| 1 | /* User-kernel network link */ |
| 2 | |
| 3 | /* We will eventually support a variety of methods for extracting |
| 4 | packets from the kernel: userv-ipif, ipif on its own (when we run |
| 5 | as root), the kernel TUN driver, SLIP to a pty, an external netlink |
| 6 | daemon. There is a performance/security tradeoff. */ |
| 7 | |
| 8 | /* When dealing with SLIP (to a pty, or ipif) we have separate rx, tx |
| 9 | and client buffers. When receiving we may read() any amount, not |
| 10 | just whole packets. When transmitting we need to bytestuff anyway, |
| 11 | and may be part-way through receiving. */ |
| 12 | |
| 13 | /* Each netlink device is actually a router, with its own IP |
| 14 | address. We do things like decreasing the TTL and recalculating the |
| 15 | header checksum, generating ICMP, responding to pings, etc. */ |
| 16 | |
| 17 | /* This is where we have the anti-spoofing paranoia - before sending a |
| 18 | packet to the kernel we check that the tunnel it came over could |
| 19 | reasonably have produced it. */ |
| 20 | |
| 21 | /* XXX now implement TUN. Kernel needs recompiling. */ |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include <string.h> |
| 25 | #include <unistd.h> |
| 26 | #include <fcntl.h> |
| 27 | #include <sys/ioctl.h> |
| 28 | |
| 29 | #include "config.h" |
| 30 | #include "secnet.h" |
| 31 | #include "util.h" |
| 32 | |
| 33 | #ifdef HAVE_LINUX_IF_H |
| 34 | #include <linux/if.h> |
| 35 | #include <linux/if_tun.h> |
| 36 | #endif |
| 37 | |
| 38 | /* XXX where do we find if_tun on other architectures? */ |
| 39 | |
| 40 | #define DEFAULT_BUFSIZE 2048 |
| 41 | #define DEFAULT_MTU 1000 |
| 42 | #define ICMP_BUFSIZE 1024 |
| 43 | |
| 44 | #define SLIP_END 192 |
| 45 | #define SLIP_ESC 219 |
| 46 | #define SLIP_ESCEND 220 |
| 47 | #define SLIP_ESCESC 221 |
| 48 | |
| 49 | struct netlink_client { |
| 50 | struct subnet_list *networks; |
| 51 | netlink_deliver_fn *deliver; |
| 52 | void *dst; |
| 53 | string_t name; |
| 54 | bool_t can_deliver; |
| 55 | struct netlink_client *next; |
| 56 | }; |
| 57 | |
| 58 | /* Netlink provides one function to the device driver, to call to deliver |
| 59 | a packet from the device. The device driver provides one function to |
| 60 | netlink, for it to call to deliver a packet to the device. */ |
| 61 | |
| 62 | struct netlink { |
| 63 | closure_t cl; |
| 64 | struct netlink_if ops; |
| 65 | void *dst; /* Pointer to host interface state */ |
| 66 | string_t name; |
| 67 | uint32_t max_start_pad; |
| 68 | uint32_t max_end_pad; |
| 69 | struct subnet_list networks; |
| 70 | uint32_t local_address; /* host interface address */ |
| 71 | uint32_t secnet_address; /* our own address */ |
| 72 | uint32_t mtu; |
| 73 | struct netlink_client *clients; |
| 74 | netlink_deliver_fn *deliver_to_host; /* Provided by driver */ |
| 75 | struct buffer_if icmp; /* Buffer for assembly of outgoing ICMP */ |
| 76 | }; |
| 77 | |
| 78 | /* Generic IP checksum routine */ |
| 79 | static inline uint16_t ip_csum(uint8_t *iph,uint32_t count) |
| 80 | { |
| 81 | register uint32_t sum=0; |
| 82 | |
| 83 | while (count>1) { |
| 84 | sum+=ntohs(*(uint16_t *)iph); |
| 85 | iph+=2; |
| 86 | count-=2; |
| 87 | } |
| 88 | if(count>0) |
| 89 | sum+=*(uint8_t *)iph; |
| 90 | while (sum>>16) |
| 91 | sum=(sum&0xffff)+(sum>>16); |
| 92 | return htons(~sum); |
| 93 | } |
| 94 | |
| 95 | #ifdef i386 |
| 96 | /* |
| 97 | * This is a version of ip_compute_csum() optimized for IP headers, |
| 98 | * which always checksum on 4 octet boundaries. |
| 99 | * |
| 100 | * By Jorge Cwik <jorge@laser.satlink.net>, adapted for linux by |
| 101 | * Arnt Gulbrandsen. |
| 102 | */ |
| 103 | static inline uint16_t ip_fast_csum(uint8_t *iph, uint32_t ihl) { |
| 104 | uint32_t sum; |
| 105 | |
| 106 | __asm__ __volatile__(" |
| 107 | movl (%1), %0 |
| 108 | subl $4, %2 |
| 109 | jbe 2f |
| 110 | addl 4(%1), %0 |
| 111 | adcl 8(%1), %0 |
| 112 | adcl 12(%1), %0 |
| 113 | 1: adcl 16(%1), %0 |
| 114 | lea 4(%1), %1 |
| 115 | decl %2 |
| 116 | jne 1b |
| 117 | adcl $0, %0 |
| 118 | movl %0, %2 |
| 119 | shrl $16, %0 |
| 120 | addw %w2, %w0 |
| 121 | adcl $0, %0 |
| 122 | notl %0 |
| 123 | 2: |
| 124 | " |
| 125 | /* Since the input registers which are loaded with iph and ipl |
| 126 | are modified, we must also specify them as outputs, or gcc |
| 127 | will assume they contain their original values. */ |
| 128 | : "=r" (sum), "=r" (iph), "=r" (ihl) |
| 129 | : "1" (iph), "2" (ihl)); |
| 130 | return sum; |
| 131 | } |
| 132 | #else |
| 133 | static inline uint16_t ip_fast_csum(uint8_t *iph, uint32_t ihl) |
| 134 | { |
| 135 | return ip_csum(iph,ihl*4); |
| 136 | } |
| 137 | #endif |
| 138 | |
| 139 | struct iphdr { |
| 140 | #if defined (WORDS_BIGENDIAN) |
| 141 | uint8_t version:4, |
| 142 | ihl:4; |
| 143 | #else |
| 144 | uint8_t ihl:4, |
| 145 | version:4; |
| 146 | #endif |
| 147 | uint8_t tos; |
