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/* $OpenBSD: if_pflog.c,v 1.35 2011/06/20 19:03:41 claudio 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/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>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>
#endif
#ifdef INET6
#ifndef INET
#include <netinet/in.h>
#endif
#include <netinet6/nd6.h>
#include <netinet/icmp6.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
void pflogattach(int);
int pflogoutput(struct ifnet *, struct mbuf *, struct sockaddr *,
struct rtentry *);
int pflogioctl(struct ifnet *, u_long, caddr_t);
void pflogstart(struct ifnet *);
int pflog_clone_create(struct if_clone *, int);
int pflog_clone_destroy(struct ifnet *);
LIST_HEAD(, pflog_softc) pflogif_list;
struct if_clone pflog_cloner =
IF_CLONE_INITIALIZER("pflog", pflog_clone_create, pflog_clone_destroy);
struct ifnet *pflogifs[PFLOGIFS_MAX]; /* for fast access */
struct mbuf *mfake = NULL;
void
pflogattach(int npflog)
{
int i;
LIST_INIT(&pflogif_list);
for (i = 0; i < PFLOGIFS_MAX; i++)
pflogifs[i] = NULL;
if (mfake == NULL)
mfake = m_get(M_DONTWAIT, MT_HEADER);
if_clone_attach(&pflog_cloner);
}
int
pflog_clone_create(struct if_clone *ifc, int unit)
{
struct ifnet *ifp;
struct pflog_softc *pflogif;
int s;
if (unit >= PFLOGIFS_MAX)
return (EINVAL);
if ((pflogif = malloc(sizeof(*pflogif),
M_DEVBUF, M_NOWAIT|M_ZERO)) == NULL)
return (ENOMEM);
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_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->sc_if.if_bpf, ifp, DLT_PFLOG, PFLOG_HDRLEN);
#endif
s = splnet();
LIST_INSERT_HEAD(&pflogif_list, pflogif, sc_list);
pflogifs[unit] = ifp;
splx(s);
return (0);
}
int
pflog_clone_destroy(struct ifnet *ifp)
{
struct pflog_softc *pflogif = ifp->if_softc;
int s;
s = splnet();
pflogifs[pflogif->sc_unit] = NULL;
LIST_REMOVE(pflogif, sc_list);
splx(s);
if_detach(ifp);
free(pflogif, M_DEVBUF);
return (0);
}
/*
* Start output on the pflog interface.
*/
void
pflogstart(struct ifnet *ifp)
{
struct mbuf *m;
int s;
for (;;) {
s = splnet();
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 */
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);
}
int
pflog_packet(struct pfi_kif *kif, struct mbuf *m, u_int8_t dir,
u_int8_t reason, struct pf_rule *rm, struct pf_rule *am,
struct pf_ruleset *ruleset, struct pf_pdesc *pd)
{
#if NBPFILTER > 0
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_REAL_HDRLEN;
hdr.af = pd->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 && ruleset->anchor != NULL)
strlcpy(hdr.ruleset, ruleset->anchor->name,
sizeof(hdr.ruleset));
}
if (rm->log & PF_LOG_SOCKET_LOOKUP && !pd->lookup.done)
pd->lookup.done = pf_socket_lookup(dir, pd);
if (pd->lookup.done > 0) {
hdr.uid = pd->lookup.uid;
hdr.pid = pd->lookup.pid;
} else {
hdr.uid = UID_MAX;
hdr.pid = NO_PID;
}
hdr.rule_uid = rm->cuid;
hdr.rule_pid = rm->cpid;
hdr.dir = dir;
PF_ACPY(&hdr.saddr, &pd->nsaddr, pd->af);
PF_ACPY(&hdr.daddr, &pd->ndaddr, pd->af);
hdr.sport = pd->nsport;
hdr.dport = pd->ndport;
ifn->if_opackets++;
ifn->if_obytes += m->m_pkthdr.len;
bpf_mtap_pflog(ifn->if_bpf, (caddr_t)&hdr, m);
#endif
return (0);
}
void
pflog_bpfcopy(const void *src_arg, void *dst_arg, size_t len)
{
const struct mbuf *m;
struct pfloghdr *pfloghdr;
u_int count;
u_char *dst;
u_short action, reason;
int off = 0, hdrlen = 0;
union {
struct tcphdr tcp;
struct udphdr udp;
struct icmp icmp;
#ifdef INET6
struct icmp6_hdr icmp6;
#endif /* INET6 */
} pf_hdrs;
struct pf_pdesc pd;
struct pf_addr osaddr, odaddr;
u_int16_t osport = 0, odport = 0;
m = src_arg;
dst = dst_arg;
if (m == NULL)
panic("pflog_bpfcopy got no mbuf");
/* first mbuf holds struct pfloghdr */
pfloghdr = mtod(m, struct pfloghdr *);
count = min(m->m_len, len);
bcopy(pfloghdr, dst, count);
pfloghdr = (struct pfloghdr *)dst;
dst += count;
len -= count;
m = m->m_next;
/* second mbuf is pkthdr */
if (len > 0) {
if (m == NULL)
panic("no second mbuf");
bcopy(m, mfake, sizeof(*mfake));
mfake->m_flags &= ~(M_EXT|M_CLUSTER);
mfake->m_next = NULL;
mfake->m_nextpkt = NULL;
mfake->m_data = dst;
mfake->m_len = len;
} else
return;
while (len > 0) {
if (m == 0)
panic("bpf_mcopy");
count = min(m->m_len, len);
bcopy(mtod(m, caddr_t), (caddr_t)dst, count);
m = m->m_next;
dst += count;
len -= count;
}
if (mfake->m_flags & M_PKTHDR)
mfake->m_pkthdr.len = min(mfake->m_pkthdr.len, mfake->m_len);
/* rewrite addresses if needed */
memset(&pd, 0, sizeof(pd));
pd.hdr.any = &pf_hdrs;
if (pf_setup_pdesc(pfloghdr->af, pfloghdr->dir, &pd, &mfake, &action,
&reason, NULL, NULL, NULL, NULL, &off, &hdrlen) == -1)
return;
PF_ACPY(&osaddr, pd.src, pd.af);
PF_ACPY(&odaddr, pd.dst, pd.af);
if (pd.sport)
osport = *pd.sport;
if (pd.dport)
odport = *pd.dport;
if ((pfloghdr->rewritten = pf_translate(&pd, &pfloghdr->saddr,
pfloghdr->sport, &pfloghdr->daddr, pfloghdr->dport, 0,
pfloghdr->dir))) {
m_copyback(mfake, off, min(mfake->m_len - off, hdrlen),
pd.hdr.any, M_NOWAIT);
PF_ACPY(&pfloghdr->saddr, &osaddr, pd.af);
PF_ACPY(&pfloghdr->daddr, &odaddr, pd.af);
pfloghdr->sport = osport;
pfloghdr->dport = odport;
}
}
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