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1 /*
2 * m_egress.c ingress/egress packet mirror/redir actions module
3 *
4 * This program is free software; you can distribute 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: J Hadi Salim (hadi@cyberus.ca)
10 *
11 * TODO: Add Ingress support
12 *
13 */
14
15 #include <stdio.h>
16 #include <stdlib.h>
17 #include <unistd.h>
18 #include <fcntl.h>
19 #include <sys/socket.h>
20 #include <netinet/in.h>
21 #include <arpa/inet.h>
22 #include <string.h>
23 #include "utils.h"
24 #include "tc_util.h"
25 #include "tc_common.h"
26 #include <linux/tc_act/tc_mirred.h>
27
28 static void
29 explain(void)
30 {
31 fprintf(stderr,
32 "Usage: mirred <DIRECTION> <ACTION> [index INDEX] <dev DEVICENAME>\n"
33 "where:\n"
34 "\tDIRECTION := <ingress | egress>\n"
35 "\tACTION := <mirror | redirect>\n"
36 "\tINDEX is the specific policy instance id\n"
37 "\tDEVICENAME is the devicename\n");
38 }
39
40 static void
41 usage(void)
42 {
43 explain();
44 exit(-1);
45 }
46
47 static const char *mirred_n2a(int action)
48 {
49 switch (action) {
50 case TCA_EGRESS_REDIR:
51 return "Egress Redirect";
52 case TCA_INGRESS_REDIR:
53 return "Ingress Redirect";
54 case TCA_EGRESS_MIRROR:
55 return "Egress Mirror";
56 case TCA_INGRESS_MIRROR:
57 return "Ingress Mirror";
58 default:
59 return "unknown";
60 }
61 }
62
63 static const char *mirred_direction(int action)
64 {
65 switch (action) {
66 case TCA_EGRESS_REDIR:
67 case TCA_EGRESS_MIRROR:
68 return "egress";
69 case TCA_INGRESS_REDIR:
70 case TCA_INGRESS_MIRROR:
71 return "ingress";
72 default:
73 return "unknown";
74 }
75 }
76
77 static const char *mirred_action(int action)
78 {
79 switch (action) {
80 case TCA_EGRESS_REDIR:
81 case TCA_INGRESS_REDIR:
82 return "redirect";
83 case TCA_EGRESS_MIRROR:
84 case TCA_INGRESS_MIRROR:
85 return "mirror";
86 default:
87 return "unknown";
88 }
89 }
90
91 static int
92 parse_direction(struct action_util *a, int *argc_p, char ***argv_p,
93 int tca_id, struct nlmsghdr *n)
94 {
95
96 int argc = *argc_p;
97 char **argv = *argv_p;
98 int ok = 0, iok = 0, mirror = 0, redir = 0, ingress = 0, egress = 0;
99 struct tc_mirred p = {};
100 struct rtattr *tail;
101 char d[IFNAMSIZ] = {};
102
103 while (argc > 0) {
104
105 if (matches(*argv, "action") == 0) {
106 NEXT_ARG();
107 break;
108 } else if (!egress && matches(*argv, "egress") == 0) {
109 egress = 1;
110 if (ingress) {
111 fprintf(stderr,
112 "Can't have both egress and ingress\n");
113 return -1;
114 }
115 NEXT_ARG();
116 ok++;
117 continue;
118 } else if (!ingress && matches(*argv, "ingress") == 0) {
119 ingress = 1;
120 if (egress) {
121 fprintf(stderr,
122 "Can't have both ingress and egress\n");
123 return -1;
124 }
125 NEXT_ARG();
126 ok++;
127 continue;
128 } else {
129
130 if (matches(*argv, "index") == 0) {
131 NEXT_ARG();
132 if (get_u32(&p.index, *argv, 10)) {
133 fprintf(stderr, "Illegal \"index\"\n");
134 return -1;
135 }
136 iok++;
137 if (!ok) {
138 argc--;
139 argv++;
140 break;
141 }
142 } else if (!ok) {
143 fprintf(stderr,
144 "was expecting egress or ingress (%s)\n",
145 *argv);
146 break;
147
148 } else if (!mirror && matches(*argv, "mirror") == 0) {
149 mirror = 1;
150 if (redir) {
151 fprintf(stderr,
152 "Can't have both mirror and redir\n");
153 return -1;
154 }
155 p.eaction = egress ? TCA_EGRESS_MIRROR :
156 TCA_INGRESS_MIRROR;
157 p.action = TC_ACT_PIPE;
158 ok++;
159 } else if (!redir && matches(*argv, "redirect") == 0) {
160 redir = 1;
161 if (mirror) {
162 fprintf(stderr,
163 "Can't have both mirror and redir\n");
164 return -1;
165 }
166 p.eaction = egress ? TCA_EGRESS_REDIR :