| 148 | uint16_t tot_len; |
| 149 | uint16_t id; |
| 150 | uint16_t frag_off; |
| 151 | uint8_t ttl; |
| 152 | uint8_t protocol; |
| 153 | uint16_t check; |
| 154 | uint32_t saddr; |
| 155 | uint32_t daddr; |
| 156 | /* The options start here. */ |
| 157 | }; |
| 158 | |
| 159 | struct icmphdr { |
| 160 | struct iphdr iph; |
| 161 | uint8_t type; |
| 162 | uint8_t code; |
| 163 | uint16_t check; |
| 164 | union { |
| 165 | uint32_t unused; |
| 166 | struct { |
| 167 | uint8_t pointer; |
| 168 | uint8_t unused1; |
| 169 | uint16_t unused2; |
| 170 | } pprob; |
| 171 | uint32_t gwaddr; |
| 172 | struct { |
| 173 | uint16_t id; |
| 174 | uint16_t seq; |
| 175 | } echo; |
| 176 | } d; |
| 177 | }; |
| 178 | |
| 179 | static void netlink_packet_deliver(struct netlink *st, struct buffer_if *buf); |
| 180 | |
| 181 | static struct icmphdr *netlink_icmp_tmpl(struct netlink *st, |
| 182 | uint32_t dest,uint16_t len) |
| 183 | { |
| 184 | struct icmphdr *h; |
| 185 | |
| 186 | BUF_ALLOC(&st->icmp,"netlink_icmp_tmpl"); |
| 187 | buffer_init(&st->icmp,st->max_start_pad); |
| 188 | h=buf_append(&st->icmp,sizeof(*h)); |
| 189 | |
| 190 | h->iph.version=4; |
| 191 | h->iph.ihl=5; |
| 192 | h->iph.tos=0; |
| 193 | h->iph.tot_len=htons(len+(h->iph.ihl*4)+8); |
| 194 | h->iph.id=0; |
| 195 | h->iph.frag_off=0; |
| 196 | h->iph.ttl=255; |
| 197 | h->iph.protocol=1; |
| 198 | h->iph.saddr=htonl(st->secnet_address); |
| 199 | h->iph.daddr=htonl(dest); |
| 200 | h->iph.check=0; |
| 201 | h->iph.check=ip_fast_csum((uint8_t *)&h->iph,h->iph.ihl); |
| 202 | h->check=0; |
| 203 | h->d.unused=0; |
| 204 | |
| 205 | return h; |
| 206 | } |
| 207 | |
| 208 | /* Fill in the ICMP checksum field correctly */ |
| 209 | static void netlink_icmp_csum(struct icmphdr *h) |
| 210 | { |
| 211 | uint32_t len; |
| 212 | |
| 213 | len=ntohs(h->iph.tot_len)-(4*h->iph.ihl); |
| 214 | h->check=0; |
| 215 | h->check=ip_csum(&h->type,len); |
| 216 | } |
| 217 | |
| 218 | /* RFC1122: |
| 219 | * An ICMP error message MUST NOT be sent as the result of |
| 220 | * receiving: |
| 221 | * |
| 222 | * * an ICMP error message, or |
| 223 | * |
| 224 | * * a datagram destined to an IP broadcast or IP multicast |
| 225 | * address, or |
| 226 | * |
| 227 | * * a datagram sent as a link-layer broadcast, or |
| 228 | * |
| 229 | * * a non-initial fragment, or |
| 230 | * |
| 231 | * * a datagram whose source address does not define a single |
| 232 | * host -- e.g., a zero address, a loopback address, a |
| 233 | * broadcast address, a multicast address, or a Class E |
| 234 | * address. |
| 235 | */ |
| 236 | static bool_t netlink_icmp_may_reply(struct buffer_if *buf) |
| 237 | { |
| 238 | struct iphdr *iph; |
| 239 | uint32_t source; |
| 240 | |
| 241 | iph=(struct iphdr *)buf->start; |
| 242 | if (iph->protocol==1) return False; /* Overly-broad; we may reply to |
| 243 | eg. icmp echo-request */ |
| 244 | /* How do we spot broadcast destination addresses? */ |
| 245 | if (ntohs(iph->frag_off)&0x1fff) return False; /* Non-initial fragment */ |
| 246 | source=ntohl(iph->saddr); |
| 247 | if (source==0) return False; |
| 248 | if ((source&0xff000000)==0x7f000000) return False; |
| 249 | /* How do we spot broadcast source addresses? */ |
| 250 | if ((source&0xf0000000)==0xe0000000) return False; /* Multicast */ |
| 251 | if ((source&0xf0000000)==0xf0000000) return False; /* Class E */ |
| 252 | return True; |
| 253 | } |
| 254 | |
| 255 | /* How much of the original IP packet do we include in its ICMP |
| 256 | response? The header plus up to 64 bits. */ |
| 257 | static uint16_t netlink_icmp_reply_len(struct buffer_if *buf) |
| 258 | { |
| 259 | struct iphdr *iph=(struct iphdr *)buf->start; |
| 260 | uint16_t hlen,plen; |
| 261 | |
| 262 | hlen=iph->ihl*4; |
| 263 | /* We include the first 8 bytes of the packet data, provided they exist */ |
| 264 | hlen+=8; |
| 265 | plen=ntohs(iph->tot_len); |
| 266 | return (hlen>plen?plen:hlen); |
| 267 | } |
| 268 | |
| 269 | static void netlink_icmp_simple(struct netlink *st, struct buffer_if *buf, |
| 270 | uint8_t type, uint8_t code) |
| 271 | { |
| 272 | struct iphdr *iph=(struct iphdr *)buf->start; |
| 273 | struct icmphdr *h; |
| 274 | uint16_t len; |
| 275 | |
| 276 | if (netlink_icmp_may_reply(buf)) { |
| 277 | len=netlink_icmp_reply_len(buf); |
| 278 | h=netlink_icmp_tmpl(st,ntohl(iph->saddr),len); |
| 279 | h->type=type; h->code=code; |
| 280 | memcpy(buf_append(&st->icmp,len),buf->start,len); |
| 281 | netlink_icmp_csum(h); |
| 282 | netlink_packet_deliver(st,&st->icmp); |
| 283 | BUF_ASSERT_FREE(&st->icmp); |
| 284 | } |
| 285 | } |
| 286 | |
| 287 | /* |
| 288 | * RFC1122: 3.1.2.2 MUST silently discard any IP frame that fails the |
| 289 | * checksum. |
| 290 | * |
| 291 | * Is the datagram acceptable? |
| 292 | * |
| 293 | * 1. Length at least the size of an ip header |
| 294 | * 2. Version of 4 |
