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
explain(void)26 static 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 fprintf(stderr, "\nNOTE: CLASSID is parsed as hexadecimal input.\n");
32 }
33
fw_parse_opt(struct filter_util * qu,char * handle,int argc,char ** argv,struct nlmsghdr * n)34 static int fw_parse_opt(struct filter_util *qu, char *handle, int argc, char **argv, struct nlmsghdr *n)
35 {
36 struct tc_police tp;
37 struct tcmsg *t = NLMSG_DATA(n);
38 struct rtattr *tail;
39 __u32 mask = 0;
40 int mask_set = 0;
41
42 memset(&tp, 0, sizeof(tp));
43
44 if (handle) {
45 char *slash;
46 if ((slash = strchr(handle, '/')) != NULL)
47 *slash = '\0';
48 if (get_u32(&t->tcm_handle, handle, 0)) {
49 fprintf(stderr, "Illegal \"handle\"\n");
50 return -1;
51 }
52 if (slash) {
53 if (get_u32(&mask, slash+1, 0)) {
54 fprintf(stderr, "Illegal \"handle\" mask\n");
55 return -1;
56 }
57 mask_set = 1;
58 }
59 }
60
61 if (argc == 0)
62 return 0;
63
64 tail = NLMSG_TAIL(n);
65 addattr_l(n, 4096, TCA_OPTIONS, NULL, 0);
66
67 if (mask_set)
68 addattr32(n, MAX_MSG, TCA_FW_MASK, mask);
69
70 while (argc > 0) {
71 if (matches(*argv, "classid") == 0 ||
72 matches(*argv, "flowid") == 0) {
73 unsigned handle;
74 NEXT_ARG();
75 if (get_tc_classid(&handle, *argv)) {
76 fprintf(stderr, "Illegal \"classid\"\n");
77 return -1;
78 }
79 addattr_l(n, 4096, TCA_FW_CLASSID, &handle, 4);
80 } else if (matches(*argv, "police") == 0) {
81 NEXT_ARG();
82 if (parse_police(&argc, &argv, TCA_FW_POLICE, n)) {
83 fprintf(stderr, "Illegal \"police\"\n");
84 return -1;
85 }
86 continue;
87 } else if (matches(*argv, "action") == 0) {
88 NEXT_ARG();
89 if (parse_action(&argc, &argv, TCA_FW_ACT, n)) {
90 fprintf(stderr, "Illegal fw \"action\"\n");
91 return -1;
92 }
93 continue;
94 } else if (strcmp(*argv, "indev") == 0) {
95 char d[IFNAMSIZ+1];
96 memset(d, 0, sizeof (d));
97 argc--;
98 argv++;
99 if (argc < 1) {
100 fprintf(stderr, "Illegal indev\n");
101 return -1;
102 }
103 strncpy(d, *argv, sizeof (d) - 1);
104 addattr_l(n, MAX_MSG, TCA_FW_INDEV, d, strlen(d) + 1);
105 } else if (strcmp(*argv, "help") == 0) {
106 explain();
107 return -1;
108 } else {
109 fprintf(stderr, "What is \"%s\"?\n", *argv);
110 explain();
111 return -1;
112 }
113 argc--; argv++;
114 }
115 tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail;
116 return 0;
117 }
118
fw_print_opt(struct filter_util * qu,FILE * f,struct rtattr * opt,__u32 handle)119 static int fw_print_opt(struct filter_util *qu, FILE *f, struct rtattr *opt, __u32 handle)
120 {
121 struct rtattr *tb[TCA_FW_MAX+1];
122
123 if (opt == NULL)
124 return 0;
125
126 parse_rtattr_nested(tb, TCA_FW_MAX, opt);
127
128 if (handle || tb[TCA_FW_MASK]) {
129 __u32 mark = 0, mask = 0;
130 if(handle)
131 mark = handle;
132 if(tb[TCA_FW_MASK] &&
133 (mask = *(__u32*)RTA_DATA(tb[TCA_FW_MASK])) != 0xFFFFFFFF)
134 fprintf(f, "handle 0x%x/0x%x ", mark, mask);
135 else
136 fprintf(f, "handle 0x%x ", handle);
137 }
138
139 if (tb[TCA_FW_CLASSID]) {
140 SPRINT_BUF(b1);
141 fprintf(f, "classid %s ", sprint_tc_classid(*(__u32*)RTA_DATA(tb[TCA_FW_CLASSID]), b1));
142 }
143
144 if (tb[TCA_FW_POLICE])
145 tc_print_police(f, tb[TCA_FW_POLICE]);
146 if (tb[TCA_FW_INDEV]) {
147 struct rtattr *idev = tb[TCA_FW_INDEV];
148 fprintf(f, "input dev %s ",(char *)RTA_DATA(idev));
149 }
150
151 if (tb[TCA_FW_ACT]) {
152 fprintf(f, "\n");
153 tc_print_action(f, tb[TCA_FW_ACT]);
154 }
155 return 0;
156 }
157
158 struct filter_util fw_filter_util = {
159 .id = "fw",
160 .parse_fopt = fw_parse_opt,
161 .print_fopt = fw_print_opt,
162 };
163