1 /* User-kernel network link */
3 /* See RFCs 791, 792, 1123 and 1812 */
5 /* The netlink device is actually a router. Tunnels are unnumbered
6 point-to-point lines (RFC1812 section 2.2.7); the router has a
7 single address (the 'router-id'). */
9 /* This is where we currently have the anti-spoofing paranoia - before
10 sending a packet to the kernel we check that the tunnel it came
11 over could reasonably have produced it. */
14 /* Points to note from RFC1812 (which may require changes in this
17 3.3.4 Maximum Transmission Unit - MTU
19 The MTU of each logical interface MUST be configurable within the
20 range of legal MTUs for the interface.
22 Many Link Layer protocols define a maximum frame size that may be
23 sent. In such cases, a router MUST NOT allow an MTU to be set which
24 would allow sending of frames larger than those allowed by the Link
25 Layer protocol. However, a router SHOULD be willing to receive a
26 packet as large as the maximum frame size even if that is larger than
29 4.2.1 A router SHOULD count datagrams discarded.
31 4.2.2.1 Source route options - we probably should implement processing
32 of source routes, even though mostly the security policy will prevent
35 5.3.13.4 Source Route Options
37 A router MUST implement support for source route options in forwarded
38 packets. A router MAY implement a configuration option that, when
39 enabled, causes all source-routed packets to be discarded. However,
40 such an option MUST NOT be enabled by default.
42 5.3.13.5 Record Route Option
44 Routers MUST support the Record Route option in forwarded packets.
46 A router MAY provide a configuration option that, if enabled, will
47 cause the router to ignore (i.e., pass through unchanged) Record
48 Route options in forwarded packets. If provided, such an option MUST
49 default to enabling the record-route. This option should not affect
50 the processing of Record Route options in datagrams received by the
51 router itself (in particular, Record Route options in ICMP echo
52 requests will still be processed according to Section [4.3.3.6]).
54 5.3.13.6 Timestamp Option
56 Routers MUST support the timestamp option in forwarded packets. A
57 timestamp value MUST follow the rules given [INTRO:2].
59 If the flags field = 3 (timestamp and prespecified address), the
60 router MUST add its timestamp if the next prespecified address
61 matches any of the router's IP addresses. It is not necessary that
62 the prespecified address be either the address of the interface on
63 which the packet arrived or the address of the interface over which
67 4.2.2.7 Fragmentation: RFC 791 Section 3.2
69 Fragmentation, as described in [INTERNET:1], MUST be supported by a
72 4.2.2.8 Reassembly: RFC 791 Section 3.2
74 As specified in the corresponding section of [INTRO:2], a router MUST
75 support reassembly of datagrams that it delivers to itself.
77 4.2.2.9 Time to Live: RFC 791 Section 3.2
79 Note in particular that a router MUST NOT check the TTL of a packet
80 except when forwarding it.
82 A router MUST NOT discard a datagram just because it was received
83 with TTL equal to zero or one; if it is to the router and otherwise
84 valid, the router MUST attempt to receive it.
86 On messages the router originates, the IP layer MUST provide a means
87 for the transport layer to set the TTL field of every datagram that
88 is sent. When a fixed TTL value is used, it MUST be configurable.
91 8.1 The Simple Network Management Protocol - SNMP
92 8.1.1 SNMP Protocol Elements
94 Routers MUST be manageable by SNMP [MGT:3]. The SNMP MUST operate
95 using UDP/IP as its transport and network protocols.
107 #define OPT_SOFTROUTE 1
108 #define OPT_ALLOWROUTE 2
110 #define ICMP_TYPE_ECHO_REPLY 0
112 #define ICMP_TYPE_UNREACHABLE 3
113 #define ICMP_CODE_NET_UNREACHABLE 0
114 #define ICMP_CODE_PROTOCOL_UNREACHABLE 2
115 #define ICMP_CODE_FRAGMENTATION_REQUIRED 4
116 #define ICMP_CODE_NET_PROHIBITED 13
118 #define ICMP_TYPE_ECHO_REQUEST 8
120 #define ICMP_TYPE_TIME_EXCEEDED 11
121 #define ICMP_CODE_TTL_EXCEEDED 0
123 /* Generic IP checksum routine */
124 static inline uint16_t ip_csum(uint8_t *iph,uint32_t count)
126 register uint32_t sum=0;
129 sum+=ntohs(*(uint16_t *)iph);
134 sum+=*(uint8_t *)iph;
136 sum=(sum&0xffff)+(sum>>16);
142 * This is a version of ip_compute_csum() optimized for IP headers,
143 * which always checksum on 4 octet boundaries.
