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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29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 1.9 2004/03/04 01:02:05 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 inpcbhead ripcb;
79 struct inpcbinfo ripcbinfo;
81 /* control hooks for ipfw and dummynet */
82 ip_fw_ctl_t *ip_fw_ctl_ptr;
83 ip_dn_ctl_t *ip_dn_ctl_ptr;
86 * hooks for multicast routing. They all default to NULL,
87 * so leave them not initialized and rely on BSS being set to 0.
90 /* The socket used to communicate with the multicast routing daemon. */
91 struct socket *ip_mrouter;
93 /* The various mrouter and rsvp functions */
94 int (*ip_mrouter_set)(struct socket *, struct sockopt *);
95 int (*ip_mrouter_get)(struct socket *, struct sockopt *);
96 int (*ip_mrouter_done)(void);
97 int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
98 struct ip_moptions *);
99 int (*mrt_ioctl)(int, caddr_t);
100 int (*legal_vif_num)(int);
101 u_long (*ip_mcast_src)(int);
103 void (*rsvp_input_p)(struct mbuf *m, int off, int proto);
104 int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
105 void (*ip_rsvp_force_done)(struct socket *);
108 * Nominal space allocated to a raw ip socket.
114 * Raw interface to IP protocol.
118 * Initialize raw connection block queue.
124 ripcbinfo.listhead = &ripcb;
126 * XXX We don't use the hash list for raw IP, but it's easier
127 * to allocate a one entry hash list than it is to check all
128 * over the place for hashbase == NULL.
130 ripcbinfo.hashbase = hashinit(1, M_PCB, &ripcbinfo.hashmask);
131 ripcbinfo.porthashbase = hashinit(1, M_PCB, &ripcbinfo.porthashmask);
132 ripcbinfo.bindhashbase = hashinit(1, M_PCB, &ripcbinfo.bindhashmask);
133 ripcbinfo.ipi_zone = zinit("ripcb", sizeof(struct inpcb),
134 maxsockets, ZONE_INTERRUPT, 0);
138 * XXX ripsrc is modified in rip_input, so we must be fix this
139 * when we want to make this code smp-friendly.
141 static struct sockaddr_in ripsrc = { sizeof(ripsrc), AF_INET };
144 * Setup generic address and protocol structures
145 * for raw_input routine, then pass them along with
149 rip_input(struct mbuf *m, int off, int proto)
151 struct ip *ip = mtod(m, struct ip *);
153 struct inpcb *last = NULL;
154 struct mbuf *opts = NULL;
156 ripsrc.sin_addr = ip->ip_src;
157 LIST_FOREACH(inp, &ripcb, inp_list) {
159 if ((inp->inp_vflag & INP_IPV4) == 0)
162 if (inp->inp_ip_p && inp->inp_ip_p != proto)
164 if (inp->inp_laddr.s_addr != INADDR_ANY &&
165 inp->inp_laddr.s_addr != ip->ip_dst.s_addr)
167 if (inp->inp_faddr.s_addr != INADDR_ANY &&
168 inp->inp_faddr.s_addr != ip->ip_src.s_addr)
171 struct mbuf *n = m_copypacket(m, M_DONTWAIT);
174 /* check AH/ESP integrity. */
175 if (n && ipsec4_in_reject_so(n, last->inp_socket)) {
177 ipsecstat.in_polvio++;
178 /* do not inject data to pcb */
182 /* check AH/ESP integrity. */
183 if (ipsec4_in_reject(n, last)) {
185 /* do not inject data to pcb */
187 #endif /*FAST_IPSEC*/
189 if (last->inp_flags & INP_CONTROLOPTS ||
190 last->inp_socket->so_options & SO_TIMESTAMP)
191 ip_savecontrol(last, &opts, ip, n);
192 if (sbappendaddr(&last->inp_socket->so_rcv,
193 (struct sockaddr *)&ripsrc, n,
195 /* should notify about lost packet */
200 sorwakeup(last->inp_socket);
207 /* check AH/ESP integrity. */
208 if (last && ipsec4_in_reject_so(m, last->inp_socket)) {
210 ipsecstat.in_polvio++;
211 ipstat.ips_delivered--;
212 /* do not inject data to pcb */
216 /* check AH/ESP integrity. */
217 if (last && ipsec4_in_reject(m, last)) {
219 ipstat.ips_delivered--;
220 /* do not inject data to pcb */
222 #endif /*FAST_IPSEC*/
224 if (last->inp_flags & INP_CONTROLOPTS ||
225 last->inp_socket->so_options & SO_TIMESTAMP)
226 ip_savecontrol(last, &opts, ip, m);
227 if (sbappendaddr(&last->inp_socket->so_rcv,
228 (struct sockaddr *)&ripsrc, m, opts) == 0) {
233 sorwakeup(last->inp_socket);
236 ipstat.ips_noproto++;
237 ipstat.ips_delivered--;
242 * Generate IP header and pass packet to ip_output.
243 * Tack on options user may have setup with control call.
