d75e0c471e
but removed due to other changes in the system. Restore the llentry pointer to the "struct route", and use it to cache the L2 lookup (ARP or ND6) as appropriate. Submitted by: Mike Karels Differential Revision: https://reviews.freebsd.org/D6262
1229 lines
30 KiB
C
1229 lines
30 KiB
C
/*-
|
|
* 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.
|
|
* 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.
|
|
*
|
|
* @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include "opt_inet.h"
|
|
#include "opt_inet6.h"
|
|
#include "opt_netgraph.h"
|
|
#include "opt_mbuf_profiling.h"
|
|
#include "opt_rss.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/random.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/sockio.h>
|
|
#include <sys/sysctl.h>
|
|
#include <sys/uuid.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_var.h>
|
|
#include <net/if_arp.h>
|
|
#include <net/netisr.h>
|
|
#include <net/route.h>
|
|
#include <net/if_llc.h>
|
|
#include <net/if_dl.h>
|
|
#include <net/if_types.h>
|
|
#include <net/bpf.h>
|
|
#include <net/ethernet.h>
|
|
#include <net/if_bridgevar.h>
|
|
#include <net/if_vlan_var.h>
|
|
#include <net/if_llatbl.h>
|
|
#include <net/pfil.h>
|
|
#include <net/rss_config.h>
|
|
#include <net/vnet.h>
|
|
|
|
#include <netpfil/pf/pf_mtag.h>
|
|
|
|
#if defined(INET) || defined(INET6)
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_var.h>
|
|
#include <netinet/if_ether.h>
|
|
#include <netinet/ip_carp.h>
|
|
#include <netinet/ip_var.h>
|
|
#endif
|
|
#ifdef INET6
|
|
#include <netinet6/nd6.h>
|
|
#endif
|
|
#include <security/mac/mac_framework.h>
|
|
|
|
#ifdef CTASSERT
|
|
CTASSERT(sizeof (struct ether_header) == ETHER_ADDR_LEN * 2 + 2);
|
|
CTASSERT(sizeof (struct ether_addr) == ETHER_ADDR_LEN);
|
|
#endif
|
|
|
|
VNET_DEFINE(struct pfil_head, link_pfil_hook); /* Packet filter hooks */
|
|
|
|
/* netgraph node hooks for ng_ether(4) */
|
|
void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
|
|
void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
|
|
int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
|
|
void (*ng_ether_attach_p)(struct ifnet *ifp);
|
|
void (*ng_ether_detach_p)(struct ifnet *ifp);
|
|
|
|
void (*vlan_input_p)(struct ifnet *, struct mbuf *);
|
|
|
|
/* if_bridge(4) support */
|
|
struct mbuf *(*bridge_input_p)(struct ifnet *, struct mbuf *);
|
|
int (*bridge_output_p)(struct ifnet *, struct mbuf *,
|
|
struct sockaddr *, struct rtentry *);
|
|
void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
|
|
|
|
/* if_lagg(4) support */
|
|
struct mbuf *(*lagg_input_p)(struct ifnet *, struct mbuf *);
|
|
|
|
static const u_char etherbroadcastaddr[ETHER_ADDR_LEN] =
|
|
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
|
|
|
|
static int ether_resolvemulti(struct ifnet *, struct sockaddr **,
|
|
struct sockaddr *);
|
|
#ifdef VIMAGE
|
|
static void ether_reassign(struct ifnet *, struct vnet *, char *);
|
|
#endif
|
|
static int ether_requestencap(struct ifnet *, struct if_encap_req *);
|
|
|
|
#define ETHER_IS_BROADCAST(addr) \
|
|
(bcmp(etherbroadcastaddr, (addr), ETHER_ADDR_LEN) == 0)
|
|
|
|
#define senderr(e) do { error = (e); goto bad;} while (0)
|
|
|
|
static void
|
|
update_mbuf_csumflags(struct mbuf *src, struct mbuf *dst)
|
|
{
|
|
int csum_flags = 0;
|
|
|
|
if (src->m_pkthdr.csum_flags & CSUM_IP)
|
|
csum_flags |= (CSUM_IP_CHECKED|CSUM_IP_VALID);
|
|
if (src->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
|
|
csum_flags |= (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
|
|
if (src->m_pkthdr.csum_flags & CSUM_SCTP)
|
|
csum_flags |= CSUM_SCTP_VALID;
|
|
dst->m_pkthdr.csum_flags |= csum_flags;
|
|
if (csum_flags & CSUM_DATA_VALID)
|
|
dst->m_pkthdr.csum_data = 0xffff;
|
|
}
|
|
|
|
/*
|
|
* Handle link-layer encapsulation requests.
