ip_fil_freebsd.c revision 181803
1145516Sdarrenr/* $FreeBSD: head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c 181803 2008-08-17 23:27:27Z bz $ */ 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 66181803Sbz# include <sys/vimage.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 124145516Sdarrenr#if (__FreeBSD_version > 460000) 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> 156145516Sdarrenr# include <netinet/ipprotosw.h> 157145516Sdarrenr/* 158145516Sdarrenr * We provide the fr_checkp name just to minimize changes later. 159145516Sdarrenr */ 160145516Sdarrenrint (*fr_checkp) __P((ip_t *ip, int hlen, void *ifp, int out, mb_t **mp)); 161145516Sdarrenr# endif /* NETBSD_PF */ 162145516Sdarrenr#endif /* __FreeBSD_version >= 500011 */ 163145516Sdarrenr 164145516Sdarrenr 165153876Sguido#if (__FreeBSD_version >= 502103) 166153876Sguidostatic eventhandler_tag ipf_arrivetag, ipf_departtag, ipf_clonetag; 167153876Sguido 168153876Sguidostatic void ipf_ifevent(void *arg); 169153876Sguido 170153876Sguidostatic void ipf_ifevent(arg) 171153876Sguidovoid *arg; 172153876Sguido{ 173153876Sguido frsync(NULL); 174153876Sguido} 175153876Sguido#endif 176153876Sguido 177153876Sguido 178145516Sdarrenr#if (__FreeBSD_version >= 501108) && defined(_KERNEL) 179145516Sdarrenr 180145516Sdarrenrstatic int 181145516Sdarrenrfr_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 182145516Sdarrenr{ 183145516Sdarrenr struct ip *ip = mtod(*mp, struct ip *); 184145516Sdarrenr return fr_check(ip, ip->ip_hl << 2, ifp, (dir == PFIL_OUT), mp); 185145516Sdarrenr} 186145516Sdarrenr 187145516Sdarrenr# ifdef USE_INET6 188145516Sdarrenr# include <netinet/ip6.h> 189145516Sdarrenr 190145516Sdarrenrstatic int 191145516Sdarrenrfr_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 192145516Sdarrenr{ 193145516Sdarrenr return (fr_check(mtod(*mp, struct ip *), sizeof(struct ip6_hdr), 194145516Sdarrenr ifp, (dir == PFIL_OUT), mp)); 195145516Sdarrenr} 196145516Sdarrenr# endif 197145516Sdarrenr#endif /* __FreeBSD_version >= 501108 */ 198145516Sdarrenr#if defined(IPFILTER_LKM) 199145516Sdarrenrint iplidentify(s) 200145516Sdarrenrchar *s; 201145516Sdarrenr{ 202145516Sdarrenr if (strcmp(s, "ipl") == 0) 203145516Sdarrenr return 1; 204145516Sdarrenr return 0; 205145516Sdarrenr} 206145516Sdarrenr#endif /* IPFILTER_LKM */ 207145516Sdarrenr 208145516Sdarrenr 209170268Sdarrenrint ipfattach() 210145516Sdarrenr{ 211145516Sdarrenr#ifdef USE_SPL 212145516Sdarrenr int s; 213145516Sdarrenr#endif 214145516Sdarrenr 215145516Sdarrenr SPL_NET(s); 216145516Sdarrenr if (fr_running > 0) { 217145516Sdarrenr SPL_X(s); 218145516Sdarrenr return EBUSY; 219145516Sdarrenr } 220145516Sdarrenr 221145516Sdarrenr MUTEX_INIT(&ipf_rw, "ipf rw mutex"); 222145516Sdarrenr MUTEX_INIT(&ipf_timeoutlock, "ipf timeout queue mutex"); 223145516Sdarrenr RWLOCK_INIT(&ipf_ipidfrag, "ipf IP NAT-Frag rwlock"); 224170268Sdarrenr RWLOCK_INIT(&ipf_tokens, "ipf token rwlock"); 225145516Sdarrenr ipf_locks_done = 1; 226145516Sdarrenr 227145516Sdarrenr if (fr_initialise() < 0) { 228145516Sdarrenr SPL_X(s); 229145516Sdarrenr return EIO; 230145516Sdarrenr } 231145516Sdarrenr 232145516Sdarrenr 233145516Sdarrenr if (fr_checkp != fr_check) { 234145516Sdarrenr fr_savep = fr_checkp; 235145516Sdarrenr fr_checkp = fr_check; 236145516Sdarrenr } 237145516Sdarrenr 238161356Sguido bzero((char *)ipfselwait, sizeof(ipfselwait)); 239145516Sdarrenr bzero((char *)frcache, sizeof(frcache)); 240145516Sdarrenr fr_running = 1; 241145516Sdarrenr 242145516Sdarrenr if (fr_control_forwarding & 1) 243181803Sbz V_ipforwarding = 1; 244145516Sdarrenr 245145516Sdarrenr SPL_X(s); 246145516Sdarrenr#if (__FreeBSD_version >= 300000) 247145516Sdarrenr fr_slowtimer_ch = timeout(fr_slowtimer, NULL, 248145516Sdarrenr (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 249145516Sdarrenr#else 250145516Sdarrenr timeout(fr_slowtimer, NULL, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 251145516Sdarrenr#endif 252145516Sdarrenr return 0; 253145516Sdarrenr} 254145516Sdarrenr 255145516Sdarrenr 256145516Sdarrenr/* 257145516Sdarrenr * Disable the filter by removing the hooks from the IP input/output 258145516Sdarrenr * stream. 259145516Sdarrenr */ 260170268Sdarrenrint ipfdetach() 261145516Sdarrenr{ 262145516Sdarrenr#ifdef USE_SPL 263145516Sdarrenr int s; 264145516Sdarrenr#endif 265145516Sdarrenr if (fr_control_forwarding & 2) 266181803Sbz V_ipforwarding = 0; 267145516Sdarrenr 268145516Sdarrenr SPL_NET(s); 269145516Sdarrenr 270145516Sdarrenr#if (__FreeBSD_version >= 300000) 271145516Sdarrenr if (fr_slowtimer_ch.callout != NULL) 272145516Sdarrenr untimeout(fr_slowtimer, NULL, fr_slowtimer_ch); 273145516Sdarrenr bzero(&fr_slowtimer_ch, sizeof(fr_slowtimer_ch)); 274145516Sdarrenr#else 275145516Sdarrenr untimeout(fr_slowtimer, NULL); 276145516Sdarrenr#endif /* FreeBSD */ 277145516Sdarrenr 278145516Sdarrenr#ifndef NETBSD_PF 279145516Sdarrenr if (fr_checkp != NULL) 280145516Sdarrenr fr_checkp = fr_savep; 281145516Sdarrenr fr_savep = NULL; 282145516Sdarrenr#endif 283145516Sdarrenr 284145516Sdarrenr fr_deinitialise(); 285145516Sdarrenr 286145516Sdarrenr fr_running = -2; 287145516Sdarrenr 288145516Sdarrenr (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE); 289145516Sdarrenr (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE); 290145516Sdarrenr 291145516Sdarrenr if (ipf_locks_done == 1) { 292145516Sdarrenr MUTEX_DESTROY(&ipf_timeoutlock); 293145516Sdarrenr MUTEX_DESTROY(&ipf_rw); 294145516Sdarrenr RW_DESTROY(&ipf_ipidfrag); 295170268Sdarrenr RW_DESTROY(&ipf_tokens); 296145516Sdarrenr ipf_locks_done = 0; 297145516Sdarrenr } 298145516Sdarrenr 299145516Sdarrenr SPL_X(s); 300145516Sdarrenr 301145516Sdarrenr return 0; 302145516Sdarrenr} 303145516Sdarrenr 304145516Sdarrenr 305145516Sdarrenr/* 306145516Sdarrenr * Filter ioctl interface. 307145516Sdarrenr */ 308145516Sdarrenrint iplioctl(dev, cmd, data, mode 309145516Sdarrenr# if defined(_KERNEL) && ((BSD >= 199506) || (__FreeBSD_version >= 220000)) 310145516Sdarrenr, p) 311145516Sdarrenr# if (__FreeBSD_version >= 500024) 312145516Sdarrenrstruct thread *p; 313170268Sdarrenr# if (__FreeBSD_version >= 500043) 314170268Sdarrenr# define p_uid td_ucred->cr_ruid 315170268Sdarrenr# else 316170268Sdarrenr# define p_uid t_proc->p_cred->p_ruid 317170268Sdarrenr# endif 318145516Sdarrenr# else 319145516Sdarrenrstruct proc *p; 320170268Sdarrenr# define p_uid p_cred->p_ruid 321145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 322145516Sdarrenr# else 323145516Sdarrenr) 324145516Sdarrenr# endif 325145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 326145516Sdarrenrstruct cdev *dev; 327145516Sdarrenr#else 328145516Sdarrenrdev_t dev; 329145516Sdarrenr#endif 330145516Sdarrenrioctlcmd_t cmd; 331145516Sdarrenrcaddr_t data; 332145516Sdarrenrint mode; 333145516Sdarrenr{ 334170268Sdarrenr int error = 0, unit = 0; 335170268Sdarrenr SPL_INT(s); 336145516Sdarrenr 337145516Sdarrenr#if (BSD >= 199306) && defined(_KERNEL) 338153876Sguido if ((securelevel >= 3) && (mode & FWRITE)) 339145516Sdarrenr return EPERM; 340145516Sdarrenr#endif 341145516Sdarrenr 342145516Sdarrenr unit = GET_MINOR(dev); 343145516Sdarrenr if ((IPL_LOGMAX < unit) || (unit < 0)) 344145516Sdarrenr return ENXIO; 345145516Sdarrenr 346145516Sdarrenr if (fr_running <= 0) { 347145516Sdarrenr if (unit != IPL_LOGIPF) 348145516Sdarrenr return EIO; 349145516Sdarrenr if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET && 350173181Sdarrenr cmd != SIOCIPFSET && cmd != SIOCFRENB && 351145516Sdarrenr cmd != SIOCGETFS && cmd != SIOCGETFF) 352145516Sdarrenr return EIO; 353145516Sdarrenr } 354145516Sdarrenr 355145516Sdarrenr SPL_NET(s); 356145516Sdarrenr 357170268Sdarrenr error = fr_ioctlswitch(unit, data, cmd, mode, p->p_uid, p); 358145516Sdarrenr if (error != -1) { 359145516Sdarrenr SPL_X(s); 360145516Sdarrenr return error; 361145516Sdarrenr } 362145516Sdarrenr 363145516Sdarrenr SPL_X(s); 364161356Sguido 365145516Sdarrenr return error; 366145516Sdarrenr} 367145516Sdarrenr 368145516Sdarrenr 369145516Sdarrenr#if 0 370145516Sdarrenrvoid fr_forgetifp(ifp) 371145516Sdarrenrvoid *ifp; 372145516Sdarrenr{ 373145516Sdarrenr register frentry_t *f; 374145516Sdarrenr 375145516Sdarrenr WRITE_ENTER(&ipf_mutex); 376145516Sdarrenr for (f = ipacct[0][fr_active]; (f != NULL); f = f->fr_next) 377145516Sdarrenr if (f->fr_ifa == ifp) 378145516Sdarrenr f->fr_ifa = (void *)-1; 379145516Sdarrenr for (f = ipacct[1][fr_active]; (f != NULL); f = f->fr_next) 380145516Sdarrenr if (f->fr_ifa == ifp) 381145516Sdarrenr f->fr_ifa = (void *)-1; 382145516Sdarrenr for (f = ipfilter[0][fr_active]; (f != NULL); f = f->fr_next) 383145516Sdarrenr if (f->fr_ifa == ifp) 384145516Sdarrenr f->fr_ifa = (void *)-1; 385145516Sdarrenr for (f = ipfilter[1][fr_active]; (f != NULL); f = f->fr_next) 386145516Sdarrenr if (f->fr_ifa == ifp) 387145516Sdarrenr f->fr_ifa = (void *)-1; 388145516Sdarrenr#ifdef USE_INET6 389145516Sdarrenr for (f = ipacct6[0][fr_active]; (f != NULL); f = f->fr_next) 390145516Sdarrenr if (f->fr_ifa == ifp) 391145516Sdarrenr f->fr_ifa = (void *)-1; 392145516Sdarrenr for (f = ipacct6[1][fr_active]; (f != NULL); f = f->fr_next) 393145516Sdarrenr if (f->fr_ifa == ifp) 394145516Sdarrenr f->fr_ifa = (void *)-1; 395145516Sdarrenr for (f = ipfilter6[0][fr_active]; (f != NULL); f = f->fr_next) 396145516Sdarrenr if (f->fr_ifa == ifp) 397145516Sdarrenr f->fr_ifa = (void *)-1; 398145516Sdarrenr for (f = ipfilter6[1][fr_active]; (f != NULL); f = f->fr_next) 399145516Sdarrenr if (f->fr_ifa == ifp) 400145516Sdarrenr f->fr_ifa = (void *)-1; 401145516Sdarrenr#endif 402145516Sdarrenr RWLOCK_EXIT(&ipf_mutex); 403145516Sdarrenr fr_natsync(ifp); 404145516Sdarrenr} 405145516Sdarrenr#endif 406145516Sdarrenr 407145516Sdarrenr 408145516Sdarrenr/* 409145516Sdarrenr * routines below for saving IP headers to buffer 410145516Sdarrenr */ 411145516Sdarrenrint iplopen(dev, flags 412145516Sdarrenr#if ((BSD >= 199506) || (__FreeBSD_version >= 220000)) && defined(_KERNEL) 413145516Sdarrenr, devtype, p) 414145516Sdarrenrint devtype; 415145516Sdarrenr# if (__FreeBSD_version >= 500024) 416145516Sdarrenrstruct thread *p; 417145516Sdarrenr# else 418145516Sdarrenrstruct proc *p; 419145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 420145516Sdarrenr#else 421145516Sdarrenr) 422145516Sdarrenr#endif 423145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 424145516Sdarrenrstruct cdev *dev; 425145516Sdarrenr#else 426145516Sdarrenrdev_t dev; 427145516Sdarrenr#endif 428145516Sdarrenrint flags; 429145516Sdarrenr{ 430145516Sdarrenr u_int min = GET_MINOR(dev); 431145516Sdarrenr 432145516Sdarrenr if (IPL_LOGMAX < min) 433145516Sdarrenr min = ENXIO; 434145516Sdarrenr else 435145516Sdarrenr min = 0; 436145516Sdarrenr return min; 437145516Sdarrenr} 438145516Sdarrenr 439145516Sdarrenr 440145516Sdarrenrint iplclose(dev, flags 441145516Sdarrenr#if ((BSD >= 199506) || (__FreeBSD_version >= 220000)) && defined(_KERNEL) 442145516Sdarrenr, devtype, p) 443145516Sdarrenrint devtype; 444145516Sdarrenr# if (__FreeBSD_version >= 500024) 445145516Sdarrenrstruct thread *p; 446145516Sdarrenr# else 447145516Sdarrenrstruct proc *p; 448145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 449145516Sdarrenr#else 450145516Sdarrenr) 451145516Sdarrenr#endif 452145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 453145516Sdarrenrstruct cdev *dev; 454145516Sdarrenr#else 455145516Sdarrenrdev_t dev; 456145516Sdarrenr#endif 457145516Sdarrenrint flags; 458145516Sdarrenr{ 459145516Sdarrenr u_int min = GET_MINOR(dev); 460145516Sdarrenr 461145516Sdarrenr if (IPL_LOGMAX < min) 462145516Sdarrenr min = ENXIO; 463145516Sdarrenr else 464145516Sdarrenr min = 0; 465145516Sdarrenr return min; 466145516Sdarrenr} 467145516Sdarrenr 468145516Sdarrenr/* 469145516Sdarrenr * iplread/ipllog 470145516Sdarrenr * both of these must operate with at least splnet() lest they be 471145516Sdarrenr * called during packet processing and cause an inconsistancy to appear in 472145516Sdarrenr * the filter lists. 473145516Sdarrenr */ 474145516Sdarrenr#if (BSD >= 199306) 475145516Sdarrenrint iplread(dev, uio, ioflag) 476145516Sdarrenrint ioflag; 477145516Sdarrenr#else 478145516Sdarrenrint iplread(dev, uio) 479145516Sdarrenr#endif 480145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 481145516Sdarrenrstruct cdev *dev; 482145516Sdarrenr#else 483145516Sdarrenrdev_t dev; 484145516Sdarrenr#endif 485145516Sdarrenrregister struct uio *uio; 486145516Sdarrenr{ 487161356Sguido u_int xmin = GET_MINOR(dev); 488145516Sdarrenr 489170268Sdarrenr if (fr_running < 1) 490170268Sdarrenr return EIO; 491170268Sdarrenr 492161356Sguido if (xmin < 0) 493161356Sguido return ENXIO; 494161356Sguido 495145516Sdarrenr# ifdef IPFILTER_SYNC 496161356Sguido if (xmin == IPL_LOGSYNC) 497145516Sdarrenr return ipfsync_read(uio); 498145516Sdarrenr# endif 499145516Sdarrenr 500145516Sdarrenr#ifdef IPFILTER_LOG 501161356Sguido return ipflog_read(xmin, uio); 502145516Sdarrenr#else 503145516Sdarrenr return ENXIO; 504145516Sdarrenr#endif 505145516Sdarrenr} 506145516Sdarrenr 507145516Sdarrenr 508145516Sdarrenr/* 509145516Sdarrenr * iplwrite 510145516Sdarrenr * both of these must operate with at least splnet() lest they be 511145516Sdarrenr * called during packet processing and cause an inconsistancy to appear in 512145516Sdarrenr * the filter lists. 513145516Sdarrenr */ 514145516Sdarrenr#if (BSD >= 199306) 515145516Sdarrenrint iplwrite(dev, uio, ioflag) 516145516Sdarrenrint ioflag; 517145516Sdarrenr#else 518145516Sdarrenrint iplwrite(dev, uio) 519145516Sdarrenr#endif 520145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 521145516Sdarrenrstruct cdev *dev; 522145516Sdarrenr#else 523145516Sdarrenrdev_t dev; 524145516Sdarrenr#endif 525145516Sdarrenrregister struct uio *uio; 526145516Sdarrenr{ 527145516Sdarrenr 528170268Sdarrenr if (fr_running < 1) 529170268Sdarrenr return EIO; 530170268Sdarrenr 531145516Sdarrenr#ifdef IPFILTER_SYNC 532145516Sdarrenr if (GET_MINOR(dev) == IPL_LOGSYNC) 533145516Sdarrenr return ipfsync_write(uio); 534145516Sdarrenr#endif 535145516Sdarrenr return ENXIO; 536145516Sdarrenr} 537145516Sdarrenr 538145516Sdarrenr 539145516Sdarrenr/* 540145516Sdarrenr * fr_send_reset - this could conceivably be a call to tcp_respond(), but that 541145516Sdarrenr * requires a large amount of setting up and isn't any more efficient. 