246 rip_output(struct mbuf *m, struct socket *so, u_long dst)
249 struct inpcb *inp = sotoinpcb(so);
250 int flags = (so->so_options & SO_DONTROUTE) | IP_ALLOWBROADCAST;
253 * If the user handed us a complete IP packet, use it.
254 * Otherwise, allocate an mbuf for a header and fill it in.
256 if ((inp->inp_flags & INP_HDRINCL) == 0) {
257 if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
261 M_PREPEND(m, sizeof(struct ip), M_WAIT);
264 ip = mtod(m, struct ip *);
265 ip->ip_tos = inp->inp_ip_tos;
267 ip->ip_p = inp->inp_ip_p;
268 ip->ip_len = m->m_pkthdr.len;
269 ip->ip_src = inp->inp_laddr;
270 ip->ip_dst.s_addr = dst;
271 ip->ip_ttl = inp->inp_ip_ttl;
273 if (m->m_pkthdr.len > IP_MAXPACKET) {
277 ip = mtod(m, struct ip *);
278 /* don't allow both user specified and setsockopt options,
279 and don't allow packet length sizes that will crash */
280 if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2))
282 || (ip->ip_len > m->m_pkthdr.len)
283 || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
289 ip->ip_id = ip_randomid();
291 ip->ip_id = htons(ip_id++);
293 /* XXX prevent ip_output from overwriting header fields */
294 flags |= IP_RAWOUTPUT;
298 return (ip_output(m, inp->inp_options, &inp->inp_route, flags,
299 inp->inp_moptions, inp));
303 * Raw IP socket option processing.
306 rip_ctloutput(struct socket *so, struct sockopt *sopt)
308 struct inpcb *inp = sotoinpcb(so);
311 if (sopt->sopt_level != IPPROTO_IP)
316 switch (sopt->sopt_dir) {
318 switch (sopt->sopt_name) {
320 optval = inp->inp_flags & INP_HDRINCL;
321 error = sooptcopyout(sopt, &optval, sizeof optval);
324 case IP_FW_ADD: /* ADD actually returns the body... */
327 error = ip_fw_ctl_ptr(sopt);
332 case IP_DUMMYNET_GET:
334 error = ip_dn_ctl_ptr(sopt);
347 case MRT_API_SUPPORT:
349 case MRT_ADD_BW_UPCALL:
350 case MRT_DEL_BW_UPCALL:
351 error = ip_mrouter_get ? ip_mrouter_get(so, sopt) :
356 error = ip_ctloutput(so, sopt);
362 switch (sopt->sopt_name) {
364 error = sooptcopyin(sopt, &optval, sizeof optval,
369 inp->inp_flags |= INP_HDRINCL;
371 inp->inp_flags &= ~INP_HDRINCL;
380 error = ip_fw_ctl_ptr(sopt);
385 case IP_DUMMYNET_CONFIGURE:
386 case IP_DUMMYNET_DEL:
387 case IP_DUMMYNET_FLUSH:
389 error = ip_dn_ctl_ptr(sopt);
391 error = ENOPROTOOPT ;
395 error = ip_rsvp_init(so);
399 error = ip_rsvp_done();
403 case IP_RSVP_VIF_OFF:
404 error = ip_rsvp_vif ?
405 ip_rsvp_vif(so, sopt) : EINVAL;
416 case MRT_API_SUPPORT:
418 case MRT_ADD_BW_UPCALL:
419 case MRT_DEL_BW_UPCALL:
420 error = ip_mrouter_set ? ip_mrouter_set(so, sopt) :
425 error = ip_ctloutput(so, sopt);
435 * This function exists solely to receive the PRC_IFDOWN messages which
436 * are sent by if_down(). It looks for an ifaddr whose ifa_addr is sa,
437 * and calls in_ifadown() to remove all routes corresponding to that address.
438 * It also receives the PRC_IFUP messages from if_up() and reinstalls the
442 rip_ctlinput(int cmd, struct sockaddr *sa, void *vip)
444 struct in_ifaddr *ia;
451 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
452 if (ia->ia_ifa.ifa_addr == sa
453 && (ia->ia_flags & IFA_ROUTE)) {
455 * in_ifscrub kills the interface route.
457 in_ifscrub(ia->ia_ifp, ia);
459 * in_ifadown gets rid of all the rest of
460 * the routes. This is not quite the right
461 * thing to do, but at least if we are running
462 * a routing process they will come back.
