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freebsd-skq/sys/net/if_ef.c
Sam Leffler 437ffe1823 o eliminate widespread on-stack mbuf use for bpf by introducing 
a new bpf_mtap2 routine that does the right thing for an mbuf
  and a variable-length chunk of data that should be prepended.
o while we're sweeping the drivers, use u_int32_t uniformly when
  when prepending the address family (several places were assuming
  sizeof(int) was 4)
o return M_ASSERTVALID to BPF_MTAP* now that all stack-allocated
  mbufs have been eliminated; this may better be moved to the bpf
  routines

Reviewed by:	arch@ and several others
2003-12-28 03:56:00 +00:00

596 lines
13 KiB
C
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/*-
* Copyright (c) 1999, 2000 Boris Popov
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include "opt_inet.h"
#include "opt_ipx.h"
#include "opt_ef.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sockio.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <net/ethernet.h>
#include <net/if_llc.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#ifdef INET
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#endif
#ifdef IPX
#include <netipx/ipx.h>
#include <netipx/ipx_if.h>
#endif
/* internal frame types */
#define ETHER_FT_EII 0 /* Ethernet_II - default */
#define ETHER_FT_8023 1 /* 802.3 (Novell) */
#define ETHER_FT_8022 2 /* 802.2 */
#define ETHER_FT_SNAP 3 /* SNAP */
#define EF_NFT 4 /* total number of frame types */
#ifdef EF_DEBUG
#define EFDEBUG(format, args...) printf("%s: "format, __func__ ,## args)
#else
#define EFDEBUG(format, args...)
#endif
#define EFERROR(format, args...) printf("%s: "format, __func__ ,## args)
struct efnet {
struct arpcom ef_ac;
struct ifnet * ef_ifp;
int ef_frametype;
};
struct ef_link {
SLIST_ENTRY(ef_link) el_next;
struct ifnet *el_ifp; /* raw device for this clones */
struct efnet *el_units[EF_NFT]; /* our clones */
};
static SLIST_HEAD(ef_link_head, ef_link) efdev = {NULL};
static int efcount;
extern int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m);
extern int (*ef_outputp)(struct ifnet *ifp, struct mbuf **mp,
struct sockaddr *dst, short *tp, int *hlen);
/*
static void ef_reset (struct ifnet *);
*/
static int ef_attach(struct efnet *sc);
static int ef_detach(struct efnet *sc);
static void ef_init(void *);
static int ef_ioctl(struct ifnet *, u_long, caddr_t);
static void ef_start(struct ifnet *);
static int ef_input(struct ifnet*, struct ether_header *, struct mbuf *);
static int ef_output(struct ifnet *ifp, struct mbuf **mp,
struct sockaddr *dst, short *tp, int *hlen);
static int ef_load(void);
static int ef_unload(void);
/*
* Install the interface, most of structure initialization done in ef_clone()
*/
static int
ef_attach(struct efnet *sc)
{
struct ifnet *ifp = (struct ifnet*)&sc->ef_ac.ac_if;
struct ifaddr *ifa2;
struct sockaddr_dl *sdl2;