542145516Sdarrenr */ 543145516Sdarrenrint fr_send_reset(fin) 544145516Sdarrenrfr_info_t *fin; 545145516Sdarrenr{ 546145516Sdarrenr struct tcphdr *tcp, *tcp2; 547145516Sdarrenr int tlen = 0, hlen; 548145516Sdarrenr struct mbuf *m; 549145516Sdarrenr#ifdef USE_INET6 550145516Sdarrenr ip6_t *ip6; 551145516Sdarrenr#endif 552145516Sdarrenr ip_t *ip; 553145516Sdarrenr 554145516Sdarrenr tcp = fin->fin_dp; 555145516Sdarrenr if (tcp->th_flags & TH_RST) 556145516Sdarrenr return -1; /* feedback loop */ 557145516Sdarrenr 558145516Sdarrenr if (fr_checkl4sum(fin) == -1) 559145516Sdarrenr return -1; 560145516Sdarrenr 561145516Sdarrenr tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) + 562145516Sdarrenr ((tcp->th_flags & TH_SYN) ? 1 : 0) + 563145516Sdarrenr ((tcp->th_flags & TH_FIN) ? 1 : 0); 564145516Sdarrenr 565145516Sdarrenr#ifdef USE_INET6 566145516Sdarrenr hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t); 567145516Sdarrenr#else 568145516Sdarrenr hlen = sizeof(ip_t); 569145516Sdarrenr#endif 570145516Sdarrenr#ifdef MGETHDR 571145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 572145516Sdarrenr#else 573145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 574145516Sdarrenr#endif 575145516Sdarrenr if (m == NULL) 576145516Sdarrenr return -1; 577145516Sdarrenr if (sizeof(*tcp2) + hlen > MLEN) { 578145516Sdarrenr MCLGET(m, M_DONTWAIT); 579145516Sdarrenr if ((m->m_flags & M_EXT) == 0) { 580145516Sdarrenr FREE_MB_T(m); 581145516Sdarrenr return -1; 582145516Sdarrenr } 583145516Sdarrenr } 584145516Sdarrenr 585145516Sdarrenr m->m_len = sizeof(*tcp2) + hlen; 586145516Sdarrenr#if (BSD >= 199103) 587145516Sdarrenr m->m_data += max_linkhdr; 588145516Sdarrenr m->m_pkthdr.len = m->m_len; 589145516Sdarrenr m->m_pkthdr.rcvif = (struct ifnet *)0; 590145516Sdarrenr#endif 591145516Sdarrenr ip = mtod(m, struct ip *); 592145516Sdarrenr bzero((char *)ip, hlen); 593145516Sdarrenr#ifdef USE_INET6 594145516Sdarrenr ip6 = (ip6_t *)ip; 595145516Sdarrenr#endif 596145516Sdarrenr tcp2 = (struct tcphdr *)((char *)ip + hlen); 597145516Sdarrenr tcp2->th_sport = tcp->th_dport; 598145516Sdarrenr tcp2->th_dport = tcp->th_sport; 599145516Sdarrenr 600145516Sdarrenr if (tcp->th_flags & TH_ACK) { 601145516Sdarrenr tcp2->th_seq = tcp->th_ack; 602145516Sdarrenr tcp2->th_flags = TH_RST; 603145516Sdarrenr tcp2->th_ack = 0; 604145516Sdarrenr } else { 605145516Sdarrenr tcp2->th_seq = 0; 606145516Sdarrenr tcp2->th_ack = ntohl(tcp->th_seq); 607145516Sdarrenr tcp2->th_ack += tlen; 608145516Sdarrenr tcp2->th_ack = htonl(tcp2->th_ack); 609145516Sdarrenr tcp2->th_flags = TH_RST|TH_ACK; 610145516Sdarrenr } 611145516Sdarrenr TCP_X2_A(tcp2, 0); 612145516Sdarrenr TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2); 613145516Sdarrenr tcp2->th_win = tcp->th_win; 614145516Sdarrenr tcp2->th_sum = 0; 615145516Sdarrenr tcp2->th_urp = 0; 616145516Sdarrenr 617145516Sdarrenr#ifdef USE_INET6 618145516Sdarrenr if (fin->fin_v == 6) { 619145516Sdarrenr ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 620145516Sdarrenr ip6->ip6_plen = htons(sizeof(struct tcphdr)); 621145516Sdarrenr ip6->ip6_nxt = IPPROTO_TCP; 622145516Sdarrenr ip6->ip6_hlim = 0; 623145516Sdarrenr ip6->ip6_src = fin->fin_dst6; 624145516Sdarrenr ip6->ip6_dst = fin->fin_src6; 625145516Sdarrenr tcp2->th_sum = in6_cksum(m, IPPROTO_TCP, 626145516Sdarrenr sizeof(*ip6), sizeof(*tcp2)); 627145516Sdarrenr return fr_send_ip(fin, m, &m); 628145516Sdarrenr } 629145516Sdarrenr#endif 630145516Sdarrenr ip->ip_p = IPPROTO_TCP; 631145516Sdarrenr ip->ip_len = htons(sizeof(struct tcphdr)); 632145516Sdarrenr ip->ip_src.s_addr = fin->fin_daddr; 633145516Sdarrenr ip->ip_dst.s_addr = fin->fin_saddr; 634145516Sdarrenr tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2)); 635145516Sdarrenr ip->ip_len = hlen + sizeof(*tcp2); 636145516Sdarrenr return fr_send_ip(fin, m, &m); 637145516Sdarrenr} 638145516Sdarrenr 639145516Sdarrenr 640145516Sdarrenrstatic int fr_send_ip(fin, m, mpp) 641145516Sdarrenrfr_info_t *fin; 642145516Sdarrenrmb_t *m, **mpp; 643145516Sdarrenr{ 644145516Sdarrenr fr_info_t fnew; 645145516Sdarrenr ip_t *ip, *oip; 646145516Sdarrenr int hlen; 647145516Sdarrenr 648145516Sdarrenr ip = mtod(m, ip_t *); 649145516Sdarrenr bzero((char *)&fnew, sizeof(fnew)); 650145516Sdarrenr 651145516Sdarrenr IP_V_A(ip, fin->fin_v); 652145516Sdarrenr switch (fin->fin_v) 653145516Sdarrenr { 654145516Sdarrenr case 4 : 655145516Sdarrenr fnew.fin_v = 4; 656145516Sdarrenr oip = fin->fin_ip; 657145516Sdarrenr IP_HL_A(ip, sizeof(*oip) >> 2); 658145516Sdarrenr ip->ip_tos = oip->ip_tos; 659145516Sdarrenr ip->ip_id = fin->fin_ip->ip_id; 660145516Sdarrenr#if (__FreeBSD_version > 460000) 661181803Sbz ip->ip_off = V_path_mtu_discovery ? IP_DF : 0; 662145516Sdarrenr#else 663145516Sdarrenr ip->ip_off = 0; 664145516Sdarrenr#endif 665181803Sbz ip->ip_ttl = V_ip_defttl; 666145516Sdarrenr ip->ip_sum = 0; 667145516Sdarrenr hlen = sizeof(*oip); 668145516Sdarrenr break; 669145516Sdarrenr#ifdef USE_INET6 670145516Sdarrenr case 6 : 671145516Sdarrenr { 672145516Sdarrenr ip6_t *ip6 = (ip6_t *)ip; 673145516Sdarrenr 674145516Sdarrenr ip6->ip6_vfc = 0x60; 675145516Sdarrenr ip6->ip6_hlim = IPDEFTTL; 676145516Sdarrenr 677145516Sdarrenr fnew.fin_v = 6; 678145516Sdarrenr hlen = sizeof(*ip6); 679145516Sdarrenr break; 680145516Sdarrenr } 681145516Sdarrenr#endif 682145516Sdarrenr default : 683145516Sdarrenr return EINVAL; 684145516Sdarrenr } 685145516Sdarrenr#ifdef IPSEC 686145516Sdarrenr m->m_pkthdr.rcvif = NULL; 687145516Sdarrenr#endif 688145516Sdarrenr 689145516Sdarrenr fnew.fin_ifp = fin->fin_ifp; 690145516Sdarrenr fnew.fin_flx = FI_NOCKSUM; 691145516Sdarrenr fnew.fin_m = m; 692145516Sdarrenr fnew.fin_ip = ip; 693145516Sdarrenr fnew.fin_mp = mpp; 694145516Sdarrenr fnew.fin_hlen = hlen; 695145516Sdarrenr fnew.fin_dp = (char *)ip + hlen; 696145516Sdarrenr (void) fr_makefrip(hlen, ip, &fnew); 697145516Sdarrenr 698145516Sdarrenr return fr_fastroute(m, mpp, &fnew, NULL); 699145516Sdarrenr} 700145516Sdarrenr 701145516Sdarrenr 702145516Sdarrenrint fr_send_icmp_err(type, fin, dst) 703145516Sdarrenrint type; 704145516Sdarrenrfr_info_t *fin; 705145516Sdarrenrint dst; 706145516Sdarrenr{ 707145516Sdarrenr int err, hlen, xtra, iclen, ohlen, avail, code; 708145516Sdarrenr struct in_addr dst4; 709145516Sdarrenr struct icmp *icmp; 710145516Sdarrenr struct mbuf *m; 711145516Sdarrenr void *ifp; 712145516Sdarrenr#ifdef USE_INET6 713145516Sdarrenr ip6_t *ip6; 714145516Sdarrenr struct in6_addr dst6; 715145516Sdarrenr#endif 716145516Sdarrenr ip_t *ip, *ip2; 717145516Sdarrenr 718172776Sdarrenr if ((type < 0) || (type >= ICMP_MAXTYPE)) 719145516Sdarrenr return -1; 720145516Sdarrenr 721145516Sdarrenr code = fin->fin_icode; 722145516Sdarrenr#ifdef USE_INET6 723145516Sdarrenr if ((code < 0) || (code > sizeof(icmptoicmp6unreach)/sizeof(int))) 724145516Sdarrenr return -1; 725145516Sdarrenr#endif 726145516Sdarrenr 727145516Sdarrenr if (fr_checkl4sum(fin) == -1) 728145516Sdarrenr return -1; 729145516Sdarrenr#ifdef MGETHDR 730145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 731145516Sdarrenr#else 732145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 733145516Sdarrenr#endif 734145516Sdarrenr if (m == NULL) 735145516Sdarrenr return -1; 736145516Sdarrenr avail = MHLEN; 737145516Sdarrenr 738145516Sdarrenr xtra = 0; 739145516Sdarrenr hlen = 0; 740145516Sdarrenr ohlen = 0; 741145516Sdarrenr ifp = fin->fin_ifp; 742145516Sdarrenr if (fin->fin_v == 4) { 743145516Sdarrenr if ((fin->fin_p == IPPROTO_ICMP) && 744145516Sdarrenr !