ip_fil_freebsd.c revision 195699
1145516Sdarrenr/* $FreeBSD: head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c 195699 2009-07-14 22:48:30Z rwatson $ */ 2145516Sdarrenr 3145516Sdarrenr/* 4145516Sdarrenr * Copyright (C) 1993-2003 by Darren Reed. 5145516Sdarrenr * 6145516Sdarrenr * See the IPFILTER.LICENCE file for details on licencing. 7145516Sdarrenr */ 8145516Sdarrenr#if !defined(lint) 9145516Sdarrenrstatic const char sccsid[] = "@(#)ip_fil.c 2.41 6/5/96 (C) 1993-2000 Darren Reed"; 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> 67195699Srwatson# include <netinet/tcp_var.h> 68181803Sbz#else 69181803Sbz#define V_path_mtu_discovery path_mtu_discovery 70181803Sbz#define V_ipforwarding ipforwarding 71181803Sbz#endif 72145516Sdarrenr 73145516Sdarrenr#include <net/if.h> 74145516Sdarrenr#if __FreeBSD_version >= 300000 75145516Sdarrenr# include <net/if_var.h> 76170268Sdarrenr# if __FreeBSD_version >= 500043 77170268Sdarrenr# include <net/netisr.h> 78170268Sdarrenr# endif 79145516Sdarrenr# if !defined(IPFILTER_LKM) 80145516Sdarrenr# include "opt_ipfilter.h" 81145516Sdarrenr# endif 82145516Sdarrenr#endif 83145516Sdarrenr#include <net/route.h> 84145516Sdarrenr#include <netinet/in.h> 85145516Sdarrenr#include <netinet/in_var.h> 86145516Sdarrenr#include <netinet/in_systm.h> 87145516Sdarrenr#include <netinet/ip.h> 88145516Sdarrenr#include <netinet/ip_var.h> 89145516Sdarrenr#include <netinet/tcp.h> 90145516Sdarrenr#if defined(__osf__) 91145516Sdarrenr# include <netinet/tcp_timer.h> 92145516Sdarrenr#endif 93145516Sdarrenr#include <netinet/udp.h> 94145516Sdarrenr#include <netinet/tcpip.h> 95145516Sdarrenr#include <netinet/ip_icmp.h> 96145516Sdarrenr#ifndef _KERNEL 97145516Sdarrenr# include "netinet/ipf.h" 98145516Sdarrenr#endif 99145516Sdarrenr#include "netinet/ip_compat.h" 100145516Sdarrenr#ifdef USE_INET6 101145516Sdarrenr# include <netinet/icmp6.h> 102145516Sdarrenr#endif 103145516Sdarrenr#include "netinet/ip_fil.h" 104145516Sdarrenr#include "netinet/ip_nat.h" 105145516Sdarrenr#include "netinet/ip_frag.h" 106145516Sdarrenr#include "netinet/ip_state.h" 107145516Sdarrenr#include "netinet/ip_proxy.h" 108145516Sdarrenr#include "netinet/ip_auth.h" 109145516Sdarrenr#ifdef IPFILTER_SYNC 110145516Sdarrenr#include "netinet/ip_sync.h" 111145516Sdarrenr#endif 112145516Sdarrenr#ifdef IPFILTER_SCAN 113145516Sdarrenr#include "netinet/ip_scan.h" 114145516Sdarrenr#endif 115145516Sdarrenr#include "netinet/ip_pool.h" 116145516Sdarrenr#if defined(__FreeBSD_version) && (__FreeBSD_version >= 300000) 117145516Sdarrenr# include <sys/malloc.h> 118145516Sdarrenr#endif 119145516Sdarrenr#include <sys/kernel.h> 120145516Sdarrenr#ifdef CSUM_DATA_VALID 121145516Sdarrenr#include <machine/in_cksum.h> 122145516Sdarrenr#endif 123145516Sdarrenrextern int ip_optcopy __P((struct ip *, struct ip *)); 124145516Sdarrenr 125185419Szec#if (__FreeBSD_version > 460000) && (__FreeBSD_version < 800055) 126145516Sdarrenrextern int path_mtu_discovery; 127145516Sdarrenr#endif 128145516Sdarrenr 129145516Sdarrenr# ifdef IPFILTER_M_IPFILTER 130151897SrwatsonMALLOC_DEFINE(M_IPFILTER, "ipfilter", "IP Filter packet filter data structures"); 131145516Sdarrenr# endif 132145516Sdarrenr 133145516Sdarrenr 134145516Sdarrenr#if !defined(__osf__) 135145516Sdarrenrextern struct protosw inetsw[]; 136145516Sdarrenr#endif 137145516Sdarrenr 138145516Sdarrenrstatic int (*fr_savep) __P((ip_t *, int, void *, int, struct mbuf **)); 139145516Sdarrenrstatic int fr_send_ip __P((fr_info_t *, mb_t *, mb_t **)); 140145516Sdarrenr# ifdef USE_MUTEXES 141145516Sdarrenripfmutex_t ipl_mutex, ipf_authmx, ipf_rw, ipf_stinsert; 142145516Sdarrenripfmutex_t ipf_nat_new, ipf_natio, ipf_timeoutlock; 143170268Sdarrenripfrwlock_t ipf_mutex, ipf_global, ipf_ipidfrag, ipf_frcache, ipf_tokens; 144145516Sdarrenripfrwlock_t ipf_frag, ipf_state, ipf_nat, ipf_natfrag, ipf_auth; 145145516Sdarrenr# endif 146145516Sdarrenrint ipf_locks_done = 0; 147145516Sdarrenr 148145516Sdarrenr#if (__FreeBSD_version >= 300000) 149145516Sdarrenrstruct callout_handle fr_slowtimer_ch; 150145516Sdarrenr#endif 151161356Sguidostruct selinfo ipfselwait[IPL_LOGSIZE]; 152145516Sdarrenr 153145516Sdarrenr#if (__FreeBSD_version >= 500011) 154145516Sdarrenr# include <sys/conf.h> 155145516Sdarrenr# if defined(NETBSD_PF) 156145516Sdarrenr# include <net/pfil.h> 157186436Sbz# if (__FreeBSD_version < 501108) 158186436Sbz# include <netinet/ipprotosw.h> 159186436Sbz# endif 160145516Sdarrenr/* 161145516Sdarrenr * We provide the fr_checkp name just to minimize changes later. 162145516Sdarrenr */ 163145516Sdarrenrint (*fr_checkp) __P((ip_t *ip, int hlen, void *ifp, int out, mb_t **mp)); 164145516Sdarrenr# endif /* NETBSD_PF */ 165145516Sdarrenr#endif /* __FreeBSD_version >= 500011 */ 166145516Sdarrenr 167145516Sdarrenr 168153876Sguido#if (__FreeBSD_version >= 502103) 169153876Sguidostatic eventhandler_tag ipf_arrivetag, ipf_departtag, ipf_clonetag; 170153876Sguido 171153876Sguidostatic void ipf_ifevent(void *arg); 172153876Sguido 173153876Sguidostatic void ipf_ifevent(arg) 174153876Sguidovoid *arg; 175153876Sguido{ 176153876Sguido frsync(NULL); 177153876Sguido} 178153876Sguido#endif 179153876Sguido 180153876Sguido 181145516Sdarrenr#if (__FreeBSD_version >= 501108) && defined(_KERNEL) 182145516Sdarrenr 183145516Sdarrenrstatic int 184145516Sdarrenrfr_check_wrapper(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 185145516Sdarrenr{ 186145516Sdarrenr struct ip *ip = mtod(*mp, struct ip *); 187145516Sdarrenr return fr_check(ip, ip->ip_hl << 2, ifp, (dir == PFIL_OUT), mp); 188145516Sdarrenr} 189145516Sdarrenr 190145516Sdarrenr# ifdef USE_INET6 191145516Sdarrenr# include <netinet/ip6.h> 192145516Sdarrenr 193145516Sdarrenrstatic int 194145516Sdarrenrfr_check_wrapper6(void *arg, struct mbuf **mp, struct ifnet *ifp, int dir) 195145516Sdarrenr{ 196145516Sdarrenr return (fr_check(mtod(*mp, struct ip *), sizeof(struct ip6_hdr), 197145516Sdarrenr ifp, (dir == PFIL_OUT), mp)); 198145516Sdarrenr} 199145516Sdarrenr# endif 200145516Sdarrenr#endif /* __FreeBSD_version >= 501108 */ 201145516Sdarrenr#if defined(IPFILTER_LKM) 202145516Sdarrenrint iplidentify(s) 203145516Sdarrenrchar *s; 204145516Sdarrenr{ 205145516Sdarrenr if (strcmp(s, "ipl") == 0) 206145516Sdarrenr return 1; 207145516Sdarrenr return 0; 208145516Sdarrenr} 209145516Sdarrenr#endif /* IPFILTER_LKM */ 210145516Sdarrenr 211145516Sdarrenr 212170268Sdarrenrint ipfattach() 213145516Sdarrenr{ 214145516Sdarrenr#ifdef USE_SPL 215145516Sdarrenr int s; 216145516Sdarrenr#endif 217145516Sdarrenr 218145516Sdarrenr SPL_NET(s); 219145516Sdarrenr if (fr_running > 0) { 220145516Sdarrenr SPL_X(s); 221145516Sdarrenr return EBUSY; 222145516Sdarrenr } 223145516Sdarrenr 224145516Sdarrenr MUTEX_INIT(&ipf_rw, "ipf rw mutex"); 225145516Sdarrenr MUTEX_INIT(&ipf_timeoutlock, "ipf timeout queue mutex"); 226145516Sdarrenr RWLOCK_INIT(&ipf_ipidfrag, "ipf IP NAT-Frag rwlock"); 227170268Sdarrenr RWLOCK_INIT(&ipf_tokens, "ipf token rwlock"); 228145516Sdarrenr ipf_locks_done = 1; 229145516Sdarrenr 230145516Sdarrenr if (fr_initialise() < 0) { 231145516Sdarrenr SPL_X(s); 232145516Sdarrenr return EIO; 233145516Sdarrenr } 234145516Sdarrenr 235145516Sdarrenr 236145516Sdarrenr if (fr_checkp != fr_check) { 237145516Sdarrenr fr_savep = fr_checkp; 238145516Sdarrenr fr_checkp = fr_check; 239145516Sdarrenr } 240145516Sdarrenr 241161356Sguido bzero((char *)ipfselwait, sizeof(ipfselwait)); 242145516Sdarrenr bzero((char *)frcache, sizeof(frcache)); 243145516Sdarrenr fr_running = 1; 244145516Sdarrenr 245145516Sdarrenr if (fr_control_forwarding & 1) 246181803Sbz V_ipforwarding = 1; 247145516Sdarrenr 248145516Sdarrenr SPL_X(s); 249145516Sdarrenr#if (__FreeBSD_version >= 300000) 250145516Sdarrenr fr_slowtimer_ch = timeout(fr_slowtimer, NULL, 251145516Sdarrenr (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 252145516Sdarrenr#else 253145516Sdarrenr timeout(fr_slowtimer, NULL, (hz / IPF_HZ_DIVIDE) * IPF_HZ_MULT); 254145516Sdarrenr#endif 255145516Sdarrenr return 0; 256145516Sdarrenr} 257145516Sdarrenr 258145516Sdarrenr 259145516Sdarrenr/* 260145516Sdarrenr * Disable the filter by removing the hooks from the IP input/output 261145516Sdarrenr * stream. 