ifp->if_output = ether_output;
ifp->if_start = ef_start;
ifp->if_watchdog = NULL;
ifp->if_init = ef_init;
ifp->if_snd.ifq_maxlen = IFQ_MAXLEN;
ifp->if_flags = (IFF_BROADCAST | IFF_SIMPLEX | IFF_MULTICAST);
/*
* Attach the interface
*/
ifa2 = ifaddr_byindex(sc->ef_ifp->if_index);
sdl2 = (struct sockaddr_dl *)ifa2->ifa_addr;
ether_ifattach(ifp, LLADDR(sdl2));
ifp->if_resolvemulti = 0;
ifp->if_type = IFT_XETHER;
ifp->if_flags |= IFF_RUNNING;
bcopy(LLADDR(sdl2), sc->ef_ac.ac_enaddr, ETHER_ADDR_LEN);
EFDEBUG("%s: attached\n", ifp->if_xname);
return 1;
}
/*
* This is for _testing_only_, just removes interface from interfaces list
*/
static int
ef_detach(struct efnet *sc)
{
struct ifnet *ifp = (struct ifnet*)&sc->ef_ac.ac_if;
int s;
s = splimp();
if (ifp->if_flags & IFF_UP) {
if_down(ifp);
if (ifp->if_flags & IFF_RUNNING) {
/* find internet addresses and delete routes */
register struct ifaddr *ifa;
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
rtinit(ifa, (int)RTM_DELETE, 0);
}
}
}
IFNET_WLOCK();
TAILQ_REMOVE(&ifnet, ifp, if_link);
IFNET_WUNLOCK();
splx(s);
return 0;
}
static void
ef_init(void *foo) {
return;
}
static int
ef_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
{
struct efnet *sc = ifp->if_softc;
struct ifaddr *ifa = (struct ifaddr*)data;
int s, error;
EFDEBUG("IOCTL %ld for %s\n", cmd, ifp->if_xname);
error = 0;
s = splimp();
switch (cmd) {
case SIOCSIFFLAGS:
error = 0;
break;
case SIOCSIFADDR:
if (sc->ef_frametype == ETHER_FT_8023 &&
ifa->ifa_addr->sa_family != AF_IPX) {
error = EAFNOSUPPORT;
break;
}
ifp->if_flags |= IFF_UP;
/* FALL THROUGH */
default:
error = ether_ioctl(ifp, cmd, data);
break;
}
splx(s);
return error;
}
/*
* Currently packet prepared in the ether_output(), but this can be a better
* place.
*/
static void
ef_start(struct ifnet *ifp)
{
struct efnet *sc = (struct efnet*)ifp->if_softc;
struct ifnet *p;
struct mbuf *m;
ifp->if_flags |= IFF_OACTIVE;
p = sc->ef_ifp;
EFDEBUG("\n");
for (;;) {
IF_DEQUEUE(&ifp->if_snd, m);
if (m == 0)
break;
BPF_MTAP(ifp, m);
if (! IF_HANDOFF(&p->if_snd, m, p)) {
ifp->if_oerrors++;
continue;
}
ifp->if_opackets++;
}
ifp->if_flags &= ~IFF_OACTIVE;
return;
}
/*
* Inline functions do not put additional overhead to procedure call or
* parameter passing but simplify the code
*/
static int __inline
ef_inputEII(struct mbuf *m, struct ether_header *eh, u_short ether_type)
{
int isr;
switch(ether_type) {
#ifdef IPX
case ETHERTYPE_IPX:
isr = NETISR_IPX;
break;
#endif
#ifdef INET
case ETHERTYPE_IP:
if (ip_fastforward(m))
return (0);
isr = NETISR_IP;
break;
case ETHERTYPE_ARP:
isr = NETISR_ARP;
break;
#endif
default:
return (EPROTONOSUPPORT);
}
netisr_dispatch(isr, m);
return (0);
}
static int __inline
ef_inputSNAP(struct mbuf *m, struct ether_header *eh, struct llc* l,
u_short ether_type)
{
int isr;
switch(ether_type) {
#ifdef IPX
case ETHERTYPE_IPX:
m_adj(m, 8);
isr = NETISR_IPX;
