1 /* 2 * link_iptnl.c ipip and sit driver module 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Nicolas Dichtel <nicolas.dichtel (at) 6wind.com> 10 * 11 */ 12 13 #include <string.h> 14 #include <net/if.h> 15 #include <sys/types.h> 16 #include <sys/socket.h> 17 #include <arpa/inet.h> 18 19 #include <linux/in.h> 20 #include <linux/ip.h> 21 #include <linux/if_tunnel.h> 22 #include "rt_names.h" 23 #include "utils.h" 24 #include "ip_common.h" 25 #include "tunnel.h" 26 27 static void print_usage(FILE *f, int sit) 28 { 29 const char *type = sit ? "sit " : "ipip"; 30 31 fprintf(f, 32 "Usage: ... %s [ remote ADDR ]\n" 33 " [ local ADDR ]\n" 34 " [ ttl TTL ]\n" 35 " [ tos TOS ]\n" 36 " [ [no]pmtudisc ]\n" 37 " [ dev PHYS_DEV ]\n" 38 " [ 6rd-prefix ADDR ]\n" 39 " [ 6rd-relay_prefix ADDR ]\n" 40 " [ 6rd-reset ]\n" 41 " [ noencap ]\n" 42 " [ encap { fou | gue | none } ]\n" 43 " [ encap-sport PORT ]\n" 44 " [ encap-dport PORT ]\n" 45 " [ [no]encap-csum ]\n" 46 " [ [no]encap-csum6 ]\n" 47 " [ [no]encap-remcsum ]\n", 48 type 49 ); 50 if (sit) { 51 fprintf(f, " [ mode { ip6ip | ipip | mplsip | any } ]\n"); 52 fprintf(f, " [ isatap ]\n"); 53 } else { 54 fprintf(f, " [ mode { ipip | mplsip | any } ]\n"); 55 } 56 fprintf(f, " [ external ]\n"); 57 fprintf(f, " [ fwmark MARK ]\n"); 58 fprintf(f, "\n"); 59 fprintf(f, "Where: ADDR := { IP_ADDRESS | any }\n"); 60 fprintf(f, " TOS := { NUMBER | inherit }\n"); 61 fprintf(f, " TTL := { 1..255 | inherit }\n"); 62 fprintf(f, " MARK := { 0x0..0xffffffff }\n"); 63 } 64 65 static void usage(int sit) __attribute__((noreturn)); 66 static void usage(int sit) 67 { 68 print_usage(stderr, sit); 69 exit(-1); 70 } 71 72 static int iptunnel_parse_opt(struct link_util *lu, int argc, char **argv, 73 struct nlmsghdr *n) 74 { 75 struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1); 76 struct { 77 struct nlmsghdr n; 78 struct ifinfomsg i; 79 char buf[2048]; 80 } req = { 81 .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)), 82 .n.nlmsg_flags = NLM_F_REQUEST, 83 .n.nlmsg_type = RTM_GETLINK, 84 .i.ifi_family = preferred_family, 85 .i.ifi_index = ifi->ifi_index, 86 }; 87 struct rtattr *tb[IFLA_MAX + 1]; 88 struct rtattr *linkinfo[IFLA_INFO_MAX+1]; 89 struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1]; 90 int len; 91 __u32 link = 0; 92 __u32 laddr = 0; 93 __u32 raddr = 0; 94 __u8 ttl = 0; 95 __u8 tos = 0; 96 __u8 pmtudisc = 1; 97 __u16 iflags = 0; 98 __u8 proto = 0; 99 struct in6_addr ip6rdprefix = {}; 100 __u16 ip6rdprefixlen = 0; 101 __u32 ip6rdrelayprefix = 0; 102 __u16 ip6rdrelayprefixlen = 0; 103 __u16 encaptype = 0; 104 __u16 encapflags = 0; 105 __u16 encapsport = 0; 106 __u16 encapdport = 0; 107 __u8 metadata = 0; 108 __u32 fwmark = 0; 109 110 if (!(n->nlmsg_flags & NLM_F_CREATE)) { 111 if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0) { 112 get_failed: 113 fprintf(stderr, 114 "Failed to get existing tunnel info.