f_fw.c revision aba5acdfdb347d2c21fc67d613d83d4430ca3937 
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
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 = (struct rtattr*)(((void*)n)+NLMSG_ALIGN(n->nlmsg_len));
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 (strcmp(*argv, "help") == 0) {
74			explain();
75			return -1;
76		} else {
77			fprintf(stderr, "What is \"%s\"?\n", *argv);
78			explain();
79			return -1;
80		}
81		argc--; argv++;
82	}
83	tail->rta_len = (((void*)n)+n->nlmsg_len) - (void*)tail;
84	return 0;
85}
86
87static int fw_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 handle)
88{
89	struct rtattr *tb[TCA_FW_MAX+1];
90
91	if (opt == NULL)
92		return 0;
93
94	memset(tb, 0, sizeof(tb));
95	if (opt)
96		parse_rtattr(tb, TCA_FW_MAX, RTA_DATA(opt), RTA_PAYLOAD(opt));
97
98	if (handle)
99		fprintf(f, "handle 0x%x ", handle);
100
101	if (tb[TCA_FW_CLASSID]) {
102		SPRINT_BUF(b1);
103		fprintf(f, "classid %s ", sprint_tc_classid(*(__u32*)RTA_DATA(tb[TCA_FW_CLASSID]), b1));
104	}
105
106	if (tb[TCA_FW_POLICE])
107		tc_print_police(f, tb[TCA_FW_POLICE]);
108	return 0;
109}
110
111struct filter_util fw_util = {
112	NULL,
113	"fw",
114	fw_parse_opt,
115	fw_print_opt,
116};
117