145 * By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by
148 static inline uint16_t ip_fast_csum(uint8_t *iph, uint32_t ihl) {
151 __asm__ __volatile__(
157 "adcl 12(%1), %0 ;\n"
158 "1: adcl 16(%1), %0 ;\n"
169 /* Since the input registers which are loaded with iph and ipl
170 are modified, we must also specify them as outputs, or gcc
171 will assume they contain their original values. */
172 : "=r" (sum), "=r" (iph), "=r" (ihl)
173 : "1" (iph), "2" (ihl)
178 static inline uint16_t ip_fast_csum(uint8_t *iph, uint32_t ihl)
180 return ip_csum(iph,ihl*4);
185 #if defined (WORDS_BIGENDIAN)
201 /* The options start here. */
224 static void netlink_packet_deliver(struct netlink *st,
225 struct netlink_client *client,
226 struct buffer_if *buf);
228 /* XXX RFC1812 4.3.2.5:
229 All other ICMP error messages (Destination Unreachable,
230 Redirect, Time Exceeded, and Parameter Problem) SHOULD have their
231 precedence value set to 6 (INTERNETWORK CONTROL) or 7 (NETWORK
232 CONTROL). The IP Precedence value for these error messages MAY be
235 static struct icmphdr *netlink_icmp_tmpl(struct netlink *st,
236 uint32_t dest,uint16_t len)
240 BUF_ALLOC(&st->icmp,"netlink_icmp_tmpl");
241 buffer_init(&st->icmp,st->max_start_pad);
242 h=buf_append(&st->icmp,sizeof(*h));
247 h->iph.tot_len=htons(len+(h->iph.ihl*4)+8);
250 h->iph.ttl=255; /* XXX should be configurable */
252 h->iph.saddr=htonl(st->secnet_address);
253 h->iph.daddr=htonl(dest);
255 h->iph.check=ip_fast_csum((uint8_t *)&h->iph,h->iph.ihl);
262 /* Fill in the ICMP checksum field correctly */
263 static void netlink_icmp_csum(struct icmphdr *h)
267 len=ntohs(h->iph.tot_len)-(4*h->iph.ihl);
269 h->check=ip_csum(&h->type,len);
273 * An ICMP error message MUST NOT be sent as the result of
276 * * an ICMP error message, or
278 * * a datagram destined to an IP broadcast or IP multicast
281 * * a datagram sent as a link-layer broadcast, or
283 * * a non-initial fragment, or
285 * * a datagram whose source address does not define a single
286 * host -- e.g., a zero address, a loopback address, a
287 * broadcast address, a multicast address, or a Class E
290 static bool_t netlink_icmp_may_reply(struct buffer_if *buf)
293 struct icmphdr *icmph;
296 iph=(struct iphdr *)buf->start;
297 icmph=(struct icmphdr *)buf->start;
298 if (iph->protocol==1) {
299 switch(icmph->type) {
300 case 3: /* Destination unreachable */
301 case 11: /* Time Exceeded */
302 case 12: /* Parameter Problem */
306 /* How do we spot broadcast destination addresses? */
307 if (ntohs(iph->frag_off)&0x1fff) return False; /* Non-initial fragment */
308 source=ntohl(iph->saddr);
309 if (source==0) return False;
310 if ((source&0xff000000)==0x7f000000) return False;
311 /* How do we spot broadcast source addresses? */
312 if ((source&0xf0000000)==0xe0000000) return False; /* Multicast */
313 if ((source&0xf0000000)==0xf0000000) return False; /* Class E */
317 /* How much of the original IP packet do we include in its ICMP
318 response? The header plus up to 64 bits. */
321 4.3.2.3 Original Message Header
323 Historically, every ICMP error message has included the Internet
324 header and at least the first 8 data bytes of the datagram that
325 triggered the error. This is no longer adequate, due to the use of
326 IP-in-IP tunneling and other technologies. Therefore, the ICMP
327 datagram SHOULD contain as much of the original datagram as possible
328 without the length of the ICMP datagram exceeding 576 bytes. The
329 returned IP header (and user data) MUST be identical to that which
330 was received, except that the router is not required to undo any
331 modifications to the IP header that are normally performed in
332 forwarding that were performed before the error was detected (e.g.,
333 decrementing the TTL, or updating options). Note that the