| 295 | * 3. Checksums correctly. |
| 296 | * 4. Doesn't have a bogus length |
| 297 | */ |
| 298 | static bool_t netlink_check(struct netlink *st, struct buffer_if *buf) |
| 299 | { |
| 300 | struct iphdr *iph=(struct iphdr *)buf->start; |
| 301 | uint32_t len; |
| 302 | |
| 303 | if (iph->ihl < 5 || iph->version != 4) { |
| 304 | printf("ihl/version check failed\n"); |
| 305 | return False; |
| 306 | } |
| 307 | if (buf->size < iph->ihl*4) { |
| 308 | printf("buffer size check failed\n"); |
| 309 | return False; |
| 310 | } |
| 311 | if (ip_fast_csum((uint8_t *)iph, iph->ihl)!=0) { |
| 312 | printf("checksum failed\n"); |
| 313 | return False; |
| 314 | } |
| 315 | len=ntohs(iph->tot_len); |
| 316 | /* There should be no padding */ |
| 317 | if (buf->size!=len || len<(iph->ihl<<2)) { |
| 318 | printf("length check failed buf->size=%d len=%d\n",buf->size,len); |
| 319 | return False; |
| 320 | } |
| 321 | |
| 322 | /* XXX check that there's no source route specified */ |
| 323 | return True; |
| 324 | } |
| 325 | |
| 326 | static void netlink_packet_deliver(struct netlink *st, struct buffer_if *buf) |
| 327 | { |
| 328 | struct iphdr *iph=(struct iphdr *)buf->start; |
| 329 | uint32_t dest=ntohl(iph->daddr); |
| 330 | struct netlink_client *c; |
| 331 | |
| 332 | BUF_ASSERT_USED(buf); |
| 333 | |
| 334 | if (dest==st->secnet_address) { |
| 335 | Message(M_ERROR,"%s: trying to deliver a packet to myself!\n"); |
| 336 | BUF_FREE(buf); |
| 337 | return; |
| 338 | } |
| 339 | |
| 340 | for (c=st->clients; c; c=c->next) { |
| 341 | if (subnet_match(c->networks,dest)) { |
| 342 | if (c->can_deliver) { |
| 343 | c->deliver(c->dst,c,buf); |
| 344 | BUF_ASSERT_FREE(buf); |
| 345 | } else { |
| 346 | /* Generate ICMP destination unreachable */ |
| 347 | netlink_icmp_simple(st,buf,3,0); |
| 348 | BUF_FREE(buf); |
| 349 | } |
| 350 | return; |
| 351 | } |
| 352 | } |
| 353 | if (subnet_match(&st->networks,dest)) { |
| 354 | st->deliver_to_host(st->dst,NULL,buf); |
| 355 | BUF_ASSERT_FREE(buf); |
| 356 | return; |
| 357 | } |
| 358 | Message(M_ERROR,"%s: failed to deliver a packet (bad destination address)" |
| 359 | "\nXXX make this message clearer\n"); |
| 360 | BUF_FREE(buf); |
| 361 | } |
| 362 | |
| 363 | static void netlink_packet_forward(struct netlink *st, struct buffer_if *buf) |
| 364 | { |
| 365 | struct iphdr *iph=(struct iphdr *)buf->start; |
| 366 | |
| 367 | BUF_ASSERT_USED(buf); |
| 368 | |
| 369 | /* Packet has already been checked */ |
| 370 | if (iph->ttl<=1) { |
| 371 | /* Generate ICMP time exceeded */ |
| 372 | netlink_icmp_simple(st,buf,11,0); |
| 373 | BUF_FREE(buf); |
| 374 | return; |
| 375 | } |
| 376 | iph->ttl--; |
| 377 | iph->check=0; |
| 378 | iph->check=ip_fast_csum((uint8_t *)iph,iph->ihl); |
| 379 | |
| 380 | netlink_packet_deliver(st,buf); |
| 381 | BUF_ASSERT_FREE(buf); |
| 382 | } |
| 383 | |
| 384 | /* Someone has been foolish enough to address a packet to us. I |
| 385 | suppose we should reply to it, just to be polite. */ |
| 386 | static void netlink_packet_local(struct netlink *st, struct buffer_if *buf) |
| 387 | { |
| 388 | struct icmphdr *h; |
| 389 | |
| 390 | h=(struct icmphdr *)buf->start; |
| 391 | |
| 392 | if ((ntohs(h->iph.frag_off)&0xbfff)!=0) { |
| 393 | Message(M_WARNING,"%s: fragmented packet addressed to us\n",st->name); |
| 394 | BUF_FREE(buf); |
| 395 | return; |
| 396 | } |
| 397 | |
| 398 | if (h->iph.protocol==1) { |
| 399 | /* It's ICMP */ |
| 400 | if (h->type==8 && h->code==0) { |
| 401 | /* ICMP echo-request. Special case: we re-use the buffer |
| 402 | to construct the reply. */ |
| 403 | h->type=0; |
| 404 | h->iph.daddr=h->iph.saddr; |
| 405 | h->iph.saddr=htonl(st->secnet_address); |
| 406 | h->iph.ttl=255; /* Be nice and bump it up again... */ |
| 407 | h->iph.check=0; |
| 408 | h->iph.check=ip_fast_csum((uint8_t *)h,h->iph.ihl); |
| 409 | netlink_icmp_csum(h); |
| 410 | netlink_packet_deliver(st,buf); |
| 411 | return; |
| 412 | } |
| 413 | Message(M_WARNING,"%s: unknown incoming ICMP\n",st->name); |
| 414 | } else { |
| 415 | /* Send ICMP protocol unreachable */ |
| 416 | netlink_icmp_simple(st,buf,3,2); |
| 417 | BUF_FREE(buf); |
| 418 | return; |
| 419 | } |
| 420 | |
| 421 | BUF_FREE(buf); |
| 422 | } |
| 423 | |
| 424 | /* Called by site code when remote packet is available */ |
| 425 | /* buf is allocated on entry and free on return */ |
| 426 | static void netlink_from_tunnel(void *sst, void *cst, struct buffer_if *buf) |
| 427 | { |
| 428 | struct netlink *st=sst; |
| 429 | struct netlink_client *client=cst; |
| 430 | uint32_t source,dest; |
| 431 | struct iphdr *iph; |
| 432 | |
| 433 | BUF_ASSERT_USED(buf); |
| 434 | if (!netlink_check(st,buf)) { |
| 435 | Message(M_WARNING,"%s: bad IP packet from tunnel %s\n", |
| 436 | st->name,client->name); |
| 437 | BUF_FREE(buf); |
| 438 | return; |
| 439 | } |
| 440 | iph=(struct iphdr *)buf->start; |
