2 * SPDX-License-Identifier: BSD-2-Clause
4 * Copyright (c) 2009-2010 Ana Kukec <anchie@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
33 #include <sys/kernel.h>
34 #include <sys/malloc.h>
36 #include <sys/module.h>
38 #include <sys/protosw.h>
40 #include <sys/systm.h>
41 #include <sys/socket.h>
42 #include <sys/sockbuf.h>
43 #include <sys/socketvar.h>
44 #include <sys/types.h>
46 #include <net/route.h>
48 #include <net/if_var.h>
49 #include <net/if_private.h>
52 #include <netinet/in.h>
53 #include <netinet/in_kdtrace.h>
54 #include <netinet/ip_var.h>
55 #include <netinet/ip6.h>
56 #include <netinet/icmp6.h>
58 #include <netinet6/in6_var.h>
59 #include <netinet6/nd6.h>
60 #include <netinet6/scope6_var.h>
61 #include <netinet6/send.h>
63 static MALLOC_DEFINE(M_SEND, "send", "Secure Neighbour Discovery");
66 * The socket used to communicate with the SeND daemon.
68 VNET_DEFINE_STATIC(struct socket *, send_so);
69 #define V_send_so VNET(send_so)
71 u_long send_sendspace = 8 * (1024 + sizeof(struct sockaddr_send));
72 u_long send_recvspace = 9216;
75 #define SEND_LOCK_INIT() mtx_init(&send_mtx, "send_mtx", NULL, MTX_DEF)
76 #define SEND_LOCK() mtx_lock(&send_mtx)
77 #define SEND_UNLOCK() mtx_unlock(&send_mtx)
78 #define SEND_LOCK_DESTROY() mtx_destroy(&send_mtx)
81 send_attach(struct socket *so, int proto, struct thread *td)
86 if (V_send_so != NULL) {
91 error = priv_check(td, PRIV_NETINET_RAW);
97 if (proto != IPPROTO_SEND) {
99 return (EPROTONOSUPPORT);
101 error = soreserve(so, send_sendspace, send_recvspace);
114 send_output(struct mbuf *m, struct ifnet *ifp, int direction)
117 struct sockaddr_in6 dst;
118 struct icmp6_hdr *icmp6;
119 struct epoch_tracker et;
124 * Receive incoming (SeND-protected) or outgoing traffic
125 * (SeND-validated) from the SeND user space application.
130 if (m->m_len < (sizeof(struct ip6_hdr) +
131 sizeof(struct icmp6_hdr))) {
132 m = m_pullup(m, sizeof(struct ip6_hdr) +
133 sizeof(struct icmp6_hdr));
138 /* Before passing off the mbuf record the proper interface. */
139 m->m_pkthdr.rcvif = ifp;
141 if (m->m_flags & M_PKTHDR)
142 icmp6len = m->m_pkthdr.len - sizeof(struct ip6_hdr);
144 panic("Doh! not the first mbuf.");
146 ip6 = mtod(m, struct ip6_hdr *);
147 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
151 * Output the packet as icmp6.c:icpm6_input() would do.
152 * The mbuf is always consumed, so we do not have to
156 switch (icmp6->icmp6_type) {
157 case ND_NEIGHBOR_SOLICIT:
158 nd6_ns_input(m, sizeof(struct ip6_hdr), icmp6len);
160 case ND_NEIGHBOR_ADVERT:
161 nd6_na_input(m, sizeof(struct ip6_hdr), icmp6len);
164 icmp6_redirect_input(m, sizeof(struct ip6_hdr));
166 case ND_ROUTER_SOLICIT:
167 nd6_rs_input(m, sizeof(struct ip6_hdr), icmp6len);
169 case ND_ROUTER_ADVERT:
170 nd6_ra_input(m, sizeof(struct ip6_hdr), icmp6len);
181 if (m->m_len < sizeof(struct ip6_hdr)) {
182 m = m_pullup(m, sizeof(struct ip6_hdr));
186 ip6 = mtod(m, struct ip6_hdr *);
187 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
188 m->m_flags |= M_MCAST;
190 bzero(&dst, sizeof(dst));
191 dst.sin6_family = AF_INET6;
192 dst.sin6_len = sizeof(dst);
193 dst.sin6_addr = ip6->ip6_dst;
195 m_clrprotoflags(m); /* Avoid confusing lower layers. */
197 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
200 * Output the packet as nd6.c:nd6_output_lle() would do.
