if_pflog.c revision 1.18
1 /* $NetBSD: if_pflog.c,v 1.18 2010/04/12 13:57:38 ahoka 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 (at) tla.org), 6 * Angelos D. Keromytis (kermit (at) csd.uch.gr) and 7 * Niels Provos (provos (at) 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 1.18 2010/04/12 13:57:38 ahoka Exp $"); 40 41 #ifdef _KERNEL_OPT 42 #include "opt_inet.h" 43 #endif 44 45 #include "pflog.h" 46 47 #include <sys/param.h> 48 #include <sys/systm.h> 49 #include <sys/mbuf.h> 50 #include <sys/proc.h> 51 #include <sys/socket.h> 52 #include <sys/ioctl.h> 53 54 #include <net/if.h> 55 #include <net/if_types.h> 56 #include <net/route.h> 57 #include <net/bpf.h> 58 59 #ifdef INET 60 #include <netinet/in.h> 61 #include <netinet/in_var.h> 62 #include <netinet/in_systm.h> 63 #include <netinet/ip.h> 64 #endif 65 66 #ifdef INET6 67 #ifndef INET 68 #include <netinet/in.h> 69 #endif 70 #include <netinet6/nd6.h> 71 #endif /* INET6 */ 72 73 #include <net/pfvar.h> 74 #include <net/if_pflog.h> 75 76 #define PFLOGMTU (32768 + MHLEN + MLEN) 77 78 #ifdef PFLOGDEBUG 79 #define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0) 80 #else 81 #define DPRINTF(x) 82 #endif 83 84 void pflogattach(int); 85 #ifdef _MODULE 86 void pflogdetach(void); 87 #endif /* _MODULE */ 88 int pflogoutput(struct ifnet *, struct mbuf *, const struct sockaddr *, 89 struct rtentry *); 90 int pflogioctl(struct ifnet *, u_long, void *); 91 void pflogstart(struct ifnet *); 92 int pflog_clone_create(struct if_clone *, int); 93 int pflog_clone_destroy(struct ifnet *); 94 95 LIST_HEAD(, pflog_softc) pflogif_list; 96 struct if_clone pflog_cloner = 97 IF_CLONE_INITIALIZER("pflog", pflog_clone_create, pflog_clone_destroy); 98 99 struct ifnet *pflogifs[PFLOGIFS_MAX]; /* for fast access */ 100 101 void 102 pflogattach(int npflog) 103 { 104 int i; 105 106 LIST_INIT(&pflogif_list); 107 for (i = 0; i < PFLOGIFS_MAX; i++) 108 pflogifs[i] = NULL; 109 if_clone_attach(&pflog_cloner); 110 } 111 112 #ifdef _MODULE 113 void 114 pflogdetach(void) 115 { 116 int i; 117 118 for (i = 0; i < PFLOGIFS_MAX; i++) { 119 if (pflogifs[i] != NULL) 120 pflog_clone_destroy(pflogifs[i]); 121 } 122 if_clone_detach(&pflog_cloner); 123 } 124 #endif /* _MODULE */ 125 126 int 127 pflog_clone_create(struct if_clone *ifc, int unit) 128 { 129 struct ifnet *ifp; 130 struct pflog_softc *pflogif; 131 int s; 132 133 if (unit >= PFLOGIFS_MAX) 134 return (EINVAL); 135 136 if ((pflogif = malloc(sizeof(*pflogif), M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL) 137 return (ENOMEM); 138 139 pflogif->sc_unit = unit; 140 ifp = &pflogif->sc_if; 141 snprintf(ifp->if_xname, sizeof ifp->if_xname, "pflog%d", unit); 142 ifp->if_softc = pflogif; 143 ifp->if_mtu = PFLOGMTU; 144 ifp->if_ioctl = pflogioctl; 145 ifp->if_output = pflogoutput; 146 ifp->if_start = pflogstart; 147 ifp->if_type = IFT_PFLOG; 148 #ifndef __NetBSD__ 149 ifp->if_snd.ifq_maxlen = ifqmaxlen; 150 #endif /* !__NetBSD__ */ 151 ifp->if_hdrlen = PFLOG_HDRLEN; 152 if_attach(ifp); 153 if_alloc_sadl(ifp); 154 155 #ifdef __NetBSD__ 156 bpf_attach(ifp, DLT_PFLOG, PFLOG_HDRLEN); 157 #else 158 bpfattach(&pflogif->sc_if.if_bpf, ifp, DLT_PFLOG, PFLOG_HDRLEN); 159 #endif /* !