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9d0efc10 ND |
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@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 | ||
561e650e | 32 | static void print_usage(FILE *f) |
9d0efc10 | 33 | { |
561e650e | 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", | |
9d0efc10 | 44 | IPV6_DEFAULT_TNL_ENCAP_LIMIT); |
561e650e | 45 | fprintf(f, " HLIM := 0..255 (default=%d)\n", |
9d0efc10 | 46 | DEFAULT_TNL_HOP_LIMIT); |
561e650e | 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); | |
9d0efc10 ND |
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 | ||
c079e121 | 92 | if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0) { |
9d0efc10 ND |
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, | |
26dcdf3a | 288 | RTA_PAYLOAD(tb[IFLA_IPTUN_REMOTE]), |
9d0efc10 ND |
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, | |
26dcdf3a | 296 | RTA_PAYLOAD(tb[IFLA_IPTUN_LOCAL]), |
9d0efc10 ND |
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 | ||
561e650e | 345 | static void ip6tunnel_print_help(struct link_util *lu, int argc, char **argv, |
346 | FILE *f) | |
347 | { | |
348 | print_usage(f); | |
349 | } | |
350 | ||
9d0efc10 ND |
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, | |
561e650e | 356 | .print_help = ip6tunnel_print_help, |
9d0efc10 | 357 | }; |