1145516Sdarrenr/* $FreeBSD$ */ 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 65181803Sbz#if __FreeBSD_version >= 800044 66195699Srwatson# include <netinet/tcp_var.h> 67181803Sbz#else 68181803Sbz#define V_path_mtu_discovery path_mtu_discovery 69181803Sbz#define V_ipforwarding ipforwarding 70181803Sbz#endif 71145516Sdarrenr 72145516Sdarrenr#include <net/if.h> 73145516Sdarrenr#if __FreeBSD_version >= 300000 74145516Sdarrenr# include <net/if_var.h> 75170268Sdarrenr# if __FreeBSD_version >= 500043 76170268Sdarrenr# include <net/netisr.h> 77170268Sdarrenr# endif 78145516Sdarrenr# if !defined(IPFILTER_LKM) 79145516Sdarrenr# include "opt_ipfilter.h" 80145516Sdarrenr# endif 81145516Sdarrenr#endif 82145516Sdarrenr#include <net/route.h> 83145516Sdarrenr#include <netinet/in.h> 84145516Sdarrenr#include <netinet/in_var.h> 85145516Sdarrenr#include <netinet/in_systm.h> 86145516Sdarrenr#include <netinet/ip.h> 87145516Sdarrenr#include <netinet/ip_var.h> 88145516Sdarrenr#include <netinet/tcp.h> 89145516Sdarrenr#if defined(__osf__) 90145516Sdarrenr# include <netinet/tcp_timer.h> 91145516Sdarrenr#endif 92145516Sdarrenr#include <netinet/udp.h> 93145516Sdarrenr#include <netinet/tcpip.h> 94145516Sdarrenr#include <netinet/ip_icmp.h> 95145516Sdarrenr#ifndef _KERNEL 96145516Sdarrenr# include "netinet/ipf.h" 97145516Sdarrenr#endif 98145516Sdarrenr#include "netinet/ip_compat.h" 99145516Sdarrenr#ifdef USE_INET6 100145516Sdarrenr# include <netinet/icmp6.h> 101145516Sdarrenr#endif 102145516Sdarrenr#include "netinet/ip_fil.h" 103145516Sdarrenr#include "netinet/ip_nat.h" 104145516Sdarrenr#include "netinet/ip_frag.h" 105145516Sdarrenr#include "netinet/ip_state.h" 106145516Sdarrenr#include "netinet/ip_proxy.h" 107145516Sdarrenr#include "netinet/ip_auth.h" 108145516Sdarrenr#ifdef IPFILTER_SYNC 109145516Sdarrenr#include "netinet/ip_sync.h" 110145516Sdarrenr#endif 111145516Sdarrenr#ifdef IPFILTER_SCAN 112145516Sdarrenr#include "netinet/ip_scan.h" 113145516Sdarrenr#endif 114145516Sdarrenr#include "netinet/ip_pool.h" 115145516Sdarrenr#if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000) 116145516Sdarrenr# include <sys/malloc.h> 117145516Sdarrenr#endif 118145516Sdarrenr#include <sys/kernel.h> 119145516Sdarrenr#ifdef CSUM_DATA_VALID 120145516Sdarrenr#include <machine/in_cksum.h> 121145516Sdarrenr#endif 122145516Sdarrenrextern int ip_optcopy __P((struct ip *, struct ip *)); 123145516Sdarrenr 124185419Szec#if (__FreeBSD_version > 460000) && (__FreeBSD_version < 800055) 125145516Sdarrenrextern int path_mtu_discovery; 126145516Sdarrenr#endif 127145516Sdarrenr 128145516Sdarrenr# ifdef IPFILTER_M_IPFILTER 129151897SrwatsonMALLOC_DEFINE(M_IPFILTER, "ipfilter", "IP Filter packet filter data structures"); 130145516Sdarrenr# endif 131145516Sdarrenr 132145516Sdarrenr 133145516Sdarrenr#if !defined(__osf__) 134145516Sdarrenrextern struct protosw inetsw[]; 135145516Sdarrenr#endif 136145516Sdarrenr 137145516Sdarrenrstatic int (*fr_savep) __P((ip_t *, int, void *, int, struct mbuf **)); 138145516Sdarrenrstatic int fr_send_ip __P((fr_info_t *, mb_t *, mb_t **)); 139145516Sdarrenr# ifdef USE_MUTEXES 140145516Sdarrenripfmutex_t ipl_mutex, ipf_authmx, ipf_rw, ipf_stinsert; 141145516Sdarrenripfmutex_t ipf_nat_new, ipf_natio, ipf_timeoutlock; 142170268Sdarrenripfrwlock_t ipf_mutex, ipf_global, ipf_ipidfrag, ipf_frcache, ipf_tokens; 143145516Sdarrenripfrwlock_t ipf_frag, ipf_state, ipf_nat, ipf_natfrag, ipf_auth; 144145516Sdarrenr# endif 145145516Sdarrenrint ipf_locks_done = 0; 146145516Sdarrenr 147145516Sdarrenr#if (__FreeBSD_version >= 300000) 148145516Sdarrenrstruct callout_handle fr_slowtimer_ch; 149145516Sdarrenr#endif 150161356Sguidostruct selinfo ipfselwait[IPL_LOGSIZE]; 151145516Sdarrenr 152145516Sdarrenr#if (__FreeBSD_version >= 500011) 153145516Sdarrenr# include <sys/conf.h> 154145516Sdarrenr# if defined(NETBSD_PF) 155145516Sdarrenr# include <net/pfil.h> 156186436Sbz# if (__FreeBSD_version < 501108) 157186436Sbz# include <netinet/ipprotosw.h> 158186436Sbz# endif 159145516Sdarrenr/* 160145516Sdarrenr * We provide the fr_checkp name just to minimize changes later. 161145516Sdarrenr */ 162145516Sdarrenrint (*fr_checkp) __P((ip_t *ip, int hlen, void *ifp, int out, mb_t **mp)); 163145516Sdarrenr# endif /* NETBSD_PF */ 164145516Sdarrenr#endif /* __FreeBSD_version >= 500011 */ 165145516Sdarrenr 166145516Sdarrenr 167153876Sguido#if (__FreeBSD_version >= 502103) 168153876Sguidostatic eventhandler_tag ipf_arrivetag, ipf_departtag, ipf_clonetag; 169153876Sguido 170153876Sguidostatic void ipf_ifevent(void *arg); 171153876Sguido 172153876Sguidostatic void ipf_ifevent(arg) 173153876Sguidovoid *arg; 174153876Sguido{ 175153876Sguido frsync(NULL); 176153876Sguido} 177153876Sguido#endif 178153876Sguido 179153876Sguido 180145516Sdarrenr#if (__FreeBSD_version >= 501108) && defined(_KERNEL) 181145516Sdarrenr 182145516Sdarrenrstatic int 183145516Sdarrenrfr_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 184145516Sdarrenr{ 185145516Sdarrenr struct ip *ip = mtod(*mp, struct ip *); 186145516Sdarrenr return fr_check(ip, ip->ip_hl << 2, ifp, (dir == PFIL_OUT), mp); 187145516Sdarrenr} 188145516Sdarrenr 189145516Sdarrenr# ifdef USE_INET6 190145516Sdarrenr# include <netinet/ip6.h> 191145516Sdarrenr 192145516Sdarrenrstatic int 193145516Sdarrenrfr_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 194145516Sdarrenr{ 195145516Sdarrenr return (fr_check(mtod(*mp, struct ip *), sizeof(struct ip6_hdr), 196145516Sdarrenr ifp, (dir == PFIL_OUT), mp)); 197145516Sdarrenr} 198145516Sdarrenr# endif 199145516Sdarrenr#endif /* __FreeBSD_version >= 501108 */ 200145516Sdarrenr#if defined(IPFILTER_LKM) 201145516Sdarrenrint iplidentify(s) 202145516Sdarrenrchar *s; 203145516Sdarrenr{ 204145516Sdarrenr if (strcmp(s, "ipl") == 0) 205145516Sdarrenr return 1; 206145516Sdarrenr return 0; 207145516Sdarrenr} 208145516Sdarrenr#endif /* IPFILTER_LKM */ 209145516Sdarrenr 210145516Sdarrenr 211170268Sdarrenrint ipfattach() 212145516Sdarrenr{ 213145516Sdarrenr#ifdef USE_SPL 214145516Sdarrenr int s; 215145516Sdarrenr#endif 216145516Sdarrenr 217145516Sdarrenr SPL_NET(s); 218145516Sdarrenr if (fr_running > 0) { 219145516Sdarrenr SPL_X(s); 220145516Sdarrenr return EBUSY; 221145516Sdarrenr } 222145516Sdarrenr 223145516Sdarrenr MUTEX_INIT(&ipf_rw, "ipf rw mutex"); 224145516Sdarrenr MUTEX_INIT(&ipf_timeoutlock, "ipf timeout queue mutex"); 225145516Sdarrenr RWLOCK_INIT(&ipf_ipidfrag, "ipf IP NAT-Frag rwlock"); 226170268Sdarrenr RWLOCK_INIT(&ipf_tokens, "ipf token rwlock"); 227145516Sdarrenr ipf_locks_done = 1; 228145516Sdarrenr 229145516Sdarrenr if (fr_initialise() < 0) { 230145516Sdarrenr SPL_X(s); 231145516Sdarrenr return EIO; 232145516Sdarrenr } 233145516Sdarrenr 234145516Sdarrenr 235145516Sdarrenr if (fr_checkp != fr_check) { 236145516Sdarrenr fr_savep = fr_checkp; 237145516Sdarrenr fr_checkp = fr_check; 238145516Sdarrenr } 239145516Sdarrenr 240161356Sguido bzero((char *)ipfselwait, sizeof(ipfselwait)); 241145516Sdarrenr bzero((char *)frcache, sizeof(frcache)); 242145516Sdarrenr fr_running = 1; 243145516Sdarrenr 244145516Sdarrenr if (fr_control_forwarding & 1) 245181803Sbz V_ipforwarding = 1; 246145516Sdarrenr 247145516Sdarrenr SPL_X(s); 248145516Sdarrenr#if (__FreeBSD_version >= 300000) 249145516Sdarrenr fr_slowtimer_ch = timeout(fr_slowtimer, NULL, 250145516Sdarrenr (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 251145516Sdarrenr#else 252145516Sdarrenr timeout(fr_slowtimer, NULL, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 253145516Sdarrenr#endif 254145516Sdarrenr return 0; 255145516Sdarrenr} 256145516Sdarrenr 257145516Sdarrenr 258145516Sdarrenr/* 259145516Sdarrenr * Disable the filter by removing the hooks from the IP input/output 260145516Sdarrenr * stream. 