201 * The mbuf is always consumed, so we do not have to care
203 * XXX-BZ as we added data, what about fragmenting,
206 error = ((*ifp->if_output)(ifp, m, (struct sockaddr *)&dst,
213 panic("%s: direction %d neither SND_IN nor SND_OUT.",
214 __func__, direction);
219 * Receive a SeND message from user space to be either send out by the kernel
220 * or, with SeND ICMPv6 options removed, to be further processed by the icmp6
224 send_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
225 struct mbuf *control, struct thread *td)
227 struct sockaddr_send *sendsrc;
231 KASSERT(V_send_so == so, ("%s: socket %p not send socket %p",
232 __func__, so, V_send_so));
234 sendsrc = (struct sockaddr_send *)nam;
235 if (sendsrc->send_family != AF_INET6) {
236 error = EAFNOSUPPORT;
239 if (sendsrc->send_len != sizeof(*sendsrc)) {
243 ifp = ifnet_byindex_ref(sendsrc->send_ifidx);
249 error = send_output(m, ifp, sendsrc->send_direction);
263 send_close(struct socket *so)
273 * Send a SeND message to user space, that was either received and has to be
274 * validated or was about to be send out and has to be handled by the SEND
275 * daemon adding SeND ICMPv6 options.
278 send_input(struct mbuf *m, struct ifnet *ifp, int direction, int msglen __unused)
281 struct sockaddr_send sendsrc;
284 if (V_send_so == NULL) {
290 * Make sure to clear any possible internally embedded scope before
291 * passing the packet to user space for SeND cryptographic signature
292 * validation to succeed.
294 ip6 = mtod(m, struct ip6_hdr *);
295 in6_clearscope(&ip6->ip6_src);
296 in6_clearscope(&ip6->ip6_dst);
298 bzero(&sendsrc, sizeof(sendsrc));
299 sendsrc.send_len = sizeof(sendsrc);
300 sendsrc.send_family = AF_INET6;
301 sendsrc.send_direction = direction;
302 sendsrc.send_ifidx = ifp->if_index;
305 * Send incoming or outgoing traffic to user space either to be
306 * protected (outgoing) or validated (incoming) according to rfc3971.
308 SOCKBUF_LOCK(&V_send_so->so_rcv);
309 if (sbappendaddr_locked(&V_send_so->so_rcv,
310 (struct sockaddr *)&sendsrc, m, NULL) == 0) {
311 soroverflow_locked(V_send_so);
315 sorwakeup_locked(V_send_so);
322 static struct protosw send_protosw = {
324 .pr_flags = PR_ATOMIC|PR_ADDR,
325 .pr_protocol = IPPROTO_SEND,
326 .pr_attach = send_attach,
327 .pr_send = send_send,
328 .pr_detach = send_close
332 send_modevent(module_t mod, int type, void *unused)
335 VNET_ITERATOR_DECL(vnet_iter);
343 error = protosw_register(&inet6domain, &send_protosw);
345 printf("%s:%d: MOD_LOAD pf_proto_register(): %d\n",
346 __func__, __LINE__, error);
350 send_sendso_input_hook = send_input;
353 /* Do not allow unloading w/o locking. */
356 VNET_LIST_RLOCK_NOSLEEP();
358 VNET_FOREACH(vnet_iter) {
359 CURVNET_SET(vnet_iter);
360 if (V_send_so != NULL) {
363 VNET_LIST_RUNLOCK_NOSLEEP();
369 VNET_LIST_RUNLOCK_NOSLEEP();
370 error = protosw_unregister(&send_protosw);
373 send_sendso_input_hook = NULL;
384 static moduledata_t sendmod = {
390 DECLARE_MODULE(send, sendmod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);