Commit | Line | Data |
---|---|---|
2fe58dfd SE |
1 | /* User-kernel network link */ |
2 | ||
ff05a229 | 3 | /* See RFCs 791, 792, 1123 and 1812 */ |
2fe58dfd | 4 | |
ff05a229 SE |
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'). */ | |
8 | ||
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. */ | |
12 | ||
13 | ||
14 | /* Points to note from RFC1812 (which may require changes in this | |
15 | file): | |
16 | ||
17 | 3.3.4 Maximum Transmission Unit - MTU | |
18 | ||
19 | The MTU of each logical interface MUST be configurable within the | |
20 | range of legal MTUs for the interface. | |
21 | ||
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 | |
27 | the MTU. | |
28 | ||
29 | 4.2.1 A router SHOULD count datagrams discarded. | |
30 | ||
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 | |
33 | their use. | |
34 | ||
35 | 5.3.13.4 Source Route Options | |
36 | ||
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. | |
41 | ||
42 | 5.3.13.5 Record Route Option | |
43 | ||
44 | Routers MUST support the Record Route option in forwarded packets. | |
45 | ||
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]). | |
53 | ||
54 | 5.3.13.6 Timestamp Option | |
55 | ||
56 | Routers MUST support the timestamp option in forwarded packets. A | |
57 | timestamp value MUST follow the rules given [INTRO:2]. | |
58 | ||
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 | |
64 | it will be sent. | |
65 | ||
66 | ||
67 | 4.2.2.7 Fragmentation: RFC 791 Section 3.2 | |
68 | ||
69 | Fragmentation, as described in [INTERNET:1], MUST be supported by a | |
70 | router. | |
71 | ||
72 | 4.2.2.8 Reassembly: RFC 791 Section 3.2 | |
73 | ||
74 | As specified in the corresponding section of [INTRO:2], a router MUST | |
75 | support reassembly of datagrams that it delivers to itself. | |
76 | ||
77 | 4.2.2.9 Time to Live: RFC 791 Section 3.2 | |
78 | ||
79 | Note in particular that a router MUST NOT check the TTL of a packet | |
80 | except when forwarding it. | |
81 | ||
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. | |
85 | ||
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. | |
89 | ||
90 | ||
91 | 8.1 The Simple Network Management Protocol - SNMP | |
92 | 8.1.1 SNMP Protocol Elements | |
93 | ||
94 | Routers MUST be manageable by SNMP [MGT:3]. The SNMP MUST operate | |
95 | using UDP/IP as its transport and network protocols. | |
96 | ||
97 | ||
98 | */ | |
2fe58dfd | 99 | |
3b83c932 | 100 | #include <string.h> |
59230b9b IJ |
101 | #include <assert.h> |
102 | #include <limits.h> | |
8689b3a9 | 103 | #include "secnet.h" |
2fe58dfd | 104 | #include "util.h" |
7138d0c5 | 105 | #include "ipaddr.h" |
9d3a4132 | 106 | #include "netlink.h" |
042a8da9 | 107 | #include "process.h" |
2fe58dfd | 108 | |
ff05a229 SE |
109 | #define ICMP_TYPE_ECHO_REPLY 0 |
110 | ||
111 | #define ICMP_TYPE_UNREACHABLE 3 | |
112 | #define ICMP_CODE_NET_UNREACHABLE 0 | |
113 | #define ICMP_CODE_PROTOCOL_UNREACHABLE 2 | |
114 | #define ICMP_CODE_FRAGMENTATION_REQUIRED 4 | |
115 | #define ICMP_CODE_NET_PROHIBITED 13 | |
116 | ||
117 | #define ICMP_TYPE_ECHO_REQUEST 8 | |
118 | ||
119 | #define ICMP_TYPE_TIME_EXCEEDED 11 | |
120 | #define ICMP_CODE_TTL_EXCEEDED 0 | |
121 | ||
4efd681a | 122 | /* Generic IP checksum routine */ |
1caa23ff | 123 | static inline uint16_t ip_csum(uint8_t *iph,int32_t count) |
2fe58dfd | 124 | { |
4efd681a SE |
125 | register uint32_t sum=0; |
126 | ||
127 | while (count>1) { | |
128 | sum+=ntohs(*(uint16_t *)iph); | |
129 | iph+=2; | |
130 | count-=2; | |
131 | } | |
132 | if(count>0) | |
133 | sum+=*(uint8_t *)iph; | |
134 | while (sum>>16) | |
135 | sum=(sum&0xffff)+(sum>>16); | |
136 | return htons(~sum); | |
2fe58dfd SE |
137 | } |
138 | ||
4efd681a SE |
139 | #ifdef i386 |
140 | /* | |
141 | * This is a version of ip_compute_csum() optimized for IP headers, | |
142 | * which always checksum on 4 octet boundaries. | |
143 | * | |
144 | * By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by | |
145 | * Arnt Gulbrandsen. | |
146 | */ | |
1caa23ff | 147 | static inline uint16_t ip_fast_csum(uint8_t *iph, int32_t ihl) { |
4efd681a SE |
148 | uint32_t sum; |
149 | ||
20d324b6 SE |
150 | __asm__ __volatile__( |
151 | "movl (%1), %0 ;\n" | |
152 | "subl $4, %2 ;\n" | |
153 | "jbe 2f ;\n" | |
154 | "addl 4(%1), %0 ;\n" | |
155 | "adcl 8(%1), %0 ;\n" | |
156 | "adcl 12(%1), %0 ;\n" | |
157 | "1: adcl 16(%1), %0 ;\n" | |
158 | "lea 4(%1), %1 ;\n" | |
159 | "decl %2 ;\n" | |
160 | "jne 1b ;\n" | |
161 | "adcl $0, %0 ;\n" | |
162 | "movl %0, %2 ;\n" | |
163 | "shrl $16, %0 ;\n" | |
164 | "addw %w2, %w0 ;\n" | |
165 | "adcl $0, %0 ;\n" | |
166 | "notl %0 ;\n" | |
167 | "2: ;\n" | |
4efd681a SE |
168 | /* Since the input registers which are loaded with iph and ipl |
169 | are modified, we must also specify them as outputs, or gcc | |
170 | will assume they contain their original values. */ | |
171 | : "=r" (sum), "=r" (iph), "=r" (ihl) | |
20d324b6 SE |
172 | : "1" (iph), "2" (ihl) |
173 | : "memory"); | |
4efd681a SE |
174 | return sum; |
175 | } | |
176 | #else | |
