1/*
2 * f_basic.c		Basic Classifier
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:	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	fprintf(stderr, "\nNOTE: CLASSID is parsed as hexadecimal input.\n");
36}
37
38static int basic_parse_opt(struct filter_util *qu, char *handle,
39			   int argc, char **argv, struct nlmsghdr *n)
40{
41	struct tcmsg *t = NLMSG_DATA(n);
42	struct rtattr *tail;
43	long h = 0;
44
45	if (argc == 0)
46		return 0;
47
48	if (handle) {
49		h = strtol(handle, NULL, 0);
50		if (h == LONG_MIN || h == LONG_MAX) {
51			fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n",
52			    handle);
53			return -1;
54		}
55	}
56
57	t->tcm_handle = h;
58
59	tail = (struct rtattr*)(((void*)n)+NLMSG_ALIGN(n->nlmsg_len));
60	addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
61
62	while (argc > 0) {
63		if (matches(*argv, "match") == 0) {
64			NEXT_ARG();
65			if (parse_ematch(&argc, &argv, TCA_BASIC_EMATCHES, n)) {
66				fprintf(stderr, "Illegal \"ematch\"\n");
67				return -1;
68			}
69			continue;
70		} else if (matches(*argv, "classid") == 0 ||
71			   strcmp(*argv, "flowid") == 0) {
72			unsigned handle;
73			NEXT_ARG();
74			if (get_tc_classid(&handle, *argv)) {
75				fprintf(stderr, "Illegal \"classid\"\n");
76				return -1;
77			}
78			addattr_l(n, MAX_MSG, TCA_BASIC_CLASSID, &handle, 4);
79		} else if (matches(*argv, "action") == 0) {
80			NEXT_ARG();
81			if (parse_action(&argc, &argv, TCA_BASIC_ACT, n)) {
82				fprintf(stderr, "Illegal \"action\"\n");
83				return -1;
84			}
85			continue;
86
87		} else if (matches(*argv, "police") == 0) {
88			NEXT_ARG();
89			if (parse_police(&argc, &argv, TCA_BASIC_POLICE, n)) {
90				fprintf(stderr, "Illegal \"police\"\n");
91				return -1;
92			}
93			continue;
94		} else if (strcmp(*argv, "help") == 0) {
95			explain();
96			return -1;
97		} else {
98			fprintf(stderr, "What is \"%s\"?\n", *argv);
99			explain();
100			return -1;
101		}
102		argc--; argv++;
103	}
104
105	tail->rta_len = (((void*)n)+n->nlmsg_len) - (void*)tail;
106	return 0;
107}
108
109static int basic_print_opt(struct filter_util *qu, FILE *f,
110			   struct rtattr *opt, __u32 handle)
111{
112	struct rtattr *tb[TCA_BASIC_MAX+1];
113
114	if (opt == NULL)
115		return 0;
116
117	parse_rtattr_nested(tb, TCA_BASIC_MAX, opt);
118
119	if (handle)
120		fprintf(f, "handle 0x%x ", handle);
121
122	if (tb[TCA_BASIC_CLASSID]) {
123		SPRINT_BUF(b1);
124		fprintf(f, "flowid %s ",
125			sprint_tc_classid(rta_getattr_u32(tb[TCA_BASIC_CLASSID]), b1));
126	}
127
128	if (tb[TCA_BASIC_EMATCHES])
129		print_ematch(f, tb[TCA_BASIC_EMATCHES]);
130
131	if (tb[TCA_BASIC_POLICE]) {
132		fprintf(f, "\n");
133		tc_print_police(f, tb[TCA_BASIC_POLICE]);
134	}
135
136	if (tb[TCA_BASIC_ACT]) {
137		tc_print_action(f, tb[TCA_BASIC_ACT]);
138	}
139
140	return 0;
141}
142
143struct filter_util basic_filter_util = {
144	.id = "basic",
145	.parse_fopt = basic_parse_opt,
146	.print_fopt = basic_print_opt,
147};
148