2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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15 * This product includes software developed by the University of
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30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95
34 * $FreeBSD: src/sys/netinet/raw_ip.c,v 1.64.2.16 2003/08/24 08:24:38 hsu Exp $
35 * $DragonFly: src/sys/netinet/raw_ip.c,v 1.11 2004/03/06 05:00:41 hsu Exp $
38 #include "opt_inet6.h"
39 #include "opt_ipsec.h"
40 #include "opt_random_ip_id.h"
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/kernel.h>
45 #include <sys/malloc.h>
48 #include <sys/protosw.h>
49 #include <sys/socket.h>
50 #include <sys/socketvar.h>
51 #include <sys/sysctl.h>
53 #include <vm/vm_zone.h>
56 #include <net/route.h>
59 #include <netinet/in.h>
60 #include <netinet/in_systm.h>
61 #include <netinet/ip.h>
62 #include <netinet/in_pcb.h>
63 #include <netinet/in_var.h>
64 #include <netinet/ip_var.h>
66 #include <net/ip_mroute/ip_mroute.h>
67 #include <net/ipfw/ip_fw.h>
68 #include <net/dummynet/ip_dummynet.h>
71 #include <netipsec/ipsec.h>
75 #include <netinet6/ipsec.h>
78 struct inpcbinfo ripcbinfo;
80 /* control hooks for ipfw and dummynet */
81 ip_fw_ctl_t *ip_fw_ctl_ptr;
82 ip_dn_ctl_t *ip_dn_ctl_ptr;
85 * hooks for multicast routing. They all default to NULL,
86 * so leave them not initialized and rely on BSS being set to 0.
89 /* The socket used to communicate with the multicast routing daemon. */
90 struct socket *ip_mrouter;
92 /* The various mrouter and rsvp functions */
93 int (*ip_mrouter_set)(struct socket *, struct sockopt *);
94 int (*ip_mrouter_get)(struct socket *, struct sockopt *);
95 int (*ip_mrouter_done)(void);
96 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
97 struct ip_moptions *);
98 int (*mrt_ioctl)(int, caddr_t);
99 int (*legal_vif_num)(int);
100 u_long (*ip_mcast_src)(int);
102 void (*rsvp_input_p)(struct mbuf *m, int off, int proto);
103 int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
104 void (*ip_rsvp_force_done)(struct socket *);
107 * Nominal space allocated to a raw ip socket.
113 * Raw interface to IP protocol.
117 * Initialize raw connection block queue.
122 LIST_INIT(&ripcbinfo.listhead);
124 * XXX We don't use the hash list for raw IP, but it's easier
125 * to allocate a one entry hash list than it is to check all
126 * over the place for hashbase == NULL.
128 ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask);
129 ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask);
130 ripcbinfo.bindhashbase = hashinit(1, M_PCB, &ripcbinfo.bindhashmask);
131 ripcbinfo.ipi_zone = zinit("ripcb", sizeof(struct inpcb),
132 maxsockets, ZONE_INTERRUPT, 0);
136 * XXX ripsrc is modified in rip_input, so we must be fix this
137 * when we want to make this code smp-friendly.
139 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
142 * Setup generic address and protocol structures
143 * for raw_input routine, then pass them along with
147 rip_input(struct mbuf *m, int off, int proto)
149 struct ip *ip = mtod(m, struct ip *);
151 struct inpcb *last = NULL;
152 struct mbuf *opts = NULL;
154 ripsrc.sin_addr = ip->ip_src;
155 LIST_FOREACH(inp, &ripcbinfo.listhead, inp_list) {
157 if ((inp->inp_vflag & INP_IPV4) == 0)
160 if (inp->inp_ip_p && inp->inp_ip_p != proto)
162 if (inp->inp_laddr.s_addr != INADDR_ANY &&
163 inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
165 if (inp->inp_faddr.s_addr != INADDR_ANY &&
166 inp->inp_faddr.s_addr != ip->ip_src.s_addr)
169 struct mbuf *n = m_copypacket(m, M_DONTWAIT);
172 /* check AH/ESP integrity. */
173 if (n && ipsec4_in_reject_so(n, last->inp_socket)) {
175 ipsecstat.in_polvio++;
176 /* do not inject data to pcb */
180 /* check AH/ESP integrity. */
181 if (ipsec4_in_reject(n, last)) {
183 /* do not inject data to pcb */
185 #endif /*FAST_IPSEC*/
187 if (last->inp_flags & INP_CONTROLOPTS ||
188 last->inp_socket->so_options & SO_TIMESTAMP)
189 ip_savecontrol(last, &opts, ip, n);
190 if (sbappendaddr(&last->inp_socket->so_rcv,
191 (struct sockaddr *)&ripsrc, n,
193 /* should notify about lost packet */
198 sorwakeup(last->inp_socket);
205 /* check AH/ESP integrity. */
206 if (last && ipsec4_in_reject_so(m, last->inp_socket)) {
208 ipsecstat.in_polvio++;
209 ipstat.ips_delivered--;
210 /* do not inject data to pcb */
214 /* check AH/ESP integrity. */
215 if (last && ipsec4_in_reject(m, last)) {
217 ipstat.ips_delivered--;
218 /* do not inject data to pcb */
220 #endif /*FAST_IPSEC*/
222 if (last->inp_flags & INP_CONTROLOPTS ||
223 last->inp_socket->so_options & SO_TIMESTAMP)
224 ip_savecontrol(last, &opts, ip, m);
225 if (sbappendaddr(&last->inp_socket->so_rcv,
226 (struct sockaddr *)&ripsrc, m, opts) == 0) {
231 sorwakeup(last->inp_socket);
234 ipstat.ips_noproto++;
235 ipstat.ips_delivered--;
240 * Generate IP header and pass packet to ip_output.