1caa23ff | 177 | static inline uint16_t ip_fast_csum(uint8_t *iph, int32_t ihl) |
2fe58dfd | 178 | { |
1caa23ff | 179 | assert(ihl < INT_MAX/4); |
4efd681a SE |
180 | return ip_csum(iph,ihl*4); |
181 | } | |
182 | #endif | |
183 | ||
184 | struct iphdr { | |
185 | #if defined (WORDS_BIGENDIAN) | |
186 | uint8_t version:4, | |
187 | ihl:4; | |
188 | #else | |
189 | uint8_t ihl:4, | |
190 | version:4; | |
191 | #endif | |
192 | uint8_t tos; | |
193 | uint16_t tot_len; | |
194 | uint16_t id; | |
195 | uint16_t frag_off; | |
196 | uint8_t ttl; | |
197 | uint8_t protocol; | |
198 | uint16_t check; | |
199 | uint32_t saddr; | |
200 | uint32_t daddr; | |
201 | /* The options start here. */ | |
202 | }; | |
203 | ||
204 | struct icmphdr { | |
205 | struct iphdr iph; | |
206 | uint8_t type; | |
207 | uint8_t code; | |
208 | uint16_t check; | |
209 | union { | |
210 | uint32_t unused; | |
211 | struct { | |
212 | uint8_t pointer; | |
213 | uint8_t unused1; | |
214 | uint16_t unused2; | |
215 | } pprob; | |
216 | uint32_t gwaddr; | |
217 | struct { | |
218 | uint16_t id; | |
219 | uint16_t seq; | |
220 | } echo; | |
221 | } d; | |
222 | }; | |
223 | ||
70dc107b SE |
224 | static void netlink_packet_deliver(struct netlink *st, |
225 | struct netlink_client *client, | |
226 | struct buffer_if *buf); | |
4efd681a | 227 | |
ff05a229 SE |
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 | |
233 | settable. | |
234 | */ | |
4efd681a SE |
235 | static struct icmphdr *netlink_icmp_tmpl(struct netlink *st, |
236 | uint32_t dest,uint16_t len) | |
237 | { | |
238 | struct icmphdr *h; | |
239 | ||
240 | BUF_ALLOC(&st->icmp,"netlink_icmp_tmpl"); | |
3abd18e8 | 241 | buffer_init(&st->icmp,calculate_max_start_pad()); |
4efd681a SE |
242 | h=buf_append(&st->icmp,sizeof(*h)); |
243 | ||
244 | h->iph.version=4; | |
245 | h->iph.ihl=5; | |
246 | h->iph.tos=0; | |
247 | h->iph.tot_len=htons(len+(h->iph.ihl*4)+8); | |
248 | h->iph.id=0; | |
249 | h->iph.frag_off=0; | |
ff05a229 | 250 | h->iph.ttl=255; /* XXX should be configurable */ |
4efd681a SE |
251 | h->iph.protocol=1; |
252 | h->iph.saddr=htonl(st->secnet_address); | |
253 | h->iph.daddr=htonl(dest); | |
254 | h->iph.check=0; | |
255 | h->iph.check=ip_fast_csum((uint8_t *)&h->iph,h->iph.ihl); | |
256 | h->check=0; | |
257 | h->d.unused=0; | |
258 | ||
259 | return h; | |
260 | } | |
261 | ||
262 | /* Fill in the ICMP checksum field correctly */ | |
263 | static void netlink_icmp_csum(struct icmphdr *h) | |
264 | { | |
1caa23ff | 265 | int32_t len; |
4efd681a SE |
266 | |
267 | len=ntohs(h->iph.tot_len)-(4*h->iph.ihl); | |
268 | h->check=0; | |
269 | h->check=ip_csum(&h->type,len); | |
270 | } | |
271 | ||
272 | /* RFC1122: | |
273 | * An ICMP error message MUST NOT be sent as the result of | |
274 | * receiving: | |
275 | * | |
276 | * * an ICMP error message, or | |
277 | * | |
278 | * * a datagram destined to an IP broadcast or IP multicast | |
279 | * address, or | |
280 | * | |
281 | * * a datagram sent as a link-layer broadcast, or | |
282 | * | |
283 | * * a non-initial fragment, or | |
284 | * | |
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 | |
288 | * address. | |
289 | */ | |
290 | static bool_t netlink_icmp_may_reply(struct buffer_if *buf) | |
291 | { | |
292 | struct iphdr *iph; | |
8dea8d37 | 293 | struct icmphdr *icmph; |
4efd681a SE |
294 | uint32_t source; |
295 | ||
975820aa | 296 | if (buf->size < (int)sizeof(struct icmphdr)) return False; |
4efd681a | 297 | iph=(struct iphdr *)buf->start; |
8dea8d37 SE |
298 | icmph=(struct icmphdr *)buf->start; |
299 | if (iph->protocol==1) { | |
300 | switch(icmph->type) { | |
301 | case 3: /* Destination unreachable */ | |
302 | case 11: /* Time Exceeded */ | |
303 | case 12: /* Parameter Problem */ | |
304 | return False; | |
305 | } | |
306 | } | |
4efd681a SE |
307 | /* How do we spot broadcast destination addresses? */ |
308 | if (ntohs(iph->frag_off)&0x1fff) return False; /* Non-initial fragment */ | |
309 | source=ntohl(iph->saddr); | |
310 | if (source==0) return False; | |
311 | if ((source&0xff000000)==0x7f000000) return False; | |
312 | /* How do we spot broadcast source addresses? */ | |
313 | if ((source&0xf0000000)==0xe0000000) return False; /* Multicast */ | |
314 | if ((source&0xf0000000)==0xf0000000) return False; /* Class E */ | |
315 | return True; | |
316 | } | |
317 | ||
318 | /* How much of the original IP packet do we include in its ICMP | |
319 | response? The header plus up to 64 bits. */ | |
ff05a229 SE |
320 | |
321 | /* XXX TODO RFC1812: | |
322 | 4.3.2.3 Original Message Header | |
323 | ||
324 | Historically, every ICMP error message has included the Internet | |
325 | header and at least the first 8 data bytes of the datagram that | |
326 | triggered the error. This is no longer adequate, due to the use of | |
327 | IP-in-IP tunneling and other technologies. Therefore, the ICMP | |
328 | datagram SHOULD contain as much of the original datagram as possible | |
329 | without the length of the ICMP datagram exceeding 576 bytes. The | |
330 | returned IP header (and user data) MUST be identical to that which | |