(fin->fin_flx & FI_SHORT)) 745145516Sdarrenr switch (ntohs(fin->fin_data[0]) >> 8) 746145516Sdarrenr { 747145516Sdarrenr case ICMP_ECHO : 748145516Sdarrenr case ICMP_TSTAMP : 749145516Sdarrenr case ICMP_IREQ : 750145516Sdarrenr case ICMP_MASKREQ : 751145516Sdarrenr break; 752145516Sdarrenr default : 753145516Sdarrenr FREE_MB_T(m); 754145516Sdarrenr return 0; 755145516Sdarrenr } 756145516Sdarrenr 757145516Sdarrenr if (dst == 0) { 758145516Sdarrenr if (fr_ifpaddr(4, FRI_NORMAL, ifp, 759145516Sdarrenr &dst4, NULL) == -1) { 760145516Sdarrenr FREE_MB_T(m); 761145516Sdarrenr return -1; 762145516Sdarrenr } 763145516Sdarrenr } else 764145516Sdarrenr dst4.s_addr = fin->fin_daddr; 765145516Sdarrenr 766145516Sdarrenr hlen = sizeof(ip_t); 767145516Sdarrenr ohlen = fin->fin_hlen; 768145516Sdarrenr if (fin->fin_hlen < fin->fin_plen) 769145516Sdarrenr xtra = MIN(fin->fin_dlen, 8); 770145516Sdarrenr else 771145516Sdarrenr xtra = 0; 772145516Sdarrenr } 773145516Sdarrenr 774145516Sdarrenr#ifdef USE_INET6 775145516Sdarrenr else if (fin->fin_v == 6) { 776145516Sdarrenr hlen = sizeof(ip6_t); 777145516Sdarrenr ohlen = sizeof(ip6_t); 778145516Sdarrenr type = icmptoicmp6types[type]; 779145516Sdarrenr if (type == ICMP6_DST_UNREACH) 780145516Sdarrenr code = icmptoicmp6unreach[code]; 781145516Sdarrenr 782145516Sdarrenr if (hlen + sizeof(*icmp) + max_linkhdr + 783145516Sdarrenr fin->fin_plen > avail) { 784145516Sdarrenr MCLGET(m, M_DONTWAIT); 785145516Sdarrenr if ((m->m_flags & M_EXT) == 0) { 786145516Sdarrenr FREE_MB_T(m); 787145516Sdarrenr return -1; 788145516Sdarrenr } 789145516Sdarrenr avail = MCLBYTES; 790145516Sdarrenr } 791145516Sdarrenr xtra = MIN(fin->fin_plen, 792145516Sdarrenr avail - hlen - sizeof(*icmp) - max_linkhdr); 793145516Sdarrenr if (dst == 0) { 794145516Sdarrenr if (fr_ifpaddr(6, FRI_NORMAL, ifp, 795145516Sdarrenr (struct in_addr *)&dst6, NULL) == -1) { 796145516Sdarrenr FREE_MB_T(m); 797145516Sdarrenr return -1; 798145516Sdarrenr } 799145516Sdarrenr } else 800145516Sdarrenr dst6 = fin->fin_dst6; 801145516Sdarrenr } 802145516Sdarrenr#endif 803145516Sdarrenr else { 804145516Sdarrenr FREE_MB_T(m); 805145516Sdarrenr return -1; 806145516Sdarrenr } 807145516Sdarrenr 808145516Sdarrenr iclen = hlen + sizeof(*icmp); 809145516Sdarrenr avail -= (max_linkhdr + iclen); 810145516Sdarrenr if (avail < 0) { 811145516Sdarrenr FREE_MB_T(m); 812145516Sdarrenr return -1; 813145516Sdarrenr } 814145516Sdarrenr if (xtra > avail) 815145516Sdarrenr xtra = avail; 816145516Sdarrenr iclen += xtra; 817145516Sdarrenr m->m_data += max_linkhdr; 818145516Sdarrenr m->m_pkthdr.rcvif = (struct ifnet *)0; 819145516Sdarrenr m->m_pkthdr.len = iclen; 820145516Sdarrenr m->m_len = iclen; 821145516Sdarrenr ip = mtod(m, ip_t *); 822145516Sdarrenr icmp = (struct icmp *)((char *)ip + hlen); 823145516Sdarrenr ip2 = (ip_t *)&icmp->icmp_ip; 824145516Sdarrenr 825145516Sdarrenr icmp->icmp_type = type; 826145516Sdarrenr icmp->icmp_code = fin->fin_icode; 827145516Sdarrenr icmp->icmp_cksum = 0; 828145516Sdarrenr#ifdef icmp_nextmtu 829145516Sdarrenr if (type == ICMP_UNREACH && 830145516Sdarrenr fin->fin_icode == ICMP_UNREACH_NEEDFRAG && ifp) 831145516Sdarrenr icmp->icmp_nextmtu = htons(((struct ifnet *)ifp)->if_mtu); 832145516Sdarrenr#endif 833145516Sdarrenr 834145516Sdarrenr bcopy((char *)fin->fin_ip, (char *)ip2, ohlen); 835145516Sdarrenr 836145516Sdarrenr#ifdef USE_INET6 837145516Sdarrenr ip6 = (ip6_t *)ip; 838145516Sdarrenr if (fin->fin_v == 6) { 839145516Sdarrenr ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 840145516Sdarrenr ip6->ip6_plen = htons(iclen - hlen); 841145516Sdarrenr ip6->ip6_nxt = IPPROTO_ICMPV6; 842145516Sdarrenr ip6->ip6_hlim = 0; 843145516Sdarrenr ip6->ip6_src = dst6; 844145516Sdarrenr ip6->ip6_dst = fin->fin_src6; 845145516Sdarrenr if (xtra > 0) 846145516Sdarrenr bcopy((char *)fin->fin_ip + ohlen, 847145516Sdarrenr (char *)&icmp->icmp_ip + ohlen, xtra); 848145516Sdarrenr icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6, 849145516Sdarrenr sizeof(*ip6), iclen - hlen); 850145516Sdarrenr } else 851145516Sdarrenr#endif 852145516Sdarrenr { 853145516Sdarrenr ip2->ip_len = htons(ip2->ip_len); 854145516Sdarrenr ip2->ip_off = htons(ip2->ip_off); 855145516Sdarrenr ip->ip_p = IPPROTO_ICMP; 856145516Sdarrenr ip->ip_src.s_addr = dst4.s_addr; 857145516Sdarrenr ip->ip_dst.s_addr = fin->fin_saddr; 858145516Sdarrenr 859145516Sdarrenr if (xtra > 0) 860145516Sdarrenr bcopy((char *)fin->fin_ip + ohlen, 861145516Sdarrenr (char *)&icmp->icmp_ip + ohlen, xtra); 862145516Sdarrenr icmp->icmp_cksum = ipf_cksum((u_short *)icmp, 863145516Sdarrenr sizeof(*icmp) + 8); 864145516Sdarrenr ip->ip_len = iclen; 865145516Sdarrenr ip->ip_p = IPPROTO_ICMP; 866145516Sdarrenr } 867145516Sdarrenr err = fr_send_ip(fin, m, &m); 868145516Sdarrenr return err; 869145516Sdarrenr} 870145516Sdarrenr 871145516Sdarrenr 872145516Sdarrenr#if !defined(IPFILTER_LKM) && (__FreeBSD_version < 300000) 873145516Sdarrenr# if (BSD < 199306) 874145516Sdarrenrint iplinit __P((void)); 875145516Sdarrenr 876145516Sdarrenrint 877145516Sdarrenr# else 878145516Sdarrenrvoid iplinit __P((void)); 879145516Sdarrenr 880145516Sdarrenrvoid 881145516Sdarrenr# endif 882145516Sdarrenriplinit() 883145516Sdarrenr{ 884170268Sdarrenr if (ipfattach() != 0) 885145516Sdarrenr printf("IP Filter failed to attach\n"); 886145516Sdarrenr ip_init(); 887145516Sdarrenr} 888145516Sdarrenr#endif /* __FreeBSD_version < 300000 */ 889145516Sdarrenr 890145516Sdarrenr 891173181Sdarrenr/* 892173181Sdarrenr * m0 - pointer to mbuf where the IP packet starts 893173181Sdarrenr * mpp - pointer to the mbuf pointer that is the start of the mbuf chain 894173181Sdarrenr */ 895145516Sdarrenrint fr_fastroute(m0, mpp, fin, fdp) 896145516Sdarrenrmb_t *m0, **mpp; 897145516Sdarrenrfr_info_t *fin; 898145516Sdarrenrfrdest_t *fdp; 899145516Sdarrenr{ 900145516Sdarrenr register struct ip *ip, *mhip; 901173181Sdarrenr register struct mbuf *m = *mpp; 902145516Sdarrenr register struct route *ro; 903145516Sdarrenr int len, off, error = 0, hlen, code; 904145516Sdarrenr struct ifnet *ifp, *sifp; 905145516Sdarrenr struct sockaddr_in *dst; 906145516Sdarrenr struct route iproute; 907145516Sdarrenr u_short ip_off; 908145516Sdarrenr frentry_t *fr; 909145516Sdarrenr 910161356Sguido ro = NULL; 911161356Sguido 912145516Sdarrenr#ifdef M_WRITABLE 913145516Sdarrenr /* 914145516Sdarrenr * HOT FIX/KLUDGE: 915145516Sdarrenr * 916145516Sdarrenr * If the mbuf we're about to send is not writable (because of 917145516Sdarrenr * a cluster reference, for example) we'll need to make a copy 918145516Sdarrenr * of it since this routine modifies the contents. 919145516Sdarrenr * 920145516Sdarrenr * If you have non-crappy network hardware that can transmit data 921145516Sdarrenr * from the mbuf, rather than making a copy, this is gonna be a 922145516Sdarrenr * problem. 