break;
#endif
default:
return (EPROTONOSUPPORT);
}
netisr_dispatch(isr, m);
return (0);
}
static int __inline
ef_input8022(struct mbuf *m, struct ether_header *eh, struct llc* l,
u_short ether_type)
{
int isr;
switch(ether_type) {
#ifdef IPX
case 0xe0:
m_adj(m, 3);
isr = NETISR_IPX;
break;
#endif
default:
return (EPROTONOSUPPORT);
}
netisr_dispatch(isr, m);
return (0);
}
/*
* Called from ether_input()
*/
static int
ef_input(struct ifnet *ifp, struct ether_header *eh, struct mbuf *m)
{
u_short ether_type;
int ft = -1;
struct efnet *efp;
struct ifnet *eifp;
struct llc *l;
struct ef_link *efl;
int isr;
ether_type = ntohs(eh->ether_type);
if (ether_type < ETHERMTU) {
l = mtod(m, struct llc*);
if (l->llc_dsap == 0xff && l->llc_ssap == 0xff) {
/*
* Novell's "802.3" frame
*/
ft = ETHER_FT_8023;
} else if (l->llc_dsap == 0xaa && l->llc_ssap == 0xaa) {
/*
* 802.2/SNAP
*/
ft = ETHER_FT_SNAP;
ether_type = ntohs(l->llc_un.type_snap.ether_type);
} else if (l->llc_dsap == l->llc_ssap) {
/*
* 802.3/802.2
*/
ft = ETHER_FT_8022;
ether_type = l->llc_ssap;
}
} else
ft = ETHER_FT_EII;
if (ft == -1) {
EFDEBUG("Unrecognised ether_type %x\n", ether_type);
return EPROTONOSUPPORT;
}
/*
* Check if interface configured for the given frame
*/
efp = NULL;
SLIST_FOREACH(efl, &efdev, el_next) {
if (efl->el_ifp == ifp) {
efp = efl->el_units[ft];
break;
}
}
if (efp == NULL) {
EFDEBUG("Can't find if for %d\n", ft);
return EPROTONOSUPPORT;
}
eifp = &efp->ef_ac.ac_if;
if ((eifp->if_flags & IFF_UP) == 0)
return EPROTONOSUPPORT;
eifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh);
m->m_pkthdr.rcvif = eifp;
BPF_MTAP2(eifp, eh, ETHER_HDR_LEN, m);
/*
* Now we ready to adjust mbufs and pass them to protocol intr's
*/
switch(ft) {
case ETHER_FT_EII:
return (ef_inputEII(m, eh, ether_type));
#ifdef IPX
case ETHER_FT_8023: /* only IPX can be here */
isr = NETISR_IPX;
break;
#endif
case ETHER_FT_SNAP:
return (ef_inputSNAP(m, eh, l, ether_type));
case ETHER_FT_8022:
return (ef_input8022(m, eh, l, ether_type));
default:
EFDEBUG("No support for frame %d and proto %04x\n",
ft, ether_type);
return (EPROTONOSUPPORT);
}
netisr_dispatch(isr, m);
return (0);
}
static int
ef_output(struct ifnet *ifp, struct mbuf **mp, struct sockaddr *dst, short *tp,
int *hlen)
{
struct efnet *sc = (struct efnet*)ifp->if_softc;
struct mbuf *m = *mp;
u_char *cp;
short type;
if (ifp->if_type != IFT_XETHER)
return ENETDOWN;
switch (sc->ef_frametype) {
case ETHER_FT_EII:
#ifdef IPX
type = htons(ETHERTYPE_IPX);
#else
return EPFNOSUPPORT;
#endif
break;
case ETHER_FT_8023:
type = htons(m->m_pkthdr.len);
break;
case ETHER_FT_8022:
M_PREPEND(m, ETHER_HDR_LEN + 3, M_TRYWAIT);
if (m == NULL) {
*mp = NULL;
return ENOBUFS;
}
/*
* Ensure that ethernet header and next three bytes
* will fit into single mbuf
*/
m = m_pullup(m, ETHER_HDR_LEN + 3);
if (m == NULL) {
*mp = NULL;
return ENOBUFS;
}