334 requirements of Section [4.3.3.5] supersede this requirement in some
335 cases (i.e., for a Parameter Problem message, if the problem is in a
336 modified field, the router must undo the modification). See Section
339 static uint16_t netlink_icmp_reply_len(struct buffer_if *buf)
341 struct iphdr *iph=(struct iphdr *)buf->start;
345 /* We include the first 8 bytes of the packet data, provided they exist */
347 plen=ntohs(iph->tot_len);
348 return (hlen>plen?plen:hlen);
351 /* client indicates where the packet we're constructing a response to
352 comes from. NULL indicates the host. */
353 static void netlink_icmp_simple(struct netlink *st, struct buffer_if *buf,
354 struct netlink_client *client,
355 uint8_t type, uint8_t code)
357 struct iphdr *iph=(struct iphdr *)buf->start;
361 if (netlink_icmp_may_reply(buf)) {
362 len=netlink_icmp_reply_len(buf);
363 h=netlink_icmp_tmpl(st,ntohl(iph->saddr),len);
364 h->type=type; h->code=code;
365 memcpy(buf_append(&st->icmp,len),buf->start,len);
366 netlink_icmp_csum(h);
367 netlink_packet_deliver(st,NULL,&st->icmp);
368 BUF_ASSERT_FREE(&st->icmp);
373 * RFC1122: 3.1.2.2 MUST silently discard any IP frame that fails the
375 * RFC1812: 4.2.2.5 MUST discard messages containing invalid checksums.
377 * Is the datagram acceptable?
379 * 1. Length at least the size of an ip header
381 * 3. Checksums correctly.
382 * 4. Doesn't have a bogus length
384 static bool_t netlink_check(struct netlink *st, struct buffer_if *buf)
386 struct iphdr *iph=(struct iphdr *)buf->start;
389 if (iph->ihl < 5 || iph->version != 4) return False;
390 if (buf->size < iph->ihl*4) return False;
391 if (ip_fast_csum((uint8_t *)iph, iph->ihl)!=0) return False;
392 len=ntohs(iph->tot_len);
393 /* There should be no padding */
394 if (buf->size!=len || len<(iph->ihl<<2)) return False;
395 /* XXX check that there's no source route specified */
399 /* Deliver a packet. "client" is the _origin_ of the packet, not its
400 destination, and is NULL for packets from the host and packets
401 generated internally in secnet. */
402 static void netlink_packet_deliver(struct netlink *st,
403 struct netlink_client *client,
404 struct buffer_if *buf)
406 struct iphdr *iph=(struct iphdr *)buf->start;
407 uint32_t dest=ntohl(iph->daddr);
408 uint32_t source=ntohl(iph->saddr);
409 uint32_t best_quality;
410 bool_t allow_route=False;
411 bool_t found_allowed=False;
415 BUF_ASSERT_USED(buf);
417 if (dest==st->secnet_address) {
418 Message(M_ERR,"%s: trying to deliver a packet to myself!\n",st->name);
423 /* Packets from the host (client==NULL) may always be routed. Packets
424 from clients with the allow_route option will also be routed. */
425 if (!client || (client && (client->options & OPT_ALLOWROUTE)))
428 /* If !allow_route, we check the routing table anyway, and if
429 there's a suitable route with OPT_ALLOWROUTE set we use it. If
430 there's a suitable route, but none with OPT_ALLOWROUTE set then
431 we generate ICMP 'communication with destination network
432 administratively prohibited'. */
436 for (i=0; i<st->n_clients; i++) {
437 if (st->routes[i]->up &&
438 ipset_contains_addr(st->routes[i]->networks,dest)) {
439 /* It's an available route to the correct destination. But is
440 it better than the one we already have? */
442 /* If we have already found an allowed route then we don't
443 bother looking at routes we're not allowed to use. If
444 we don't yet have an allowed route we'll consider any. */
445 if (!allow_route && found_allowed) {
446 if (!(st->routes[i]->options&OPT_ALLOWROUTE)) continue;
449 if (st->routes[i]->link_quality>best_quality
450 || best_quality==0) {
451 best_quality=st->routes[i]->link_quality;
453 if (st->routes[i]->options&OPT_ALLOWROUTE)
455 /* If quality isn't perfect we may wish to
456 consider kicking the tunnel with a 0-length
457 packet to prompt it to perform a key setup.
