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93863328 DL |
1 | /* |
2 | * seg6.c "ip sr/seg6" | |
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 | * version 2 as published by the Free Software Foundation; | |
7 | * | |
8 | * Author: David Lebrun <david.lebrun@uclouvain.be> | |
9 | */ | |
10 | ||
11 | #include <stdio.h> | |
12 | #include <stdlib.h> | |
13 | #include <string.h> | |
14 | #include <unistd.h> | |
15 | #include <errno.h> | |
16 | #include <sys/types.h> | |
17 | #include <sys/socket.h> | |
18 | #include <arpa/inet.h> | |
19 | #include <sys/ioctl.h> | |
20 | #include <linux/if.h> | |
21 | ||
22 | #include <linux/genetlink.h> | |
23 | #include <linux/seg6_genl.h> | |
24 | #include <linux/seg6_hmac.h> | |
25 | ||
26 | #include "utils.h" | |
27 | #include "ip_common.h" | |
28 | #include "libgenl.h" | |
111f79ad | 29 | #include "json_print.h" |
93863328 DL |
30 | |
31 | #define HMAC_KEY_PROMPT "Enter secret for HMAC key ID (blank to delete): " | |
32 | ||
33 | static void usage(void) | |
34 | { | |
35 | fprintf(stderr, "Usage: ip sr { COMMAND | help }\n"); | |
36 | fprintf(stderr, " ip sr hmac show\n"); | |
37 | fprintf(stderr, " ip sr hmac set KEYID ALGO\n"); | |
38 | fprintf(stderr, " ip sr tunsrc show\n"); | |
39 | fprintf(stderr, " ip sr tunsrc set ADDRESS\n"); | |
40 | fprintf(stderr, "where ALGO := { sha1 | sha256 }\n"); | |
41 | exit(-1); | |
42 | } | |
43 | ||
44 | static struct rtnl_handle grth = { .fd = -1 }; | |
45 | static int genl_family = -1; | |
46 | ||
47 | #define SEG6_REQUEST(_req, _bufsiz, _cmd, _flags) \ | |
48 | GENL_REQUEST(_req, _bufsiz, genl_family, 0, \ | |
49 | SEG6_GENL_VERSION, _cmd, _flags) | |
50 | ||
51 | static struct { | |
52 | unsigned int cmd; | |
6caad8f5 | 53 | inet_prefix addr; |
93863328 DL |
54 | __u32 keyid; |
55 | const char *pass; | |
56 | __u8 alg_id; | |
57 | } opts; | |
58 | ||
111f79ad SH |
59 | static void print_dumphmac(struct rtattr *attrs[]) |
60 | { | |
61 | char secret[64]; | |
62 | char *algstr; | |
63 | __u8 slen = rta_getattr_u8(attrs[SEG6_ATTR_SECRETLEN]); | |
64 | __u8 alg_id = rta_getattr_u8(attrs[SEG6_ATTR_ALGID]); | |
65 | ||
66 | memset(secret, 0, 64); | |
67 | ||
68 | if (slen > 63) { | |
69 | fprintf(stderr, "HMAC secret length %d > 63, truncated\n", slen); | |
70 | slen = 63; | |
71 | } | |
72 | ||
73 | memcpy(secret, RTA_DATA(attrs[SEG6_ATTR_SECRET]), slen); | |
74 | ||
75 | switch (alg_id) { | |
76 | case SEG6_HMAC_ALGO_SHA1: | |
77 | algstr = "sha1"; | |
78 | break; | |
79 | case SEG6_HMAC_ALGO_SHA256: | |
80 | algstr = "sha256"; | |
81 | break; | |
82 | default: | |
83 | algstr = "<unknown>"; | |
84 | } | |
85 | ||
86 | print_uint(PRINT_ANY, "hmac", "hmac %u ", | |
87 | rta_getattr_u32(attrs[SEG6_ATTR_HMACKEYID])); | |
