76039bc84f
to this event, adding if_var.h to files that do need it. Also, include all includes that now are included due to implicit pollution via if_var.h Sponsored by: Netflix Sponsored by: Nginx, Inc.
296 lines
6.7 KiB
C
296 lines
6.7 KiB
C
/*-
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* The authors of this code are John Ioannidis (ji@tla.org),
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* Angelos D. Keromytis (kermit@csd.uch.gr) and
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* Niels Provos (provos@physnet.uni-hamburg.de).
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*
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* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
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* in November 1995.
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*
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* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
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* by Angelos D. Keromytis.
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*
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* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
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* and Niels Provos.
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*
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* Copyright (C) 1995, 1996, 1997, 1998 by John Ioannidis, Angelos D. Keromytis
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* and Niels Provos.
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* Copyright (c) 2001, Angelos D. Keromytis, Niels Provos.
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*
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* Permission to use, copy, and modify this software with or without fee
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* is hereby granted, provided that this entire notice is included in
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* all copies of any software which is or includes a copy or
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* modification of this software.
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* You may use this code under the GNU public license if you so wish. Please
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* contribute changes back to the authors under this freer than GPL license
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* so that we may further the use of strong encryption without limitations to
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* all.
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*
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
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* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
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* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
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* PURPOSE.
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*
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* $OpenBSD: if_pflog.c,v 1.26 2007/10/18 21:58:18 mpf Exp $
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_bpf.h"
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#include "opt_pf.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/mbuf.h>
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#include <sys/module.h>
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#include <sys/proc.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <net/bpf.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/if_clone.h>
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#include <net/if_pflog.h>
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#include <net/if_types.h>
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#include <net/vnet.h>
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#include <net/pfvar.h>
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#if defined(INET) || defined(INET6)
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#include <netinet/in.h>
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#endif
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#ifdef INET
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#endif
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#ifdef INET6
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#include <netinet6/in6_var.h>
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#include <netinet6/nd6.h>
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#endif /* INET6 */
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#ifdef INET
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#include <machine/in_cksum.h>
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#endif /* INET */
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#define PFLOGMTU (32768 + MHLEN + MLEN)
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#ifdef PFLOGDEBUG
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#define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0)
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#else
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#define DPRINTF(x)
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#endif
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static int pflogoutput(struct ifnet *, struct mbuf *,
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const struct sockaddr *, struct route *);
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static void pflogattach(int);
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static int pflogioctl(struct ifnet *, u_long, caddr_t);
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static void pflogstart(struct ifnet *);
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static int pflog_clone_create(struct if_clone *, int, caddr_t);
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static void pflog_clone_destroy(struct ifnet *);
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static struct if_clone *pflog_cloner;
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static const char pflogname[] = "pflog";
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struct ifnet *pflogifs[PFLOGIFS_MAX]; /* for fast access */
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static void
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pflogattach(int npflog)
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{
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int i;
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for (i = 0; i < PFLOGIFS_MAX; i++)
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pflogifs[i] = NULL;
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pflog_cloner = if_clone_simple(pflogname, pflog_clone_create,
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pflog_clone_destroy, 1);
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}
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static int
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pflog_clone_create(struct if_clone *ifc, int unit, caddr_t param)
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{
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struct ifnet *ifp;
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if (unit >= PFLOGIFS_MAX)
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return (EINVAL);
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ifp = if_alloc(IFT_PFLOG);
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if (ifp == NULL) {
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return (ENOSPC);
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}
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if_initname(ifp, pflogname, unit);
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ifp->if_mtu = PFLOGMTU;
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ifp->if_ioctl = pflogioctl;
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ifp->if_output = pflogoutput;
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ifp->if_start = pflogstart;
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ifp->if_snd.ifq_maxlen = ifqmaxlen;
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ifp->if_hdrlen = PFLOG_HDRLEN;
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if_attach(ifp);
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bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN);
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pflogifs[unit] = ifp;
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return (0);
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}
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static void
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pflog_clone_destroy(struct ifnet *ifp)
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{
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int i;
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for (i = 0; i < PFLOGIFS_MAX; i++)
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if (pflogifs[i] == ifp)
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pflogifs[i] = NULL;
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bpfdetach(ifp);
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if_detach(ifp);
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if_free(ifp);
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}
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/*
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* Start output on the pflog interface.
