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2f7fbec2 SK |
1 | /* |
2 | * link_vti6.c VTI 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: Herbert Xu <herbert@gondor.apana.org.au> | |
10 | * Saurabh Mohan <saurabh.mohan@vyatta.com> Modified link_gre.c for VTI | |
11 | * Steffen Klassert <steffen.klassert@secunet.com> Modified link_vti.c for IPv6 | |
12 | */ | |
13 | ||
14 | #include <string.h> | |
15 | #include <net/if.h> | |
16 | #include <sys/types.h> | |
17 | #include <sys/socket.h> | |
18 | #include <arpa/inet.h> | |
19 | ||
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 | ||
28 | static void usage(void) __attribute__((noreturn)); | |
29 | static void usage(void) | |
30 | { | |
31 | fprintf(stderr, "Usage: ip link { add | set | change | replace | del } NAME\n"); | |
32 | fprintf(stderr, " type { vti6 } [ remote ADDR ] [ local ADDR ]\n"); | |
33 | fprintf(stderr, " [ [i|o]key KEY ]\n"); | |
34 | fprintf(stderr, " [ dev PHYS_DEV ]\n"); | |
35 | fprintf(stderr, "\n"); | |
36 | fprintf(stderr, "Where: NAME := STRING\n"); | |
37 | fprintf(stderr, " ADDR := { IPV6_ADDRESS }\n"); | |
38 | fprintf(stderr, " KEY := { DOTTED_QUAD | NUMBER }\n"); | |
39 | exit(-1); | |
40 | } | |
41 | ||
42 | static int vti6_parse_opt(struct link_util *lu, int argc, char **argv, | |
43 | struct nlmsghdr *n) | |
44 | { | |
45 | struct { | |
46 | struct nlmsghdr n; | |
47 | struct ifinfomsg i; | |
48 | char buf[1024]; | |
49 | } req; | |
50 | struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1); | |
51 | struct rtattr *tb[IFLA_MAX + 1]; | |
52 | struct rtattr *linkinfo[IFLA_INFO_MAX+1]; | |
53 | struct rtattr *vtiinfo[IFLA_VTI_MAX + 1]; | |
54 | struct in6_addr saddr; | |
55 | struct in6_addr daddr; | |
56f5daac SH |
56 | unsigned int ikey = 0; |
57 | unsigned int okey = 0; | |
58 | unsigned int link = 0; | |
2f7fbec2 SK |
59 | int len; |
60 | ||
61 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { | |
62 | memset(&req, 0, sizeof(req)); | |
63 | ||
64 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)); | |
65 | req.n.nlmsg_flags = NLM_F_REQUEST; | |
66 | req.n.nlmsg_type = RTM_GETLINK; | |
67 | req.i.ifi_family = preferred_family; | |
68 | req.i.ifi_index = ifi->ifi_index; | |
69 | ||
c079e121 | 70 | if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0) { |
2f7fbec2 SK |
71 | get_failed: |
72 | fprintf(stderr, | |
73 | "Failed to get existing tunnel info.\n"); | |
74 | return -1; | |
75 | } | |
76 | ||
77 | len = req.n.nlmsg_len; | |
78 | len -= NLMSG_LENGTH(sizeof(*ifi)); | |
79 | if (len < 0) | |
80 | goto get_failed; | |
81 | ||
82 | parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len); | |
83 | ||
84 | if (!tb[IFLA_LINKINFO]) | |
85 | goto get_failed; | |
86 | ||
87 | parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]); | |
88 | ||
89 | if (!linkinfo[IFLA_INFO_DATA]) | |
90 | goto get_failed; | |
91 | ||
92 | parse_rtattr_nested(vtiinfo, IFLA_VTI_MAX, | |
93 | linkinfo[IFLA_INFO_DATA]); | |
94 | ||
95 | if (vtiinfo[IFLA_VTI_IKEY]) | |
96 | ikey = rta_getattr_u32(vtiinfo[IFLA_VTI_IKEY]); | |
97 | ||
98 | if (vtiinfo[IFLA_VTI_OKEY]) | |
99 | okey = rta_getattr_u32(vtiinfo[IFLA_VTI_OKEY]); | |
100 | ||
101 | if (vtiinfo[IFLA_VTI_LOCAL]) | |
102 | memcpy(&saddr, RTA_DATA(vtiinfo[IFLA_VTI_LOCAL]), sizeof(saddr)); | |
103 | ||
104 | if (vtiinfo[IFLA_VTI_REMOTE]) | |
105 | memcpy(&daddr, RTA_DATA(vtiinfo[IFLA_VTI_REMOTE]), sizeof(daddr)); | |
106 | ||
107 | if (vtiinfo[IFLA_VTI_LINK]) | |
108 | link = rta_getattr_u8(vtiinfo[IFLA_VTI_LINK]); | |
109 | } | |
110 | ||
111 | while (argc > 0) { | |
112 | if (!matches(*argv, "key")) { | |
56f5daac | 113 | unsigned int uval; |
2f7fbec2 SK |
114 | |
115 | NEXT_ARG(); | |
116 | if (strchr(*argv, '.')) | |
117 | uval = get_addr32(*argv); | |
118 | else { | |
119 | if (get_unsigned(&uval, *argv, 0) < 0) { | |
120 | fprintf(stderr, | |
121 | "Invalid value for \"key\": \"%s\"; it should be an unsigned integer\n", *argv); | |
122 | exit(-1); | |
123 | } | |
124 | uval = htonl(uval); | |
125 | } | |
126 | ||
127 | ikey = okey = uval; | |