| 441 | |
| 442 | source=ntohl(iph->saddr); |
| 443 | dest=ntohl(iph->daddr); |
| 444 | |
| 445 | /* Check that the packet source is in 'nets' and its destination is |
| 446 | in client->networks */ |
| 447 | if (!subnet_match(client->networks,source)) { |
| 448 | string_t s,d; |
| 449 | s=ipaddr_to_string(source); |
| 450 | d=ipaddr_to_string(dest); |
| 451 | Message(M_WARNING,"%s: packet from tunnel %s with bad source address " |
| 452 | "(s=%s,d=%s)\n",st->name,client->name,s,d); |
| 453 | free(s); free(d); |
| 454 | BUF_FREE(buf); |
| 455 | return; |
| 456 | } |
| 457 | /* (st->secnet_address needs checking before matching against |
| 458 | st->networks because secnet's IP address may not be in the |
| 459 | range the host is willing to deal with) */ |
| 460 | if (dest==st->secnet_address) { |
| 461 | netlink_packet_local(st,buf); |
| 462 | BUF_ASSERT_FREE(buf); |
| 463 | return; |
| 464 | } |
| 465 | if (!subnet_match(&st->networks,dest)) { |
| 466 | string_t s,d; |
| 467 | s=ipaddr_to_string(source); |
| 468 | d=ipaddr_to_string(dest); |
| 469 | Message(M_WARNING,"%s: incoming packet from tunnel %s " |
| 470 | "with bad destination address " |
| 471 | "(s=%s,d=%s)\n",st->name,client->name,s,d); |
| 472 | free(s); free(d); |
| 473 | BUF_FREE(buf); |
| 474 | return; |
| 475 | } |
| 476 | |
| 477 | netlink_packet_forward(st,buf); |
| 478 | |
| 479 | BUF_ASSERT_FREE(buf); |
| 480 | } |
| 481 | |
| 482 | /* Called by driver code when packet is received from kernel */ |
| 483 | /* cid should be NULL */ |
| 484 | /* buf should be allocated on entry, and is free on return */ |
| 485 | static void netlink_from_host(void *sst, void *cid, struct buffer_if *buf) |
| 486 | { |
| 487 | struct netlink *st=sst; |
| 488 | uint32_t source,dest; |
| 489 | struct iphdr *iph; |
| 490 | |
| 491 | BUF_ASSERT_USED(buf); |
| 492 | if (!netlink_check(st,buf)) { |
| 493 | Message(M_WARNING,"%s: bad IP packet from host\n", |
| 494 | st->name); |
| 495 | BUF_FREE(buf); |
| 496 | return; |
| 497 | } |
| 498 | iph=(struct iphdr *)buf->start; |
| 499 | |
| 500 | source=ntohl(iph->saddr); |
| 501 | dest=ntohl(iph->daddr); |
| 502 | |
| 503 | if (!subnet_match(&st->networks,source)) { |
| 504 | string_t s,d; |
| 505 | s=ipaddr_to_string(source); |
| 506 | d=ipaddr_to_string(dest); |
| 507 | Message(M_WARNING,"%s: outgoing packet with bad source address " |
| 508 | "(s=%s,d=%s)\n",st->name,s,d); |
| 509 | free(s); free(d); |
| 510 | BUF_FREE(buf); |
| 511 | return; |
| 512 | } |
| 513 | if (dest==st->secnet_address) { |
| 514 | netlink_packet_local(st,buf); |
| 515 | BUF_ASSERT_FREE(buf); |
| 516 | return; |
| 517 | } |
| 518 | netlink_packet_forward(st,buf); |
| 519 | BUF_ASSERT_FREE(buf); |
| 520 | } |
| 521 | |
| 522 | static void netlink_set_delivery(void *sst, void *cid, bool_t can_deliver) |
| 523 | { |
| 524 | struct netlink_client *c=cid; |
| 525 | |
| 526 | c->can_deliver=can_deliver; |
| 527 | } |
| 528 | |
| 529 | static void *netlink_regnets(void *sst, struct subnet_list *nets, |
| 530 | netlink_deliver_fn *deliver, void *dst, |
| 531 | uint32_t max_start_pad, uint32_t max_end_pad, |
| 532 | string_t client_name) |
| 533 | { |
| 534 | struct netlink *st=sst; |
| 535 | struct netlink_client *c; |
| 536 | |
| 537 | Message(M_DEBUG_CONFIG,"netlink_regnets: request for %d networks, " |
| 538 | "max_start_pad=%d, max_end_pad=%d\n", |
| 539 | nets->entries,max_start_pad,max_end_pad); |
| 540 | |
| 541 | c=safe_malloc(sizeof(*c),"netlink_regnets"); |
| 542 | c->networks=nets; |
| 543 | c->deliver=deliver; |
| 544 | c->dst=dst; |
| 545 | c->name=client_name; /* XXX copy it? */ |
| 546 | c->can_deliver=False; |
| 547 | c->next=st->clients; |
| 548 | st->clients=c; |
| 549 | if (max_start_pad > st->max_start_pad) st->max_start_pad=max_start_pad; |
| 550 | if (max_end_pad > st->max_end_pad) st->max_end_pad=max_end_pad; |
| 551 | |
| 552 | return c; |
| 553 | } |
| 554 | |
| 555 | static netlink_deliver_fn *netlink_init(struct netlink *st, |
| 556 | void *dst, struct cloc loc, |
| 557 | dict_t *dict, string_t description, |
| 558 | netlink_deliver_fn *to_host) |
| 559 | { |
| 560 | st->dst=dst; |
| 561 | st->cl.description=description; |
| 562 | st->cl.type=CL_NETLINK; |
| 563 | st->cl.apply=NULL; |
| 564 | st->cl.interface=&st->ops; |
| 565 | st->ops.st=st; |
| 566 | st->ops.regnets=netlink_regnets; |
| 567 | st->ops.deliver=netlink_from_tunnel; |
| 568 | st->ops.set_delivery=netlink_set_delivery; |
| 569 | st->max_start_pad=0; |
| 570 | st->max_end_pad=0; |
| 571 | st->clients=NULL; |
| 572 | st->deliver_to_host=to_host; |
| 573 | |
| 574 | st->name=dict_read_string(dict,"name",False,"netlink",loc); |
| 575 | if (!st->name) st->name=description; |
| 576 | dict_read_subnet_list(dict, "networks", True, "netlink", loc, |
| 577 | &st->networks); |
| 578 | st->local_address=string_to_ipaddr( |
| 579 | dict_find_item(dict,"local-address", True, "netlink", loc),"netlink"); |