923145516Sdarrenr */ 924145516Sdarrenr if (M_WRITABLE(m) == 0) { 925161356Sguido m0 = m_dup(m, M_DONTWAIT); 926161356Sguido if (m0 != 0) { 927145516Sdarrenr FREE_MB_T(m); 928145516Sdarrenr m = m0; 929145516Sdarrenr *mpp = m; 930145516Sdarrenr } else { 931145516Sdarrenr error = ENOBUFS; 932145516Sdarrenr FREE_MB_T(m); 933161356Sguido goto done; 934145516Sdarrenr } 935145516Sdarrenr } 936145516Sdarrenr#endif 937145516Sdarrenr 938145516Sdarrenr#ifdef USE_INET6 939145516Sdarrenr if (fin->fin_v == 6) { 940145516Sdarrenr /* 941145516Sdarrenr * currently "to <if>" and "to <if>:ip#" are not supported 942145516Sdarrenr * for IPv6 943145516Sdarrenr */ 944145516Sdarrenr#if (__FreeBSD_version >= 490000) 945145516Sdarrenr return ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 946145516Sdarrenr#else 947145516Sdarrenr return ip6_output(m0, NULL, NULL, 0, NULL, NULL); 948145516Sdarrenr#endif 949145516Sdarrenr } 950145516Sdarrenr#endif 951145516Sdarrenr 952145516Sdarrenr hlen = fin->fin_hlen; 953145516Sdarrenr ip = mtod(m0, struct ip *); 954145516Sdarrenr 955145516Sdarrenr /* 956145516Sdarrenr * Route packet. 957145516Sdarrenr */ 958145516Sdarrenr ro = &iproute; 959145516Sdarrenr bzero((caddr_t)ro, sizeof (*ro)); 960145516Sdarrenr dst = (struct sockaddr_in *)&ro->ro_dst; 961145516Sdarrenr dst->sin_family = AF_INET; 962145516Sdarrenr dst->sin_addr = ip->ip_dst; 963145516Sdarrenr 964145516Sdarrenr fr = fin->fin_fr; 965145516Sdarrenr if (fdp != NULL) 966145516Sdarrenr ifp = fdp->fd_ifp; 967145516Sdarrenr else 968145516Sdarrenr ifp = fin->fin_ifp; 969145516Sdarrenr 970145516Sdarrenr if ((ifp == NULL) && (!fr || !(fr->fr_flags & FR_FASTROUTE))) { 971145516Sdarrenr error = -2; 972145516Sdarrenr goto bad; 973145516Sdarrenr } 974145516Sdarrenr 975161356Sguido if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 976161356Sguido dst->sin_addr = fdp->fd_ip; 977145516Sdarrenr 978145516Sdarrenr dst->sin_len = sizeof(*dst); 979178888Sjulian in_rtalloc(ro, 0); 980145516Sdarrenr 981145516Sdarrenr if ((ifp == NULL) && (ro->ro_rt != NULL)) 982145516Sdarrenr ifp = ro->ro_rt->rt_ifp; 983145516Sdarrenr 984145516Sdarrenr if ((ro->ro_rt == NULL) || (ifp == NULL)) { 985145516Sdarrenr if (in_localaddr(ip->ip_dst)) 986145516Sdarrenr error = EHOSTUNREACH; 987145516Sdarrenr else 988145516Sdarrenr error = ENETUNREACH; 989145516Sdarrenr goto bad; 990145516Sdarrenr } 991145516Sdarrenr if (ro->ro_rt->rt_flags & RTF_GATEWAY) 992145516Sdarrenr dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; 993145516Sdarrenr if (ro->ro_rt) 994145516Sdarrenr ro->ro_rt->rt_use++; 995145516Sdarrenr 996145516Sdarrenr /* 997145516Sdarrenr * For input packets which are being "fastrouted", they won't 998145516Sdarrenr * go back through output filtering and miss their chance to get 999170268Sdarrenr * NAT'd and counted. Duplicated packets aren't considered to be 1000170268Sdarrenr * part of the normal packet stream, so do not NAT them or pass 1001170268Sdarrenr * them through stateful checking, etc. 1002145516Sdarrenr */ 1003170268Sdarrenr if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) { 1004145516Sdarrenr sifp = fin->fin_ifp; 1005145516Sdarrenr fin->fin_ifp = ifp; 1006145516Sdarrenr fin->fin_out = 1; 1007145516Sdarrenr (void) fr_acctpkt(fin, NULL); 1008145516Sdarrenr fin->fin_fr = NULL; 1009145516Sdarrenr if (!fr || !(fr->fr_flags & FR_RETMASK)) { 1010145516Sdarrenr u_32_t pass; 1011145516Sdarrenr 1012170268Sdarrenr if (fr_checkstate(fin, &pass) != NULL) 1013170268Sdarrenr fr_statederef((ipstate_t **)&fin->fin_state); 1014145516Sdarrenr } 1015145516Sdarrenr 1016145516Sdarrenr switch (fr_checknatout(fin, NULL)) 1017145516Sdarrenr { 1018145516Sdarrenr case 0 : 1019145516Sdarrenr break; 1020145516Sdarrenr case 1 : 1021170268Sdarrenr fr_natderef((nat_t **)&fin->fin_nat); 1022145516Sdarrenr ip->ip_sum = 0; 1023145516Sdarrenr break; 1024145516Sdarrenr case -1 : 1025145516Sdarrenr error = -1; 1026173181Sdarrenr goto bad; 1027145516Sdarrenr break; 1028145516Sdarrenr } 1029145516Sdarrenr 1030145516Sdarrenr fin->fin_ifp = sifp; 1031145516Sdarrenr fin->fin_out = 0; 1032145516Sdarrenr } else 1033145516Sdarrenr ip->ip_sum = 0; 1034145516Sdarrenr /* 1035145516Sdarrenr * If small enough for interface, can just send directly. 1036145516Sdarrenr */ 1037145516Sdarrenr if (ip->ip_len <= ifp->if_mtu) { 1038145516Sdarrenr ip->ip_len = htons(ip->ip_len); 1039145516Sdarrenr ip->ip_off = htons(ip->ip_off); 1040145516Sdarrenr 1041145516Sdarrenr if (!ip->ip_sum) 1042145516Sdarrenr ip->ip_sum = in_cksum(m, hlen); 1043145516Sdarrenr error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, 1044145516Sdarrenr ro->ro_rt); 1045145516Sdarrenr goto done; 1046145516Sdarrenr } 1047145516Sdarrenr /* 1048145516Sdarrenr * Too large for interface; fragment if possible. 1049145516Sdarrenr * Must be able to put at least 8 bytes per fragment. 1050145516Sdarrenr */ 1051145516Sdarrenr ip_off = ntohs(ip->ip_off); 1052145516Sdarrenr if (ip_off & IP_DF) { 1053145516Sdarrenr error = EMSGSIZE; 1054145516Sdarrenr goto bad; 1055145516Sdarrenr } 1056145516Sdarrenr len = (ifp->if_mtu - hlen) &~ 7; 1057145516Sdarrenr if (len < 8) { 1058145516Sdarrenr error = EMSGSIZE; 1059145516Sdarrenr goto bad; 1060145516Sdarrenr } 1061145516Sdarrenr 1062145516Sdarrenr { 1063145516Sdarrenr int mhlen, firstlen = len; 1064145516Sdarrenr struct mbuf **mnext = &m->m_act; 1065145516Sdarrenr 1066145516Sdarrenr /* 1067145516Sdarrenr * Loop through length of segment after first fragment, 1068145516Sdarrenr * make new header and copy data of each part and link onto chain. 1069145516Sdarrenr */ 1070145516Sdarrenr m0 = m; 1071145516Sdarrenr mhlen = sizeof (struct ip); 1072145516Sdarrenr for (off = hlen + len; off < ip->ip_len; off += len) { 1073145516Sdarrenr#ifdef MGETHDR 1074145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 1075145516Sdarrenr#else 1076145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 1077145516Sdarrenr#endif 1078145516Sdarrenr if (m == 0) { 1079145516Sdarrenr m = m0; 1080145516Sdarrenr error = ENOBUFS; 1081145516Sdarrenr goto bad; 1082145516Sdarrenr } 1083145516Sdarrenr m->m_data += max_linkhdr; 1084145516Sdarrenr mhip = mtod(m, struct ip *); 1085145516Sdarrenr bcopy((char *)ip, (char *)mhip, sizeof(*ip)); 1086145516Sdarrenr if (hlen > sizeof (struct ip)) { 1087145516Sdarrenr mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 1088145516Sdarrenr IP_HL_A(mhip, mhlen >> 2); 1089145516Sdarrenr } 1090145516Sdarrenr m->m_len = mhlen; 1091145516Sdarrenr mhip->ip_off = ((off - hlen) >> 3) + ip_off; 1092145516Sdarrenr if (off + len >= ip->ip_len) 1093145516Sdarrenr len = ip->ip_len - off; 1094145516Sdarrenr else 1095145516Sdarrenr mhip->ip_off |= IP_MF; 1096145516Sdarrenr mhip->ip_len = htons((u_short)(len + mhlen)); 1097161356Sguido *mnext = m; 1098145516Sdarrenr m->m_next = m_copy(m0, off, len); 1099145516Sdarrenr if (m->m_next == 0) { 1100145516Sdarrenr error = ENOBUFS; /* ??? */ 1101145516Sdarrenr goto sendorfree; 1102145516Sdarrenr } 1103145516Sdarrenr m->m_pkthdr.len = mhlen + len; 1104145516Sdarrenr m->m_pkthdr.rcvif = NULL; 1105145516Sdarrenr mhip->ip_off = htons((u_short)mhip->ip_off); 1106145516Sdarrenr mhip->ip_sum = 0; 1107145516Sdarrenr mhip->ip_sum = in_cksum(m, mhlen); 1108145516Sdarrenr mnext = &m->m_act; 1109145516Sdarrenr } 1110145516Sdarrenr /* 1111145516Sdarrenr * Update first fragment by trimming what's been copied out 1112145516Sdarrenr * and updating header, then send each fragment (in order). 