262145516Sdarrenr */ 263170268Sdarrenrint ipfdetach() 264145516Sdarrenr{ 265145516Sdarrenr#ifdef USE_SPL 266145516Sdarrenr int s; 267145516Sdarrenr#endif 268145516Sdarrenr if (fr_control_forwarding & 2) 269181803Sbz V_ipforwarding = 0; 270145516Sdarrenr 271145516Sdarrenr SPL_NET(s); 272145516Sdarrenr 273145516Sdarrenr#if (__FreeBSD_version >= 300000) 274145516Sdarrenr if (fr_slowtimer_ch.callout != NULL) 275145516Sdarrenr untimeout(fr_slowtimer, NULL, fr_slowtimer_ch); 276145516Sdarrenr bzero(&fr_slowtimer_ch, sizeof(fr_slowtimer_ch)); 277145516Sdarrenr#else 278145516Sdarrenr untimeout(fr_slowtimer, NULL); 279145516Sdarrenr#endif /* FreeBSD */ 280145516Sdarrenr 281145516Sdarrenr#ifndef NETBSD_PF 282145516Sdarrenr if (fr_checkp != NULL) 283145516Sdarrenr fr_checkp = fr_savep; 284145516Sdarrenr fr_savep = NULL; 285145516Sdarrenr#endif 286145516Sdarrenr 287145516Sdarrenr fr_deinitialise(); 288145516Sdarrenr 289145516Sdarrenr fr_running = -2; 290145516Sdarrenr 291145516Sdarrenr (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE|FR_INACTIVE); 292145516Sdarrenr (void) frflush(IPL_LOGIPF, 0, FR_INQUE|FR_OUTQUE); 293145516Sdarrenr 294145516Sdarrenr if (ipf_locks_done == 1) { 295145516Sdarrenr MUTEX_DESTROY(&ipf_timeoutlock); 296145516Sdarrenr MUTEX_DESTROY(&ipf_rw); 297145516Sdarrenr RW_DESTROY(&ipf_ipidfrag); 298170268Sdarrenr RW_DESTROY(&ipf_tokens); 299145516Sdarrenr ipf_locks_done = 0; 300145516Sdarrenr } 301145516Sdarrenr 302145516Sdarrenr SPL_X(s); 303145516Sdarrenr 304145516Sdarrenr return 0; 305145516Sdarrenr} 306145516Sdarrenr 307145516Sdarrenr 308145516Sdarrenr/* 309145516Sdarrenr * Filter ioctl interface. 310145516Sdarrenr */ 311145516Sdarrenrint iplioctl(dev, cmd, data, mode 312145516Sdarrenr# if defined(_KERNEL) && ((BSD >= 199506) || (__FreeBSD_version >= 220000)) 313145516Sdarrenr, p) 314145516Sdarrenr# if (__FreeBSD_version >= 500024) 315145516Sdarrenrstruct thread *p; 316170268Sdarrenr# if (__FreeBSD_version >= 500043) 317192895Sjamie# define p_cred td_ucred 318170268Sdarrenr# define p_uid td_ucred->cr_ruid 319170268Sdarrenr# else 320192895Sjamie# define p_cred t_proc->p_cred 321170268Sdarrenr# define p_uid t_proc->p_cred->p_ruid 322170268Sdarrenr# endif 323145516Sdarrenr# else 324145516Sdarrenrstruct proc *p; 325170268Sdarrenr# define p_uid p_cred->p_ruid 326145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 327145516Sdarrenr# else 328145516Sdarrenr) 329145516Sdarrenr# endif 330145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 331145516Sdarrenrstruct cdev *dev; 332145516Sdarrenr#else 333145516Sdarrenrdev_t dev; 334145516Sdarrenr#endif 335145516Sdarrenrioctlcmd_t cmd; 336145516Sdarrenrcaddr_t data; 337145516Sdarrenrint mode; 338145516Sdarrenr{ 339170268Sdarrenr int error = 0, unit = 0; 340170268Sdarrenr SPL_INT(s); 341145516Sdarrenr 342145516Sdarrenr#if (BSD >= 199306) && defined(_KERNEL) 343192895Sjamie# if (__FreeBSD_version >= 500034) 344192895Sjamie if (securelevel_ge(p->p_cred, 3) && (mode & FWRITE)) 345192895Sjamie# else 346153876Sguido if ((securelevel >= 3) && (mode & FWRITE)) 347192895Sjamie# endif 348145516Sdarrenr return EPERM; 349145516Sdarrenr#endif 350145516Sdarrenr 351145516Sdarrenr unit = GET_MINOR(dev); 352145516Sdarrenr if ((IPL_LOGMAX < unit) || (unit < 0)) 353145516Sdarrenr return ENXIO; 354145516Sdarrenr 355145516Sdarrenr if (fr_running <= 0) { 356145516Sdarrenr if (unit != IPL_LOGIPF) 357145516Sdarrenr return EIO; 358145516Sdarrenr if (cmd != SIOCIPFGETNEXT && cmd != SIOCIPFGET && 359173181Sdarrenr cmd != SIOCIPFSET && cmd != SIOCFRENB && 360145516Sdarrenr cmd != SIOCGETFS && cmd != SIOCGETFF) 361145516Sdarrenr return EIO; 362145516Sdarrenr } 363145516Sdarrenr 364145516Sdarrenr SPL_NET(s); 365145516Sdarrenr 366170268Sdarrenr error = fr_ioctlswitch(unit, data, cmd, mode, p->p_uid, p); 367145516Sdarrenr if (error != -1) { 368145516Sdarrenr SPL_X(s); 369145516Sdarrenr return error; 370145516Sdarrenr } 371145516Sdarrenr 372145516Sdarrenr SPL_X(s); 373161356Sguido 374145516Sdarrenr return error; 375145516Sdarrenr} 376145516Sdarrenr 377145516Sdarrenr 378145516Sdarrenr#if 0 379145516Sdarrenrvoid fr_forgetifp(ifp) 380145516Sdarrenrvoid *ifp; 381145516Sdarrenr{ 382145516Sdarrenr register frentry_t *f; 383145516Sdarrenr 384145516Sdarrenr WRITE_ENTER(&ipf_mutex); 385145516Sdarrenr for (f = ipacct[0][fr_active]; (f != NULL); f = f->fr_next) 386145516Sdarrenr if (f->fr_ifa == ifp) 387145516Sdarrenr f->fr_ifa = (void *)-1; 388145516Sdarrenr for (f = ipacct[1][fr_active]; (f != NULL); f = f->fr_next) 389145516Sdarrenr if (f->fr_ifa == ifp) 390145516Sdarrenr f->fr_ifa = (void *)-1; 391145516Sdarrenr for (f = ipfilter[0][fr_active]; (f != NULL); f = f->fr_next) 392145516Sdarrenr if (f->fr_ifa == ifp) 393145516Sdarrenr f->fr_ifa = (void *)-1; 394145516Sdarrenr for (f = ipfilter[1][fr_active]; (f != NULL); f = f->fr_next) 395145516Sdarrenr if (f->fr_ifa == ifp) 396145516Sdarrenr f->fr_ifa = (void *)-1; 397145516Sdarrenr#ifdef USE_INET6 398145516Sdarrenr for (f = ipacct6[0][fr_active]; (f != NULL); f = f->fr_next) 399145516Sdarrenr if (f->fr_ifa == ifp) 400145516Sdarrenr f->fr_ifa = (void *)-1; 401145516Sdarrenr for (f = ipacct6[1][fr_active]; (f != NULL); f = f->fr_next) 402145516Sdarrenr if (f->fr_ifa == ifp) 403145516Sdarrenr f->fr_ifa = (void *)-1; 404145516Sdarrenr for (f = ipfilter6[0][fr_active]; (f != NULL); f = f->fr_next) 405145516Sdarrenr if (f->fr_ifa == ifp) 406145516Sdarrenr f->fr_ifa = (void *)-1; 407145516Sdarrenr for (f = ipfilter6[1][fr_active]; (f != NULL); f = f->fr_next) 408145516Sdarrenr if (f->fr_ifa == ifp) 409145516Sdarrenr f->fr_ifa = (void *)-1; 410145516Sdarrenr#endif 411145516Sdarrenr RWLOCK_EXIT(&ipf_mutex); 412145516Sdarrenr fr_natsync(ifp); 413145516Sdarrenr} 414145516Sdarrenr#endif 415145516Sdarrenr 416145516Sdarrenr 417145516Sdarrenr/* 418145516Sdarrenr * routines below for saving IP headers to buffer 419145516Sdarrenr */ 420145516Sdarrenrint iplopen(dev, flags 421145516Sdarrenr#if ((BSD >= 199506) || (__FreeBSD_version >= 220000)) && defined(_KERNEL) 422145516Sdarrenr, devtype, p) 423145516Sdarrenrint devtype; 424145516Sdarrenr# if (__FreeBSD_version >= 500024) 425145516Sdarrenrstruct thread *p; 426145516Sdarrenr# else 427145516Sdarrenrstruct proc *p; 428145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 429145516Sdarrenr#else 430145516Sdarrenr) 431145516Sdarrenr#endif 432145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 433145516Sdarrenrstruct cdev *dev; 434145516Sdarrenr#else 435145516Sdarrenrdev_t dev; 436145516Sdarrenr#endif 437145516Sdarrenrint flags; 438145516Sdarrenr{ 439145516Sdarrenr u_int min = GET_MINOR(dev); 440145516Sdarrenr 441145516Sdarrenr if (IPL_LOGMAX < min) 442145516Sdarrenr min = ENXIO; 443145516Sdarrenr else 444145516Sdarrenr min = 0; 445145516Sdarrenr return min; 446145516Sdarrenr} 447145516Sdarrenr 448145516Sdarrenr 449145516Sdarrenrint iplclose(dev, flags 450145516Sdarrenr#if ((BSD >= 199506) || (__FreeBSD_version >= 220000)) && defined(_KERNEL) 451145516Sdarrenr, devtype, p) 452145516Sdarrenrint devtype; 453145516Sdarrenr# if (__FreeBSD_version >= 500024) 454145516Sdarrenrstruct thread *p; 455145516Sdarrenr# else 456145516Sdarrenrstruct proc *p; 457145516Sdarrenr# endif /* __FreeBSD_version >= 500024 */ 458145516Sdarrenr#else 459145516Sdarrenr) 460145516Sdarrenr#endif 461145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 462145516Sdarrenrstruct cdev *dev; 463145516Sdarrenr#else 464145516Sdarrenrdev_t dev; 465145516Sdarrenr#endif 466145516Sdarrenrint flags; 467145516Sdarrenr{ 468145516Sdarrenr u_int min = GET_MINOR(dev); 469145516Sdarrenr 470145516Sdarrenr if (IPL_LOGMAX < min) 471145516Sdarrenr min = ENXIO; 472145516Sdarrenr else 473145516Sdarrenr min = 0; 474145516Sdarrenr return min; 475145516Sdarrenr} 476145516Sdarrenr 477145516Sdarrenr/* 478145516Sdarrenr * iplread/ipllog 479145516Sdarrenr * both of these must operate with at least splnet() lest they be 480145516Sdarrenr * called during packet processing and cause an inconsistancy to appear in 481145516Sdarrenr * the filter lists. 