458 Then it'll eventually decide it's up or
460 /* If quality is perfect and we're allowed to use the
461 route we don't need to search any more. */
462 if (best_quality>=MAXIMUM_LINK_QUALITY &&
463 (allow_route || found_allowed)) break;
467 if (best_match==-1) {
468 /* The packet's not going down a tunnel. It might (ought to)
470 if (ipset_contains_addr(st->networks,dest)) {
471 st->deliver_to_host(st->dst,buf);
473 BUF_ASSERT_FREE(buf);
476 s=ipaddr_to_string(source);
477 d=ipaddr_to_string(dest);
478 Message(M_DEBUG,"%s: don't know where to deliver packet "
479 "(s=%s, d=%s)\n", st->name, s, d);
481 netlink_icmp_simple(st,buf,client,ICMP_TYPE_UNREACHABLE,
482 ICMP_CODE_NET_UNREACHABLE);
487 !(st->routes[best_match]->options&OPT_ALLOWROUTE)) {
489 s=ipaddr_to_string(source);
490 d=ipaddr_to_string(dest);
491 /* We have a usable route but aren't allowed to use it.
492 Generate ICMP destination unreachable: communication
493 with destination network administratively prohibited */
494 Message(M_NOTICE,"%s: denied forwarding for packet (s=%s, d=%s)\n",
498 netlink_icmp_simple(st,buf,client,ICMP_TYPE_UNREACHABLE,
499 ICMP_CODE_NET_PROHIBITED);
502 if (best_quality>0) {
503 /* XXX Fragment if required */
504 st->routes[best_match]->deliver(
505 st->routes[best_match]->dst, buf);
506 st->routes[best_match]->outcount++;
507 BUF_ASSERT_FREE(buf);
509 /* Generate ICMP destination unreachable */
510 netlink_icmp_simple(st,buf,client,ICMP_TYPE_UNREACHABLE,
511 ICMP_CODE_NET_UNREACHABLE); /* client==NULL */
515 BUF_ASSERT_FREE(buf);
518 static void netlink_packet_forward(struct netlink *st,
519 struct netlink_client *client,
520 struct buffer_if *buf)
522 struct iphdr *iph=(struct iphdr *)buf->start;
524 BUF_ASSERT_USED(buf);
526 /* Packet has already been checked */
528 /* Generate ICMP time exceeded */
529 netlink_icmp_simple(st,buf,client,ICMP_TYPE_TIME_EXCEEDED,
530 ICMP_CODE_TTL_EXCEEDED);
536 iph->check=ip_fast_csum((uint8_t *)iph,iph->ihl);
538 netlink_packet_deliver(st,client,buf);
539 BUF_ASSERT_FREE(buf);
542 /* Deal with packets addressed explicitly to us */
543 static void netlink_packet_local(struct netlink *st,
544 struct netlink_client *client,
545 struct buffer_if *buf)
551 h=(struct icmphdr *)buf->start;
553 if ((ntohs(h->iph.frag_off)&0xbfff)!=0) {
554 Message(M_WARNING,"%s: fragmented packet addressed to secnet; "
555 "ignoring it\n",st->name);
560 if (h->iph.protocol==1) {
562 if (h->type==ICMP_TYPE_ECHO_REQUEST && h->code==0) {
563 /* ICMP echo-request. Special case: we re-use the buffer
564 to construct the reply. */
565 h->type=ICMP_TYPE_ECHO_REPLY;
566 h->iph.daddr=h->iph.saddr;
567 h->iph.saddr=htonl(st->secnet_address);
570 h->iph.check=ip_fast_csum((uint8_t *)h,h->iph.ihl);
571 netlink_icmp_csum(h);
572 netlink_packet_deliver(st,NULL,buf);
575 Message(M_WARNING,"%s: unknown incoming ICMP\n",st->name);
577 /* Send ICMP protocol unreachable */
578 netlink_icmp_simple(st,buf,client,ICMP_TYPE_UNREACHABLE,
579 ICMP_CODE_PROTOCOL_UNREACHABLE);
587 /* If cid==NULL packet is from host, otherwise cid specifies which tunnel
589 static void netlink_incoming(struct netlink *st, struct netlink_client *client,
590 struct buffer_if *buf)
592 uint32_t source,dest;
595 BUF_ASSERT_USED(buf);
596 if (!netlink_check(st,buf)) {
597 Message(M_WARNING,"%s: bad IP packet from %s\n",
598 st->name,client?client->name:"host");
602 iph=(struct iphdr *)buf->start;
604 source=ntohl(iph->saddr);
605 dest=ntohl(iph->daddr);
607 /* Check source. If we don't like the source, there's no point
608 generating ICMP because we won't know how to get it to the
609 source of the packet. */