\n"); 115 return -1; 116 } 117 118 len = req.n.nlmsg_len; 119 len -= NLMSG_LENGTH(sizeof(*ifi)); 120 if (len < 0) 121 goto get_failed; 122 123 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len); 124 125 if (!tb[IFLA_LINKINFO]) 126 goto get_failed; 127 128 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]); 129 130 if (!linkinfo[IFLA_INFO_DATA]) 131 goto get_failed; 132 133 parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX, 134 linkinfo[IFLA_INFO_DATA]); 135 136 if (iptuninfo[IFLA_IPTUN_LOCAL]) 137 laddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LOCAL]); 138 139 if (iptuninfo[IFLA_IPTUN_REMOTE]) 140 raddr = rta_getattr_u32(iptuninfo[IFLA_IPTUN_REMOTE]); 141 142 if (iptuninfo[IFLA_IPTUN_TTL]) 143 ttl = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]); 144 145 if (iptuninfo[IFLA_IPTUN_TOS]) 146 tos = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TOS]); 147 148 if (iptuninfo[IFLA_IPTUN_PMTUDISC]) 149 pmtudisc = 150 rta_getattr_u8(iptuninfo[IFLA_IPTUN_PMTUDISC]); 151 152 if (iptuninfo[IFLA_IPTUN_FLAGS]) 153 iflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_FLAGS]); 154 155 if (iptuninfo[IFLA_IPTUN_LINK]) 156 link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]); 157 158 if (iptuninfo[IFLA_IPTUN_PROTO]) 159 proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]); 160 161 if (iptuninfo[IFLA_IPTUN_ENCAP_TYPE]) 162 encaptype = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_TYPE]); 163 if (iptuninfo[IFLA_IPTUN_ENCAP_FLAGS]) 164 encapflags = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_FLAGS]); 165 if (iptuninfo[IFLA_IPTUN_ENCAP_SPORT]) 166 encapsport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_SPORT]); 167 if (iptuninfo[IFLA_IPTUN_ENCAP_DPORT]) 168 encapdport = rta_getattr_u16(iptuninfo[IFLA_IPTUN_ENCAP_DPORT]); 169 if (iptuninfo[IFLA_IPTUN_6RD_PREFIX]) 170 memcpy(&ip6rdprefix, 171 RTA_DATA(iptuninfo[IFLA_IPTUN_6RD_PREFIX]), 172 sizeof(laddr)); 173 174 if (iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN]) 175 ip6rdprefixlen = 176 rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_PREFIXLEN]); 177 178 if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX]) 179 ip6rdrelayprefix = 180 rta_getattr_u32(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIX]); 181 182 if (iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]) 183 ip6rdrelayprefixlen = 184 rta_getattr_u16(iptuninfo[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 185 if (iptuninfo[IFLA_IPTUN_COLLECT_METADATA]) 186 metadata = 1; 187 188 if (iptuninfo[IFLA_IPTUN_FWMARK]) 189 fwmark = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FWMARK]); 190 191 } 192 193 while (argc > 0) { 194 if (strcmp(*argv, "remote") == 0) { 195 NEXT_ARG(); 196 if (strcmp(*argv, "any")) 197 raddr = get_addr32(*argv); 198 else 199 raddr = 0; 200 } else if (strcmp(*argv, "local") == 0) { 201 