1/*
2 * m_gact.c		generic 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 */
12
13#include <stdio.h>
14#include <stdlib.h>
15#include <unistd.h>
16#include <syslog.h>
17#include <fcntl.h>
18#include <sys/socket.h>
19#include <netinet/in.h>
20#include <arpa/inet.h>
21#include <string.h>
22
23#include "utils.h"
24#include "tc_util.h"
25#include <linux/tc_act/tc_gact.h>
26
27/* define to turn on probablity stuff */
28
29#ifdef CONFIG_GACT_PROB
30static const char *prob_n2a(int p)
31{
32	if (p == PGACT_NONE)
33		return "none";
34	if (p == PGACT_NETRAND)
35		return "netrand";
36	if (p == PGACT_DETERM)
37		return "determ";
38	return "none";
39}
40#endif
41
42static void
43explain(void)
44{
45#ifdef CONFIG_GACT_PROB
46	fprintf(stderr, "Usage: ... gact <ACTION> [RAND] [INDEX]\n");
47	fprintf(stderr,
48		"Where: \tACTION := reclassify | drop | continue | pass \n"
49		        "\tRAND := random <RANDTYPE> <ACTION> <VAL>\n"
50		        "\tRANDTYPE := netrand | determ\n"
51			"\tVAL : = value not exceeding 10000\n"
52			"\tINDEX := index value used\n"
53			"\n");
54#else
55	fprintf(stderr, "Usage: ... gact <ACTION> [INDEX]\n");
56	fprintf(stderr,
57		"Where: \tACTION := reclassify | drop | continue | pass \n"
58		"\tINDEX := index value used\n"
59		"\n");
60#endif
61}
62
63
64static void
65usage(void)
66{
67	explain();
68	exit(-1);
69}
70
71int
72get_act(char ***argv_p)
73{
74	char **argv = *argv_p;
75
76	if (matches(*argv, "reclassify") == 0) {
77		return TC_ACT_RECLASSIFY;
78	} else if (matches(*argv, "drop") == 0 || matches(*argv, "shot") == 0) {
79		return TC_ACT_SHOT;
80	} else if (matches(*argv, "continue") == 0) {
81		return TC_ACT_UNSPEC;
82	} else if (matches(*argv, "pipe") == 0) {
83		return TC_ACT_PIPE;
84	} else if (matches(*argv, "pass") == 0 || matches(*argv, "ok") == 0)  {
85		return TC_ACT_OK;
86	} else {
87		fprintf(stderr,"bad action type %s\n",*argv);
88		return -10;
89	}
90}
91
92int
93parse_gact(struct action_util *a, int *argc_p, char ***argv_p, int tca_id, struct nlmsghdr *n)
94{
95	int argc = *argc_p;
96	char **argv = *argv_p;
97	int ok = 0;
98	int action = TC_POLICE_RECLASSIFY;
99	struct tc_gact p;
100#ifdef CONFIG_GACT_PROB
101	int rd = 0;
102	struct tc_gact_p pp;
103#endif
104	struct rtattr *tail;
105
106	memset(&p, 0, sizeof (p));
107	p.action = TC_POLICE_RECLASSIFY;
108
109	if (argc < 0)
110		return -1;
111
112
113	if (matches(*argv, "gact") == 0) {
114		ok++;
115	} else {
116		action = get_act(&argv);
117		if (action != -10) {
118			p.action = action;
119			ok++;
120		} else {
121			explain();
122			return action;
123		}
124	}
125
126	if (ok) {
127		argc--;
128		argv++;
129	}
130
131#ifdef CONFIG_GACT_PROB
132	if (ok && argc > 0) {
133		if (matches(*argv, "random") == 0) {
134			rd = 1;
135			NEXT_ARG();
136			if (matches(*argv, "netrand") == 0) {
137				NEXT_ARG();
