2 * Copyright (c) 2009-2010 Ana Kukec <anchie@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * 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 the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
30 #include <sys/param.h>
31 #include <sys/kernel.h>
32 #include <sys/malloc.h>
34 #include <sys/module.h>
36 #include <sys/protosw.h>
38 #include <sys/systm.h>
39 #include <sys/socket.h>
40 #include <sys/sockbuf.h>
41 #include <sys/socketvar.h>
42 #include <sys/types.h>
44 #include <net/route.h>
46 #include <net/if_var.h>
49 #include <netinet/in.h>
50 #include <netinet/in_kdtrace.h>
51 #include <netinet/ip_var.h>
52 #include <netinet/ip6.h>
53 #include <netinet/icmp6.h>
55 #include <netinet6/in6_var.h>
56 #include <netinet6/nd6.h>
57 #include <netinet6/scope6_var.h>
58 #include <netinet6/send.h>
60 static MALLOC_DEFINE(M_SEND, "send", "Secure Neighbour Discovery");
63 * The socket used to communicate with the SeND daemon.
65 static VNET_DEFINE(struct socket *, send_so);
66 #define V_send_so VNET(send_so)
68 u_long send_sendspace = 8 * (1024 + sizeof(struct sockaddr_send));
69 u_long send_recvspace = 9216;
72 #define SEND_LOCK_INIT() mtx_init(&send_mtx, "send_mtx", NULL, MTX_DEF)
73 #define SEND_LOCK() mtx_lock(&send_mtx)
74 #define SEND_UNLOCK() mtx_unlock(&send_mtx)
75 #define SEND_LOCK_DESTROY() mtx_destroy(&send_mtx)
78 send_attach(struct socket *so, int proto, struct thread *td)
83 if (V_send_so != NULL) {
88 error = priv_check(td, PRIV_NETINET_RAW);
94 if (proto != IPPROTO_SEND) {
96 return (EPROTONOSUPPORT);
98 error = soreserve(so, send_sendspace, send_recvspace);
111 send_output(struct mbuf *m, struct ifnet *ifp, int direction)
114 struct sockaddr_in6 dst;
115 struct icmp6_hdr *icmp6;
119 * Receive incoming (SeND-protected) or outgoing traffic
120 * (SeND-validated) from the SeND user space application.
125 if (m->m_len < (sizeof(struct ip6_hdr) +
126 sizeof(struct icmp6_hdr))) {
127 m = m_pullup(m, sizeof(struct ip6_hdr) +
128 sizeof(struct icmp6_hdr));
133 /* Before passing off the mbuf record the proper interface. */
134 m->m_pkthdr.rcvif = ifp;
136 if (m->m_flags & M_PKTHDR)
137 icmp6len = m->m_pkthdr.len - sizeof(struct ip6_hdr);
139 panic("Doh! not the first mbuf.");
141 ip6 = mtod(m, struct ip6_hdr *);
142 icmp6 = (struct icmp6_hdr *)(ip6 + 1);
145 * Output the packet as icmp6.c:icpm6_input() would do.
146 * The mbuf is always consumed, so we do not have to
149 switch (icmp6->icmp6_type) {
150 case ND_NEIGHBOR_SOLICIT:
151 nd6_ns_input(m, sizeof(struct ip6_hdr), icmp6len);
153 case ND_NEIGHBOR_ADVERT:
154 nd6_na_input(m, sizeof(struct ip6_hdr), icmp6len);
157 icmp6_redirect_input(m, sizeof(struct ip6_hdr));
159 case ND_ROUTER_SOLICIT:
160 nd6_rs_input(m, sizeof(struct ip6_hdr), icmp6len);
162 case ND_ROUTER_ADVERT:
163 nd6_ra_input(m, sizeof(struct ip6_hdr), icmp6len);
172 if (m->m_len < sizeof(struct ip6_hdr)) {
173 m = m_pullup(m, sizeof(struct ip6_hdr));
177 ip6 = mtod(m, struct ip6_hdr *);
178 if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst))
179 m->m_flags |= M_MCAST;
181 bzero(&dst, sizeof(dst));
182 dst.sin6_family = AF_INET6;
183 dst.sin6_len = sizeof(dst);
184 dst.sin6_addr = ip6->ip6_dst;
186 m_clrprotoflags(m); /* Avoid confusing lower layers. */
188 IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6);
191 * Output the packet as nd6.c:nd6_output_lle() would do.