261145516Sdarrenr */ 262170268Sdarrenrint ipfdetach() 263145516Sdarrenr{ 264145516Sdarrenr#ifdef USE_SPL 265145516Sdarrenr int s; 266145516Sdarrenr#endif 267145516Sdarrenr if (fr_control_forwarding & 2) 268181803Sbz V_ipforwarding = 0; 269145516Sdarrenr 270145516Sdarrenr SPL_NET(s); 271145516Sdarrenr 272145516Sdarrenr#if (__FreeBSD_version >= 300000) 273145516Sdarrenr if (fr_slowtimer_ch.callout != NULL) 274145516Sdarrenr untimeout(fr_slowtimer, NULL, fr_slowtimer_ch); 275145516Sdarrenr bzero(&fr_slowtimer_ch, sizeof(fr_slowtimer_ch)); 276145516Sdarrenr#else 277145516Sdarrenr untimeout(fr_slowtimer, NULL); 278145516Sdarrenr#endif /* FreeBSD */ 279145516Sdarrenr 280145516Sdarrenr#ifndef NETBSD_PF 281145516Sdarrenr if (fr_checkp != NULL) 282145516Sdarrenr fr_checkp = fr_savep; 283145516Sdarrenr fr_savep = NULL; 284145516Sdarrenr#endif 285145516Sdarrenr 286145516Sdarrenr fr_deinitialise(); 287145516Sdarrenr 288145516Sdarrenr fr_running = -2; 289145516Sdarrenr 290145516Sdarrenr (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE); 291145516Sdarrenr (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE); 292145516Sdarrenr 293145516Sdarrenr if (ipf_locks_done == 1) { 294145516Sdarrenr MUTEX_DESTROY(&ipf_timeoutlock); 295145516Sdarrenr MUTEX_DESTROY(&ipf_rw); 296145516Sdarrenr RW_DESTROY(&ipf_ipidfrag); 297170268Sdarrenr RW_DESTROY(&ipf_tokens); 298145516Sdarrenr ipf_locks_done = 0; 299145516Sdarrenr } 300145516Sdarrenr 301145516Sdarrenr SPL_X(s); 302145516Sdarrenr 303145516Sdarrenr return 0; 304145516Sdarrenr} 305145516Sdarrenr 306145516Sdarrenr 307145516Sdarrenr/* 308145516Sdarrenr * Filter ioctl interface. 309145516Sdarrenr */ 310145516Sdarrenrint iplioctl(dev, cmd, data, mode 311145516Sdarrenr# if defined(_KERNEL) && ((BSD >= 199506) || (__FreeBSD_version >= 220000)) 312145516Sdarrenr, p) 313145516Sdarrenr# if (__FreeBSD_version >= 500024) 314145516Sdarrenrstruct thread *p; 315170268Sdarrenr# if (__FreeBSD_version >= 500043) 316192895Sjamie# define p_cred td_ucred 317170268Sdarrenr# define p_uid td_ucred->cr_ruid 318170268Sdarrenr# else 319192895Sjamie# define p_cred t_proc->p_cred 320170268Sdarrenr# define p_uid t_proc->p_cred->p_ruid 321170268Sdarrenr# endif 322145516Sdarrenr# else 323145516Sdarrenrstruct proc *p; 324170268Sdarrenr# define p_uid p_cred->p_ruid 325145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 326145516Sdarrenr# else 327145516Sdarrenr) 328145516Sdarrenr# endif 329145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 330145516Sdarrenrstruct cdev *dev; 331145516Sdarrenr#else 332145516Sdarrenrdev_t dev; 333145516Sdarrenr#endif 334145516Sdarrenrioctlcmd_t cmd; 335145516Sdarrenrcaddr_t data; 336145516Sdarrenrint mode; 337145516Sdarrenr{ 338170268Sdarrenr int error = 0, unit = 0; 339170268Sdarrenr SPL_INT(s); 340145516Sdarrenr 341145516Sdarrenr#if (BSD >= 199306) && defined(_KERNEL) 342192895Sjamie# if (__FreeBSD_version >= 500034) 343192895Sjamie if (securelevel_ge(p->p_cred, 3) && (mode & FWRITE)) 344192895Sjamie# else 345153876Sguido if ((securelevel >= 3) && (mode & FWRITE)) 346192895Sjamie# endif 347145516Sdarrenr return EPERM; 348145516Sdarrenr#endif 349145516Sdarrenr 350145516Sdarrenr unit = GET_MINOR(dev); 351145516Sdarrenr if ((IPL_LOGMAX < unit) || (unit < 0)) 352145516Sdarrenr return ENXIO; 353145516Sdarrenr 354145516Sdarrenr if (fr_running <= 0) { 355145516Sdarrenr if (unit != IPL_LOGIPF) 356145516Sdarrenr return EIO; 357145516Sdarrenr if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET && 358173181Sdarrenr cmd != SIOCIPFSET && cmd != SIOCFRENB && 359145516Sdarrenr cmd != SIOCGETFS && cmd != SIOCGETFF) 360145516Sdarrenr return EIO; 361145516Sdarrenr } 362145516Sdarrenr 363145516Sdarrenr SPL_NET(s); 364145516Sdarrenr 365170268Sdarrenr error = fr_ioctlswitch(unit, data, cmd, mode, p->p_uid, p); 366145516Sdarrenr if (error != -1) { 367145516Sdarrenr SPL_X(s); 368145516Sdarrenr return error; 369145516Sdarrenr } 370145516Sdarrenr 371145516Sdarrenr SPL_X(s); 372161356Sguido 373145516Sdarrenr return error; 374145516Sdarrenr} 375145516Sdarrenr 376145516Sdarrenr 377145516Sdarrenr#if 0 378145516Sdarrenrvoid fr_forgetifp(ifp) 379145516Sdarrenrvoid *ifp; 380145516Sdarrenr{ 381145516Sdarrenr register frentry_t *f; 382145516Sdarrenr 383145516Sdarrenr WRITE_ENTER(&ipf_mutex); 384145516Sdarrenr for (f = ipacct[0][fr_active]; (f != NULL); f = f->fr_next) 385145516Sdarrenr if (f->fr_ifa == ifp) 386145516Sdarrenr f->fr_ifa = (void *)-1; 387145516Sdarrenr for (f = ipacct[1][fr_active]; (f != NULL); f = f->fr_next) 388145516Sdarrenr if (f->fr_ifa == ifp) 389145516Sdarrenr f->fr_ifa = (void *)-1; 390145516Sdarrenr for (f = ipfilter[0][fr_active]; (f != NULL); f = f->fr_next) 391145516Sdarrenr if (f->fr_ifa == ifp) 392145516Sdarrenr f->fr_ifa = (void *)-1; 393145516Sdarrenr for (f = ipfilter[1][fr_active]; (f != NULL); f = f->fr_next) 394145516Sdarrenr if (f->fr_ifa == ifp) 395145516Sdarrenr f->fr_ifa = (void *)-1; 396145516Sdarrenr#ifdef USE_INET6 397145516Sdarrenr for (f = ipacct6[0][fr_active]; (f != NULL); f = f->fr_next) 398145516Sdarrenr if (f->fr_ifa == ifp) 399145516Sdarrenr f->fr_ifa = (void *)-1; 400145516Sdarrenr for (f = ipacct6[1][fr_active]; (f != NULL); f = f->fr_next) 401145516Sdarrenr if (f->fr_ifa == ifp) 402145516Sdarrenr f->fr_ifa = (void *)-1; 403145516Sdarrenr for (f = ipfilter6[0][fr_active]; (f != NULL); f = f->fr_next) 404145516Sdarrenr if (f->fr_ifa == ifp) 405145516Sdarrenr f->fr_ifa = (void *)-1; 406145516Sdarrenr for (f = ipfilter6[1][fr_active]; (f != NULL); f = f->fr_next) 407145516Sdarrenr if (f->fr_ifa == ifp) 408145516Sdarrenr f->fr_ifa = (void *)-1; 409145516Sdarrenr#endif 410145516Sdarrenr RWLOCK_EXIT(&ipf_mutex); 411145516Sdarrenr fr_natsync(ifp); 412145516Sdarrenr} 413145516Sdarrenr#endif 414145516Sdarrenr 415145516Sdarrenr 416145516Sdarrenr/* 417145516Sdarrenr * routines below for saving IP headers to buffer 418145516Sdarrenr */ 419145516Sdarrenrint iplopen(dev, flags 420145516Sdarrenr#if ((BSD >= 199506) || (__FreeBSD_version >= 220000)) && defined(_KERNEL) 421145516Sdarrenr, devtype, p) 422145516Sdarrenrint devtype; 423145516Sdarrenr# if (__FreeBSD_version >= 500024) 424145516Sdarrenrstruct thread *p; 425145516Sdarrenr# else 426145516Sdarrenrstruct proc *p; 427145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 428145516Sdarrenr#else 429145516Sdarrenr) 430145516Sdarrenr#endif 431145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 432145516Sdarrenrstruct cdev *dev; 433145516Sdarrenr#else 434145516Sdarrenrdev_t dev; 435145516Sdarrenr#endif 436145516Sdarrenrint flags; 437145516Sdarrenr{ 438145516Sdarrenr u_int min = GET_MINOR(dev); 439145516Sdarrenr 440145516Sdarrenr if (IPL_LOGMAX < min) 441145516Sdarrenr min = ENXIO; 442145516Sdarrenr else 443145516Sdarrenr min = 0; 444145516Sdarrenr return min; 445145516Sdarrenr} 446145516Sdarrenr 447145516Sdarrenr 448145516Sdarrenrint iplclose(dev, flags 449145516Sdarrenr#if ((BSD >= 199506) || (__FreeBSD_version >= 220000)) && defined(_KERNEL) 450145516Sdarrenr, devtype, p) 451145516Sdarrenrint devtype; 452145516Sdarrenr# if (__FreeBSD_version >= 500024) 453145516Sdarrenrstruct thread *p; 454145516Sdarrenr# else 455145516Sdarrenrstruct proc *p; 456145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 457145516Sdarrenr#else 458145516Sdarrenr) 459145516Sdarrenr#endif 460145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 461145516Sdarrenrstruct cdev *dev; 462145516Sdarrenr#else 463145516Sdarrenrdev_t dev; 464145516Sdarrenr#endif 465145516Sdarrenrint flags; 466145516Sdarrenr{ 467145516Sdarrenr u_int min = GET_MINOR(dev); 468145516Sdarrenr 469145516Sdarrenr if (IPL_LOGMAX < min) 470145516Sdarrenr min = ENXIO; 471145516Sdarrenr else 472145516Sdarrenr min = 0; 473145516Sdarrenr return min; 474145516Sdarrenr} 475145516Sdarrenr 476145516Sdarrenr/* 477145516Sdarrenr * iplread/ipllog 478145516Sdarrenr * both of these must operate with at least splnet() lest they be 479145516Sdarrenr * called during packet processing and cause an inconsistancy to appear in 480145516Sdarrenr * the filter lists. 