(ifnet_departure_event, \ 1626172776Sdarrenr ipf_ifevent, NULL, \ 1627172776Sdarrenr EVENTHANDLER_PRI_ANY); 1628172776Sdarrenr ipf_clonetag = EVENTHANDLER_REGISTER(if_clone_event, ipf_ifevent, \ 1629172776Sdarrenr NULL, EVENTHANDLER_PRI_ANY); 1630172776Sdarrenr#endif 1631172776Sdarrenr} 1632172776Sdarrenr 1633172776Sdarrenrvoid 1634172776Sdarrenripf_event_dereg(void) 1635172776Sdarrenr{ 1636172776Sdarrenr#if (__FreeBSD_version >= 502103) 1637172776Sdarrenr if (ipf_arrivetag != NULL) { 1638172776Sdarrenr EVENTHANDLER_DEREGISTER(ifnet_arrival_event, ipf_arrivetag); 1639172776Sdarrenr } 1640172776Sdarrenr if (ipf_departtag != NULL) { 1641172776Sdarrenr EVENTHANDLER_DEREGISTER(ifnet_departure_event, ipf_departtag); 1642172776Sdarrenr } 1643172776Sdarrenr if (ipf_clonetag != NULL) { 1644172776Sdarrenr EVENTHANDLER_DEREGISTER(if_clone_event, ipf_clonetag); 1645172776Sdarrenr } 1646172776Sdarrenr#endif 1647172776Sdarrenr} 1648