NEXT_ARG(); 202 if (strcmp(*argv, "any")) 203 laddr = get_addr32(*argv); 204 else 205 laddr = 0; 206 } else if (matches(*argv, "dev") == 0) { 207 NEXT_ARG(); 208 link = if_nametoindex(*argv); 209 if (link == 0) 210 invarg("\"dev\" is invalid", *argv); 211 } else if (strcmp(*argv, "ttl") == 0 || 212 strcmp(*argv, "hoplimit") == 0) { 213 NEXT_ARG(); 214 if (strcmp(*argv, "inherit") != 0) { 215 if (get_u8(&ttl, *argv, 0)) 216 invarg("invalid TTL\n", *argv); 217 } else 218 ttl = 0; 219 } else if (strcmp(*argv, "tos") == 0 || 220 strcmp(*argv, "tclass") == 0 || 221 matches(*argv, "dsfield") == 0) { 222 __u32 uval; 223 224 NEXT_ARG(); 225 if (strcmp(*argv, "inherit") != 0) { 226 if (rtnl_dsfield_a2n(&uval, *argv)) 227 invarg("bad TOS value", *argv); 228 tos = uval; 229 } else 230 tos = 1; 231 } else if (strcmp(*argv, "nopmtudisc") == 0) { 232 pmtudisc = 0; 233 } else if (strcmp(*argv, "pmtudisc") == 0) { 234 pmtudisc = 1; 235 } else if (strcmp(lu->id, "sit") == 0 && 236 strcmp(*argv, "isatap") == 0) { 237 iflags |= SIT_ISATAP; 238 } else if (strcmp(lu->id, "sit") == 0 && 239 strcmp(*argv, "mode") == 0) { 240 NEXT_ARG(); 241 if (strcmp(*argv, "ipv6/ipv4") == 0 || 242 strcmp(*argv, "ip6ip") == 0) 243 proto = IPPROTO_IPV6; 244 else if (strcmp(*argv, "ipv4/ipv4") == 0 || 245 strcmp(*argv, "ipip") == 0 || 246 strcmp(*argv, "ip4ip4") == 0) 247 proto = IPPROTO_IPIP; 248 else if (strcmp(*argv, "mpls/ipv4") == 0 || 249 strcmp(*argv, "mplsip") == 0) 250 proto = IPPROTO_MPLS; 251 else if (strcmp(*argv, "any/ipv4") == 0 || 252 strcmp(*argv, "any") == 0) 253 proto = 0; 254 else 255 invarg("Cannot guess tunnel mode.", *argv); 256 } else if (strcmp(lu->id, "ipip") == 0 && 257 strcmp(*argv, "mode") == 0) { 258 NEXT_ARG(); 259 if (strcmp(*argv, "ipv4/ipv4") == 0 || 260 strcmp(*argv, "ipip") == 0 || 261 strcmp(*argv, "ip4ip4") == 0) 262 proto = IPPROTO_IPIP; 263 else if (strcmp(*argv, "mpls/ipv4") == 0 || 264 strcmp(*argv, "mplsip") == 0) 265 proto = IPPROTO_MPLS; 266 else if (strcmp(*argv, "any/ipv4") == 0 || 267 strcmp(*argv, "any") == 0) 268 proto = 0; 269 else 270 invarg("Cannot guess tunnel mode.", *argv); 271 } else if (strcmp(*argv, "noencap") == 0) { 272 encaptype = TUNNEL_ENCAP_NONE; 273 } else if (strcmp(*argv, "encap") == 0) { 274 NEXT_ARG(); 275 if (strcmp(*argv, "fou") == 0) 276 encaptype = TUNNEL_ENCAP_FOU; 277 else if (strcmp(*argv, "gue") == 0) 278 encaptype = TUNNEL_ENCAP_GUE; 279 else if (strcmp(*argv, "none") == 0) 280 encaptype = TUNNEL_ENCAP_NONE; 281 else 282 invarg("Invalid encap type.", *argv); 283 } else if (strcmp(*argv, "encap-sport") == 0) { 284 NEXT_ARG(); 285 if (strcmp(*argv, "auto") == 0) 286 encapsport = 0; 287 else if (get_u16(&encapsport, *argv, 0)) 288 invarg("Invalid source port.", *argv); 289 } else if (strcmp(*argv, "encap-dport") == 0) { 290 NEXT_ARG(); 291 if (get_u16(&encapdport, *argv, 0)) 292 invarg("Invalid destination