1/*
2 * f_basic.c		Basic Classifier
3 *
4 *		This program is free software; you can u32istribute 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:	Thomas Graf <tgraf@suug.ch>
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#include <linux/if.h>
23
24#include "utils.h"
25#include "tc_util.h"
26#include "m_ematch.h"
27
28static void explain(void)
29{
30	fprintf(stderr, "Usage: ... basic [ match EMATCH_TREE ] [ police POLICE_SPEC ]\n");
31	fprintf(stderr, "                 [ action ACTION_SPEC ] [ classid CLASSID ]\n");
32	fprintf(stderr, "\n");
33	fprintf(stderr, "Where: SELECTOR := SAMPLE SAMPLE ...\n");
34	fprintf(stderr, "       FILTERID := X:Y:Z\n");
35}
36
37static int basic_parse_opt(struct filter_util *qu, char *handle,
38			   int argc, char **argv, struct nlmsghdr *n)
39{
40	struct tcmsg *t = NLMSG_DATA(n);
41	struct rtattr *tail;
42	long h = 0;
43
44	if (argc == 0)
45		return 0;
46
47	if (handle) {
48		h = strtol(handle, NULL, 0);
49		if (h == LONG_MIN || h == LONG_MAX) {
50			fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n",
51			    handle);
52			return -1;
53		}
54	}
55
56	t->tcm_handle = h;
57
58	tail = (struct rtattr*)(((void*)n)+NLMSG_ALIGN(n->nlmsg_len));
59	addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
60
61	while (argc > 0) {
62		if (matches(*argv, "match") == 0) {
63			NEXT_ARG();
64			if (parse_ematch(&argc, &argv, TCA_BASIC_EMATCHES, n)) {
65				fprintf(stderr, "Illegal \"ematch\"\n");
66				return -1;
67			}
68			continue;
69		} else if (matches(*argv, "classid") == 0 ||
70			   strcmp(*argv, "flowid") == 0) {
71			unsigned handle;
72			NEXT_ARG();
73			if (get_tc_classid(&handle, *argv)) {
74				fprintf(stderr, "Illegal \"classid\"\n");
75				return -1;
76			}
77			addattr_l(n, MAX_MSG, TCA_BASIC_CLASSID, &handle, 4);
78		} else if (matches(*argv, "action") == 0) {
79			NEXT_ARG();
80			if (parse_action(&argc, &argv, TCA_BASIC_ACT, n)) {
81				fprintf(stderr, "Illegal \"action\"\n");
82				return -1;
83			}
84			continue;
85
86		} else if (matches(*argv, "police") == 0) {
87			NEXT_ARG();
88			if (parse_police(&argc, &argv, TCA_BASIC_POLICE, n)) {
89				fprintf(stderr, "Illegal \"police\"\n");
90				return -1;
91			}
92			continue;
93		} else if (strcmp(*argv, "help") == 0) {
94			explain();
95			return -1;
96		} else {
97			fprintf(stderr, "What is \"%s\"?\n", *argv);
98			explain();
99			return -1;
100		}
101		argc--; argv++;
102	}
103
104	tail->rta_len = (((void*)n)+n->nlmsg_len) - (void*)tail;
105	return 0;
106}
107
108static int basic_print_opt(struct filter_util *qu, FILE *f,
109			   struct rtattr *opt, __u32 handle)
110{
111	struct rtattr *tb[TCA_BASIC_MAX+1];
112
113	if (opt == NULL)
114		return 0;
115
116	parse_rtattr_nested(tb, TCA_BASIC_MAX, opt);
117
118	if (handle)
119		fprintf(f, "handle 0x%x ", handle);
120
121	if (tb[TCA_BASIC_CLASSID]) {
122		SPRINT_BUF(b1);
123		fprintf(f, "flowid %s ",
124			sprint_tc_classid(*(__u32*)RTA_DATA(tb[TCA_BASIC_CLASSID]), b1));
125	}
126
127	if (tb[TCA_BASIC_EMATCHES])
128		print_ematch(f, tb[TCA_BASIC_EMATCHES]);
129
130	if (tb[TCA_BASIC_POLICE]) {
131		fprintf(f, "\n");
132		tc_print_police(f, tb[TCA_BASIC_POLICE]);
133	}
134
135	if (tb[TCA_BASIC_ACT]) {
136		tc_print_action(f, tb[TCA_BASIC_ACT]);
137	}
138
139	return 0;
140}
141
142struct filter_util basic_filter_util = {
143	.id = "basic",
144	.parse_fopt = basic_parse_opt,
145	.print_fopt = basic_print_opt,
146};
147