482145516Sdarrenr */ 483145516Sdarrenr#if (BSD >= 199306) 484145516Sdarrenrint iplread(dev, uio, ioflag) 485145516Sdarrenrint ioflag; 486145516Sdarrenr#else 487145516Sdarrenrint iplread(dev, uio) 488145516Sdarrenr#endif 489145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 490145516Sdarrenrstruct cdev *dev; 491145516Sdarrenr#else 492145516Sdarrenrdev_t dev; 493145516Sdarrenr#endif 494145516Sdarrenrregister struct uio *uio; 495145516Sdarrenr{ 496161356Sguido u_int xmin = GET_MINOR(dev); 497145516Sdarrenr 498170268Sdarrenr if (fr_running < 1) 499170268Sdarrenr return EIO; 500170268Sdarrenr 501161356Sguido if (xmin < 0) 502161356Sguido return ENXIO; 503161356Sguido 504145516Sdarrenr# ifdef IPFILTER_SYNC 505161356Sguido if (xmin == IPL_LOGSYNC) 506145516Sdarrenr return ipfsync_read(uio); 507145516Sdarrenr# endif 508145516Sdarrenr 509145516Sdarrenr#ifdef IPFILTER_LOG 510161356Sguido return ipflog_read(xmin, uio); 511145516Sdarrenr#else 512145516Sdarrenr return ENXIO; 513145516Sdarrenr#endif 514145516Sdarrenr} 515145516Sdarrenr 516145516Sdarrenr 517145516Sdarrenr/* 518145516Sdarrenr * iplwrite 519145516Sdarrenr * both of these must operate with at least splnet() lest they be 520145516Sdarrenr * called during packet processing and cause an inconsistancy to appear in 521145516Sdarrenr * the filter lists. 522145516Sdarrenr */ 523145516Sdarrenr#if (BSD >= 199306) 524145516Sdarrenrint iplwrite(dev, uio, ioflag) 525145516Sdarrenrint ioflag; 526145516Sdarrenr#else 527145516Sdarrenrint iplwrite(dev, uio) 528145516Sdarrenr#endif 529145516Sdarrenr#if defined(_KERNEL) && (__FreeBSD_version >= 502116) 530145516Sdarrenrstruct cdev *dev; 531145516Sdarrenr#else 532145516Sdarrenrdev_t dev; 533145516Sdarrenr#endif 534145516Sdarrenrregister struct uio *uio; 535145516Sdarrenr{ 536145516Sdarrenr 537170268Sdarrenr if (fr_running < 1) 538170268Sdarrenr return EIO; 539170268Sdarrenr 540145516Sdarrenr#ifdef IPFILTER_SYNC 541145516Sdarrenr if (GET_MINOR(dev) == IPL_LOGSYNC) 542145516Sdarrenr return ipfsync_write(uio); 543145516Sdarrenr#endif 544145516Sdarrenr return ENXIO; 545145516Sdarrenr} 546145516Sdarrenr 547145516Sdarrenr 548145516Sdarrenr/* 549145516Sdarrenr * fr_send_reset - this could conceivably be a call to tcp_respond(), but that 550145516Sdarrenr * requires a large amount of setting up and isn't any more efficient. 551145516Sdarrenr */ 552145516Sdarrenrint fr_send_reset(fin) 553145516Sdarrenrfr_info_t *fin; 554145516Sdarrenr{ 555145516Sdarrenr struct tcphdr *tcp, *tcp2; 556145516Sdarrenr int tlen = 0, hlen; 557145516Sdarrenr struct mbuf *m; 558145516Sdarrenr#ifdef USE_INET6 559145516Sdarrenr ip6_t *ip6; 560145516Sdarrenr#endif 561145516Sdarrenr ip_t *ip; 562145516Sdarrenr 563145516Sdarrenr tcp = fin->fin_dp; 564145516Sdarrenr if (tcp->th_flags & TH_RST) 565145516Sdarrenr return -1; /* feedback loop */ 566145516Sdarrenr 567145516Sdarrenr if (fr_checkl4sum(fin) == -1) 568145516Sdarrenr return -1; 569145516Sdarrenr 570145516Sdarrenr tlen = fin->fin_dlen - (TCP_OFF(tcp) << 2) + 571145516Sdarrenr ((tcp->th_flags & TH_SYN) ? 1 : 0) + 572145516Sdarrenr ((tcp->th_flags & TH_FIN) ? 1 : 0); 573145516Sdarrenr 574145516Sdarrenr#ifdef USE_INET6 575145516Sdarrenr hlen = (fin->fin_v == 6) ? sizeof(ip6_t) : sizeof(ip_t); 576145516Sdarrenr#else 577145516Sdarrenr hlen = sizeof(ip_t); 578145516Sdarrenr#endif 579145516Sdarrenr#ifdef MGETHDR 580145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 581145516Sdarrenr#else 582145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 583145516Sdarrenr#endif 584145516Sdarrenr if (m == NULL) 585145516Sdarrenr return -1; 586145516Sdarrenr if (sizeof(*tcp2) + hlen > MLEN) { 587145516Sdarrenr MCLGET(m, M_DONTWAIT); 588145516Sdarrenr if ((m->m_flags & M_EXT) == 0) { 589145516Sdarrenr FREE_MB_T(m); 590145516Sdarrenr return -1; 591145516Sdarrenr } 592145516Sdarrenr } 593145516Sdarrenr 594145516Sdarrenr m->m_len = sizeof(*tcp2) + hlen; 595145516Sdarrenr#if (BSD >= 199103) 596145516Sdarrenr m->m_data += max_linkhdr; 597145516Sdarrenr m->m_pkthdr.len = m->m_len; 598145516Sdarrenr m->m_pkthdr.rcvif = (struct ifnet *)0; 599145516Sdarrenr#endif 600145516Sdarrenr ip = mtod(m, struct ip *); 601145516Sdarrenr bzero((char *)ip, hlen); 602145516Sdarrenr#ifdef USE_INET6 603145516Sdarrenr ip6 = (ip6_t *)ip; 604145516Sdarrenr#endif 605145516Sdarrenr tcp2 = (struct tcphdr *)((char *)ip + hlen); 606145516Sdarrenr tcp2->th_sport = tcp->th_dport; 607145516Sdarrenr tcp2->th_dport = tcp->th_sport; 608145516Sdarrenr 609145516Sdarrenr if (tcp->th_flags & TH_ACK) { 610145516Sdarrenr tcp2->th_seq = tcp->th_ack; 611145516Sdarrenr tcp2->th_flags = TH_RST; 612145516Sdarrenr tcp2->th_ack = 0; 613145516Sdarrenr } else { 614145516Sdarrenr tcp2->th_seq = 0; 615145516Sdarrenr tcp2->th_ack = ntohl(tcp->th_seq); 616145516Sdarrenr tcp2->th_ack += tlen; 617145516Sdarrenr tcp2->th_ack = htonl(tcp2->th_ack); 618145516Sdarrenr tcp2->th_flags = TH_RST|TH_ACK; 619145516Sdarrenr } 620145516Sdarrenr TCP_X2_A(tcp2, 0); 621145516Sdarrenr TCP_OFF_A(tcp2, sizeof(*tcp2) >> 2); 622145516Sdarrenr tcp2->th_win = tcp->th_win; 623145516Sdarrenr tcp2->th_sum = 0; 624145516Sdarrenr tcp2->th_urp = 0; 625145516Sdarrenr 626145516Sdarrenr#ifdef USE_INET6 627145516Sdarrenr if (fin->fin_v == 6) { 628145516Sdarrenr ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 629145516Sdarrenr ip6->ip6_plen = htons(sizeof(struct tcphdr)); 630145516Sdarrenr ip6->ip6_nxt = IPPROTO_TCP; 631145516Sdarrenr ip6->ip6_hlim = 0; 632145516Sdarrenr ip6->ip6_src = fin->fin_dst6; 633145516Sdarrenr ip6->ip6_dst = fin->fin_src6; 634145516Sdarrenr tcp2->th_sum = in6_cksum(m, IPPROTO_TCP, 635145516Sdarrenr sizeof(*ip6), sizeof(*tcp2)); 636145516Sdarrenr return fr_send_ip(fin, m, &m); 637145516Sdarrenr } 638145516Sdarrenr#endif 639145516Sdarrenr ip->ip_p = IPPROTO_TCP; 640145516Sdarrenr ip->ip_len = htons(sizeof(struct tcphdr)); 641145516Sdarrenr ip->ip_src.s_addr = fin->fin_daddr; 642145516Sdarrenr ip->ip_dst.s_addr = fin->fin_saddr; 643145516Sdarrenr tcp2->th_sum = in_cksum(m, hlen + sizeof(*tcp2)); 644145516Sdarrenr ip->ip_len = hlen + sizeof(*tcp2); 645145516Sdarrenr return fr_send_ip(fin, m, &m); 646145516Sdarrenr} 647145516Sdarrenr 648145516Sdarrenr 649145516Sdarrenrstatic int fr_send_ip(fin, m, mpp) 650145516Sdarrenrfr_info_t *fin; 651145516Sdarrenrmb_t *m, **mpp; 652145516Sdarrenr{ 653145516Sdarrenr fr_info_t fnew; 654145516Sdarrenr ip_t *ip, *oip; 655145516Sdarrenr int hlen; 656145516Sdarrenr 657145516Sdarrenr ip = mtod(m, ip_t *); 658145516Sdarrenr bzero((char *)&fnew, sizeof(fnew)); 659145516Sdarrenr 660145516Sdarrenr IP_V_A(ip, fin->fin_v); 661145516Sdarrenr switch (fin->fin_v) 662145516Sdarrenr { 663145516Sdarrenr case 4 : 664145516Sdarrenr fnew.fin_v = 4; 665145516Sdarrenr oip = fin->fin_ip; 666145516Sdarrenr IP_HL_A(ip, sizeof(*oip) >> 2); 667145516Sdarrenr ip->ip_tos = oip->ip_tos; 