port.", *argv); 293 } else if (strcmp(*argv, "encap-csum") == 0) { 294 encapflags |= TUNNEL_ENCAP_FLAG_CSUM; 295 } else if (strcmp(*argv, "noencap-csum") == 0) { 296 encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM; 297 } else if (strcmp(*argv, "encap-udp6-csum") == 0) { 298 encapflags |= TUNNEL_ENCAP_FLAG_CSUM6; 299 } else if (strcmp(*argv, "noencap-udp6-csum") == 0) { 300 encapflags &= ~TUNNEL_ENCAP_FLAG_CSUM6; 301 } else if (strcmp(*argv, "encap-remcsum") == 0) { 302 encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM; 303 } else if (strcmp(*argv, "noencap-remcsum") == 0) { 304 encapflags &= ~TUNNEL_ENCAP_FLAG_REMCSUM; 305 } else if (strcmp(*argv, "external") == 0) { 306 metadata = 1; 307 } else if (strcmp(*argv, "6rd-prefix") == 0) { 308 inet_prefix prefix; 309 310 NEXT_ARG(); 311 if (get_prefix(&prefix, *argv, AF_INET6)) 312 invarg("invalid 6rd_prefix\n", *argv); 313 memcpy(&ip6rdprefix, prefix.data, 16); 314 ip6rdprefixlen = prefix.bitlen; 315 } else if (strcmp(*argv, "6rd-relay_prefix") == 0) { 316 inet_prefix prefix; 317 318 NEXT_ARG(); 319 if (get_prefix(&prefix, *argv, AF_INET)) 320 invarg("invalid 6rd-relay_prefix\n", *argv); 321 memcpy(&ip6rdrelayprefix, prefix.data, 4); 322 ip6rdrelayprefixlen = prefix.bitlen; 323 } else if (strcmp(*argv, "6rd-reset") == 0) { 324 inet_prefix prefix; 325 326 get_prefix(&prefix, "2002::", AF_INET6); 327 memcpy(&ip6rdprefix, prefix.data, 16); 328 ip6rdprefixlen = 16; 329 ip6rdrelayprefix = 0; 330 ip6rdrelayprefixlen = 0; 331 } else if (strcmp(*argv, "fwmark") == 0) { 332 NEXT_ARG(); 333 if (get_u32(&fwmark, *argv, 0)) 334 invarg("invalid fwmark\n", *argv); 335 } else 336 usage(strcmp(lu->id, "sit") == 0); 337 argc--, argv++; 338 } 339 340 if (ttl && pmtudisc == 0) { 341 fprintf(stderr, "ttl != 0 and nopmtudisc are incompatible\n"); 342 exit(-1); 343 } 344 345 if (metadata) { 346 addattr_l(n, 1024, IFLA_IPTUN_COLLECT_METADATA, NULL, 0); 347 return 0; 348 } 349 350 addattr32(n, 1024, IFLA_IPTUN_LINK, link); 351 addattr32(n, 1024, IFLA_IPTUN_LOCAL, laddr); 352 addattr32(n, 1024, IFLA_IPTUN_REMOTE, raddr); 353 addattr8(n, 1024, IFLA_IPTUN_TTL, ttl); 354 addattr8(n, 1024, IFLA_IPTUN_TOS, tos); 355 addattr8(n, 1024, IFLA_IPTUN_PMTUDISC, pmtudisc); 356 addattr32(n, 1024, IFLA_IPTUN_FWMARK, fwmark); 357 358 addattr16(n, 1024, IFLA_IPTUN_ENCAP_TYPE, encaptype); 359 addattr16(n, 1024, IFLA_IPTUN_ENCAP_FLAGS, encapflags); 360 addattr16(n, 1024, IFLA_IPTUN_ENCAP_SPORT, htons(encapsport)); 361 addattr16(n, 1024, IFLA_IPTUN_ENCAP_DPORT, htons(encapdport)); 362 363 if (strcmp(lu->id, "ipip") == 0 || strcmp(lu->id, "sit") == 0) 364 addattr8(n, 1024, IFLA_IPTUN_PROTO, proto); 365 366 if (strcmp(lu->id, "sit") == 0) { 367 addattr16(n, 1024, IFLA_IPTUN_FLAGS, iflags); 368 if (ip6rdprefixlen) { 369 addattr_l(n, 1024, IFLA_IPTUN_6RD_PREFIX, 370 &ip6rdprefix, sizeof(ip6rdprefix)); 371 addattr16(n, 