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*/
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static void
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pflogstart(struct ifnet *ifp)
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{
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struct mbuf *m;
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for (;;) {
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IF_LOCK(&ifp->if_snd);
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_IF_DROP(&ifp->if_snd);
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_IF_DEQUEUE(&ifp->if_snd, m);
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IF_UNLOCK(&ifp->if_snd);
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if (m == NULL)
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return;
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else
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m_freem(m);
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}
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}
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static int
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pflogoutput(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
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struct route *rt)
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{
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m_freem(m);
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return (0);
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}
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/* ARGSUSED */
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static int
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pflogioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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{
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switch (cmd) {
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case SIOCSIFFLAGS:
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if (ifp->if_flags & IFF_UP)
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ifp->if_drv_flags |= IFF_DRV_RUNNING;
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else
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ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
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break;
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default:
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return (ENOTTY);
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}
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return (0);
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}
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static int
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pflog_packet(struct pfi_kif *kif, struct mbuf *m, sa_family_t af, u_int8_t dir,
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u_int8_t reason, struct pf_rule *rm, struct pf_rule *am,
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struct pf_ruleset *ruleset, struct pf_pdesc *pd, int lookupsafe)
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{
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struct ifnet *ifn;
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struct pfloghdr hdr;
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if (kif == NULL || m == NULL || rm == NULL || pd == NULL)
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return ( 1);
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if ((ifn = pflogifs[rm->logif]) == NULL || !ifn->if_bpf)
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return (0);
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bzero(&hdr, sizeof(hdr));
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hdr.length = PFLOG_REAL_HDRLEN;
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hdr.af = af;
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hdr.action = rm->action;
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hdr.reason = reason;
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memcpy(hdr.ifname, kif->pfik_name, sizeof(hdr.ifname));
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if (am == NULL) {
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hdr.rulenr = htonl(rm->nr);
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hdr.subrulenr = 1;
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} else {
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hdr.rulenr = htonl(am->nr);
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hdr.subrulenr = htonl(rm->nr);
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if (ruleset != NULL && ruleset->anchor != NULL)
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strlcpy(hdr.ruleset, ruleset->anchor->name,
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sizeof(hdr.ruleset));
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}
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/*
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* XXXGL: we avoid pf_socket_lookup() when we are holding
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* state lock, since this leads to unsafe LOR.
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* These conditions are very very rare, however.
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*/
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if (rm->log & PF_LOG_SOCKET_LOOKUP && !pd->lookup.done && lookupsafe)
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pd->lookup.done = pf_socket_lookup(dir, pd, m);
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if (pd->lookup.done > 0)
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hdr.uid = pd->lookup.uid;
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else
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hdr.uid = UID_MAX;
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hdr.pid = NO_PID;
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hdr.rule_uid = rm->cuid;
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hdr.rule_pid = rm->cpid;
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hdr.dir = dir;
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#ifdef INET
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if (af == AF_INET && dir == PF_OUT) {
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struct ip *ip;
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ip = mtod(m, struct ip *);
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ip->ip_sum = 0;
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ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
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}
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#endif /* INET */
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ifn->if_opackets++;
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ifn->if_obytes += m->m_pkthdr.len;
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BPF_MTAP2(ifn, &hdr, PFLOG_HDRLEN, m);
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return (0);
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}
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static int
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pflog_modevent(module_t mod, int type, void *data)
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{
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int error = 0;
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switch (type) {
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case MOD_LOAD:
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pflogattach(1);
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PF_RULES_WLOCK();
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pflog_packet_ptr = pflog_packet;
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PF_RULES_WUNLOCK();
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break;
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case MOD_UNLOAD:
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PF_RULES_WLOCK();
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pflog_packet_ptr = NULL;
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PF_RULES_WUNLOCK();
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if_clone_detach(pflog_cloner);
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break;
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default:
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error = EINVAL;
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break;
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}
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return error;
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}
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static moduledata_t pflog_mod = { pflogname, pflog_modevent, 0 };
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#define PFLOG_MODVER 1
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DECLARE_MODULE(pflog, pflog_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
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MODULE_VERSION(pflog, PFLOG_MODVER);
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MODULE_DEPEND(pflog, pf, PF_MODVER, PF_MODVER, PF_MODVER);
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