668145516Sdarrenr ip->ip_id = fin->fin_ip->ip_id; 669145516Sdarrenr#if (__FreeBSD_version > 460000) 670181803Sbz ip->ip_off = V_path_mtu_discovery ? IP_DF : 0; 671145516Sdarrenr#else 672145516Sdarrenr ip->ip_off = 0; 673145516Sdarrenr#endif 674181803Sbz ip->ip_ttl = V_ip_defttl; 675145516Sdarrenr ip->ip_sum = 0; 676145516Sdarrenr hlen = sizeof(*oip); 677145516Sdarrenr break; 678145516Sdarrenr#ifdef USE_INET6 679145516Sdarrenr case 6 : 680145516Sdarrenr { 681145516Sdarrenr ip6_t *ip6 = (ip6_t *)ip; 682145516Sdarrenr 683145516Sdarrenr ip6->ip6_vfc = 0x60; 684145516Sdarrenr ip6->ip6_hlim = IPDEFTTL; 685145516Sdarrenr 686145516Sdarrenr fnew.fin_v = 6; 687145516Sdarrenr hlen = sizeof(*ip6); 688145516Sdarrenr break; 689145516Sdarrenr } 690145516Sdarrenr#endif 691145516Sdarrenr default : 692145516Sdarrenr return EINVAL; 693145516Sdarrenr } 694145516Sdarrenr#ifdef IPSEC 695145516Sdarrenr m->m_pkthdr.rcvif = NULL; 696145516Sdarrenr#endif 697145516Sdarrenr 698145516Sdarrenr fnew.fin_ifp = fin->fin_ifp; 699145516Sdarrenr fnew.fin_flx = FI_NOCKSUM; 700145516Sdarrenr fnew.fin_m = m; 701145516Sdarrenr fnew.fin_ip = ip; 702145516Sdarrenr fnew.fin_mp = mpp; 703145516Sdarrenr fnew.fin_hlen = hlen; 704145516Sdarrenr fnew.fin_dp = (char *)ip + hlen; 705145516Sdarrenr (void) fr_makefrip(hlen, ip, &fnew); 706145516Sdarrenr 707145516Sdarrenr return fr_fastroute(m, mpp, &fnew, NULL); 708145516Sdarrenr} 709145516Sdarrenr 710145516Sdarrenr 711145516Sdarrenrint fr_send_icmp_err(type, fin, dst) 712145516Sdarrenrint type; 713145516Sdarrenrfr_info_t *fin; 714145516Sdarrenrint dst; 715145516Sdarrenr{ 716145516Sdarrenr int err, hlen, xtra, iclen, ohlen, avail, code; 717145516Sdarrenr struct in_addr dst4; 718145516Sdarrenr struct icmp *icmp; 719145516Sdarrenr struct mbuf *m; 720145516Sdarrenr void *ifp; 721145516Sdarrenr#ifdef USE_INET6 722145516Sdarrenr ip6_t *ip6; 723145516Sdarrenr struct in6_addr dst6; 724145516Sdarrenr#endif 725145516Sdarrenr ip_t *ip, *ip2; 726145516Sdarrenr 727172776Sdarrenr if ((type < 0) || (type >= ICMP_MAXTYPE)) 728145516Sdarrenr return -1; 729145516Sdarrenr 730145516Sdarrenr code = fin->fin_icode; 731145516Sdarrenr#ifdef USE_INET6 732145516Sdarrenr if ((code < 0) || (code > sizeof(icmptoicmp6unreach)/sizeof(int))) 733145516Sdarrenr return -1; 734145516Sdarrenr#endif 735145516Sdarrenr 736145516Sdarrenr if (fr_checkl4sum(fin) == -1) 737145516Sdarrenr return -1; 738145516Sdarrenr#ifdef MGETHDR 739145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 740145516Sdarrenr#else 741145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 742145516Sdarrenr#endif 743145516Sdarrenr if (m == NULL) 744145516Sdarrenr return -1; 745145516Sdarrenr avail = MHLEN; 746145516Sdarrenr 747145516Sdarrenr xtra = 0; 748145516Sdarrenr hlen = 0; 749145516Sdarrenr ohlen = 0; 750145516Sdarrenr ifp = fin->fin_ifp; 751145516Sdarrenr if (fin->fin_v == 4) { 752145516Sdarrenr if ((fin->fin_p == IPPROTO_ICMP) && 753145516Sdarrenr !(fin->fin_flx & FI_SHORT)) 754145516Sdarrenr switch (ntohs(fin->fin_data[0]) >> 8) 755145516Sdarrenr { 756145516Sdarrenr case ICMP_ECHO : 757145516Sdarrenr case ICMP_TSTAMP : 758145516Sdarrenr case ICMP_IREQ : 759145516Sdarrenr case ICMP_MASKREQ : 760145516Sdarrenr break; 761145516Sdarrenr default : 762145516Sdarrenr FREE_MB_T(m); 763145516Sdarrenr return 0; 764145516Sdarrenr } 765145516Sdarrenr 766145516Sdarrenr if (dst == 0) { 767145516Sdarrenr if (fr_ifpaddr(4, FRI_NORMAL, ifp, 768145516Sdarrenr &dst4, NULL) == -1) { 769145516Sdarrenr FREE_MB_T(m); 770145516Sdarrenr return -1; 771145516Sdarrenr } 772145516Sdarrenr } else 773145516Sdarrenr dst4.s_addr = fin->fin_daddr; 774145516Sdarrenr 775145516Sdarrenr hlen = sizeof(ip_t); 776145516Sdarrenr ohlen = fin->fin_hlen; 777145516Sdarrenr if (fin->fin_hlen < fin->fin_plen) 778145516Sdarrenr xtra = MIN(fin->fin_dlen, 8); 779145516Sdarrenr else 780145516Sdarrenr xtra = 0; 781145516Sdarrenr } 782145516Sdarrenr 783145516Sdarrenr#ifdef USE_INET6 784145516Sdarrenr else if (fin->fin_v == 6) { 785145516Sdarrenr hlen = sizeof(ip6_t); 786145516Sdarrenr ohlen = sizeof(ip6_t); 787145516Sdarrenr type = icmptoicmp6types[type]; 788145516Sdarrenr if (type == ICMP6_DST_UNREACH) 789145516Sdarrenr code = icmptoicmp6unreach[code]; 790145516Sdarrenr 791145516Sdarrenr if (hlen + sizeof(*icmp) + max_linkhdr + 792145516Sdarrenr fin->fin_plen > avail) { 793145516Sdarrenr MCLGET(m, M_DONTWAIT); 794145516Sdarrenr if ((m->m_flags & M_EXT) == 0) { 795145516Sdarrenr FREE_MB_T(m); 796145516Sdarrenr return -1; 797145516Sdarrenr } 798145516Sdarrenr avail = MCLBYTES; 799145516Sdarrenr } 800145516Sdarrenr xtra = MIN(fin->fin_plen, 801145516Sdarrenr avail - hlen - sizeof(*icmp) - max_linkhdr); 802145516Sdarrenr if (dst == 0) { 803145516Sdarrenr if (fr_ifpaddr(6, FRI_NORMAL, ifp, 804145516Sdarrenr (struct in_addr *)&dst6, NULL) == -1) { 805145516Sdarrenr FREE_MB_T(m); 806145516Sdarrenr return -1; 807145516Sdarrenr } 808145516Sdarrenr } else 809145516Sdarrenr dst6 = fin->fin_dst6; 810145516Sdarrenr } 811145516Sdarrenr#endif 812145516Sdarrenr else { 813145516Sdarrenr FREE_MB_T(m); 814145516Sdarrenr return -1; 815145516Sdarrenr } 816145516Sdarrenr 817145516Sdarrenr iclen = hlen + sizeof(*icmp); 818145516Sdarrenr avail -= (max_linkhdr + iclen); 819145516Sdarrenr if (avail < 0) { 820145516Sdarrenr FREE_MB_T(m); 821145516Sdarrenr return -1; 822145516Sdarrenr } 823145516Sdarrenr if (xtra > avail) 824145516Sdarrenr xtra = avail; 825145516Sdarrenr iclen += xtra; 826145516Sdarrenr m->m_data += max_linkhdr; 827145516Sdarrenr m->m_pkthdr.rcvif = (struct ifnet *)0; 828145516Sdarrenr m->m_pkthdr.len = iclen; 829145516Sdarrenr m->m_len = iclen; 830145516Sdarrenr ip = mtod(m, ip_t *); 831145516Sdarrenr icmp = (struct icmp *)((char *)ip + hlen); 832145516Sdarrenr ip2 = (ip_t *)&icmp->icmp_ip; 833145516Sdarrenr 834145516Sdarrenr icmp->icmp_type = type; 835145516Sdarrenr icmp->icmp_code = fin->fin_icode; 836145516Sdarrenr icmp->icmp_cksum = 0; 837145516Sdarrenr#ifdef icmp_nextmtu 838145516Sdarrenr if (type == ICMP_UNREACH && 839145516Sdarrenr fin->fin_icode == ICMP_UNREACH_NEEDFRAG && ifp) 840145516Sdarrenr icmp->icmp_nextmtu = htons(((struct ifnet *)ifp)->if_mtu); 841145516Sdarrenr#endif 842145516Sdarrenr 843145516Sdarrenr bcopy((char *)fin->fin_ip, (char *)ip2, ohlen); 844145516Sdarrenr 845145516Sdarrenr#ifdef USE_INET6 846145516Sdarrenr ip6 = (ip6_t *)ip; 847145516Sdarrenr if (fin->fin_v == 6) { 848145516Sdarrenr ip6->ip6_flow = ((ip6_t *)fin->fin_ip)->ip6_flow; 849145516Sdarrenr ip6->ip6_plen = htons(iclen - hlen); 850145516Sdarrenr ip6->ip6_nxt = IPPROTO_ICMPV6; 851145516Sdarrenr ip6->ip6_hlim = 0; 852145516Sdarrenr ip6->ip6_src = dst6; 853145516Sdarrenr ip6->ip6_dst = fin->fin_src6; 854145516Sdarrenr if (xtra > 0) 855145516Sdarrenr bcopy((char *)fin->fin_ip + ohlen, 856145516Sdarrenr (char *)&icmp->icmp_ip + ohlen, xtra); 857145516Sdarrenr icmp->icmp_cksum = in6_cksum(m, IPPROTO_ICMPV6, 858145516Sdarrenr sizeof(*ip6), iclen - hlen); 859145516Sdarrenr } else 860145516Sdarrenr#endif 861145516Sdarrenr { 862145516Sdarrenr ip2->ip_len = htons(ip2->ip_len); 863145516Sdarrenr ip2->ip_off = htons(ip2->ip_off); 864145516Sdarrenr ip->ip_p = IPPROTO_ICMP; 865145516Sdarrenr ip->ip_src.s_addr = dst4.s_addr; 866145516Sdarrenr ip->ip_dst.s_addr = fin->fin_saddr; 867145516Sdarrenr 868145516Sdarrenr if (xtra > 0) 869145516Sdarrenr bcopy((char *)fin->fin_ip + ohlen, 870145516Sdarrenr (char *)&icmp->icmp_ip + ohlen, xtra); 871145516Sdarrenr icmp->icmp_cksum = ipf_cksum((u_short *)icmp, 872145516Sdarrenr sizeof(*icmp) + 8); 873145516Sdarrenr ip->ip_len = iclen; 874145516Sdarrenr ip->ip_p = IPPROTO_ICMP; 875145516Sdarrenr } 876145516Sdarrenr err = fr_send_ip(fin, m, &m); 877145516Sdarrenr