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-rw-r--r--sys/net/if_ethersubr.c1530
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diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c
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+++ b/sys/net/if_ethersubr.c
@@ -0,0 +1,1530 @@
+/*-
+ * SPDX-License-Identifier: BSD-3-Clause
+ *
+ * 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. 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.
+ */
+
+#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/devctl.h>
+#include <sys/eventhandler.h>
+#include <sys/jail.h>
+#include <sys/kernel.h>
+#include <sys/lock.h>
+#include <sys/malloc.h>
+#include <sys/mbuf.h>
+#include <sys/module.h>
+#include <sys/msan.h>
+#include <sys/proc.h>
+#include <sys/priv.h>
+#include <sys/random.h>
+#include <sys/socket.h>
+#include <sys/sockio.h>
+#include <sys/sysctl.h>
+#include <sys/uuid.h>
+#ifdef KDB
+#include <sys/kdb.h>
+#endif
+
+#include <net/ieee_oui.h>
+#include <net/if.h>
+#include <net/if_var.h>
+#include <net/if_private.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>
+
+#include <crypto/sha1.h>
+
+VNET_DEFINE(pfil_head_t, link_pfil_head); /* 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);
+
+/* if_bridge(4) support */
+void (*bridge_dn_p)(struct mbuf *, struct ifnet *);
+bool (*bridge_same_p)(const void *, const void *);
+void *(*bridge_get_softc_p)(struct ifnet *);
+bool (*bridge_member_ifaddrs_p)(void);
+
+/* if_lagg(4) support */
+struct mbuf *(*lagg_input_ethernet_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 *);
+static int ether_requestencap(struct ifnet *, struct if_encap_req *);
+
+static inline bool ether_do_pcp(struct ifnet *, struct mbuf *);
+
+#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)
+{
+ uint32_t lleflags = 0;
+ int error = 0;
+#if defined(INET) || defined(INET6)
+ struct ether_header *eh = (struct ether_header *)phdr;
+ uint16_t etype;
+#endif
+
+ if (plle)
+ *plle = NULL;
+
+ 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) {
+ int af = RO_GET_FAMILY(ro, dst);
+ error = nd6_resolve(ifp, LLE_SF(af, 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;
+ bool loop_copy;
+ int hlen; /* link layer header length */
+ uint32_t pflags;
+ struct llentry *lle = 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;
+ } else
+ /*
+ * Notify LLE code that
+ * the entry was used
+ * by datapath.
+ */
+ llentry_provide_feedback(lle);
+ }
+ if (lle != NULL) {
+ phdr = lle->r_linkdata;
+ hlen = lle->r_hdrlen;
+ pflags = lle->r_flags;
+ }
+ }
+ }
+
+#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, RO_GET_FAMILY(ro, dst), 0));
+ }
+ loop_copy = (pflags & RT_MAY_LOOP) != 0;
+
+ /*
+ * 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, RO_GET_FAMILY(ro, dst), 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);
+}
+
+static bool
+ether_set_pcp(struct mbuf **mp, struct ifnet *ifp, uint8_t pcp)
+{
+ struct ether_8021q_tag qtag;
+ struct ether_header *eh;
+
+ eh = mtod(*mp, struct ether_header *);
+ if (eh->ether_type == htons(ETHERTYPE_VLAN) ||
+ eh->ether_type == htons(ETHERTYPE_QINQ)) {
+ (*mp)->m_flags &= ~M_VLANTAG;
+ return (true);
+ }
+
+ qtag.vid = 0;
+ qtag.pcp = pcp;
+ qtag.proto = ETHERTYPE_VLAN;
+ if (ether_8021q_frame(mp, ifp, ifp, &qtag))
+ return (true);
+ if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
+ return (false);
+}
+
+/*
+ * 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)
+{
+ if (ether_do_pcp(ifp, m) && !ether_set_pcp(&m, ifp, ifp->if_pcp))
+ return (0);
+
+ if (PFIL_HOOKED_OUT(V_link_pfil_head))
+ switch (pfil_mbuf_out(V_link_pfil_head, &m, ifp, NULL)) {
+ case PFIL_DROPPED:
+ return (EACCES);
+ case PFIL_CONSUMED:
+ return (0);
+ }
+
+#ifdef EXPERIMENTAL
+#if defined(INET6) && defined(INET)
+ /* draft-ietf-6man-ipv6only-flag */
+ /* Catch ETHERTYPE_IP, and ETHERTYPE_[REV]ARP if we are v6-only. */
+ if ((ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY_MASK) != 0) {
+ struct ether_header *eh;
+
+ eh = mtod(m, struct ether_header *);
+ switch (ntohs(eh->ether_type)) {
+ case ETHERTYPE_IP:
+ case ETHERTYPE_ARP:
+ case ETHERTYPE_REVARP:
+ m_freem(m);
+ return (EAFNOSUPPORT);
+ /* NOTREACHED */
+ break;
+ };
+ }
+#endif
+#endif
+
+ /*
+ * Queue message on interface, update output statistics if successful,
+ * and start output if interface not yet active.
