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1 | /* | |
2 | * ip.c "ip" utility frontend. | |
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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
10 | */ | |
11 | ||
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
14 | #include <unistd.h> | |
15 | #include <fcntl.h> | |
16 | #include <sys/socket.h> | |
17 | #include <netinet/in.h> | |
18 | #include <string.h> | |
19 | #include <errno.h> | |
20 | ||
21 | #include "version.h" | |
22 | #include "utils.h" | |
23 | #include "ip_common.h" | |
24 | #include "namespace.h" | |
25 | #include "color.h" | |
26 | #include "rt_names.h" | |
27 | #include "bpf_util.h" | |
28 | ||
29 | #ifndef LIBDIR | |
30 | #define LIBDIR "/usr/lib" | |
31 | #endif | |
32 | ||
33 | int preferred_family = AF_UNSPEC; | |
34 | int human_readable; | |
35 | int use_iec; | |
36 | int show_stats; | |
37 | int show_details; | |
38 | int oneline; | |
39 | int brief; | |
40 | int json; | |
41 | int timestamp; | |
42 | int force; | |
43 | int max_flush_loops = 10; | |
44 | int batch_mode; | |
45 | bool do_all; | |
46 | ||
47 | struct rtnl_handle rth = { .fd = -1 }; | |
48 | ||
49 | const char *get_ip_lib_dir(void) | |
50 | { | |
51 | const char *lib_dir; | |
52 | ||
53 | lib_dir = getenv("IP_LIB_DIR"); | |
54 | if (!lib_dir) | |
55 | lib_dir = LIBDIR "/ip"; | |
56 | ||
57 | return lib_dir; | |
58 | } | |
59 | ||
60 | static void usage(void) __attribute__((noreturn)); | |
61 | ||
62 | static void usage(void) | |
63 | { | |
64 | fprintf(stderr, | |
65 | "Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }\n" | |
66 | " ip [ -force ] -batch filename\n" | |
67 | "where OBJECT := { link | address | addrlabel | route | rule | neigh | ntable |\n" | |
68 | " tunnel | tuntap | maddress | mroute | mrule | monitor | xfrm |\n" | |
69 | " netns | l2tp | fou | macsec | tcp_metrics | token | netconf | ila |\n" | |
70 | " vrf | sr | nexthop | mptcp }\n" | |
71 | " OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n" | |
72 | " -h[uman-readable] | -iec | -j[son] | -p[retty] |\n" | |
73 | " -f[amily] { inet | inet6 | mpls | bridge | link } |\n" | |
74 | " -4 | -6 | -I | -D | -M | -B | -0 |\n" | |
75 | " -l[oops] { maximum-addr-flush-attempts } | -br[ief] |\n" | |
76 | " -o[neline] | -t[imestamp] | -ts[hort] | -b[atch] [filename] |\n" | |
77 | " -rc[vbuf] [size] | -n[etns] name | -N[umeric] | -a[ll] |\n" | |
78 | " -c[olor]}\n"); | |
79 | exit(-1); | |
80 | } | |
81 | ||
82 | static int do_help(int argc, char **argv) | |
83 | { | |
84 | usage(); | |
85 | return 0; | |
86 | } | |
87 | ||
88 | static const struct cmd { | |
89 | const char *cmd; | |
90 | int (*func)(int argc, char **argv); | |
91 | } cmds[] = { | |
92 | { "address", do_ipaddr }, | |
93 | { "addrlabel", do_ipaddrlabel }, | |
94 | { "maddress", do_multiaddr }, | |
95 | { "route", do_iproute }, | |
96 | { "rule", do_iprule }, | |
97 | { "neighbor", do_ipneigh }, | |
98 | { "neighbour", do_ipneigh }, | |
99 | { "ntable", do_ipntable }, | |
100 | { "ntbl", do_ipntable }, | |
101 | { "link", do_iplink }, | |
102 | { "l2tp", do_ipl2tp }, | |
103 | { "fou", do_ipfou }, | |
104 | { "ila", do_ipila }, | |
105 | { "macsec", do_ipmacsec }, | |
106 | { "tunnel", do_iptunnel }, | |
107 | { "tunl", do_iptunnel }, | |
108 | { "tuntap", do_iptuntap }, | |
109 | { "tap", do_iptuntap }, | |
