2/* $OpenBSD: if_pflog.c,v 1.11 2003/12/31 11:18:25 cedric Exp $ */ 3/* 4 * The authors of this code are John Ioannidis (ji@tla.org), 5 * Angelos D. Keromytis (kermit@csd.uch.gr) and 6 * Niels Provos (provos@physnet.uni-hamburg.de). 7 * 8 * This code was written by John Ioannidis for BSD/OS in Athens, Greece, 9 * in November 1995. 10 * 11 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 12 * by Angelos D. Keromytis. 13 * 14 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 15 * and Niels Provos. 16 * 17 * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis 18 * and Niels Provos. 19 * Copyright (c) 2001, Angelos D. Keromytis, Niels Provos. 20 * 21 * Permission to use, copy, and modify this software with or without fee 22 * is hereby granted, provided that this entire notice is included in 23 * all copies of any software which is or includes a copy or 24 * modification of this software. 25 * You may use this code under the GNU public license if you so wish. Please 26 * contribute changes back to the authors under this freer than GPL license 27 * so that we may further the use of strong encryption without limitations to 28 * all. 29 * 30 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 31 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 32 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 33 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 34 * PURPOSE. 35 */ 36 37#ifdef __FreeBSD__ 38#include "opt_inet.h" 39#include "opt_inet6.h" 40#endif 41 42#ifndef __FreeBSD__ 43#include "bpfilter.h" 44#include "pflog.h" 45#elif __FreeBSD__ >= 5 46#include "opt_bpf.h" 47#include "opt_pf.h" 48#define NBPFILTER DEV_BPF 49#define NPFLOG DEV_PFLOG 50#endif 51 52#include <sys/param.h> 53#include <sys/systm.h> 54#include <sys/mbuf.h> 55#include <sys/socket.h> 56#ifdef __FreeBSD__ 57#include <sys/kernel.h> 58#include <sys/malloc.h> 59#include <sys/module.h> 60#include <sys/sockio.h> 61#else 62#include <sys/ioctl.h> 63#endif 64 65#include <net/if.h>
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69#include <net/if_types.h> 70#include <net/route.h> 71#include <net/bpf.h> 72 73#ifdef INET 74#include <netinet/in.h> 75#include <netinet/in_var.h> 76#include <netinet/in_systm.h> 77#include <netinet/ip.h> 78#endif 79 80#ifdef __FreeBSD__ 81#include <machine/in_cksum.h> 82#endif 83 84#ifdef INET6 85#ifndef INET 86#include <netinet/in.h> 87#endif 88#include <netinet6/nd6.h> 89#endif /* INET6 */ 90 91#include <net/pfvar.h> 92#include <net/if_pflog.h> 93 94#ifdef __FreeBSD__ 95#define PFLOGNAME "pflog" 96#endif 97 98#define PFLOGMTU (32768 + MHLEN + MLEN) 99 100#ifdef PFLOGDEBUG 101#define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0) 102#else 103#define DPRINTF(x) 104#endif 105 106#ifndef __FreeBSD__ 107struct pflog_softc pflogif[NPFLOG]; 108#endif 109 110#ifdef __FreeBSD__ 111static void pflog_clone_destroy(struct ifnet *); 112static int pflog_clone_create(struct if_clone *, int); 113#else 114void