1024, IFLA_IPTUN_6RD_PREFIXLEN, 372 ip6rdprefixlen); 373 addattr32(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIX, 374 ip6rdrelayprefix); 375 addattr16(n, 1024, IFLA_IPTUN_6RD_RELAY_PREFIXLEN, 376 ip6rdrelayprefixlen); 377 } 378 } 379 380 return 0; 381 } 382 383 static void iptunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]) 384 { 385 char s1[1024]; 386 char s2[64]; 387 const char *local = "any"; 388 const char *remote = "any"; 389 __u16 prefixlen, type; 390 391 if (!tb) 392 return; 393 394 if (tb[IFLA_IPTUN_REMOTE]) { 395 unsigned int addr = rta_getattr_u32(tb[IFLA_IPTUN_REMOTE]); 396 397 if (addr) 398 remote = format_host(AF_INET, 4, &addr); 399 } 400 401 print_string(PRINT_ANY, "remote", "remote %s ", remote); 402 403 if (tb[IFLA_IPTUN_LOCAL]) { 404 unsigned int addr = rta_getattr_u32(tb[IFLA_IPTUN_LOCAL]); 405 406 if (addr) 407 local = format_host(AF_INET, 4, &addr); 408 } 409 410 print_string(PRINT_ANY, "local", "local %s ", local); 411 412 if (tb[IFLA_IPTUN_LINK] && rta_getattr_u32(tb[IFLA_IPTUN_LINK])) { 413 unsigned int link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]); 414 const char *n = if_indextoname(link, s2); 415 416 if (n) 417 print_string(PRINT_ANY, "link", "dev %s ", n); 418 else 419 print_int(PRINT_ANY, "link_index", "dev %u ", link); 420 } 421 422 if (tb[IFLA_IPTUN_TTL]) { 423 __u8 ttl = rta_getattr_u8(tb[IFLA_IPTUN_TTL]); 424 425 if (ttl) 426 print_int(PRINT_ANY, "ttl", "ttl %d ", ttl); 427 else 428 print_int(PRINT_JSON, "ttl", NULL, ttl); 429 } else { 430 print_string(PRINT_FP, NULL, "ttl %s ", "inherit"); 431 } 432 433 if (tb[IFLA_IPTUN_TOS]) { 434 int tos = rta_getattr_u8(tb[IFLA_IPTUN_TOS]); 435 436 if (tos) { 437 if (is_json_context()) { 438 print_0xhex(PRINT_JSON, "tos", "%#x", tos); 439 } else { 440 fputs("tos ", f); 441 if (tos == 1) 442 fputs("inherit ", f); 443 else 444 fprintf(f, "0x%x ", tos); 445 } 446 } 447 } 448 449 if (tb[IFLA_IPTUN_PMTUDISC] && rta_getattr_u8(tb[IFLA_IPTUN_PMTUDISC])) 450 print_bool(PRINT_ANY, "pmtudisc", "pmtudisc ", true); 451 else 452 print_bool(PRINT_ANY, "pmtudisc", "nopmtudisc ", false); 453 454 if (tb[IFLA_IPTUN_FLAGS]) { 455 __u16 iflags = rta_getattr_u16(tb[IFLA_IPTUN_FLAGS]); 456 457 if (iflags & SIT_ISATAP) 458 print_bool(PRINT_ANY, "isatap", "isatap ", true); 459 } 460 461 if (tb[IFLA_IPTUN_6RD_PREFIXLEN] && 462 (prefixlen = rta_getattr_u16(tb[IFLA_IPTUN_6RD_PREFIXLEN]))) { 463 __u16 relayprefixlen = 464 rta_getattr_u16(tb[IFLA_IPTUN_6RD_RELAY_PREFIXLEN]); 465 __u32 relayprefix = 466 rta_getattr_u32(tb[IFLA_IPTUN_6RD_RELAY_PREFIX]); 467 468 const char *prefix = inet_ntop(AF_INET6, 469 RTA_DATA(tb[IFLA_IPTUN_6RD_PREFIX]), 470 s1, sizeof(s1)); 471 472 if (is_json_context()) { 473 print_string(PRINT_JSON, "prefix", NULL, prefix); 474 print_int(PRINT_JSON, "prefixlen", NULL, prefixlen); 475 if (relayprefix) { 476 print_string(PRINT_JSON, 477 "relay_prefix", 