464 in_ifadown(&ia->ia_ifa, 0);
471 TAILQ_FOREACH(ia, &in_ifaddrhead, ia_link) {
472 if (ia->ia_ifa.ifa_addr == sa)
475 if (ia == 0 || (ia->ia_flags & IFA_ROUTE))
478 ifp = ia->ia_ifa.ifa_ifp;
480 if ((ifp->if_flags & IFF_LOOPBACK)
481 || (ifp->if_flags & IFF_POINTOPOINT))
484 err = rtinit(&ia->ia_ifa, RTM_ADD, flags);
486 ia->ia_flags |= IFA_ROUTE;
491 u_long rip_sendspace = RIPSNDQ;
492 u_long rip_recvspace = RIPRCVQ;
494 SYSCTL_INT(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
495 &rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
496 SYSCTL_INT(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
497 &rip_recvspace, 0, "Maximum incoming raw IP datagram size");
500 rip_attach(struct socket *so, int proto, struct thread *td)
508 if ((error = suser(td)) != 0)
511 error = soreserve(so, rip_sendspace, rip_recvspace);
515 error = in_pcballoc(so, &ripcbinfo, td);
519 inp = (struct inpcb *)so->so_pcb;
520 inp->inp_vflag |= INP_IPV4;
521 inp->inp_ip_p = proto;
522 inp->inp_ip_ttl = ip_defttl;
527 rip_detach(struct socket *so)
534 if (so == ip_mrouter && ip_mrouter_done)
536 if (ip_rsvp_force_done)
537 ip_rsvp_force_done(so);
545 rip_abort(struct socket *so)
547 soisdisconnected(so);
548 if (so->so_state & SS_NOFDREF)
549 return rip_detach(so);
554 rip_disconnect(struct socket *so)
556 if ((so->so_state & SS_ISCONNECTED) == 0)
558 return rip_abort(so);
562 rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
564 struct inpcb *inp = sotoinpcb(so);
565 struct sockaddr_in *addr = (struct sockaddr_in *)nam;
567 if (nam->sa_len != sizeof(*addr))
570 if (TAILQ_EMPTY(&ifnet) || ((addr->sin_family != AF_INET) &&
571 (addr->sin_family != AF_IMPLINK)) ||
572 (addr->sin_addr.s_addr != INADDR_ANY &&
573 ifa_ifwithaddr((struct sockaddr *)addr) == 0))
574 return EADDRNOTAVAIL;
575 inp->inp_laddr = addr->sin_addr;
580 rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
582 struct inpcb *inp = sotoinpcb(so);
583 struct sockaddr_in *addr = (struct sockaddr_in *)nam;
585 if (nam->sa_len != sizeof(*addr))
587 if (TAILQ_EMPTY(&ifnet))
588 return EADDRNOTAVAIL;
589 if ((addr->sin_family != AF_INET) &&
590 (addr->sin_family != AF_IMPLINK))
592 inp->inp_faddr = addr->sin_addr;
598 rip_shutdown(struct socket *so)
605 rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
606 struct mbuf *control, struct thread *td)
608 struct inpcb *inp = sotoinpcb(so);
611 if (so->so_state & SS_ISCONNECTED) {
616 dst = inp->inp_faddr.s_addr;
622 dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
624 return rip_output(m, so, dst);
628 rip_pcblist(SYSCTL_HANDLER_ARGS)
631 struct inpcb *inp, **inp_list;
636 * The process of preparing the TCB list is too time-consuming and
637 * resource-intensive to repeat twice on every request.
639 if (req->oldptr == 0) {
640 n = ripcbinfo.ipi_count;
641 req->oldidx = 2 * (sizeof xig)
642 + (n + n/8) * sizeof(struct xinpcb);
646 if (req->newptr != 0)
650 * OK, now we're committed to doing something.
653 gencnt = ripcbinfo.ipi_gencnt;
654 n = ripcbinfo.ipi_count;
657 xig.xig_len = sizeof xig;
659 xig.xig_gen = gencnt;
660 xig.xig_sogen = so_gencnt;
661 error = SYSCTL_OUT(req, &xig, sizeof xig);
665 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK);
670 for (inp = LIST_FIRST(ripcbinfo.listhead), i = 0; inp && i < n;
671 inp = LIST_NEXT(inp, inp_list)) {
672 if (inp->inp_gencnt <= gencnt)
679 for (i = 0; i < n; i++) {
681 if (inp->inp_gencnt <= gencnt) {
683 xi.xi_len = sizeof xi;
684 /* XXX should avoid extra copy */
685 bcopy(inp, &xi.xi_inp, sizeof *inp);
687 sotoxsocket(inp->inp_socket, &xi.xi_socket);
688 error = SYSCTL_OUT(req, &xi, sizeof xi);
693 * Give the user an updated idea of our state.
694 * If the generation differs from what we told
695 * her before, she knows that something happened
696 * while we were processing this request, and it
697 * might be necessary to retry.
700 xig.xig_gen = ripcbinfo.ipi_gencnt;
701 xig.xig_sogen = so_gencnt;
702 xig.xig_count = ripcbinfo.ipi_count;
704 error = SYSCTL_OUT(req, &xig, sizeof xig);
706 free(inp_list, M_TEMP);
710 SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist, CTLFLAG_RD, 0, 0,
711 rip_pcblist, "S,xinpcb", "List of active raw IP sockets");
713 struct pr_usrreqs rip_usrreqs = {
714 rip_abort, pru_accept_notsupp, rip_attach, rip_bind, rip_connect,
715 pru_connect2_notsupp, in_control, rip_detach, rip_disconnect,
716 pru_listen_notsupp, in_setpeeraddr, pru_rcvd_notsupp,
717 pru_rcvoob_notsupp, rip_send, pru_sense_null, rip_shutdown,
718 in_setsockaddr, sosend, soreceive, sopoll