481145516Sdarrenr */ 482145516Sdarrenr#if (BSD >= 199306) 483145516Sdarrenrint iplread(dev, uio, ioflag) 484145516Sdarrenrint ioflag; 485145516Sdarrenr#else 486145516Sdarrenrint iplread(dev, uio) 487145516Sdarrenr#endif 488145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 489145516Sdarrenrstruct cdev *dev; 490145516Sdarrenr#else 491145516Sdarrenrdev_t dev; 492145516Sdarrenr#endif 493145516Sdarrenrregister struct uio *uio; 494145516Sdarrenr{ 495161356Sguido u_int xmin = GET_MINOR(dev); 496145516Sdarrenr 497170268Sdarrenr if (fr_running < 1) 498170268Sdarrenr return EIO; 499170268Sdarrenr 500161356Sguido if (xmin < 0) 501161356Sguido return ENXIO; 502161356Sguido 503145516Sdarrenr# ifdef IPFILTER_SYNC 504161356Sguido if (xmin == IPL_LOGSYNC) 505145516Sdarrenr return ipfsync_read(uio); 506145516Sdarrenr# endif 507145516Sdarrenr 508145516Sdarrenr#ifdef IPFILTER_LOG 509161356Sguido return ipflog_read(xmin, uio); 510145516Sdarrenr#else 511145516Sdarrenr return ENXIO; 512145516Sdarrenr#endif 513145516Sdarrenr} 514145516Sdarrenr 515145516Sdarrenr 516145516Sdarrenr/* 517145516Sdarrenr * iplwrite 518145516Sdarrenr * both of these must operate with at least splnet() lest they be 519145516Sdarrenr * called during packet processing and cause an inconsistancy to appear in 520145516Sdarrenr * the filter lists. 521145516Sdarrenr */ 522145516Sdarrenr#if (BSD >= 199306) 523145516Sdarrenrint iplwrite(dev, uio, ioflag) 524145516Sdarrenrint ioflag; 525145516Sdarrenr#else 526145516Sdarrenrint iplwrite(dev, uio) 527145516Sdarrenr#endif 528145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 529145516Sdarrenrstruct cdev *dev; 530145516Sdarrenr#else 531145516Sdarrenrdev_t dev; 532145516Sdarrenr#endif 533145516Sdarrenrregister struct uio *uio; 534145516Sdarrenr{ 535145516Sdarrenr 536170268Sdarrenr if (fr_running < 1) 537170268Sdarrenr return EIO; 538170268Sdarrenr 539145516Sdarrenr#ifdef IPFILTER_SYNC 540145516Sdarrenr if (GET_MINOR(dev) == IPL_LOGSYNC) 541145516Sdarrenr return ipfsync_write(uio); 542145516Sdarrenr#endif 543145516Sdarrenr return ENXIO; 544145516Sdarrenr} 545145516Sdarrenr 546145516Sdarrenr 547145516Sdarrenr/* 548145516Sdarrenr * fr_send_reset - this could conceivably be a call to tcp_respond(), but that 549145516Sdarrenr * requires a large amount of setting up and isn't any more efficient. 550145516Sdarrenr */ 551145516Sdarrenrint fr_send_reset(fin) 552145516Sdarrenrfr_info_t *fin; 553145516Sdarrenr{ 554145516Sdarrenr struct tcphdr *tcp, *tcp2; 555145516Sdarrenr int tlen = 0, hlen; 556145516Sdarrenr struct mbuf *m; 557145516Sdarrenr#ifdef USE_INET6 558145516Sdarrenr ip6_t *ip6; 559145516Sdarrenr#endif 560145516Sdarrenr ip_t *ip; 561145516Sdarrenr 562145516Sdarrenr tcp = fin->fin_dp; 563145516Sdarrenr if (tcp->th_flags & TH_RST) 564145516Sdarrenr return -1; /* feedback loop */ 565145516Sdarrenr 566145516Sdarrenr if (fr_checkl4sum(fin) == -1) 567145516Sdarrenr return -1; 568145516Sdarrenr 569145516Sdarrenr tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) + 570145516Sdarrenr ((tcp->th_flags & TH_SYN) ? 1 : 0) + 571145516Sdarrenr ((tcp->th_flags & TH_FIN) ? 1 : 0); 572145516Sdarrenr 573145516Sdarrenr#ifdef USE_INET6 574145516Sdarrenr hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t); 575145516Sdarrenr#else 576145516Sdarrenr hlen = sizeof(ip_t); 577145516Sdarrenr#endif 578145516Sdarrenr#ifdef MGETHDR 579145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 580145516Sdarrenr#else 581145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 582145516Sdarrenr#endif 583145516Sdarrenr if (m == NULL) 584145516Sdarrenr return -1; 585145516Sdarrenr if (sizeof(*tcp2) + hlen > MLEN) { 586145516Sdarrenr MCLGET(m, M_DONTWAIT); 587145516Sdarrenr if ((m->m_flags & M_EXT) == 0) { 588145516Sdarrenr FREE_MB_T(m); 589145516Sdarrenr return -1; 590145516Sdarrenr } 591145516Sdarrenr } 592145516Sdarrenr 593145516Sdarrenr m->m_len = sizeof(*tcp2) + hlen; 594145516Sdarrenr#if (BSD >= 199103) 595145516Sdarrenr m->m_data += max_linkhdr; 596145516Sdarrenr m->m_pkthdr.len = m->m_len; 597145516Sdarrenr m->m_pkthdr.rcvif = (struct ifnet *)0; 598145516Sdarrenr#endif 599145516Sdarrenr ip = mtod(m, struct ip *); 600145516Sdarrenr bzero((char *)ip, hlen); 601145516Sdarrenr#ifdef USE_INET6 602145516Sdarrenr ip6 = (ip6_t *)ip; 603145516Sdarrenr#endif 604145516Sdarrenr tcp2 = (struct tcphdr *)((char *)ip + hlen); 605145516Sdarrenr tcp2->th_sport = tcp->th_dport; 606145516Sdarrenr tcp2->th_dport = tcp->th_sport; 607145516Sdarrenr 608145516Sdarrenr if (tcp->th_flags & TH_ACK) { 609145516Sdarrenr tcp2->th_seq = tcp->th_ack; 610145516Sdarrenr tcp2->th_flags = TH_RST; 611145516Sdarrenr tcp2->th_ack = 0; 612145516Sdarrenr } else { 613145516Sdarrenr tcp2->th_seq = 0; 614145516Sdarrenr tcp2->th_ack = ntohl(tcp->th_seq); 615145516Sdarrenr tcp2->th_ack += tlen; 616145516Sdarrenr tcp2->th_ack = htonl(tcp2->th_ack); 617145516Sdarrenr tcp2->th_flags = TH_RST|TH_ACK; 618145516Sdarrenr } 619145516Sdarrenr TCP_X2_A(tcp2, 0); 620145516Sdarrenr TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2); 621145516Sdarrenr tcp2->th_win = tcp->th_win; 622145516Sdarrenr tcp2->th_sum = 0; 623145516Sdarrenr tcp2->th_urp = 0; 624145516Sdarrenr 625145516Sdarrenr#ifdef USE_INET6 626145516Sdarrenr if (fin->fin_v == 6) { 627145516Sdarrenr ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 628145516Sdarrenr ip6->ip6_plen = htons(sizeof(struct tcphdr)); 629145516Sdarrenr ip6->ip6_nxt = IPPROTO_TCP; 630145516Sdarrenr ip6->ip6_hlim = 0; 631145516Sdarrenr ip6->ip6_src = fin->fin_dst6; 632145516Sdarrenr ip6->ip6_dst = fin->fin_src6; 633145516Sdarrenr tcp2->th_sum = in6_cksum(m, IPPROTO_TCP, 634145516Sdarrenr sizeof(*ip6), sizeof(*tcp2)); 635145516Sdarrenr return fr_send_ip(fin, m, &m); 636145516Sdarrenr } 637145516Sdarrenr#endif 638145516Sdarrenr ip->ip_p = IPPROTO_TCP; 639145516Sdarrenr ip->ip_len = htons(sizeof(struct tcphdr)); 640145516Sdarrenr ip->ip_src.s_addr = fin->fin_daddr; 641145516Sdarrenr ip->ip_dst.s_addr = fin->fin_saddr; 642145516Sdarrenr tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2)); 643145516Sdarrenr ip->ip_len = hlen + sizeof(*tcp2); 644145516Sdarrenr return fr_send_ip(fin, m, &m); 645145516Sdarrenr} 646145516Sdarrenr 647145516Sdarrenr 648145516Sdarrenrstatic int fr_send_ip(fin, m, mpp) 649145516Sdarrenrfr_info_t *fin; 650145516Sdarrenrmb_t *m, **mpp; 651145516Sdarrenr{ 652145516Sdarrenr fr_info_t fnew; 653145516Sdarrenr ip_t *ip, *oip; 654145516Sdarrenr int hlen; 655145516Sdarrenr 656145516Sdarrenr ip = mtod(m, ip_t *); 657145516Sdarrenr bzero((char *)&fnew, sizeof(fnew)); 658145516Sdarrenr 659145516Sdarrenr IP_V_A(ip, fin->fin_v); 660145516Sdarrenr switch (fin->fin_v) 661145516Sdarrenr { 662145516Sdarrenr case 4 : 663145516Sdarrenr fnew.fin_v = 4; 664145516Sdarrenr oip = fin->fin_ip; 665145516Sdarrenr IP_HL_A(ip, sizeof(*oip) >> 2); 666145516Sdarrenr ip->ip_tos = oip->ip_tos; 667145516Sdarrenr ip->ip_id = fin->fin_ip->ip_id; 668145516Sdarrenr#if (__FreeBSD_version > 460000) 669181803Sbz ip->ip_off = V_path_mtu_discovery ? IP_DF : 0; 670145516Sdarrenr#else 671145516Sdarrenr ip->ip_off = 0; 672145516Sdarrenr#endif 673181803Sbz ip->ip_ttl = V_ip_defttl; 