88 | print_string(PRINT_ANY, "algo", "algo %s ", algstr); | |
89 | print_string(PRINT_ANY, "secret", "secret \"%s\"\n", secret); | |
90 | } | |
91 | ||
92 | static void print_tunsrc(struct rtattr *attrs[]) | |
93 | { | |
94 | const char *dst | |
95 | = rt_addr_n2a(AF_INET6, 16, | |
96 | RTA_DATA(attrs[SEG6_ATTR_DST])); | |
97 | ||
98 | print_string(PRINT_ANY, "tunsrc", | |
99 | "tunsrc addr %s\n", dst); | |
100 | } | |
101 | ||
cd554f2c | 102 | static int process_msg(struct nlmsghdr *n, void *arg) |
93863328 DL |
103 | { |
104 | struct rtattr *attrs[SEG6_ATTR_MAX + 1]; | |
105 | struct genlmsghdr *ghdr; | |
93863328 DL |
106 | int len = n->nlmsg_len; |
107 | ||
108 | if (n->nlmsg_type != genl_family) | |
109 | return -1; | |
110 | ||
111 | len -= NLMSG_LENGTH(GENL_HDRLEN); | |
112 | if (len < 0) | |
113 | return -1; | |
114 | ||
115 | ghdr = NLMSG_DATA(n); | |
116 | ||
117 | parse_rtattr(attrs, SEG6_ATTR_MAX, (void *)ghdr + GENL_HDRLEN, len); | |
118 | ||
111f79ad | 119 | open_json_object(NULL); |
93863328 DL |
120 | switch (ghdr->cmd) { |
121 | case SEG6_CMD_DUMPHMAC: | |
111f79ad | 122 | print_dumphmac(attrs); |
93863328 | 123 | break; |
111f79ad | 124 | |
93863328 | 125 | case SEG6_CMD_GET_TUNSRC: |
111f79ad | 126 | print_tunsrc(attrs); |
93863328 DL |
127 | break; |
128 | } | |
111f79ad | 129 | close_json_object(); |
93863328 DL |
130 | |
131 | return 0; | |
132 | } | |
133 | ||
134 | static int seg6_do_cmd(void) | |
135 | { | |
136 | SEG6_REQUEST(req, 1024, opts.cmd, NLM_F_REQUEST); | |
86bf43c7 | 137 | struct nlmsghdr *answer; |
93863328 DL |
138 | int repl = 0, dump = 0; |
139 | ||
140 | if (genl_family < 0) { | |
141 | if (rtnl_open_byproto(&grth, 0, NETLINK_GENERIC) < 0) { | |
142 | fprintf(stderr, "Cannot open generic netlink socket\n"); | |
143 | exit(1); | |
144 | } | |
145 | genl_family = genl_resolve_family(&grth, SEG6_GENL_NAME); | |
146 | if (genl_family < 0) | |
147 | exit(1); | |
148 | req.n.nlmsg_type = genl_family; | |
149 | } | |
150 | ||
151 | switch (opts.cmd) { | |
152 | case SEG6_CMD_SETHMAC: | |
153 | { | |
154 | addattr32(&req.n, sizeof(req), SEG6_ATTR_HMACKEYID, opts.keyid); | |
155 | addattr8(&req.n, sizeof(req), SEG6_ATTR_SECRETLEN, | |
156 | strlen(opts.pass)); | |
157 | addattr8(&req.n, sizeof(req), SEG6_ATTR_ALGID, opts.alg_id); | |
158 | if (strlen(opts.pass)) | |
159 | addattr_l(&req.n, sizeof(req), SEG6_ATTR_SECRET, | |
160 | opts.pass, strlen(opts.pass)); | |
161 | break; | |
162 | } | |
163 | case SEG6_CMD_SET_TUNSRC: | |
6caad8f5 | 164 | addattr_l(&req.n, sizeof(req), SEG6_ATTR_DST, opts.addr.data, |
93863328 DL |
165 | sizeof(struct in6_addr)); |
166 | break; | |
167 | case SEG6_CMD_DUMPHMAC: | |
168 | dump = 1; | |
169 | break; | |
