/* $OpenBSD: if_pflog.c,v 1.11 2003/12/31 11:18:25 cedric Exp $ */ /* * 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. */ #include "bpfilter.h" #include "pflog.h" #include <sys/param.h> #include <sys/systm.h> #include <sys/mbuf.h> #include <sys/socket.h> #include <sys/ioctl.h> #include <net/if.h> #include <net/if_types.h> #include <net/route.h> #include <net/bpf.h> #ifdef INET #include <netinet/in.h> #include <netinet/in_var.h> #include <netinet/in_systm.h> #include <netinet/ip.h> #endif #ifdef INET6 #ifndef INET #include <netinet/in.h> #endif #include <netinet6/nd6.h> #endif /* INET6 */ #include <net/pfvar.h> #include <net/if_pflog.h> #define PFLOGMTU (32768 + MHLEN + MLEN) #ifdef PFLOGDEBUG #define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0) #else #define DPRINTF(x) #endif struct pflog_softc pflogif[NPFLOG]; void pflogattach(int); int pflogoutput(struct ifnet *, struct mbuf *, struct sockaddr *, struct rtentry *); int pflogioctl(struct ifnet *, u_long, caddr_t); void pflogrtrequest(int, struct rtentry *, struct sockaddr *); void pflogstart(struct ifnet *); extern int ifqmaxlen; void pflogattach(int npflog) { struct ifnet *ifp; int i; bzero(pflogif, sizeof(pflogif)); for (i = 0; i < NPFLOG; i++) { ifp = &pflogif[i].sc_if; snprintf(ifp->if_xname, sizeof ifp->if_xname, "pflog%d", i); ifp->if_softc = &pflogif[i]; ifp->if_mtu = PFLOGMTU; ifp->if_ioctl = pflogioctl; ifp->if_output = pflogoutput; ifp->if_start = pflogstart; ifp->if_type = IFT_PFLOG; ifp->if_snd.ifq_maxlen = ifqmaxlen; ifp->if_hdrlen = PFLOG_HDRLEN; if_attach(ifp); if_alloc_sadl(ifp); #if NBPFILTER > 0 bpfattach(&pflogif[i].sc_if.if_bpf, ifp, DLT_PFLOG, PFLOG_HDRLEN); #endif } } /* * Start output on the pflog interface. */ void pflogstart(struct ifnet *ifp) { struct mbuf *m; int s; for (;;) { s = splimp(); IF_DROP(&ifp->if_snd); IF_DEQUEUE(&ifp->if_snd, m); splx(s); if (m == NULL) return; else m_freem(m); } } int pflogoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, struct rtentry *rt) { m_freem(m); return (0); } /* ARGSUSED */ void pflogrtrequest(int cmd, struct rtentry *rt, struct sockaddr *sa) { if (rt) rt->rt_rmx.rmx_mtu = PFLOGMTU; } /* ARGSUSED */ int pflogioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { switch (cmd) { case SIOCSIFADDR: case SIOCAIFADDR: case SIOCSIFDSTADDR: case SIOCSIFFLAGS: if (ifp->if_flags & IFF_UP) ifp->if_flags |= IFF_RUNNING; else ifp->if_flags &= ~IFF_RUNNING; break; default: return (EINVAL); } return (0); } 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) { #if NBPFILTER > 0 struct ifnet *ifn; struct pfloghdr hdr; struct mbuf m1; if (kif == NULL || m == NULL || rm == NULL) return (-1); bzero(&hdr, sizeof(hdr)); hdr.length = PFLOG_REAL_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; } else { hdr.rulenr = htonl(am->nr); hdr.subrulenr = htonl(rm->nr); if (ruleset != NULL) memcpy(hdr.ruleset, ruleset->name, sizeof(hdr.ruleset)); } 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 */ m1.m_next = m; m1.m_len = PFLOG_HDRLEN; m1.m_data = (char *) &hdr; ifn = &(pflogif[0].sc_if); if (ifn->if_bpf) bpf_mtap(ifn->if_bpf, &m1); #endif return (0); }