1 /* $NetBSD: if_pflog.c,v 1.15 2009/07/28 18:15:26 minskim Exp $ */ 2 /* $OpenBSD: if_pflog.c,v 1.24 2007/05/26 17:13:30 jason Exp $ */ 3 4 /* 5 * The authors of this code are John Ioannidis (ji@tla.org), 6 * Angelos D. Keromytis (kermit@csd.uch.gr) and 7 * Niels Provos (provos@physnet.uni-hamburg.de). 8 * 9 * This code was written by John Ioannidis for BSD/OS in Athens, Greece, 10 * in November 1995. 11 * 12 * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, 13 * by Angelos D. Keromytis. 14 * 15 * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis 16 * and Niels Provos. 17 * 18 * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis 19 * and Niels Provos. 20 * Copyright (c) 2001, Angelos D. Keromytis, Niels Provos. 21 * 22 * Permission to use, copy, and modify this software with or without fee 23 * is hereby granted, provided that this entire notice is included in 24 * all copies of any software which is or includes a copy or 25 * modification of this software. 26 * You may use this code under the GNU public license if you so wish. Please 27 * contribute changes back to the authors under this freer than GPL license 28 * so that we may further the use of strong encryption without limitations to 29 * all. 30 * 31 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR 32 * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY 33 * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE 34 * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR 35 * PURPOSE. 36 */ 37 38 #include <sys/cdefs.h> 39 __KERNEL_RCSID(0, "$NetBSD: if_pflog.c,v 1.15 2009/07/28 18:15:26 minskim Exp $"); 40 41 #ifdef _KERNEL_OPT 42 #include "opt_inet.h" 43 #endif 44 45 #include "bpfilter.h" 46 #include "pflog.h" 47 48 #include <sys/param.h> 49 #include <sys/systm.h> 50 #include <sys/mbuf.h> 51 #include <sys/proc.h> 52 #include <sys/socket.h> 53 #include <sys/ioctl.h> 54 55 #include <net/if.h> 56 #include <net/if_types.h> 57 #include <net/route.h> 58 #include <net/bpf.h> 59 60 #ifdef INET 61 #include <netinet/in.h> 62 #include <netinet/in_var.h> 63 #include <netinet/in_systm.h> 64 #include <netinet/ip.h> 65 #endif 66 67 #ifdef INET6 68 #ifndef INET 69 #include <netinet/in.h> 70 #endif 71 #include <netinet6/nd6.h> 72 #endif /* INET6 */ 73 74 #include <net/pfvar.h> 75 #include <net/if_pflog.h> 76 77 #define PFLOGMTU (32768 + MHLEN + MLEN) 78 79 #ifdef PFLOGDEBUG 80 #define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0) 81 #else 82 #define DPRINTF(x) 83 #endif 84 85 void pflogattach(int); 86 int pflogoutput(struct ifnet *, struct mbuf *, const struct sockaddr *, 87 struct rtentry *); 88 int pflogioctl(struct ifnet *, u_long, void *); 89 void pflogstart(struct ifnet *); 90 int pflog_clone_create(struct if_clone *, int); 91 int pflog_clone_destroy(struct ifnet *); 92 93 LIST_HEAD(, pflog_softc) pflogif_list; 94 struct if_clone pflog_cloner = 95 IF_CLONE_INITIALIZER("pflog", pflog_clone_create, pflog_clone_destroy); 96 97 struct ifnet *pflogifs[PFLOGIFS_MAX]; /* for fast access */ 98 99 void 100 pflogattach(int npflog) 101 { 102 int i; 103 104 LIST_INIT(&pflogif_list); 105 for (i = 0; i < PFLOGIFS_MAX; i++) 106 pflogifs[i] = NULL; 107 if_clone_attach(&pflog_cloner); 108 } 109 110 int 111 pflog_clone_create(struct if_clone *ifc, int unit) 112 { 113 struct ifnet *ifp; 114 struct pflog_softc *pflogif; 115 int s; 116 117 if (unit >= PFLOGIFS_MAX) 118 return (EINVAL); 119 120 if ((pflogif = malloc(sizeof(*pflogif), M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) 121 return (ENOMEM); 122 123 pflogif->sc_unit = unit; 124 ifp = &pflogif->sc_if; 125 snprintf(ifp->if_xname, sizeof ifp->if_xname, "pflog%d", unit); 126 ifp->if_softc = pflogif; 127 ifp->if_mtu = PFLOGMTU; 128 ifp->if_ioctl = pflogioctl; 129 ifp->if_output = pflogoutput; 130 ifp->if_start = pflogstart; 131 ifp->if_type = IFT_PFLOG; 132 #ifndef __NetBSD__ 133 ifp->if_snd.ifq_maxlen = ifqmaxlen; 134 #endif /* !