return err; 878145516Sdarrenr} 879145516Sdarrenr 880145516Sdarrenr 881145516Sdarrenr#if !defined(IPFILTER_LKM) && (__FreeBSD_version < 300000) 882145516Sdarrenr# if (BSD < 199306) 883145516Sdarrenrint iplinit __P((void)); 884145516Sdarrenr 885145516Sdarrenrint 886145516Sdarrenr# else 887145516Sdarrenrvoid iplinit __P((void)); 888145516Sdarrenr 889145516Sdarrenrvoid 890145516Sdarrenr# endif 891145516Sdarrenriplinit() 892145516Sdarrenr{ 893170268Sdarrenr if (ipfattach() != 0) 894145516Sdarrenr printf("IP Filter failed to attach\n"); 895145516Sdarrenr ip_init(); 896145516Sdarrenr} 897145516Sdarrenr#endif /* __FreeBSD_version < 300000 */ 898145516Sdarrenr 899145516Sdarrenr 900173181Sdarrenr/* 901173181Sdarrenr * m0 - pointer to mbuf where the IP packet starts 902173181Sdarrenr * mpp - pointer to the mbuf pointer that is the start of the mbuf chain 903173181Sdarrenr */ 904145516Sdarrenrint fr_fastroute(m0, mpp, fin, fdp) 905145516Sdarrenrmb_t *m0, **mpp; 906145516Sdarrenrfr_info_t *fin; 907145516Sdarrenrfrdest_t *fdp; 908145516Sdarrenr{ 909145516Sdarrenr register struct ip *ip, *mhip; 910173181Sdarrenr register struct mbuf *m = *mpp; 911145516Sdarrenr register struct route *ro; 912145516Sdarrenr int len, off, error = 0, hlen, code; 913145516Sdarrenr struct ifnet *ifp, *sifp; 914145516Sdarrenr struct sockaddr_in *dst; 915145516Sdarrenr struct route iproute; 916145516Sdarrenr u_short ip_off; 917145516Sdarrenr frentry_t *fr; 918145516Sdarrenr 919161356Sguido ro = NULL; 920161356Sguido 921145516Sdarrenr#ifdef M_WRITABLE 922145516Sdarrenr /* 923145516Sdarrenr * HOT FIX/KLUDGE: 924145516Sdarrenr * 925145516Sdarrenr * If the mbuf we're about to send is not writable (because of 926145516Sdarrenr * a cluster reference, for example) we'll need to make a copy 927145516Sdarrenr * of it since this routine modifies the contents. 928145516Sdarrenr * 929145516Sdarrenr * If you have non-crappy network hardware that can transmit data 930145516Sdarrenr * from the mbuf, rather than making a copy, this is gonna be a 931145516Sdarrenr * problem. 932145516Sdarrenr */ 933145516Sdarrenr if (M_WRITABLE(m) == 0) { 934161356Sguido m0 = m_dup(m, M_DONTWAIT); 935161356Sguido if (m0 != 0) { 936145516Sdarrenr FREE_MB_T(m); 937145516Sdarrenr m = m0; 938145516Sdarrenr *mpp = m; 939145516Sdarrenr } else { 940145516Sdarrenr error = ENOBUFS; 941145516Sdarrenr FREE_MB_T(m); 942161356Sguido goto done; 943145516Sdarrenr } 944145516Sdarrenr } 945145516Sdarrenr#endif 946145516Sdarrenr 947145516Sdarrenr#ifdef USE_INET6 948145516Sdarrenr if (fin->fin_v == 6) { 949145516Sdarrenr /* 950145516Sdarrenr * currently "to <if>" and "to <if>:ip#" are not supported 951145516Sdarrenr * for IPv6 952145516Sdarrenr */ 953145516Sdarrenr#if (__FreeBSD_version >= 490000) 954145516Sdarrenr return ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL); 955145516Sdarrenr#else 956145516Sdarrenr return ip6_output(m0, NULL, NULL, 0, NULL, NULL); 957145516Sdarrenr#endif 958145516Sdarrenr } 959145516Sdarrenr#endif 960145516Sdarrenr 961145516Sdarrenr hlen = fin->fin_hlen; 962145516Sdarrenr ip = mtod(m0, struct ip *); 963145516Sdarrenr 964145516Sdarrenr /* 965145516Sdarrenr * Route packet. 966145516Sdarrenr */ 967145516Sdarrenr ro = &iproute; 968145516Sdarrenr bzero((caddr_t)ro, sizeof (*ro)); 969145516Sdarrenr dst = (struct sockaddr_in *)&ro->ro_dst; 970145516Sdarrenr dst->sin_family = AF_INET; 971145516Sdarrenr dst->sin_addr = ip->ip_dst; 972145516Sdarrenr 973145516Sdarrenr fr = fin->fin_fr; 974145516Sdarrenr if (fdp != NULL) 975145516Sdarrenr ifp = fdp->fd_ifp; 976145516Sdarrenr else 977145516Sdarrenr ifp = fin->fin_ifp; 978145516Sdarrenr 979145516Sdarrenr if ((ifp == NULL) && (!fr || !(fr->fr_flags & FR_FASTROUTE))) { 980145516Sdarrenr error = -2; 981145516Sdarrenr goto bad; 982145516Sdarrenr } 983145516Sdarrenr 984161356Sguido if ((fdp != NULL) && (fdp->fd_ip.s_addr != 0)) 985161356Sguido dst->sin_addr = fdp->fd_ip; 986145516Sdarrenr 987145516Sdarrenr dst->sin_len = sizeof(*dst); 988178888Sjulian in_rtalloc(ro, 0); 989145516Sdarrenr 990145516Sdarrenr if ((ifp == NULL) && (ro->ro_rt != NULL)) 991145516Sdarrenr ifp = ro->ro_rt->rt_ifp; 992145516Sdarrenr 993145516Sdarrenr if ((ro->ro_rt == NULL) || (ifp == NULL)) { 994145516Sdarrenr if (in_localaddr(ip->ip_dst)) 995145516Sdarrenr error = EHOSTUNREACH; 996145516Sdarrenr else 997145516Sdarrenr error = ENETUNREACH; 998145516Sdarrenr goto bad; 999145516Sdarrenr } 1000145516Sdarrenr if (ro->ro_rt->rt_flags & RTF_GATEWAY) 1001145516Sdarrenr dst = (struct sockaddr_in *)ro->ro_rt->rt_gateway; 1002145516Sdarrenr if (ro->ro_rt) 1003145516Sdarrenr ro->ro_rt->rt_use++; 1004145516Sdarrenr 1005145516Sdarrenr /* 1006145516Sdarrenr * For input packets which are being "fastrouted", they won't 1007145516Sdarrenr * go back through output filtering and miss their chance to get 1008170268Sdarrenr * NAT'd and counted. Duplicated packets aren't considered to be 1009170268Sdarrenr * part of the normal packet stream, so do not NAT them or pass 1010170268Sdarrenr * them through stateful checking, etc. 1011145516Sdarrenr */ 1012170268Sdarrenr if ((fdp != &fr->fr_dif) && (fin->fin_out == 0)) { 1013145516Sdarrenr sifp = fin->fin_ifp; 1014145516Sdarrenr fin->fin_ifp = ifp; 1015145516Sdarrenr fin->fin_out = 1; 1016145516Sdarrenr (void) fr_acctpkt(fin, NULL); 1017145516Sdarrenr fin->fin_fr = NULL; 1018145516Sdarrenr if (!fr || !(fr->fr_flags & FR_RETMASK)) { 1019145516Sdarrenr u_32_t pass; 1020145516Sdarrenr 1021170268Sdarrenr if (fr_checkstate(fin, &pass) != NULL) 1022170268Sdarrenr fr_statederef((ipstate_t **)&fin->fin_state); 1023145516Sdarrenr } 1024145516Sdarrenr 1025145516Sdarrenr switch (fr_checknatout(fin, NULL)) 1026145516Sdarrenr { 1027145516Sdarrenr case 0 : 1028145516Sdarrenr break; 1029145516Sdarrenr case 1 : 1030170268Sdarrenr fr_natderef((nat_t **)&fin->fin_nat); 1031145516Sdarrenr ip->ip_sum = 0; 1032145516Sdarrenr break; 1033145516Sdarrenr case -1 : 1034145516Sdarrenr error = -1; 1035173181Sdarrenr goto bad; 1036145516Sdarrenr break; 1037145516Sdarrenr } 1038145516Sdarrenr 1039145516Sdarrenr fin->fin_ifp = sifp; 1040145516Sdarrenr fin->fin_out = 0; 1041145516Sdarrenr } else 1042145516Sdarrenr ip->ip_sum = 0; 1043145516Sdarrenr /* 1044145516Sdarrenr * If small enough for interface, can just send directly. 1045145516Sdarrenr */ 1046145516Sdarrenr if (ip->ip_len <= ifp->if_mtu) { 1047145516Sdarrenr ip->ip_len = htons(ip->ip_len); 1048145516Sdarrenr ip->ip_off = htons(ip->ip_off); 1049145516Sdarrenr 1050145516Sdarrenr if (!ip->ip_sum) 1051145516Sdarrenr ip->ip_sum = in_cksum(m, hlen); 1052145516Sdarrenr error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, 1053191148Skmacy ro); 1054145516Sdarrenr goto done; 1055145516Sdarrenr } 1056145516Sdarrenr /* 1057145516Sdarrenr * Too large for interface; fragment if possible. 1058145516Sdarrenr * Must be able to put at least 8 bytes per fragment. 1059145516Sdarrenr */ 1060145516Sdarrenr ip_off = ntohs(ip->ip_off); 1061145516Sdarrenr if (ip_off & IP_DF) { 1062145516Sdarrenr error = EMSGSIZE; 1063145516Sdarrenr goto bad; 1064145516Sdarrenr } 1065145516Sdarrenr len = (ifp->if_mtu - hlen) &~ 7; 1066145516Sdarrenr if (len < 8) { 1067145516Sdarrenr error = EMSGSIZE; 1068145516Sdarrenr goto bad; 1069145516Sdarrenr } 1070145516Sdarrenr 1071145516Sdarrenr { 1072145516Sdarrenr int mhlen, firstlen = len; 1073145516Sdarrenr struct mbuf **mnext = &m->m_act; 1074145516Sdarrenr 1075145516Sdarrenr /* 1076145516Sdarrenr * Loop through length of segment after first fragment, 1077145516Sdarrenr * make new header and copy data of each part and link onto chain. 