331 | was received, except that the router is not required to undo any | |
332 | modifications to the IP header that are normally performed in | |
333 | forwarding that were performed before the error was detected (e.g., | |
334 | decrementing the TTL, or updating options). Note that the | |
335 | requirements of Section [4.3.3.5] supersede this requirement in some | |
336 | cases (i.e., for a Parameter Problem message, if the problem is in a | |
337 | modified field, the router must undo the modification). See Section | |
338 | [4.3.3.5]). | |
339 | */ | |
4efd681a SE |
340 | static uint16_t netlink_icmp_reply_len(struct buffer_if *buf) |
341 | { | |
975820aa | 342 | if (buf->size < (int)sizeof(struct iphdr)) return 0; |
4efd681a SE |
343 | struct iphdr *iph=(struct iphdr *)buf->start; |
344 | uint16_t hlen,plen; | |
345 | ||
346 | hlen=iph->ihl*4; | |
347 | /* We include the first 8 bytes of the packet data, provided they exist */ | |
348 | hlen+=8; | |
349 | plen=ntohs(iph->tot_len); | |
350 | return (hlen>plen?plen:hlen); | |
351 | } | |
352 | ||
70dc107b SE |
353 | /* client indicates where the packet we're constructing a response to |
354 | comes from. NULL indicates the host. */ | |
4efd681a | 355 | static void netlink_icmp_simple(struct netlink *st, struct buffer_if *buf, |
70dc107b | 356 | struct netlink_client *client, |
4efd681a SE |
357 | uint8_t type, uint8_t code) |
358 | { | |
4efd681a SE |
359 | struct icmphdr *h; |
360 | uint16_t len; | |
361 | ||
362 | if (netlink_icmp_may_reply(buf)) { | |
975820aa | 363 | struct iphdr *iph=(struct iphdr *)buf->start; |
4efd681a SE |
364 | len=netlink_icmp_reply_len(buf); |
365 | h=netlink_icmp_tmpl(st,ntohl(iph->saddr),len); | |
366 | h->type=type; h->code=code; | |
367 | memcpy(buf_append(&st->icmp,len),buf->start,len); | |
368 | netlink_icmp_csum(h); | |
70dc107b | 369 | netlink_packet_deliver(st,NULL,&st->icmp); |
4efd681a SE |
370 | BUF_ASSERT_FREE(&st->icmp); |
371 | } | |
372 | } | |
373 | ||
374 | /* | |
375 | * RFC1122: 3.1.2.2 MUST silently discard any IP frame that fails the | |
376 | * checksum. | |
ff05a229 | 377 | * RFC1812: 4.2.2.5 MUST discard messages containing invalid checksums. |
4efd681a SE |
378 | * |
379 | * Is the datagram acceptable? | |
380 | * | |
381 | * 1. Length at least the size of an ip header | |
382 | * 2. Version of 4 | |
383 | * 3. Checksums correctly. | |
384 | * 4. Doesn't have a bogus length | |
385 | */ | |
d714da29 IJ |
386 | static bool_t netlink_check(struct netlink *st, struct buffer_if *buf, |
387 | char *errmsgbuf, int errmsgbuflen) | |
4efd681a | 388 | { |
d714da29 IJ |
389 | #define BAD(...) do{ \ |
390 | snprintf(errmsgbuf,errmsgbuflen,__VA_ARGS__); \ | |
391 | return False; \ | |
392 | }while(0) | |
393 | ||
975820aa | 394 | if (buf->size < (int)sizeof(struct iphdr)) BAD("len %"PRIu32"",buf->size); |
4efd681a | 395 | struct iphdr *iph=(struct iphdr *)buf->start; |
1caa23ff | 396 | int32_t len; |
4efd681a | 397 | |
d714da29 IJ |
398 | if (iph->ihl < 5) BAD("ihl %u",iph->ihl); |
399 | if (iph->version != 4) BAD("version %u",iph->version); | |
400 | if (buf->size < iph->ihl*4) BAD("size %"PRId32"<%u*4",buf->size,iph->ihl); | |
401 | if (ip_fast_csum((uint8_t *)iph, iph->ihl)!=0) BAD("csum"); | |
4efd681a SE |
402 | len=ntohs(iph->tot_len); |
403 | /* There should be no padding */ | |
d714da29 IJ |
404 | if (buf->size!=len) BAD("len %"PRId32"!=%"PRId32,buf->size,len); |
405 | if (len<(iph->ihl<<2)) BAD("len %"PRId32"<(%u<<2)",len,iph->ihl); | |
4efd681a SE |
406 | /* XXX check that there's no source route specified */ |
407 | return True; | |
d714da29 IJ |
408 | |
409 | #undef BAD | |
4efd681a SE |
410 | } |
411 | ||
469fd1d9 | 412 | /* Deliver a packet. "client" is the _origin_ of the packet, not its |
d3fe100d SE |
413 | destination, and is NULL for packets from the host and packets |
414 | generated internally in secnet. */ | |
70dc107b SE |
415 | static void netlink_packet_deliver(struct netlink *st, |
416 | struct netlink_client *client, | |
417 | struct buffer_if *buf) | |
4efd681a | 418 | { |
975820aa IJ |
419 | if (buf->size < (int)sizeof(struct iphdr)) { |
420 | Message(M_ERR,"%s: trying to deliver a too-short packet" | |
421 | " from %s!\n",st->name, client?client->name:"(local)"); | |
422 | BUF_FREE(buf); | |
423 | return; | |
424 | } | |
425 | ||
4efd681a SE |
426 | struct iphdr *iph=(struct iphdr *)buf->start; |
427 | uint32_t dest=ntohl(iph->daddr); | |
70dc107b SE |
428 | uint32_t source=ntohl(iph->saddr); |
429 | uint32_t best_quality; | |
469fd1d9 SE |
430 | bool_t allow_route=False; |
431 | bool_t found_allowed=False; | |
70dc107b SE |
432 | int best_match; |
433 | int i; | |
2fe58dfd | 434 | |
4efd681a | 435 | BUF_ASSERT_USED(buf); |
2fe58dfd | 436 | |
4efd681a | 437 | if (dest==st->secnet_address) { |
4f5e39ec | 438 | Message(M_ERR,"%s: trying to deliver a packet to myself!\n",st->name); |
4efd681a | 439 | BUF_FREE(buf); |
2fe58dfd SE |
440 | return; |
441 | } | |
4efd681a | 442 | |
d3fe100d | 443 | /* Packets from the host (client==NULL) may always be routed. Packets |