674145516Sdarrenr ip->ip_sum = 0; 675145516Sdarrenr hlen = sizeof(*oip); 676145516Sdarrenr break; 677145516Sdarrenr#ifdef USE_INET6 678145516Sdarrenr case 6 : 679145516Sdarrenr { 680145516Sdarrenr ip6_t *ip6 = (ip6_t *)ip; 681145516Sdarrenr 682145516Sdarrenr ip6->ip6_vfc = 0x60; 683145516Sdarrenr ip6->ip6_hlim = IPDEFTTL; 684145516Sdarrenr 685145516Sdarrenr fnew.fin_v = 6; 686145516Sdarrenr hlen = sizeof(*ip6); 687145516Sdarrenr break; 688145516Sdarrenr } 689145516Sdarrenr#endif 690145516Sdarrenr default : 691145516Sdarrenr return EINVAL; 692145516Sdarrenr } 693145516Sdarrenr#ifdef IPSEC 694145516Sdarrenr m->m_pkthdr.rcvif = NULL; 695145516Sdarrenr#endif 696145516Sdarrenr 697145516Sdarrenr fnew.fin_ifp = fin->fin_ifp; 698145516Sdarrenr fnew.fin_flx = FI_NOCKSUM; 699145516Sdarrenr fnew.fin_m = m; 700145516Sdarrenr fnew.fin_ip = ip; 701145516Sdarrenr fnew.fin_mp = mpp; 702145516Sdarrenr fnew.fin_hlen = hlen; 703145516Sdarrenr fnew.fin_dp = (char *)ip + hlen; 704145516Sdarrenr (void) fr_makefrip(hlen, ip, &fnew); 705145516Sdarrenr 706145516Sdarrenr return fr_fastroute(m, mpp, &fnew, NULL); 707145516Sdarrenr} 708145516Sdarrenr 709145516Sdarrenr 710145516Sdarrenrint fr_send_icmp_err(type, fin, dst) 711145516Sdarrenrint type; 712145516Sdarrenrfr_info_t *fin; 713145516Sdarrenrint dst; 714145516Sdarrenr{ 715145516Sdarrenr int err, hlen, xtra, iclen, ohlen, avail, code; 716145516Sdarrenr struct in_addr dst4; 717145516Sdarrenr struct icmp *icmp; 718145516Sdarrenr struct mbuf *m; 719145516Sdarrenr void *ifp; 720145516Sdarrenr#ifdef USE_INET6 721145516Sdarrenr ip6_t *ip6; 722145516Sdarrenr struct in6_addr dst6; 723145516Sdarrenr#endif 724145516Sdarrenr ip_t *ip, *ip2; 725145516Sdarrenr 726172776Sdarrenr if ((type < 0) || (type >= ICMP_MAXTYPE)) 727145516Sdarrenr return -1; 728145516Sdarrenr 729145516Sdarrenr code = fin->fin_icode; 730145516Sdarrenr#ifdef USE_INET6 731145516Sdarrenr if ((code < 0) || (code > sizeof(icmptoicmp6unreach)/sizeof(int))) 732145516Sdarrenr return -1; 733145516Sdarrenr#endif 734145516Sdarrenr 735145516Sdarrenr if (fr_checkl4sum(fin) == -1) 736145516Sdarrenr return -1; 737145516Sdarrenr#ifdef MGETHDR 738145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 739145516Sdarrenr#else 740145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 741145516Sdarrenr#endif 742145516Sdarrenr if (m == NULL) 743145516Sdarrenr return -1; 744145516Sdarrenr avail = MHLEN; 745145516Sdarrenr 746145516Sdarrenr xtra = 0; 747145516Sdarrenr hlen = 0; 748145516Sdarrenr ohlen = 0; 749145516Sdarrenr ifp = fin->fin_ifp; 750145516Sdarrenr if (fin->fin_v == 4) { 751145516Sdarrenr if ((fin->fin_p == IPPROTO_ICMP) && 752145516Sdarrenr !(fin->fin_flx & FI_SHORT)) 753145516Sdarrenr switch (ntohs(fin->fin_data[0]) >> 8) 754145516Sdarrenr { 755145516Sdarrenr case ICMP_ECHO : 756145516Sdarrenr case ICMP_TSTAMP : 757145516Sdarrenr case ICMP_IREQ : 758145516Sdarrenr case ICMP_MASKREQ : 759145516Sdarrenr break; 760145516Sdarrenr default : 761145516Sdarrenr FREE_MB_T(m); 762145516Sdarrenr return 0; 763145516Sdarrenr } 764145516Sdarrenr 765145516Sdarrenr if (dst == 0) { 766145516Sdarrenr if (fr_ifpaddr(4, FRI_NORMAL, ifp, 767145516Sdarrenr &dst4, NULL) == -1) { 768145516Sdarrenr FREE_MB_T(m); 769145516Sdarrenr return -1; 770145516Sdarrenr } 771145516Sdarrenr } else 772145516Sdarrenr dst4.s_addr = fin->fin_daddr; 773145516Sdarrenr 774145516Sdarrenr hlen = sizeof(ip_t); 775145516Sdarrenr ohlen = fin->fin_hlen; 776145516Sdarrenr if (fin->fin_hlen < fin->fin_plen) 777145516Sdarrenr xtra = MIN(fin->fin_dlen, 8); 778145516Sdarrenr else 779145516Sdarrenr xtra = 0; 780145516Sdarrenr } 781145516Sdarrenr 782145516Sdarrenr#ifdef USE_INET6 783145516Sdarrenr else if (fin->fin_v == 6) { 784145516Sdarrenr hlen = sizeof(ip6_t); 785145516Sdarrenr ohlen = sizeof(ip6_t); 786145516Sdarrenr type = icmptoicmp6types[type]; 787145516Sdarrenr if (type == ICMP6_DST_UNREACH) 788145516Sdarrenr code = icmptoicmp6unreach[code]; 789145516Sdarrenr 790145516Sdarrenr if (hlen + sizeof(*icmp) + max_linkhdr + 791145516Sdarrenr fin->fin_plen > avail) { 792145516Sdarrenr MCLGET(m, M_DONTWAIT); 793145516Sdarrenr if ((m->m_flags & M_EXT) == 0) { 794145516Sdarrenr FREE_MB_T(m); 795145516Sdarrenr return -1; 796145516Sdarrenr } 797145516Sdarrenr avail = MCLBYTES; 798145516Sdarrenr } 799145516Sdarrenr xtra = MIN(fin->fin_plen, 800145516Sdarrenr avail - hlen - sizeof(*icmp) - max_linkhdr); 801145516Sdarrenr if (dst == 0) { 802145516Sdarrenr if (fr_ifpaddr(6, FRI_NORMAL, ifp, 803145516Sdarrenr (struct in_addr *)&dst6, NULL) == -1) { 804145516Sdarrenr FREE_MB_T(m); 805145516Sdarrenr return -1; 806145516Sdarrenr } 807145516Sdarrenr } else 808145516Sdarrenr dst6 = fin->fin_dst6; 809145516Sdarrenr } 810145516Sdarrenr#endif 811145516Sdarrenr else { 812145516Sdarrenr FREE_MB_T(m); 813145516Sdarrenr return -1; 814145516Sdarrenr } 815145516Sdarrenr 816145516Sdarrenr iclen = hlen + sizeof(*icmp); 817145516Sdarrenr avail -= (max_linkhdr + iclen); 818145516Sdarrenr if (avail < 0) { 819145516Sdarrenr FREE_MB_T(m); 820145516Sdarrenr return -1; 821145516Sdarrenr } 822145516Sdarrenr if (xtra > avail) 823145516Sdarrenr xtra = avail; 824145516Sdarrenr iclen += xtra; 825145516Sdarrenr m->m_data += max_linkhdr; 826145516Sdarrenr m->m_pkthdr.rcvif = (struct ifnet *)0; 827145516Sdarrenr m->m_pkthdr.len = iclen; 828145516Sdarrenr m->m_len = iclen; 829145516Sdarrenr ip = mtod(m, ip_t *); 830145516Sdarrenr icmp = (struct icmp *)((char *)ip + hlen); 831145516Sdarrenr ip2 = (ip_t *)&icmp->icmp_ip; 832145516Sdarrenr 833145516Sdarrenr icmp->icmp_type = type; 834145516Sdarrenr icmp->icmp_code = fin->fin_icode; 835145516Sdarrenr icmp->icmp_cksum = 0; 836145516Sdarrenr#ifdef icmp_nextmtu 837145516Sdarrenr if (type == ICMP_UNREACH && 838145516Sdarrenr fin->fin_icode == ICMP_UNREACH_NEEDFRAG && ifp) 839145516Sdarrenr icmp->icmp_nextmtu = htons(((struct ifnet *)ifp)->if_mtu); 840145516Sdarrenr#endif 841145516Sdarrenr 842145516Sdarrenr bcopy((char *)fin->fin_ip, (char *)ip2, ohlen); 843145516Sdarrenr 844145516Sdarrenr#ifdef USE_INET6 845145516Sdarrenr ip6 = (ip6_t *)ip; 846145516Sdarrenr if (fin->fin_v == 6) { 847145516Sdarrenr ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 848145516Sdarrenr ip6->ip6_plen = htons(iclen - hlen); 849145516Sdarrenr ip6->ip6_nxt = IPPROTO_ICMPV6; 850145516Sdarrenr ip6->ip6_hlim = 0; 851145516Sdarrenr ip6->ip6_src = dst6; 852145516Sdarrenr ip6->ip6_dst = fin->fin_src6; 853145516Sdarrenr if (xtra > 0) 854145516Sdarrenr bcopy((char *)fin->fin_ip + ohlen, 855145516Sdarrenr (char *)&icmp->icmp_ip + ohlen, xtra); 856145516Sdarrenr icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6, 857145516Sdarrenr sizeof(*ip6), iclen - hlen); 858145516Sdarrenr } else 859145516Sdarrenr#endif 860145516Sdarrenr { 861145516Sdarrenr ip2->ip_len = htons(ip2->ip_len); 862145516Sdarrenr ip2->ip_off = htons(ip2->ip_off); 863145516Sdarrenr ip->ip_p = IPPROTO_ICMP; 864145516Sdarrenr ip->ip_src.s_addr = dst4.s_addr; 865145516Sdarrenr ip->ip_dst.s_addr = fin->fin_saddr; 866145516Sdarrenr 867145516Sdarrenr if (xtra > 0) 868145516Sdarrenr bcopy((char *)fin->fin_ip + ohlen, 869145516Sdarrenr (char *)&icmp->icmp_ip + ohlen, xtra); 870145516Sdarrenr icmp->icmp_cksum = ipf_cksum((u_short *)icmp, 871145516Sdarrenr sizeof(*icmp) + 8); 872145516Sdarrenr ip->ip_len = iclen; 873145516Sdarrenr ip->ip_p = IPPROTO_ICMP; 874145516Sdarrenr } 875145516Sdarrenr err = fr_send_ip(fin, m, &m); 876145516Sdarrenr return err; 877145516Sdarrenr} 878145516Sdarrenr 879145516Sdarrenr 880145516Sdarrenr#if !defined(IPFILTER_LKM) && (__FreeBSD_version < 300000) 881145516Sdarrenr# if (BSD < 199306) 882145516Sdarrenrint iplinit __P((void)); 