1 /*
2 * link_vti.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 */
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 "rt_names.h"
22 #include "utils.h"
23 #include "ip_common.h"
24 #include "tunnel.h"
25
26
print_usage(FILE * f)27 static void print_usage(FILE *f)
28 {
29 fprintf(f, "Usage: ip link { add | set | change | replace | del } NAME\n");
30 fprintf(f, " type { vti } [ remote ADDR ] [ local ADDR ]\n");
31 fprintf(f, " [ [i|o]key KEY ]\n");
32 fprintf(f, " [ dev PHYS_DEV ]\n");
33 fprintf(f, "\n");
34 fprintf(f, "Where: NAME := STRING\n");
35 fprintf(f, " ADDR := { IP_ADDRESS }\n");
36 fprintf(f, " KEY := { DOTTED_QUAD | NUMBER }\n");
37 }
38
39 static void usage(void) __attribute__((noreturn));
usage(void)40 static void usage(void)
41 {
42 print_usage(stderr);
43 exit(-1);
44 }
45
vti_parse_opt(struct link_util * lu,int argc,char ** argv,struct nlmsghdr * n)46 static int vti_parse_opt(struct link_util *lu, int argc, char **argv,
47 struct nlmsghdr *n)
48 {
49 struct {
50 struct nlmsghdr n;
51 struct ifinfomsg i;
52 char buf[1024];
53 } req;
54 struct ifinfomsg *ifi = (struct ifinfomsg *)(n + 1);
55 struct rtattr *tb[IFLA_MAX + 1];
56 struct rtattr *linkinfo[IFLA_INFO_MAX+1];
57 struct rtattr *vtiinfo[IFLA_VTI_MAX + 1];
58 unsigned ikey = 0;
59 unsigned okey = 0;
60 unsigned saddr = 0;
61 unsigned daddr = 0;
62 unsigned link = 0;
63 int len;
64
65 if (!(n->nlmsg_flags & NLM_F_CREATE)) {
66 memset(&req, 0, sizeof(req));
67
68 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi));
69 req.n.nlmsg_flags = NLM_F_REQUEST;
70 req.n.nlmsg_type = RTM_GETLINK;
71 req.i.ifi_family = preferred_family;
72 req.i.ifi_index = ifi->ifi_index;
73
74 if (rtnl_talk(&rth, &req.n, &req.n, sizeof(req)) < 0) {
75 get_failed:
76 fprintf(stderr,
77 "Failed to get existing tunnel info.\n");
78 return -1;
79 }
80
81 len = req.n.nlmsg_len;
82 len -= NLMSG_LENGTH(sizeof(*ifi));
83 if (len < 0)
84 goto get_failed;
85
86 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(&req.i), len);
87
88 if (!tb[IFLA_LINKINFO])
89 goto get_failed;
90
91 parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
92
93 if (!linkinfo[IFLA_INFO_DATA])
94 goto get_failed;
95
96 parse_rtattr_nested(vtiinfo, IFLA_VTI_MAX,
97 linkinfo[IFLA_INFO_DATA]);
98
99 if (vtiinfo[IFLA_VTI_IKEY])
100 ikey = *(__u32 *)RTA_DATA(vtiinfo[IFLA_VTI_IKEY]);
101
102 if (vtiinfo[IFLA_VTI_OKEY])
103 okey = *(__u32 *)RTA_DATA(vtiinfo[IFLA_VTI_OKEY]);
104
105 if (vtiinfo[IFLA_VTI_LOCAL])
106 saddr = *(__u32 *)RTA_DATA(vtiinfo[IFLA_VTI_LOCAL]);
107
108 if (vtiinfo[IFLA_VTI_REMOTE])
109 daddr = *(__u32 *)RTA_DATA(vtiinfo[IFLA_VTI_REMOTE]);
110
111 if (vtiinfo[IFLA_VTI_LINK])
112 link = *(__u8 *)RTA_DATA(vtiinfo[IFLA_VTI_LINK]);
113 }
114
115 while (argc > 0) {
116 if (!matches(*argv, "key")) {
117 unsigned uval;
118
119 NEXT_ARG();
120 if (strchr(*argv, '.'))
121 uval = get_addr32(*argv);
122 else {
123 if (get_unsigned(&uval, *argv, 0) < 0) {
124 fprintf(stderr,
125 "Invalid value for \"key\": \"%s\"; it should be an unsigned integer\n", *argv);
126 exit(-1);
127 }
128 uval = htonl(uval);
129 }
130
131 ikey = okey = uval;
132 } else if (!matches(*argv, "ikey")) {
133 unsigned uval;
134
135 NEXT_ARG();
136 if (strchr(*argv, '.'))