192 * The mbuf is always consumed, so we do not have to care
194 * XXX-BZ as we added data, what about fragmenting,
198 error = ((*ifp->if_output)(ifp, m, (struct sockaddr *)&dst,
205 panic("%s: direction %d neither SND_IN nor SND_OUT.",
206 __func__, direction);
211 * Receive a SeND message from user space to be either send out by the kernel
212 * or, with SeND ICMPv6 options removed, to be further processed by the icmp6
216 send_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
217 struct mbuf *control, struct thread *td)
219 struct sockaddr_send *sendsrc;
223 KASSERT(V_send_so == so, ("%s: socket %p not send socket %p",
224 __func__, so, V_send_so));
226 sendsrc = (struct sockaddr_send *)nam;
227 ifp = ifnet_byindex_ref(sendsrc->send_ifidx);
233 error = send_output(m, ifp, sendsrc->send_direction);
244 send_close(struct socket *so)
254 * Send a SeND message to user space, that was either received and has to be
255 * validated or was about to be send out and has to be handled by the SEND
256 * daemon adding SeND ICMPv6 options.
259 send_input(struct mbuf *m, struct ifnet *ifp, int direction, int msglen __unused)
262 struct sockaddr_send sendsrc;
265 if (V_send_so == NULL) {
271 * Make sure to clear any possible internally embedded scope before
272 * passing the packet to user space for SeND cryptographic signature
273 * validation to succeed.
275 ip6 = mtod(m, struct ip6_hdr *);
276 in6_clearscope(&ip6->ip6_src);
277 in6_clearscope(&ip6->ip6_dst);
279 bzero(&sendsrc, sizeof(sendsrc));
280 sendsrc.send_len = sizeof(sendsrc);
281 sendsrc.send_family = AF_INET6;
282 sendsrc.send_direction = direction;
283 sendsrc.send_ifidx = ifp->if_index;
286 * Send incoming or outgoing traffic to user space either to be
287 * protected (outgoing) or validated (incoming) according to rfc3971.
289 SOCKBUF_LOCK(&V_send_so->so_rcv);
290 if (sbappendaddr_locked(&V_send_so->so_rcv,
291 (struct sockaddr *)&sendsrc, m, NULL) == 0) {
292 SOCKBUF_UNLOCK(&V_send_so->so_rcv);
296 sorwakeup_locked(V_send_so);
303 struct pr_usrreqs send_usrreqs = {
304 .pru_attach = send_attach,
305 .pru_send = send_send,
306 .pru_detach = send_close
308 struct protosw send_protosw = {
310 .pr_flags = PR_ATOMIC|PR_ADDR,
311 .pr_protocol = IPPROTO_SEND,
312 .pr_usrreqs = &send_usrreqs
316 send_modevent(module_t mod, int type, void *unused)
319 VNET_ITERATOR_DECL(vnet_iter);
327 error = pf_proto_register(PF_INET6, &send_protosw);
329 printf("%s:%d: MOD_LOAD pf_proto_register(): %d\n",
330 __func__, __LINE__, error);
334 send_sendso_input_hook = send_input;
337 /* Do not allow unloading w/o locking. */
340 VNET_LIST_RLOCK_NOSLEEP();
342 VNET_FOREACH(vnet_iter) {
343 CURVNET_SET(vnet_iter);
344 if (V_send_so != NULL) {
347 VNET_LIST_RUNLOCK_NOSLEEP();
353 VNET_LIST_RUNLOCK_NOSLEEP();
354 error = pf_proto_unregister(PF_INET6, IPPROTO_SEND, SOCK_RAW);
357 send_sendso_input_hook = NULL;
368 static moduledata_t sendmod = {
374 DECLARE_MODULE(send, sendmod, SI_SUB_PROTO_DOMAIN, SI_ORDER_ANY);