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
explain(void)28 static void explain(void)
29 {
30 fprintf(stderr, "Usage: ... basic [ match EMATCH_TREE ] \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, " ACTION_SPEC := ... look at individual actions\n");
36 fprintf(stderr, "\nNOTE: CLASSID is parsed as hexadecimal input.\n");
37 }
38
basic_parse_opt(struct filter_util * qu,char * handle,int argc,char ** argv,struct nlmsghdr * n)39 static int basic_parse_opt(struct filter_util *qu, char *handle,
40 int argc, char **argv, struct nlmsghdr *n)
41 {
42 struct tcmsg *t = NLMSG_DATA(n);
43 struct rtattr *tail;
44 long h = 0;
45
46 if (handle) {
47 h = strtol(handle, NULL, 0);
48 if (h == LONG_MIN || h == LONG_MAX) {
49 fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n",
50 handle);
51 return -1;
52 }
53 }
54 t->tcm_handle = h;
55
56 if (argc == 0)
57 return 0;
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
basic_print_opt(struct filter_util * qu,FILE * f,struct rtattr * opt,__u32 handle)109 static 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
143 struct filter_util basic_filter_util = {
144 .id = "basic",
145 .parse_fopt = basic_parse_opt,
146 .print_fopt = basic_print_opt,
147 };
148