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 <syslog.h>
19#include <fcntl.h>
20#include <sys/socket.h>
21#include <netinet/in.h>
22#include <arpa/inet.h>
23#include <string.h>
24#include "utils.h"
25#include "tc_util.h"
26#include "tc_common.h"
27#include <linux/tc_act/tc_mirred.h>
28
29static void
30explain(void)
31{
32	fprintf(stderr, "Usage: mirred <DIRECTION> <ACTION> [index INDEX] <dev DEVICENAME> \n");
33	fprintf(stderr, "where: \n");
34	fprintf(stderr, "\tDIRECTION := <ingress | egress>\n");
35	fprintf(stderr, "\tACTION := <mirror | redirect>\n");
36	fprintf(stderr, "\tINDEX  is the specific policy instance id\n");
37	fprintf(stderr, "\tDEVICENAME is the devicename \n");
38
39}
40
41static void
42usage(void)
43{
44	explain();
45	exit(-1);
46}
47
48char *mirred_n2a(int action)
49{
50	switch (action) {
51	case TCA_EGRESS_REDIR:
52		return "Egress Redirect";
53	case TCA_INGRESS_REDIR:
54		return "Ingress Redirect";
55	case TCA_EGRESS_MIRROR:
56		return "Egress Mirror";
57	case TCA_INGRESS_MIRROR:
58		return "Ingress Mirror";
59	default:
60		return "unknown";
61	}
62}
63
64int
65parse_egress(struct action_util *a, int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
66{
67
68	int argc = *argc_p;
69	char **argv = *argv_p;
70	int ok = 0, iok = 0, mirror=0,redir=0;
71	struct tc_mirred p;
72	struct rtattr *tail;
73	char d[16];
74
75	memset(d,0,sizeof(d)-1);
76	memset(&p,0,sizeof(struct tc_mirred));
77
78	while (argc > 0) {
79
80		if (matches(*argv, "action") == 0) {
81			break;
82		} else if (matches(*argv, "egress") == 0) {
83			NEXT_ARG();
84			ok++;
85			continue;
86		} else {
87
88			if (matches(*argv, "index") == 0) {
89				NEXT_ARG();
90				if (get_u32(&p.index, *argv, 10)) {
91					fprintf(stderr, "Illegal \"index\"\n");
92					return -1;
93				}
94				iok++;
95				if (!ok) {
96					argc--;
97					argv++;
98					break;
99				}
100			} else if(!ok) {
101				fprintf(stderr, "was expecting egress (%s)\n", *argv);
102				break;
103
104			} else if (!mirror && matches(*argv, "mirror") == 0) {
105				mirror=1;
106				if (redir) {
107					fprintf(stderr, "Cant have both mirror and redir\n");
108					return -1;
109				}
110				p.eaction = TCA_EGRESS_MIRROR;
111				p.action = TC_ACT_PIPE;
112				ok++;
113			} else if (!redir && matches(*argv, "redirect") == 0) {
114				redir=1;
115				if (mirror) {
116					fprintf(stderr, "Cant have both mirror and redir\n");
117					return -1;
118				}
119				p.eaction = TCA_EGRESS_REDIR;
120				p.action = TC_ACT_STOLEN;
121				ok++;
122			} else if ((redir || mirror) && matches(*argv, "dev") == 0) {
123				NEXT_ARG();
124				if (strlen(d))
125					duparg("dev", *argv);
126
127				strncpy(d, *argv, sizeof(d)-1);
128				argc--;
129				argv++;
130
131				break;
132
133			}
134		}
135
136		NEXT_ARG();
137	}
138
139	if (!ok && !iok) {
140		return -1;
141	}
142
143
144
145	if (d[0])  {
146		int idx;
147		ll_init_map(&rth);
148
149		if ((idx = ll_name_to_index(d)) == 0) {
150			fprintf(stderr, "Cannot find device \"%s\"\n", d);
151			return -1;
152		}
153
154		p.ifindex = idx;
155	}
156
157
158	if (argc && p.eaction == TCA_EGRESS_MIRROR) {
159
160		if (matches(*argv, "reclassify") == 0) {
161			p.action = TC_POLICE_RECLASSIFY;
162			NEXT_ARG();