+ *
+ * If KMSAN is enabled, use it to verify that the data does not contain
+ * any uninitialized bytes.
+ */
+ kmsan_check_mbuf(m, "ether_output");
+ 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 (__predict_false(m->m_len < ETHER_HDR_LEN)) {
+ /* Drivers should pullup and ensure the mbuf is valid */
+ if_printf(ifp, "discard frame w/o leading ethernet "
+ "header (len %d pkt len %d)\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_ether(m, sizeof(*m));
+
+#ifdef EXPERIMENTAL
+#if defined(INET6) && defined(INET)
+ /* draft-ietf-6man-ipv6only-flag */
+ /* Catch ETHERTYPE_IP, and ETHERTYPE_[REV]ARP if we are v6-only. */
+ if ((ND_IFINFO(ifp)->flags & ND6_IFF_IPV6_ONLY_MASK) != 0) {
+ switch (etype) {
+ case ETHERTYPE_IP:
+ case ETHERTYPE_ARP:
+ case ETHERTYPE_REVARP:
+ m_freem(m);
+ return;
+ /* NOTREACHED */
+ break;
+ };
+ }
+#endif
+#endif
+
+ 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 (!(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_ethernet_p != NULL,
+ ("%s: if_lagg not loaded!", __func__));
+ m = (*lagg_input_ethernet_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.
+ */
+ if ((m->m_flags & M_VLANTAG) == 0 &&
+ ((etype == ETHERTYPE_VLAN) || (etype == ETHERTYPE_QINQ))) {
+ 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 M_BRIDGE_INJECT is set, the packet was received directly by the
+ * bridge via netmap, so "ifp" is the bridge itself and the packet
+ * should be re-examined.
+ */
+ if (ifp->if_bridge != NULL || (m->m_flags & M_BRIDGE_INJECT) != 0) {
+ 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) &&
+ memcmp(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(&ether_nh);
+}
+SYSINIT(ether, SI_SUB_INIT_IF, SI_ORDER_ANY, ether_init, NULL);
+
+static void
+vnet_ether_init(const __unused void *arg)
+{
+ struct pfil_head_args args;
+
+ args.pa_version = PFIL_VERSION;
+ args.pa_flags = PFIL_IN | PFIL_OUT;
+ args.pa_type = PFIL_TYPE_ETHERNET;
+ args.pa_headname = PFIL_ETHER_NAME;
+ V_link_pfil_head = pfil_head_register(&args);
+
+#ifdef VIMAGE
+ netisr_register_vnet(&ether_nh);
+#endif
+}
+VNET_SYSINIT(vnet_ether_init, SI_SUB_PROTO_IF, SI_ORDER_ANY,
+ vnet_ether_init, NULL);
+
+#ifdef VIMAGE
+static void
+vnet_ether_pfil_destroy(const __unused void *arg)
+{
+
+ pfil_head_unregister(V_link_pfil_head);
+}
+VNET_SYSUNINIT(vnet_ether_pfil_uninit, SI_SUB_PROTO_PFIL, SI_ORDER_ANY,
+ vnet_ether_pfil_destroy, NULL);
+
+static void
+vnet_ether_destroy(__unused void *arg)
+{
+
+ netisr_unregister_vnet(&ether_nh);
+}
+VNET_SYSUNINIT(vnet_ether_uninit, SI_SUB_PROTO_IF, SI_ORDER_ANY,
+ vnet_ether_destroy, NULL);
+#endif
+
+static void
+ether_input(struct ifnet *ifp, struct mbuf *m)
+{
+ struct epoch_tracker et;
+ struct mbuf *mn;
+ bool needs_epoch;
+
+ needs_epoch = (ifp->if_flags & IFF_NEEDSEPOCH);
+#ifdef INVARIANTS
+ /*
+ * This temporary code is here to prevent epoch unaware and unmarked
+ * drivers to panic the system. Once all drivers are taken care of,
+ * the whole INVARIANTS block should go away.