128 | } else if (!matches(*argv, "ikey")) { | |
56f5daac | 129 | unsigned int uval; |
2f7fbec2 SK |
130 | |
131 | NEXT_ARG(); | |
132 | if (strchr(*argv, '.')) | |
133 | uval = get_addr32(*argv); | |
134 | else { | |
135 | if (get_unsigned(&uval, *argv, 0) < 0) { | |
136 | fprintf(stderr, "invalid value for \"ikey\": \"%s\"; it should be an unsigned integer\n", *argv); | |
137 | exit(-1); | |
138 | } | |
139 | uval = htonl(uval); | |
140 | } | |
141 | ikey = uval; | |
142 | } else if (!matches(*argv, "okey")) { | |
56f5daac | 143 | unsigned int uval; |
2f7fbec2 SK |
144 | |
145 | NEXT_ARG(); | |
146 | if (strchr(*argv, '.')) | |
147 | uval = get_addr32(*argv); | |
148 | else { | |
149 | if (get_unsigned(&uval, *argv, 0) < 0) { | |
150 | fprintf(stderr, "invalid value for \"okey\": \"%s\"; it should be an unsigned integer\n", *argv); | |
151 | exit(-1); | |
152 | } | |
153 | uval = htonl(uval); | |
154 | } | |
155 | okey = uval; | |
156 | } else if (!matches(*argv, "remote")) { | |
157 | NEXT_ARG(); | |
158 | if (!strcmp(*argv, "any")) { | |
159 | fprintf(stderr, "invalid value for \"remote\": \"%s\"\n", *argv); | |
160 | exit(-1); | |
161 | } else { | |
162 | inet_prefix addr; | |
56f5daac | 163 | |
2f7fbec2 SK |
164 | get_prefix(&addr, *argv, AF_INET6); |
165 | memcpy(&daddr, addr.data, addr.bytelen); | |
166 | } | |
167 | } else if (!matches(*argv, "local")) { | |
168 | NEXT_ARG(); | |
169 | if (!strcmp(*argv, "any")) { | |
170 | fprintf(stderr, "invalid value for \"local\": \"%s\"\n", *argv); | |
171 | exit(-1); | |
172 | } else { | |
173 | inet_prefix addr; | |
56f5daac | 174 | |
2f7fbec2 SK |
175 | get_prefix(&addr, *argv, AF_INET6); |
176 | memcpy(&saddr, addr.data, addr.bytelen); | |
177 | } | |
178 | } else if (!matches(*argv, "dev")) { | |
179 | NEXT_ARG(); | |
180 | link = if_nametoindex(*argv); | |
181 | if (link == 0) | |
182 | exit(-1); | |
183 | } else | |
184 | usage(); | |
185 | argc--; argv++; | |
186 | } | |
187 | ||
188 | addattr32(n, 1024, IFLA_VTI_IKEY, ikey); | |
189 | addattr32(n, 1024, IFLA_VTI_OKEY, okey); | |
190 | addattr_l(n, 1024, IFLA_VTI_LOCAL, &saddr, sizeof(saddr)); | |
191 | addattr_l(n, 1024, IFLA_VTI_REMOTE, &daddr, sizeof(daddr)); | |
192 | if (link) | |
193 | addattr32(n, 1024, IFLA_VTI_LINK, link); | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static void vti6_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]) | |
199 | { | |
2f7fbec2 SK |
200 | char s2[64]; |
201 | const char *local = "any"; | |
202 | const char *remote = "any"; | |
203 | struct in6_addr saddr; | |
204 | struct in6_addr daddr; | |
205 | ||
206 | if (!tb) | |
207 | return; | |
208 | ||
209 | if (tb[IFLA_VTI_REMOTE]) { | |
210 | memcpy(&daddr, RTA_DATA(tb[IFLA_VTI_REMOTE]), sizeof(daddr)); | |
211 | ||
a418e451 | 212 | remote = format_host(AF_INET6, 16, &daddr); |
2f7fbec2 SK |
213 | } |
214 | ||
215 | fprintf(f, "remote %s ", remote); | |
216 | ||
217 | if (tb[IFLA_VTI_LOCAL]) { | |
218 | memcpy(&saddr, RTA_DATA(tb[IFLA_VTI_LOCAL]), sizeof(saddr)); | |
219 | ||
a418e451 | 220 | local = format_host(AF_INET6, 16, &saddr); |
2f7fbec2 SK |
221 | } |
222 | ||
223 | fprintf(f, "local %s ", local); | |
224 | ||
225 | if (tb[IFLA_VTI_LINK] && *(__u32 *)RTA_DATA(tb[IFLA_VTI_LINK])) { | |
56f5daac | 226 | unsigned int link = *(__u32 *)RTA_DATA(tb[IFLA_VTI_LINK]); |
2f7fbec2 SK |
227 | const char *n = if_indextoname(link, s2); |
228 | ||
229 | if (n) | |
230 | fprintf(f, "dev %s ", n); | |
231 | else | |
232 | fprintf(f, "dev %u ", link); | |
233 | } | |
234 | ||
235 | if (tb[IFLA_VTI_IKEY]) { | |
236 | inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_IKEY]), s2, sizeof(s2)); | |
237 | fprintf(f, "ikey %s ", s2); | |
238 | } | |
239 | ||
240 | if (tb[IFLA_VTI_OKEY]) { | |
241 | inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_OKEY]), s2, sizeof(s2)); | |
242 | fprintf(f, "okey %s ", s2); | |
243 | } | |
244 | } | |
245 | ||
246 | struct link_util vti6_link_util = { | |
247 | .id = "vti6", | |
248 | .maxattr = IFLA_VTI_MAX, | |
249 | .parse_opt = vti6_parse_opt, | |
250 | .print_opt = vti6_print_opt, | |
251 | }; |