469fd1d9 SE |
444 | from clients with the allow_route option will also be routed. */ |
445 | if (!client || (client && (client->options & OPT_ALLOWROUTE))) | |
446 | allow_route=True; | |
447 | ||
448 | /* If !allow_route, we check the routing table anyway, and if | |
449 | there's a suitable route with OPT_ALLOWROUTE set we use it. If | |
450 | there's a suitable route, but none with OPT_ALLOWROUTE set then | |
451 | we generate ICMP 'communication with destination network | |
452 | administratively prohibited'. */ | |
453 | ||
454 | best_quality=0; | |
455 | best_match=-1; | |
d3fe100d SE |
456 | for (i=0; i<st->n_clients; i++) { |
457 | if (st->routes[i]->up && | |
458 | ipset_contains_addr(st->routes[i]->networks,dest)) { | |
469fd1d9 SE |
459 | /* It's an available route to the correct destination. But is |
460 | it better than the one we already have? */ | |
461 | ||
462 | /* If we have already found an allowed route then we don't | |
463 | bother looking at routes we're not allowed to use. If | |
464 | we don't yet have an allowed route we'll consider any. */ | |
465 | if (!allow_route && found_allowed) { | |
d3fe100d | 466 | if (!(st->routes[i]->options&OPT_ALLOWROUTE)) continue; |
70dc107b | 467 | } |
469fd1d9 | 468 | |
d3fe100d | 469 | if (st->routes[i]->link_quality>best_quality |
469fd1d9 | 470 | || best_quality==0) { |
d3fe100d | 471 | best_quality=st->routes[i]->link_quality; |
469fd1d9 | 472 | best_match=i; |
d3fe100d | 473 | if (st->routes[i]->options&OPT_ALLOWROUTE) |
469fd1d9 SE |
474 | found_allowed=True; |
475 | /* If quality isn't perfect we may wish to | |
476 | consider kicking the tunnel with a 0-length | |
477 | packet to prompt it to perform a key setup. | |
478 | Then it'll eventually decide it's up or | |
479 | down. */ | |
480 | /* If quality is perfect and we're allowed to use the | |
481 | route we don't need to search any more. */ | |
482 | if (best_quality>=MAXIMUM_LINK_QUALITY && | |
483 | (allow_route || found_allowed)) break; | |
4efd681a | 484 | } |
70dc107b | 485 | } |
469fd1d9 SE |
486 | } |
487 | if (best_match==-1) { | |
488 | /* The packet's not going down a tunnel. It might (ought to) | |
489 | be for the host. */ | |
794f2398 | 490 | if (ipset_contains_addr(st->networks,dest)) { |
469fd1d9 SE |
491 | st->deliver_to_host(st->dst,buf); |
492 | st->outcount++; | |
70dc107b SE |
493 | BUF_ASSERT_FREE(buf); |
494 | } else { | |
469fd1d9 SE |
495 | string_t s,d; |
496 | s=ipaddr_to_string(source); | |
497 | d=ipaddr_to_string(dest); | |
ff05a229 | 498 | Message(M_DEBUG,"%s: don't know where to deliver packet " |
469fd1d9 SE |
499 | "(s=%s, d=%s)\n", st->name, s, d); |
500 | free(s); free(d); | |
ff05a229 SE |
501 | netlink_icmp_simple(st,buf,client,ICMP_TYPE_UNREACHABLE, |
502 | ICMP_CODE_NET_UNREACHABLE); | |
70dc107b | 503 | BUF_FREE(buf); |
2fe58dfd | 504 | } |
469fd1d9 SE |
505 | } else { |
506 | if (!allow_route && | |
d3fe100d | 507 | !(st->routes[best_match]->options&OPT_ALLOWROUTE)) { |
469fd1d9 SE |
508 | string_t s,d; |
509 | s=ipaddr_to_string(source); | |
510 | d=ipaddr_to_string(dest); | |
511 | /* We have a usable route but aren't allowed to use it. | |
512 | Generate ICMP destination unreachable: communication | |
513 | with destination network administratively prohibited */ | |
514 | Message(M_NOTICE,"%s: denied forwarding for packet (s=%s, d=%s)\n", | |
515 | st->name,s,d); | |
516 | free(s); free(d); | |
517 | ||
ff05a229 SE |
518 | netlink_icmp_simple(st,buf,client,ICMP_TYPE_UNREACHABLE, |
519 | ICMP_CODE_NET_PROHIBITED); | |
469fd1d9 | 520 | BUF_FREE(buf); |
469fd1d9 | 521 | } else { |
ea7ec970 SE |
522 | if (best_quality>0) { |
523 | /* XXX Fragment if required */ | |
524 | st->routes[best_match]->deliver( | |
525 | st->routes[best_match]->dst, buf); | |
526 | st->routes[best_match]->outcount++; | |
527 | BUF_ASSERT_FREE(buf); | |
528 | } else { | |
529 | /* Generate ICMP destination unreachable */ | |
530 | netlink_icmp_simple(st,buf,client,ICMP_TYPE_UNREACHABLE, | |
531 | ICMP_CODE_NET_UNREACHABLE); /* client==NULL */ | |
532 | BUF_FREE(buf); | |
533 | } | |
469fd1d9 | 534 | } |
2fe58dfd | 535 | } |
70dc107b | 536 | BUF_ASSERT_FREE(buf); |
4efd681a SE |
537 | } |
538 | ||
70dc107b SE |
539 | static void netlink_packet_forward(struct netlink *st, |
540 | struct netlink_client *client, | |
541 | struct buffer_if *buf) | |
4efd681a | 542 | { |
975820aa | 543 | if (buf->size < (int)sizeof(struct iphdr)) return; |
4efd681a SE |
544 | struct iphdr *iph=(struct iphdr *)buf->start; |
545 | ||
546 | BUF_ASSERT_USED(buf); | |
547 | ||
548 | /* Packet has already been checked */ | |
549 | if (iph->ttl<=1) { | |
550 | /* Generate ICMP time exceeded */ | |
ff05a229 SE |
551 | netlink_icmp_simple(st,buf,client,ICMP_TYPE_TIME_EXCEEDED, |
552 | ICMP_CODE_TTL_EXCEEDED); | |
4efd681a SE |
553 | BUF_FREE(buf); |
554 | return; | |
555 | } | |
556 | iph->ttl--; | |
557 | iph->check=0; | |
558 | iph->check=ip_fast_csum((uint8_t *)iph,iph->ihl); | |
559 | ||
70dc107b | 560 | netlink_packet_deliver(st,client,buf); |