+ */
+ if (!needs_epoch && !in_epoch(net_epoch_preempt)) {
+ static bool printedonce;
+
+ needs_epoch = true;
+ if (!printedonce) {
+ printedonce = true;
+ if_printf(ifp, "called %s w/o net epoch! "
+ "PLEASE file a bug report.", __func__);
+#ifdef KDB
+ kdb_backtrace();
+#endif
+ }
+ }
+#endif
+
+ /*
+ * 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.
+ */
+ CURVNET_SET_QUIET(ifp->if_vnet);
+ if (__predict_false(needs_epoch))
+ NET_EPOCH_ENTER(et);
+ 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.
+ */
+ MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
+ KASSERT(m->m_pkthdr.rcvif == ifp, ("%s: ifnet mismatch m %p "
+ "rcvif %p ifp %p", __func__, m, m->m_pkthdr.rcvif, ifp));
+ netisr_dispatch(NETISR_ETHER, m);
+ m = mn;
+ }
+ if (__predict_false(needs_epoch))
+ NET_EPOCH_EXIT(et);
+ CURVNET_RESTORE();
+}
+
+/*
+ * 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;
+
+ NET_EPOCH_ASSERT();
+ KASSERT(ifp != NULL, ("%s: NULL interface pointer", __func__));
+
+ /* Do not grab PROMISC frames in case we are re-entered. */
+ if (PFIL_HOOKED_IN(V_link_pfil_head) && !(m->m_flags & M_PROMISC)) {
+ i = pfil_mbuf_in(V_link_pfil_head, &m, ifp, NULL);
+ if (i != PFIL_PASS)
+ 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.
+ */
+ m->m_flags &= ~M_VLANTAG;
+ m_clrprotoflags(m);
+
+ /*
+ * 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;
+ }
+
+ /* Strip off Ethernet header. */
+ m_adj(m, ETHER_HDR_LEN);
+
+ 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"));
+ (*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 = (ifp->if_capabilities & IFCAP_VLAN_MTU) != 0 ?
+ ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN : ETHER_HDR_LEN;
+ ifp->if_mtu = ETHERMTU;
+ if_attach(ifp);
+ 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);
+
+ if (ifp->if_hw_addr != NULL)
+ bcopy(lla, ifp->if_hw_addr, 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));
+
+ /* Add necessary bits are setup; announce it now. */
+ EVENTHANDLER_INVOKE(ether_ifattach_event, ifp);
+ if (IS_DEFAULT_VNET(curvnet))
+ devctl_notify("ETHERNET", ifp->if_xname, "IFATTACH", NULL);
+}
+
+/*
+ * 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 | CTLFLAG_MPSAFE, 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:
+ bcopy(IF_LLADDR(ifp), &ifr->ifr_addr.sa_data[0],
+ 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;
+
+ case SIOCSLANPCP:
+ error = priv_check(curthread, PRIV_NET_SETLANPCP);
+ if (error != 0)
+ break;
+ if (ifr->ifr_lan_pcp > 7 &&
+ ifr->ifr_lan_pcp != IFNET_PCP_NONE) {
+ error = EINVAL;
+ } else {
+ ifp->if_pcp = ifr->ifr_lan_pcp;
+ /* broadcast event about PCP change */
+ EVENTHANDLER_INVOKE(ifnet_event, ifp, IFNET_EVENT_PCP);
+ }
+ break;
+
+ case SIOCGLANPCP:
+ ifr->ifr_lan_pcp = ifp->if_pcp;
+ 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_proto(struct mbuf *m, uint16_t tag, uint16_t proto)
+{
+ 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(proto);
+ evl->evl_tag = htons(tag);
+ return (m);
+}
+
+void
+ether_bpf_mtap_if(struct ifnet *ifp, struct mbuf *m)