170 | case SEG6_CMD_GET_TUNSRC: | |
171 | repl = 1; | |
172 | break; | |
173 | } | |
174 | ||
175 | if (!repl && !dump) { | |
86bf43c7 | 176 | if (rtnl_talk(&grth, &req.n, NULL) < 0) |
93863328 DL |
177 | return -1; |
178 | } else if (repl) { | |
86bf43c7 | 179 | if (rtnl_talk(&grth, &req.n, &answer) < 0) |
93863328 | 180 | return -2; |
111f79ad | 181 | new_json_obj(json); |
cd554f2c | 182 | if (process_msg(answer, stdout) < 0) { |
93863328 DL |
183 | fprintf(stderr, "Error parsing reply\n"); |
184 | exit(1); | |
185 | } | |
111f79ad | 186 | delete_json_obj(); |
86bf43c7 | 187 | free(answer); |
93863328 DL |
188 | } else { |
189 | req.n.nlmsg_flags |= NLM_F_DUMP; | |
190 | req.n.nlmsg_seq = grth.dump = ++grth.seq; | |
191 | if (rtnl_send(&grth, &req, req.n.nlmsg_len) < 0) { | |
192 | perror("Failed to send dump request"); | |
193 | exit(1); | |
194 | } | |
195 | ||
111f79ad | 196 | new_json_obj(json); |
93863328 DL |
197 | if (rtnl_dump_filter(&grth, process_msg, stdout) < 0) { |
198 | fprintf(stderr, "Dump terminated\n"); | |
199 | exit(1); | |
200 | } | |
111f79ad SH |
201 | delete_json_obj(); |
202 | fflush(stdout); | |
93863328 DL |
203 | } |
204 | ||
205 | return 0; | |
206 | } | |
207 | ||
208 | int do_seg6(int argc, char **argv) | |
209 | { | |
210 | if (argc < 1 || matches(*argv, "help") == 0) | |
211 | usage(); | |
212 | ||
213 | memset(&opts, 0, sizeof(opts)); | |
214 | ||
215 | if (matches(*argv, "hmac") == 0) { | |
216 | NEXT_ARG(); | |
217 | if (matches(*argv, "show") == 0) { | |
218 | opts.cmd = SEG6_CMD_DUMPHMAC; | |
219 | } else if (matches(*argv, "set") == 0) { | |
220 | NEXT_ARG(); | |
221 | if (get_u32(&opts.keyid, *argv, 0) || opts.keyid == 0) | |
222 | invarg("hmac KEYID value is invalid", *argv); | |
223 | NEXT_ARG(); | |
224 | if (strcmp(*argv, "sha1") == 0) { | |
225 | opts.alg_id = SEG6_HMAC_ALGO_SHA1; | |
226 | } else if (strcmp(*argv, "sha256") == 0) { | |
227 | opts.alg_id = SEG6_HMAC_ALGO_SHA256; | |
228 | } else { | |
229 | invarg("hmac ALGO value is invalid", *argv); | |
230 | } | |
231 | opts.cmd = SEG6_CMD_SETHMAC; | |
232 | opts.pass = getpass(HMAC_KEY_PROMPT); | |
233 | } else { | |
234 | invarg("unknown", *argv); | |
235 | } | |
236 | } else if (matches(*argv, "tunsrc") == 0) { | |
237 | NEXT_ARG(); | |
238 | if (matches(*argv, "show") == 0) { | |
239 | opts.cmd = SEG6_CMD_GET_TUNSRC; | |
240 | } else if (matches(*argv, "set") == 0) { | |
241 | NEXT_ARG(); | |
242 | opts.cmd = SEG6_CMD_SET_TUNSRC; | |
6caad8f5 | 243 | get_addr(&opts.addr, *argv, AF_INET6); |
93863328 DL |
244 | } else { |
245 | invarg("unknown", *argv); | |
246 | } | |
247 | } else { | |
248 | invarg("unknown", *argv); | |
249 | } | |
250 | ||
251 | return seg6_do_cmd(); | |
252 | } |