167 TCA_INGRESS_REDIR;
168 p.action = TC_ACT_STOLEN;
169 ok++;
170 } else if ((redir || mirror) &&
171 matches(*argv, "dev") == 0) {
172 NEXT_ARG();
173 if (strlen(d))
174 duparg("dev", *argv);
175
176 strncpy(d, *argv, sizeof(d)-1);
177 argc--;
178 argv++;
179
180 break;
181
182 }
183 }
184
185 NEXT_ARG();
186 }
187
188 if (!ok && !iok)
189 return -1;
190
191 if (d[0]) {
192 int idx;
193
194 ll_init_map(&rth);
195
196 idx = ll_name_to_index(d);
197 if (!idx)
198 return nodev(d);
199
200 p.ifindex = idx;
201 }
202
203
204 if (p.eaction == TCA_EGRESS_MIRROR || p.eaction == TCA_INGRESS_MIRROR)
205 parse_action_control(&argc, &argv, &p.action, false);
206
207 if (argc) {
208 if (iok && matches(*argv, "index") == 0) {
209 fprintf(stderr, "mirred: Illegal double index\n");
210 return -1;
211 }
212
213 if (matches(*argv, "index") == 0) {
214 NEXT_ARG();
215 if (get_u32(&p.index, *argv, 10)) {
216 fprintf(stderr,
217 "mirred: Illegal \"index\"\n");
218 return -1;
219 }
220 argc--;
221 argv++;
222 }
223 }
224
225 tail = addattr_nest(n, MAX_MSG, tca_id);
226 addattr_l(n, MAX_MSG, TCA_MIRRED_PARMS, &p, sizeof(p));
227 addattr_nest_end(n, tail);
228
229 *argc_p = argc;
230 *argv_p = argv;
231 return 0;
232 }
233
234
235 static int
236 parse_mirred(struct action_util *a, int *argc_p, char ***argv_p,
237 int tca_id, struct nlmsghdr *n)
238 {
239
240 int argc = *argc_p;
241 char **argv = *argv_p;
242
243 if (argc < 0) {
244 fprintf(stderr, "mirred bad argument count %d\n", argc);
245 return -1;
246 }
247
248 if (matches(*argv, "mirred") == 0) {
249 NEXT_ARG();
250 } else {
251 fprintf(stderr, "mirred bad argument %s\n", *argv);
252 return -1;
253 }
254
255
256 if (matches(*argv, "egress") == 0 || matches(*argv, "ingress") == 0 ||
257 matches(*argv, "index") == 0) {
258 int ret = parse_direction(a, &argc, &argv, tca_id, n);
259
260 if (ret == 0) {
261 *argc_p = argc;
262 *argv_p = argv;
263 return 0;
264 }
265
266 } else if (matches(*argv, "help") == 0) {
267 usage();
268 } else {
269 fprintf(stderr, "mirred option not supported %s\n", *argv);
270 }
271
272 return -1;
273
274 }
275
276 static int
277 print_mirred(struct action_util *au, FILE *f, struct rtattr *arg)
278 {
279 struct tc_mirred *p;
280 struct rtattr *tb[TCA_MIRRED_MAX + 1];
281 const char *dev;
282
283 if (arg == NULL)
284 return -1;
285
286 parse_rtattr_nested(tb, TCA_MIRRED_MAX, arg);
287
288 if (tb[TCA_MIRRED_PARMS] == NULL) {
289 print_string(PRINT_FP, NULL, "%s", "[NULL mirred parameters]");
290 return -1;
291 }
292 p = RTA_DATA(tb[TCA_MIRRED_PARMS]);
293
294 dev = ll_index_to_name(p->ifindex);
295 if (dev == 0) {
296 fprintf(stderr, "Cannot find device %d\n", p->ifindex);
297 return -1;
298 }
299
300 print_string(PRINT_ANY, "kind", "%s ", "mirred");
301 print_string(PRINT_FP, NULL, "(%s", mirred_n2a(p->eaction));
302 print_string(PRINT_JSON, "mirred_action", NULL,
303 mirred_action(p->eaction));
304 print_string(PRINT_JSON, "direction", NULL,
305 mirred_direction(p->eaction));
306 print_string(PRINT_ANY, "to_dev", " to device %s)", dev);
307 print_action_control(f, " ", p->action, "");
308
309 print_uint(PRINT_ANY, "index", "\n \tindex %u", p->index);
310 print_int(PRINT_ANY, "ref", " ref %d", p->refcnt);
311 print_int(PRINT_ANY, "bind", " bind %d", p->bindcnt);
312
313 if (show_stats) {
314 if (tb[TCA_MIRRED_TM]) {
315 struct tcf_t *tm = RTA_DATA(tb[TCA_MIRRED_TM]);
316
317 print_tm(f, tm);
318 }
319 }
320 print_string(PRINT_FP, NULL, "%s", "\n ");
321 return 0;
322 }
323
324 struct action_util mirred_action_util = {
325 .id = "mirred",
326 .parse_aopt = parse_mirred,
327 .print_aopt = print_mirred,
328 };