+{
+ if (bpf_peers_present(ifp->if_bpf)) {
+ M_ASSERTVALID(m);
+ if ((m->m_flags & M_VLANTAG) != 0)
+ ether_vlan_mtap(ifp->if_bpf, m, NULL, 0);
+ else
+ bpf_mtap(ifp->if_bpf, m);
+ }
+}
+
+static SYSCTL_NODE(_net_link, IFT_L2VLAN, vlan, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+ "IEEE 802.1Q VLAN");
+static SYSCTL_NODE(_net_link_vlan, PF_LINK, link,
+ CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
+ "for consistency");
+
+VNET_DEFINE_STATIC(int, soft_pad);
+#define V_soft_pad VNET(soft_pad)
+SYSCTL_INT(_net_link_vlan, OID_AUTO, soft_pad, CTLFLAG_RW | CTLFLAG_VNET,
+ &VNET_NAME(soft_pad), 0,
+ "pad short frames before tagging");
+
+/*
+ * For now, make preserving PCP via an mbuf tag optional, as it increases
+ * per-packet memory allocations and frees. In the future, it would be
+ * preferable to reuse ether_vtag for this, or similar.
+ */
+VNET_DEFINE(int, vlan_mtag_pcp) = 0;
+#define V_vlan_mtag_pcp VNET(vlan_mtag_pcp)
+SYSCTL_INT(_net_link_vlan, OID_AUTO, mtag_pcp, CTLFLAG_RW | CTLFLAG_VNET,
+ &VNET_NAME(vlan_mtag_pcp), 0,
+ "Retain VLAN PCP information as packets are passed up the stack");
+
+static inline bool
+ether_do_pcp(struct ifnet *ifp, struct mbuf *m)
+{
+ if (ifp->if_type == IFT_L2VLAN)
+ return (false);
+ if (ifp->if_pcp != IFNET_PCP_NONE || (m->m_flags & M_VLANTAG) != 0)
+ return (true);
+ if (V_vlan_mtag_pcp &&
+ m_tag_locate(m, MTAG_8021Q, MTAG_8021Q_PCP_OUT, NULL) != NULL)
+ return (true);
+ return (false);
+}
+
+bool
+ether_8021q_frame(struct mbuf **mp, struct ifnet *ife, struct ifnet *p,
+ const struct ether_8021q_tag *qtag)
+{
+ struct m_tag *mtag;
+ int n;
+ uint16_t tag;
+ uint8_t pcp = qtag->pcp;
+ static const char pad[8]; /* just zeros */
+
+ /*
+ * Pad the frame to the minimum size allowed if told to.
+ * This option is in accord with IEEE Std 802.1Q, 2003 Ed.,
+ * paragraph C.4.4.3.b. It can help to work around buggy
+ * bridges that violate paragraph C.4.4.3.a from the same
+ * document, i.e., fail to pad short frames after untagging.
+ * E.g., a tagged frame 66 bytes long (incl. FCS) is OK, but
+ * untagging it will produce a 62-byte frame, which is a runt
+ * and requires padding. There are VLAN-enabled network
+ * devices that just discard such runts instead or mishandle
+ * them somehow.
+ */
+ if (V_soft_pad && p->if_type == IFT_ETHER) {
+ for (n = ETHERMIN + ETHER_HDR_LEN - (*mp)->m_pkthdr.len;
+ n > 0; n -= sizeof(pad)) {
+ if (!m_append(*mp, min(n, sizeof(pad)), pad))
+ break;
+ }
+ if (n > 0) {
+ m_freem(*mp);
+ *mp = NULL;
+ if_printf(ife, "cannot pad short frame");
+ return (false);
+ }
+ }
+
+ /*
+ * If PCP is set in mbuf, use it
+ */
+ if ((*mp)->m_flags & M_VLANTAG) {
+ pcp = EVL_PRIOFTAG((*mp)->m_pkthdr.ether_vtag);
+ }
+
+ /*
+ * If underlying interface can do VLAN tag insertion itself,
+ * just pass the packet along. However, we need some way to
+ * tell the interface where the packet came from so that it
+ * knows how to find the VLAN tag to use, so we attach a
+ * packet tag that holds it.