1113145516Sdarrenr */ 1114145516Sdarrenr m_adj(m0, hlen + firstlen - ip->ip_len); 1115145516Sdarrenr ip->ip_len = htons((u_short)(hlen + firstlen)); 1116145516Sdarrenr ip->ip_off = htons((u_short)IP_MF); 1117145516Sdarrenr ip->ip_sum = 0; 1118145516Sdarrenr ip->ip_sum = in_cksum(m0, hlen); 1119145516Sdarrenrsendorfree: 1120145516Sdarrenr for (m = m0; m; m = m0) { 1121145516Sdarrenr m0 = m->m_act; 1122145516Sdarrenr m->m_act = 0; 1123145516Sdarrenr if (error == 0) 1124145516Sdarrenr error = (*ifp->if_output)(ifp, m, 1125145516Sdarrenr (struct sockaddr *)dst, ro->ro_rt); 1126145516Sdarrenr else 1127145516Sdarrenr FREE_MB_T(m); 1128145516Sdarrenr } 1129145516Sdarrenr } 1130145516Sdarrenrdone: 1131145516Sdarrenr if (!error) 1132145516Sdarrenr fr_frouteok[0]++; 1133145516Sdarrenr else 1134145516Sdarrenr fr_frouteok[1]++; 1135145516Sdarrenr 1136161356Sguido if ((ro != NULL) && (ro->ro_rt != NULL)) { 1137145516Sdarrenr RTFREE(ro->ro_rt); 1138145516Sdarrenr } 1139145516Sdarrenr *mpp = NULL; 1140145516Sdarrenr return 0; 1141145516Sdarrenrbad: 1142145516Sdarrenr if (error == EMSGSIZE) { 1143145516Sdarrenr sifp = fin->fin_ifp; 1144145516Sdarrenr code = fin->fin_icode; 1145145516Sdarrenr fin->fin_icode = ICMP_UNREACH_NEEDFRAG; 1146145516Sdarrenr fin->fin_ifp = ifp; 1147145516Sdarrenr (void) fr_send_icmp_err(ICMP_UNREACH, fin, 1); 1148145516Sdarrenr fin->fin_ifp = sifp; 1149145516Sdarrenr fin->fin_icode = code; 1150145516Sdarrenr } 1151145516Sdarrenr FREE_MB_T(m); 1152145516Sdarrenr goto done; 1153145516Sdarrenr} 1154145516Sdarrenr 1155145516Sdarrenr 1156145516Sdarrenrint fr_verifysrc(fin) 1157145516Sdarrenrfr_info_t *fin; 1158145516Sdarrenr{ 1159145516Sdarrenr struct sockaddr_in *dst; 1160145516Sdarrenr struct route iproute; 1161145516Sdarrenr 1162145516Sdarrenr bzero((char *)&iproute, sizeof(iproute)); 1163145516Sdarrenr dst = (struct sockaddr_in *)&iproute.ro_dst; 1164145516Sdarrenr dst->sin_len = sizeof(*dst); 1165145516Sdarrenr dst->sin_family = AF_INET; 1166145516Sdarrenr dst->sin_addr = fin->fin_src; 1167178888Sjulian in_rtalloc(&iproute, 0); 1168145516Sdarrenr if (iproute.ro_rt == NULL) 1169145516Sdarrenr return 0; 1170145516Sdarrenr return (fin->fin_ifp == iproute.ro_rt->rt_ifp); 1171145516Sdarrenr} 1172145516Sdarrenr 1173145516Sdarrenr 1174145516Sdarrenr/* 1175145516Sdarrenr * return the first IP Address associated with an interface 1176145516Sdarrenr */ 1177145516Sdarrenrint fr_ifpaddr(v, atype, ifptr, inp, inpmask) 1178145516Sdarrenrint v, atype; 1179145516Sdarrenrvoid *ifptr; 1180145516Sdarrenrstruct in_addr *inp, *inpmask; 1181145516Sdarrenr{ 1182145516Sdarrenr#ifdef USE_INET6 1183145516Sdarrenr struct in6_addr *inp6 = NULL; 1184145516Sdarrenr#endif 1185145516Sdarrenr struct sockaddr *sock, *mask; 1186145516Sdarrenr struct sockaddr_in *sin; 1187145516Sdarrenr struct ifaddr *ifa; 1188145516Sdarrenr struct ifnet *ifp; 1189145516Sdarrenr 1190145516Sdarrenr if ((ifptr == NULL) || (ifptr == (void *)-1)) 1191145516Sdarrenr return -1; 1192145516Sdarrenr 1193145516Sdarrenr sin = NULL; 1194145516Sdarrenr ifp = ifptr; 1195145516Sdarrenr 1196145516Sdarrenr if (v == 4) 1197145516Sdarrenr inp->s_addr = 0; 1198145516Sdarrenr#ifdef USE_INET6 1199145516Sdarrenr else if (v == 6) 1200145516Sdarrenr bzero((char *)inp, sizeof(struct in6_addr)); 1201145516Sdarrenr#endif 1202145516Sdarrenr#if (__FreeBSD_version >= 300000) 1203145516Sdarrenr ifa = TAILQ_FIRST(&ifp->if_addrhead); 1204145516Sdarrenr#else 1205145516Sdarrenr ifa = ifp->if_addrlist; 1206145516Sdarrenr#endif /* __FreeBSD_version >= 300000 */ 1207145516Sdarrenr 1208145516Sdarrenr sock = ifa->ifa_addr; 1209145516Sdarrenr while (sock != NULL && ifa != NULL) { 1210145516Sdarrenr sin = (struct sockaddr_in *)sock; 1211145516Sdarrenr if ((v == 4) && (sin->sin_family == AF_INET)) 1212145516Sdarrenr break; 1213145516Sdarrenr#ifdef USE_INET6 1214145516Sdarrenr if ((v == 6) && (sin->sin_family == AF_INET6)) { 1215145516Sdarrenr inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; 1216145516Sdarrenr if (!IN6_IS_ADDR_LINKLOCAL(inp6) && 1217145516Sdarrenr !IN6_IS_ADDR_LOOPBACK(inp6)) 1218145516Sdarrenr break; 1219145516Sdarrenr } 1220145516Sdarrenr#endif 1221145516Sdarrenr#if (__FreeBSD_version >= 300000) 1222145516Sdarrenr ifa = TAILQ_NEXT(ifa, ifa_link); 1223145516Sdarrenr#else 1224145516Sdarrenr ifa = ifa->ifa_next; 1225145516Sdarrenr#endif /* __FreeBSD_version >= 300000 */ 1226145516Sdarrenr if (ifa != NULL) 1227145516Sdarrenr sock = ifa->ifa_addr; 1228145516Sdarrenr } 1229145516Sdarrenr 1230145516Sdarrenr if (ifa == NULL || sin == NULL) 1231145516Sdarrenr return -1; 1232145516Sdarrenr 1233145516Sdarrenr mask = ifa->ifa_netmask; 1234145516Sdarrenr if (atype == FRI_BROADCAST) 1235145516Sdarrenr sock = ifa->ifa_broadaddr; 1236145516Sdarrenr else if (atype == FRI_PEERADDR) 1237145516Sdarrenr sock = ifa->ifa_dstaddr; 1238145516Sdarrenr 1239161356Sguido if (sock == NULL) 1240161356Sguido return -1; 1241161356Sguido 1242145516Sdarrenr#ifdef USE_INET6 1243145516Sdarrenr if (v == 6) { 1244145516Sdarrenr return fr_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock, 1245145516Sdarrenr (struct sockaddr_in6 *)mask, 1246145516Sdarrenr inp, inpmask); 1247145516Sdarrenr } 1248145516Sdarrenr#endif 1249145516Sdarrenr return fr_ifpfillv4addr(atype, (struct sockaddr_in *)sock, 1250145516Sdarrenr (struct sockaddr_in *)mask, inp, inpmask); 1251145516Sdarrenr} 1252145516Sdarrenr 1253145516Sdarrenr 1254145516Sdarrenru_32_t fr_newisn(fin) 1255145516Sdarrenrfr_info_t *fin; 1256145516Sdarrenr{ 1257145516Sdarrenr u_32_t newiss; 1258145516Sdarrenr#if (__FreeBSD_version >= 400000) 1259145516Sdarrenr newiss = arc4random(); 1260145516Sdarrenr#else 1261145516Sdarrenr static iss_seq_off = 0; 1262145516Sdarrenr u_char hash[16]; 1263145516Sdarrenr MD5_CTX ctx; 1264145516Sdarrenr 1265145516Sdarrenr /* 1266145516Sdarrenr * Compute the base value of the ISS. It is a hash 1267145516Sdarrenr * of (saddr, sport, daddr, dport, secret). 1268145516Sdarrenr */ 1269145516Sdarrenr MD5Init(&ctx); 1270145516Sdarrenr 1271145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, 1272145516Sdarrenr sizeof(fin->fin_fi.fi_src)); 1273145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, 1274145516Sdarrenr sizeof(fin->fin_fi.fi_dst)); 1275145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); 1276145516Sdarrenr 1277145516Sdarrenr MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret)); 1278145516Sdarrenr 1279145516Sdarrenr MD5Final(hash, &ctx); 1280145516Sdarrenr 1281145516Sdarrenr memcpy(&newiss, hash, sizeof(newiss)); 1282145516Sdarrenr 1283145516Sdarrenr /* 1284145516Sdarrenr * Now increment our "timer", and add it in to 1285145516Sdarrenr * the computed value. 1286145516Sdarrenr * 1287145516Sdarrenr * XXX Use `addin'? 