2 * Copyright (c) 1982, 1986, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
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.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
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33 * @(#)raw_ip.c 8.7 (Berkeley) 5/15/95
37 #include "opt_inet6.h"
38 #include "opt_ipsec.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/kernel.h>
43 #include <sys/malloc.h>
45 #include <sys/protosw.h>
46 #include <sys/socket.h>
47 #include <sys/socketvar.h>
48 #include <sys/sysctl.h>
50 #include <vm/vm_zone.h>
53 #include <net/route.h>
56 #include <netinet/in.h>
57 #include <netinet/in_systm.h>
58 #include <netinet/ip.h>
59 #include <netinet/in_pcb.h>
60 #include <netinet/in_var.h>
61 #include <netinet/ip_var.h>
62 #include <netinet/ip_mroute.h>
64 #include <netinet/ip_fw.h>
67 #include <netinet6/ipsec.h>
72 #include <netinet/ip_dummynet.h>
75 struct inpcbhead ripcb;
76 struct inpcbinfo ripcbinfo;
79 * Nominal space allocated to a raw ip socket.
85 * Raw interface to IP protocol.
89 * Initialize raw connection block q.
95 ripcbinfo.listhead = &ripcb;
97 * XXX We don't use the hash list for raw IP, but it's easier
98 * to allocate a one entry hash list than it is to check all
99 * over the place for hashbase == NULL.
101 ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask);
102 ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask);
103 ripcbinfo.ipi_zone = zinit("ripcb", sizeof(struct inpcb),
104 maxsockets, ZONE_INTERRUPT, 0);
107 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
109 * Setup generic address and protocol structures
110 * for raw_input routine, then pass them along with
114 rip_input(m, off, proto)
118 register struct ip *ip = mtod(m, struct ip *);
119 register struct inpcb *inp;
120 struct inpcb *last = 0;
121 struct mbuf *opts = 0;
123 ripsrc.sin_addr = ip->ip_src;
124 LIST_FOREACH(inp, &ripcb, inp_list) {
126 if ((inp->inp_vflag & INP_IPV4) == 0)
129 if (inp->inp_ip_p && inp->inp_ip_p != proto)
131 if (inp->inp_laddr.s_addr &&
132 inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
134 if (inp->inp_faddr.s_addr &&
135 inp->inp_faddr.s_addr != ip->ip_src.s_addr)
138 struct mbuf *n = m_copy(m, 0, (int)M_COPYALL);
140 if (last->inp_flags & INP_CONTROLOPTS ||
141 last->inp_socket->so_options & SO_TIMESTAMP)
142 ip_savecontrol(last, &opts, ip, n);
143 if (sbappendaddr(&last->inp_socket->so_rcv,
144 (struct sockaddr *)&ripsrc, n,
146 /* should notify about lost packet */
151 sorwakeup(last->inp_socket);
158 if (last->inp_flags & INP_CONTROLOPTS ||
159 last->inp_socket->so_options & SO_TIMESTAMP)
160 ip_savecontrol(last, &opts, ip, m);
161 if (sbappendaddr(&last->inp_socket->so_rcv,
162 (struct sockaddr *)&ripsrc, m, opts) == 0) {
167 sorwakeup(last->inp_socket);
170 ipstat.ips_noproto++;
171 ipstat.ips_delivered--;
176 * Generate IP header and pass packet to ip_output.
177 * Tack on options user may have setup with control call.
180 rip_output(m, so, dst)
185 register struct ip *ip;
186 register struct inpcb *inp = sotoinpcb(so);
187 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
190 * If the user handed us a complete IP packet, use it.
191 * Otherwise, allocate an mbuf for a header and fill it in.
193 if ((inp->inp_flags & INP_HDRINCL) == 0) {
194 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
198 M_PREPEND(m, sizeof(struct ip), M_TRYWAIT);
199 ip = mtod(m, struct ip *);
200 ip->ip_tos = inp->inp_ip_tos;
202 ip->ip_p = inp->inp_ip_p;
203 ip->ip_len = m->m_pkthdr.len;
204 ip->ip_src = inp->inp_laddr;
205 ip->ip_dst.s_addr = dst;
206 ip->ip_ttl = inp->inp_ip_ttl;
208 if (m->m_pkthdr.len > IP_MAXPACKET) {
212 ip = mtod(m, struct ip *);
213 /* don't allow both user specified and setsockopt options,
214 and don't allow packet length sizes that will crash */
215 if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2))
217 || (ip->ip_len > m->m_pkthdr.len)
218 || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
223 ip->ip_id = htons(ip_id++);
224 /* XXX prevent ip_output from overwriting header fields */
225 flags |= IP_RAWOUTPUT;
230 ipsec_setsocket(m, so);
233 return (ip_output(m, inp->inp_options, &inp->inp_route, flags,
238 * Raw IP socket option processing.