611 /* Check that the packet source is appropriate for the tunnel
613 if (!ipset_contains_addr(client->networks,source)) {
615 s=ipaddr_to_string(source);
616 d=ipaddr_to_string(dest);
617 Message(M_WARNING,"%s: packet from tunnel %s with bad "
618 "source address (s=%s,d=%s)\n",st->name,client->name,s,d);
624 /* Check that the packet originates in our configured local
625 network, and hasn't been forwarded from elsewhere or
626 generated with the wrong source address */
627 if (!ipset_contains_addr(st->networks,source)) {
629 s=ipaddr_to_string(source);
630 d=ipaddr_to_string(dest);
631 Message(M_WARNING,"%s: outgoing packet with bad source address "
632 "(s=%s,d=%s)\n",st->name,s,d);
639 /* If this is a point-to-point device we don't examine the
640 destination address at all; we blindly send it down our
641 one-and-only registered tunnel, or to the host, depending on
642 where it came from. It's up to external software to check
643 address validity and generate ICMP, etc. */
646 st->deliver_to_host(st->dst,buf);
648 st->clients->deliver(st->clients->dst,buf);
650 BUF_ASSERT_FREE(buf);
654 /* st->secnet_address needs checking before matching destination
656 if (dest==st->secnet_address) {
657 netlink_packet_local(st,client,buf);
658 BUF_ASSERT_FREE(buf);
661 netlink_packet_forward(st,client,buf);
662 BUF_ASSERT_FREE(buf);
665 static void netlink_inst_incoming(void *sst, struct buffer_if *buf)
667 struct netlink_client *c=sst;
668 struct netlink *st=c->nst;
670 netlink_incoming(st,c,buf);
673 static void netlink_dev_incoming(void *sst, struct buffer_if *buf)
675 struct netlink *st=sst;
677 netlink_incoming(st,NULL,buf);
680 static void netlink_set_quality(void *sst, uint32_t quality)
682 struct netlink_client *c=sst;
683 struct netlink *st=c->nst;
685 c->link_quality=quality;
686 c->up=(c->link_quality==LINK_QUALITY_DOWN)?False:True;
687 if (c->options&OPT_SOFTROUTE) {
688 st->set_routes(st->dst,c);
692 static void netlink_output_subnets(struct netlink *st, uint32_t loglevel,
693 struct subnet_list *snets)
698 for (i=0; i<snets->entries; i++) {
699 net=subnet_to_string(snets->list[i]);
700 Message(loglevel,"%s ",net);
705 static void netlink_dump_routes(struct netlink *st, bool_t requested)
711 if (requested) c=M_WARNING;
713 net=ipaddr_to_string(st->secnet_address);
714 Message(c,"%s: point-to-point (remote end is %s); routes:\n",
717 netlink_output_subnets(st,c,st->clients->subnets);
720 Message(c,"%s: routing table:\n",st->name);
721 for (i=0; i<st->n_clients; i++) {
722 netlink_output_subnets(st,c,st->routes[i]->subnets);
723 Message(c,"-> tunnel %s (%s,mtu %d,%s routes,%s,"
724 "quality %d,use %d)\n",
726 st->routes[i]->up?"up":"down",
728 st->routes[i]->options&OPT_SOFTROUTE?"soft":"hard",
729 st->routes[i]->options&OPT_ALLOWROUTE?"free":"restricted",
730 st->routes[i]->link_quality,
731 st->routes[i]->outcount);
733 net=ipaddr_to_string(st->secnet_address);
734 Message(c,"%s/32 -> netlink \"%s\" (use %d)\n",
735 net,st->name,st->localcount);
737 for (i=0; i<st->subnets->entries; i++) {
738 net=subnet_to_string(st->subnets->list[i]);
739 Message(c,"%s ",net);
743 Message(c,"-> host (use %d)\n",st->outcount);
747 /* ap is a pointer to a member of the routes array */
748 static int netlink_compare_client_priority(const void *ap, const void *bp)
750 const struct netlink_client *const*a=ap;
751 const struct netlink_client *const*b=bp;
753 if ((*a)->priority==(*b)->priority) return 0;
754 if ((*a)->priority<(*b)->priority) return 1;
758 static void netlink_phase_hook(void *sst, uint32_t new_phase)
760 struct netlink *st=sst;
761 struct netlink_client *c;