883145516Sdarrenr 884145516Sdarrenrint 885145516Sdarrenr# else 886145516Sdarrenrvoid iplinit __P((void)); 887145516Sdarrenr 888145516Sdarrenrvoid 889145516Sdarrenr# endif 890145516Sdarrenriplinit() 891145516Sdarrenr{ 892170268Sdarrenr if (ipfattach() != 0) 893145516Sdarrenr printf("IP Filter failed to attach\n"); 894145516Sdarrenr ip_init(); 895145516Sdarrenr} 896145516Sdarrenr#endif /* __FreeBSD_version < 300000 */ 897145516Sdarrenr 898145516Sdarrenr 899173181Sdarrenr/* 900173181Sdarrenr * m0 - pointer to mbuf where the IP packet starts 901173181Sdarrenr * mpp - pointer to the mbuf pointer that is the start of the mbuf chain 902173181Sdarrenr */ 903145516Sdarrenrint fr_fastroute(m0, mpp, fin, fdp) 904145516Sdarrenrmb_t *m0, **mpp; 905145516Sdarrenrfr_info_t *fin; 906145516Sdarrenrfrdest_t *fdp; 907145516Sdarrenr{ 908145516Sdarrenr register struct ip *ip, *mhip; 909173181Sdarrenr register struct mbuf *m = *mpp; 910145516Sdarrenr register struct route *ro; 911145516Sdarrenr int len, off, error = 0, hlen, code; 912145516Sdarrenr struct ifnet *ifp, *sifp; 913145516Sdarrenr struct sockaddr_in *dst; 914145516Sdarrenr struct route iproute; 915145516Sdarrenr u_short ip_off; 916145516Sdarrenr frentry_t *fr; 917145516Sdarrenr 918161356Sguido ro = NULL; 919161356Sguido 920145516Sdarrenr#ifdef M_WRITABLE 921145516Sdarrenr /* 922145516Sdarrenr * HOT FIX/KLUDGE: 923145516Sdarrenr * 924145516Sdarrenr * If the mbuf we're about to send is not writable (because of 925145516Sdarrenr * a cluster reference, for example) we'll need to make a copy 926145516Sdarrenr * of it since this routine modifies the contents. 927145516Sdarrenr * 928145516Sdarrenr * If you have non-crappy network hardware that can transmit data 929145516Sdarrenr * from the mbuf, rather than making a copy, this is gonna be a 930145516Sdarrenr * problem. 931145516Sdarrenr */ 932145516Sdarrenr if (M_WRITABLE(m) == 0) { 933161356Sguido m0 = m_dup(m, M_DONTWAIT); 934161356Sguido if (m0 != 0) { 935145516Sdarrenr FREE_MB_T(m); 936145516Sdarrenr m = m0; 937145516Sdarrenr *mpp = m; 938145516Sdarrenr } else { 939145516Sdarrenr error = ENOBUFS; 940145516Sdarrenr FREE_MB_T(m); 941161356Sguido goto done; 942145516Sdarrenr } 943145516Sdarrenr } 944145516Sdarrenr#endif 945145516Sdarrenr 946145516Sdarrenr#ifdef USE_INET6 947145516Sdarrenr if (fin->fin_v == 6) { 948145516Sdarrenr /* 949145516Sdarrenr * currently "to <if>" and "to <if>:ip#" are not supported 950145516Sdarrenr * for IPv6 951145516Sdarrenr */ 952145516Sdarrenr#if (__FreeBSD_version >= 490000) 953145516Sdarrenr return ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 954145516Sdarrenr#else 955145516Sdarrenr return ip6_output(m0, NULL, NULL, 0, NULL, NULL); 956145516Sdarrenr#endif 957145516Sdarrenr } 958145516Sdarrenr#endif 959145516Sdarrenr 960145516Sdarrenr hlen = fin->fin_hlen; 961145516Sdarrenr ip = mtod(m0, struct ip *); 962145516Sdarrenr 963145516Sdarrenr /* 964145516Sdarrenr * Route packet. 965145516Sdarrenr */ 966145516Sdarrenr ro = &iproute; 967145516Sdarrenr bzero((caddr_t)ro, sizeof (*ro)); 968145516Sdarrenr dst = (struct sockaddr_in *)&ro->ro_dst; 969145516Sdarrenr dst->sin_family = AF_INET; 970145516Sdarrenr dst->sin_addr = ip->ip_dst; 971145516Sdarrenr 972145516Sdarrenr fr = fin->fin_fr; 973145516Sdarrenr if (fdp != NULL) 974145516Sdarrenr ifp = fdp->fd_ifp; 975145516Sdarrenr else 976145516Sdarrenr ifp = fin->fin_ifp; 977145516Sdarrenr 978145516Sdarrenr if ((ifp == NULL) && (!fr || !(fr->fr_flags & FR_FASTROUTE))) { 979145516Sdarrenr error = -2; 980145516Sdarrenr goto bad; 981145516Sdarrenr } 982145516Sdarrenr 983161356Sguido if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 984161356Sguido dst->sin_addr = fdp->fd_ip; 985145516Sdarrenr 986145516Sdarrenr dst->sin_len = sizeof(*dst); 987178888Sjulian in_rtalloc(ro, 0); 988145516Sdarrenr 989145516Sdarrenr if ((ifp == NULL) && (ro->ro_rt != NULL)) 990145516Sdarrenr ifp = ro->ro_rt->rt_ifp; 991145516Sdarrenr 992145516Sdarrenr if ((ro->ro_rt == NULL) || (ifp == NULL)) { 993145516Sdarrenr if (in_localaddr(ip->ip_dst)) 994145516Sdarrenr error = EHOSTUNREACH; 995145516Sdarrenr else 996145516Sdarrenr error = ENETUNREACH; 997145516Sdarrenr goto bad; 998145516Sdarrenr } 999145516Sdarrenr if (ro->ro_rt->rt_flags & RTF_GATEWAY) 1000145516Sdarrenr dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; 1001145516Sdarrenr if (ro->ro_rt) 1002145516Sdarrenr ro->ro_rt->rt_use++; 1003145516Sdarrenr 1004145516Sdarrenr /* 1005145516Sdarrenr * For input packets which are being "fastrouted", they won't 1006145516Sdarrenr * go back through output filtering and miss their chance to get 1007170268Sdarrenr * NAT'd and counted. Duplicated packets aren't considered to be 1008170268Sdarrenr * part of the normal packet stream, so do not NAT them or pass 1009170268Sdarrenr * them through stateful checking, etc. 1010145516Sdarrenr */ 1011170268Sdarrenr if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) { 1012145516Sdarrenr sifp = fin->fin_ifp; 1013145516Sdarrenr fin->fin_ifp = ifp; 1014145516Sdarrenr fin->fin_out = 1; 1015145516Sdarrenr (void) fr_acctpkt(fin, NULL); 1016145516Sdarrenr fin->fin_fr = NULL; 1017145516Sdarrenr if (!fr || !(fr->fr_flags & FR_RETMASK)) { 1018145516Sdarrenr u_32_t pass; 1019145516Sdarrenr 1020170268Sdarrenr if (fr_checkstate(fin, &pass) != NULL) 1021170268Sdarrenr fr_statederef((ipstate_t **)&fin->fin_state); 1022145516Sdarrenr } 1023145516Sdarrenr 1024145516Sdarrenr switch (fr_checknatout(fin, NULL)) 1025145516Sdarrenr { 1026145516Sdarrenr case 0 : 1027145516Sdarrenr break; 1028145516Sdarrenr case 1 : 1029170268Sdarrenr fr_natderef((nat_t **)&fin->fin_nat); 1030145516Sdarrenr ip->ip_sum = 0; 1031145516Sdarrenr break; 1032145516Sdarrenr case -1 : 1033145516Sdarrenr error = -1; 1034173181Sdarrenr goto bad; 1035145516Sdarrenr break; 1036145516Sdarrenr } 1037145516Sdarrenr 1038145516Sdarrenr fin->fin_ifp = sifp; 1039145516Sdarrenr fin->fin_out = 0; 1040145516Sdarrenr } else 1041145516Sdarrenr ip->ip_sum = 0; 1042145516Sdarrenr /* 1043145516Sdarrenr * If small enough for interface, can just send directly. 1044145516Sdarrenr */ 1045145516Sdarrenr if (ip->ip_len <= ifp->if_mtu) { 1046145516Sdarrenr ip->ip_len = htons(ip->ip_len); 1047145516Sdarrenr ip->ip_off = htons(ip->ip_off); 1048145516Sdarrenr 1049145516Sdarrenr if (!ip->ip_sum) 1050145516Sdarrenr ip->ip_sum = in_cksum(m, hlen); 1051145516Sdarrenr error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, 1052191148Skmacy ro); 1053145516Sdarrenr goto done; 1054145516Sdarrenr } 1055145516Sdarrenr /* 1056145516Sdarrenr * Too large for interface; fragment if possible. 1057145516Sdarrenr * Must be able to put at least 8 bytes per fragment. 1058145516Sdarrenr */ 1059145516Sdarrenr ip_off = ntohs(ip->ip_off); 1060145516Sdarrenr if (ip_off & IP_DF) { 1061145516Sdarrenr error = EMSGSIZE; 1062145516Sdarrenr goto bad; 1063145516Sdarrenr } 1064145516Sdarrenr len = (ifp->if_mtu - hlen) &~ 7; 1065145516Sdarrenr if (len < 8) { 1066145516Sdarrenr error = EMSGSIZE; 1067145516Sdarrenr goto bad; 1068145516Sdarrenr } 1069145516Sdarrenr 1070145516Sdarrenr { 1071145516Sdarrenr int mhlen, firstlen = len; 1072145516Sdarrenr struct mbuf **mnext = &m->m_act; 1073145516Sdarrenr 1074145516Sdarrenr /* 1075145516Sdarrenr * Loop through length of segment after first fragment, 1076145516Sdarrenr * make new header and copy data of each part and link onto chain. 