freebsd-dev/sys/net/if_fddisubr.c
George V. Neville-Neil 33872124a5 Replace the fastforward path with tryforward which does not require a
sysctl and will always be on. The former split between default and
fast forwarding is removed by this commit while preserving the ability
to use all network stack features.

Differential Revision:	https://reviews.freebsd.org/D4042
Reviewed by:	ae, melifaro, olivier, rwatson
MFC after:	1 month
Sponsored by:	Rubicon Communications (Netgate)
2015-11-05 07:26:32 +00:00

672 lines
15 KiB
C

/*-
* Copyright (c) 1995, 1996
* Matt Thomas <matt@3am-software.com>. All rights reserved.
* Copyright (c) 1982, 1989, 1993
* The Regents of the University of California. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* from: if_ethersubr.c,v 1.5 1994/12/13 22:31:45 wollman Exp
* $FreeBSD$
*/
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/if_llc.h>
#include <net/if_types.h>
#include <net/if_llatbl.h>
#include <net/ethernet.h>
#include <net/netisr.h>
#include <net/route.h>
#include <net/bpf.h>
#include <net/fddi.h>
#if defined(INET) || defined(INET6)
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#endif
#ifdef INET6
#include <netinet6/nd6.h>
#endif
#ifdef DECNET
#include <netdnet/dn.h>
#endif
#include <security/mac/mac_framework.h>
static const u_char fddibroadcastaddr[FDDI_ADDR_LEN] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
static int fddi_resolvemulti(struct ifnet *, struct sockaddr **,
struct sockaddr *);
static int fddi_output(struct ifnet *, struct mbuf *, const struct sockaddr *,
struct route *);
static void fddi_input(struct ifnet *ifp, struct mbuf *m);
#define senderr(e) do { error = (e); goto bad; } while (0)
/*
* FDDI output routine.
* Encapsulate a packet of type family for the local net.
* Use trailer local net encapsulation if enough data in first
* packet leaves a multiple of 512 bytes of data in remainder.
*/
static int
fddi_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
struct route *ro)
{
u_int16_t type;
int loop_copy = 0, error = 0, hdrcmplt = 0;
u_char esrc[FDDI_ADDR_LEN], edst[FDDI_ADDR_LEN];
struct fddi_header *fh;
#if defined(INET) || defined(INET6)
int is_gw = 0;
#endif
#ifdef MAC
error = mac_ifnet_check_transmit(ifp, m);
if (error)
senderr(error);
#endif
if (ifp->if_flags & IFF_MONITOR)
senderr(ENETDOWN);
if (!((ifp->if_flags & IFF_UP) &&
(ifp->if_drv_flags & IFF_DRV_RUNNING)))
senderr(ENETDOWN);
getmicrotime(&ifp->if_lastchange);
#if defined(INET) || defined(INET6)
if (ro != NULL && ro->ro_rt != NULL &&
(ro->ro_rt->rt_flags & RTF_GATEWAY) != 0)
is_gw = 1;
#endif
switch (dst->sa_family) {
#ifdef INET
case AF_INET: {
error = arpresolve(ifp, is_gw, m, dst, edst, NULL);
if (error)
return (error == EWOULDBLOCK ? 0 : error);
type = htons(ETHERTYPE_IP);
break;
}
case AF_ARP:
{
struct arphdr *ah;
ah = mtod(m, struct arphdr *);
ah->ar_hrd = htons(ARPHRD_ETHER);
loop_copy = -1; /* if this is for us, don't do it */
switch (ntohs(ah->ar_op)) {
case ARPOP_REVREQUEST:
case ARPOP_REVREPLY:
type = htons(ETHERTYPE_REVARP);
break;
case ARPOP_REQUEST:
case ARPOP_REPLY:
default:
type = htons(ETHERTYPE_ARP);
break;
}
if (m->m_flags & M_BCAST)
bcopy(ifp->if_broadcastaddr, edst, FDDI_ADDR_LEN);
else
bcopy(ar_tha(ah), edst, FDDI_ADDR_LEN);
}
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