137 uval = get_addr32(*argv);
138 else {
139 if (get_unsigned(&uval, *argv, 0) < 0) {
140 fprintf(stderr, "invalid value for \"ikey\": \"%s\"; it should be an unsigned integer\n", *argv);
141 exit(-1);
142 }
143 uval = htonl(uval);
144 }
145 ikey = uval;
146 } else if (!matches(*argv, "okey")) {
147 unsigned uval;
148
149 NEXT_ARG();
150 if (strchr(*argv, '.'))
151 uval = get_addr32(*argv);
152 else {
153 if (get_unsigned(&uval, *argv, 0) < 0) {
154 fprintf(stderr, "invalid value for \"okey\": \"%s\"; it should be an unsigned integer\n", *argv);
155 exit(-1);
156 }
157 uval = htonl(uval);
158 }
159 okey = uval;
160 } else if (!matches(*argv, "remote")) {
161 NEXT_ARG();
162 if (!strcmp(*argv, "any")) {
163 fprintf(stderr, "invalid value for \"remote\": \"%s\"\n", *argv);
164 exit(-1);
165 } else {
166 daddr = get_addr32(*argv);
167 }
168 } else if (!matches(*argv, "local")) {
169 NEXT_ARG();
170 if (!strcmp(*argv, "any")) {
171 fprintf(stderr, "invalid value for \"local\": \"%s\"\n", *argv);
172 exit(-1);
173 } else {
174 saddr = get_addr32(*argv);
175 }
176 } else if (!matches(*argv, "dev")) {
177 NEXT_ARG();
178 link = if_nametoindex(*argv);
179 if (link == 0) {
180 fprintf(stderr, "Cannot find device \"%s\"\n",
181 *argv);
182 exit(-1);
183 }
184 } else
185 usage();
186 argc--; argv++;
187 }
188
189 addattr32(n, 1024, IFLA_VTI_IKEY, ikey);
190 addattr32(n, 1024, IFLA_VTI_OKEY, okey);
191 addattr_l(n, 1024, IFLA_VTI_LOCAL, &saddr, 4);
192 addattr_l(n, 1024, IFLA_VTI_REMOTE, &daddr, 4);
193 if (link)
194 addattr32(n, 1024, IFLA_VTI_LINK, link);
195
196 return 0;
197 }
198
vti_print_opt(struct link_util * lu,FILE * f,struct rtattr * tb[])199 static void vti_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
200 {
201 char s1[1024];
202 char s2[64];
203 const char *local = "any";
204 const char *remote = "any";
205
206 if (!tb)
207 return;
208
209 if (tb[IFLA_VTI_REMOTE]) {
210 unsigned addr = *(__u32 *)RTA_DATA(tb[IFLA_VTI_REMOTE]);
211
212 if (addr)
213 remote = format_host(AF_INET, 4, &addr, s1, sizeof(s1));
214 }
215
216 fprintf(f, "remote %s ", remote);
217
218 if (tb[IFLA_VTI_LOCAL]) {
219 unsigned addr = *(__u32 *)RTA_DATA(tb[IFLA_VTI_LOCAL]);
220
221 if (addr)
222 local = format_host(AF_INET, 4, &addr, s1, sizeof(s1));
223 }
224
225 fprintf(f, "local %s ", local);
226
227 if (tb[IFLA_VTI_LINK] && *(__u32 *)RTA_DATA(tb[IFLA_VTI_LINK])) {
228 unsigned link = *(__u32 *)RTA_DATA(tb[IFLA_VTI_LINK]);
229 const char *n = if_indextoname(link, s2);
230
231 if (n)
232 fprintf(f, "dev %s ", n);
233 else
234 fprintf(f, "dev %u ", link);
235 }
236
237 if (tb[IFLA_VTI_IKEY]) {
238 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_IKEY]), s2, sizeof(s2));
239 fprintf(f, "ikey %s ", s2);
240 }
241
242 if (tb[IFLA_VTI_OKEY]) {
243 inet_ntop(AF_INET, RTA_DATA(tb[IFLA_VTI_OKEY]), s2, sizeof(s2));
244 fprintf(f, "okey %s ", s2);
245 }
246 }
247
vti_print_help(struct link_util * lu,int argc,char ** argv,FILE * f)248 static void vti_print_help(struct link_util *lu, int argc, char **argv,
249 FILE *f)
250 {
251 print_usage(f);
252 }
253
254 struct link_util vti_link_util = {
255 .id = "vti",
256 .maxattr = IFLA_VTI_MAX,
257 .parse_opt = vti_parse_opt,
258 .print_opt = vti_print_opt,
259 .print_help = vti_print_help,
260 };
261