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
32 #include <sys/globaldata.h>
33 #include <sys/kernel.h>
35 #include <sys/param.h>
36 #include <sys/sysctl.h>
37 #include <sys/systm.h>
39 #include <net/if_var.h>
40 #include <net/netisr.h>
41 #include <net/route.h>
43 #include <sys/thread2.h>
44 #include <sys/mplock2.h>
46 #include <netproto/mpls/mpls.h>
47 #include <netproto/mpls/mpls_var.h>
49 struct mpls_stats mplsstats_percpu[MAXCPU];
50 struct route mplsforward_rt[MAXCPU];
52 int mplsforwarding = 1;
54 SYSCTL_INT(_net_mpls, OID_AUTO, forwarding, CTLFLAG_RW,
55 &mplsforwarding, 0, "Enable MPLS forwarding between interfaces");
58 static void mpls_input_handler(netmsg_t);
59 static void mpls_forward(struct mbuf *);
67 * Initialize MPLS statistics counters for each CPU.
70 for (cpu = 0; cpu < ncpus; ++cpu) {
71 bzero(&mplsstats_percpu[cpu], sizeof(struct mpls_stats));
74 netisr_register(NETISR_MPLS, mpls_input_handler, mpls_hashfn);
78 mpls_input_handler(netmsg_t msg)
80 struct mbuf *m = msg->packet.nm_packet;
85 /* do not reply, msg embedded in mbuf */
89 mpls_input(struct mbuf *m)
91 struct mpls *mpls = NULL;
96 mplsstat.mplss_total++;
98 /* length checks already performed at mpls_demux() */
99 KASSERT(m->m_pkthdr.len >= sizeof(struct mpls),
100 ("mpls_input: mpls header too small"));
103 if (m->m_len < sizeof(struct mpls)) {
104 m = m_pullup(m, sizeof(struct mpls));
106 mplsstat.mplss_toosmall++;
111 mpls = mtod(m, struct mpls*);
112 label = MPLS_LABEL(ntohl(mpls->mpls_shim));
116 * Label 0: represents "IPv4 Explicit NULL Label".
118 if (MPLS_STACK(ntohl(mpls->mpls_shim))) {
119 /* Decapsulate the ip datagram from the mpls frame. */
120 m_adj(m, sizeof(struct mpls));
121 netisr_queue(NETISR_IP, m);
124 goto again; /* If not the bottom label, per RFC4182. */
128 * Label 1: represents "Router Alert Label" and is valid
129 * anywhere except at the bottom of the stack.
135 * Label 2: represents "IPv6 Explicit NULL Label".
137 if (MPLS_STACK(ntohl(mpls->mpls_shim))) {
138 /* Decapsulate the ip datagram from the mpls frame. */
139 m_adj(m, sizeof(struct mpls));
140 netisr_queue(NETISR_IPV6, m);
143 goto again; /* If not the bottom label, per RFC4182. */
147 * Label 3: represents the "Implicit NULL Label" and must not
148 * appear on the wire.
153 * Labels 4 - 15: reserved, drop them.
156 mplsstat.mplss_reserved++;
160 if (mplsforwarding) {
164 mplsstat.mplss_cantforward++;
170 mplsstat.mplss_invalid++;
175 mpls_forward(struct mbuf *m)
177 struct sockaddr_mpls *smpls;
179 struct route *cache_rt = &mplsforward_rt[mycpuid];
182 struct sockaddr *dst;
185 KASSERT(m->m_len >= sizeof(struct mpls),
186 ("mpls_forward: mpls header not in one mbuf"));
188 mpls = mtod(m, struct mpls *);
189 label = MPLS_LABEL(ntohl(mpls->mpls_shim));
191 smpls = (struct sockaddr_mpls *) &cache_rt->ro_dst;
192 if (cache_rt->ro_rt == NULL || smpls->smpls_label != label) {
193 if (cache_rt->ro_rt != NULL) {
194 RTFREE(cache_rt->ro_rt);
195 cache_rt->ro_rt = NULL;
197 smpls->smpls_family = AF_MPLS;
198 smpls->smpls_len = sizeof(struct sockaddr_mpls);
199 smpls->smpls_label = htonl(label);
201 if (cache_rt->ro_rt == NULL) {
202 /* route not found */
207 ifp = cache_rt->ro_rt->rt_ifp;
208 dst = cache_rt->ro_rt->rt_gateway;
209 error = mpls_output(m, cache_rt->ro_rt);
212 error = (*ifp->if_output)(ifp, m, dst, cache_rt->ro_rt);
215 mplsstat.mplss_forwarded++;