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/* $OpenBSD: if_pflog.c,v 1.98 2023/10/12 19:15:21 bluhm 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.
* Copyright (c) 2002 - 2010 Henning Brauer
*
* 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/proc.h>
#include <sys/socket.h>
#include <sys/stdint.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_types.h>
#if NBPFILTER > 0
#include <net/bpf.h>
#endif
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#ifdef INET6
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#endif /* INET6 */
#include <net/pfvar.h>
#include <net/pfvar_priv.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
void pflogattach(int);
int pflogoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
int pflogioctl(struct ifnet *, u_long, caddr_t);
int pflog_clone_create(struct if_clone *, int);
int pflog_clone_destroy(struct ifnet *);
struct pflog_softc *pflog_getif(int);
struct if_clone pflog_cloner =
IF_CLONE_INITIALIZER("pflog", pflog_clone_create, pflog_clone_destroy);
LIST_HEAD(, pflog_softc) pflog_ifs = LIST_HEAD_INITIALIZER(pflog_ifs);
void
pflogattach(int npflog)
{
if_clone_attach(&pflog_cloner);
}
int
pflog_clone_create(struct if_clone *ifc, int unit)
{
struct ifnet *ifp;
struct pflog_softc *pflogif;
pflogif = malloc(sizeof(*pflogif), M_DEVBUF, M_WAITOK|M_ZERO);
pflogif->sc_unit = unit;
ifp = &pflogif->sc_if;
snprintf(ifp->if_xname, sizeof ifp->if_xname, "pflog%d", unit);
ifp->if_softc = pflogif;
ifp->if_mtu = PFLOGMTU;
ifp->if_ioctl = pflogioctl;
ifp->if_output = pflogoutput;
ifp->if_xflags = IFXF_CLONED;
ifp->if_type = IFT_PFLOG;
ifp->if_hdrlen = PFLOG_HDRLEN;
if_attach(ifp);
if_alloc_sadl(ifp);
#if NBPFILTER > 0
bpfattach(&pflogif->sc_if.if_bpf, ifp, DLT_PFLOG, PFLOG_HDRLEN);
#endif
NET_LOCK();
LIST_INSERT_HEAD(&pflog_ifs, pflogif, sc_entry);
NET_UNLOCK();
return (0);
}
int
pflog_clone_destroy(struct ifnet *ifp)
{
struct pflog_softc *pflogif = ifp->if_softc;
NET_LOCK();
LIST_REMOVE(pflogif, sc_entry);
NET_UNLOCK();
if_detach(ifp);
free(pflogif, M_DEVBUF, sizeof(*pflogif));
return (0);
}
int
pflogoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
struct rtentry *rt)
{
m_freem(m); /* drop packet */
return (EAFNOSUPPORT);
}
int
pflogioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
switch (cmd) {
case SIOCSIFFLAGS:
if (ifp->if_flags & IFF_UP)
ifp->if_flags |= IFF_RUNNING;
else
ifp->if_flags &= ~IFF_RUNNING;
break;
default:
return (ENOTTY);
}
return (0);
}
struct pflog_softc *
pflog_getif(int unit)
{
struct pflog_softc *pflogif;
NET_ASSERT_LOCKED();
LIST_FOREACH(pflogif, &pflog_ifs, sc_entry) {
if (pflogif->sc_unit == unit)
break;
}
return pflogif;
}
int
pflog_packet(struct pf_pdesc *pd, u_int8_t reason, struct pf_rule *rm,
struct pf_rule *am, struct pf_ruleset *ruleset, struct pf_rule *trigger)
{
#if NBPFILTER > 0
struct pflog_softc *pflogif;
struct ifnet *ifn;
caddr_t if_bpf;
struct pfloghdr hdr;
if (rm == NULL || pd == NULL || pd->kif == NULL || pd->m == NULL)
return (-1);
if (trigger == NULL)
trigger = rm;
pflogif = pflog_getif(trigger->logif);
if (pflogif == NULL)
return (0);
ifn = &pflogif->sc_if;
if_bpf = ifn->if_bpf;
if (!if_bpf)
return (0);
bzero(&hdr, sizeof(hdr));
hdr.length = PFLOG_REAL_HDRLEN;
/* Default rule does not pass packets dropped for other reasons. */
hdr.action = (rm->nr == (u_int32_t)-1 && reason != PFRES_MATCH) ?
PF_DROP : rm->action;
hdr.reason = reason;
memcpy(hdr.ifname, pd->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 && ruleset->anchor != NULL)
strlcpy(hdr.ruleset, ruleset->anchor->name,
sizeof(hdr.ruleset));
}
if (trigger->log & PF_LOG_USER && !pd->lookup.done)
pd->lookup.done = pf_socket_lookup(pd);
if (trigger->log & PF_LOG_USER && pd->lookup.done > 0) {
hdr.uid = pd->lookup.uid;
hdr.pid = pd->lookup.pid;
} else {
hdr.uid = -1;
hdr.pid = NO_PID;
}
hdr.rule_uid = rm->cuid;
hdr.rule_pid = rm->cpid;
hdr.dir = pd->dir;
hdr.af = pd->af;
if (pd->src != NULL && pd->dst != NULL) {
if (pd->af != pd->naf ||
pf_addr_compare(pd->src, &pd->nsaddr, pd->naf) != 0 ||
pf_addr_compare(pd->dst, &pd->ndaddr, pd->naf) != 0 ||
pd->osport != pd->nsport ||
pd->odport != pd->ndport) {
hdr.rewritten = 1;
}
}
hdr.naf = pd->naf;
pf_addrcpy(&hdr.saddr, &pd->nsaddr, pd->naf);
pf_addrcpy(&hdr.daddr, &pd->ndaddr, pd->naf);
hdr.sport = pd->nsport;
hdr.dport = pd->ndport;
ifn->if_opackets++;
ifn->if_obytes += pd->m->m_pkthdr.len;
bpf_mtap_hdr(if_bpf, &hdr, sizeof(hdr), pd->m, BPF_DIRECTION_OUT);
#endif
return (0);
}
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