1078145516Sdarrenr */ 1079145516Sdarrenr m0 = m; 1080145516Sdarrenr mhlen = sizeof (struct ip); 1081145516Sdarrenr for (off = hlen + len; off < ip->ip_len; off += len) { 1082145516Sdarrenr#ifdef MGETHDR 1083145516Sdarrenr MGETHDR(m, M_DONTWAIT, MT_HEADER); 1084145516Sdarrenr#else 1085145516Sdarrenr MGET(m, M_DONTWAIT, MT_HEADER); 1086145516Sdarrenr#endif 1087145516Sdarrenr if (m == 0) { 1088145516Sdarrenr m = m0; 1089145516Sdarrenr error = ENOBUFS; 1090145516Sdarrenr goto bad; 1091145516Sdarrenr } 1092145516Sdarrenr m->m_data += max_linkhdr; 1093145516Sdarrenr mhip = mtod(m, struct ip *); 1094145516Sdarrenr bcopy((char *)ip, (char *)mhip, sizeof(*ip)); 1095145516Sdarrenr if (hlen > sizeof (struct ip)) { 1096145516Sdarrenr mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip); 1097145516Sdarrenr IP_HL_A(mhip, mhlen >> 2); 1098145516Sdarrenr } 1099145516Sdarrenr m->m_len = mhlen; 1100145516Sdarrenr mhip->ip_off = ((off - hlen) >> 3) + ip_off; 1101145516Sdarrenr if (off + len >= ip->ip_len) 1102145516Sdarrenr len = ip->ip_len - off; 1103145516Sdarrenr else 1104145516Sdarrenr mhip->ip_off |= IP_MF; 1105145516Sdarrenr mhip->ip_len = htons((u_short)(len + mhlen)); 1106161356Sguido *mnext = m; 1107145516Sdarrenr m->m_next = m_copy(m0, off, len); 1108145516Sdarrenr if (m->m_next == 0) { 1109145516Sdarrenr error = ENOBUFS; /* ??? */ 1110145516Sdarrenr goto sendorfree; 1111145516Sdarrenr } 1112145516Sdarrenr m->m_pkthdr.len = mhlen + len; 1113145516Sdarrenr m->m_pkthdr.rcvif = NULL; 1114145516Sdarrenr mhip->ip_off = htons((u_short)mhip->ip_off); 1115145516Sdarrenr mhip->ip_sum = 0; 1116145516Sdarrenr mhip->ip_sum = in_cksum(m, mhlen); 1117145516Sdarrenr mnext = &m->m_act; 1118145516Sdarrenr } 1119145516Sdarrenr /* 1120145516Sdarrenr * Update first fragment by trimming what's been copied out 1121145516Sdarrenr * and updating header, then send each fragment (in order). 1122145516Sdarrenr */ 1123145516Sdarrenr m_adj(m0, hlen + firstlen - ip->ip_len); 1124145516Sdarrenr ip->ip_len = htons((u_short)(hlen + firstlen)); 1125145516Sdarrenr ip->ip_off = htons((u_short)IP_MF); 1126145516Sdarrenr ip->ip_sum = 0; 1127145516Sdarrenr ip->ip_sum = in_cksum(m0, hlen); 1128145516Sdarrenrsendorfree: 1129145516Sdarrenr for (m = m0; m; m = m0) { 1130145516Sdarrenr m0 = m->m_act; 1131145516Sdarrenr m->m_act = 0; 1132145516Sdarrenr if (error == 0) 1133145516Sdarrenr error = (*ifp->if_output)(ifp, m, 1134191148Skmacy (struct sockaddr *)dst, ro); 1135145516Sdarrenr else 1136145516Sdarrenr FREE_MB_T(m); 1137145516Sdarrenr } 1138145516Sdarrenr } 1139145516Sdarrenrdone: 1140145516Sdarrenr if (!error) 1141145516Sdarrenr fr_frouteok[0]++; 1142145516Sdarrenr else 1143145516Sdarrenr fr_frouteok[1]++; 1144145516Sdarrenr 1145161356Sguido if ((ro != NULL) && (ro->ro_rt != NULL)) { 1146145516Sdarrenr RTFREE(ro->ro_rt); 1147145516Sdarrenr } 1148145516Sdarrenr *mpp = NULL; 1149145516Sdarrenr return 0; 1150145516Sdarrenrbad: 1151145516Sdarrenr if (error == EMSGSIZE) { 1152145516Sdarrenr sifp = fin->fin_ifp; 1153145516Sdarrenr code = fin->fin_icode; 1154145516Sdarrenr fin->fin_icode = ICMP_UNREACH_NEEDFRAG; 1155145516Sdarrenr fin->fin_ifp = ifp; 1156145516Sdarrenr (void) fr_send_icmp_err(ICMP_UNREACH, fin, 1); 1157145516Sdarrenr fin->fin_ifp = sifp; 1158145516Sdarrenr fin->fin_icode = code; 1159145516Sdarrenr } 1160145516Sdarrenr FREE_MB_T(m); 1161145516Sdarrenr goto done; 1162145516Sdarrenr} 1163145516Sdarrenr 1164145516Sdarrenr 1165145516Sdarrenrint fr_verifysrc(fin) 1166145516Sdarrenrfr_info_t *fin; 1167145516Sdarrenr{ 1168145516Sdarrenr struct sockaddr_in *dst; 1169145516Sdarrenr struct route iproute; 1170145516Sdarrenr 1171145516Sdarrenr bzero((char *)&iproute, sizeof(iproute)); 1172145516Sdarrenr dst = (struct sockaddr_in *)&iproute.ro_dst; 1173145516Sdarrenr dst->sin_len = sizeof(*dst); 1174145516Sdarrenr dst->sin_family = AF_INET; 1175145516Sdarrenr dst->sin_addr = fin->fin_src; 1176178888Sjulian in_rtalloc(&iproute, 0); 1177145516Sdarrenr if (iproute.ro_rt == NULL) 1178145516Sdarrenr return 0; 1179145516Sdarrenr return (fin->fin_ifp == iproute.ro_rt->rt_ifp); 1180145516Sdarrenr} 1181145516Sdarrenr 1182145516Sdarrenr 1183145516Sdarrenr/* 1184145516Sdarrenr * return the first IP Address associated with an interface 1185145516Sdarrenr */ 1186145516Sdarrenrint fr_ifpaddr(v, atype, ifptr, inp, inpmask) 1187145516Sdarrenrint v, atype; 1188145516Sdarrenrvoid *ifptr; 1189145516Sdarrenrstruct in_addr *inp, *inpmask; 1190145516Sdarrenr{ 1191145516Sdarrenr#ifdef USE_INET6 1192145516Sdarrenr struct in6_addr *inp6 = NULL; 1193145516Sdarrenr#endif 1194145516Sdarrenr struct sockaddr *sock, *mask; 1195145516Sdarrenr struct sockaddr_in *sin; 1196145516Sdarrenr struct ifaddr *ifa; 1197145516Sdarrenr struct ifnet *ifp; 1198145516Sdarrenr 1199145516Sdarrenr if ((ifptr == NULL) || (ifptr == (void *)-1)) 1200145516Sdarrenr return -1; 1201145516Sdarrenr 1202145516Sdarrenr sin = NULL; 1203145516Sdarrenr ifp = ifptr; 1204145516Sdarrenr 1205145516Sdarrenr if (v == 4) 1206145516Sdarrenr inp->s_addr = 0; 1207145516Sdarrenr#ifdef USE_INET6 1208145516Sdarrenr else if (v == 6) 1209145516Sdarrenr bzero((char *)inp, sizeof(struct in6_addr)); 1210145516Sdarrenr#endif 1211145516Sdarrenr#if (__FreeBSD_version >= 300000) 1212145516Sdarrenr ifa = TAILQ_FIRST(&ifp->if_addrhead); 1213145516Sdarrenr#else 1214145516Sdarrenr ifa = ifp->if_addrlist; 1215145516Sdarrenr#endif /* __FreeBSD_version >= 300000 */ 1216145516Sdarrenr 1217145516Sdarrenr sock = ifa->ifa_addr; 1218145516Sdarrenr while (sock != NULL && ifa != NULL) { 1219145516Sdarrenr sin = (struct sockaddr_in *)sock; 1220145516Sdarrenr if ((v == 4) && (sin->sin_family == AF_INET)) 1221145516Sdarrenr break; 1222145516Sdarrenr#ifdef USE_INET6 1223145516Sdarrenr if ((v == 6) && (sin->sin_family == AF_INET6)) { 1224145516Sdarrenr inp6 = &((struct sockaddr_in6 *)sin)->sin6_addr; 1225145516Sdarrenr if (!IN6_IS_ADDR_LINKLOCAL(inp6) && 1226145516Sdarrenr !IN6_IS_ADDR_LOOPBACK(inp6)) 1227145516Sdarrenr break; 1228145516Sdarrenr } 1229145516Sdarrenr#endif 1230145516Sdarrenr#if (__FreeBSD_version >= 300000) 1231145516Sdarrenr ifa = TAILQ_NEXT(ifa, ifa_link); 1232145516Sdarrenr#else 1233145516Sdarrenr ifa = ifa->ifa_next; 1234145516Sdarrenr#endif /* __FreeBSD_version >= 300000 */ 1235145516Sdarrenr if (ifa != NULL) 1236145516Sdarrenr sock = ifa->ifa_addr; 1237145516Sdarrenr } 1238145516Sdarrenr 1239145516Sdarrenr if (ifa == NULL || sin == NULL) 1240145516Sdarrenr return -1; 1241145516Sdarrenr 1242145516Sdarrenr mask = ifa->ifa_netmask; 1243145516Sdarrenr if (atype == FRI_BROADCAST) 1244145516Sdarrenr sock = ifa->ifa_broadaddr; 1245145516Sdarrenr else if (atype == FRI_PEERADDR) 1246145516Sdarrenr sock = ifa->ifa_dstaddr; 1247145516Sdarrenr 1248161356Sguido if (sock == NULL) 1249161356Sguido return -1; 1250161356Sguido 1251145516Sdarrenr#ifdef USE_INET6 1252145516Sdarrenr if (v == 6) { 1253145516Sdarrenr return fr_ifpfillv6addr(atype, (struct sockaddr_in6 *)sock, 1254145516Sdarrenr (struct sockaddr_in6 *)mask, 1255145516Sdarrenr inp, inpmask); 1256145516Sdarrenr } 1257145516Sdarrenr#endif 1258145516Sdarrenr return fr_ifpfillv4addr(atype, (struct sockaddr_in *)sock, 1259145516Sdarrenr (struct sockaddr_in *)mask, inp, inpmask); 1260145516Sdarrenr} 1261145516Sdarrenr 1262145516Sdarrenr 1263145516Sdarrenru_32_t fr_newisn(fin) 1264145516Sdarrenrfr_info_t *fin; 1265145516Sdarrenr{ 1266145516Sdarrenr u_32_t newiss; 1267145516Sdarrenr#if (__FreeBSD_version >= 400000) 1268145516Sdarrenr newiss = arc4random(); 1269145516Sdarrenr#else 1270145516Sdarrenr static iss_seq_off = 0; 1271145516Sdarrenr u_char hash[16]; 1272145516Sdarrenr MD5_CTX ctx; 1273145516Sdarrenr 1274145516Sdarrenr /* 1275145516Sdarrenr * Compute the base value of the ISS. It is a hash 1276145516Sdarrenr * of (saddr, sport, daddr, dport, secret). 