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));
usage(void)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
vti6_parse_opt(struct link_util * lu,int argc,char ** argv,struct nlmsghdr * n)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;
56 unsigned ikey = 0;
57 unsigned okey = 0;
58 unsigned link = 0;
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
70 if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0) {
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")) {
113 unsigned uval;
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")) {
129 unsigned uval;
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")) {
143 unsigned uval;
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;
163 get_prefix(&addr, *argv, AF_INET6);
164 memcpy(&daddr, addr.data, addr.bytelen);
165 }
166 } else if (!matches(*argv, "local")) {
167 NEXT_ARG();
168 if (!strcmp(*argv, "any")) {
169 fprintf(stderr, "invalid value for \"local\": \"%s\"\n", *argv);
170 exit(-1);
171 } else {
172 inet_prefix addr;
173 get_prefix(&addr, *argv, AF_INET6);
174 memcpy(&saddr, addr.data, addr.bytelen);
175 }
176 } else if (!matches(*argv, "dev")) {
177 NEXT_ARG();
178 link = if_nametoindex(*argv);
179 if (link == 0)
180 exit(-1);
181 } else
182 usage();
183 argc--; argv++;
184 }
185
186 addattr32(n, 1024, IFLA_VTI_IKEY, ikey);
187 addattr32(n, 1024, IFLA_VTI_OKEY, okey);
188 addattr_l(n, 1024, IFLA_VTI_LOCAL, &saddr, sizeof(saddr));
189 addattr_l(n, 1024, IFLA_VTI_REMOTE, &daddr, sizeof(daddr));
190 if (link)
191 addattr32(n, 1024, IFLA_VTI_LINK, link);
192
193 return 0;
194 }
195
vti6_print_opt(struct link_util * lu,FILE * f,struct rtattr * tb[])196 static void vti6_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
197 {
198 char s1[1024];
199 char s2[64];
200 const char *local = "any";
201 const char *remote = "any";
202 struct in6_addr saddr;
203 struct in6_addr daddr;
204
205 if (!tb)
206 return;
207
208 if (tb[IFLA_VTI_REMOTE]) {
209 memcpy(&daddr, RTA_DATA(tb[IFLA_VTI_REMOTE]), sizeof(daddr));
210
211 remote = format_host(AF_INET6, 16, &daddr, s1, sizeof(s1));
212 }
213
214 fprintf(f, "remote %s ", remote);
215
216 if (tb[IFLA_VTI_LOCAL]) {
217 memcpy(&saddr, RTA_DATA(tb[IFLA_VTI_LOCAL]), sizeof(saddr));
218
219 local = format_host(AF_INET6, 16, &saddr, s1, sizeof(s1));
220 }
221
222 fprintf(f, "local %s ", local);
223
224 if (tb[IFLA_VTI_LINK] && *(__u32 *)RTA_DATA(tb[IFLA_VTI_LINK])) {
225 unsigned link = *(__u32 *)RTA_DATA(tb[IFLA_VTI_LINK]);
226 const char *n = if_indextoname(link, s2);
227
228 if (n)
229 fprintf(f, "dev %s ", n);
230 else
231 fprintf(f, "dev %u ", link);
232 }
233
234 if (tb[IFLA_VTI_IKEY]) {
235 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_IKEY]), s2, sizeof(s2));
236 fprintf(f, "ikey %s ", s2);
237 }
238
239 if (tb[IFLA_VTI_OKEY]) {
240 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_OKEY]), s2, sizeof(s2));
241 fprintf(f, "okey %s ", s2);
242 }
243 }
244
245 struct link_util vti6_link_util = {
246 .id = "vti6",
247 .maxattr = IFLA_VTI_MAX,
248 .parse_opt = vti6_parse_opt,
249 .print_opt = vti6_print_opt,
250 };
251