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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 | static void vti6_print_help(struct link_util *lu, int argc, char **argv, | |
28 | FILE *f) | |
29 | { | |
30 | fprintf(f, | |
31 | "Usage: ... %-4s [ remote ADDR ]\n", | |
32 | lu->id | |
33 | ); | |
34 | fprintf(f, | |
35 | " [ local ADDR ]\n" | |
36 | " [ [i|o]key KEY ]\n" | |
37 | " [ dev PHYS_DEV ]\n" | |
38 | " [ fwmark MARK ]\n" | |
39 | "\n" | |
40 | ); | |
41 | fprintf(f, | |
42 | "Where: ADDR := { IP%s_ADDRESS }\n" | |
43 | " KEY := { DOTTED_QUAD | NUMBER }\n" | |
44 | " MARK := { 0x0..0xffffffff }\n", | |
45 | "V6" | |
46 | ); | |
47 | } | |
48 | ||
49 | static int vti6_parse_opt(struct link_util *lu, int argc, char **argv, | |
50 | struct nlmsghdr *n) | |
51 | { | |
52 | struct ifinfomsg *ifi = NLMSG_DATA(n); | |
53 | struct { | |
54 | struct nlmsghdr n; | |
55 | struct ifinfomsg i; | |
56 | } req = { | |
57 | .n.nlmsg_len = NLMSG_LENGTH(sizeof(*ifi)), | |
58 | .n.nlmsg_flags = NLM_F_REQUEST, | |
59 | .n.nlmsg_type = RTM_GETLINK, | |
60 | .i.ifi_family = preferred_family, | |
61 | .i.ifi_index = ifi->ifi_index, | |
62 | }; | |
63 | struct nlmsghdr *answer; | |
64 | struct rtattr *tb[IFLA_MAX + 1]; | |
65 | struct rtattr *linkinfo[IFLA_INFO_MAX+1]; | |
66 | struct rtattr *vtiinfo[IFLA_VTI_MAX + 1]; | |
67 | __be32 ikey = 0; | |
68 | __be32 okey = 0; | |
69 | inet_prefix saddr, daddr; | |
70 | unsigned int link = 0; | |
71 | __u32 fwmark = 0; | |
72 | int len; | |
73 | ||
74 | inet_prefix_reset(&saddr); | |
75 | inet_prefix_reset(&daddr); | |
76 | ||
77 | if (!(n->nlmsg_flags & NLM_F_CREATE)) { | |
78 | const struct rtattr *rta; | |
79 | ||
80 | if (rtnl_talk(&rth, &req.n, &answer) < 0) { | |
81 | get_failed: | |
82 | fprintf(stderr, | |
83 | "Failed to get existing tunnel info.\n"); | |
84 | return -1; | |
85 | } | |
86 | ||
87 | len = answer->nlmsg_len; | |
88 | len -= NLMSG_LENGTH(sizeof(*ifi)); | |
89 | if (len < 0) | |
90 | goto get_failed; | |
91 | ||
92 | parse_rtattr(tb, IFLA_MAX, IFLA_RTA(NLMSG_DATA(answer)), len); | |
93 | ||
94 | if (!tb[IFLA_LINKINFO]) | |
95 | goto get_failed; | |
96 | ||
97 | parse_rtattr_nested(linkinfo, IFLA_INFO_MAX, tb[IFLA_LINKINFO]); | |
98 | ||
99 | if (!linkinfo[IFLA_INFO_DATA]) | |
100 | goto get_failed; | |
101 | ||
102 | parse_rtattr_nested(vtiinfo, IFLA_VTI_MAX, | |
103 | linkinfo[IFLA_INFO_DATA]); | |
104 | ||
105 | rta = vtiinfo[IFLA_VTI_LOCAL]; | |
106 | if (rta && get_addr_rta(&saddr, rta, AF_INET6)) | |
107 | goto get_failed; | |
108 | ||
109 | rta = vtiinfo[IFLA_VTI_REMOTE]; | |
110 | if (rta && get_addr_rta(&daddr, rta, AF_INET6)) | |
111 | goto get_failed; | |
112 | ||
113 | if (vtiinfo[IFLA_VTI_IKEY]) | |
114 | ikey = rta_getattr_u32(vtiinfo[IFLA_VTI_IKEY]); | |
115 | ||
116 | if (vtiinfo[IFLA_VTI_OKEY]) | |
117 | okey = rta_getattr_u32(vtiinfo[IFLA_VTI_OKEY]); | |
118 | ||
119 | if (vtiinfo[IFLA_VTI_LINK]) | |
120 | link = rta_getattr_u8(vtiinfo[IFLA_VTI_LINK]); | |
121 | ||
122 | if (vtiinfo[IFLA_VTI_FWMARK]) | |
123 | fwmark = rta_getattr_u32(vtiinfo[IFLA_VTI_FWMARK]); | |
124 | ||
125 | free(answer); | |
126 | } | |
127 | ||
128 | while (argc > 0) { | |