+ */
+ if (V_vlan_mtag_pcp && (mtag = m_tag_locate(*mp, MTAG_8021Q,
+ MTAG_8021Q_PCP_OUT, NULL)) != NULL)
+ tag = EVL_MAKETAG(qtag->vid, *(uint8_t *)(mtag + 1), 0);
+ else
+ tag = EVL_MAKETAG(qtag->vid, pcp, 0);
+ if ((p->if_capenable & IFCAP_VLAN_HWTAGGING) &&
+ (qtag->proto == ETHERTYPE_VLAN)) {
+ (*mp)->m_pkthdr.ether_vtag = tag;
+ (*mp)->m_flags |= M_VLANTAG;
+ } else {
+ *mp = ether_vlanencap_proto(*mp, tag, qtag->proto);
+ if (*mp == NULL) {
+ if_printf(ife, "unable to prepend 802.1Q header");
+ return (false);
+ }
+ (*mp)->m_flags &= ~M_VLANTAG;
+ }
+ return (true);
+}
+
+/*
+ * Allocate an address from the FreeBSD Foundation OUI. This uses a
+ * cryptographic hash function on the containing jail's name, UUID and the
+ * interface name to attempt to provide a unique but stable address.
+ * Pseudo-interfaces which require a MAC address should use this function to
+ * allocate non-locally-administered addresses.
+ */
+void
+ether_gen_addr_byname(const char *nameunit, struct ether_addr *hwaddr)
+{
+ SHA1_CTX ctx;
+ char *buf;
+ char uuid[HOSTUUIDLEN + 1];
+ uint64_t addr;
+ int i, sz;
+ unsigned char digest[SHA1_RESULTLEN];
+ char jailname[MAXHOSTNAMELEN];
+
+ getcredhostuuid(curthread->td_ucred, uuid, sizeof(uuid));
+ if (strncmp(uuid, DEFAULT_HOSTUUID, sizeof(uuid)) == 0) {
+ /* Fall back to a random mac address. */
+ goto rando;
+ }
+
+ /* If each (vnet) jail would also have a unique hostuuid this would not
+ * be necessary. */
+ getjailname(curthread->td_ucred, jailname, sizeof(jailname));
+ sz = asprintf(&buf, M_TEMP, "%s-%s-%s", uuid, nameunit,
+ jailname);
+ if (sz < 0) {
+ /* Fall back to a random mac address. */
+ goto rando;
+ }
+
+ SHA1Init(&ctx);
+ SHA1Update(&ctx, buf, sz);
+ SHA1Final(digest, &ctx);
+ free(buf, M_TEMP);
+
+ addr = (digest[0] << 8) | digest[1] | OUI_FREEBSD_GENERATED_LOW;
+ for (i = 0; i < ETHER_ADDR_LEN; ++i) {
+ hwaddr->octet[i] = addr >> ((ETHER_ADDR_LEN - i - 1) * 8) &
+ 0xFF;
+ }
+
+ return;
+rando:
+ arc4rand(hwaddr, sizeof(*hwaddr), 0);
+ /* Unicast */
+ hwaddr->octet[0] &= 0xFE;
+ /* Locally administered. */
+ hwaddr->octet[0] |= 0x02;
+}
+
+void
+ether_gen_addr(struct ifnet *ifp, struct ether_addr *hwaddr)
+{
+ ether_gen_addr_byname(if_name(ifp), hwaddr);
+}
+
+DECLARE_MODULE(ether, ether_mod, SI_SUB_INIT_IF, SI_ORDER_ANY);
+MODULE_VERSION(ether, 1);
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-27 00:18:27 +0000