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