1288145516Sdarrenr * XXX TCP_ISSINCR too large to use? 1289145516Sdarrenr */ 1290145516Sdarrenr iss_seq_off += 0x00010000; 1291145516Sdarrenr newiss += iss_seq_off; 1292145516Sdarrenr#endif 1293145516Sdarrenr return newiss; 1294145516Sdarrenr} 1295145516Sdarrenr 1296145516Sdarrenr 1297145516Sdarrenr/* ------------------------------------------------------------------------ */ 1298145516Sdarrenr/* Function: fr_nextipid */ 1299145516Sdarrenr/* Returns: int - 0 == success, -1 == error (packet should be droppped) */ 1300145516Sdarrenr/* Parameters: fin(I) - pointer to packet information */ 1301145516Sdarrenr/* */ 1302145516Sdarrenr/* Returns the next IPv4 ID to use for this packet. */ 1303145516Sdarrenr/* ------------------------------------------------------------------------ */ 1304145516Sdarrenru_short fr_nextipid(fin) 1305145516Sdarrenrfr_info_t *fin; 1306145516Sdarrenr{ 1307145516Sdarrenr#ifndef RANDOM_IP_ID 1308145516Sdarrenr static u_short ipid = 0; 1309145516Sdarrenr u_short id; 1310145516Sdarrenr 1311145516Sdarrenr MUTEX_ENTER(&ipf_rw); 1312145516Sdarrenr id = ipid++; 1313145516Sdarrenr MUTEX_EXIT(&ipf_rw); 1314145516Sdarrenr#else 1315145516Sdarrenr u_short id; 1316145516Sdarrenr 1317145516Sdarrenr id = ip_randomid(); 1318145516Sdarrenr#endif 1319145516Sdarrenr 1320145516Sdarrenr return id; 1321145516Sdarrenr} 1322145516Sdarrenr 1323145516Sdarrenr 1324145516SdarrenrINLINE void fr_checkv4sum(fin) 1325145516Sdarrenrfr_info_t *fin; 1326145516Sdarrenr{ 1327145516Sdarrenr#ifdef CSUM_DATA_VALID 1328145516Sdarrenr int manual = 0; 1329145516Sdarrenr u_short sum; 1330145516Sdarrenr ip_t *ip; 1331145516Sdarrenr mb_t *m; 1332145516Sdarrenr 1333145516Sdarrenr if ((fin->fin_flx & FI_NOCKSUM) != 0) 1334145516Sdarrenr return; 1335145516Sdarrenr 1336172776Sdarrenr if (fin->fin_cksum != 0) 1337172776Sdarrenr return; 1338172776Sdarrenr 1339145516Sdarrenr m = fin->fin_m; 1340145516Sdarrenr if (m == NULL) { 1341145516Sdarrenr manual = 1; 1342145516Sdarrenr goto skipauto; 1343145516Sdarrenr } 1344145516Sdarrenr ip = fin->fin_ip; 1345145516Sdarrenr 1346145516Sdarrenr if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 1347145516Sdarrenr if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 1348145516Sdarrenr sum = m->m_pkthdr.csum_data; 1349145516Sdarrenr else 1350145516Sdarrenr sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, 1351145516Sdarrenr htonl(m->m_pkthdr.csum_data + 1352145516Sdarrenr fin->fin_ip->ip_len + fin->fin_p)); 1353145516Sdarrenr sum ^= 0xffff; 1354172776Sdarrenr if (sum != 0) { 1355145516Sdarrenr fin->fin_flx |= FI_BAD; 1356172776Sdarrenr fin->fin_cksum = -1; 1357172776Sdarrenr } else { 1358172776Sdarrenr fin->fin_cksum = 1; 1359172776Sdarrenr } 1360145516Sdarrenr } else 1361145516Sdarrenr manual = 1; 1362145516Sdarrenrskipauto: 1363145516Sdarrenr# ifdef IPFILTER_CKSUM 1364145516Sdarrenr if (manual != 0) 1365145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1366145516Sdarrenr fin->fin_flx |= FI_BAD; 1367145516Sdarrenr# else 1368145516Sdarrenr ; 1369145516Sdarrenr# endif 1370145516Sdarrenr#else 1371145516Sdarrenr# ifdef IPFILTER_CKSUM 1372145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1373145516Sdarrenr fin->fin_flx |= FI_BAD; 1374145516Sdarrenr# endif 1375145516Sdarrenr#endif 1376145516Sdarrenr} 1377145516Sdarrenr 1378145516Sdarrenr 1379145516Sdarrenr#ifdef USE_INET6 1380145516SdarrenrINLINE void fr_checkv6sum(fin) 1381145516Sdarrenrfr_info_t *fin; 1382145516Sdarrenr{ 1383145516Sdarrenr# ifdef IPFILTER_CKSUM 1384145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1385145516Sdarrenr fin->fin_flx |= FI_BAD; 1386145516Sdarrenr# endif 1387145516Sdarrenr} 1388145516Sdarrenr#endif /* USE_INET6 */ 1389145516Sdarrenr 1390145516Sdarrenr 1391145516Sdarrenrsize_t mbufchainlen(m0) 1392145516Sdarrenrstruct mbuf *m0; 1393145516Sdarrenr{ 1394145516Sdarrenr size_t len; 1395145516Sdarrenr 1396145516Sdarrenr if ((m0->m_flags & M_PKTHDR) != 0) { 1397145516Sdarrenr len = m0->m_pkthdr.len; 1398145516Sdarrenr } else { 1399145516Sdarrenr struct mbuf *m; 1400145516Sdarrenr 1401145516Sdarrenr for (m = m0, len = 0; m != NULL; m = m->m_next) 1402145516Sdarrenr len += m->m_len; 1403145516Sdarrenr } 1404145516Sdarrenr return len; 1405145516Sdarrenr} 1406145516Sdarrenr 1407145516Sdarrenr 1408145516Sdarrenr/* ------------------------------------------------------------------------ */ 1409145516Sdarrenr/* Function: fr_pullup */ 1410145516Sdarrenr/* Returns: NULL == pullup failed, else pointer to protocol header */ 1411145516Sdarrenr/* Parameters: m(I) - pointer to buffer where data packet starts */ 1412145516Sdarrenr/* fin(I) - pointer to packet information */ 1413145516Sdarrenr/* len(I) - number of bytes to pullup */ 1414145516Sdarrenr/* */ 1415145516Sdarrenr/* Attempt to move at least len bytes (from the start of the buffer) into a */ 1416145516Sdarrenr/* single buffer for ease of access. Operating system native functions are */ 1417145516Sdarrenr/* used to manage buffers - if necessary. If the entire packet ends up in */ 1418145516Sdarrenr/* a single buffer, set the FI_COALESCE flag even though fr_coalesce() has */ 1419145516Sdarrenr/* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */ 1420145516Sdarrenr/* and ONLY if the pullup succeeds. */ 1421145516Sdarrenr/* */ 1422145516Sdarrenr/* We assume that 'min' is a pointer to a buffer that is part of the chain */ 1423145516Sdarrenr/* of buffers that starts at *fin->fin_mp. */ 1424145516Sdarrenr/* ------------------------------------------------------------------------ */ 1425145516Sdarrenrvoid *fr_pullup(min, fin, len) 1426145516Sdarrenrmb_t *min; 1427145516Sdarrenrfr_info_t *fin; 1428145516Sdarrenrint len; 1429145516Sdarrenr{ 1430145516Sdarrenr int out = fin->fin_out, dpoff, ipoff; 1431145516Sdarrenr mb_t *m = min; 1432145516Sdarrenr char *ip; 1433145516Sdarrenr 1434145516Sdarrenr if (m == NULL) 1435145516Sdarrenr return NULL; 1436145516Sdarrenr 1437145516Sdarrenr ip = (char *)fin->fin_ip; 1438145516Sdarrenr if ((fin->fin_flx & FI_COALESCE) != 0) 1439145516Sdarrenr return ip; 1440145516Sdarrenr 1441145516Sdarrenr ipoff = fin->fin_ipoff; 1442145516Sdarrenr if (fin->fin_dp != NULL) 1443145516Sdarrenr dpoff = (char *)fin->fin_dp - (char *)ip; 1444145516Sdarrenr else 1445145516Sdarrenr dpoff = 0; 1446145516Sdarrenr 1447145516Sdarrenr if (M_LEN(m) < len) { 1448145516Sdarrenr#ifdef MHLEN 1449145516Sdarrenr /* 1450145516Sdarrenr * Assume that M_PKTHDR is set and just work with what is left 1451145516Sdarrenr * rather than check.. 1452145516Sdarrenr * Should not make any real difference, anyway. 