4efd681a SE |
561 | BUF_ASSERT_FREE(buf); |
562 | } | |
563 | ||
9d3a4132 | 564 | /* Deal with packets addressed explicitly to us */ |
70dc107b SE |
565 | static void netlink_packet_local(struct netlink *st, |
566 | struct netlink_client *client, | |
567 | struct buffer_if *buf) | |
4efd681a SE |
568 | { |
569 | struct icmphdr *h; | |
570 | ||
469fd1d9 SE |
571 | st->localcount++; |
572 | ||
975820aa IJ |
573 | if (buf->size < (int)sizeof(struct icmphdr)) { |
574 | Message(M_WARNING,"%s: short packet addressed to secnet; " | |
575 | "ignoring it\n",st->name); | |
576 | BUF_FREE(buf); | |
577 | return; | |
578 | } | |
4efd681a SE |
579 | h=(struct icmphdr *)buf->start; |
580 | ||
581 | if ((ntohs(h->iph.frag_off)&0xbfff)!=0) { | |
9d3a4132 SE |
582 | Message(M_WARNING,"%s: fragmented packet addressed to secnet; " |
583 | "ignoring it\n",st->name); | |
4efd681a SE |
584 | BUF_FREE(buf); |
585 | return; | |
586 | } | |
587 | ||
588 | if (h->iph.protocol==1) { | |
589 | /* It's ICMP */ | |
ff05a229 | 590 | if (h->type==ICMP_TYPE_ECHO_REQUEST && h->code==0) { |
4efd681a SE |
591 | /* ICMP echo-request. Special case: we re-use the buffer |
592 | to construct the reply. */ | |
ff05a229 | 593 | h->type=ICMP_TYPE_ECHO_REPLY; |
4efd681a SE |
594 | h->iph.daddr=h->iph.saddr; |
595 | h->iph.saddr=htonl(st->secnet_address); | |
ff05a229 | 596 | h->iph.ttl=255; |
4efd681a SE |
597 | h->iph.check=0; |
598 | h->iph.check=ip_fast_csum((uint8_t *)h,h->iph.ihl); | |
599 | netlink_icmp_csum(h); | |
70dc107b | 600 | netlink_packet_deliver(st,NULL,buf); |
4efd681a SE |
601 | return; |
602 | } | |
603 | Message(M_WARNING,"%s: unknown incoming ICMP\n",st->name); | |
604 | } else { | |
605 | /* Send ICMP protocol unreachable */ | |
ff05a229 SE |
606 | netlink_icmp_simple(st,buf,client,ICMP_TYPE_UNREACHABLE, |
607 | ICMP_CODE_PROTOCOL_UNREACHABLE); | |
4efd681a SE |
608 | BUF_FREE(buf); |
609 | return; | |
610 | } | |
611 | ||
612 | BUF_FREE(buf); | |
613 | } | |
614 | ||
9d3a4132 SE |
615 | /* If cid==NULL packet is from host, otherwise cid specifies which tunnel |
616 | it came from. */ | |
469fd1d9 SE |
617 | static void netlink_incoming(struct netlink *st, struct netlink_client *client, |
618 | struct buffer_if *buf) | |
4efd681a | 619 | { |
4efd681a SE |
620 | uint32_t source,dest; |
621 | struct iphdr *iph; | |
d714da29 | 622 | char errmsgbuf[50]; |
a28d65a5 | 623 | const char *sourcedesc=client?client->name:"host"; |
4efd681a SE |
624 | |
625 | BUF_ASSERT_USED(buf); | |
a28d65a5 | 626 | |
d714da29 IJ |
627 | if (!netlink_check(st,buf,errmsgbuf,sizeof(errmsgbuf))) { |
628 | Message(M_WARNING,"%s: bad IP packet from %s: %s\n", | |
a28d65a5 | 629 | st->name,sourcedesc, |
d714da29 | 630 | errmsgbuf); |
4efd681a SE |
631 | BUF_FREE(buf); |
632 | return; | |
633 | } | |
975820aa | 634 | assert(buf->size >= (int)sizeof(struct icmphdr)); |
4efd681a SE |
635 | iph=(struct iphdr *)buf->start; |
636 | ||
637 | source=ntohl(iph->saddr); | |
638 | dest=ntohl(iph->daddr); | |
639 | ||
d3fe100d SE |
640 | /* Check source. If we don't like the source, there's no point |
641 | generating ICMP because we won't know how to get it to the | |
642 | source of the packet. */ | |
9d3a4132 | 643 | if (client) { |
c6f79b17 SE |
644 | /* Check that the packet source is appropriate for the tunnel |
645 | it came down */ | |
794f2398 | 646 | if (!ipset_contains_addr(client->networks,source)) { |
9d3a4132 SE |
647 | string_t s,d; |
648 | s=ipaddr_to_string(source); | |
649 | d=ipaddr_to_string(dest); | |
650 | Message(M_WARNING,"%s: packet from tunnel %s with bad " | |
651 | "source address (s=%s,d=%s)\n",st->name,client->name,s,d); | |
652 | free(s); free(d); | |
653 | BUF_FREE(buf); | |
654 | return; | |
655 | } | |
656 | } else { | |
c6f79b17 SE |
657 | /* Check that the packet originates in our configured local |
658 | network, and hasn't been forwarded from elsewhere or | |
659 | generated with the wrong source address */ | |
794f2398 | 660 | if (!ipset_contains_addr(st->networks,source)) { |
9d3a4132 SE |
661 | string_t s,d; |
662 | s=ipaddr_to_string(source); | |
663 | d=ipaddr_to_string(dest); | |
664 | Message(M_WARNING,"%s: outgoing packet with bad source address " | |
665 | "(s=%s,d=%s)\n",st->name,s,d); | |
666 | free(s); free(d); | |
667 | BUF_FREE(buf); | |
668 | return; | |
669 | } | |
4efd681a | 670 | } |
c6f79b17 | 671 | |
794f2398 SE |
672 | /* If this is a point-to-point device we don't examine the |
673 | destination address at all; we blindly send it down our | |
674 | one-and-only registered tunnel, or to the host, depending on | |
d3fe100d SE |
675 | where it came from. It's up to external software to check |
676 | address validity and generate ICMP, etc. */ | |
c6f79b17 SE |
677 | if (st->ptp) { |
678 | if (client) { | |
469fd1d9 | 679 | st->deliver_to_host(st->dst,buf); |
c6f79b17 | 680 | } else { |
469fd1d9 | 681 | st->clients->deliver(st->clients->dst,buf); |
c6f79b17 SE |
682 | } |
683 | BUF_ASSERT_FREE(buf); | |
684 | return; | |
685 | } | |
686 | ||
d3fe100d SE |
687 | /* st->secnet_address needs checking before matching destination |