1077145516Sdarrenr */ 1078145516Sdarrenr m0 = m; 1079145516Sdarrenr mhlen = sizeof (struct ip); 1080145516Sdarrenr for (off = hlen + len; off < ip->ip_len; off += len) { 1081145516Sdarrenr#ifdef MGETHDR 1082145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 1083145516Sdarrenr#else 1084145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 1085145516Sdarrenr#endif 1086145516Sdarrenr if (m == 0) { 1087145516Sdarrenr m = m0; 1088145516Sdarrenr error = ENOBUFS; 1089145516Sdarrenr goto bad; 1090145516Sdarrenr } 1091145516Sdarrenr m->m_data += max_linkhdr; 1092145516Sdarrenr mhip = mtod(m, struct ip *); 1093145516Sdarrenr bcopy((char *)ip, (char *)mhip, sizeof(*ip)); 1094145516Sdarrenr if (hlen > sizeof (struct ip)) { 1095145516Sdarrenr mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 1096145516Sdarrenr IP_HL_A(mhip, mhlen >> 2); 1097145516Sdarrenr } 1098145516Sdarrenr m->m_len = mhlen; 1099145516Sdarrenr mhip->ip_off = ((off - hlen) >> 3) + ip_off; 1100145516Sdarrenr if (off + len >= ip->ip_len) 1101145516Sdarrenr len = ip->ip_len - off; 1102145516Sdarrenr else 1103145516Sdarrenr mhip->ip_off |= IP_MF; 1104145516Sdarrenr mhip->ip_len = htons((u_short)(len + mhlen)); 1105161356Sguido *mnext = m; 1106145516Sdarrenr m->m_next = m_copy(m0, off, len); 1107145516Sdarrenr if (m->m_next == 0) { 1108145516Sdarrenr error = ENOBUFS; /* ??? */ 1109145516Sdarrenr goto sendorfree; 1110145516Sdarrenr } 1111145516Sdarrenr m->m_pkthdr.len = mhlen + len; 1112145516Sdarrenr m->m_pkthdr.rcvif = NULL; 1113145516Sdarrenr mhip->ip_off = htons((u_short)mhip->ip_off); 1114145516Sdarrenr mhip->ip_sum = 0; 1115145516Sdarrenr mhip->ip_sum = in_cksum(m, mhlen); 1116145516Sdarrenr mnext = &m->m_act; 1117145516Sdarrenr } 1118145516Sdarrenr /* 1119145516Sdarrenr * Update first fragment by trimming what's been copied out 1120145516Sdarrenr * and updating header, then send each fragment (in order). 1121145516Sdarrenr */ 1122145516Sdarrenr m_adj(m0, hlen + firstlen - ip->ip_len); 1123145516Sdarrenr ip->ip_len = htons((u_short)(hlen + firstlen)); 1124145516Sdarrenr ip->ip_off = htons((u_short)IP_MF); 1125145516Sdarrenr ip->ip_sum = 0; 1126145516Sdarrenr ip->ip_sum = in_cksum(m0, hlen); 1127145516Sdarrenrsendorfree: 1128145516Sdarrenr for (m = m0; m; m = m0) { 1129145516Sdarrenr m0 = m->m_act; 1130145516Sdarrenr m->m_act = 0; 1131145516Sdarrenr if (error == 0) 1132145516Sdarrenr error = (*ifp->if_output)(ifp, m, 1133191148Skmacy (struct sockaddr *)dst, ro); 1134145516Sdarrenr else 1135145516Sdarrenr FREE_MB_T(m); 1136145516Sdarrenr } 1137145516Sdarrenr } 1138145516Sdarrenrdone: 1139145516Sdarrenr if (!error) 1140145516Sdarrenr fr_frouteok[0]++; 1141145516Sdarrenr else 1142145516Sdarrenr fr_frouteok[1]++; 1143145516Sdarrenr 1144161356Sguido if ((ro != NULL) && (ro->ro_rt != NULL)) { 1145145516Sdarrenr RTFREE(ro->ro_rt); 1146145516Sdarrenr } 1147145516Sdarrenr *mpp = NULL; 1148145516Sdarrenr return 0; 1149145516Sdarrenrbad: 1150145516Sdarrenr if (error == EMSGSIZE) { 1151145516Sdarrenr sifp = fin->fin_ifp; 1152145516Sdarrenr code = fin->fin_icode; 1153145516Sdarrenr fin->fin_icode = ICMP_UNREACH_NEEDFRAG; 1154145516Sdarrenr fin->fin_ifp = ifp; 1155145516Sdarrenr (void) fr_send_icmp_err(ICMP_UNREACH, fin, 1); 1156145516Sdarrenr fin->fin_ifp = sifp; 1157145516Sdarrenr fin->fin_icode = code; 1158145516Sdarrenr } 1159145516Sdarrenr FREE_MB_T(m); 1160145516Sdarrenr goto done; 1161145516Sdarrenr} 1162145516Sdarrenr 1163145516Sdarrenr 1164145516Sdarrenrint fr_verifysrc(fin) 1165145516Sdarrenrfr_info_t *fin; 1166145516Sdarrenr{ 1167145516Sdarrenr struct sockaddr_in *dst; 1168145516Sdarrenr struct route iproute; 1169145516Sdarrenr 1170145516Sdarrenr bzero((char *)&iproute, sizeof(iproute)); 1171145516Sdarrenr dst = (struct sockaddr_in *)&iproute.ro_dst; 1172145516Sdarrenr dst->sin_len = sizeof(*dst); 1173145516Sdarrenr dst->sin_family = AF_INET; 1174145516Sdarrenr dst->sin_addr = fin->fin_src; 1175178888Sjulian in_rtalloc(&iproute, 0); 1176145516Sdarrenr if (iproute.ro_rt == NULL) 1177145516Sdarrenr return 0; 1178145516Sdarrenr return (fin->fin_ifp == iproute.ro_rt->rt_ifp); 1179145516Sdarrenr} 1180145516Sdarrenr 1181145516Sdarrenr 1182145516Sdarrenr/* 1183145516Sdarrenr * return the first IP Address associated with an interface 1184145516Sdarrenr */ 1185145516Sdarrenrint fr_ifpaddr(v, atype, ifptr, inp, inpmask) 1186145516Sdarrenrint v, atype; 1187145516Sdarrenrvoid *ifptr; 1188145516Sdarrenrstruct in_addr *inp, *inpmask; 1189145516Sdarrenr{ 1190145516Sdarrenr#ifdef USE_INET6 1191145516Sdarrenr struct in6_addr *inp6 = NULL; 1192145516Sdarrenr#endif 1193145516Sdarrenr struct sockaddr *sock, *mask; 1194145516Sdarrenr struct sockaddr_in *sin; 1195145516Sdarrenr struct ifaddr *ifa; 1196145516Sdarrenr struct ifnet *ifp; 1197145516Sdarrenr 1198145516Sdarrenr if ((ifptr == NULL) || (ifptr == (void *)-1)) 1199145516Sdarrenr return -1; 1200145516Sdarrenr 1201145516Sdarrenr sin = NULL; 1202145516Sdarrenr ifp = ifptr; 1203145516Sdarrenr 1204145516Sdarrenr if (v == 4) 1205145516Sdarrenr inp->s_addr = 0; 1206145516Sdarrenr#ifdef USE_INET6 1207145516Sdarrenr else if (v == 6) 1208145516Sdarrenr bzero((char *)inp, sizeof(struct in6_addr)); 1209145516Sdarrenr#endif 1210145516Sdarrenr#if (__FreeBSD_version >= 300000) 1211145516Sdarrenr ifa = TAILQ_FIRST(&ifp->if_addrhead); 1212145516Sdarrenr#else 1213145516Sdarrenr ifa = ifp->if_addrlist; 1214145516Sdarrenr#endif /* __FreeBSD_version >= 300000 */ 1215145516Sdarrenr 1216145516Sdarrenr sock = ifa->ifa_addr; 1217145516Sdarrenr while (sock != NULL && ifa != NULL) { 1218145516Sdarrenr sin = (struct sockaddr_in *)sock; 1219145516Sdarrenr if ((v == 4) && (sin->sin_family == AF_INET)) 1220145516Sdarrenr break; 1221145516Sdarrenr#ifdef USE_INET6 1222145516Sdarrenr if ((v == 6) && (sin->sin_family == AF_INET6)) { 1223145516Sdarrenr inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; 1224145516Sdarrenr if (!IN6_IS_ADDR_LINKLOCAL(inp6) && 1225145516Sdarrenr !IN6_IS_ADDR_LOOPBACK(inp6)) 1226145516Sdarrenr break; 1227145516Sdarrenr } 1228145516Sdarrenr#endif 1229145516Sdarrenr#if (__FreeBSD_version >= 300000) 1230145516Sdarrenr ifa = TAILQ_NEXT(ifa, ifa_link); 1231145516Sdarrenr#else 1232145516Sdarrenr ifa = ifa->ifa_next; 1233145516Sdarrenr#endif /* __FreeBSD_version >= 300000 */ 1234145516Sdarrenr if (ifa != NULL) 1235145516Sdarrenr sock = ifa->ifa_addr; 1236145516Sdarrenr } 1237145516Sdarrenr 1238145516Sdarrenr if (ifa == NULL || sin == NULL) 1239145516Sdarrenr return -1; 1240145516Sdarrenr 1241145516Sdarrenr mask = ifa->ifa_netmask; 1242145516Sdarrenr if (atype == FRI_BROADCAST) 1243145516Sdarrenr sock = ifa->ifa_broadaddr; 1244145516Sdarrenr else if (atype == FRI_PEERADDR) 1245145516Sdarrenr sock = ifa->ifa_dstaddr; 1246145516Sdarrenr 1247161356Sguido if (sock == NULL) 1248161356Sguido return -1; 1249161356Sguido 1250145516Sdarrenr#ifdef USE_INET6 1251145516Sdarrenr if (v == 6) { 1252145516Sdarrenr return fr_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock, 1253145516Sdarrenr (struct sockaddr_in6 *)mask, 1254145516Sdarrenr inp, inpmask); 1255145516Sdarrenr } 1256145516Sdarrenr#endif 1257145516Sdarrenr return fr_ifpfillv4addr(atype, (struct sockaddr_in *)sock, 1258145516Sdarrenr (struct sockaddr_in *)mask, inp, inpmask); 1259145516Sdarrenr} 1260145516Sdarrenr 1261145516Sdarrenr 1262145516Sdarrenru_32_t fr_newisn(fin) 1263145516Sdarrenrfr_info_t *fin; 1264145516Sdarrenr{ 1265145516Sdarrenr u_32_t newiss; 1266145516Sdarrenr#if (__FreeBSD_version >= 400000) 1267145516Sdarrenr newiss = arc4random(); 1268145516Sdarrenr#else 1269145516Sdarrenr static iss_seq_off = 0; 1270145516Sdarrenr u_char hash[16]; 1271145516Sdarrenr MD5_CTX ctx; 1272145516Sdarrenr 1273145516Sdarrenr /* 1274145516Sdarrenr * Compute the base value of the ISS. It is a hash 1275145516Sdarrenr * of (saddr, sport, daddr, dport, secret). 