| 580 | st->secnet_address=string_to_ipaddr( |
| 581 | dict_find_item(dict,"secnet-address", True, "netlink", loc),"netlink"); |
| 582 | if (!subnet_match(&st->networks,st->local_address)) { |
| 583 | cfgfatal(loc,"netlink","local-address must be in local networks\n"); |
| 584 | } |
| 585 | st->mtu=dict_read_number(dict, "mtu", False, "netlink", loc, DEFAULT_MTU); |
| 586 | buffer_new(&st->icmp,ICMP_BUFSIZE); |
| 587 | |
| 588 | return netlink_from_host; |
| 589 | } |
| 590 | |
| 591 | /* Connection to the kernel through userv-ipif */ |
| 592 | |
| 593 | struct userv { |
| 594 | struct netlink nl; |
| 595 | int txfd; /* We transmit to userv */ |
| 596 | int rxfd; /* We receive from userv */ |
| 597 | string_t userv_path; |
| 598 | string_t service_user; |
| 599 | string_t service_name; |
| 600 | uint32_t txbuflen; |
| 601 | struct buffer_if *buff; /* We unstuff received packets into here |
| 602 | and send them to the site code. */ |
| 603 | bool_t pending_esc; |
| 604 | netlink_deliver_fn *netlink_to_tunnel; |
| 605 | }; |
| 606 | |
| 607 | static int userv_beforepoll(void *sst, struct pollfd *fds, int *nfds_io, |
| 608 | int *timeout_io, const struct timeval *tv_now, |
| 609 | uint64_t *now) |
| 610 | { |
| 611 | struct userv *st=sst; |
| 612 | *nfds_io=2; |
| 613 | fds[0].fd=st->txfd; |
| 614 | fds[0].events=POLLERR; /* Might want to pick up POLLOUT sometime */ |
| 615 | fds[1].fd=st->rxfd; |
| 616 | fds[1].events=POLLIN|POLLERR|POLLHUP; |
| 617 | return 0; |
| 618 | } |
| 619 | |
| 620 | static void userv_afterpoll(void *sst, struct pollfd *fds, int nfds, |
| 621 | const struct timeval *tv_now, uint64_t *now) |
| 622 | { |
| 623 | struct userv *st=sst; |
| 624 | uint8_t rxbuf[DEFAULT_BUFSIZE]; |
| 625 | int l,i; |
| 626 | |
| 627 | if (fds[1].revents&POLLERR) { |
| 628 | printf("userv_afterpoll: hup!\n"); |
| 629 | } |
| 630 | if (fds[1].revents&POLLIN) { |
| 631 | l=read(st->rxfd,rxbuf,DEFAULT_BUFSIZE); |
| 632 | if (l<0) { |
| 633 | fatal_perror("userv_afterpoll: read(rxfd)"); |
| 634 | } |
| 635 | if (l==0) { |
| 636 | fatal("userv_afterpoll: read(rxfd)=0; userv gone away?\n"); |
| 637 | } |
| 638 | /* XXX really crude unstuff code */ |
| 639 | /* XXX check for buffer overflow */ |
| 640 | BUF_ASSERT_USED(st->buff); |
| 641 | for (i=0; i<l; i++) { |
| 642 | if (st->pending_esc) { |
| 643 | st->pending_esc=False; |
| 644 | switch(rxbuf[i]) { |
| 645 | case SLIP_ESCEND: |
| 646 | *(uint8_t *)buf_append(st->buff,1)=SLIP_END; |
| 647 | break; |
| 648 | case SLIP_ESCESC: |
| 649 | *(uint8_t *)buf_append(st->buff,1)=SLIP_ESC; |
| 650 | break; |
| 651 | default: |
| 652 | fatal("userv_afterpoll: bad SLIP escape character\n"); |
| 653 | } |
| 654 | } else { |
| 655 | switch (rxbuf[i]) { |
| 656 | case SLIP_END: |
| 657 | if (st->buff->size>0) { |
| 658 | st->netlink_to_tunnel(&st->nl,NULL, |
| 659 | st->buff); |
| 660 | BUF_ALLOC(st->buff,"userv_afterpoll"); |
| 661 | } |
| 662 | buffer_init(st->buff,st->nl.max_start_pad); |
| 663 | break; |
| 664 | case SLIP_ESC: |
| 665 | st->pending_esc=True; |
| 666 | break; |
| 667 | default: |
| 668 | *(uint8_t *)buf_append(st->buff,1)=rxbuf[i]; |
| 669 | break; |
| 670 | } |
| 671 | } |
| 672 | } |
| 673 | } |
| 674 | } |
| 675 | |
| 676 | /* Send buf to the kernel. Free buf before returning. */ |
| 677 | static void userv_deliver_to_kernel(void *sst, void *cid, |
| 678 | struct buffer_if *buf) |
| 679 | { |
| 680 | struct userv *st=sst; |
| 681 | uint8_t txbuf[DEFAULT_BUFSIZE]; |
| 682 | uint8_t *i; |
| 683 | uint32_t j; |
| 684 | |
| 685 | BUF_ASSERT_USED(buf); |
| 686 | |
| 687 | /* Spit the packet at userv-ipif: SLIP start marker, then |
| 688 | bytestuff the packet, then SLIP end marker */ |
| 689 | /* XXX crunchy bytestuff code */ |
| 690 | j=0; |
| 691 | txbuf[j++]=SLIP_END; |
| 692 | for (i=buf->start; i<(buf->start+buf->size); i++) { |
| 693 | switch (*i) { |
| 694 | case SLIP_END: |
| 695 | txbuf[j++]=SLIP_ESC; |
| 696 | txbuf[j++]=SLIP_ESCEND; |
| 697 | break; |
| 698 | case SLIP_ESC: |
| 699 | txbuf[j++]=SLIP_ESC; |
| 700 | txbuf[j++]=SLIP_ESCESC; |
| 701 | break; |
| 702 | default: |
| 703 | txbuf[j++]=*i; |
| 704 | break; |
| 705 | } |
| 706 | } |
| 707 | txbuf[j++]=SLIP_END; |
| 708 | if (write(st->txfd,txbuf,j)<0) { |
| 709 | fatal_perror("userv_deliver_to_kernel: write()"); |
| 710 | } |
| 711 | BUF_FREE(buf); |
| 712 | } |
| 713 | |
| 714 | static void userv_phase_hook(void *sst, uint32_t newphase) |
| 715 | { |
| 716 | struct userv *st=sst; |
| 717 | pid_t child; |
| 718 | int c_stdin[2]; |
| 719 | int c_stdout[2]; |
| 720 | string_t addrs; |
| 721 | string_t nets; |
| 722 | string_t s; |
| 723 | struct netlink_client *c; |
| 724 | int i; |
| 725 | |
| 726 | /* This is where we actually invoke userv - all the networks we'll |
| 727 | be using should already have been registered. */ |
| 728 | |