688 | addresses */ | |
2fe58dfd | 689 | if (dest==st->secnet_address) { |
9d3a4132 | 690 | netlink_packet_local(st,client,buf); |
4efd681a | 691 | BUF_ASSERT_FREE(buf); |
2fe58dfd SE |
692 | return; |
693 | } | |
70dc107b | 694 | netlink_packet_forward(st,client,buf); |
4efd681a SE |
695 | BUF_ASSERT_FREE(buf); |
696 | } | |
697 | ||
469fd1d9 SE |
698 | static void netlink_inst_incoming(void *sst, struct buffer_if *buf) |
699 | { | |
700 | struct netlink_client *c=sst; | |
701 | struct netlink *st=c->nst; | |
702 | ||
703 | netlink_incoming(st,c,buf); | |
704 | } | |
705 | ||
706 | static void netlink_dev_incoming(void *sst, struct buffer_if *buf) | |
707 | { | |
708 | struct netlink *st=sst; | |
709 | ||
710 | netlink_incoming(st,NULL,buf); | |
711 | } | |
712 | ||
d3fe100d | 713 | static void netlink_set_quality(void *sst, uint32_t quality) |
4efd681a | 714 | { |
d3fe100d SE |
715 | struct netlink_client *c=sst; |
716 | struct netlink *st=c->nst; | |
4efd681a | 717 | |
d3fe100d SE |
718 | c->link_quality=quality; |
719 | c->up=(c->link_quality==LINK_QUALITY_DOWN)?False:True; | |
720 | if (c->options&OPT_SOFTROUTE) { | |
721 | st->set_routes(st->dst,c); | |
4efd681a | 722 | } |
4efd681a SE |
723 | } |
724 | ||
d3fe100d SE |
725 | static void netlink_output_subnets(struct netlink *st, uint32_t loglevel, |
726 | struct subnet_list *snets) | |
4efd681a | 727 | { |
1caa23ff | 728 | int32_t i; |
d3fe100d | 729 | string_t net; |
4efd681a | 730 | |
d3fe100d SE |
731 | for (i=0; i<snets->entries; i++) { |
732 | net=subnet_to_string(snets->list[i]); | |
733 | Message(loglevel,"%s ",net); | |
734 | free(net); | |
9d3a4132 | 735 | } |
4efd681a SE |
736 | } |
737 | ||
042a8da9 | 738 | static void netlink_dump_routes(struct netlink *st, bool_t requested) |
9d3a4132 SE |
739 | { |
740 | int i; | |
741 | string_t net; | |
042a8da9 | 742 | uint32_t c=M_INFO; |
9d3a4132 | 743 | |
042a8da9 | 744 | if (requested) c=M_WARNING; |
469fd1d9 SE |
745 | if (st->ptp) { |
746 | net=ipaddr_to_string(st->secnet_address); | |
747 | Message(c,"%s: point-to-point (remote end is %s); routes:\n", | |
748 | st->name, net); | |
9d3a4132 | 749 | free(net); |
d3fe100d | 750 | netlink_output_subnets(st,c,st->clients->subnets); |
469fd1d9 SE |
751 | Message(c,"\n"); |
752 | } else { | |
753 | Message(c,"%s: routing table:\n",st->name); | |
d3fe100d SE |
754 | for (i=0; i<st->n_clients; i++) { |
755 | netlink_output_subnets(st,c,st->routes[i]->subnets); | |
ff05a229 | 756 | Message(c,"-> tunnel %s (%s,mtu %d,%s routes,%s," |
ea7ec970 | 757 | "quality %d,use %d,pri %lu)\n", |
d3fe100d | 758 | st->routes[i]->name, |
ff05a229 SE |
759 | st->routes[i]->up?"up":"down", |
760 | st->routes[i]->mtu, | |
d3fe100d SE |
761 | st->routes[i]->options&OPT_SOFTROUTE?"soft":"hard", |
762 | st->routes[i]->options&OPT_ALLOWROUTE?"free":"restricted", | |
d3fe100d | 763 | st->routes[i]->link_quality, |
ea7ec970 SE |
764 | st->routes[i]->outcount, |
765 | (unsigned long)st->routes[i]->priority); | |
469fd1d9 SE |
766 | } |
767 | net=ipaddr_to_string(st->secnet_address); | |
768 | Message(c,"%s/32 -> netlink \"%s\" (use %d)\n", | |
769 | net,st->name,st->localcount); | |
9d3a4132 | 770 | free(net); |
794f2398 SE |
771 | for (i=0; i<st->subnets->entries; i++) { |
772 | net=subnet_to_string(st->subnets->list[i]); | |
773 | Message(c,"%s ",net); | |
469fd1d9 SE |
774 | free(net); |
775 | } | |
794f2398 SE |
776 | if (i>0) |
777 | Message(c,"-> host (use %d)\n",st->outcount); | |
9d3a4132 SE |
778 | } |
779 | } | |
780 | ||
d3fe100d SE |
781 | /* ap is a pointer to a member of the routes array */ |
782 | static int netlink_compare_client_priority(const void *ap, const void *bp) | |
70dc107b | 783 | { |
d3fe100d SE |
784 | const struct netlink_client *const*a=ap; |
785 | const struct netlink_client *const*b=bp; | |
70dc107b | 786 | |
d3fe100d SE |
787 | if ((*a)->priority==(*b)->priority) return 0; |
788 | if ((*a)->priority<(*b)->priority) return 1; | |
70dc107b SE |
789 | return -1; |
790 | } | |
791 | ||
792 | static void netlink_phase_hook(void *sst, uint32_t new_phase) | |
793 | { | |
794 | struct netlink *st=sst; | |
795 | struct netlink_client *c; | |
1caa23ff | 796 | int32_t i; |
70dc107b SE |
797 | |
798 | /* All the networks serviced by the various tunnels should now | |
799 | * have been registered. We build a routing table by sorting the | |
d3fe100d | 800 | * clients by priority. */ |
bb9d0561 IJ |
801 | st->routes=safe_malloc_ary(sizeof(*st->routes),st->n_clients, |
802 | "netlink_phase_hook"); | |
70dc107b SE |
803 | /* Fill the table */ |
804 | i=0; | |
59230b9b IJ |
805 | for (c=st->clients; c; c=c->next) { |
806 | assert(i<INT_MAX); | |
d3fe100d | 807 | st->routes[i++]=c; |
59230b9b | 808 | } |
d3fe100d SE |
809 | /* Sort the table in descending order of priority */ |
810 | qsort(st->routes,st->n_clients,sizeof(*st->routes), | |
811 | netlink_compare_client_priority); | |
9d3a4132 | 812 | |
042a8da9 SE |
813 | netlink_dump_routes(st,False); |
814 | } | |
815 | ||
816 | static void netlink_signal_handler(void *sst, int signum) | |