pflogattach(int); 115#endif 116int pflogoutput(struct ifnet *, struct mbuf *, struct sockaddr *, 117 struct rtentry *); 118int pflogioctl(struct ifnet *, u_long, caddr_t); 119void pflogrtrequest(int, struct rtentry *, struct sockaddr *); 120void pflogstart(struct ifnet *); 121 122#ifndef __FreeBSD__ 123extern int ifqmaxlen; 124#endif 125 126#ifdef __FreeBSD__ 127static MALLOC_DEFINE(M_PFLOG, PFLOGNAME, "Packet Filter Logging Interface"); 128static LIST_HEAD(pflog_list, pflog_softc) pflog_list;
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130 131static void 132pflog_clone_destroy(struct ifnet *ifp) 133{ 134 struct pflog_softc *sc; 135 136 sc = ifp->if_softc; 137 138 /* 139 * Does we really need this? 140 */ 141 IF_DRAIN(&ifp->if_snd); 142 143 bpfdetach(ifp); 144 if_detach(ifp); 145 LIST_REMOVE(sc, sc_next); 146 free(sc, M_PFLOG); 147} 148 149static int 150pflog_clone_create(struct if_clone *ifc, int unit) 151{ 152 struct pflog_softc *sc; 153 154 MALLOC(sc, struct pflog_softc *, sizeof(*sc), M_PFLOG, M_WAITOK|M_ZERO); 155 156 if_initname(&sc->sc_if, ifc->ifc_name, unit); 157 sc->sc_if.if_mtu = PFLOGMTU; 158 sc->sc_if.if_ioctl = pflogioctl; 159 sc->sc_if.if_output = pflogoutput; 160 sc->sc_if.if_start = pflogstart; 161 sc->sc_if.if_type = IFT_PFLOG; 162 sc->sc_if.if_snd.ifq_maxlen = ifqmaxlen; 163 sc->sc_if.if_hdrlen = PFLOG_HDRLEN; 164 sc->sc_if.if_softc = sc; 165 if_attach(&sc->sc_if); 166 167 LIST_INSERT_HEAD(&pflog_list, sc, sc_next); 168#if NBPFILTER > 0 169 bpfattach(&sc->sc_if, DLT_PFLOG, PFLOG_HDRLEN); 170#endif 171 172 return (0); 173} 174#else /* !__FreeBSD__ */ 175void 176pflogattach(int npflog) 177{ 178 struct ifnet *ifp; 179 int i; 180 181 bzero(pflogif, sizeof(pflogif)); 182 183 for (i = 0; i < NPFLOG; i++) { 184 ifp = &pflogif[i].sc_if; 185 snprintf(ifp->if_xname, sizeof ifp->if_xname, "pflog%d", i); 186 ifp->if_softc = &pflogif[i]; 187 ifp->if_mtu = PFLOGMTU; 188 ifp->if_ioctl = pflogioctl; 189 ifp->if_output = pflogoutput; 190 ifp->if_start = pflogstart; 191 ifp->if_type = IFT_PFLOG; 192 ifp->if_snd.ifq_maxlen = ifqmaxlen; 193 ifp->if_hdrlen = PFLOG_HDRLEN; 194 if_attach(ifp); 195 if_alloc_sadl(ifp); 196 197#if NBPFILTER > 0 198 bpfattach(&pflogif[i].sc_if.if_bpf, ifp, DLT_PFLOG, 199 PFLOG_HDRLEN); 200#endif 201 } 202} 203#endif /* __FreeBSD__ */ 204 205/* 206 * Start output on the pflog interface. 207 */ 208void 209pflogstart(struct ifnet *ifp) 210{ 211 struct mbuf *m; 212#ifndef __FreeBSD__ 213 int s; 214#endif 215 216 for (;;) { 217#ifdef __FreeBSD__ 218 IF_LOCK(&ifp->if_snd); 219 _IF_DROP(&ifp->if_snd); 220 _IF_DEQUEUE(&ifp->if_snd, m); 221 if (m == NULL) { 222 IF_UNLOCK(&ifp->if_snd); 223 return; 224 } 225 else 226 m_freem(m); 227 IF_UNLOCK(&ifp->if_snd); 228#else 229 s = splimp(); 230 IF_DROP(&ifp->if_snd); 231 IF_DEQUEUE(&ifp->if_snd, m); 232 splx(s); 233 if (m == NULL) 234 return; 235 else 236 m_freem(m); 237#endif 238 } 239} 240 241int 242pflogoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, 