241 rip_ctloutput(so, sopt)
243 struct sockopt *sopt;
245 struct inpcb *inp = sotoinpcb(so);
248 if (sopt->sopt_level != IPPROTO_IP)
253 switch (sopt->sopt_dir) {
255 switch (sopt->sopt_name) {
257 optval = inp->inp_flags & INP_HDRINCL;
258 error = sooptcopyout(sopt, &optval, sizeof optval);
263 if (ip_fw_ctl_ptr == 0)
266 error = ip_fw_ctl_ptr(sopt);
270 case IP_DUMMYNET_GET:
271 if (ip_dn_ctl_ptr == NULL)
272 error = ENOPROTOOPT ;
274 error = ip_dn_ctl_ptr(sopt);
276 #endif /* DUMMYNET */
286 error = ip_mrouter_get(so, sopt);
290 error = ip_ctloutput(so, sopt);
296 switch (sopt->sopt_name) {
298 error = sooptcopyin(sopt, &optval, sizeof optval,
303 inp->inp_flags |= INP_HDRINCL;
305 inp->inp_flags &= ~INP_HDRINCL;
313 if (ip_fw_ctl_ptr == 0)
316 error = ip_fw_ctl_ptr(sopt);
320 case IP_DUMMYNET_CONFIGURE:
321 case IP_DUMMYNET_DEL:
322 case IP_DUMMYNET_FLUSH:
323 if (ip_dn_ctl_ptr == NULL)
324 error = ENOPROTOOPT ;
326 error = ip_dn_ctl_ptr(sopt);
331 error = ip_rsvp_init(so);
335 error = ip_rsvp_done();
338 /* XXX - should be combined */
340 error = ip_rsvp_vif_init(so, sopt);
343 case IP_RSVP_VIF_OFF:
344 error = ip_rsvp_vif_done(so, sopt);
355 error = ip_mrouter_set(so, sopt);
359 error = ip_ctloutput(so, sopt);
369 * This function exists solely to receive the PRC_IFDOWN messages which
370 * are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa,
371 * and calls in_ifadown() to remove all routes corresponding to that address.
372 * It also receives the PRC_IFUP messages from if_up() and reinstalls the
376 rip_ctlinput(cmd, sa, vip)
381 struct in_ifaddr *ia;
388 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
389 if (ia->ia_ifa.ifa_addr == sa
390 && (ia->ia_flags & IFA_ROUTE)) {
392 * in_ifscrub kills the interface route.
394 in_ifscrub(ia->ia_ifp, ia);
396 * in_ifadown gets rid of all the rest of
397 * the routes. This is not quite the right
398 * thing to do, but at least if we are running
399 * a routing process they will come back.