__NetBSD__ */ 135 ifp->if_hdrlen = PFLOG_HDRLEN; 136 if_attach(ifp); 137 if_alloc_sadl(ifp); 138 139 #if NBPFILTER > 0 140 #ifdef __NetBSD__ 141 bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN); 142 #else 143 bpfattach(&pflogif->sc_if.if_bpf, ifp, DLT_PFLOG, PFLOG_HDRLEN); 144 #endif /* !__NetBSD__ */ 145 #endif 146 147 s = splnet(); 148 LIST_INSERT_HEAD(&pflogif_list, pflogif, sc_list); 149 pflogifs[unit] = ifp; 150 splx(s); 151 152 return (0); 153 } 154 155 int 156 pflog_clone_destroy(struct ifnet *ifp) 157 { 158 struct pflog_softc *pflogif = ifp->if_softc; 159 int s; 160 161 s = splnet(); 162 pflogifs[pflogif->sc_unit] = NULL; 163 LIST_REMOVE(pflogif, sc_list); 164 splx(s); 165 166 #if NBPFILTER > 0 167 bpfdetach(ifp); 168 #endif 169 if_detach(ifp); 170 free(pflogif, M_DEVBUF); 171 return (0); 172 } 173 174 /* 175 * Start output on the pflog interface. 176 */ 177 void 178 pflogstart(struct ifnet *ifp) 179 { 180 struct mbuf *m; 181 int s; 182 183 for (;;) { 184 s = splnet(); 185 IF_DROP(&ifp->if_snd); 186 IF_DEQUEUE(&ifp->if_snd, m); 187 splx(s); 188 189 if (m == NULL) 190 return; 191 else 192 m_freem(m); 193 } 194 } 195 196 int 197 pflogoutput(struct ifnet *ifp, struct mbuf *m, 198 const struct sockaddr *dst, struct rtentry *rt) 199 { 200 m_freem(m); 201 return (0); 202 } 203 204 /* ARGSUSED */ 205 int 206 pflogioctl(struct ifnet *ifp, u_long cmd, void *data) 207 { 208 int error = 0; 209 210 switch (cmd) { 211 case SIOCSIFFLAGS: 212 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 213 break; 214 /*FALLTHROUGH*/ 215 case SIOCINITIFADDR: 216 case SIOCAIFADDR: 217 case SIOCSIFDSTADDR: 218 if (ifp->if_flags & IFF_UP) 219 ifp->if_flags |= IFF_RUNNING; 220 else 221 ifp->if_flags &= ~IFF_RUNNING; 222 break; 223 default: 224 error = ifioctl_common(ifp, cmd, data); 225 } 226 227 return error; 228 } 229 230 int 231 pflog_packet(struct pfi_kif *kif, struct mbuf *m, sa_family_t af, u_int8_t dir, 232 u_int8_t reason, struct pf_rule *rm, struct pf_rule *am, 233 struct pf_ruleset *ruleset, struct pf_pdesc *pd) 234 { 235 #if NBPFILTER > 0 236 struct ifnet *ifn; 237 struct pfloghdr hdr; 238 239 if (kif == NULL || m == NULL || rm == NULL || pd == NULL) 240 return (-1); 241 242 if ((ifn = pflogifs[rm->logif]) == NULL || !ifn->if_bpf) 243 return (0); 244 245 bzero(&hdr, sizeof(hdr)); 246 hdr.length = PFLOG_REAL_HDRLEN; 247 hdr.af = af; 248 hdr.action = rm->action; 249 hdr.reason = reason; 250 memcpy(hdr.ifname, kif->pfik_name, sizeof(hdr.ifname)); 251 252 if (am == NULL) { 253 hdr.rulenr = htonl(rm->nr); 254 hdr.subrulenr = -1; 255 } else { 256 hdr.rulenr = htonl(am->nr); 257 hdr.subrulenr = htonl(rm->nr); 258 if (ruleset != NULL && ruleset->anchor != NULL) 259 strlcpy(hdr.ruleset, ruleset->anchor->name, 260 sizeof(hdr.ruleset)); 261 } 262 if (rm->log & PF_LOG_SOCKET_LOOKUP && !pd->lookup.done) 263 pd->lookup.done = pf_socket_lookup(dir, pd); 264 if (pd->lookup.done > 0) { 265 hdr.uid = pd->lookup.uid; 266 hdr.pid = pd->lookup.pid; 267 } else { 268 hdr.uid = UID_MAX; 269 hdr.pid = NO_PID; 270 } 271 hdr.rule_uid = rm->cuid; 272 hdr.rule_pid = rm->cpid; 273 hdr.dir = dir; 274 275 #ifdef INET 276 if (af == AF_INET && dir == PF_OUT) { 277 struct ip *ip; 278 279 ip = mtod(m, struct ip *); 280 ip->ip_sum = 0; 281 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 282 } 283 #endif /* INET */ 284 285 ifn->if_opackets++; 286 ifn->if_obytes += m->m_pkthdr.len; 287 288 #ifdef __NetBSD__ 289 bpf_mtap2(ifn->if_bpf, &hdr, PFLOG_HDRLEN, m); 290 #else 291 bpf_mtap_hdr(ifn->if_bpf, (char *)&hdr, PFLOG_HDRLEN, m, 292 BPF_DIRECTION_OUT); 293 #endif /* !__NetBSD__ */ 294 295 #endif 296 297 return (0); 298 } 299