error = nd6_resolve(ifp, is_gw, m, dst, edst, NULL);
if (error)
return (error == EWOULDBLOCK ? 0 : error);
type = htons(ETHERTYPE_IPV6);
break;
#endif /* INET6 */
case pseudo_AF_HDRCMPLT:
{
const struct ether_header *eh;
hdrcmplt = 1;
eh = (const struct ether_header *)dst->sa_data;
bcopy(eh->ether_shost, esrc, FDDI_ADDR_LEN);
/* FALLTHROUGH */
}
case AF_UNSPEC:
{
const struct ether_header *eh;
loop_copy = -1;
eh = (const struct ether_header *)dst->sa_data;
bcopy(eh->ether_dhost, edst, FDDI_ADDR_LEN);
if (*edst & 1)
m->m_flags |= (M_BCAST|M_MCAST);
type = eh->ether_type;
break;
}
case AF_IMPLINK:
{
fh = mtod(m, struct fddi_header *);
error = EPROTONOSUPPORT;
switch (fh->fddi_fc & (FDDIFC_C|FDDIFC_L|FDDIFC_F)) {
case FDDIFC_LLC_ASYNC: {
/* legal priorities are 0 through 7 */
if ((fh->fddi_fc & FDDIFC_Z) > 7)
goto bad;
break;
}
case FDDIFC_LLC_SYNC: {
/* FDDIFC_Z bits reserved, must be zero */
if (fh->fddi_fc & FDDIFC_Z)
goto bad;
break;
}
case FDDIFC_SMT: {
/* FDDIFC_Z bits must be non zero */
if ((fh->fddi_fc & FDDIFC_Z) == 0)
goto bad;
break;
}
default: {
/* anything else is too dangerous */
goto bad;
}
}
error = 0;
if (fh->fddi_dhost[0] & 1)
m->m_flags |= (M_BCAST|M_MCAST);
goto queue_it;
}
default:
if_printf(ifp, "can't handle af%d\n", dst->sa_family);
senderr(EAFNOSUPPORT);
}
/*
* Add LLC header.
*/
if (type != 0) {
struct llc *l;
M_PREPEND(m, LLC_SNAPFRAMELEN, M_NOWAIT);
if (m == 0)
senderr(ENOBUFS);
l = mtod(m, struct llc *);
l->llc_control = LLC_UI;
l->llc_dsap = l->llc_ssap = LLC_SNAP_LSAP;
l->llc_snap.org_code[0] =
l->llc_snap.org_code[1] =
l->llc_snap.org_code[2] = 0;
l->llc_snap.ether_type = htons(type);
}
/*
* Add local net header. If no space in first mbuf,
* allocate another.
*/
M_PREPEND(m, FDDI_HDR_LEN, M_NOWAIT);
if (m == 0)
senderr(ENOBUFS);
fh = mtod(m, struct fddi_header *);
fh->fddi_fc = FDDIFC_LLC_ASYNC|FDDIFC_LLC_PRIO4;
bcopy((caddr_t)edst, (caddr_t)fh->fddi_dhost, FDDI_ADDR_LEN);
queue_it:
if (hdrcmplt)
bcopy((caddr_t)esrc, (caddr_t)fh->fddi_shost, FDDI_ADDR_LEN);
else
bcopy(IF_LLADDR(ifp), (caddr_t)fh->fddi_shost,
FDDI_ADDR_LEN);
/*
* If a simplex interface, and the packet is being sent to our
* Ethernet address or a broadcast address, loopback a copy.
* XXX To make a simplex device behave exactly like a duplex
* device, we should copy in the case of sending to our own
* ethernet address (thus letting the original actually appear
* on the wire). However, we don't do that here for security
* reasons and compatibility with the original behavior.
*/
if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) {
if ((m->m_flags & M_BCAST) || (loop_copy > 0)) {
struct mbuf *n;
n = m_copy(m, 0, (int)M_COPYALL);
(void) if_simloop(ifp, n, dst->sa_family,
FDDI_HDR_LEN);
} else if (bcmp(fh->fddi_dhost, fh->fddi_shost,
FDDI_ADDR_LEN) == 0) {
(void) if_simloop(ifp, m, dst->sa_family,
FDDI_HDR_LEN);
return (0); /* XXX */
}
}
error = (ifp->if_transmit)(ifp, m);
if (error)
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
return (error);
bad:
if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
if (m)
m_freem(m);
return (error);
}
/*
* Process a received FDDI packet.
*/
static void
fddi_input(ifp, m)
struct ifnet *ifp;
struct mbuf *m;
{
int isr;
struct llc *l;
struct fddi_header *fh;
/*
* Do consistency checks to verify assumptions
* made by code past this point.