241 * Tack on options user may have setup with control call.
244 rip_output(struct mbuf *m, struct socket *so, u_long dst)
247 struct inpcb *inp = sotoinpcb(so);
248 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
251 * If the user handed us a complete IP packet, use it.
252 * Otherwise, allocate an mbuf for a header and fill it in.
254 if ((inp->inp_flags & INP_HDRINCL) == 0) {
255 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
259 M_PREPEND(m, sizeof(struct ip), M_WAIT);
262 ip = mtod(m, struct ip *);
263 ip->ip_tos = inp->inp_ip_tos;
265 ip->ip_p = inp->inp_ip_p;
266 ip->ip_len = m->m_pkthdr.len;
267 ip->ip_src = inp->inp_laddr;
268 ip->ip_dst.s_addr = dst;
269 ip->ip_ttl = inp->inp_ip_ttl;
271 if (m->m_pkthdr.len > IP_MAXPACKET) {
275 ip = mtod(m, struct ip *);
276 /* don't allow both user specified and setsockopt options,
277 and don't allow packet length sizes that will crash */
278 if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2))
280 || (ip->ip_len > m->m_pkthdr.len)
281 || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
287 ip->ip_id = ip_randomid();
289 ip->ip_id = htons(ip_id++);
291 /* XXX prevent ip_output from overwriting header fields */
292 flags |= IP_RAWOUTPUT;
296 return (ip_output(m, inp->inp_options, &inp->inp_route, flags,
297 inp->inp_moptions, inp));
301 * Raw IP socket option processing.
304 rip_ctloutput(struct socket *so, struct sockopt *sopt)
306 struct inpcb *inp = sotoinpcb(so);
309 if (sopt->sopt_level != IPPROTO_IP)
314 switch (sopt->sopt_dir) {
316 switch (sopt->sopt_name) {
318 optval = inp->inp_flags & INP_HDRINCL;
319 error = sooptcopyout(sopt, &optval, sizeof optval);
322 case IP_FW_ADD: /* ADD actually returns the body... */
325 error = ip_fw_ctl_ptr(sopt);
330 case IP_DUMMYNET_GET:
332 error = ip_dn_ctl_ptr(sopt);
345 case MRT_API_SUPPORT:
347 case MRT_ADD_BW_UPCALL:
348 case MRT_DEL_BW_UPCALL:
349 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) :
354 error = ip_ctloutput(so, sopt);
360 switch (sopt->sopt_name) {
362 error = sooptcopyin(sopt, &optval, sizeof optval,
367 inp->inp_flags |= INP_HDRINCL;
369 inp->inp_flags &= ~INP_HDRINCL;
378 error = ip_fw_ctl_ptr(sopt);
383 case IP_DUMMYNET_CONFIGURE:
384 case IP_DUMMYNET_DEL:
385 case IP_DUMMYNET_FLUSH:
387 error = ip_dn_ctl_ptr(sopt);
389 error = ENOPROTOOPT ;
393 error = ip_rsvp_init(so);
397 error = ip_rsvp_done();
401 case IP_RSVP_VIF_OFF:
402 error = ip_rsvp_vif ?
403 ip_rsvp_vif(so, sopt) : EINVAL;
414 case MRT_API_SUPPORT:
416 case MRT_ADD_BW_UPCALL:
417 case MRT_DEL_BW_UPCALL:
418 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) :
423 error = ip_ctloutput(so, sopt);
433 * This function exists solely to receive the PRC_IFDOWN messages which
434 * are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa,
435 * and calls in_ifadown() to remove all routes corresponding to that address.
436 * It also receives the PRC_IFUP messages from if_up() and reinstalls the
440 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip)
442 struct in_ifaddr *ia;
449 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
450 if (ia->ia_ifa.ifa_addr == sa
451 && (ia->ia_flags & IFA_ROUTE)) {
453 * in_ifscrub kills the interface route.
455 in_ifscrub(ia->ia_ifp, ia);
457 * in_ifadown gets rid of all the rest of
458 * the routes. This is not quite the right
459 * thing to do, but at least if we are running
460 * a routing process they will come back.