401 in_ifadown(&ia->ia_ifa);
408 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
409 if (ia->ia_ifa.ifa_addr == sa)
412 if (ia == 0 || (ia->ia_flags & IFA_ROUTE))
415 ifp = ia->ia_ifa.ifa_ifp;
417 if ((ifp->if_flags & IFF_LOOPBACK)
418 || (ifp->if_flags & IFF_POINTOPOINT))
421 err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
423 ia->ia_flags |= IFA_ROUTE;
428 u_long rip_sendspace = RIPSNDQ;
429 u_long rip_recvspace = RIPRCVQ;
431 SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
432 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
433 SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
434 &rip_recvspace, 0, "Maximum incoming raw IP datagram size");
437 rip_attach(struct socket *so, int proto, struct proc *p)
445 if (p && (error = suser(p)) != 0)
448 error = soreserve(so, rip_sendspace, rip_recvspace);
452 error = in_pcballoc(so, &ripcbinfo, p);
456 inp = (struct inpcb *)so->so_pcb;
457 inp->inp_vflag |= INP_IPV4;
458 inp->inp_ip_p = proto;
459 inp->inp_ip_ttl = ip_defttl;
461 error = ipsec_init_policy(so, &inp->inp_sp);
471 rip_detach(struct socket *so)
478 if (so == ip_mrouter)
480 ip_rsvp_force_done(so);
488 rip_abort(struct socket *so)
490 soisdisconnected(so);
491 return rip_detach(so);
495 rip_disconnect(struct socket *so)
497 if ((so->so_state & SS_ISCONNECTED) == 0)
499 return rip_abort(so);
503 rip_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
505 struct inpcb *inp = sotoinpcb(so);
506 struct sockaddr_in *addr = (struct sockaddr_in *)nam;
508 if (nam->sa_len != sizeof(*addr))
511 if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) &&
512 (addr->sin_family != AF_IMPLINK)) ||
513 (addr->sin_addr.s_addr &&
514 ifa_ifwithaddr((struct sockaddr *)addr) == 0))
515 return EADDRNOTAVAIL;
516 inp->inp_laddr = addr->sin_addr;
521 rip_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
523 struct inpcb *inp = sotoinpcb(so);
524 struct sockaddr_in *addr = (struct sockaddr_in *)nam;
526 if (nam->sa_len != sizeof(*addr))
528 if (TAILQ_EMPTY(&ifnet))
529 return EADDRNOTAVAIL;
530 if ((addr->sin_family != AF_INET) &&
531 (addr->sin_family != AF_IMPLINK))
533 inp->inp_faddr = addr->sin_addr;
539 rip_shutdown(struct socket *so)
546 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
547 struct mbuf *control, struct proc *p)
549 struct inpcb *inp = sotoinpcb(so);
552 if (so->so_state & SS_ISCONNECTED) {
557 dst = inp->inp_faddr.s_addr;
563 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
565 return rip_output(m, so, dst);
569 rip_pcblist(SYSCTL_HANDLER_ARGS)
572 struct inpcb *inp, **inp_list;
577 * The process of preparing the TCB list is too time-consuming and
578 * resource-intensive to repeat twice on every request.
580 if (req->oldptr == 0) {
581 n = ripcbinfo.ipi_count;
582 req->oldidx = 2 * (sizeof xig)
583 + (n + n/8) * sizeof(struct xinpcb);
587 if (req->newptr != 0)
591 * OK, now we're committed to doing something.
594 gencnt = ripcbinfo.ipi_gencnt;
595 n = ripcbinfo.ipi_count;
598 xig.xig_len = sizeof xig;
600 xig.xig_gen = gencnt;
601 xig.xig_sogen = so_gencnt;
602 error = SYSCTL_OUT(req, &xig, sizeof xig);
606 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
611 for (inp = LIST_FIRST(ripcbinfo.listhead), i = 0; inp && i < n;
612 inp = LIST_NEXT(inp, inp_list)) {
613 if (inp->inp_gencnt <= gencnt)
620 for (i = 0; i < n; i++) {
622 if (inp->inp_gencnt <= gencnt) {
624 xi.xi_len = sizeof xi;
625 /* XXX should avoid extra copy */
626 bcopy(inp, &xi.xi_inp, sizeof *inp);
628 sotoxsocket(inp->inp_socket, &xi.xi_socket);
629 error = SYSCTL_OUT(req, &xi, sizeof xi);
634 * Give the user an updated idea of our state.
635 * If the generation differs from what we told
636 * her before, she knows that something happened
637 * while we were processing this request, and it
638 * might be necessary to retry.
641 xig.xig_gen = ripcbinfo.ipi_gencnt;
642 xig.xig_sogen = so_gencnt;
643 xig.xig_count = ripcbinfo.ipi_count;
645 error = SYSCTL_OUT(req, &xig, sizeof xig);
647 free(inp_list, M_TEMP);
651 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0,
652 rip_pcblist, "S,xinpcb", "List of active raw IP sockets");
654 struct pr_usrreqs rip_usrreqs = {
655 rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect,
656 pru_connect2_notsupp, in_control, rip_detach, rip_disconnect,
657 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp,
658 pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown,
659 in_setsockaddr, sosend, soreceive, sopoll