764 /* All the networks serviced by the various tunnels should now
765 * have been registered. We build a routing table by sorting the
766 * clients by priority. */
767 st->routes=safe_malloc(st->n_clients*sizeof(*st->routes),
768 "netlink_phase_hook");
771 for (c=st->clients; c; c=c->next)
773 /* Sort the table in descending order of priority */
774 qsort(st->routes,st->n_clients,sizeof(*st->routes),
775 netlink_compare_client_priority);
777 netlink_dump_routes(st,False);
780 static void netlink_signal_handler(void *sst, int signum)
782 struct netlink *st=sst;
783 Message(M_INFO,"%s: route dump requested by SIGUSR1\n",st->name);
784 netlink_dump_routes(st,True);
787 static void netlink_inst_output_config(void *sst, struct buffer_if *buf)
789 /* struct netlink_client *c=sst; */
790 /* struct netlink *st=c->nst; */
792 /* For now we don't output anything */
793 BUF_ASSERT_USED(buf);
796 static bool_t netlink_inst_check_config(void *sst, struct buffer_if *buf)
798 /* struct netlink_client *c=sst; */
799 /* struct netlink *st=c->nst; */
801 BUF_ASSERT_USED(buf);
802 /* We need to eat all of the configuration information from the buffer
803 for backward compatibility. */
808 static void netlink_inst_set_mtu(void *sst, uint32_t new_mtu)
810 struct netlink_client *c=sst;
815 static void netlink_inst_reg(void *sst, netlink_deliver_fn *deliver,
816 void *dst, uint32_t max_start_pad,
817 uint32_t max_end_pad)
819 struct netlink_client *c=sst;
820 struct netlink *st=c->nst;
822 if (max_start_pad > st->max_start_pad) st->max_start_pad=max_start_pad;
823 if (max_end_pad > st->max_end_pad) st->max_end_pad=max_end_pad;
828 static struct flagstr netlink_option_table[]={
829 { "soft", OPT_SOFTROUTE },
830 { "allow-route", OPT_ALLOWROUTE },
833 /* This is the routine that gets called when the closure that's
834 returned by an invocation of a netlink device closure (eg. tun,
835 userv-ipif) is invoked. It's used to create routes and pass in
836 information about them; the closure it returns is used by site
838 static closure_t *netlink_inst_create(struct netlink *st,
839 struct cloc loc, dict_t *dict)
841 struct netlink_client *c;
843 struct ipset *networks;
844 uint32_t options,priority,mtu;
847 name=dict_read_string(dict, "name", True, st->name, loc);
849 l=dict_lookup(dict,"routes");
851 cfgfatal(loc,st->name,"required parameter \"routes\" not found\n");
852 networks=string_list_to_ipset(l,loc,st->name,"routes");
853 options=string_list_to_word(dict_lookup(dict,"options"),
854 netlink_option_table,st->name);
856 priority=dict_read_number(dict,"priority",False,st->name,loc,0);
857 mtu=dict_read_number(dict,"mtu",False,st->name,loc,0);
859 if ((options&OPT_SOFTROUTE) && !st->set_routes) {
860 cfgfatal(loc,st->name,"this netlink device does not support "
865 if (options&OPT_SOFTROUTE) {
866 /* XXX for now we assume that soft routes require root privilege;
867 this may not always be true. The device driver can tell us. */
868 require_root_privileges=True;
869 require_root_privileges_explanation="netlink: soft routes";
871 cfgfatal(loc,st->name,"point-to-point netlinks do not support "
877 /* Check that nets are a subset of st->remote_networks;
878 refuse to register if they are not. */
879 if (!ipset_is_subset(st->remote_networks,networks)) {
880 cfgfatal(loc,st->name,"routes are not allowed\n");
884 c=safe_malloc(sizeof(*c),"netlink_inst_create");
885 c->cl.description=name;
886 c->cl.type=CL_NETLINK;
888 c->cl.interface=&c->ops;
890 c->ops.reg=netlink_inst_reg;
891 c->ops.deliver=netlink_inst_incoming;
892 c->ops.set_quality=netlink_set_quality;