1277145516Sdarrenr */ 1278145516Sdarrenr MD5Init(&ctx); 1279145516Sdarrenr 1280145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_src, 1281145516Sdarrenr sizeof(fin->fin_fi.fi_src)); 1282145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_fi.fi_dst, 1283145516Sdarrenr sizeof(fin->fin_fi.fi_dst)); 1284145516Sdarrenr MD5Update(&ctx, (u_char *) &fin->fin_dat, sizeof(fin->fin_dat)); 1285145516Sdarrenr 1286145516Sdarrenr MD5Update(&ctx, ipf_iss_secret, sizeof(ipf_iss_secret)); 1287145516Sdarrenr 1288145516Sdarrenr MD5Final(hash, &ctx); 1289145516Sdarrenr 1290145516Sdarrenr memcpy(&newiss, hash, sizeof(newiss)); 1291145516Sdarrenr 1292145516Sdarrenr /* 1293145516Sdarrenr * Now increment our "timer", and add it in to 1294145516Sdarrenr * the computed value. 1295145516Sdarrenr * 1296145516Sdarrenr * XXX Use `addin'? 1297145516Sdarrenr * XXX TCP_ISSINCR too large to use? 1298145516Sdarrenr */ 1299145516Sdarrenr iss_seq_off += 0x00010000; 1300145516Sdarrenr newiss += iss_seq_off; 1301145516Sdarrenr#endif 1302145516Sdarrenr return newiss; 1303145516Sdarrenr} 1304145516Sdarrenr 1305145516Sdarrenr 1306145516Sdarrenr/* ------------------------------------------------------------------------ */ 1307145516Sdarrenr/* Function: fr_nextipid */ 1308145516Sdarrenr/* Returns: int - 0 == success, -1 == error (packet should be droppped) */ 1309145516Sdarrenr/* Parameters: fin(I) - pointer to packet information */ 1310145516Sdarrenr/* */ 1311145516Sdarrenr/* Returns the next IPv4 ID to use for this packet. */ 1312145516Sdarrenr/* ------------------------------------------------------------------------ */ 1313145516Sdarrenru_short fr_nextipid(fin) 1314145516Sdarrenrfr_info_t *fin; 1315145516Sdarrenr{ 1316145516Sdarrenr#ifndef RANDOM_IP_ID 1317145516Sdarrenr static u_short ipid = 0; 1318145516Sdarrenr u_short id; 1319145516Sdarrenr 1320145516Sdarrenr MUTEX_ENTER(&ipf_rw); 1321145516Sdarrenr id = ipid++; 1322145516Sdarrenr MUTEX_EXIT(&ipf_rw); 1323145516Sdarrenr#else 1324145516Sdarrenr u_short id; 1325145516Sdarrenr 1326145516Sdarrenr id = ip_randomid(); 1327145516Sdarrenr#endif 1328145516Sdarrenr 1329145516Sdarrenr return id; 1330145516Sdarrenr} 1331145516Sdarrenr 1332145516Sdarrenr 1333145516SdarrenrINLINE void fr_checkv4sum(fin) 1334145516Sdarrenrfr_info_t *fin; 1335145516Sdarrenr{ 1336145516Sdarrenr#ifdef CSUM_DATA_VALID 1337145516Sdarrenr int manual = 0; 1338145516Sdarrenr u_short sum; 1339145516Sdarrenr ip_t *ip; 1340145516Sdarrenr mb_t *m; 1341145516Sdarrenr 1342145516Sdarrenr if ((fin->fin_flx & FI_NOCKSUM) != 0) 1343145516Sdarrenr return; 1344145516Sdarrenr 1345172776Sdarrenr if (fin->fin_cksum != 0) 1346172776Sdarrenr return; 1347172776Sdarrenr 1348145516Sdarrenr m = fin->fin_m; 1349145516Sdarrenr if (m == NULL) { 1350145516Sdarrenr manual = 1; 1351145516Sdarrenr goto skipauto; 1352145516Sdarrenr } 1353145516Sdarrenr ip = fin->fin_ip; 1354145516Sdarrenr 1355145516Sdarrenr if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { 1356145516Sdarrenr if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) 1357145516Sdarrenr sum = m->m_pkthdr.csum_data; 1358145516Sdarrenr else 1359145516Sdarrenr sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, 1360145516Sdarrenr htonl(m->m_pkthdr.csum_data + 1361145516Sdarrenr fin->fin_ip->ip_len + fin->fin_p)); 1362145516Sdarrenr sum ^= 0xffff; 1363172776Sdarrenr if (sum != 0) { 1364145516Sdarrenr fin->fin_flx |= FI_BAD; 1365172776Sdarrenr fin->fin_cksum = -1; 1366172776Sdarrenr } else { 1367172776Sdarrenr fin->fin_cksum = 1; 1368172776Sdarrenr } 1369145516Sdarrenr } else 1370145516Sdarrenr manual = 1; 1371145516Sdarrenrskipauto: 1372145516Sdarrenr# ifdef IPFILTER_CKSUM 1373145516Sdarrenr if (manual != 0) 1374145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1375145516Sdarrenr fin->fin_flx |= FI_BAD; 1376145516Sdarrenr# else 1377145516Sdarrenr ; 1378145516Sdarrenr# endif 1379145516Sdarrenr#else 1380145516Sdarrenr# ifdef IPFILTER_CKSUM 1381145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1382145516Sdarrenr fin->fin_flx |= FI_BAD; 1383145516Sdarrenr# endif 1384145516Sdarrenr#endif 1385145516Sdarrenr} 1386145516Sdarrenr 1387145516Sdarrenr 1388145516Sdarrenr#ifdef USE_INET6 1389145516SdarrenrINLINE void fr_checkv6sum(fin) 1390145516Sdarrenrfr_info_t *fin; 1391145516Sdarrenr{ 1392145516Sdarrenr# ifdef IPFILTER_CKSUM 1393145516Sdarrenr if (fr_checkl4sum(fin) == -1) 1394145516Sdarrenr fin->fin_flx |= FI_BAD; 1395145516Sdarrenr# endif 1396145516Sdarrenr} 1397145516Sdarrenr#endif /* USE_INET6 */ 1398145516Sdarrenr 1399145516Sdarrenr 1400145516Sdarrenrsize_t mbufchainlen(m0) 1401145516Sdarrenrstruct mbuf *m0; 1402145516Sdarrenr{ 1403145516Sdarrenr size_t len; 1404145516Sdarrenr 1405145516Sdarrenr if ((m0->m_flags & M_PKTHDR) != 0) { 1406145516Sdarrenr len = m0->m_pkthdr.len; 1407145516Sdarrenr } else { 1408145516Sdarrenr struct mbuf *m; 1409145516Sdarrenr 1410145516Sdarrenr for (m = m0, len = 0; m != NULL; m = m->m_next) 1411145516Sdarrenr len += m->m_len; 1412145516Sdarrenr } 1413145516Sdarrenr return len; 1414145516Sdarrenr} 1415145516Sdarrenr 1416145516Sdarrenr 1417145516Sdarrenr/* ------------------------------------------------------------------------ */ 1418145516Sdarrenr/* Function: fr_pullup */ 1419145516Sdarrenr/* Returns: NULL == pullup failed, else pointer to protocol header */ 1420145516Sdarrenr/* Parameters: m(I) - pointer to buffer where data packet starts */ 1421145516Sdarrenr/* fin(I) - pointer to packet information */ 1422145516Sdarrenr/* len(I) - number of bytes to pullup */ 1423145516Sdarrenr/* */ 1424145516Sdarrenr/* Attempt to move at least len bytes (from the start of the buffer) into a */ 1425145516Sdarrenr/* single buffer for ease of access. Operating system native functions are */ 1426145516Sdarrenr/* used to manage buffers - if necessary. If the entire packet ends up in */ 1427145516Sdarrenr/* a single buffer, set the FI_COALESCE flag even though fr_coalesce() has */ 1428145516Sdarrenr/* not been called. Both fin_ip and fin_dp are updated before exiting _IF_ */ 1429145516Sdarrenr/* and ONLY if the pullup succeeds. */ 1430145516Sdarrenr/* */ 1431145516Sdarrenr/* We assume that 'min' is a pointer to a buffer that is part of the chain */ 1432145516Sdarrenr/* of buffers that starts at *fin->fin_mp. */ 1433145516Sdarrenr/* ------------------------------------------------------------------------ */ 1434145516Sdarrenrvoid *fr_pullup(min, fin, len) 1435145516Sdarrenrmb_t *min; 1436145516Sdarrenrfr_info_t *fin; 1437145516Sdarrenrint len; 1438145516Sdarrenr{ 1439145516Sdarrenr int out = fin->fin_out, dpoff, ipoff; 1440145516Sdarrenr mb_t *m = min; 1441145516Sdarrenr char *ip; 1442145516Sdarrenr 1443145516Sdarrenr if (m == NULL) 1444145516Sdarrenr return NULL; 1445145516Sdarrenr 1446145516Sdarrenr ip = (char *)fin->fin_ip; 1447145516Sdarrenr if ((fin->fin_flx & FI_COALESCE) != 0) 1448145516Sdarrenr return ip; 1449145516Sdarrenr 1450145516Sdarrenr ipoff = fin->fin_ipoff; 1451145516Sdarrenr if (fin->fin_dp != NULL) 1452145516Sdarrenr dpoff = (char *)fin->fin_dp - (char *)ip; 1453145516Sdarrenr else 1454145516Sdarrenr dpoff = 0; 1455145516Sdarrenr 1456145516Sdarrenr if (M_LEN(m) < len) { 1457145516Sdarrenr#ifdef MHLEN 1458145516Sdarrenr /* 1459145516Sdarrenr * Assume that M_PKTHDR is set and just work with what is left 1460145516Sdarrenr * rather than check.. 1461145516Sdarrenr * Should not make any real difference, anyway. 