|
|
*/
|
|
static int
|
|
ether_requestencap(struct ifnet *ifp, struct if_encap_req *req)
|
|
{
|
|
struct ether_header *eh;
|
|
struct arphdr *ah;
|
|
uint16_t etype;
|
|
const u_char *lladdr;
|
|
|
|
if (req->rtype != IFENCAP_LL)
|
|
return (EOPNOTSUPP);
|
|
|
|
if (req->bufsize < ETHER_HDR_LEN)
|
|
return (ENOMEM);
|
|
|
|
eh = (struct ether_header *)req->buf;
|
|
lladdr = req->lladdr;
|
|
req->lladdr_off = 0;
|
|
|
|
switch (req->family) {
|
|
case AF_INET:
|
|
etype = htons(ETHERTYPE_IP);
|
|
break;
|
|
case AF_INET6:
|
|
etype = htons(ETHERTYPE_IPV6);
|
|
break;
|
|
case AF_ARP:
|
|
ah = (struct arphdr *)req->hdata;
|
|
ah->ar_hrd = htons(ARPHRD_ETHER);
|
|
|
|
switch(ntohs(ah->ar_op)) {
|
|
case ARPOP_REVREQUEST:
|
|
case ARPOP_REVREPLY:
|
|
etype = htons(ETHERTYPE_REVARP);
|
|
break;
|
|
case ARPOP_REQUEST:
|
|
case ARPOP_REPLY:
|
|
default:
|
|
etype = htons(ETHERTYPE_ARP);
|
|
break;
|
|
}
|
|
|
|
if (req->flags & IFENCAP_FLAG_BROADCAST)
|
|
lladdr = ifp->if_broadcastaddr;
|
|
break;
|
|
default:
|
|
return (EAFNOSUPPORT);
|
|
}
|
|
|
|
memcpy(&eh->ether_type, &etype, sizeof(eh->ether_type));
|
|
memcpy(eh->ether_dhost, lladdr, ETHER_ADDR_LEN);
|
|
memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
|
|
req->bufsize = sizeof(struct ether_header);
|
|
|
|
return (0);
|
|
}
|
|
|
|
|
|
static int
|
|
ether_resolve_addr(struct ifnet *ifp, struct mbuf *m,
|
|
const struct sockaddr *dst, struct route *ro, u_char *phdr,
|
|
uint32_t *pflags, struct llentry **plle)
|
|
{
|
|
struct ether_header *eh;
|
|
uint32_t lleflags = 0;
|
|
int error = 0;
|
|
#if defined(INET) || defined(INET6)
|
|
uint16_t etype;
|
|
#endif
|
|
|
|
if (plle)
|
|
*plle = NULL;
|
|
eh = (struct ether_header *)phdr;
|
|
|
|
switch (dst->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
if ((m->m_flags & (M_BCAST | M_MCAST)) == 0)
|
|
error = arpresolve(ifp, 0, m, dst, phdr, &lleflags,
|
|
plle);
|
|
else {
|
|
if (m->m_flags & M_BCAST)
|
|
memcpy(eh->ether_dhost, ifp->if_broadcastaddr,
|
|
ETHER_ADDR_LEN);
|
|
else {
|
|
const struct in_addr *a;
|
|
a = &(((const struct sockaddr_in *)dst)->sin_addr);
|
|
ETHER_MAP_IP_MULTICAST(a, eh->ether_dhost);
|
|
}
|
|
etype = htons(ETHERTYPE_IP);
|
|
memcpy(&eh->ether_type, &etype, sizeof(etype));
|
|
memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
|
|
}
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if ((m->m_flags & M_MCAST) == 0)
|
|
error = nd6_resolve(ifp, 0, m, dst, phdr, &lleflags,
|
|
plle);
|
|
else {
|
|
const struct in6_addr *a6;
|
|
a6 = &(((const struct sockaddr_in6 *)dst)->sin6_addr);
|
|
ETHER_MAP_IPV6_MULTICAST(a6, eh->ether_dhost);
|
|
etype = htons(ETHERTYPE_IPV6);
|
|
memcpy(&eh->ether_type, &etype, sizeof(etype));
|
|
memcpy(eh->ether_shost, IF_LLADDR(ifp), ETHER_ADDR_LEN);
|
|
}
|
|
break;
|
|
#endif
|
|
default:
|
|
if_printf(ifp, "can't handle af%d\n", dst->sa_family);
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
return (EAFNOSUPPORT);
|
|
}
|
|
|
|
if (error == EHOSTDOWN) {
|
|
if (ro != NULL && (ro->ro_flags & RT_HAS_GW) != 0)
|
|
error = EHOSTUNREACH;
|
|
}
|
|
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
*pflags = RT_MAY_LOOP;
|
|
if (lleflags & LLE_IFADDR)
|
|
*pflags |= RT_L2_ME;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Ethernet 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.