110 | { "token", do_iptoken }, | |
111 | { "tcpmetrics", do_tcp_metrics }, | |
112 | { "tcp_metrics", do_tcp_metrics }, | |
113 | { "monitor", do_ipmonitor }, | |
114 | { "xfrm", do_xfrm }, | |
115 | { "mroute", do_multiroute }, | |
116 | { "mrule", do_multirule }, | |
117 | { "netns", do_netns }, | |
118 | { "netconf", do_ipnetconf }, | |
119 | { "vrf", do_ipvrf}, | |
120 | { "sr", do_seg6 }, | |
121 | { "nexthop", do_ipnh }, | |
122 | { "mptcp", do_mptcp }, | |
123 | { "help", do_help }, | |
124 | { 0 } | |
125 | }; | |
126 | ||
127 | static int do_cmd(const char *argv0, int argc, char **argv) | |
128 | { | |
129 | const struct cmd *c; | |
130 | ||
131 | for (c = cmds; c->cmd; ++c) { | |
132 | if (matches(argv0, c->cmd) == 0) | |
133 | return -(c->func(argc-1, argv+1)); | |
134 | } | |
135 | ||
136 | fprintf(stderr, "Object \"%s\" is unknown, try \"ip help\".\n", argv0); | |
137 | return EXIT_FAILURE; | |
138 | } | |
139 | ||
140 | static int ip_batch_cmd(int argc, char *argv[], void *data) | |
141 | { | |
142 | const int *orig_family = data; | |
143 | ||
144 | preferred_family = *orig_family; | |
145 | return do_cmd(argv[0], argc, argv); | |
146 | } | |
147 | ||
148 | static int batch(const char *name) | |
149 | { | |
150 | int orig_family = preferred_family; | |
151 | int ret; | |
152 | ||
153 | if (rtnl_open(&rth, 0) < 0) { | |
154 | fprintf(stderr, "Cannot open rtnetlink\n"); | |
155 | return EXIT_FAILURE; | |
156 | } | |
157 | ||
158 | ret = do_batch(name, force, ip_batch_cmd, &orig_family); | |
159 | ||
160 | rtnl_close(&rth); | |
161 | return ret; | |
162 | } | |
163 | ||
164 | int main(int argc, char **argv) | |
165 | { | |
166 | const char *libbpf_version; | |
167 | char *batch_file = NULL; | |
168 | char *basename; | |
169 | int color = 0; | |
170 | ||
171 | /* to run vrf exec without root, capabilities might be set, drop them | |
172 | * if not needed as the first thing. | |
173 | * execv will drop them for the child command. | |
174 | * vrf exec requires: | |
175 | * - cap_dac_override to create the cgroup subdir in /sys | |
176 | * - cap_sys_admin to load the BPF program | |
177 | * - cap_net_admin to set the socket into the cgroup | |
178 | */ | |
179 | if (argc < 3 || strcmp(argv[1], "vrf") != 0 || | |
180 | strcmp(argv[2], "exec") != 0) | |
181 | drop_cap(); | |
182 | ||
183 | basename = strrchr(argv[0], '/'); | |
184 | if (basename == NULL) | |
185 | basename = argv[0]; | |
186 | else | |
187 | basename++; | |
188 | ||
189 | while (argc > 1) { | |
190 | char *opt = argv[1]; | |
191 | ||
192 | if (strcmp(opt, "--") == 0) { | |
193 | argc--; argv++; | |
194 | break; | |
195 | } | |
196 | if (opt[0] != '-') | |
197 | break; | |
198 | if (opt[1] == '-') | |
199 | opt++; | |
200 | if (matches(opt, "-loops") == 0) { | |
201 | argc--; | |
202 | argv++; | |
203 | if (argc <= 1) | |
204 | usage(); | |
205 | max_flush_loops = atoi(argv[1]); | |
206 | } else if (matches(opt, "-family") == 0) { | |
207 | argc--; | |
208 | argv++; | |
209 | if (argc <= 1) | |
210 | usage(); | |
211 | if (strcmp(argv[1], "help") == 0) | |
212 | usage(); | |
213 | else | |
214 | preferred_family = read_family(argv[1]); | |
215 | if (preferred_family == AF_UNSPEC) | |
216 | invarg("invalid protocol family", argv[1]); | |
217 | } else if (strcmp(opt, "-4") == 0) { | |
218 | preferred_family = AF_INET; | |