1462145516Sdarrenr */ 1463145516Sdarrenr if (len > MHLEN) 1464145516Sdarrenr#else 1465145516Sdarrenr if (len > MLEN) 1466145516Sdarrenr#endif 1467145516Sdarrenr { 1468145516Sdarrenr#ifdef HAVE_M_PULLDOWN 1469145516Sdarrenr if (m_pulldown(m, 0, len, NULL) == NULL) 1470145516Sdarrenr m = NULL; 1471145516Sdarrenr#else 1472145516Sdarrenr FREE_MB_T(*fin->fin_mp); 1473145516Sdarrenr m = NULL; 1474145516Sdarrenr#endif 1475145516Sdarrenr } else 1476145516Sdarrenr { 1477145516Sdarrenr m = m_pullup(m, len); 1478145516Sdarrenr } 1479145516Sdarrenr *fin->fin_mp = m; 1480145516Sdarrenr if (m == NULL) { 1481172776Sdarrenr fin->fin_m = NULL; 1482145516Sdarrenr ATOMIC_INCL(frstats[out].fr_pull[1]); 1483145516Sdarrenr return NULL; 1484145516Sdarrenr } 1485172776Sdarrenr 1486172776Sdarrenr while (M_LEN(m) == 0) { 1487172776Sdarrenr m = m->m_next; 1488172776Sdarrenr } 1489172776Sdarrenr fin->fin_m = m; 1490145516Sdarrenr ip = MTOD(m, char *) + ipoff; 1491145516Sdarrenr } 1492145516Sdarrenr 1493145516Sdarrenr ATOMIC_INCL(frstats[out].fr_pull[0]); 1494145516Sdarrenr fin->fin_ip = (ip_t *)ip; 1495145516Sdarrenr if (fin->fin_dp != NULL) 1496145516Sdarrenr fin->fin_dp = (char *)fin->fin_ip + dpoff; 1497145516Sdarrenr 1498145516Sdarrenr if (len == fin->fin_plen) 1499145516Sdarrenr fin->fin_flx |= FI_COALESCE; 1500145516Sdarrenr return ip; 1501145516Sdarrenr} 1502170268Sdarrenr 1503170268Sdarrenr 1504170268Sdarrenrint ipf_inject(fin, m) 1505170268Sdarrenrfr_info_t *fin; 1506170268Sdarrenrmb_t *m; 1507170268Sdarrenr{ 1508170268Sdarrenr int error = 0; 1509170268Sdarrenr 1510170268Sdarrenr if (fin->fin_out == 0) { 1511170268Sdarrenr#if (__FreeBSD_version >= 501000) 1512170268Sdarrenr netisr_dispatch(NETISR_IP, m); 1513170268Sdarrenr#else 1514170268Sdarrenr struct ifqueue *ifq; 1515170268Sdarrenr 1516170268Sdarrenr ifq = &ipintrq; 1517170268Sdarrenr 1518170268Sdarrenr# ifdef _IF_QFULL 1519170268Sdarrenr if (_IF_QFULL(ifq)) 1520170268Sdarrenr# else 1521170268Sdarrenr if (IF_QFULL(ifq)) 1522170268Sdarrenr# endif 1523170268Sdarrenr { 1524170268Sdarrenr# ifdef _IF_DROP 1525170268Sdarrenr _IF_DROP(ifq); 1526170268Sdarrenr# else 1527170268Sdarrenr IF_DROP(ifq); 1528170268Sdarrenr# endif 1529170268Sdarrenr FREE_MB_T(m); 1530170268Sdarrenr error = ENOBUFS; 1531170268Sdarrenr } else { 1532170268Sdarrenr IF_ENQUEUE(ifq, m); 1533170268Sdarrenr } 1534170268Sdarrenr#endif 1535170268Sdarrenr } else { 1536173931Sdarrenr fin->fin_ip->ip_len = ntohs(fin->fin_ip->ip_len); 1537173931Sdarrenr fin->fin_ip->ip_off = ntohs(fin->fin_ip->ip_off); 1538170268Sdarrenr#if (__FreeBSD_version >= 470102) 1539170268Sdarrenr error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL, NULL); 1540170268Sdarrenr#else 1541170268Sdarrenr error = ip_output(m, NULL, NULL, IP_FORWARDING, NULL); 1542170268Sdarrenr#endif 1543170268Sdarrenr } 1544170268Sdarrenr 1545170268Sdarrenr return error; 1546170268Sdarrenr} 1547172776Sdarrenr 1548172776Sdarrenrint ipf_pfil_unhook(void) { 1549172776Sdarrenr#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011) 1550172776Sdarrenr# if __FreeBSD_version >= 501108 1551172776Sdarrenr struct pfil_head *ph_inet; 1552172776Sdarrenr# ifdef USE_INET6 1553172776Sdarrenr struct pfil_head *ph_inet6; 1554172776Sdarrenr# endif 1555172776Sdarrenr# endif 1556172776Sdarrenr#endif 1557172776Sdarrenr 1558172776Sdarrenr#ifdef NETBSD_PF 1559172776Sdarrenr# if (__FreeBSD_version >= 500011) 1560172776Sdarrenr# if (__FreeBSD_version >= 501108) 1561172776Sdarrenr ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); 1562172776Sdarrenr if (ph_inet != NULL) 1563172776Sdarrenr pfil_remove_hook((void *)fr_check_wrapper, NULL, 1564172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet); 1565172776Sdarrenr# else 1566172776Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1567172776Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 1568172776Sdarrenr# endif 1569172776Sdarrenr# else 1570172776Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK); 1571172776Sdarrenr# endif 1572172776Sdarrenr# ifdef USE_INET6 1573172776Sdarrenr# if (__FreeBSD_version >= 501108) 1574172776Sdarrenr ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); 1575172776Sdarrenr if (ph_inet6 != NULL) 1576172776Sdarrenr pfil_remove_hook((void *)fr_check_wrapper6, NULL, 1577172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet6); 1578172776Sdarrenr# else 1579172776Sdarrenr pfil_remove_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1580172776Sdarrenr &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 1581172776Sdarrenr# endif 1582172776Sdarrenr# endif 1583172776Sdarrenr#endif 1584172776Sdarrenr 1585172776Sdarrenr return (0); 1586172776Sdarrenr} 1587172776Sdarrenr 1588172776Sdarrenrint ipf_pfil_hook(void) { 1589172776Sdarrenr#if defined(NETBSD_PF) && (__FreeBSD_version >= 500011) 1590172776Sdarrenr# if __FreeBSD_version >= 501108 1591172776Sdarrenr struct pfil_head *ph_inet; 1592172776Sdarrenr# ifdef USE_INET6 1593172776Sdarrenr struct pfil_head *ph_inet6; 1594172776Sdarrenr# endif 1595172776Sdarrenr# endif 1596172776Sdarrenr#endif 1597172776Sdarrenr 1598172776Sdarrenr# ifdef NETBSD_PF 1599172776Sdarrenr# if __FreeBSD_version >= 500011 1600172776Sdarrenr# if __FreeBSD_version >= 501108 1601172776Sdarrenr ph_inet = pfil_head_get(PFIL_TYPE_AF, AF_INET); 1602172776Sdarrenr# ifdef USE_INET6 1603172776Sdarrenr ph_inet6 = pfil_head_get(PFIL_TYPE_AF, AF_INET6); 1604172776Sdarrenr# endif 1605172776Sdarrenr if (ph_inet == NULL 1606172776Sdarrenr# ifdef USE_INET6 1607172776Sdarrenr && ph_inet6 == NULL 1608172776Sdarrenr# endif 1609172776Sdarrenr ) 1610172776Sdarrenr return ENODEV; 1611172776Sdarrenr 1612172776Sdarrenr if (ph_inet != NULL) 1613172776Sdarrenr pfil_add_hook((void *)fr_check_wrapper, NULL, 1614172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet); 1615172776Sdarrenr# else 1616172776Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1617172776Sdarrenr &inetsw[ip_protox[IPPROTO_IP]].pr_pfh); 1618172776Sdarrenr# endif 1619172776Sdarrenr# else 1620172776Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK); 1621172776Sdarrenr# endif 1622172776Sdarrenr# ifdef USE_INET6 1623172776Sdarrenr# if __FreeBSD_version >= 501108 1624172776Sdarrenr if (ph_inet6 != NULL) 1625172776Sdarrenr pfil_add_hook((void *)fr_check_wrapper6, NULL, 1626172776Sdarrenr PFIL_IN|PFIL_OUT|PFIL_WAITOK, ph_inet6); 1627172776Sdarrenr# else 1628172776Sdarrenr pfil_add_hook((void *)fr_check, PFIL_IN|PFIL_OUT|PFIL_WAITOK, 1629172776Sdarrenr &inet6sw[ip6_protox[IPPROTO_IPV6]].pr_pfh); 1630172776Sdarrenr# endif 1631172776Sdarrenr# endif 1632172776Sdarrenr# endif 1633172776Sdarrenr return (0); 1634172776Sdarrenr} 1635172776Sdarrenr 1636172776Sdarrenrvoid 1637172776Sdarrenripf_event_reg(void) 1638172776Sdarrenr{ 1639172776Sdarrenr#if (__FreeBSD_version >= 502103) 1640172776Sdarrenr ipf_arrivetag = EVENTHANDLER_REGISTER(ifnet_arrival_event, \ 1641172776Sdarrenr ipf_ifevent, NULL, \ 1642172776Sdarrenr EVENTHANDLER_PRI_ANY); 1643172776Sdarrenr ipf_departtag = EVENTHANDLER_REGISTER(ifnet_departure_event, \ 1644172776Sdarrenr ipf_ifevent, NULL, \ 1645172776Sdarrenr EVENTHANDLER_PRI_ANY); 1646172776Sdarrenr ipf_clonetag = EVENTHANDLER_REGISTER(if_clone_event, ipf_ifevent, \ 1647172776Sdarrenr NULL, EVENTHANDLER_PRI_ANY); 1648172776Sdarrenr#endif 1649172776Sdarrenr} 1650172776Sdarrenr 1651172776Sdarrenrvoid 1652172776Sdarrenripf_event_dereg(void) 1653172776Sdarrenr{ 1654172776Sdarrenr#if (__FreeBSD_version >= 502103) 1655172776Sdarrenr if (ipf_arrivetag != NULL) { 1656172776Sdarrenr EVENTHANDLER_DEREGISTER(ifnet_arrival_event, ipf_arrivetag); 1657172776Sdarrenr } 1658172776Sdarrenr if (ipf_departtag != NULL) { 1659172776Sdarrenr EVENTHANDLER_DEREGISTER(ifnet_departure_event, ipf_departtag); 1660172776Sdarrenr } 1661172776Sdarrenr if (ipf_clonetag != NULL) { 1662172776Sdarrenr EVENTHANDLER_DEREGISTER(if_clone_event, ipf_clonetag); 1663172776Sdarrenr } 1664172776Sdarrenr#endif 1665172776Sdarrenr} 1666