*/
if ((m->m_flags & M_PKTHDR) == 0) {
if_printf(ifp, "discard frame w/o packet header\n");
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
m_freem(m);
return;
}
if (m->m_pkthdr.rcvif == NULL) {
if_printf(ifp, "discard frame w/o interface pointer\n");
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
m_freem(m);
return;
}
m = m_pullup(m, FDDI_HDR_LEN);
if (m == NULL) {
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
goto dropanyway;
}
fh = mtod(m, struct fddi_header *);
/*
* Discard packet if interface is not up.
*/
if (!((ifp->if_flags & IFF_UP) &&
(ifp->if_drv_flags & IFF_DRV_RUNNING)))
goto dropanyway;
/*
* Give bpf a chance at the packet.
*/
BPF_MTAP(ifp, m);
/*
* Interface marked for monitoring; discard packet.
*/
if (ifp->if_flags & IFF_MONITOR) {
m_freem(m);
return;
}
#ifdef MAC
mac_ifnet_create_mbuf(ifp, m);
#endif
/*
* Update interface statistics.
*/
if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
getmicrotime(&ifp->if_lastchange);
/*
* Discard non local unicast packets when interface
* is in promiscuous mode.
*/
if ((ifp->if_flags & IFF_PROMISC) && ((fh->fddi_dhost[0] & 1) == 0) &&
(bcmp(IF_LLADDR(ifp), (caddr_t)fh->fddi_dhost,
FDDI_ADDR_LEN) != 0))
goto dropanyway;
/*
* Set mbuf flags for bcast/mcast.
*/
if (fh->fddi_dhost[0] & 1) {
if (bcmp(ifp->if_broadcastaddr, fh->fddi_dhost,
FDDI_ADDR_LEN) == 0)
m->m_flags |= M_BCAST;
else
m->m_flags |= M_MCAST;
if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
}
#ifdef M_LINK0
/*
* If this has a LLC priority of 0, then mark it so upper
* layers have a hint that it really came via a FDDI/Ethernet
* bridge.
*/
if ((fh->fddi_fc & FDDIFC_LLC_PRIO7) == FDDIFC_LLC_PRIO0)
m->m_flags |= M_LINK0;
#endif
/* Strip off FDDI header. */
m_adj(m, FDDI_HDR_LEN);
m = m_pullup(m, LLC_SNAPFRAMELEN);
if (m == 0) {
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
goto dropanyway;
}
l = mtod(m, struct llc *);
switch (l->llc_dsap) {
case LLC_SNAP_LSAP:
{
u_int16_t type;
if ((l->llc_control != LLC_UI) ||
(l->llc_ssap != LLC_SNAP_LSAP)) {
if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
goto dropanyway;
}
if (l->llc_snap.org_code[0] != 0 ||
l->llc_snap.org_code[1] != 0 ||
l->llc_snap.org_code[2] != 0) {
if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
goto dropanyway;
}
type = ntohs(l->llc_snap.ether_type);
m_adj(m, LLC_SNAPFRAMELEN);
switch (type) {
#ifdef INET
case ETHERTYPE_IP:
isr = NETISR_IP;
break;
case ETHERTYPE_ARP:
if (ifp->if_flags & IFF_NOARP)
goto dropanyway;
isr = NETISR_ARP;
break;
#endif
#ifdef INET6
case ETHERTYPE_IPV6:
isr = NETISR_IPV6;
break;
#endif
#ifdef DECNET
case ETHERTYPE_DECNET:
isr = NETISR_DECNET;
break;
#endif
default:
/* printf("fddi_input: unknown protocol 0x%x\n", type); */
if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
goto dropanyway;
}
break;
}
default:
/* printf("fddi_input: unknown dsap 0x%x\n", l->llc_dsap); */
if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
goto dropanyway;
}
M_SETFIB(m, ifp->if_fib);
netisr_dispatch(isr, m);
return;
dropanyway:
if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
if (m)
m_freem(m);
return;
}
/*
* Perform common duties while attaching to interface list
*/
void
fddi_ifattach(ifp, lla, bpf)
struct ifnet *ifp;
const u_int8_t *lla;
int bpf;
{
struct ifaddr *ifa;
struct sockaddr_dl *sdl;
ifp->if_type = IFT_FDDI;
ifp->if_addrlen = FDDI_ADDR_LEN;