|
|
*/
|
|
int
|
|
ether_output(struct ifnet *ifp, struct mbuf *m,
|
|
const struct sockaddr *dst, struct route *ro)
|
|
{
|
|
int error = 0;
|
|
char linkhdr[ETHER_HDR_LEN], *phdr;
|
|
struct ether_header *eh;
|
|
struct pf_mtag *t;
|
|
int loop_copy = 1;
|
|
int hlen; /* link layer header length */
|
|
uint32_t pflags;
|
|
struct llentry *lle = NULL;
|
|
struct rtentry *rt0 = NULL;
|
|
int addref = 0;
|
|
|
|
phdr = NULL;
|
|
pflags = 0;
|
|
if (ro != NULL) {
|
|
/* XXX BPF uses ro_prepend */
|
|
if (ro->ro_prepend != NULL) {
|
|
phdr = ro->ro_prepend;
|
|
hlen = ro->ro_plen;
|
|
} else if (!(m->m_flags & (M_BCAST | M_MCAST))) {
|
|
if ((ro->ro_flags & RT_LLE_CACHE) != 0) {
|
|
lle = ro->ro_lle;
|
|
if (lle != NULL &&
|
|
(lle->la_flags & LLE_VALID) == 0) {
|
|
LLE_FREE(lle);
|
|
lle = NULL; /* redundant */
|
|
ro->ro_lle = NULL;
|
|
}
|
|
if (lle == NULL) {
|
|
/* if we lookup, keep cache */
|
|
addref = 1;
|
|
}
|
|
}
|
|
if (lle != NULL) {
|
|
phdr = lle->r_linkdata;
|
|
hlen = lle->r_hdrlen;
|
|
pflags = lle->r_flags;
|
|
}
|
|
}
|
|
rt0 = ro->ro_rt;
|
|
}
|
|
|
|
#ifdef MAC
|
|
error = mac_ifnet_check_transmit(ifp, m);
|
|
if (error)
|
|
senderr(error);
|
|
#endif
|
|
|
|
M_PROFILE(m);
|
|
if (ifp->if_flags & IFF_MONITOR)
|
|
senderr(ENETDOWN);
|
|
if (!((ifp->if_flags & IFF_UP) &&
|
|
(ifp->if_drv_flags & IFF_DRV_RUNNING)))
|
|
senderr(ENETDOWN);
|
|
|
|
if (phdr == NULL) {
|
|
/* No prepend data supplied. Try to calculate ourselves. */
|
|
phdr = linkhdr;
|
|
hlen = ETHER_HDR_LEN;
|
|
error = ether_resolve_addr(ifp, m, dst, ro, phdr, &pflags,
|
|
addref ? &lle : NULL);
|
|
if (addref && lle != NULL)
|
|
ro->ro_lle = lle;
|
|
if (error != 0)
|
|
return (error == EWOULDBLOCK ? 0 : error);
|
|
}
|
|
|
|
if ((pflags & RT_L2_ME) != 0) {
|
|
update_mbuf_csumflags(m, m);
|
|
return (if_simloop(ifp, m, dst->sa_family, 0));
|
|
}
|
|
loop_copy = pflags & RT_MAY_LOOP;
|
|
|
|
/*
|
|
* Add local net header. If no space in first mbuf,
|
|
* allocate another.
|
|
*
|
|
* Note that we do prepend regardless of RT_HAS_HEADER flag.
|
|
* This is done because BPF code shifts m_data pointer
|
|
* to the end of ethernet header prior to calling if_output().
|
|
*/
|
|
M_PREPEND(m, hlen, M_NOWAIT);
|
|
if (m == NULL)
|
|
senderr(ENOBUFS);
|
|
if ((pflags & RT_HAS_HEADER) == 0) {
|
|
eh = mtod(m, struct ether_header *);
|
|
memcpy(eh, phdr, hlen);
|
|
}
|
|
|
|
/*
|
|
* 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 ((m->m_flags & M_BCAST) && loop_copy && (ifp->if_flags & IFF_SIMPLEX) &&
|
|
((t = pf_find_mtag(m)) == NULL || !t->routed)) {
|
|
struct mbuf *n;
|
|
|
|
/*
|
|
* Because if_simloop() modifies the packet, we need a
|
|
* writable copy through m_dup() instead of a readonly
|
|
* one as m_copy[m] would give us. The alternative would
|
|
* be to modify if_simloop() to handle the readonly mbuf,
|
|
* but performancewise it is mostly equivalent (trading
|
|
* extra data copying vs. extra locking).
|
|
*
|
|
* XXX This is a local workaround. A number of less
|
|
* often used kernel parts suffer from the same bug.
|
|
* See PR kern/105943 for a proposed general solution.
|
|
*/
|
|
if ((n = m_dup(m, M_NOWAIT)) != NULL) {
|
|
update_mbuf_csumflags(m, n);
|
|
(void)if_simloop(ifp, n, dst->sa_family, hlen);
|
|
} else
|
|
if_inc_counter(ifp, IFCOUNTER_IQDROPS, 1);
|
|
}
|
|
|
|
/*
|
|
* Bridges require special output handling.
|
|
*/
|
|
if (ifp->if_bridge) {
|
|
BRIDGE_OUTPUT(ifp, m, error);
|
|
return (error);
|
|
}
|
|
|
|
#if defined(INET) || defined(INET6)
|
|
if (ifp->if_carp &&
|
|
(error = (*carp_output_p)(ifp, m, dst)))
|
|
goto bad;
|
|
#endif
|
|
|
|
/* Handle ng_ether(4) processing, if any */
|
|
if (ifp->if_l2com != NULL) {
|
|
KASSERT(ng_ether_output_p != NULL,
|
|
("ng_ether_output_p is NULL"));
|
|
if ((error = (*ng_ether_output_p)(ifp, &m)) != 0) {
|
|
bad: if (m != NULL)
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
if (m == NULL)
|
|
return (0);
|
|
}
|
|
|
|
/* Continue with link-layer output */
|
|
return ether_output_frame(ifp, m);
|
|
}
|
|
|
|
/*
|
|
* Ethernet link layer output routine to send a raw frame to the device.
|
|
*
|
|
* This assumes that the 14 byte Ethernet header is present and contiguous
|
|
* in the first mbuf (if BRIDGE'ing).
|
|
*/
|
|
int
|
|
ether_output_frame(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
int i;
|
|
|
|
if (PFIL_HOOKED(&V_link_pfil_hook)) {
|
|
i = pfil_run_hooks(&V_link_pfil_hook, &m, ifp, PFIL_OUT, NULL);
|
|
|
|
if (i != 0)
|
|
return (EACCES);
|
|
|
|
if (m == NULL)
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Queue message on interface, update output statistics if
|
|
* successful, and start output if interface not yet active.