1276145516Sdarrenr */ 1277145516Sdarrenr MD5Init(&ctx); 1278145516Sdarrenr 1279145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, 1280145516Sdarrenr sizeof(fin->fin_fi.fi_src)); 1281145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, 1282145516Sdarrenr sizeof(fin->fin_fi.fi_dst)); 1283145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); 1284145516Sdarrenr 1285145516Sdarrenr MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret)); 1286145516Sdarrenr 1287145516Sdarrenr MD5Final(hash, &ctx); 1288145516Sdarrenr 1289145516Sdarrenr memcpy(&newiss, hash, sizeof(newiss)); 1290145516Sdarrenr 1291145516Sdarrenr /* 1292145516Sdarrenr * Now increment our "timer", and add it in to 1293145516Sdarrenr * the computed value. 1294145516Sdarrenr * 1295145516Sdarrenr * XXX Use `addin'? 1296145516Sdarrenr * XXX TCP_ISSINCR too large to use? 1297145516Sdarrenr */ 1298145516Sdarrenr iss_seq_off += 0x00010000; 1299145516Sdarrenr newiss += iss_seq_off; 1300145516Sdarrenr#endif 1301145516Sdarrenr return newiss; 1302145516Sdarrenr} 1303145516Sdarrenr 1304145516Sdarrenr 1305145516Sdarrenr/* ------------------------------------------------------------------------ */ 1306145516Sdarrenr/* Function: fr_nextipid */ 1307145516Sdarrenr/* Returns: int - 0 == success, -1 == error (packet should be droppped) */ 1308145516Sdarrenr/* Parameters: fin(I) - pointer to packet information */ 1309145516Sdarrenr/* */ 1310145516Sdarrenr/* Returns the next IPv4 ID to use for this packet. */ 1311145516Sdarrenr/* ------------------------------------------------------------------------ */ 1312145516Sdarrenru_short fr_nextipid(fin) 1313145516Sdarrenrfr_info_t *fin; 1314145516Sdarrenr{ 1315145516Sdarrenr#ifndef RANDOM_IP_ID 1316145516Sdarrenr static u_short ipid = 0; 1317145516Sdarrenr u_short id; 1318145516Sdarrenr 1319145516Sdarrenr MUTEX_ENTER(&ipf_rw); 1320145516Sdarrenr id = ipid++; 1321145516Sdarrenr MUTEX_EXIT(&ipf_rw); 1322145516Sdarrenr#else 1323145516Sdarrenr u_short id; 1324145516Sdarrenr 1325145516Sdarrenr id = ip_randomid(); 1326145516Sdarrenr#endif 1327145516Sdarrenr 1328145516Sdarrenr return id; 1329145516Sdarrenr} 1330145516Sdarrenr 1331145516Sdarrenr 1332145516SdarrenrINLINE void fr_checkv4sum(fin) 1333145516Sdarrenrfr_info_t *fin; 1334145516Sdarrenr{ 1335145516Sdarrenr#ifdef CSUM_DATA_VALID 1336145516Sdarrenr int manual = 0; 1337145516Sdarrenr u_short sum; 1338145516Sdarrenr ip_t *ip; 1339145516Sdarrenr mb_t *m; 1340145516Sdarrenr 1341145516Sdarrenr if ((fin->fin_flx & FI_NOCKSUM) != 0) 1342145516Sdarrenr return; 1343145516Sdarrenr 1344172776Sdarrenr if (fin->fin_cksum != 0) 1345172776Sdarrenr return; 1346172776Sdarrenr 1347145516Sdarrenr m = fin->fin_m; 1348145516Sdarrenr if (m == NULL) { 1349145516Sdarrenr manual = 1; 1350145516Sdarrenr goto skipauto; 1351145516Sdarrenr } 1352145516Sdarrenr ip = fin->fin_ip; 1353145516Sdarrenr 1354145516Sdarrenr if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 1355145516Sdarrenr if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 1356145516Sdarrenr sum = m->m_pkthdr.csum_data; 1357145516Sdarrenr else 1358145516Sdarrenr sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, 1359145516Sdarrenr htonl(m->m_pkthdr.csum_data + 1360241192Sfjoe fin->fin_ip->ip_len - 1361241192Sfjoe (fin->fin_ip->ip_hl << 2) + 1362241192Sfjoe fin->fin_p)); 1363145516Sdarrenr sum ^= 0xffff; 1364172776Sdarrenr if (sum != 0) { 1365145516Sdarrenr fin->fin_flx |= FI_BAD; 1366172776Sdarrenr fin->fin_cksum = -1; 1367172776Sdarrenr } else { 1368172776Sdarrenr fin->fin_cksum = 1; 1369172776Sdarrenr } 1370145516Sdarrenr } else 1371145516Sdarrenr manual = 1; 1372145516Sdarrenrskipauto: 1373145516Sdarrenr# ifdef IPFILTER_CKSUM 1374145516Sdarrenr if (manual != 0) 1375145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1376145516Sdarrenr fin->fin_flx |= FI_BAD; 1377145516Sdarrenr# else 1378145516Sdarrenr ; 1379145516Sdarrenr# endif 1380145516Sdarrenr#else 1381145516Sdarrenr# ifdef IPFILTER_CKSUM 1382145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1383145516Sdarrenr fin->fin_flx |= FI_BAD; 1384145516Sdarrenr# endif 1385145516Sdarrenr#endif 1386145516Sdarrenr} 1387145516Sdarrenr 1388145516Sdarrenr 1389145516Sdarrenr#ifdef USE_INET6 1390145516SdarrenrINLINE void fr_checkv6sum(fin) 1391145516Sdarrenrfr_info_t *fin; 1392145516Sdarrenr{ 1393145516Sdarrenr# ifdef IPFILTER_CKSUM 1394145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1395145516Sdarrenr fin->fin_flx |= FI_BAD; 1396145516Sdarrenr# endif 1397145516Sdarrenr} 1398145516Sdarrenr#endif /* USE_INET6 */ 1399145516Sdarrenr 1400145516Sdarrenr 1401145516Sdarrenrsize_t mbufchainlen(m0) 1402145516Sdarrenrstruct mbuf *m0; 1403145516Sdarrenr{ 1404145516Sdarrenr size_t len; 1405145516Sdarrenr 1406145516Sdarrenr if ((m0->m_flags & M_PKTHDR) != 0) { 1407145516Sdarrenr len = m0->m_pkthdr.len; 1408145516Sdarrenr } else { 1409145516Sdarrenr struct mbuf *m; 1410145516Sdarrenr 1411145516Sdarrenr for (m = m0, len = 0; m != NULL; m = m->m_next) 1412145516Sdarrenr len += m->m_len; 1413145516Sdarrenr } 1414145516Sdarrenr return len; 1415145516Sdarrenr} 1416145516Sdarrenr 1417145516Sdarrenr 1418145516Sdarrenr/* ------------------------------------------------------------------------ */ 1419145516Sdarrenr/* Function: fr_pullup */ 1420145516Sdarrenr/* Returns: NULL == pullup failed, else pointer to protocol header */ 1421145516Sdarrenr/* Parameters: m(I) - pointer to buffer where data packet starts */ 1422145516Sdarrenr/* fin(I) - pointer to packet information */ 1423145516Sdarrenr/* len(I) - number of bytes to pullup */ 1424145516Sdarrenr/* */ 1425145516Sdarrenr/* Attempt to move at least len bytes (from the start of the buffer) into a */ 1426145516Sdarrenr/* single buffer for ease of access. Operating system native functions are */ 1427145516Sdarrenr/* used to manage buffers - if necessary. If the entire packet ends up in */ 1428145516Sdarrenr/* a single buffer, set the FI_COALESCE flag even though fr_coalesce() has */ 1429145516Sdarrenr/* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */ 1430145516Sdarrenr/* and ONLY if the pullup succeeds. */ 1431145516Sdarrenr/* */ 1432145516Sdarrenr/* We assume that 'min' is a pointer to a buffer that is part of the chain */ 1433145516Sdarrenr/* of buffers that starts at *fin->fin_mp. */ 1434145516Sdarrenr/* ------------------------------------------------------------------------ */ 1435145516Sdarrenrvoid *fr_pullup(min, fin, len) 1436145516Sdarrenrmb_t *min; 1437145516Sdarrenrfr_info_t *fin; 1438145516Sdarrenrint len; 1439145516Sdarrenr{ 1440145516Sdarrenr int out = fin->fin_out, dpoff, ipoff; 1441145516Sdarrenr mb_t *m = min; 1442145516Sdarrenr char *ip; 1443145516Sdarrenr 1444145516Sdarrenr if (m == NULL) 1445145516Sdarrenr return NULL; 1446145516Sdarrenr 1447145516Sdarrenr ip = (char *)fin->fin_ip; 1448145516Sdarrenr if ((fin->fin_flx & FI_COALESCE) != 0) 1449145516Sdarrenr return ip; 1450145516Sdarrenr 1451145516Sdarrenr ipoff = fin->fin_ipoff; 1452145516Sdarrenr if (fin->fin_dp != NULL) 1453145516Sdarrenr dpoff = (char *)fin->fin_dp - (char *)ip; 1454145516Sdarrenr else 1455145516Sdarrenr dpoff = 0; 1456145516Sdarrenr 1457145516Sdarrenr if (M_LEN(m) < len) { 1458145516Sdarrenr#ifdef MHLEN 1459145516Sdarrenr /* 1460145516Sdarrenr * Assume that M_PKTHDR is set and just work with what is left 1461145516Sdarrenr * rather than check.. 1462145516Sdarrenr * Should not make any real difference, anyway. 