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tc: jsonify mirred action
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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, "Usage: mirred <DIRECTION> <ACTION> [index INDEX] <dev DEVICENAME>\n");
32 fprintf(stderr, "where:\n");
33 fprintf(stderr, "\tDIRECTION := <ingress | egress>\n");
34 fprintf(stderr, "\tACTION := <mirror | redirect>\n");
35 fprintf(stderr, "\tINDEX is the specific policy instance id\n");
36 fprintf(stderr, "\tDEVICENAME is the devicename\n");
37
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 break;
107 } else if (!egress && matches(*argv, "egress") == 0) {
108 egress = 1;
109 if (ingress) {
110 fprintf(stderr, "Can't have both egress and ingress\n");
111 return -1;
112 }
113 NEXT_ARG();
114 ok++;
115 continue;
116 } else if (!ingress && matches(*argv, "ingress") == 0) {
117 ingress = 1;
118 if (egress) {
119 fprintf(stderr, "Can't have both ingress and egress\n");
120 return -1;
121 }
122 NEXT_ARG();
123 ok++;
124 continue;
125 } else {
126
127 if (matches(*argv, "index") == 0) {
128 NEXT_ARG();
129 if (get_u32(&p.index, *argv, 10)) {
130 fprintf(stderr, "Illegal \"index\"\n");
131 return -1;
132 }
133 iok++;
134 if (!ok) {
135 argc--;
136 argv++;
137 break;
138 }
139 } else if (!ok) {
140 fprintf(stderr, "was expecting egress or ingress (%s)\n", *argv);
141 break;
142
143 } else if (!mirror && matches(*argv, "mirror") == 0) {
144 mirror = 1;
145 if (redir) {
146 fprintf(stderr, "Can't have both mirror and redir\n");
147 return -1;
148 }
149 p.eaction = egress ? TCA_EGRESS_MIRROR :
150 TCA_INGRESS_MIRROR;
151 p.action = TC_ACT_PIPE;
152 ok++;
153 } else if (!redir && matches(*argv, "redirect") == 0) {
154 redir = 1;
155 if (mirror) {
156 fprintf(stderr, "Can't have both mirror and redir\n");
157 return -1;
158 }
159 p.eaction = egress ? TCA_EGRESS_REDIR :
160 TCA_INGRESS_REDIR;
161 p.action = TC_ACT_STOLEN;
162 ok++;
163 } else if ((redir || mirror) && matches(*argv, "dev") == 0) {
164 NEXT_ARG();
165 if (strlen(d))
166 duparg("dev", *argv);
167
168 strncpy(d, *argv, sizeof(d)-1);
169 argc--;
170 argv++;
171
172 break;
173
174 }
175 }
176
177 NEXT_ARG();
178 }
179
180 if (!ok && !iok) {
181 return -1;
182 }
183
184
185
186 if (d[0]) {
187 int idx;
188
189 ll_init_map(&rth);
190
191 if ((idx = ll_name_to_index(d)) == 0) {
192 fprintf(stderr, "Cannot find device \"%s\"\n", d);
193 return -1;
194 }
195
196 p.ifindex = idx;
197 }
198
199
200 if (p.eaction == TCA_EGRESS_MIRROR || p.eaction == TCA_INGRESS_MIRROR)
201 parse_action_control(&argc, &argv, &p.action, false);
202
203 if (argc) {
204 if (iok && matches(*argv, "index") == 0) {
205 fprintf(stderr, "mirred: Illegal double index\n");
206 return -1;
207 } else {
208 if (matches(*argv, "index") == 0) {
209 NEXT_ARG();
210 if (get_u32(&p.index, *argv, 10)) {
211 fprintf(stderr, "mirred: Illegal \"index\"\n");
212 return -1;
213 }
214 argc--;
215 argv++;
216 }
217 }
218 }
219
220 tail = NLMSG_TAIL(n);
221 addattr_l(n, MAX_MSG, tca_id, NULL, 0);
222 addattr_l(n, MAX_MSG, TCA_MIRRED_PARMS, &p, sizeof(p));
223 tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
224
225 *argc_p = argc;
226 *argv_p = argv;
227 return 0;
228 }
229
230
231 static int
232 parse_mirred(struct action_util *a, int *argc_p, char ***argv_p,
233 int tca_id, struct nlmsghdr *n)
234 {
235
236 int argc = *argc_p;
237 char **argv = *argv_p;
238
239 if (argc < 0) {
240 fprintf(stderr, "mirred bad argument count %d\n", argc);
241 return -1;
242 }
243
244 if (matches(*argv, "mirred") == 0) {
245 NEXT_ARG();
246 } else {
247 fprintf(stderr, "mirred bad argument %s\n", *argv);
248 return -1;
249 }
250
251
252 if (matches(*argv, "egress") == 0 || matches(*argv, "ingress") == 0 ||
253 matches(*argv, "index") == 0) {
254 int ret = parse_direction(a, &argc, &argv, tca_id, n);
255
256 if (ret == 0) {
257 *argc_p = argc;
258 *argv_p = argv;
259 return 0;
260 }
261
262 } else if (matches(*argv, "help") == 0) {
263 usage();
264 } else {
265 fprintf(stderr, "mirred option not supported %s\n", *argv);
266 }
267
268 return -1;
269
270 }
271
272 static int
273 print_mirred(struct action_util *au, FILE * f, struct rtattr *arg)
274 {
275 struct tc_mirred *p;
276 struct rtattr *tb[TCA_MIRRED_MAX + 1];
277 const char *dev;
278
279 if (arg == NULL)
280 return -1;
281
282 parse_rtattr_nested(tb, TCA_MIRRED_MAX, arg);
283
284 if (tb[TCA_MIRRED_PARMS] == NULL) {
285 print_string(PRINT_FP, NULL, "%s", "[NULL mirred parameters]");
286 return -1;
287 }
288 p = RTA_DATA(tb[TCA_MIRRED_PARMS]);
289
290 /*
291 ll_init_map(&rth);
292 */
293
294
295 if ((dev = ll_index_to_name(p->ifindex)) == 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 };