|
|
*/
|
|
return ((ifp->if_transmit)(ifp, m));
|
|
}
|
|
|
|
/*
|
|
* Process a received Ethernet packet; the packet is in the
|
|
* mbuf chain m with the ethernet header at the front.
|
|
*/
|
|
static void
|
|
ether_input_internal(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct ether_header *eh;
|
|
u_short etype;
|
|
|
|
if ((ifp->if_flags & IFF_UP) == 0) {
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
#ifdef DIAGNOSTIC
|
|
if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
|
|
if_printf(ifp, "discard frame at !IFF_DRV_RUNNING\n");
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
#endif
|
|
if (m->m_len < ETHER_HDR_LEN) {
|
|
/* XXX maybe should pullup? */
|
|
if_printf(ifp, "discard frame w/o leading ethernet "
|
|
"header (len %u pkt len %u)\n",
|
|
m->m_len, m->m_pkthdr.len);
|
|
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
eh = mtod(m, struct ether_header *);
|
|
etype = ntohs(eh->ether_type);
|
|
random_harvest_queue(m, sizeof(*m), 2, RANDOM_NET_ETHER);
|
|
|
|
CURVNET_SET_QUIET(ifp->if_vnet);
|
|
|
|
if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
|
|
if (ETHER_IS_BROADCAST(eh->ether_dhost))
|
|
m->m_flags |= M_BCAST;
|
|
else
|
|
m->m_flags |= M_MCAST;
|
|
if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
|
|
}
|
|
|
|
#ifdef MAC
|
|
/*
|
|
* Tag the mbuf with an appropriate MAC label before any other
|
|
* consumers can get to it.
|
|
*/
|
|
mac_ifnet_create_mbuf(ifp, m);
|
|
#endif
|
|
|
|
/*
|
|
* Give bpf a chance at the packet.
|
|
*/
|
|
ETHER_BPF_MTAP(ifp, m);
|
|
|
|
/*
|
|
* If the CRC is still on the packet, trim it off. We do this once
|
|
* and once only in case we are re-entered. Nothing else on the
|
|
* Ethernet receive path expects to see the FCS.
|
|
*/
|
|
if (m->m_flags & M_HASFCS) {
|
|
m_adj(m, -ETHER_CRC_LEN);
|
|
m->m_flags &= ~M_HASFCS;
|
|
}
|
|
|
|
if (!(ifp->if_capenable & IFCAP_HWSTATS))
|
|
if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
|
|
|
|
/* Allow monitor mode to claim this frame, after stats are updated. */
|
|
if (ifp->if_flags & IFF_MONITOR) {
|
|
m_freem(m);
|
|
CURVNET_RESTORE();
|
|
return;
|
|
}
|
|
|
|
/* Handle input from a lagg(4) port */
|
|
if (ifp->if_type == IFT_IEEE8023ADLAG) {
|
|
KASSERT(lagg_input_p != NULL,
|
|
("%s: if_lagg not loaded!", __func__));
|
|
m = (*lagg_input_p)(ifp, m);
|
|
if (m != NULL)
|
|
ifp = m->m_pkthdr.rcvif;
|
|
else {
|
|
CURVNET_RESTORE();
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If the hardware did not process an 802.1Q tag, do this now,
|
|
* to allow 802.1P priority frames to be passed to the main input
|
|
* path correctly.
|
|
* TODO: Deal with Q-in-Q frames, but not arbitrary nesting levels.
|
|
*/
|
|
if ((m->m_flags & M_VLANTAG) == 0 && etype == ETHERTYPE_VLAN) {
|
|
struct ether_vlan_header *evl;
|
|
|
|
if (m->m_len < sizeof(*evl) &&
|
|
(m = m_pullup(m, sizeof(*evl))) == NULL) {
|
|
#ifdef DIAGNOSTIC
|
|
if_printf(ifp, "cannot pullup VLAN header\n");
|
|
#endif
|
|
if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
|
|
CURVNET_RESTORE();
|
|
return;
|
|
}
|
|
|
|
evl = mtod(m, struct ether_vlan_header *);
|
|
m->m_pkthdr.ether_vtag = ntohs(evl->evl_tag);
|
|
m->m_flags |= M_VLANTAG;
|
|
|
|
bcopy((char *)evl, (char *)evl + ETHER_VLAN_ENCAP_LEN,
|
|
ETHER_HDR_LEN - ETHER_TYPE_LEN);
|
|
m_adj(m, ETHER_VLAN_ENCAP_LEN);
|
|
eh = mtod(m, struct ether_header *);
|
|
}
|
|
|
|
M_SETFIB(m, ifp->if_fib);
|
|
|
|
/* Allow ng_ether(4) to claim this frame. */
|
|
if (ifp->if_l2com != NULL) {
|
|
KASSERT(ng_ether_input_p != NULL,
|
|
("%s: ng_ether_input_p is NULL", __func__));
|
|
m->m_flags &= ~M_PROMISC;
|
|
(*ng_ether_input_p)(ifp, &m);
|
|
if (m == NULL) {
|
|
CURVNET_RESTORE();
|
|
return;
|
|
}
|
|
eh = mtod(m, struct ether_header *);
|
|
}
|
|
|
|
/*
|
|
* Allow if_bridge(4) to claim this frame.
|
|
* The BRIDGE_INPUT() macro will update ifp if the bridge changed it
|
|
* and the frame should be delivered locally.