478 NULL, 479 format_host(AF_INET, 480 4, 481 &relayprefix)); 482 print_int(PRINT_JSON, 483 "relay_prefixlen", 484 NULL, 485 relayprefixlen); 486 } 487 } else { 488 printf("6rd-prefix %s/%u ", prefix, prefixlen); 489 if (relayprefix) { 490 printf("6rd-relay_prefix %s/%u ", 491 format_host(AF_INET, 4, &relayprefix), 492 relayprefixlen); 493 } 494 } 495 } 496 497 if (tb[IFLA_IPTUN_ENCAP_TYPE] && 498 (type = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_TYPE])) != TUNNEL_ENCAP_NONE) { 499 __u16 flags = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_FLAGS]); 500 __u16 sport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_SPORT]); 501 __u16 dport = rta_getattr_u16(tb[IFLA_IPTUN_ENCAP_DPORT]); 502 503 print_string(PRINT_FP, NULL, "encap ", NULL); 504 switch (type) { 505 case TUNNEL_ENCAP_FOU: 506 print_string(PRINT_ANY, "type", "%s ", "fou"); 507 break; 508 case TUNNEL_ENCAP_GUE: 509 print_string(PRINT_ANY, "type", "%s ", "gue"); 510 break; 511 default: 512 print_null(PRINT_ANY, "type", "unknown ", NULL); 513 break; 514 } 515 516 if (is_json_context()) { 517 print_uint(PRINT_JSON, 518 "sport", 519 NULL, 520 sport ? ntohs(sport) : 0); 521 print_uint(PRINT_JSON, "dport", NULL, ntohs(dport)); 522 print_bool(PRINT_JSON, 523 "csum", 524 NULL, 525 flags & TUNNEL_ENCAP_FLAG_CSUM); 526 print_bool(PRINT_JSON, 527 "csum6", 528 NULL, 529 flags & TUNNEL_ENCAP_FLAG_CSUM6); 530 print_bool(PRINT_JSON, 531 "remcsum", 532 NULL, 533 flags & TUNNEL_ENCAP_FLAG_REMCSUM); 534 close_json_object(); 535 } else { 536 if (sport == 0) 537 fputs("encap-sport auto ", f); 538 else 539 fprintf(f, "encap-sport %u", ntohs(sport)); 540 541 fprintf(f, "encap-dport %u ", ntohs(dport)); 542 543 if (flags & TUNNEL_ENCAP_FLAG_CSUM) 544 fputs("encap-csum ", f); 545 else 546 fputs("noencap-csum ", f); 547 548 if (flags & TUNNEL_ENCAP_FLAG_CSUM6) 549 fputs("encap-csum6 ", f); 550 else 551 fputs("noencap-csum6 ", f); 552 553 if (flags & TUNNEL_ENCAP_FLAG_REMCSUM) 554 fputs("encap-remcsum ", f); 555 else 556 fputs("noencap-remcsum ", f); 557 } 558 } 559 560 if (tb[IFLA_IPTUN_FWMARK]) { 561 __u32 fwmark = rta_getattr_u32(tb[IFLA_IPTUN_FWMARK]); 562 563 if (fwmark) { 564 snprintf(s2, sizeof(s2), "0x%x", fwmark); 565 566 print_string(PRINT_ANY, "fwmark", "fwmark %s ", s2); 567 } 568 } 569 } 570 571 static void iptunnel_print_help(struct link_util *lu, int argc, char **argv, 572 FILE *f) 573 { 574 print_usage(f, strcmp(lu->id, "sit") == 0); 575 } 576 577 struct link_util ipip_link_util = { 578 .id = "ipip", 579 .maxattr = IFLA_IPTUN_MAX, 580 .parse_opt = iptunnel_parse_opt, 581 .print_opt = iptunnel_print_opt, 582 .print_help = iptunnel_print_help, 583 }; 584 585 struct link_util sit_link_util = { 586 .id = "sit", 587 .maxattr = IFLA_IPTUN_MAX, 588 .parse_opt = iptunnel_parse_opt, 589 .print_opt = iptunnel_print_opt, 590 .print_help = iptunnel_print_help, 591 }; 592