1463145516Sdarrenr */ 1464145516Sdarrenr if (len > MHLEN) 1465145516Sdarrenr#else 1466145516Sdarrenr if (len > MLEN) 1467145516Sdarrenr#endif 1468145516Sdarrenr { 1469145516Sdarrenr#ifdef HAVE_M_PULLDOWN 1470145516Sdarrenr if (m_pulldown(m, 0, len, NULL) == NULL) 1471145516Sdarrenr m = NULL; 1472145516Sdarrenr#else 1473145516Sdarrenr FREE_MB_T(*fin->fin_mp); 1474145516Sdarrenr m = NULL; 1475145516Sdarrenr#endif 1476145516Sdarrenr } else 1477145516Sdarrenr { 1478145516Sdarrenr m = m_pullup(m, len); 1479145516Sdarrenr } 1480145516Sdarrenr *fin->fin_mp = m; 1481145516Sdarrenr if (m == NULL) { 1482172776Sdarrenr fin->fin_m = NULL; 1483145516Sdarrenr ATOMIC_INCL(frstats[out].fr_pull[1]); 1484145516Sdarrenr return NULL; 1485145516Sdarrenr } 1486172776Sdarrenr 1487172776Sdarrenr while (M_LEN(m) == 0) { 1488172776Sdarrenr m = m->m_next; 1489172776Sdarrenr } 1490172776Sdarrenr fin->fin_m = m; 1491145516Sdarrenr ip = MTOD(m, char *) + ipoff; 1492145516Sdarrenr } 1493145516Sdarrenr 1494145516Sdarrenr ATOMIC_INCL(frstats[out].fr_pull[0]); 1495145516Sdarrenr fin->fin_ip = (ip_t *)ip; 1496145516Sdarrenr if (fin->fin_dp != NULL) 1497145516Sdarrenr fin->fin_dp = (char *)fin->fin_ip + dpoff; 1498145516Sdarrenr 1499145516Sdarrenr if (len == fin->fin_plen) 1500145516Sdarrenr fin->fin_flx |= FI_COALESCE; 1501145516Sdarrenr return ip; 1502145516Sdarrenr} 1503170268Sdarrenr 1504170268Sdarrenr 1505170268Sdarrenrint ipf_inject(fin, m) 1506170268Sdarrenrfr_info_t *fin; 1507170268Sdarrenrmb_t *m; 1508170268Sdarrenr{ 1509170268Sdarrenr int error = 0; 1510170268Sdarrenr 1511170268Sdarrenr if (fin->fin_out == 0) { 1512170268Sdarrenr#if (__FreeBSD_version >= 501000) 1513170268Sdarrenr netisr_dispatch(NETISR_IP, m); 1514170268Sdarrenr#else 1515170268Sdarrenr struct ifqueue *ifq; 1516170268Sdarrenr 1517170268Sdarrenr ifq = &ipintrq; 1518170268Sdarrenr 1519170268Sdarrenr# ifdef _IF_QFULL 1520170268Sdarrenr if (_IF_QFULL(ifq)) 1521170268Sdarrenr# else 1522170268Sdarrenr if (IF_QFULL(ifq)) 1523170268Sdarrenr# endif 1524170268Sdarrenr { 1525170268Sdarrenr# ifdef _IF_DROP 1526170268Sdarrenr _IF_DROP(ifq); 1527170268Sdarrenr# else 1528170268Sdarrenr IF_DROP(ifq); 1529170268Sdarrenr# endif 1530170268Sdarrenr FREE_MB_T(m); 1531170268Sdarrenr error = ENOBUFS; 1532170268Sdarrenr } else { 1533170268Sdarrenr IF_ENQUEUE(ifq, m); 1534170268Sdarrenr } 1535170268Sdarrenr#endif 1536170268Sdarrenr } else { 1537173931Sdarrenr fin->fin_ip->ip_len = ntohs(fin->fin_ip->ip_len); 1538173931Sdarrenr fin->fin_ip->ip_off = ntohs(fin->fin_ip->ip_off); 1539170268Sdarrenr#if (__FreeBSD_version >= 470102) 1540170268Sdarrenr error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 1541170268Sdarrenr#else 1542170268Sdarrenr error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL); 1543170268Sdarrenr#endif 1544170268Sdarrenr } 1545170268Sdarrenr 1546170268Sdarrenr return error; 1547170268Sdarrenr} 1548172776Sdarrenr 1549172776Sdarrenrint ipf_pfil_unhook(void) { 1550172776Sdarrenr#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011) 1551172776Sdarrenr# if __FreeBSD_version >= 501108 1552172776Sdarrenr struct pfil_head *ph_inet; 1553172776Sdarrenr# ifdef USE_INET6 1554172776Sdarrenr struct pfil_head *ph_inet6; 1555172776Sdarrenr# endif 1556172776Sdarrenr# endif 1557172776Sdarrenr#endif 1558172776Sdarrenr 1559172776Sdarrenr#ifdef NETBSD_PF 1560172776Sdarrenr# if (__FreeBSD_version >= 500011) 1561172776Sdarrenr# if (__FreeBSD_version >= 501108) 1562172776Sdarrenr ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); 1563172776Sdarrenr if (ph_inet != NULL) 1564172776Sdarrenr pfil_remove_hook((void *)fr_check_wrapper, NULL, 1565172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet); 1566172776Sdarrenr# else 1567172776Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1568172776Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 1569172776Sdarrenr# endif 1570172776Sdarrenr# else 1571172776Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK); 1572172776Sdarrenr# endif 1573172776Sdarrenr# ifdef USE_INET6 1574172776Sdarrenr# if (__FreeBSD_version >= 501108) 1575172776Sdarrenr ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); 1576172776Sdarrenr if (ph_inet6 != NULL) 1577172776Sdarrenr pfil_remove_hook((void *)fr_check_wrapper6, NULL, 1578172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet6); 1579172776Sdarrenr# else 1580172776Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1581172776Sdarrenr &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 1582172776Sdarrenr# endif 1583172776Sdarrenr# endif 1584172776Sdarrenr#endif 1585172776Sdarrenr 1586172776Sdarrenr return (0); 1587172776Sdarrenr} 1588172776Sdarrenr 1589172776Sdarrenrint ipf_pfil_hook(void) { 1590172776Sdarrenr#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011) 1591172776Sdarrenr# if __FreeBSD_version >= 501108 1592172776Sdarrenr struct pfil_head *ph_inet; 1593172776Sdarrenr# ifdef USE_INET6 1594172776Sdarrenr struct pfil_head *ph_inet6; 1595172776Sdarrenr# endif 1596172776Sdarrenr# endif 1597172776Sdarrenr#endif 1598172776Sdarrenr 1599172776Sdarrenr# ifdef NETBSD_PF 1600172776Sdarrenr# if __FreeBSD_version >= 500011 1601172776Sdarrenr# if __FreeBSD_version >= 501108 1602172776Sdarrenr ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); 1603172776Sdarrenr# ifdef USE_INET6 1604172776Sdarrenr ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); 1605172776Sdarrenr# endif 1606172776Sdarrenr if (ph_inet == NULL 1607172776Sdarrenr# ifdef USE_INET6 1608172776Sdarrenr && ph_inet6 == NULL 1609172776Sdarrenr# endif 1610172776Sdarrenr ) 1611172776Sdarrenr return ENODEV; 1612172776Sdarrenr 1613172776Sdarrenr if (ph_inet != NULL) 1614172776Sdarrenr pfil_add_hook((void *)fr_check_wrapper, NULL, 1615172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet); 1616172776Sdarrenr# else 1617172776Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1618172776Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 1619172776Sdarrenr# endif 1620172776Sdarrenr# else 1621172776Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK); 1622172776Sdarrenr# endif 1623172776Sdarrenr# ifdef USE_INET6 1624172776Sdarrenr# if __FreeBSD_version >= 501108 1625172776Sdarrenr if (ph_inet6 != NULL) 1626172776Sdarrenr pfil_add_hook((void *)fr_check_wrapper6, NULL, 1627172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet6); 1628172776Sdarrenr# else 1629172776Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1630172776Sdarrenr &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 1631172776Sdarrenr# endif 1632172776Sdarrenr# endif 1633172776Sdarrenr# endif 1634172776Sdarrenr return (0); 1635172776Sdarrenr} 1636172776Sdarrenr 1637172776Sdarrenrvoid 1638172776Sdarrenripf_event_reg(void) 1639172776Sdarrenr{ 1640172776Sdarrenr#if (__FreeBSD_version >= 502103) 1641172776Sdarrenr ipf_arrivetag = EVENTHANDLER_REGISTER(ifnet_arrival_event, \ 1642172776Sdarrenr ipf_ifevent, NULL, \ 1643172776Sdarrenr EVENTHANDLER_PRI_ANY); 1644172776Sdarrenr ipf_departtag = EVENTHANDLER_REGISTER(ifnet_departure_event, \ 1645172776Sdarrenr ipf_ifevent, NULL, \ 1646172776Sdarrenr EVENTHANDLER_PRI_ANY); 1647172776Sdarrenr ipf_clonetag = EVENTHANDLER_REGISTER(if_clone_event, ipf_ifevent, \ 1648172776Sdarrenr NULL, EVENTHANDLER_PRI_ANY); 1649172776Sdarrenr#endif 1650172776Sdarrenr} 1651172776Sdarrenr 1652172776Sdarrenrvoid 1653172776Sdarrenripf_event_dereg(void) 1654172776Sdarrenr{ 1655172776Sdarrenr#if (__FreeBSD_version >= 502103) 1656172776Sdarrenr if (ipf_arrivetag != NULL) { 1657172776Sdarrenr EVENTHANDLER_DEREGISTER(ifnet_arrival_event, ipf_arrivetag); 1658172776Sdarrenr } 1659172776Sdarrenr if (ipf_departtag != NULL) { 1660172776Sdarrenr EVENTHANDLER_DEREGISTER(ifnet_departure_event, ipf_departtag); 1661172776Sdarrenr } 1662172776Sdarrenr if (ipf_clonetag != NULL) { 1663172776Sdarrenr EVENTHANDLER_DEREGISTER(if_clone_event, ipf_clonetag); 1664172776Sdarrenr } 1665172776Sdarrenr#endif 1666172776Sdarrenr} 1667