|
|
*/
|
|
if (ifp->if_bridge != NULL) {
|
|
m->m_flags &= ~M_PROMISC;
|
|
BRIDGE_INPUT(ifp, m);
|
|
if (m == NULL) {
|
|
CURVNET_RESTORE();
|
|
return;
|
|
}
|
|
eh = mtod(m, struct ether_header *);
|
|
}
|
|
|
|
#if defined(INET) || defined(INET6)
|
|
/*
|
|
* Clear M_PROMISC on frame so that carp(4) will see it when the
|
|
* mbuf flows up to Layer 3.
|
|
* FreeBSD's implementation of carp(4) uses the inprotosw
|
|
* to dispatch IPPROTO_CARP. carp(4) also allocates its own
|
|
* Ethernet addresses of the form 00:00:5e:00:01:xx, which
|
|
* is outside the scope of the M_PROMISC test below.
|
|
* TODO: Maintain a hash table of ethernet addresses other than
|
|
* ether_dhost which may be active on this ifp.
|
|
*/
|
|
if (ifp->if_carp && (*carp_forus_p)(ifp, eh->ether_dhost)) {
|
|
m->m_flags &= ~M_PROMISC;
|
|
} else
|
|
#endif
|
|
{
|
|
/*
|
|
* If the frame received was not for our MAC address, set the
|
|
* M_PROMISC flag on the mbuf chain. The frame may need to
|
|
* be seen by the rest of the Ethernet input path in case of
|
|
* re-entry (e.g. bridge, vlan, netgraph) but should not be
|
|
* seen by upper protocol layers.
|
|
*/
|
|
if (!ETHER_IS_MULTICAST(eh->ether_dhost) &&
|
|
bcmp(IF_LLADDR(ifp), eh->ether_dhost, ETHER_ADDR_LEN) != 0)
|
|
m->m_flags |= M_PROMISC;
|
|
}
|
|
|
|
ether_demux(ifp, m);
|
|
CURVNET_RESTORE();
|
|
}
|
|
|
|
/*
|
|
* Ethernet input dispatch; by default, direct dispatch here regardless of
|
|
* global configuration. However, if RSS is enabled, hook up RSS affinity
|
|
* so that when deferred or hybrid dispatch is enabled, we can redistribute
|
|
* load based on RSS.
|
|
*
|
|
* XXXRW: Would be nice if the ifnet passed up a flag indicating whether or
|
|
* not it had already done work distribution via multi-queue. Then we could
|
|
* direct dispatch in the event load balancing was already complete and
|
|
* handle the case of interfaces with different capabilities better.
|
|
*
|
|
* XXXRW: Sort of want an M_DISTRIBUTED flag to avoid multiple distributions
|
|
* at multiple layers?
|
|
*
|
|
* XXXRW: For now, enable all this only if RSS is compiled in, although it
|
|
* works fine without RSS. Need to characterise the performance overhead
|
|
* of the detour through the netisr code in the event the result is always
|
|
* direct dispatch.
|
|
*/
|
|
static void
|
|
ether_nh_input(struct mbuf *m)
|
|
{
|
|
|
|
M_ASSERTPKTHDR(m);
|
|
KASSERT(m->m_pkthdr.rcvif != NULL,
|
|
("%s: NULL interface pointer", __func__));
|
|
ether_input_internal(m->m_pkthdr.rcvif, m);
|
|
}
|
|
|
|
static struct netisr_handler ether_nh = {
|
|
.nh_name = "ether",
|
|
.nh_handler = ether_nh_input,
|
|
.nh_proto = NETISR_ETHER,
|
|
#ifdef RSS
|
|
.nh_policy = NETISR_POLICY_CPU,
|
|
.nh_dispatch = NETISR_DISPATCH_DIRECT,
|
|
.nh_m2cpuid = rss_m2cpuid,
|
|
#else
|
|
.nh_policy = NETISR_POLICY_SOURCE,
|
|
.nh_dispatch = NETISR_DISPATCH_DIRECT,
|
|
#endif
|
|
};
|
|
|
|
static void
|
|
ether_init(__unused void *arg)
|
|
{
|
|
|
|
netisr_register(ðer_nh);
|
|
}
|
|
SYSINIT(ether, SI_SUB_INIT_IF, SI_ORDER_ANY, ether_init, NULL);
|
|
|
|
static void
|
|
vnet_ether_init(__unused void *arg)
|
|
{
|
|
int i;
|
|
|
|
/* Initialize packet filter hooks. */
|
|
V_link_pfil_hook.ph_type = PFIL_TYPE_AF;
|
|
V_link_pfil_hook.ph_af = AF_LINK;
|
|
if ((i = pfil_head_register(&V_link_pfil_hook)) != 0)
|
|
printf("%s: WARNING: unable to register pfil link hook, "
|
|
"error %d\n", __func__, i);
|
|
}
|
|
VNET_SYSINIT(vnet_ether_init, SI_SUB_PROTO_IF, SI_ORDER_ANY,
|
|
vnet_ether_init, NULL);
|
|
|
|
static void
|
|
vnet_ether_destroy(__unused void *arg)
|
|
{
|
|
int i;
|
|
|
|
if ((i = pfil_head_unregister(&V_link_pfil_hook)) != 0)
|
|
printf("%s: WARNING: unable to unregister pfil link hook, "
|
|
"error %d\n", __func__, i);
|
|
}
|
|
VNET_SYSUNINIT(vnet_ether_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY,
|
|
vnet_ether_destroy, NULL);
|
|
|
|
|
|
|
|
static void
|
|
ether_input(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
|
|
struct mbuf *mn;
|
|
|
|
/*
|
|
* The drivers are allowed to pass in a chain of packets linked with
|
|
* m_nextpkt. We split them up into separate packets here and pass
|
|
* them up. This allows the drivers to amortize the receive lock.