219 | } else if (strcmp(opt, "-6") == 0) { | |
220 | preferred_family = AF_INET6; | |
221 | } else if (strcmp(opt, "-0") == 0) { | |
222 | preferred_family = AF_PACKET; | |
223 | } else if (strcmp(opt, "-D") == 0) { | |
224 | preferred_family = AF_DECnet; | |
225 | } else if (strcmp(opt, "-M") == 0) { | |
226 | preferred_family = AF_MPLS; | |
227 | } else if (strcmp(opt, "-B") == 0) { | |
228 | preferred_family = AF_BRIDGE; | |
229 | } else if (matches(opt, "-human") == 0 || | |
230 | matches(opt, "-human-readable") == 0) { | |
231 | ++human_readable; | |
232 | } else if (matches(opt, "-iec") == 0) { | |
233 | ++use_iec; | |
234 | } else if (matches(opt, "-stats") == 0 || | |
235 | matches(opt, "-statistics") == 0) { | |
236 | ++show_stats; | |
237 | } else if (matches(opt, "-details") == 0) { | |
238 | ++show_details; | |
239 | } else if (matches(opt, "-resolve") == 0) { | |
240 | ++resolve_hosts; | |
241 | } else if (matches(opt, "-oneline") == 0) { | |
242 | ++oneline; | |
243 | } else if (matches(opt, "-timestamp") == 0) { | |
244 | ++timestamp; | |
245 | } else if (matches(opt, "-tshort") == 0) { | |
246 | ++timestamp; | |
247 | ++timestamp_short; | |
248 | } else if (matches(opt, "-Version") == 0) { | |
249 | printf("ip utility, iproute2-%s", version); | |
250 | libbpf_version = get_libbpf_version(); | |
251 | if (libbpf_version) | |
252 | printf(", libbpf %s", libbpf_version); | |
253 | printf("\n"); | |
254 | exit(0); | |
255 | } else if (matches(opt, "-force") == 0) { | |
256 | ++force; | |
257 | } else if (matches(opt, "-batch") == 0) { | |
258 | argc--; | |
259 | argv++; | |
260 | if (argc <= 1) | |
261 | usage(); | |
262 | batch_file = argv[1]; | |
263 | } else if (matches(opt, "-brief") == 0) { | |
264 | ++brief; | |
265 | } else if (matches(opt, "-json") == 0) { | |
266 | ++json; | |
267 | } else if (matches(opt, "-pretty") == 0) { | |
268 | ++pretty; | |
269 | } else if (matches(opt, "-rcvbuf") == 0) { | |
270 | unsigned int size; | |
271 | ||
272 | argc--; | |
273 | argv++; | |
274 | if (argc <= 1) | |
275 | usage(); | |
276 | if (get_unsigned(&size, argv[1], 0)) { | |
277 | fprintf(stderr, "Invalid rcvbuf size '%s'\n", | |
278 | argv[1]); | |
279 | exit(-1); | |
280 | } | |
281 | rcvbuf = size; | |
282 | } else if (matches_color(opt, &color)) { | |
283 | } else if (matches(opt, "-help") == 0) { | |
284 | usage(); | |
285 | } else if (matches(opt, "-netns") == 0) { | |
286 | NEXT_ARG(); | |
287 | if (netns_switch(argv[1])) | |
288 | exit(-1); | |
289 | } else if (matches(opt, "-Numeric") == 0) { | |
290 | ++numeric; | |
291 | } else if (matches(opt, "-all") == 0) { | |
292 | do_all = true; | |
293 | } else { | |
294 | fprintf(stderr, | |
295 | "Option \"%s\" is unknown, try \"ip -help\".\n", | |
296 | opt); | |
297 | exit(-1); | |
298 | } | |
299 | argc--; argv++; | |
300 | } | |
301 | ||
302 | _SL_ = oneline ? "\\" : "\n"; | |
303 | ||
304 | check_enable_color(color, json); | |
305 | ||
306 | if (batch_file) | |
307 | return batch(batch_file); | |
308 | ||
309 | if (rtnl_open(&rth, 0) < 0) | |
310 | exit(1); | |
311 | ||
312 | rtnl_set_strict_dump(&rth); | |
313 | ||
314 | if (strlen(basename) > 2) | |
315 | return do_cmd(basename+2, argc, argv); | |
316 | ||
317 | if (argc > 1) | |
318 | return do_cmd(argv[1], argc-1, argv+1); | |
319 | ||
320 | rtnl_close(&rth); | |
321 | usage(); | |
322 | } |