| 729 | addrs=safe_malloc(512,"userv_phase_hook:addrs"); |
| 730 | snprintf(addrs,512,"%s,%s,%d,slip",ipaddr_to_string(st->nl.local_address), |
| 731 | ipaddr_to_string(st->nl.secnet_address),st->nl.mtu); |
| 732 | |
| 733 | nets=safe_malloc(1024,"userv_phase_hook:nets"); |
| 734 | *nets=0; |
| 735 | for (c=st->nl.clients; c; c=c->next) { |
| 736 | for (i=0; i<c->networks->entries; i++) { |
| 737 | s=subnet_to_string(&c->networks->list[i]); |
| 738 | strcat(nets,s); |
| 739 | strcat(nets,","); |
| 740 | free(s); |
| 741 | } |
| 742 | } |
| 743 | nets[strlen(nets)-1]=0; |
| 744 | |
| 745 | Message(M_INFO,"\nuserv_phase_hook: %s %s %s %s %s\n",st->userv_path, |
| 746 | st->service_user,st->service_name,addrs,nets); |
| 747 | |
| 748 | /* Allocate buffer, plus space for padding. Make sure we end up |
| 749 | with the start of the packet well-aligned. */ |
| 750 | /* ALIGN(st->max_start_pad,16); */ |
| 751 | /* ALIGN(st->max_end_pad,16); */ |
| 752 | |
| 753 | st->pending_esc=False; |
| 754 | |
| 755 | /* Invoke userv */ |
| 756 | if (pipe(c_stdin)!=0) { |
| 757 | fatal_perror("userv_phase_hook: pipe(c_stdin)"); |
| 758 | } |
| 759 | if (pipe(c_stdout)!=0) { |
| 760 | fatal_perror("userv_phase_hook: pipe(c_stdout)"); |
| 761 | } |
| 762 | st->txfd=c_stdin[1]; |
| 763 | st->rxfd=c_stdout[0]; |
| 764 | |
| 765 | child=fork(); |
| 766 | if (child==-1) { |
| 767 | fatal_perror("userv_phase_hook: fork()"); |
| 768 | } |
| 769 | if (child==0) { |
| 770 | char **argv; |
| 771 | |
| 772 | /* We are the child. Modify our stdin and stdout, then exec userv */ |
| 773 | dup2(c_stdin[0],0); |
| 774 | dup2(c_stdout[1],1); |
| 775 | close(c_stdin[1]); |
| 776 | close(c_stdout[0]); |
| 777 | |
| 778 | /* The arguments are: |
| 779 | userv |
| 780 | service-user |
| 781 | service-name |
| 782 | local-addr,secnet-addr,mtu,protocol |
| 783 | route1,route2,... */ |
| 784 | argv=malloc(sizeof(*argv)*6); |
| 785 | argv[0]=st->userv_path; |
| 786 | argv[1]=st->service_user; |
| 787 | argv[2]=st->service_name; |
| 788 | argv[3]=addrs; |
| 789 | argv[4]=nets; |
| 790 | argv[5]=NULL; |
| 791 | execvp(st->userv_path,argv); |
| 792 | perror("netlink-userv-ipif: execvp"); |
| 793 | |
| 794 | exit(1); |
| 795 | } |
| 796 | /* We are the parent... */ |
| 797 | |
| 798 | /* Register for poll() */ |
| 799 | register_for_poll(st, userv_beforepoll, userv_afterpoll, 2, st->nl.name); |
| 800 | } |
| 801 | |
| 802 | static list_t *userv_apply(closure_t *self, struct cloc loc, dict_t *context, |
| 803 | list_t *args) |
| 804 | { |
| 805 | struct userv *st; |
| 806 | item_t *item; |
| 807 | dict_t *dict; |
| 808 | |
| 809 | st=safe_malloc(sizeof(*st),"userv_apply"); |
| 810 | |
| 811 | /* First parameter must be a dict */ |
| 812 | item=list_elem(args,0); |
| 813 | if (!item || item->type!=t_dict) |
| 814 | cfgfatal(loc,"userv-ipif","parameter must be a dictionary\n"); |
| 815 | |
| 816 | dict=item->data.dict; |
| 817 | |
| 818 | st->netlink_to_tunnel= |
| 819 | netlink_init(&st->nl,st,loc,dict, |
| 820 | "netlink-userv-ipif",userv_deliver_to_kernel); |
| 821 | |
| 822 | st->userv_path=dict_read_string(dict,"userv-path",False,"userv-netlink", |
| 823 | loc); |
| 824 | st->service_user=dict_read_string(dict,"service-user",False, |
| 825 | "userv-netlink",loc); |
| 826 | st->service_name=dict_read_string(dict,"service-name",False, |
| 827 | "userv-netlink",loc); |
| 828 | if (!st->userv_path) st->userv_path="userv"; |
| 829 | if (!st->service_user) st->service_user="root"; |
| 830 | if (!st->service_name) st->service_name="ipif"; |
| 831 | st->buff=find_cl_if(dict,"buffer",CL_BUFFER,True,"userv-netlink",loc); |
| 832 | BUF_ALLOC(st->buff,"netlink:userv_apply"); |
| 833 | |
| 834 | st->rxfd=-1; st->txfd=-1; |
| 835 | add_hook(PHASE_DROPPRIV,userv_phase_hook,st); |
| 836 | |
| 837 | return new_closure(&st->nl.cl); |
| 838 | } |
| 839 | |
| 840 | /* Connection to the kernel through the universal TUN/TAP driver */ |
| 841 | |
| 842 | struct tun { |
| 843 | struct netlink nl; |
| 844 | int fd; |
| 845 | string_t device_path; |
| 846 | string_t interface_name; |
| 847 | string_t ifconfig_path; |
| 848 | string_t route_path; |
| 849 | struct buffer_if *buff; /* We receive packets into here |
| 850 | and send them to the netlink code. */ |
| 851 | netlink_deliver_fn *netlink_to_tunnel; |
| 852 | }; |
| 853 | |
| 854 | static int tun_beforepoll(void *sst, struct pollfd *fds, int *nfds_io, |
| 855 | int *timeout_io, const struct timeval *tv_now, |
| 856 | uint64_t *now) |
| 857 | { |
| 858 | struct tun *st=sst; |
| 859 | *nfds_io=1; |
| 860 | fds[0].fd=st->fd; |
| 861 | fds[0].events=POLLIN|POLLERR|POLLHUP; |
| 862 | return 0; |
| 863 | } |
| 864 | |
| 865 | static void tun_afterpoll(void *sst, struct pollfd *fds, int nfds, |
| 866 | const struct timeval *tv_now, uint64_t *now) |
| 867 | { |
| 868 | struct tun *st=sst; |
| 869 | int l; |
| 870 | |
| 871 | if (fds[0].revents&POLLERR) { |