|
|
*/
|
|
while (m) {
|
|
mn = m->m_nextpkt;
|
|
m->m_nextpkt = NULL;
|
|
|
|
/*
|
|
* We will rely on rcvif being set properly in the deferred context,
|
|
* so assert it is correct here.
|
|
*/
|
|
KASSERT(m->m_pkthdr.rcvif == ifp, ("%s: ifnet mismatch", __func__));
|
|
netisr_dispatch(NETISR_ETHER, m);
|
|
m = mn;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Upper layer processing for a received Ethernet packet.
|
|
*/
|
|
void
|
|
ether_demux(struct ifnet *ifp, struct mbuf *m)
|
|
{
|
|
struct ether_header *eh;
|
|
int i, isr;
|
|
u_short ether_type;
|
|
|
|
KASSERT(ifp != NULL, ("%s: NULL interface pointer", __func__));
|
|
|
|
/* Do not grab PROMISC frames in case we are re-entered. */
|
|
if (PFIL_HOOKED(&V_link_pfil_hook) && !(m->m_flags & M_PROMISC)) {
|
|
i = pfil_run_hooks(&V_link_pfil_hook, &m, ifp, PFIL_IN, NULL);
|
|
|
|
if (i != 0 || m == NULL)
|
|
return;
|
|
}
|
|
|
|
eh = mtod(m, struct ether_header *);
|
|
ether_type = ntohs(eh->ether_type);
|
|
|
|
/*
|
|
* If this frame has a VLAN tag other than 0, call vlan_input()
|
|
* if its module is loaded. Otherwise, drop.
|
|
*/
|
|
if ((m->m_flags & M_VLANTAG) &&
|
|
EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) != 0) {
|
|
if (ifp->if_vlantrunk == NULL) {
|
|
if_inc_counter(ifp, IFCOUNTER_NOPROTO, 1);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
KASSERT(vlan_input_p != NULL,("%s: VLAN not loaded!",
|
|
__func__));
|
|
/* Clear before possibly re-entering ether_input(). */
|
|
m->m_flags &= ~M_PROMISC;
|
|
(*vlan_input_p)(ifp, m);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Pass promiscuously received frames to the upper layer if the user
|
|
* requested this by setting IFF_PPROMISC. Otherwise, drop them.
|
|
*/
|
|
if ((ifp->if_flags & IFF_PPROMISC) == 0 && (m->m_flags & M_PROMISC)) {
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Reset layer specific mbuf flags to avoid confusing upper layers.
|
|
* Strip off Ethernet header.
|
|
*/
|
|
m->m_flags &= ~M_VLANTAG;
|
|
m_clrprotoflags(m);
|
|
m_adj(m, ETHER_HDR_LEN);
|
|
|
|
/*
|
|
* Dispatch frame to upper layer.
|
|
*/
|
|
switch (ether_type) {
|
|
#ifdef INET
|
|
case ETHERTYPE_IP:
|
|
isr = NETISR_IP;
|
|
break;
|
|
|
|
case ETHERTYPE_ARP:
|
|
if (ifp->if_flags & IFF_NOARP) {
|
|
/* Discard packet if ARP is disabled on interface */
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
isr = NETISR_ARP;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case ETHERTYPE_IPV6:
|
|
isr = NETISR_IPV6;
|
|
break;
|
|
#endif
|
|
default:
|
|
goto discard;
|
|
}
|
|
netisr_dispatch(isr, m);
|
|
return;
|
|
|
|
discard:
|
|
/*
|
|
* Packet is to be discarded. If netgraph is present,
|
|
* hand the packet to it for last chance processing;
|
|
* otherwise dispose of it.
|
|
*/
|
|
if (ifp->if_l2com != NULL) {
|
|
KASSERT(ng_ether_input_orphan_p != NULL,
|
|
("ng_ether_input_orphan_p is NULL"));
|
|
/*
|
|
* Put back the ethernet header so netgraph has a
|
|
* consistent view of inbound packets.
|
|
*/
|
|
M_PREPEND(m, ETHER_HDR_LEN, M_NOWAIT);
|
|
(*ng_ether_input_orphan_p)(ifp, m);
|
|
return;
|
|
}
|
|
m_freem(m);
|
|
}
|
|
|
|
/*
|
|
* Convert Ethernet address to printable (loggable) representation.
|
|
* This routine is for compatibility; it's better to just use
|
|
*
|
|
* printf("%6D", <pointer to address>, ":");
|
|
*
|
|
* since there's no static buffer involved.
