2 * Copyright (c) 2007 The DragonFly Project. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in
12 * the documentation and/or other materials provided with the
14 * 3. Neither the name of The DragonFly Project nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific, prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
24 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
25 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
26 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
28 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $DragonFly: src/sys/netproto/mpls/mpls_input.c,v 1.1 2008/07/07 22:02:10 nant Exp $
34 #include <sys/globaldata.h>
35 #include <sys/kernel.h>
37 #include <sys/param.h>
38 #include <sys/sysctl.h>
39 #include <sys/systm.h>
41 #include <net/if_var.h>
42 #include <net/netisr.h>
43 #include <net/route.h>
45 #include <netproto/mpls/mpls.h>
46 #include <netproto/mpls/mpls_var.h>
48 struct mpls_stats mplsstats_percpu[MAXCPU];
49 struct route mplsforward_rt[MAXCPU];
51 int mplsforwarding = 1;
53 SYSCTL_INT(_net_mpls, OID_AUTO, forwarding, CTLFLAG_RW,
54 &mplsforwarding, 0, "Enable MPLS forwarding between interfaces");
57 static void mpls_input_handler(struct netmsg *);
58 static void mpls_forward(struct mbuf *);
68 * Initialize MPLS statistics counters for each CPU.
72 for (cpu = 0; cpu < ncpus; ++cpu) {
73 bzero(&mplsstats_percpu[cpu], sizeof(struct mpls_stats));
76 bzero(&mplsstat, sizeof(struct mpls_stats));
79 netisr_register(NETISR_MPLS, mpls_mport, mpls_input_handler);
83 mpls_input_handler(struct netmsg *msg0)
85 struct mbuf *m = ((struct netmsg_packet *)msg0)->nm_packet;
91 mpls_input(struct mbuf *m)
93 struct mpls *mpls = NULL;
98 mplsstat.mplss_total++;
100 /* length checks already performed at mpls_demux() */
101 KASSERT(m->m_pkthdr.len >= sizeof(struct mpls),
102 ("mpls_input: mpls header too small"));
105 if (m->m_len < sizeof(struct mpls)) {
106 m = m_pullup(m, sizeof(struct mpls));
108 mplsstat.mplss_toosmall++;
113 mpls = mtod(m, struct mpls*);
114 label = MPLS_LABEL(ntohl(mpls->mpls_shim));
118 * Label 0: represents "IPv4 Explicit NULL Label".
120 if (MPLS_STACK(ntohl(mpls->mpls_shim))) {
121 /* Decapsulate the ip datagram from the mpls frame. */
122 m_adj(m, sizeof(struct mpls));
126 netisr_dispatch(NETISR_IP, m);
129 goto again; /* If not the bottom label, per RFC4182. */
133 * Label 1: represents "Router Alert Label" and is valid
134 * anywhere except at the bottom of the stack.
140 * Label 2: represents "IPv6 Explicit NULL Label".
142 if (MPLS_STACK(ntohl(mpls->mpls_shim))) {
143 /* Decapsulate the ip datagram from the mpls frame. */
144 m_adj(m, sizeof(struct mpls));
145 netisr_dispatch(NETISR_IPV6, m);
148 goto again; /* If not the bottom label, per RFC4182. */
152 * Label 3: represents the "Implicit NULL Label" and must not
153 * appear on the wire.
158 * Labels 4 - 15: reserved, drop them.
161 mplsstat.mplss_reserved++;
165 if (mplsforwarding) {
169 mplsstat.mplss_cantforward++;
175 mplsstat.mplss_invalid++;
180 mpls_forward(struct mbuf *m)
182 struct sockaddr_mpls *smpls;
184 struct route *cache_rt = &mplsforward_rt[mycpuid];
187 struct sockaddr *dst;
189 KASSERT(m->m_len >= sizeof(struct mpls),
190 ("mpls_input: mpls header not in one mbuf"));
192 mpls = mtod(m, struct mpls *);
193 label = MPLS_LABEL(ntohl(mpls->mpls_shim));
195 smpls = (struct sockaddr_mpls *) &cache_rt->ro_dst;
196 if (cache_rt->ro_rt == NULL || smpls->smpls_label != label) {
197 if (cache_rt->ro_rt != NULL) {
198 RTFREE(cache_rt->ro_rt);
199 cache_rt->ro_rt = NULL;
201 smpls->smpls_family = AF_MPLS;
202 smpls->smpls_len = sizeof(struct sockaddr_mpls);
203 smpls->smpls_label = htonl(label);
205 if (cache_rt->ro_rt == NULL) {
206 /* route not found */
211 ifp = cache_rt->ro_rt->rt_ifp;
212 dst = cache_rt->ro_rt->rt_gateway;
214 if (mpls_output(ifp, m, dst, cache_rt->ro_rt) != 0)
217 mplsstat.mplss_forwarded++;