893 c->ops.output_config=netlink_inst_output_config;
894 c->ops.check_config=netlink_inst_check_config;
895 c->ops.set_mtu=netlink_inst_set_mtu;
898 c->networks=networks;
899 c->subnets=ipset_to_subnet_list(networks);
900 c->priority=priority;
904 c->link_quality=LINK_QUALITY_DOWN;
905 c->mtu=mtu?mtu:st->mtu;
917 static list_t *netlink_inst_apply(closure_t *self, struct cloc loc,
918 dict_t *context, list_t *args)
920 struct netlink *st=self->interface;
926 item=list_elem(args,0);
927 if (!item || item->type!=t_dict) {
928 cfgfatal(loc,st->name,"must have a dictionary argument\n");
930 dict=item->data.dict;
932 cl=netlink_inst_create(st,loc,dict);
934 return new_closure(cl);
937 netlink_deliver_fn *netlink_init(struct netlink *st,
938 void *dst, struct cloc loc,
939 dict_t *dict, cstring_t description,
940 netlink_route_fn *set_routes,
941 netlink_deliver_fn *to_host)
947 st->cl.description=description;
949 st->cl.apply=netlink_inst_apply;
956 st->set_routes=set_routes;
957 st->deliver_to_host=to_host;
959 st->name=dict_read_string(dict,"name",False,description,loc);
960 if (!st->name) st->name=description;
961 l=dict_lookup(dict,"networks");
963 st->networks=string_list_to_ipset(l,loc,st->name,"networks");
967 st->networks=ipset_complement(empty);
970 l=dict_lookup(dict,"remote-networks");
972 st->remote_networks=string_list_to_ipset(l,loc,st->name,
977 st->remote_networks=ipset_complement(empty);
981 sa=dict_find_item(dict,"secnet-address",False,"netlink",loc);
982 ptpa=dict_find_item(dict,"ptp-address",False,"netlink",loc);
984 cfgfatal(loc,st->name,"you may not specify secnet-address and "
985 "ptp-address in the same netlink device\n");
988 cfgfatal(loc,st->name,"you must specify secnet-address or "
989 "ptp-address for this netlink device\n");
992 st->secnet_address=string_item_to_ipaddr(sa,"netlink");
995 st->secnet_address=string_item_to_ipaddr(ptpa,"netlink");
998 /* To be strictly correct we could subtract secnet_address from
999 networks here. It shouldn't make any practical difference,
1000 though, and will make the route dump look complicated... */
1001 st->subnets=ipset_to_subnet_list(st->networks);
1002 st->mtu=dict_read_number(dict, "mtu", False, "netlink", loc, DEFAULT_MTU);
1003 buffer_new(&st->icmp,ICMP_BUFSIZE);
1007 add_hook(PHASE_SETUP,netlink_phase_hook,st);
1008 request_signal_notification(SIGUSR1, netlink_signal_handler, st);
1010 /* If we're point-to-point then we return a CL_NETLINK directly,
1011 rather than a CL_NETLINK_OLD or pure closure (depending on
1012 compatibility). This CL_NETLINK is for our one and only
1013 client. Our cl.apply function is NULL. */
1016 cl=netlink_inst_create(st,loc,dict);
1019 return netlink_dev_incoming;
1022 /* No connection to the kernel at all... */
1028 static bool_t null_set_route(void *sst, struct netlink_client *routes)
1030 struct null *st=sst;
1032 if (routes->up!=routes->kup) {
1033 Message(M_INFO,"%s: setting routes for tunnel %s to state %s\n",
1034 st->nl.name,routes->name,
1035 routes->up?"up":"down");
1036 routes->kup=routes->up;
1042 static void null_deliver(void *sst, struct buffer_if *buf)
1047 static list_t *null_apply(closure_t *self, struct cloc loc, dict_t *context,
1054 st=safe_malloc(sizeof(*st),"null_apply");
1056 item=list_elem(args,0);
1057 if (!item || item->type!=t_dict)
1058 cfgfatal(loc,"null-netlink","parameter must be a dictionary\n");
1060 dict=item->data.dict;
1062 netlink_init(&st->nl,st,loc,dict,"null-netlink",null_set_route,
1065 return new_closure(&st->nl.cl);
1068 init_module netlink_module;
1069 void netlink_module(dict_t *dict)
1071 add_closure(dict,"null-netlink",null_apply);