817 | { | |
818 | struct netlink *st=sst; | |
819 | Message(M_INFO,"%s: route dump requested by SIGUSR1\n",st->name); | |
820 | netlink_dump_routes(st,True); | |
70dc107b SE |
821 | } |
822 | ||
1caa23ff | 823 | static void netlink_inst_set_mtu(void *sst, int32_t new_mtu) |
d3fe100d SE |
824 | { |
825 | struct netlink_client *c=sst; | |
826 | ||
827 | c->mtu=new_mtu; | |
828 | } | |
829 | ||
469fd1d9 | 830 | static void netlink_inst_reg(void *sst, netlink_deliver_fn *deliver, |
3abd18e8 | 831 | void *dst) |
469fd1d9 SE |
832 | { |
833 | struct netlink_client *c=sst; | |
469fd1d9 | 834 | |
469fd1d9 SE |
835 | c->deliver=deliver; |
836 | c->dst=dst; | |
837 | } | |
838 | ||
839 | static struct flagstr netlink_option_table[]={ | |
840 | { "soft", OPT_SOFTROUTE }, | |
841 | { "allow-route", OPT_ALLOWROUTE }, | |
842 | { NULL, 0} | |
843 | }; | |
844 | /* This is the routine that gets called when the closure that's | |
845 | returned by an invocation of a netlink device closure (eg. tun, | |
846 | userv-ipif) is invoked. It's used to create routes and pass in | |
847 | information about them; the closure it returns is used by site | |
848 | code. */ | |
849 | static closure_t *netlink_inst_create(struct netlink *st, | |
850 | struct cloc loc, dict_t *dict) | |
851 | { | |
852 | struct netlink_client *c; | |
853 | string_t name; | |
794f2398 | 854 | struct ipset *networks; |
1caa23ff IJ |
855 | uint32_t options,priority; |
856 | int32_t mtu; | |
794f2398 | 857 | list_t *l; |
469fd1d9 SE |
858 | |
859 | name=dict_read_string(dict, "name", True, st->name, loc); | |
860 | ||
794f2398 SE |
861 | l=dict_lookup(dict,"routes"); |
862 | if (!l) | |
863 | cfgfatal(loc,st->name,"required parameter \"routes\" not found\n"); | |
864 | networks=string_list_to_ipset(l,loc,st->name,"routes"); | |
469fd1d9 SE |
865 | options=string_list_to_word(dict_lookup(dict,"options"), |
866 | netlink_option_table,st->name); | |
867 | ||
d3fe100d SE |
868 | priority=dict_read_number(dict,"priority",False,st->name,loc,0); |
869 | mtu=dict_read_number(dict,"mtu",False,st->name,loc,0); | |
870 | ||
871 | if ((options&OPT_SOFTROUTE) && !st->set_routes) { | |
469fd1d9 SE |
872 | cfgfatal(loc,st->name,"this netlink device does not support " |
873 | "soft routes.\n"); | |
874 | return NULL; | |
875 | } | |
876 | ||
877 | if (options&OPT_SOFTROUTE) { | |
878 | /* XXX for now we assume that soft routes require root privilege; | |
879 | this may not always be true. The device driver can tell us. */ | |
880 | require_root_privileges=True; | |
881 | require_root_privileges_explanation="netlink: soft routes"; | |
882 | if (st->ptp) { | |
883 | cfgfatal(loc,st->name,"point-to-point netlinks do not support " | |
884 | "soft routes.\n"); | |
885 | return NULL; | |
886 | } | |
887 | } | |
888 | ||
794f2398 SE |
889 | /* Check that nets are a subset of st->remote_networks; |
890 | refuse to register if they are not. */ | |
891 | if (!ipset_is_subset(st->remote_networks,networks)) { | |
892 | cfgfatal(loc,st->name,"routes are not allowed\n"); | |
469fd1d9 SE |
893 | return NULL; |
894 | } | |
895 | ||
896 | c=safe_malloc(sizeof(*c),"netlink_inst_create"); | |
897 | c->cl.description=name; | |
898 | c->cl.type=CL_NETLINK; | |
899 | c->cl.apply=NULL; | |
900 | c->cl.interface=&c->ops; | |
901 | c->ops.st=c; | |
902 | c->ops.reg=netlink_inst_reg; | |
903 | c->ops.deliver=netlink_inst_incoming; | |
904 | c->ops.set_quality=netlink_set_quality; | |
d3fe100d | 905 | c->ops.set_mtu=netlink_inst_set_mtu; |
469fd1d9 SE |
906 | c->nst=st; |
907 | ||
908 | c->networks=networks; | |
794f2398 | 909 | c->subnets=ipset_to_subnet_list(networks); |
d3fe100d | 910 | c->priority=priority; |
469fd1d9 SE |
911 | c->deliver=NULL; |
912 | c->dst=NULL; | |
913 | c->name=name; | |
f208b9a9 | 914 | c->link_quality=LINK_QUALITY_UNUSED; |
d3fe100d SE |
915 | c->mtu=mtu?mtu:st->mtu; |
916 | c->options=options; | |
917 | c->outcount=0; | |
918 | c->up=False; | |
919 | c->kup=False; | |
469fd1d9 SE |
920 | c->next=st->clients; |
921 | st->clients=c; | |
59230b9b | 922 | assert(st->n_clients < INT_MAX); |
d3fe100d | 923 | st->n_clients++; |
469fd1d9 SE |
924 | |
925 | return &c->cl; | |
926 | } | |
927 | ||
928 | static list_t *netlink_inst_apply(closure_t *self, struct cloc loc, | |
929 | dict_t *context, list_t *args) | |
930 | { | |
931 | struct netlink *st=self->interface; | |
932 | ||
933 | dict_t *dict; | |
934 | item_t *item; | |
935 | closure_t *cl; | |
936 | ||
469fd1d9 SE |
937 | item=list_elem(args,0); |
938 | if (!item || item->type!=t_dict) { | |
939 | cfgfatal(loc,st->name,"must have a dictionary argument\n"); | |
940 | } | |
941 | dict=item->data.dict; | |
942 | ||
943 | cl=netlink_inst_create(st,loc,dict); | |
944 | ||
945 | return new_closure(cl); | |
946 | } | |
947 | ||
9d3a4132 SE |
948 | netlink_deliver_fn *netlink_init(struct netlink *st, |
949 | void *dst, struct cloc loc, | |
fe5e9cc4 | 950 | dict_t *dict, cstring_t description, |
d3fe100d | 951 | netlink_route_fn *set_routes, |
9d3a4132 | 952 | netlink_deliver_fn *to_host) |