ifp->if_hdrlen = 21;
if_attach(ifp); /* Must be called before additional assignments */
ifp->if_mtu = FDDIMTU;
ifp->if_output = fddi_output;
ifp->if_input = fddi_input;
ifp->if_resolvemulti = fddi_resolvemulti;
ifp->if_broadcastaddr = fddibroadcastaddr;
ifp->if_baudrate = 100000000;
#ifdef IFF_NOTRAILERS
ifp->if_flags |= IFF_NOTRAILERS;
#endif
ifa = ifp->if_addr;
KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
sdl->sdl_type = IFT_FDDI;
sdl->sdl_alen = ifp->if_addrlen;
bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
if (bpf)
bpfattach(ifp, DLT_FDDI, FDDI_HDR_LEN);
return;
}
void
fddi_ifdetach(ifp, bpf)
struct ifnet *ifp;
int bpf;
{
if (bpf)
bpfdetach(ifp);
if_detach(ifp);
return;
}
int
fddi_ioctl (ifp, command, data)
struct ifnet *ifp;
u_long command;
caddr_t data;
{
struct ifaddr *ifa;
struct ifreq *ifr;
int error;
ifa = (struct ifaddr *) data;
ifr = (struct ifreq *) data;
error = 0;
switch (command) {
case SIOCSIFADDR:
ifp->if_flags |= IFF_UP;
switch (ifa->ifa_addr->sa_family) {
#ifdef INET
case AF_INET: /* before arpwhohas */
ifp->if_init(ifp->if_softc);
arp_ifinit(ifp, ifa);
break;
#endif
default:
ifp->if_init(ifp->if_softc);
break;
}
break;
case SIOCGIFADDR: {
struct sockaddr *sa;
sa = (struct sockaddr *) & ifr->ifr_data;
bcopy(IF_LLADDR(ifp),
(caddr_t) sa->sa_data, FDDI_ADDR_LEN);
}
break;
case SIOCSIFMTU:
/*
* Set the interface MTU.
*/
if (ifr->ifr_mtu > FDDIMTU) {
error = EINVAL;
} else {
ifp->if_mtu = ifr->ifr_mtu;
}
break;
default:
error = EINVAL;
break;
}
return (error);
}
static int
fddi_resolvemulti(ifp, llsa, sa)
struct ifnet *ifp;
struct sockaddr **llsa;
struct sockaddr *sa;
{
struct sockaddr_dl *sdl;
#ifdef INET
struct sockaddr_in *sin;
#endif
#ifdef INET6
struct sockaddr_in6 *sin6;
#endif
u_char *e_addr;
switch(sa->sa_family) {
case AF_LINK:
/*
* No mapping needed. Just check that it's a valid MC address.
*/
sdl = (struct sockaddr_dl *)sa;
e_addr = LLADDR(sdl);
if ((e_addr[0] & 1) != 1)
return (EADDRNOTAVAIL);
*llsa = 0;
return (0);
#ifdef INET
case AF_INET:
sin = (struct sockaddr_in *)sa;
if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr)))
return (EADDRNOTAVAIL);
sdl = link_init_sdl(ifp, *llsa, IFT_FDDI);
sdl->sdl_nlen = 0;
sdl->sdl_alen = FDDI_ADDR_LEN;
sdl->sdl_slen = 0;
e_addr = LLADDR(sdl);
ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr);
*llsa = (struct sockaddr *)sdl;
return (0);
#endif
#ifdef INET6
case AF_INET6:
sin6 = (struct sockaddr_in6 *)sa;
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
/*
* An IP6 address of 0 means listen to all
* of the Ethernet multicast address used for IP6.
* (This is used for multicast routers.)
*/
ifp->if_flags |= IFF_ALLMULTI;
*llsa = 0;
return (0);
}
if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
return (EADDRNOTAVAIL);
sdl = link_init_sdl(ifp, *llsa, IFT_FDDI);
sdl->sdl_nlen = 0;
sdl->sdl_alen = FDDI_ADDR_LEN;
sdl->sdl_slen = 0;
e_addr = LLADDR(sdl);
ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr);
*llsa = (struct sockaddr *)sdl;
return (0);
#endif
default:
/*
* Well, the text isn't quite right, but it's the name
* that counts...
*/
return (EAFNOSUPPORT);
}
return (0);
}
static moduledata_t fddi_mod = {
"fddi", /* module name */
NULL, /* event handler */
0 /* extra data */
};
DECLARE_MODULE(fddi, fddi_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
MODULE_VERSION(fddi, 1);