462 in_ifadown(&ia->ia_ifa, 0);
469 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
470 if (ia->ia_ifa.ifa_addr == sa)
473 if (ia == 0 || (ia->ia_flags & IFA_ROUTE))
476 ifp = ia->ia_ifa.ifa_ifp;
478 if ((ifp->if_flags & IFF_LOOPBACK)
479 || (ifp->if_flags & IFF_POINTOPOINT))
482 err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
484 ia->ia_flags |= IFA_ROUTE;
489 u_long rip_sendspace = RIPSNDQ;
490 u_long rip_recvspace = RIPRCVQ;
492 SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
493 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
494 SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
495 &rip_recvspace, 0, "Maximum incoming raw IP datagram size");
498 rip_attach(struct socket *so, int proto, struct pru_attach_info *ai)
506 if ((error = suser_cred(ai->p_ucred, NULL_CRED_OKAY)) != 0)
509 error = soreserve(so, rip_sendspace, rip_recvspace, ai->sb_rlimit);
513 error = in_pcballoc(so, &ripcbinfo);
517 inp = (struct inpcb *)so->so_pcb;
518 inp->inp_vflag |= INP_IPV4;
519 inp->inp_ip_p = proto;
520 inp->inp_ip_ttl = ip_defttl;
525 rip_detach(struct socket *so)
532 if (so == ip_mrouter && ip_mrouter_done)
534 if (ip_rsvp_force_done)
535 ip_rsvp_force_done(so);
543 rip_abort(struct socket *so)
545 soisdisconnected(so);
546 if (so->so_state & SS_NOFDREF)
547 return rip_detach(so);
552 rip_disconnect(struct socket *so)
554 if ((so->so_state & SS_ISCONNECTED) == 0)
556 return rip_abort(so);
560 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
562 struct inpcb *inp = sotoinpcb(so);
563 struct sockaddr_in *addr = (struct sockaddr_in *)nam;
565 if (nam->sa_len != sizeof(*addr))
568 if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) &&
569 (addr->sin_family != AF_IMPLINK)) ||
570 (addr->sin_addr.s_addr != INADDR_ANY &&
571 ifa_ifwithaddr((struct sockaddr *)addr) == 0))
572 return EADDRNOTAVAIL;
573 inp->inp_laddr = addr->sin_addr;
578 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
580 struct inpcb *inp = sotoinpcb(so);
581 struct sockaddr_in *addr = (struct sockaddr_in *)nam;
583 if (nam->sa_len != sizeof(*addr))
585 if (TAILQ_EMPTY(&ifnet))
586 return EADDRNOTAVAIL;
587 if ((addr->sin_family != AF_INET) &&
588 (addr->sin_family != AF_IMPLINK))
590 inp->inp_faddr = addr->sin_addr;
596 rip_shutdown(struct socket *so)
603 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
604 struct mbuf *control, struct thread *td)
606 struct inpcb *inp = sotoinpcb(so);
609 if (so->so_state & SS_ISCONNECTED) {
614 dst = inp->inp_faddr.s_addr;
620 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
622 return rip_output(m, so, dst);
626 rip_pcblist(SYSCTL_HANDLER_ARGS)
629 struct inpcb *inp, **inp_list;
634 * The process of preparing the TCB list is too time-consuming and
635 * resource-intensive to repeat twice on every request.
637 if (req->oldptr == 0) {
638 n = ripcbinfo.ipi_count;
639 req->oldidx = 2 * (sizeof xig)
640 + (n + n/8) * sizeof(struct xinpcb);
644 if (req->newptr != 0)
648 * OK, now we're committed to doing something.
651 gencnt = ripcbinfo.ipi_gencnt;
652 n = ripcbinfo.ipi_count;
655 xig.xig_len = sizeof xig;
657 xig.xig_gen = gencnt;
658 xig.xig_sogen = so_gencnt;
659 error = SYSCTL_OUT(req, &xig, sizeof xig);
663 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
668 for (inp = LIST_FIRST(&ripcbinfo.listhead), i = 0; inp && i < n;
669 inp = LIST_NEXT(inp, inp_list)) {
670 if (inp->inp_gencnt <= gencnt)
677 for (i = 0; i < n; i++) {
679 if (inp->inp_gencnt <= gencnt) {
681 xi.xi_len = sizeof xi;
682 /* XXX should avoid extra copy */
683 bcopy(inp, &xi.xi_inp, sizeof *inp);
685 sotoxsocket(inp->inp_socket, &xi.xi_socket);
686 error = SYSCTL_OUT(req, &xi, sizeof xi);
691 * Give the user an updated idea of our state.
692 * If the generation differs from what we told
693 * her before, she knows that something happened
694 * while we were processing this request, and it
695 * might be necessary to retry.
698 xig.xig_gen = ripcbinfo.ipi_gencnt;
699 xig.xig_sogen = so_gencnt;
700 xig.xig_count = ripcbinfo.ipi_count;
702 error = SYSCTL_OUT(req, &xig, sizeof xig);
704 free(inp_list, M_TEMP);
708 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0,
709 rip_pcblist, "S,xinpcb", "List of active raw IP sockets");
711 struct pr_usrreqs rip_usrreqs = {
712 rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect,
713 pru_connect2_notsupp, in_control, rip_detach, rip_disconnect,
714 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp,
715 pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown,
716 in_setsockaddr, sosend, soreceive, sopoll