| 872 | printf("tun_afterpoll: hup!\n"); |
| 873 | } |
| 874 | if (fds[0].revents&POLLIN) { |
| 875 | BUF_ALLOC(st->buff,"tun_afterpoll"); |
| 876 | buffer_init(st->buff,st->nl.max_start_pad); |
| 877 | l=read(st->fd,st->buff->start,st->buff->len-st->nl.max_start_pad); |
| 878 | if (l<0) { |
| 879 | fatal_perror("tun_afterpoll: read()"); |
| 880 | } |
| 881 | if (l==0) { |
| 882 | fatal("tun_afterpoll: read()=0; device gone away?\n"); |
| 883 | } |
| 884 | if (l>0) { |
| 885 | st->buff->size=l; |
| 886 | st->netlink_to_tunnel(&st->nl,NULL,st->buff); |
| 887 | BUF_ASSERT_FREE(st->buff); |
| 888 | } |
| 889 | } |
| 890 | } |
| 891 | |
| 892 | static void tun_deliver_to_kernel(void *sst, void *cid, |
| 893 | struct buffer_if *buf) |
| 894 | { |
| 895 | struct tun *st=sst; |
| 896 | |
| 897 | BUF_ASSERT_USED(buf); |
| 898 | |
| 899 | /* No error checking, because we'd just throw the packet away anyway */ |
| 900 | write(st->fd,buf->start,buf->size); |
| 901 | BUF_FREE(buf); |
| 902 | } |
| 903 | |
| 904 | static void tun_phase_hook(void *sst, uint32_t newphase) |
| 905 | { |
| 906 | struct tun *st=sst; |
| 907 | string_t hostaddr,secnetaddr; |
| 908 | uint8_t mtu[6]; |
| 909 | string_t network,mask; |
| 910 | struct netlink_client *c; |
| 911 | int i; |
| 912 | |
| 913 | /* All the networks we'll be using have been registered. Invoke ifconfig |
| 914 | to set the TUN device's address, and route to add routes to all |
| 915 | our networks. */ |
| 916 | |
| 917 | hostaddr=ipaddr_to_string(st->nl.local_address); |
| 918 | secnetaddr=ipaddr_to_string(st->nl.secnet_address); |
| 919 | snprintf(mtu,6,"%d",st->nl.mtu); |
| 920 | mtu[5]=0; |
| 921 | |
| 922 | sys_cmd(st->ifconfig_path,"ifconfig",st->interface_name, |
| 923 | hostaddr,"netmask","255.255.255.255","-broadcast", |
| 924 | "pointopoint",secnetaddr,"mtu",mtu,"up",(char *)0); |
| 925 | |
| 926 | for (c=st->nl.clients; c; c=c->next) { |
| 927 | for (i=0; i<c->networks->entries; i++) { |
| 928 | network=ipaddr_to_string(c->networks->list[i].prefix); |
| 929 | mask=ipaddr_to_string(c->networks->list[i].mask); |
| 930 | sys_cmd(st->route_path,"route","add","-net",network, |
| 931 | "netmask",mask,"gw",secnetaddr,(char *)0); |
| 932 | } |
| 933 | } |
| 934 | |
| 935 | /* Register for poll() */ |
| 936 | register_for_poll(st, tun_beforepoll, tun_afterpoll, 1, st->nl.name); |
| 937 | } |
| 938 | |
| 939 | #ifdef HAVE_LINUX_IF_H |
| 940 | static list_t *tun_apply(closure_t *self, struct cloc loc, dict_t *context, |
| 941 | list_t *args) |
| 942 | { |
| 943 | struct tun *st; |
| 944 | item_t *item; |
| 945 | dict_t *dict; |
| 946 | struct ifreq ifr; |
| 947 | |
| 948 | st=safe_malloc(sizeof(*st),"tun_apply"); |
| 949 | |
| 950 | /* First parameter must be a dict */ |
| 951 | item=list_elem(args,0); |
| 952 | if (!item || item->type!=t_dict) |
| 953 | cfgfatal(loc,"tun","parameter must be a dictionary\n"); |
| 954 | |
| 955 | dict=item->data.dict; |
| 956 | |
| 957 | st->netlink_to_tunnel= |
| 958 | netlink_init(&st->nl,st,loc,dict, |
| 959 | "netlink-tun",tun_deliver_to_kernel); |
| 960 | |
| 961 | st->device_path=dict_read_string(dict,"device",False,"tun-netlink",loc); |
| 962 | st->interface_name=dict_read_string(dict,"interface",False, |
| 963 | "tun-netlink",loc); |
| 964 | st->ifconfig_path=dict_read_string(dict,"device",False,"tun-netlink",loc); |
| 965 | st->route_path=dict_read_string(dict,"device",False,"tun-netlink",loc); |
| 966 | |
| 967 | if (!st->device_path) st->device_path="/dev/net/tun"; |
| 968 | if (!st->ifconfig_path) st->ifconfig_path="ifconfig"; |
| 969 | if (!st->route_path) st->route_path="route"; |
| 970 | st->buff=find_cl_if(dict,"buffer",CL_BUFFER,True,"tun-netlink",loc); |
| 971 | |
| 972 | /* New TUN interface: open the device, then do ioctl TUNSETIFF |
| 973 | to set or find out the network interface name. */ |
| 974 | st->fd=open(st->device_path,O_RDWR); |
| 975 | if (st->fd==-1) { |
| 976 | fatal_perror("%s: can't open device file %s",st->nl.name, |
| 977 | st->device_path); |
| 978 | } |
| 979 | memset(&ifr,0,sizeof(ifr)); |
| 980 | ifr.ifr_flags = IFF_TUN | IFF_NO_PI; /* Just send/receive IP packets, |
| 981 | no extra headers */ |
| 982 | if (st->interface_name) |
| 983 | strncpy(ifr.ifr_name,st->interface_name,IFNAMSIZ); |
| 984 | if (ioctl(st->fd,TUNSETIFF,&ifr)<0) { |
| 985 | fatal_perror("%s: ioctl(TUNSETIFF)",st->nl.name); |
| 986 | } |
| 987 | if (!st->interface_name) { |
| 988 | st->interface_name=safe_malloc(strlen(ifr.ifr_name)+1,"tun_apply"); |
| 989 | strcpy(st->interface_name,ifr.ifr_name); |
| 990 | Message(M_INFO,"%s: allocated network interface %s\n",st->nl.name, |
| 991 | st->interface_name); |
| 992 | } |
| 993 | |
| 994 | add_hook(PHASE_DROPPRIV,tun_phase_hook,st); |
| 995 | |
| 996 | return new_closure(&st->nl.cl); |
| 997 | } |
| 998 | #endif /* HAVE_LINUX_IF_H */ |
| 999 | |