163		} else if (matches(*argv, "pipe") == 0) {
164			p.action = TC_POLICE_PIPE;
165			NEXT_ARG();
166		} else if (matches(*argv, "drop") == 0 ||
167			   matches(*argv, "shot") == 0) {
168			p.action = TC_POLICE_SHOT;
169			NEXT_ARG();
170		} else if (matches(*argv, "continue") == 0) {
171			p.action = TC_POLICE_UNSPEC;
172			NEXT_ARG();
173		} else if (matches(*argv, "pass") == 0) {
174			p.action = TC_POLICE_OK;
175			NEXT_ARG();
176		}
177
178	}
179
180	if (argc) {
181		if (iok && matches(*argv, "index") == 0) {
182			fprintf(stderr, "mirred: Illegal double index\n");
183			return -1;
184		} else {
185			if (matches(*argv, "index") == 0) {
186				NEXT_ARG();
187				if (get_u32(&p.index, *argv, 10)) {
188					fprintf(stderr, "mirred: Illegal \"index\"\n");
189					return -1;
190				}
191				argc--;
192				argv++;
193			}
194		}
195	}
196
197	tail = NLMSG_TAIL(n);
198	addattr_l(n, MAX_MSG, tca_id, NULL, 0);
199	addattr_l(n, MAX_MSG, TCA_MIRRED_PARMS, &p, sizeof (p));
200	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
201
202	*argc_p = argc;
203	*argv_p = argv;
204	return 0;
205}
206
207
208int
209parse_mirred(struct action_util *a, int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
210{
211
212	int argc = *argc_p;
213	char **argv = *argv_p;
214
215	if (argc < 0) {
216		fprintf(stderr,"mirred bad arguement count %d\n", argc);
217		return -1;
218	}
219
220	if (matches(*argv, "mirred") == 0) {
221		NEXT_ARG();
222	} else {
223		fprintf(stderr,"mirred bad arguement %s\n", *argv);
224		return -1;
225	}
226
227
228	if (matches(*argv, "egress") == 0 || matches(*argv, "index") == 0) {
229		int ret = parse_egress(a, &argc, &argv, tca_id, n);
230		if (ret == 0) {
231			*argc_p = argc;
232			*argv_p = argv;
233			return 0;
234		}
235
236	} else if (matches(*argv, "ingress") == 0) {
237		fprintf(stderr,"mirred ingress not supported at the moment\n");
238	} else if (matches(*argv, "help") == 0) {
239		usage();
240	} else {
241		fprintf(stderr,"mirred option not supported %s\n", *argv);
242	}
243
244	return -1;
245
246}
247
248int
249print_mirred(struct action_util *au,FILE * f, struct rtattr *arg)
250{
251	struct tc_mirred *p;
252	struct rtattr *tb[TCA_MIRRED_MAX + 1];
253	const char *dev;
254	SPRINT_BUF(b1);
255
256	if (arg == NULL)
257		return -1;
258
259	parse_rtattr_nested(tb, TCA_MIRRED_MAX, arg);
260
261	if (tb[TCA_MIRRED_PARMS] == NULL) {
262		fprintf(f, "[NULL mirred parameters]");
263		return -1;
264	}
265	p = RTA_DATA(tb[TCA_MIRRED_PARMS]);
266
267	/*
268	ll_init_map(&rth);
269	*/
270
271
272	if ((dev = ll_index_to_name(p->ifindex)) == 0) {
273		fprintf(stderr, "Cannot find device %d\n", p->ifindex);
274		return -1;
275	}
276
277	fprintf(f, "mirred (%s to device %s) %s", mirred_n2a(p->eaction), dev,action_n2a(p->action, b1, sizeof (b1)));
278
279	fprintf(f, "\n ");
280	fprintf(f, "\tindex %d ref %d bind %d",p->index,p->refcnt,p->bindcnt);
281
282	if (show_stats) {
283		if (tb[TCA_MIRRED_TM]) {
284			struct tcf_t *tm = RTA_DATA(tb[TCA_MIRRED_TM]);
285			print_tm(f,tm);
286		}
287	}
288	fprintf(f, "\n ");
289	return 0;
290}
291
292struct action_util mirred_action_util = {
293	.id = "mirred",
294	.parse_aopt = parse_mirred,
295	.print_aopt = print_mirred,
296};
297