1 /* 2 * link_ip6tnl.c ip6tnl 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/ip.h> 20 #include <linux/if_tunnel.h> 21 #include <linux/ip6_tunnel.h> 22 #include "rt_names.h" 23 #include "utils.h" 24 #include "ip_common.h" 25 #include "tunnel.h" 26 27 #define IP6_FLOWINFO_TCLASS htonl(0x0FF00000) 28 #define IP6_FLOWINFO_FLOWLABEL htonl(0x000FFFFF) 29 30 #define DEFAULT_TNL_HOP_LIMIT (64) 31 32 static void print_usage(FILE *f) 33 { 34 fprintf(f, "Usage: ip link { add | set | change | replace | del } NAME\n"); 35 fprintf(f, " [ mode { ip6ip6 | ipip6 | any } ]\n"); 36 fprintf(f, " type ip6tnl [ remote ADDR ] [ local ADDR ]\n"); 37 fprintf(f, " [ dev PHYS_DEV ] [ encaplimit ELIM ]\n"); 38 fprintf(f ," [ hoplimit HLIM ] [ tclass TCLASS ] [ flowlabel FLOWLABEL ]\n"); 39 fprintf(f, " [ dscp inherit ] [ fwmark inherit ]\n"); 40 fprintf(f, "\n"); 41 fprintf(f, "Where: NAME := STRING\n"); 42 fprintf(f, " ADDR := IPV6_ADDRESS\n"); 43 fprintf(f, " ELIM := { none | 0..255 }(default=%d)\n", 44 IPV6_DEFAULT_TNL_ENCAP_LIMIT); 45 fprintf(f, " HLIM := 0..255 (default=%d)\n", 46 DEFAULT_TNL_HOP_LIMIT); 47 fprintf(f, " TCLASS := { 0x0..0xff | inherit }\n"); 48 fprintf(f, " FLOWLABEL := { 0x0..0xfffff | inherit }\n"); 49 } 50 51 static void usage(void) __attribute__((noreturn)); 52 static void usage(void) 53 { 54 print_usage(stderr); 55 exit(-1); 56 } 57 58 static int ip6tunnel_parse_opt(struct link_util *lu, int argc, char **argv, 59 struct nlmsghdr *n) 60 { 61 struct { 62 struct nlmsghdr n; 63 struct ifinfomsg i; 64 char buf[2048]; 65 } req; 66 struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1); 67 struct rtattr *tb[IFLA_MAX + 1]; 68 struct rtattr *linkinfo[IFLA_INFO_MAX+1]; 69 struct rtattr *iptuninfo[IFLA_IPTUN_MAX + 1]; 70 int len; 71 struct in6_addr laddr; 72 struct in6_addr raddr; 73 __u8 hop_limit = DEFAULT_TNL_HOP_LIMIT; 74 __u8 encap_limit = IPV6_DEFAULT_TNL_ENCAP_LIMIT; 75 __u32 flowinfo = 0; 76 __u32 flags = 0; 77 __u32 link = 0; 78 __u8 proto = 0; 79 80 memset(&laddr, 0, sizeof(laddr)); 81 memset(&raddr, 0, sizeof(raddr)); 82 83 if (!(n->nlmsg_flags & NLM_F_CREATE)) { 84 memset(&req, 0, sizeof(req)); 85 86 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)); 87 req.n.nlmsg_flags = NLM_F_REQUEST; 88 req.n.nlmsg_type = RTM_GETLINK; 89 req.i.ifi_family = preferred_family; 90 req.i.ifi_index = ifi->ifi_index; 91 92 if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0) { 93 get_failed: 94 fprintf(stderr, 95 "Failed to get existing tunnel info.