__NetBSD__ */ 160 161 s = splnet(); 162 LIST_INSERT_HEAD(&pflogif_list, pflogif, sc_list); 163 pflogifs[unit] = ifp; 164 splx(s); 165 166 return (0); 167 } 168 169 int 170 pflog_clone_destroy(struct ifnet *ifp) 171 { 172 struct pflog_softc *pflogif = ifp->if_softc; 173 int s; 174 175 s = splnet(); 176 pflogifs[pflogif->sc_unit] = NULL; 177 LIST_REMOVE(pflogif, sc_list); 178 splx(s); 179 180 bpf_detach(ifp); 181 if_detach(ifp); 182 free(pflogif, M_DEVBUF); 183 return (0); 184 } 185 186 /* 187 * Start output on the pflog interface. 188 */ 189 void 190 pflogstart(struct ifnet *ifp) 191 { 192 struct mbuf *m; 193 int s; 194 195 for (;;) { 196 s = splnet(); 197 IF_DROP(&ifp->if_snd); 198 IF_DEQUEUE(&ifp->if_snd, m); 199 splx(s); 200 201 if (m == NULL) 202 return; 203 else 204 m_freem(m); 205 } 206 } 207 208 int 209 pflogoutput(struct ifnet *ifp, struct mbuf *m, 210 const struct sockaddr *dst, struct rtentry *rt) 211 { 212 m_freem(m); 213 return (0); 214 } 215 216 /* ARGSUSED */ 217 int 218 pflogioctl(struct ifnet *ifp, u_long cmd, void *data) 219 { 220 int error = 0; 221 222 switch (cmd) { 223 case SIOCSIFFLAGS: 224 if ((error = ifioctl_common(ifp, cmd, data)) != 0) 225 break; 226 /*FALLTHROUGH*/ 227 case SIOCINITIFADDR: 228 case SIOCAIFADDR: 229 case SIOCSIFDSTADDR: 230 if (ifp->if_flags & IFF_UP) 231 ifp->if_flags |= IFF_RUNNING; 232 else 233 ifp->if_flags &= ~IFF_RUNNING; 234 break; 235 default: 236 error = ifioctl_common(ifp, cmd, data); 237 } 238 239 return error; 240 } 241 242 int 243 pflog_packet(struct pfi_kif *kif, struct mbuf *m, sa_family_t af, u_int8_t dir, 244 u_int8_t reason, struct pf_rule *rm, struct pf_rule *am, 245 struct pf_ruleset *ruleset, struct pf_pdesc *pd) 246 { 247 struct ifnet *ifn; 248 struct pfloghdr hdr; 249 250 if (kif == NULL || m == NULL || rm == NULL || pd == NULL) 251 return (-1); 252 253 if ((ifn = pflogifs[rm->logif]) == NULL || !ifn->if_bpf) 254 return (0); 255 256 bzero(&hdr, sizeof(hdr)); 257 hdr.length = PFLOG_REAL_HDRLEN; 258 hdr.af = af; 259 hdr.action = rm->action; 260 hdr.reason = reason; 261 memcpy(hdr.ifname, kif->pfik_name, sizeof(hdr.ifname)); 262 263 if (am == NULL) { 264 hdr.rulenr = htonl(rm->nr); 265 hdr.subrulenr = -1; 266 } else { 267 hdr.rulenr = htonl(am->nr); 268 hdr.subrulenr = htonl(rm->nr); 269 if (ruleset != NULL && ruleset->anchor != NULL) 270 strlcpy(hdr.ruleset, ruleset->anchor->name, 271 sizeof(hdr.ruleset)); 272 } 273 if (rm->log & PF_LOG_SOCKET_LOOKUP && !pd->lookup.done) 274 pd->lookup.done = pf_socket_lookup(dir, pd); 275 if (pd->lookup.done > 0) { 276 hdr.uid = pd->lookup.uid; 277 hdr.pid = pd->lookup.pid; 278 } else { 279 hdr.uid = UID_MAX; 280 hdr.pid = NO_PID; 281 } 282 hdr.rule_uid = rm->cuid; 283 hdr.rule_pid = rm->cpid; 284 hdr.dir = dir; 285 286 #ifdef INET 287 if (af == AF_INET && dir == PF_OUT) { 288 struct ip *ip; 289 290 ip = mtod(m, struct ip *); 291 ip->ip_sum = 0; 292 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 293 } 294 #endif /* INET */ 295 296 ifn->if_opackets++; 297 ifn->if_obytes += m->m_pkthdr.len; 298 299 #ifdef __NetBSD__ 300 bpf_mtap2(ifn->if_bpf, &hdr, PFLOG_HDRLEN, m); 301 #else 302 bpf_mtap_hdr(ifn->if_bpf, (char *)&hdr, PFLOG_HDRLEN, m, 303 BPF_DIRECTION_OUT); 304 #endif /* !__NetBSD__ */ 305 306 307 return (0); 308 } 309
Indexes created Wed Sep 24 15:09:51 GMT 2025