4efd681a | 953 | { |
c6f79b17 | 954 | item_t *sa, *ptpa; |
794f2398 | 955 | list_t *l; |
c6f79b17 | 956 | |
4efd681a SE |
957 | st->dst=dst; |
958 | st->cl.description=description; | |
469fd1d9 SE |
959 | st->cl.type=CL_PURE; |
960 | st->cl.apply=netlink_inst_apply; | |
961 | st->cl.interface=st; | |
4efd681a | 962 | st->clients=NULL; |
d3fe100d SE |
963 | st->routes=NULL; |
964 | st->n_clients=0; | |
965 | st->set_routes=set_routes; | |
4efd681a SE |
966 | st->deliver_to_host=to_host; |
967 | ||
794f2398 | 968 | st->name=dict_read_string(dict,"name",False,description,loc); |
4efd681a | 969 | if (!st->name) st->name=description; |
794f2398 SE |
970 | l=dict_lookup(dict,"networks"); |
971 | if (l) | |
972 | st->networks=string_list_to_ipset(l,loc,st->name,"networks"); | |
973 | else { | |
4f5e39ec SE |
974 | struct ipset *empty; |
975 | empty=ipset_new(); | |
976 | st->networks=ipset_complement(empty); | |
977 | ipset_free(empty); | |
794f2398 SE |
978 | } |
979 | l=dict_lookup(dict,"remote-networks"); | |
980 | if (l) { | |
981 | st->remote_networks=string_list_to_ipset(l,loc,st->name, | |
982 | "remote-networks"); | |
983 | } else { | |
984 | struct ipset *empty; | |
985 | empty=ipset_new(); | |
986 | st->remote_networks=ipset_complement(empty); | |
987 | ipset_free(empty); | |
988 | } | |
989 | ||
c6f79b17 | 990 | sa=dict_find_item(dict,"secnet-address",False,"netlink",loc); |
469fd1d9 | 991 | ptpa=dict_find_item(dict,"ptp-address",False,"netlink",loc); |
c6f79b17 SE |
992 | if (sa && ptpa) { |
993 | cfgfatal(loc,st->name,"you may not specify secnet-address and " | |
994 | "ptp-address in the same netlink device\n"); | |
995 | } | |
996 | if (!(sa || ptpa)) { | |
997 | cfgfatal(loc,st->name,"you must specify secnet-address or " | |
998 | "ptp-address for this netlink device\n"); | |
999 | } | |
1000 | if (sa) { | |
794f2398 | 1001 | st->secnet_address=string_item_to_ipaddr(sa,"netlink"); |
c6f79b17 SE |
1002 | st->ptp=False; |
1003 | } else { | |
794f2398 | 1004 | st->secnet_address=string_item_to_ipaddr(ptpa,"netlink"); |
c6f79b17 SE |
1005 | st->ptp=True; |
1006 | } | |
d3fe100d SE |
1007 | /* To be strictly correct we could subtract secnet_address from |
1008 | networks here. It shouldn't make any practical difference, | |
794f2398 SE |
1009 | though, and will make the route dump look complicated... */ |
1010 | st->subnets=ipset_to_subnet_list(st->networks); | |
4efd681a SE |
1011 | st->mtu=dict_read_number(dict, "mtu", False, "netlink", loc, DEFAULT_MTU); |
1012 | buffer_new(&st->icmp,ICMP_BUFSIZE); | |
469fd1d9 SE |
1013 | st->outcount=0; |
1014 | st->localcount=0; | |
70dc107b SE |
1015 | |
1016 | add_hook(PHASE_SETUP,netlink_phase_hook,st); | |
042a8da9 | 1017 | request_signal_notification(SIGUSR1, netlink_signal_handler, st); |
4efd681a | 1018 | |
469fd1d9 SE |
1019 | /* If we're point-to-point then we return a CL_NETLINK directly, |
1020 | rather than a CL_NETLINK_OLD or pure closure (depending on | |
1021 | compatibility). This CL_NETLINK is for our one and only | |
1022 | client. Our cl.apply function is NULL. */ | |
1023 | if (st->ptp) { | |
1024 | closure_t *cl; | |
1025 | cl=netlink_inst_create(st,loc,dict); | |
1026 | st->cl=*cl; | |
1027 | } | |
1028 | return netlink_dev_incoming; | |
2fe58dfd SE |
1029 | } |
1030 | ||
9d3a4132 | 1031 | /* No connection to the kernel at all... */ |
2fe58dfd | 1032 | |
9d3a4132 | 1033 | struct null { |
4efd681a | 1034 | struct netlink nl; |
4efd681a | 1035 | }; |
2fe58dfd | 1036 | |
d3fe100d | 1037 | static bool_t null_set_route(void *sst, struct netlink_client *routes) |
4efd681a | 1038 | { |
9d3a4132 | 1039 | struct null *st=sst; |
d3fe100d SE |
1040 | |
1041 | if (routes->up!=routes->kup) { | |
1042 | Message(M_INFO,"%s: setting routes for tunnel %s to state %s\n", | |
1043 | st->nl.name,routes->name, | |
1044 | routes->up?"up":"down"); | |
1045 | routes->kup=routes->up; | |
9d3a4132 | 1046 | return True; |
2fe58dfd | 1047 | } |
9d3a4132 | 1048 | return False; |
2fe58dfd | 1049 | } |
9d3a4132 | 1050 | |
469fd1d9 | 1051 | static void null_deliver(void *sst, struct buffer_if *buf) |
2fe58dfd SE |
1052 | { |
1053 | return; | |
1054 | } | |
1055 | ||
1056 | static list_t *null_apply(closure_t *self, struct cloc loc, dict_t *context, | |
1057 | list_t *args) | |
1058 | { | |
1059 | struct null *st; | |
4efd681a SE |
1060 | item_t *item; |
1061 | dict_t *dict; | |
2fe58dfd | 1062 | |
4efd681a | 1063 | st=safe_malloc(sizeof(*st),"null_apply"); |
2fe58dfd | 1064 | |
4efd681a SE |
1065 | item=list_elem(args,0); |
1066 | if (!item || item->type!=t_dict) | |
1067 | cfgfatal(loc,"null-netlink","parameter must be a dictionary\n"); | |
1068 | ||
1069 | dict=item->data.dict; | |
1070 | ||
9d3a4132 SE |
1071 | netlink_init(&st->nl,st,loc,dict,"null-netlink",null_set_route, |
1072 | null_deliver); | |
4efd681a SE |
1073 | |
1074 | return new_closure(&st->nl.cl); | |
2fe58dfd SE |
1075 | } |
1076 | ||
2fe58dfd SE |
1077 | void netlink_module(dict_t *dict) |
1078 | { | |
4efd681a | 1079 | add_closure(dict,"null-netlink",null_apply); |
2fe58dfd | 1080 | } |