kernel: Make SMP support default (and non-optional).
[dragonfly.git] / sys / netproto / mpls / mpls_input.c
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1/*
2 * Copyright (c) 2007 The DragonFly Project. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
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
13 * distribution.
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.
17 *
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
29 * SUCH DAMAGE.
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30 */
31
32#include <sys/globaldata.h>
33#include <sys/kernel.h>
34#include <sys/mbuf.h>
35#include <sys/param.h>
36#include <sys/sysctl.h>
37#include <sys/systm.h>
38
39#include <net/if_var.h>
40#include <net/netisr.h>
41#include <net/route.h>
42
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43#include <sys/thread2.h>
44#include <sys/mplock2.h>
45
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46#include <netproto/mpls/mpls.h>
47#include <netproto/mpls/mpls_var.h>
48
49struct mpls_stats mplsstats_percpu[MAXCPU];
50struct route mplsforward_rt[MAXCPU];
51
52int mplsforwarding = 1;
53/*
54SYSCTL_INT(_net_mpls, OID_AUTO, forwarding, CTLFLAG_RW,
55 &mplsforwarding, 0, "Enable MPLS forwarding between interfaces");
56*/
57
67bf99c4 58static void mpls_input_handler(netmsg_t);
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59static void mpls_forward(struct mbuf *);
60
61void
62mpls_init(void)
63{
9b42cabe 64 int cpu;
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65
66 /*
67 * Initialize MPLS statistics counters for each CPU.
68 *
69 */
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70 for (cpu = 0; cpu < ncpus; ++cpu) {
71 bzero(&mplsstats_percpu[cpu], sizeof(struct mpls_stats));
72 }
9b42cabe 73
c3c96e44 74 netisr_register(NETISR_MPLS, mpls_input_handler, mpls_cpufn);
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75}
76
77static void
67bf99c4 78mpls_input_handler(netmsg_t msg)
9b42cabe 79{
67bf99c4 80 struct mbuf *m = msg->packet.nm_packet;
9b42cabe 81
c3c96e44 82 get_mplock();
9b42cabe 83 mpls_input(m);
c3c96e44 84 rel_mplock();
67bf99c4 85 /* do not reply, msg embedded in mbuf */
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86}
87
88void
89mpls_input(struct mbuf *m)
90{
91 struct mpls *mpls = NULL;
92 mpls_label_t label;
93
94 M_ASSERTPKTHDR(m);
95
96 mplsstat.mplss_total++;
97
98 /* length checks already performed at mpls_demux() */
99 KASSERT(m->m_pkthdr.len >= sizeof(struct mpls),
100 ("mpls_input: mpls header too small"));
101
102again:
103 if (m->m_len < sizeof(struct mpls)) {
104 m = m_pullup(m, sizeof(struct mpls));
105 if (m == NULL) {
106 mplsstat.mplss_toosmall++;
107 return;
108 }
109 }
110
111 mpls = mtod(m, struct mpls*);
112 label = MPLS_LABEL(ntohl(mpls->mpls_shim));
113 switch (label) {
114 case 0:
115 /*
116 * Label 0: represents "IPv4 Explicit NULL Label".
117 */
118 if (MPLS_STACK(ntohl(mpls->mpls_shim))) {
119 /* Decapsulate the ip datagram from the mpls frame. */
120 m_adj(m, sizeof(struct mpls));
c3c96e44 121 netisr_queue(NETISR_IP, m);
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122 return;
123 }
124 goto again; /* If not the bottom label, per RFC4182. */
125
126 case 1:
127 /*
128 * Label 1: represents "Router Alert Label" and is valid
129 * anywhere except at the bottom of the stack.
130 */
131 break;
132
133 case 2:
134 /*
135 * Label 2: represents "IPv6 Explicit NULL Label".
136 */
137 if (MPLS_STACK(ntohl(mpls->mpls_shim))) {
138 /* Decapsulate the ip datagram from the mpls frame. */
139 m_adj(m, sizeof(struct mpls));
c3c96e44 140 netisr_queue(NETISR_IPV6, m);
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141 return;
142 }
143 goto again; /* If not the bottom label, per RFC4182. */
144
145 case 3:
146 /*
147 * Label 3: represents the "Implicit NULL Label" and must not
148 * appear on the wire.
149 */
150 break;
151 default:
152 /*
153 * Labels 4 - 15: reserved, drop them.
154 */
155 if (label <= 15) {
156 mplsstat.mplss_reserved++;
157 m_freem(m);
158 return;
159 }
160 if (mplsforwarding) {
161 mpls_forward(m);
162 return;
163 } else {
164 mplsstat.mplss_cantforward++;
165 m_freem(m);
166 return;
167 }
168 }
169
170 mplsstat.mplss_invalid++;
171 m_freem(m);
172}
173
174static void
175mpls_forward(struct mbuf *m)
176{
177 struct sockaddr_mpls *smpls;
178 struct mpls *mpls;
179 struct route *cache_rt = &mplsforward_rt[mycpuid];
180 mpls_label_t label;
181 struct ifnet *ifp;
182 struct sockaddr *dst;
cb8d752c 183 int error;
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184
185 KASSERT(m->m_len >= sizeof(struct mpls),
cb8d752c 186 ("mpls_forward: mpls header not in one mbuf"));
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187
188 mpls = mtod(m, struct mpls *);
189 label = MPLS_LABEL(ntohl(mpls->mpls_shim));
190
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;
196 }
197 smpls->smpls_family = AF_MPLS;
198 smpls->smpls_len = sizeof(struct sockaddr_mpls);
199 smpls->smpls_label = htonl(label);
200 rtalloc(cache_rt);
201 if (cache_rt->ro_rt == NULL) {
202 /* route not found */
203 return;
204 }
205 }
206
207 ifp = cache_rt->ro_rt->rt_ifp;
208 dst = cache_rt->ro_rt->rt_gateway;
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209 error = mpls_output(m, cache_rt->ro_rt);
210 if (error)
211 goto bad;
212 error = (*ifp->if_output)(ifp, m, dst, cache_rt->ro_rt);
213 if (error)
214 goto bad;
215 mplsstat.mplss_forwarded++;
216
217 return;
218bad:
219 m_freem(m);
9b42cabe 220}