|
|
*/
|
|
char *
|
|
ether_sprintf(const u_char *ap)
|
|
{
|
|
static char etherbuf[18];
|
|
snprintf(etherbuf, sizeof (etherbuf), "%6D", ap, ":");
|
|
return (etherbuf);
|
|
}
|
|
|
|
/*
|
|
* Perform common duties while attaching to interface list
|
|
*/
|
|
void
|
|
ether_ifattach(struct ifnet *ifp, const u_int8_t *lla)
|
|
{
|
|
int i;
|
|
struct ifaddr *ifa;
|
|
struct sockaddr_dl *sdl;
|
|
|
|
ifp->if_addrlen = ETHER_ADDR_LEN;
|
|
ifp->if_hdrlen = ETHER_HDR_LEN;
|
|
if_attach(ifp);
|
|
ifp->if_mtu = ETHERMTU;
|
|
ifp->if_output = ether_output;
|
|
ifp->if_input = ether_input;
|
|
ifp->if_resolvemulti = ether_resolvemulti;
|
|
ifp->if_requestencap = ether_requestencap;
|
|
#ifdef VIMAGE
|
|
ifp->if_reassign = ether_reassign;
|
|
#endif
|
|
if (ifp->if_baudrate == 0)
|
|
ifp->if_baudrate = IF_Mbps(10); /* just a default */
|
|
ifp->if_broadcastaddr = etherbroadcastaddr;
|
|
|
|
ifa = ifp->if_addr;
|
|
KASSERT(ifa != NULL, ("%s: no lladdr!\n", __func__));
|
|
sdl = (struct sockaddr_dl *)ifa->ifa_addr;
|
|
sdl->sdl_type = IFT_ETHER;
|
|
sdl->sdl_alen = ifp->if_addrlen;
|
|
bcopy(lla, LLADDR(sdl), ifp->if_addrlen);
|
|
|
|
bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
|
|
if (ng_ether_attach_p != NULL)
|
|
(*ng_ether_attach_p)(ifp);
|
|
|
|
/* Announce Ethernet MAC address if non-zero. */
|
|
for (i = 0; i < ifp->if_addrlen; i++)
|
|
if (lla[i] != 0)
|
|
break;
|
|
if (i != ifp->if_addrlen)
|
|
if_printf(ifp, "Ethernet address: %6D\n", lla, ":");
|
|
|
|
uuid_ether_add(LLADDR(sdl));
|
|
}
|
|
|
|
/*
|
|
* Perform common duties while detaching an Ethernet interface
|
|
*/
|
|
void
|
|
ether_ifdetach(struct ifnet *ifp)
|
|
{
|
|
struct sockaddr_dl *sdl;
|
|
|
|
sdl = (struct sockaddr_dl *)(ifp->if_addr->ifa_addr);
|
|
uuid_ether_del(LLADDR(sdl));
|
|
|
|
if (ifp->if_l2com != NULL) {
|
|
KASSERT(ng_ether_detach_p != NULL,
|
|
("ng_ether_detach_p is NULL"));
|
|
(*ng_ether_detach_p)(ifp);
|
|
}
|
|
|
|
bpfdetach(ifp);
|
|
if_detach(ifp);
|
|
}
|
|
|
|
#ifdef VIMAGE
|
|
void
|
|
ether_reassign(struct ifnet *ifp, struct vnet *new_vnet, char *unused __unused)
|
|
{
|
|
|
|
if (ifp->if_l2com != NULL) {
|
|
KASSERT(ng_ether_detach_p != NULL,
|
|
("ng_ether_detach_p is NULL"));
|
|
(*ng_ether_detach_p)(ifp);
|
|
}
|
|
|
|
if (ng_ether_attach_p != NULL) {
|
|
CURVNET_SET_QUIET(new_vnet);
|
|
(*ng_ether_attach_p)(ifp);
|
|
CURVNET_RESTORE();
|
|
}
|
|
}
|
|
#endif
|
|
|
|
SYSCTL_DECL(_net_link);
|
|
SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet");
|
|
|
|
#if 0
|
|
/*
|
|
* This is for reference. We have a table-driven version
|
|
* of the little-endian crc32 generator, which is faster
|
|
* than the double-loop.
|
|
*/
|
|
uint32_t
|
|
ether_crc32_le(const uint8_t *buf, size_t len)
|
|
{
|
|
size_t i;
|
|
uint32_t crc;
|
|
int bit;
|
|
uint8_t data;
|
|
|
|
crc = 0xffffffff; /* initial value */
|
|
|
|
for (i = 0; i < len; i++) {
|
|
for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
|
|
carry = (crc ^ data) & 1;
|
|
crc >>= 1;
|
|
if (carry)
|
|
crc = (crc ^ ETHER_CRC_POLY_LE);
|
|
}
|
|
}
|
|
|
|
return (crc);
|
|
}
|
|
#else
|
|
uint32_t
|
|
ether_crc32_le(const uint8_t *buf, size_t len)
|
|
{
|
|
static const uint32_t crctab[] = {
|
|
0x00000000, 0x1db71064, 0x3b6e20c8, 0x26d930ac,
|
|
0x76dc4190, 0x6b6b51f4, 0x4db26158, 0x5005713c,
|
|
0xedb88320, 0xf00f9344, 0xd6d6a3e8, 0xcb61b38c,
|
|
0x9b64c2b0, 0x86d3d2d4, 0xa00ae278, 0xbdbdf21c
|
|
};
|
|
size_t i;
|
|
uint32_t crc;
|
|
|
|
crc = 0xffffffff; /* initial value */
|
|
|
|
for (i = 0; i < len; i++) {
|
|
crc ^= buf[i];
|
|
crc = (crc >> 4) ^ crctab[crc & 0xf];
|
|
crc = (crc >> 4) ^ crctab[crc & 0xf];
|
|
}
|
|
|
|
return (crc);
|
|
}
|
|
#endif
|
|
|
|
uint32_t
|
|
ether_crc32_be(const uint8_t *buf, size_t len)
|
|
{
|
|
size_t i;
|
|
uint32_t crc, carry;
|
|
int bit;
|
|
uint8_t data;
|
|
|
|
crc = 0xffffffff; /* initial value */
|
|
|
|
for (i = 0; i < len; i++) {
|
|
for (data = *buf++, bit = 0; bit < 8; bit++, data >>= 1) {
|
|
carry = ((crc & 0x80000000) ? 1 : 0) ^ (data & 0x01);
|
|
crc <<= 1;
|
|
if (carry)
|
|
crc = (crc ^ ETHER_CRC_POLY_BE) | carry;
|
|
}
|
|
}
|
|
|
|
return (crc);
|
|
}
|
|
|
|
int
|
|
ether_ioctl(struct ifnet *ifp, u_long command, caddr_t data)
|
|
{
|
|
struct ifaddr *ifa = (struct ifaddr *) data;
|
|
struct ifreq *ifr = (struct ifreq *) data;
|
|
int error = 0;
|
|
|
|
switch (command) {
|
|
case SIOCSIFADDR:
|
|
ifp->if_flags |= IFF_UP;
|
|
|
|
switch (ifa->ifa_addr->sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
ifp->if_init(ifp->if_softc); /* before arpwhohas */
|
|
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, ETHER_ADDR_LEN);
|
|
}
|
|
break;
|
|
|
|
case SIOCSIFMTU:
|
|
/*
|
|
* Set the interface MTU.