\n"); 96 return -1; 97 } 98 99 len = req.n.nlmsg_len; 100 len -= NLMSG_LENGTH(sizeof(*ifi)); 101 if (len < 0) 102 goto get_failed; 103 104 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len); 105 106 if (!tb[IFLA_LINKINFO]) 107 goto get_failed; 108 109 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]); 110 111 if (!linkinfo[IFLA_INFO_DATA]) 112 goto get_failed; 113 114 parse_rtattr_nested(iptuninfo, IFLA_IPTUN_MAX, 115 linkinfo[IFLA_INFO_DATA]); 116 117 if (iptuninfo[IFLA_IPTUN_LOCAL]) 118 memcpy(&laddr, RTA_DATA(iptuninfo[IFLA_IPTUN_LOCAL]), 119 sizeof(laddr)); 120 121 if (iptuninfo[IFLA_IPTUN_REMOTE]) 122 memcpy(&raddr, RTA_DATA(iptuninfo[IFLA_IPTUN_REMOTE]), 123 sizeof(raddr)); 124 125 if (iptuninfo[IFLA_IPTUN_TTL]) 126 hop_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_TTL]); 127 128 if (iptuninfo[IFLA_IPTUN_ENCAP_LIMIT]) 129 encap_limit = rta_getattr_u8(iptuninfo[IFLA_IPTUN_ENCAP_LIMIT]); 130 131 if (iptuninfo[IFLA_IPTUN_FLOWINFO]) 132 flowinfo = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLOWINFO]); 133 134 if (iptuninfo[IFLA_IPTUN_FLAGS]) 135 flags = rta_getattr_u32(iptuninfo[IFLA_IPTUN_FLAGS]); 136 137 if (iptuninfo[IFLA_IPTUN_LINK]) 138 link = rta_getattr_u32(iptuninfo[IFLA_IPTUN_LINK]); 139 140 if (iptuninfo[IFLA_IPTUN_PROTO]) 141 proto = rta_getattr_u8(iptuninfo[IFLA_IPTUN_PROTO]); 142 } 143 144 while (argc > 0) { 145 if (matches(*argv, "mode") == 0) { 146 NEXT_ARG(); 147 if (strcmp(*argv, "ipv6/ipv6") == 0 || 148 strcmp(*argv, "ip6ip6") == 0) 149 proto = IPPROTO_IPV6; 150 else if (strcmp(*argv, "ip/ipv6") == 0 || 151 strcmp(*argv, "ipv4/ipv6") == 0 || 152 strcmp(*argv, "ipip6") == 0 || 153 strcmp(*argv, "ip4ip6") == 0) 154 proto = IPPROTO_IPIP; 155 else if (strcmp(*argv, "any/ipv6") == 0 || 156 strcmp(*argv, "any") == 0) 157 proto = 0; 158 else 159 invarg("Cannot guess tunnel mode.", *argv); 160 } else if (strcmp(*argv, "remote") == 0) { 161 inet_prefix addr; 162 NEXT_ARG(); 163 get_prefix(&addr, *argv, preferred_family); 164 if (addr.family == AF_UNSPEC) 165 invarg("\"remote\" address family is AF_UNSPEC", *argv); 166 memcpy(&raddr, addr.data, addr.bytelen); 167 } else if (strcmp(*argv, "local") == 0) { 168 inet_prefix addr; 169 NEXT_ARG(); 170 get_prefix(&addr, *argv, preferred_family); 171 if (addr.family == AF_UNSPEC) 172 invarg("\"local\" address family is AF_UNSPEC", *argv); 173 memcpy(&laddr, addr.data, addr.bytelen); 174 } else if (matches(*argv, "dev") == 0) { 175 NEXT_ARG(); 176 link = if_nametoindex(*argv); 177 if (link == 0) 178 invarg("\"dev\" is invalid", *argv); 179 } else if (strcmp(*argv, "hoplimit") == 0 || 180 strcmp(*argv, "ttl") == 0 || 181 strcmp(*argv, "hlim") == 0) { 182 __u8 uval; 183 NEXT_ARG(); 184 if (get_u8(&uval, *argv, 0)) 185 invarg("invalid HLIM", *argv); 186 hop_limit = uval; 187 } else if (matches(*argv, "encaplimit") == 0) { 188 NEXT_ARG(); 189 if (strcmp(*argv, "none") == 0) { 190 flags |= IP6_TNL_F_IGN_ENCAP_LIMIT; 191 } else { 192 __u8 uval; 193 if (get_u8(&uval, *argv, 0) < -1) 194 invarg("invalid ELIM", *argv); 195 encap_limit = uval; 196 flags &= ~IP6_TNL_F_IGN_ENCAP_LIMIT; 197 } 198 } else if (strcmp(*argv, "tclass") == 0 || 199 strcmp(*argv, "tc") == 0 || 200 strcmp(*argv, "tos") == 0 || 201 matches(*argv, "dsfield") == 0) { 202 __u8 uval; 203 NEXT_ARG(); 204 flowinfo &= ~IP6_FLOWINFO_TCLASS; 205 if (strcmp(*argv, "inherit") == 0) 206 flags |= IP6_TNL_F_USE_ORIG_TCLASS; 207 else { 208 if (get_u8(&uval, *argv, 16)) 209 invarg("invalid TClass", *argv); 210 flowinfo |= htonl((__u32)uval << 20) & IP6_FLOWINFO_TCLASS; 211 flags &= ~IP6_TNL_F_USE_ORIG_TCLASS; 212 } 213 } else if (strcmp(*argv, "flowlabel") == 0 || 214 strcmp(*argv, "fl") == 0) { 215 __u32 uval; 216 NEXT_ARG(); 217 flowinfo &= ~IP6_FLOWINFO_FLOWLABEL; 218 if (strcmp(*argv, "inherit") == 0) 219 flags |= IP6_TNL_F_USE_ORIG_FLOWLABEL; 220 else { 221 if (get_u32(&uval, *argv, 16)) 222 invarg("invalid Flowlabel", *argv); 223 if (uval > 0xFFFFF) 224 invarg("invalid Flowlabel", *argv); 225 flowinfo |= htonl(uval) & IP6_FLOWINFO_FLOWLABEL; 226 flags &= ~IP6_TNL_F_USE_ORIG_FLOWLABEL; 227 } 228 } else if (strcmp(*argv, "dscp") == 0) { 229 NEXT_ARG(); 230 if (strcmp(*argv, "inherit") != 0) 231 invarg("not inherit", *argv); 232 flags |= IP6_TNL_F_RCV_DSCP_COPY; 233 } else if (strcmp(*argv, "fwmark") == 0) { 234 NEXT_ARG(); 235 if (strcmp(*argv, "inherit") != 0) 236 invarg("not inherit", *argv); 237 flags |= IP6_TNL_F_USE_ORIG_FWMARK; 238 } else 239 usage(); 240 argc--, argv++; 241 } 242 243 addattr8(n, 1024, IFLA_IPTUN_PROTO, proto); 244 addattr_l(n, 1024, IFLA_IPTUN_LOCAL, &laddr, sizeof(laddr)); 245 addattr_l(n, 1024, IFLA_IPTUN_REMOTE, &raddr, sizeof(raddr)); 246 addattr8(n, 1024, IFLA_IPTUN_TTL, hop_limit); 247 addattr8(n, 1024, IFLA_IPTUN_ENCAP_LIMIT, encap_limit); 248 addattr32(n, 1024, IFLA_IPTUN_FLOWINFO, flowinfo); 249 addattr32(n, 1024, IFLA_IPTUN_FLAGS, flags); 250 addattr32(n, 1024, IFLA_IPTUN_LINK, link); 251 252 return 0; 253 } 254 255 static void ip6tunnel_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]) 256 { 257 char s1[256]; 258 char s2[64]; 259 int