| 1000 | static list_t *tun_old_apply(closure_t *self, struct cloc loc, dict_t *context, |
| 1001 | list_t *args) |
| 1002 | { |
| 1003 | struct tun *st; |
| 1004 | item_t *item; |
| 1005 | dict_t *dict; |
| 1006 | bool_t search_for_if; |
| 1007 | |
| 1008 | st=safe_malloc(sizeof(*st),"tun_old_apply"); |
| 1009 | |
| 1010 | Message(M_WARNING,"the tun-old code has never been tested. Please report " |
| 1011 | "success or failure to steve@greenend.org.uk\n"); |
| 1012 | |
| 1013 | /* First parameter must be a dict */ |
| 1014 | item=list_elem(args,0); |
| 1015 | if (!item || item->type!=t_dict) |
| 1016 | cfgfatal(loc,"tun","parameter must be a dictionary\n"); |
| 1017 | |
| 1018 | dict=item->data.dict; |
| 1019 | |
| 1020 | st->netlink_to_tunnel= |
| 1021 | netlink_init(&st->nl,st,loc,dict, |
| 1022 | "netlink-tun",tun_deliver_to_kernel); |
| 1023 | |
| 1024 | st->device_path=dict_read_string(dict,"device",False,"tun-netlink",loc); |
| 1025 | st->interface_name=dict_read_string(dict,"interface",False, |
| 1026 | "tun-netlink",loc); |
| 1027 | search_for_if=dict_read_bool(dict,"interface-search",False,"tun-netlink", |
| 1028 | loc,st->device_path==NULL); |
| 1029 | st->ifconfig_path=dict_read_string(dict,"device",False,"tun-netlink",loc); |
| 1030 | st->route_path=dict_read_string(dict,"device",False,"tun-netlink",loc); |
| 1031 | |
| 1032 | if (!st->device_path) st->device_path="/dev/tun"; |
| 1033 | if (!st->ifconfig_path) st->ifconfig_path="ifconfig"; |
| 1034 | if (!st->route_path) st->route_path="route"; |
| 1035 | st->buff=find_cl_if(dict,"buffer",CL_BUFFER,True,"tun-netlink",loc); |
| 1036 | |
| 1037 | /* Old TUN interface: the network interface name depends on which |
| 1038 | /dev/tunX file we open. If 'interface-search' is set to true, treat |
| 1039 | 'device' as the prefix and try numbers from 0--255. If it's set |
| 1040 | to false, treat 'device' as the whole name, and require than an |
| 1041 | appropriate interface name be specified. */ |
| 1042 | if (search_for_if) { |
| 1043 | string_t dname; |
| 1044 | int i; |
| 1045 | |
| 1046 | if (st->interface_name) { |
| 1047 | cfgfatal(loc,"tun-old","you may not specify an interface name " |
| 1048 | "in interface-search mode\n"); |
| 1049 | } |
| 1050 | dname=safe_malloc(strlen(st->device_path)+4,"tun_old_apply"); |
| 1051 | st->interface_name=safe_malloc(8,"tun_old_apply"); |
| 1052 | |
| 1053 | for (i=0; i<255; i++) { |
| 1054 | sprintf(dname,"%s%d",st->device_path,i); |
| 1055 | if ((st->fd=open(dname,O_RDWR))>0) { |
| 1056 | sprintf(st->interface_name,"tun%d",i); |
| 1057 | Message(M_INFO,"%s: allocated network interface %s " |
| 1058 | "through %s\n",st->nl.name,st->interface_name,dname); |
| 1059 | continue; |
| 1060 | } |
| 1061 | } |
| 1062 | if (st->fd==-1) { |
| 1063 | fatal("%s: unable to open any TUN device (%s...)\n", |
| 1064 | st->nl.name,st->device_path); |
| 1065 | } |
| 1066 | } else { |
| 1067 | if (!st->interface_name) { |
| 1068 | cfgfatal(loc,"tun-old","you must specify an interface name " |
| 1069 | "when you explicitly specify a TUN device file\n"); |
| 1070 | } |
| 1071 | st->fd=open(st->device_path,O_RDWR); |
| 1072 | if (st->fd==-1) { |
| 1073 | fatal_perror("%s: unable to open TUN device file %s", |
| 1074 | st->nl.name,st->device_path); |
| 1075 | } |
| 1076 | } |
| 1077 | |
| 1078 | add_hook(PHASE_DROPPRIV,tun_phase_hook,st); |
| 1079 | |
| 1080 | return new_closure(&st->nl.cl); |
| 1081 | } |
| 1082 | |
| 1083 | /* No connection to the kernel at all... */ |
| 1084 | |
| 1085 | struct null { |
| 1086 | struct netlink nl; |
| 1087 | }; |
| 1088 | |
| 1089 | static void null_deliver(void *sst, void *cid, struct buffer_if *buf) |
| 1090 | { |
| 1091 | return; |
| 1092 | } |
| 1093 | |
| 1094 | static list_t *null_apply(closure_t *self, struct cloc loc, dict_t *context, |
| 1095 | list_t *args) |
| 1096 | { |
| 1097 | struct null *st; |
| 1098 | item_t *item; |
| 1099 | dict_t *dict; |
| 1100 | |
| 1101 | st=safe_malloc(sizeof(*st),"null_apply"); |
| 1102 | |
| 1103 | item=list_elem(args,0); |
| 1104 | if (!item || item->type!=t_dict) |
| 1105 | cfgfatal(loc,"null-netlink","parameter must be a dictionary\n"); |
| 1106 | |
| 1107 | dict=item->data.dict; |
| 1108 | |
| 1109 | netlink_init(&st->nl,st,loc,dict,"null-netlink",null_deliver); |
| 1110 | |
| 1111 | return new_closure(&st->nl.cl); |
| 1112 | } |
| 1113 | |
| 1114 | init_module netlink_module; |
| 1115 | void netlink_module(dict_t *dict) |
| 1116 | { |
| 1117 | add_closure(dict,"userv-ipif",userv_apply); |
| 1118 | #ifdef HAVE_LINUX_IF_H |
| 1119 | add_closure(dict,"tun",tun_apply); |
| 1120 | #endif |
| 1121 | add_closure(dict,"tun-old",tun_old_apply); |
| 1122 | add_closure(dict,"null-netlink",null_apply); |
| 1123 | #if 0 |
| 1124 | /* TODO */ |
| 1125 | add_closure(dict,"pty-slip",ptyslip_apply); |
| 1126 | add_closure(dict,"slipd",slipd_apply); |
| 1127 | #endif /* 0 */ |
| 1128 | } |