|
|
*/
|
|
if (ifr->ifr_mtu > ETHERMTU) {
|
|
error = EINVAL;
|
|
} else {
|
|
ifp->if_mtu = ifr->ifr_mtu;
|
|
}
|
|
break;
|
|
default:
|
|
error = EINVAL; /* XXX netbsd has ENOTTY??? */
|
|
break;
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ether_resolvemulti(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 (!ETHER_IS_MULTICAST(e_addr))
|
|
return EADDRNOTAVAIL;
|
|
*llsa = NULL;
|
|
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_ETHER);
|
|
sdl->sdl_alen = ETHER_ADDR_LEN;
|
|
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 = NULL;
|
|
return 0;
|
|
}
|
|
if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr))
|
|
return EADDRNOTAVAIL;
|
|
sdl = link_init_sdl(ifp, *llsa, IFT_ETHER);
|
|
sdl->sdl_alen = ETHER_ADDR_LEN;
|
|
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;
|
|
}
|
|
}
|
|
|
|
static moduledata_t ether_mod = {
|
|
.name = "ether",
|
|
};
|
|
|
|
void
|
|
ether_vlan_mtap(struct bpf_if *bp, struct mbuf *m, void *data, u_int dlen)
|
|
{
|
|
struct ether_vlan_header vlan;
|
|
struct mbuf mv, mb;
|
|
|
|
KASSERT((m->m_flags & M_VLANTAG) != 0,
|
|
("%s: vlan information not present", __func__));
|
|
KASSERT(m->m_len >= sizeof(struct ether_header),
|
|
("%s: mbuf not large enough for header", __func__));
|
|
bcopy(mtod(m, char *), &vlan, sizeof(struct ether_header));
|
|
vlan.evl_proto = vlan.evl_encap_proto;
|
|
vlan.evl_encap_proto = htons(ETHERTYPE_VLAN);
|
|
vlan.evl_tag = htons(m->m_pkthdr.ether_vtag);
|
|
m->m_len -= sizeof(struct ether_header);
|
|
m->m_data += sizeof(struct ether_header);
|
|
/*
|
|
* If a data link has been supplied by the caller, then we will need to
|
|
* re-create a stack allocated mbuf chain with the following structure:
|
|
*
|
|
* (1) mbuf #1 will contain the supplied data link
|
|
* (2) mbuf #2 will contain the vlan header
|
|
* (3) mbuf #3 will contain the original mbuf's packet data
|
|
*
|
|
* Otherwise, submit the packet and vlan header via bpf_mtap2().
|
|
*/
|
|
if (data != NULL) {
|
|
mv.m_next = m;
|
|
mv.m_data = (caddr_t)&vlan;
|
|
mv.m_len = sizeof(vlan);
|
|
mb.m_next = &mv;
|
|
mb.m_data = data;
|
|
mb.m_len = dlen;
|
|
bpf_mtap(bp, &mb);
|
|
} else
|
|
bpf_mtap2(bp, &vlan, sizeof(vlan), m);
|
|
m->m_len += sizeof(struct ether_header);
|
|
m->m_data -= sizeof(struct ether_header);
|
|
}
|
|
|
|
struct mbuf *
|
|
ether_vlanencap(struct mbuf *m, uint16_t tag)
|
|
{
|
|
struct ether_vlan_header *evl;
|
|
|
|
M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_NOWAIT);
|
|
if (m == NULL)
|
|
return (NULL);
|
|
/* M_PREPEND takes care of m_len, m_pkthdr.len for us */
|
|
|
|
if (m->m_len < sizeof(*evl)) {
|
|
m = m_pullup(m, sizeof(*evl));
|
|
if (m == NULL)
|
|
return (NULL);
|
|
}
|
|
|
|
/*
|
|
* Transform the Ethernet header into an Ethernet header
|
|
* with 802.1Q encapsulation.
|
|
*/
|
|
evl = mtod(m, struct ether_vlan_header *);
|
|
bcopy((char *)evl + ETHER_VLAN_ENCAP_LEN,
|
|
(char *)evl, ETHER_HDR_LEN - ETHER_TYPE_LEN);
|
|
evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
|
|
evl->evl_tag = htons(tag);
|
|
return (m);
|
|
}
|
|
|
|
DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
|
|
MODULE_VERSION(ether, 1);
|