1453145516Sdarrenr */ 1454145516Sdarrenr if (len > MHLEN) 1455145516Sdarrenr#else 1456145516Sdarrenr if (len > MLEN) 1457145516Sdarrenr#endif 1458145516Sdarrenr { 1459145516Sdarrenr#ifdef HAVE_M_PULLDOWN 1460145516Sdarrenr if (m_pulldown(m, 0, len, NULL) == NULL) 1461145516Sdarrenr m = NULL; 1462145516Sdarrenr#else 1463145516Sdarrenr FREE_MB_T(*fin->fin_mp); 1464145516Sdarrenr m = NULL; 1465145516Sdarrenr#endif 1466145516Sdarrenr } else 1467145516Sdarrenr { 1468145516Sdarrenr m = m_pullup(m, len); 1469145516Sdarrenr } 1470145516Sdarrenr *fin->fin_mp = m; 1471145516Sdarrenr if (m == NULL) { 1472172776Sdarrenr fin->fin_m = NULL; 1473145516Sdarrenr ATOMIC_INCL(frstats[out].fr_pull[1]); 1474145516Sdarrenr return NULL; 1475145516Sdarrenr } 1476172776Sdarrenr 1477172776Sdarrenr while (M_LEN(m) == 0) { 1478172776Sdarrenr m = m->m_next; 1479172776Sdarrenr } 1480172776Sdarrenr fin->fin_m = m; 1481145516Sdarrenr ip = MTOD(m, char *) + ipoff; 1482145516Sdarrenr } 1483145516Sdarrenr 1484145516Sdarrenr ATOMIC_INCL(frstats[out].fr_pull[0]); 1485145516Sdarrenr fin->fin_ip = (ip_t *)ip; 1486145516Sdarrenr if (fin->fin_dp != NULL) 1487145516Sdarrenr fin->fin_dp = (char *)fin->fin_ip + dpoff; 1488145516Sdarrenr 1489145516Sdarrenr if (len == fin->fin_plen) 1490145516Sdarrenr fin->fin_flx |= FI_COALESCE; 1491145516Sdarrenr return ip; 1492145516Sdarrenr} 1493170268Sdarrenr 1494170268Sdarrenr 1495170268Sdarrenrint ipf_inject(fin, m) 1496170268Sdarrenrfr_info_t *fin; 1497170268Sdarrenrmb_t *m; 1498170268Sdarrenr{ 1499170268Sdarrenr int error = 0; 1500170268Sdarrenr 1501170268Sdarrenr if (fin->fin_out == 0) { 1502170268Sdarrenr#if (__FreeBSD_version >= 501000) 1503170268Sdarrenr netisr_dispatch(NETISR_IP, m); 1504170268Sdarrenr#else 1505170268Sdarrenr struct ifqueue *ifq; 1506170268Sdarrenr 1507170268Sdarrenr ifq = &ipintrq; 1508170268Sdarrenr 1509170268Sdarrenr# ifdef _IF_QFULL 1510170268Sdarrenr if (_IF_QFULL(ifq)) 1511170268Sdarrenr# else 1512170268Sdarrenr if (IF_QFULL(ifq)) 1513170268Sdarrenr# endif 1514170268Sdarrenr { 1515170268Sdarrenr# ifdef _IF_DROP 1516170268Sdarrenr _IF_DROP(ifq); 1517170268Sdarrenr# else 1518170268Sdarrenr IF_DROP(ifq); 1519170268Sdarrenr# endif 1520170268Sdarrenr FREE_MB_T(m); 1521170268Sdarrenr error = ENOBUFS; 1522170268Sdarrenr } else { 1523170268Sdarrenr IF_ENQUEUE(ifq, m); 1524170268Sdarrenr } 1525170268Sdarrenr#endif 1526170268Sdarrenr } else { 1527173931Sdarrenr fin->fin_ip->ip_len = ntohs(fin->fin_ip->ip_len); 1528173931Sdarrenr fin->fin_ip->ip_off = ntohs(fin->fin_ip->ip_off); 1529170268Sdarrenr#if (__FreeBSD_version >= 470102) 1530170268Sdarrenr error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 1531170268Sdarrenr#else 1532170268Sdarrenr error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL); 1533170268Sdarrenr#endif 1534170268Sdarrenr } 1535170268Sdarrenr 1536170268Sdarrenr return error; 1537170268Sdarrenr} 1538172776Sdarrenr 1539172776Sdarrenrint ipf_pfil_unhook(void) { 1540172776Sdarrenr#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011) 1541172776Sdarrenr# if __FreeBSD_version >= 501108 1542172776Sdarrenr struct pfil_head *ph_inet; 1543172776Sdarrenr# ifdef USE_INET6 1544172776Sdarrenr struct pfil_head *ph_inet6; 1545172776Sdarrenr# endif 1546172776Sdarrenr# endif 1547172776Sdarrenr#endif 1548172776Sdarrenr 1549172776Sdarrenr#ifdef NETBSD_PF 1550172776Sdarrenr# if (__FreeBSD_version >= 500011) 1551172776Sdarrenr# if (__FreeBSD_version >= 501108) 1552172776Sdarrenr ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); 1553172776Sdarrenr if (ph_inet != NULL) 1554172776Sdarrenr pfil_remove_hook((void *)fr_check_wrapper, NULL, 1555172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet); 1556172776Sdarrenr# else 1557172776Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1558172776Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 1559172776Sdarrenr# endif 1560172776Sdarrenr# else 1561172776Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK); 1562172776Sdarrenr# endif 1563172776Sdarrenr# ifdef USE_INET6 1564172776Sdarrenr# if (__FreeBSD_version >= 501108) 1565172776Sdarrenr ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); 1566172776Sdarrenr if (ph_inet6 != NULL) 1567172776Sdarrenr pfil_remove_hook((void *)fr_check_wrapper6, NULL, 1568172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet6); 1569172776Sdarrenr# else 1570172776Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1571172776Sdarrenr &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 1572172776Sdarrenr# endif 1573172776Sdarrenr# endif 1574172776Sdarrenr#endif 1575172776Sdarrenr 1576172776Sdarrenr return (0); 1577172776Sdarrenr} 1578172776Sdarrenr 1579172776Sdarrenrint ipf_pfil_hook(void) { 1580172776Sdarrenr#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011) 1581172776Sdarrenr# if __FreeBSD_version >= 501108 1582172776Sdarrenr struct pfil_head *ph_inet; 1583172776Sdarrenr# ifdef USE_INET6 1584172776Sdarrenr struct pfil_head *ph_inet6; 1585172776Sdarrenr# endif 1586172776Sdarrenr# endif 1587172776Sdarrenr#endif 1588172776Sdarrenr 1589172776Sdarrenr# ifdef NETBSD_PF 1590172776Sdarrenr# if __FreeBSD_version >= 500011 1591172776Sdarrenr# if __FreeBSD_version >= 501108 1592172776Sdarrenr ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); 1593172776Sdarrenr# ifdef USE_INET6 1594172776Sdarrenr ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); 1595172776Sdarrenr# endif 1596172776Sdarrenr if (ph_inet == NULL 1597172776Sdarrenr# ifdef USE_INET6 1598172776Sdarrenr && ph_inet6 == NULL 1599172776Sdarrenr# endif 1600172776Sdarrenr ) 1601172776Sdarrenr return ENODEV; 1602172776Sdarrenr 1603172776Sdarrenr if (ph_inet != NULL) 1604172776Sdarrenr pfil_add_hook((void *)fr_check_wrapper, NULL, 1605172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet); 1606172776Sdarrenr# else 1607172776Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1608172776Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 1609172776Sdarrenr# endif 1610172776Sdarrenr# else 1611172776Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK); 1612172776Sdarrenr# endif 1613172776Sdarrenr# ifdef USE_INET6 1614172776Sdarrenr# if __FreeBSD_version >= 501108 1615172776Sdarrenr if (ph_inet6 != NULL) 1616172776Sdarrenr pfil_add_hook((void *)fr_check_wrapper6, NULL, 1617172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet6); 1618172776Sdarrenr# else 1619172776Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1620172776Sdarrenr &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 1621172776Sdarrenr# endif 1622172776Sdarrenr# endif 1623172776Sdarrenr# endif 1624172776Sdarrenr return (0); 1625172776Sdarrenr} 1626172776Sdarrenr 1627172776Sdarrenrvoid 1628172776Sdarrenripf_event_reg(void) 1629172776Sdarrenr{ 1630172776Sdarrenr#if (__FreeBSD_version >= 502103) 1631172776Sdarrenr ipf_arrivetag = EVENTHANDLER_REGISTER(ifnet_arrival_event, \ 1632172776Sdarrenr ipf_ifevent, NULL, \ 1633172776Sdarrenr EVENTHANDLER_PRI_ANY); 1634172776Sdarrenr ipf_departtag = EVENTHANDLER_REGISTER(ifnet_departure_event, \ 1635172776Sdarrenr ipf_ifevent, NULL, \ 1636172776Sdarrenr EVENTHANDLER_PRI_ANY); 1637172776Sdarrenr ipf_clonetag = EVENTHANDLER_REGISTER(if_clone_event, ipf_ifevent, \ 1638172776Sdarrenr NULL, EVENTHANDLER_PRI_ANY); 1639172776Sdarrenr#endif 1640172776Sdarrenr} 1641172776Sdarrenr 1642172776Sdarrenrvoid 1643172776Sdarrenripf_event_dereg(void) 1644172776Sdarrenr{ 1645172776Sdarrenr#if (__FreeBSD_version >= 502103) 1646172776Sdarrenr if (ipf_arrivetag != NULL) { 1647172776Sdarrenr EVENTHANDLER_DEREGISTER(ifnet_arrival_event, ipf_arrivetag); 1648172776Sdarrenr } 1649172776Sdarrenr if (ipf_departtag != NULL) { 1650172776Sdarrenr EVENTHANDLER_DEREGISTER(ifnet_departure_event, ipf_departtag); 1651172776Sdarrenr } 1652172776Sdarrenr if (ipf_clonetag != NULL) { 1653172776Sdarrenr EVENTHANDLER_DEREGISTER(if_clone_event, ipf_clonetag); 1654172776Sdarrenr } 1655172776Sdarrenr#endif 1656172776Sdarrenr} 1657