129 | if (!matches(*argv, "key")) { | |
130 | NEXT_ARG(); | |
131 | ikey = okey = tnl_parse_key("key", *argv); | |
132 | } else if (!matches(*argv, "ikey")) { | |
133 | NEXT_ARG(); | |
134 | ikey = tnl_parse_key("ikey", *argv); | |
135 | } else if (!matches(*argv, "okey")) { | |
136 | NEXT_ARG(); | |
137 | okey = tnl_parse_key("okey", *argv); | |
138 | } else if (!matches(*argv, "remote")) { | |
139 | NEXT_ARG(); | |
140 | get_addr(&daddr, *argv, AF_INET6); | |
141 | } else if (!matches(*argv, "local")) { | |
142 | NEXT_ARG(); | |
143 | get_addr(&saddr, *argv, AF_INET6); | |
144 | } else if (!matches(*argv, "dev")) { | |
145 | NEXT_ARG(); | |
146 | link = ll_name_to_index(*argv); | |
147 | if (!link) | |
148 | exit(nodev(*argv)); | |
149 | } else if (strcmp(*argv, "fwmark") == 0) { | |
150 | NEXT_ARG(); | |
151 | if (get_u32(&fwmark, *argv, 0)) | |
152 | invarg("invalid fwmark\n", *argv); | |
153 | } else { | |
154 | vti6_print_help(lu, argc, argv, stderr); | |
155 | return -1; | |
156 | } | |
157 | argc--; argv++; | |
158 | } | |
159 | ||
160 | addattr32(n, 1024, IFLA_VTI_IKEY, ikey); | |
161 | addattr32(n, 1024, IFLA_VTI_OKEY, okey); | |
162 | if (is_addrtype_inet_not_unspec(&saddr)) | |
163 | addattr_l(n, 1024, IFLA_VTI_LOCAL, saddr.data, saddr.bytelen); | |
164 | if (is_addrtype_inet_not_unspec(&daddr)) | |
165 | addattr_l(n, 1024, IFLA_VTI_REMOTE, daddr.data, daddr.bytelen); | |
166 | addattr32(n, 1024, IFLA_VTI_FWMARK, fwmark); | |
167 | if (link) | |
168 | addattr32(n, 1024, IFLA_VTI_LINK, link); | |
169 | ||
170 | return 0; | |
171 | } | |
172 | ||
173 | static void vti6_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]) | |
174 | { | |
175 | char s2[64]; | |
176 | ||
177 | if (!tb) | |
178 | return; | |
179 | ||
180 | tnl_print_endpoint("remote", tb[IFLA_VTI_REMOTE], AF_INET6); | |
181 | tnl_print_endpoint("local", tb[IFLA_VTI_LOCAL], AF_INET6); | |
182 | ||
183 | if (tb[IFLA_VTI_LINK]) { | |
184 | __u32 link = rta_getattr_u32(tb[IFLA_VTI_LINK]); | |
185 | ||
186 | if (link) { | |
187 | print_string(PRINT_ANY, "link", "dev %s ", | |
188 | ll_index_to_name(link)); | |
189 | } | |
190 | } | |
191 | ||
192 | if (tb[IFLA_VTI_IKEY]) { | |
193 | struct rtattr *rta = tb[IFLA_VTI_IKEY]; | |
194 | __u32 key = rta_getattr_u32(rta); | |
195 | ||
196 | if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2))) | |
197 | print_string(PRINT_ANY, "ikey", "ikey %s ", s2); | |
198 | } | |
199 | ||
200 | if (tb[IFLA_VTI_OKEY]) { | |
201 | struct rtattr *rta = tb[IFLA_VTI_OKEY]; | |
202 | __u32 key = rta_getattr_u32(rta); | |
203 | ||
204 | if (key && inet_ntop(AF_INET, RTA_DATA(rta), s2, sizeof(s2))) | |
205 | print_string(PRINT_ANY, "okey", "okey %s ", s2); | |
206 | } | |
207 | ||
208 | if (tb[IFLA_VTI_FWMARK]) { | |
209 | __u32 fwmark = rta_getattr_u32(tb[IFLA_VTI_FWMARK]); | |
210 | ||
211 | if (fwmark) { | |
212 | print_0xhex(PRINT_ANY, | |
213 | "fwmark", "fwmark 0x%x ", fwmark); | |
214 | } | |
215 | } | |
216 | } | |
217 | ||
218 | struct link_util vti6_link_util = { | |
219 | .id = "vti6", | |
220 | .maxattr = IFLA_VTI_MAX, | |
221 | .parse_opt = vti6_parse_opt, | |
222 | .print_opt = vti6_print_opt, | |
223 | .print_help = vti6_print_help, | |
224 | }; |