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freebsd-dev/sys/contrib/pf/net/if_pflog.c
Brooks Davis fc74a9f93a Stop embedding struct ifnet at the top of driver softcs. Instead the 
struct ifnet or the layer 2 common structure it was embedded in have
been replaced with a struct ifnet pointer to be filled by a call to the
new function, if_alloc(). The layer 2 common structure is also allocated
via if_alloc() based on the interface type. It is hung off the new
struct ifnet member, if_l2com.

This change removes the size of these structures from the kernel ABI and
will allow us to better manage them as interfaces come and go.

Other changes of note:
 - Struct arpcom is no longer referenced in normal interface code.
   Instead the Ethernet address is accessed via the IFP2ENADDR() macro.
   To enforce this ac_enaddr has been renamed to _ac_enaddr.
 - The second argument to ether_ifattach is now always the mac address
   from driver private storage rather than sometimes being ac_enaddr.

Reviewed by:	sobomax, sam
2005-06-10 16:49:24 +00:00

388 lines
8.0 KiB
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/* $FreeBSD$ */
/* $OpenBSD: if_pflog.c,v 1.12 2004/05/19 17:50:51 dhartmei 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.
*/
#ifdef __FreeBSD__
#include "opt_inet.h"
#include "opt_inet6.h"
#endif
#ifndef __FreeBSD__
#include "bpfilter.h"
#include "pflog.h"
#elif __FreeBSD__ >= 5
#include "opt_bpf.h"
#include "opt_pf.h"
#define NBPFILTER DEV_BPF
#define NPFLOG DEV_PFLOG
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#ifdef __FreeBSD__
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/sockio.h>
#else
#include <sys/ioctl.h>
#endif
#include <net/if.h>
#if defined(__FreeBSD__)
#include <net/if_clone.h>
#endif
#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 __FreeBSD__
#include <machine/in_cksum.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>
#ifdef __FreeBSD__
#define PFLOGNAME "pflog"
#endif
#define PFLOGMTU (32768 + MHLEN + MLEN)
#ifdef PFLOGDEBUG
#define DPRINTF(x) do { if (pflogdebug) printf x ; } while (0)
#else
#define DPRINTF(x)
#endif
#ifndef __FreeBSD__
struct pflog_softc pflogif[NPFLOG];
#endif
#ifdef __FreeBSD__
static void pflog_clone_destroy(struct ifnet *);
static int pflog_clone_create(struct if_clone *, int);
#else
void pflogattach(int);
#endif
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 *);
#ifndef __FreeBSD__
extern int ifqmaxlen;
#endif
#ifdef __FreeBSD__
static MALLOC_DEFINE(M_PFLOG, PFLOGNAME, "Packet Filter Logging Interface");
static LIST_HEAD(pflog_list, pflog_softc) pflog_list;
#define SCP2IFP(sc) ((sc)->sc_ifp)
IFC_SIMPLE_DECLARE(pflog, 1);
static void
pflog_clone_destroy(struct ifnet *ifp)
{
struct pflog_softc *sc;
sc = ifp->if_softc;
/*
* Does we really need this?
*/
IF_DRAIN(&ifp->if_snd);
bpfdetach(ifp);
if_detach(ifp);
if_free(ifp);
LIST_REMOVE(sc, sc_next);
free(sc, M_PFLOG);
}
static int
pflog_clone_create(struct if_clone *ifc, int unit)
{
struct pflog_softc *sc;
struct ifnet *ifp;
MALLOC(sc, struct pflog_softc *, sizeof(*sc), M_PFLOG, M_WAITOK|M_ZERO);
ifp = sc->sc_ifp = if_alloc(IFT_PFLOG);
if (ifp == NULL) {
free(sc, M_PFLOG);
return (ENOSPC);
}
if_initname(ifp, ifc->ifc_name, 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;
ifp->if_softc = sc;
if_attach(ifp);
LIST_INSERT_HEAD(&pflog_list, sc, sc_next);
#if NBPFILTER > 0
bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN);
#endif
return (0);
}
#else /* !__FreeBSD__ */
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
}
}
#endif /* __FreeBSD__ */
/*
* Start output on the pflog interface.
*/
void
pflogstart(struct ifnet *ifp)
{
struct mbuf *m;
#ifndef __FreeBSD__
int s;
#endif
for (;;) {
#ifdef __FreeBSD__
IF_LOCK(&ifp->if_snd);
_IF_DROP(&ifp->if_snd);
_IF_DEQUEUE(&ifp->if_snd, m);
if (m == NULL) {
IF_UNLOCK(&ifp->if_snd);
return;
}
else
m_freem(m);
IF_UNLOCK(&ifp->if_snd);
#else
s = splimp();
IF_DROP(&ifp->if_snd);
IF_DEQUEUE(&ifp->if_snd, m);
splx(s);
if (m == NULL)
return;
else
m_freem(m);
#endif
}
}
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;
#ifndef __FreeBSD__
struct mbuf m1;
#endif
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 && ruleset->anchor != NULL)
strlcpy(hdr.ruleset, ruleset->anchor->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 */
#ifndef __FreeBSD__
m1.m_next = m;
m1.m_len = PFLOG_HDRLEN;
m1.m_data = (char *) &hdr;
#endif
#ifdef __FreeBSD__
KASSERT((!LIST_EMPTY(&pflog_list)), ("pflog: no interface"));
ifn = SCP2IFP(LIST_FIRST(&pflog_list));
BPF_MTAP2(ifn, &hdr, sizeof(hdr), m);
#else
ifn = &(pflogif[0].sc_if);
if (ifn->if_bpf)
bpf_mtap(ifn->if_bpf, &m1);
#endif
#endif
return (0);
}
#ifdef __FreeBSD__
static int
pflog_modevent(module_t mod, int type, void *data)
{
int error = 0;
switch (type) {
case MOD_LOAD:
LIST_INIT(&pflog_list);
if_clone_attach(&pflog_cloner);
break;
case MOD_UNLOAD:
if_clone_detach(&pflog_cloner);
while (!LIST_EMPTY(&pflog_list))
pflog_clone_destroy(SCP2IFP(LIST_FIRST(&pflog_list)));
break;
default:
error = EINVAL;
break;
}
return error;
}
static moduledata_t pflog_mod = {
"pflog",
pflog_modevent,
0
};
#define PFLOG_MODVER 1
DECLARE_MODULE(pflog, pflog_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
MODULE_VERSION(pflog, PFLOG_MODVER);
#endif /* __FreeBSD__ */
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