138				pp.ptype = PGACT_NETRAND;
139			} else if  (matches(*argv, "determ") == 0) {
140				NEXT_ARG();
141				pp.ptype = PGACT_DETERM;
142			} else {
143				fprintf(stderr, "Illegal \"random type\"\n");
144				return -1;
145			}
146
147			action = get_act(&argv);
148			if (action != -10) { /* FIXME */
149				pp.paction = action;
150			} else {
151				explain();
152				return -1;
153			}
154			argc--;
155			argv++;
156			if (get_u16(&pp.pval, *argv, 10)) {
157				fprintf(stderr, "Illegal probability val 0x%x\n",pp.pval);
158				return -1;
159			}
160			if (pp.pval > 10000) {
161				fprintf(stderr, "Illegal probability val  0x%x\n",pp.pval);
162				return -1;
163			}
164			argc--;
165			argv++;
166		} else if (matches(*argv, "help") == 0) {
167				usage();
168		}
169	}
170#endif
171
172	if (argc > 0) {
173		if (matches(*argv, "index") == 0) {
174			NEXT_ARG();
175			if (get_u32(&p.index, *argv, 10)) {
176				fprintf(stderr, "Illegal \"index\"\n");
177				return -1;
178			}
179			argc--;
180			argv++;
181			ok++;
182		} else if (matches(*argv, "help") == 0) {
183				usage();
184		}
185	}
186
187	if (!ok)
188		return -1;
189
190	tail = NLMSG_TAIL(n);
191	addattr_l(n, MAX_MSG, tca_id, NULL, 0);
192	addattr_l(n, MAX_MSG, TCA_GACT_PARMS, &p, sizeof (p));
193#ifdef CONFIG_GACT_PROB
194	if (rd) {
195		addattr_l(n, MAX_MSG, TCA_GACT_PROB, &pp, sizeof (pp));
196	}
197#endif
198	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
199
200	*argc_p = argc;
201	*argv_p = argv;
202	return 0;
203}
204
205int
206print_gact(struct action_util *au,FILE * f, struct rtattr *arg)
207{
208	SPRINT_BUF(b1);
209#ifdef CONFIG_GACT_PROB
210	SPRINT_BUF(b2);
211	struct tc_gact_p *pp = NULL;
212	struct tc_gact_p pp_dummy;
213#endif
214	struct tc_gact *p = NULL;
215	struct rtattr *tb[TCA_GACT_MAX + 1];
216
217	if (arg == NULL)
218		return -1;
219
220	parse_rtattr_nested(tb, TCA_GACT_MAX, arg);
221
222	if (tb[TCA_GACT_PARMS] == NULL) {
223		fprintf(f, "[NULL gact parameters]");
224		return -1;
225	}
226	p = RTA_DATA(tb[TCA_GACT_PARMS]);
227
228	fprintf(f, "gact action %s", action_n2a(p->action, b1, sizeof (b1)));
229#ifdef CONFIG_GACT_PROB
230	if (NULL != tb[TCA_GACT_PROB]) {
231		pp = RTA_DATA(tb[TCA_GACT_PROB]);
232	} else {
233		/* need to keep consistent output */
234		memset(&pp_dummy, 0, sizeof (pp_dummy));
235		pp = &pp_dummy;
236	}
237	fprintf(f, "\n\t random type %s %s val %d",prob_n2a(pp->ptype), action_n2a(pp->paction, b2, sizeof (b2)), pp->pval);
238#endif
239	fprintf(f, "\n\t index %d ref %d bind %d",p->index, p->refcnt, p->bindcnt);
240	if (show_stats) {
241		if (tb[TCA_GACT_TM]) {
242			struct tcf_t *tm = RTA_DATA(tb[TCA_GACT_TM]);
243			print_tm(f,tm);
244		}
245	}
246	fprintf(f, "\n ");
247	return 0;
248}
249
250struct action_util gact_action_util = {
251	.id = "gact",
252	.parse_aopt = parse_gact,
253	.print_aopt = print_gact,
254};
255