/*- * The authors of this code are John Ioannidis (ji@tla.org), * Angelos D. Keromytis (kermit@csd.uch.gr) and * Niels Provos (provos@physnet.uni-hamburg.de). * * This code was written by John Ioannidis for BSD/OS in Athens, Greece, * in November 1995. * * Ported to OpenBSD and NetBSD, with additional transforms, in December 1996, * by Angelos D. Keromytis. * * Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis * and Niels Provos. * * Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis * and Niels Provos. * Copyright (c) 2001, Angelos D. Keromytis, Niels Provos. * * Permission to use, copy, and modify this software with or without fee * is hereby granted, provided that this entire notice is included in * all copies of any software which is or includes a copy or * modification of this software. * You may use this code under the GNU public license if you so wish. Please * contribute changes back to the authors under this freer than GPL license * so that we may further the use of strong encryption without limitations to * all. * * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR * IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY * REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE * MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR * PURPOSE. * * $OpenBSD: if_pflog.c,v 1.26 2007/10/18 21:58:18 mpf Exp $ */ #include __FBSDID("$FreeBSD$"); #include "opt_inet.h" #include "opt_inet6.h" #include "opt_bpf.h" #include "opt_pf.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(INET) || defined(INET6) #include #endif #ifdef INET #include #include #endif #ifdef INET6 #include #include #endif /* INET6 */ #ifdef INET #include #endif /* INET */ #define PFLOGMTU (32768 + MHLEN + MLEN) #ifdef PFLOGDEBUG #define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0) #else #define DPRINTF(x) #endif static int pflogoutput(struct ifnet *, struct mbuf *, const struct sockaddr *, struct route *); static void pflogattach(int); static int pflogioctl(struct ifnet *, u_long, caddr_t); static void pflogstart(struct ifnet *); static int pflog_clone_create(struct if_clone *, int, caddr_t); static void pflog_clone_destroy(struct ifnet *); static struct if_clone *pflog_cloner; static const char pflogname[] = "pflog"; struct ifnet *pflogifs[PFLOGIFS_MAX]; /* for fast access */ static void pflogattach(int npflog) { int i; for (i = 0; i < PFLOGIFS_MAX; i++) pflogifs[i] = NULL; pflog_cloner = if_clone_simple(pflogname, pflog_clone_create, pflog_clone_destroy, 1); } static int pflog_clone_create(struct if_clone *ifc, int unit, caddr_t param) { struct ifnet *ifp; if (unit >= PFLOGIFS_MAX) return (EINVAL); ifp = if_alloc(IFT_PFLOG); if (ifp == NULL) { return (ENOSPC); } if_initname(ifp, pflogname, unit); ifp->if_mtu = PFLOGMTU; ifp->if_ioctl = pflogioctl; ifp->if_output = pflogoutput; ifp->if_start = pflogstart; ifp->if_snd.ifq_maxlen = ifqmaxlen; ifp->if_hdrlen = PFLOG_HDRLEN; if_attach(ifp); bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN); pflogifs[unit] = ifp; return (0); } static void pflog_clone_destroy(struct ifnet *ifp) { int i; for (i = 0; i < PFLOGIFS_MAX; i++) if (pflogifs[i] == ifp) pflogifs[i] = NULL; bpfdetach(ifp); if_detach(ifp); if_free(ifp); } /* * Start output on the pflog interface. */ static void pflogstart(struct ifnet *ifp) { struct mbuf *m; for (;;) { IF_LOCK(&ifp->if_snd); _IF_DROP(&ifp->if_snd); _IF_DEQUEUE(&ifp->if_snd, m); IF_UNLOCK(&ifp->if_snd); if (m == NULL) return; else m_freem(m); } } static int pflogoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, struct route *rt) { m_freem(m); return (0); } /* ARGSUSED */ static int pflogioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { switch (cmd) { case SIOCSIFFLAGS: if (ifp->if_flags & IFF_UP) ifp->if_drv_flags |= IFF_DRV_RUNNING; else ifp->if_drv_flags &= ~IFF_DRV_RUNNING; break; default: return (ENOTTY); } return (0); } static int pflog_packet(struct pfi_kif *kif, struct mbuf *m, sa_family_t af, u_int8_t dir, u_int8_t reason, struct pf_rule *rm, struct pf_rule *am, struct pf_ruleset *ruleset, struct pf_pdesc *pd, int lookupsafe) { struct ifnet *ifn; struct pfloghdr hdr; if (kif == NULL || m == NULL || rm == NULL || pd == NULL) return ( 1); if ((ifn = pflogifs[rm->logif]) == NULL || !ifn->if_bpf) return (0); bzero(&hdr, sizeof(hdr)); hdr.length = PFLOG_HDRLEN; hdr.af = af; hdr.action = rm->action; hdr.reason = reason; memcpy(hdr.ifname, kif->pfik_name, sizeof(hdr.ifname)); if (am == NULL) { hdr.rulenr = htonl(rm->nr); hdr.subrulenr = 1; hdr.ridentifier = rm->cuid; } else { hdr.rulenr = htonl(am->nr); hdr.subrulenr = htonl(rm->nr); hdr.ridentifier = rm->cuid; if (ruleset != NULL && ruleset->anchor != NULL) strlcpy(hdr.ruleset, ruleset->anchor->name, sizeof(hdr.ruleset)); } #ifdef PF_USER_INFO /* * XXXGL: we avoid pf_socket_lookup() when we are holding * state lock, since this leads to unsafe LOR. * These conditions are very very rare, however. */ if (rm->log & PF_LOG_SOCKET_LOOKUP && !pd->lookup.done && lookupsafe) pd->lookup.done = pf_socket_lookup(dir, pd, m); if (pd->lookup.done > 0) hdr.uid = pd->lookup.uid; else hdr.uid = UID_MAX; hdr.pid = NO_PID; hdr.rule_uid = rm->cuid; hdr.rule_pid = rm->cpid; #endif hdr.dir = dir; #ifdef INET if (af == AF_INET && dir == PF_OUT) { struct ip *ip; ip = mtod(m, struct ip *); ip->ip_sum = 0; ip->ip_sum = in_cksum(m, ip->ip_hl << 2); } #endif /* INET */ ifn->if_opackets++; ifn->if_obytes += m->m_pkthdr.len; BPF_MTAP2(ifn, &hdr, PFLOG_HDRLEN, m); return (0); } static int pflog_modevent(module_t mod, int type, void *data) { int error = 0; switch (type) { case MOD_LOAD: pflogattach(1); PF_RULES_WLOCK(); pflog_packet_ptr = pflog_packet; PF_RULES_WUNLOCK(); break; case MOD_UNLOAD: PF_RULES_WLOCK(); pflog_packet_ptr = NULL; PF_RULES_WUNLOCK(); if_clone_detach(pflog_cloner); break; default: error = EINVAL; break; } return error; } static moduledata_t pflog_mod = { pflogname, pflog_modevent, 0 }; #define PFLOG_MODVER 1 DECLARE_MODULE(pflog, pflog_mod, SI_SUB_PSEUDO, SI_ORDER_ANY); MODULE_VERSION(pflog, PFLOG_MODVER); MODULE_DEPEND(pflog, pf, PF_MODVER, PF_MODVER, PF_MODVER);