243 struct rtentry *rt) 244{ 245 m_freem(m); 246 return (0); 247} 248 249/* ARGSUSED */ 250void 251pflogrtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa) 252{ 253 if (rt) 254 rt->rt_rmx.rmx_mtu = PFLOGMTU; 255} 256 257/* ARGSUSED */ 258int 259pflogioctl(struct ifnet *ifp, u_long cmd, caddr_t data) 260{ 261 switch (cmd) { 262 case SIOCSIFADDR: 263 case SIOCAIFADDR: 264 case SIOCSIFDSTADDR: 265 case SIOCSIFFLAGS: 266 if (ifp->if_flags & IFF_UP) 267 ifp->if_flags |= IFF_RUNNING; 268 else 269 ifp->if_flags &= ~IFF_RUNNING; 270 break; 271 default: 272 return (EINVAL); 273 } 274 275 return (0); 276} 277 278int 279pflog_packet(struct pfi_kif *kif, struct mbuf *m, sa_family_t af, u_int8_t dir, 280 u_int8_t reason, struct pf_rule *rm, struct pf_rule *am, 281 struct pf_ruleset *ruleset) 282{ 283#if NBPFILTER > 0 284 struct ifnet *ifn; 285 struct pfloghdr hdr; 286#ifndef __FreeBSD__ 287 struct mbuf m1; 288#endif 289 290 if (kif == NULL || m == NULL || rm == NULL) 291 return (-1); 292 293 bzero(&hdr, sizeof(hdr)); 294 hdr.length = PFLOG_REAL_HDRLEN; 295 hdr.af = af; 296 hdr.action = rm->action; 297 hdr.reason = reason; 298 memcpy(hdr.ifname, kif->pfik_name, sizeof(hdr.ifname)); 299 300 if (am == NULL) { 301 hdr.rulenr = htonl(rm->nr); 302 hdr.subrulenr = -1; 303 } else { 304 hdr.rulenr = htonl(am->nr); 305 hdr.subrulenr = htonl(rm->nr); 306 if (ruleset != NULL) 307 memcpy(hdr.ruleset, ruleset->name, 308 sizeof(hdr.ruleset)); 309 310 311 } 312 hdr.dir = dir; 313 314#ifdef INET 315 if (af == AF_INET && dir == PF_OUT) { 316 struct ip *ip; 317 318 ip = mtod(m, struct ip *); 319 ip->ip_sum = 0; 320 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 321 } 322#endif /* INET */ 323 324#ifndef __FreeBSD__ 325 m1.m_next = m; 326 m1.m_len = PFLOG_HDRLEN; 327 m1.m_data = (char *) &hdr; 328#endif 329 330#ifdef __FreeBSD__ 331 KASSERT((!LIST_EMPTY(&pflog_list)), ("pflog: no interface")); 332 ifn = &LIST_FIRST(&pflog_list)->sc_if; 333 BPF_MTAP2(ifn, &hdr, sizeof(hdr), m); 334#else 335 ifn = &(pflogif[0].sc_if); 336 337 if (ifn->if_bpf) 338 bpf_mtap(ifn->if_bpf, &m1); 339#endif 340#endif 341 342 return (0); 343} 344 345#ifdef __FreeBSD__ 346static int 347pflog_modevent(module_t mod, int type, void *data) 348{ 349 int error = 0; 350 351 switch (type) { 352 case MOD_LOAD: 353 LIST_INIT(&pflog_list); 354 if_clone_attach(&pflog_cloner); 355 break; 356 357 case MOD_UNLOAD: 358 if_clone_detach(&pflog_cloner); 359 while (!LIST_EMPTY(&pflog_list)) 360 pflog_clone_destroy( 361 &LIST_FIRST(&pflog_list)->sc_if); 362 break; 363 364 default: 365 error = EINVAL; 366 break; 367 } 368 369 return error; 370} 371 372static moduledata_t pflog_mod = { 373 "pflog", 374 pflog_modevent, 375 0 376}; 377 378#define PFLOG_MODVER 1 379 380DECLARE_MODULE(pflog, pflog_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); 381MODULE_VERSION(pflog, PFLOG_MODVER); 382#endif /* __FreeBSD__ */
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