1/*
2 * f_fw.c		FW filter.
3 *
4 *		This program is free software; you can redistribute 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:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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> /* IFNAMSIZ */
23#include "utils.h"
24#include "tc_util.h"
25
26static void explain(void)
27{
28	fprintf(stderr, "Usage: ... fw [ classid CLASSID ] [ police POLICE_SPEC ]\n");
29	fprintf(stderr, "       POLICE_SPEC := ... look at TBF\n");
30	fprintf(stderr, "       CLASSID := X:Y\n");
31}
32
33#define usage() return(-1)
34
35static int fw_parse_opt(struct filter_util *qu, char *handle, int argc, char **argv, struct nlmsghdr *n)
36{
37	struct tc_police tp;
38	struct tcmsg *t = NLMSG_DATA(n);
39	struct rtattr *tail;
40
41	memset(&tp, 0, sizeof(tp));
42
43	if (handle) {
44		if (get_u32(&t->tcm_handle, handle, 0)) {
45			fprintf(stderr, "Illegal \"handle\"\n");
46			return -1;
47		}
48	}
49
50	if (argc == 0)
51		return 0;
52
53	tail = NLMSG_TAIL(n);
54	addattr_l(n, 4096, TCA_OPTIONS, NULL, 0);
55
56	while (argc > 0) {
57		if (matches(*argv, "classid") == 0 ||
58		    matches(*argv, "flowid") == 0) {
59			unsigned handle;
60			NEXT_ARG();
61			if (get_tc_classid(&handle, *argv)) {
62				fprintf(stderr, "Illegal \"classid\"\n");
63				return -1;
64			}
65			addattr_l(n, 4096, TCA_FW_CLASSID, &handle, 4);
66		} else if (matches(*argv, "police") == 0) {
67			NEXT_ARG();
68			if (parse_police(&argc, &argv, TCA_FW_POLICE, n)) {
69				fprintf(stderr, "Illegal \"police\"\n");
70				return -1;
71			}
72			continue;
73		} else if (matches(*argv, "action") == 0) {
74			NEXT_ARG();
75			if (parse_action(&argc, &argv, TCA_FW_ACT, n)) {
76				fprintf(stderr, "Illegal fw \"action\"\n");
77				return -1;
78			}
79			continue;
80		} else if (strcmp(*argv, "indev") == 0) {
81			char d[IFNAMSIZ+1];
82			memset(d, 0, sizeof (d));
83			argc--;
84			argv++;
85			if (argc < 1) {
86				fprintf(stderr, "Illegal indev\n");
87				return -1;
88			}
89			strncpy(d, *argv, sizeof (d) - 1);
90			addattr_l(n, MAX_MSG, TCA_FW_INDEV, d, strlen(d) + 1);
91		} else if (strcmp(*argv, "help") == 0) {
92			explain();
93			return -1;
94		} else {
95			fprintf(stderr, "What is \"%s\"?\n", *argv);
96			explain();
97			return -1;
98		}
99		argc--; argv++;
100	}
101	tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
102	return 0;
103}
104
105static int fw_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 handle)
106{
107	struct rtattr *tb[TCA_FW_MAX+1];
108
109	if (opt == NULL)
110		return 0;
111
112	parse_rtattr_nested(tb, TCA_FW_MAX, opt);
113
114	if (handle)
115		fprintf(f, "handle 0x%x ", handle);
116
117	if (tb[TCA_FW_CLASSID]) {
118		SPRINT_BUF(b1);
119		fprintf(f, "classid %s ", sprint_tc_classid(*(__u32*)RTA_DATA(tb[TCA_FW_CLASSID]), b1));
120	}
121
122	if (tb[TCA_FW_POLICE])
123		tc_print_police(f, tb[TCA_FW_POLICE]);
124	if (tb[TCA_FW_INDEV]) {
125		struct rtattr *idev = tb[TCA_FW_INDEV];
126		fprintf(f, "input dev %s ",(char *)RTA_DATA(idev));
127	}
128
129	if (tb[TCA_FW_ACT]) {
130		fprintf(f, "\n");
131		tc_print_action(f, tb[TCA_FW_ACT]);
132	}
133	return 0;
134}
135
136struct filter_util fw_filter_util = {
137	.id = "fw",
138	.parse_fopt = fw_parse_opt,
139	.print_fopt = fw_print_opt,
140};
141