m_adj(m, ETHER_HDR_LEN);
type = htons(m->m_pkthdr.len);
cp = mtod(m, u_char *);
*cp++ = 0xE0;
*cp++ = 0xE0;
*cp++ = 0x03;
*hlen += 3;
break;
case ETHER_FT_SNAP:
M_PREPEND(m, 8, M_TRYWAIT);
if (m == NULL) {
*mp = NULL;
return ENOBUFS;
}
type = htons(m->m_pkthdr.len);
cp = mtod(m, u_char *);
bcopy("\xAA\xAA\x03\x00\x00\x00\x81\x37", cp, 8);
*hlen += 8;
break;
default:
return EPFNOSUPPORT;
}
*mp = m;
*tp = type;
return 0;
}
/*
* Create clone from the given interface
*/
static int
ef_clone(struct ef_link *efl, int ft)
{
struct efnet *efp;
struct ifnet *eifp;
struct ifnet *ifp = efl->el_ifp;
efp = (struct efnet*)malloc(sizeof(struct efnet), M_IFADDR,
M_WAITOK | M_ZERO);
if (efp == NULL)
return ENOMEM;
efp->ef_ifp = ifp;
efp->ef_frametype = ft;
eifp = &efp->ef_ac.ac_if;
snprintf(eifp->if_xname, IFNAMSIZ,
"%sf%d", ifp->if_xname, efp->ef_frametype);
eifp->if_dname = "ef";
eifp->if_dunit = IF_DUNIT_NONE;
eifp->if_softc = efp;
if (ifp->if_ioctl)
eifp->if_ioctl = ef_ioctl;
efl->el_units[ft] = efp;
return 0;
}
static int
ef_load(void)
{
struct ifnet *ifp;
struct efnet *efp;
struct ef_link *efl = NULL;
int error = 0, d;
IFNET_RLOCK();
TAILQ_FOREACH(ifp, &ifnet, if_link) {
if (ifp->if_type != IFT_ETHER) continue;
EFDEBUG("Found interface %s\n", ifp->if_xname);
efl = (struct ef_link*)malloc(sizeof(struct ef_link),
M_IFADDR, M_WAITOK | M_ZERO);
if (efl == NULL) {
error = ENOMEM;
break;
}
efl->el_ifp = ifp;
#ifdef ETHER_II
error = ef_clone(efl, ETHER_FT_EII);
if (error) break;
#endif
#ifdef ETHER_8023
error = ef_clone(efl, ETHER_FT_8023);
if (error) break;
#endif
#ifdef ETHER_8022
error = ef_clone(efl, ETHER_FT_8022);
if (error) break;
#endif
#ifdef ETHER_SNAP
error = ef_clone(efl, ETHER_FT_SNAP);
if (error) break;
#endif
efcount++;
SLIST_INSERT_HEAD(&efdev, efl, el_next);
}
IFNET_RUNLOCK();
if (error) {
if (efl)
SLIST_INSERT_HEAD(&efdev, efl, el_next);
SLIST_FOREACH(efl, &efdev, el_next) {
for (d = 0; d < EF_NFT; d++)
if (efl->el_units[d])
free(efl->el_units[d], M_IFADDR);
free(efl, M_IFADDR);
}
return error;
}
SLIST_FOREACH(efl, &efdev, el_next) {
for (d = 0; d < EF_NFT; d++) {
efp = efl->el_units[d];
if (efp)
ef_attach(efp);
}
}
ef_inputp = ef_input;
ef_outputp = ef_output;
EFDEBUG("Loaded\n");
return 0;
}
static int
ef_unload(void)
{
struct efnet *efp;
struct ef_link *efl;
int d;
ef_inputp = NULL;
ef_outputp = NULL;
SLIST_FOREACH(efl, &efdev, el_next) {
for (d = 0; d < EF_NFT; d++) {
efp = efl->el_units[d];
if (efp) {
ef_detach(efp);
}
}
}
EFDEBUG("Unloaded\n");
return 0;
}
static int
if_ef_modevent(module_t mod, int type, void *data)
{
switch ((modeventtype_t)type) {
case MOD_LOAD:
return ef_load();
case MOD_UNLOAD:
return ef_unload();
default:
break;
}
return 0;
}
static moduledata_t if_ef_mod = {
"if_ef", if_ef_modevent, NULL
};
DECLARE_MODULE(if_ef, if_ef_mod, SI_SUB_PSEUDO, SI_ORDER_MIDDLE);
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