flags = 0; 260 __u32 flowinfo = 0; 261 262 if (!tb) 263 return; 264 265 if (tb[IFLA_IPTUN_FLAGS]) 266 flags = rta_getattr_u32(tb[IFLA_IPTUN_FLAGS]); 267 268 if (tb[IFLA_IPTUN_FLOWINFO]) 269 flowinfo = rta_getattr_u32(tb[IFLA_IPTUN_FLOWINFO]); 270 271 if (tb[IFLA_IPTUN_PROTO]) { 272 switch (rta_getattr_u8(tb[IFLA_IPTUN_PROTO])) { 273 case IPPROTO_IPIP: 274 fprintf(f, "ipip6 "); 275 break; 276 case IPPROTO_IPV6: 277 fprintf(f, "ip6ip6 "); 278 break; 279 case 0: 280 fprintf(f, "any "); 281 break; 282 } 283 } 284 285 if (tb[IFLA_IPTUN_REMOTE]) { 286 fprintf(f, "remote %s ", 287 rt_addr_n2a(AF_INET6, 288 RTA_PAYLOAD(tb[IFLA_IPTUN_REMOTE]), 289 RTA_DATA(tb[IFLA_IPTUN_REMOTE]), 290 s1, sizeof(s1))); 291 } 292 293 if (tb[IFLA_IPTUN_LOCAL]) { 294 fprintf(f, "local %s ", 295 rt_addr_n2a(AF_INET6, 296 RTA_PAYLOAD(tb[IFLA_IPTUN_LOCAL]), 297 RTA_DATA(tb[IFLA_IPTUN_LOCAL]), 298 s1, sizeof(s1))); 299 } 300 301 if (tb[IFLA_IPTUN_LINK] && rta_getattr_u32(tb[IFLA_IPTUN_LINK])) { 302 unsigned link = rta_getattr_u32(tb[IFLA_IPTUN_LINK]); 303 const char *n = if_indextoname(link, s2); 304 305 if (n) 306 fprintf(f, "dev %s ", n); 307 else 308 fprintf(f, "dev %u ", link); 309 } 310 311 if (flags & IP6_TNL_F_IGN_ENCAP_LIMIT) 312 printf("encaplimit none "); 313 else if (tb[IFLA_IPTUN_ENCAP_LIMIT]) 314 fprintf(f, "encaplimit %u ", 315 rta_getattr_u8(tb[IFLA_IPTUN_ENCAP_LIMIT])); 316 317 if (tb[IFLA_IPTUN_TTL]) 318 fprintf(f, "hoplimit %u ", rta_getattr_u8(tb[IFLA_IPTUN_TTL])); 319 320 if (flags & IP6_TNL_F_USE_ORIG_TCLASS) 321 printf("tclass inherit "); 322 else if (tb[IFLA_IPTUN_FLOWINFO]) { 323 __u32 val = ntohl(flowinfo & IP6_FLOWINFO_TCLASS); 324 325 printf("tclass 0x%02x ", (__u8)(val >> 20)); 326 } 327 328 if (flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) 329 printf("flowlabel inherit "); 330 else 331 printf("flowlabel 0x%05x ", ntohl(flowinfo & IP6_FLOWINFO_FLOWLABEL)); 332 333 printf("(flowinfo 0x%08x) ", ntohl(flowinfo)); 334 335 if (flags & IP6_TNL_F_RCV_DSCP_COPY) 336 printf("dscp inherit "); 337 338 if (flags & IP6_TNL_F_MIP6_DEV) 339 fprintf(f, "mip6 "); 340 341 if (flags & IP6_TNL_F_USE_ORIG_FWMARK) 342 fprintf(f, "fwmark inherit "); 343 } 344 345 static void ip6tunnel_print_help(struct link_util *lu, int argc, char **argv, 346 FILE *f) 347 { 348 print_usage(f); 349 } 350 351 struct link_util ip6tnl_link_util = { 352 .id = "ip6tnl", 353 .maxattr = IFLA_IPTUN_MAX, 354 .parse_opt = ip6tunnel_parse_opt, 355 .print_opt = ip6tunnel_print_opt, 356 .print_help = ip6tunnel_print_help, 357 }; 358
