1 /*
2 * f_cgroup.c Control Group 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@infradead.org>
10 *
11 */
12
13 #include <stdio.h>
14 #include <stdlib.h>
15 #include "utils.h"
16 #include "tc_util.h"
17 #include "m_ematch.h"
18
explain(void)19 static void explain(void)
20 {
21 fprintf(stderr, "Usage: ... cgroup [ match EMATCH_TREE ]\n");
22 fprintf(stderr, " [ action ACTION_SPEC ]\n");
23 }
24
cgroup_parse_opt(struct filter_util * qu,char * handle,int argc,char ** argv,struct nlmsghdr * n)25 static int cgroup_parse_opt(struct filter_util *qu, char *handle,
26 int argc, char **argv, struct nlmsghdr *n)
27 {
28 struct tcmsg *t = NLMSG_DATA(n);
29 struct rtattr *tail;
30 long h = 0;
31
32 if (handle) {
33 h = strtol(handle, NULL, 0);
34 if (h == LONG_MIN || h == LONG_MAX) {
35 fprintf(stderr, "Illegal handle \"%s\", must be numeric.\n",
36 handle);
37 return -1;
38 }
39 }
40
41 t->tcm_handle = h;
42
43 tail = (struct rtattr *)(((void *)n)+NLMSG_ALIGN(n->nlmsg_len));
44 addattr_l(n, MAX_MSG, TCA_OPTIONS, NULL, 0);
45
46 while (argc > 0) {
47 if (matches(*argv, "match") == 0) {
48 NEXT_ARG();
49 if (parse_ematch(&argc, &argv, TCA_CGROUP_EMATCHES, n)) {
50 fprintf(stderr, "Illegal \"ematch\"\n");
51 return -1;
52 }
53 continue;
54 } else if (matches(*argv, "action") == 0) {
55 NEXT_ARG();
56 if (parse_action(&argc, &argv, TCA_CGROUP_ACT, n)) {
57 fprintf(stderr, "Illegal \"action\"\n");
58 return -1;
59 }
60 continue;
61
62 } else if (matches(*argv, "police") == 0) {
63 NEXT_ARG();
64 if (parse_police(&argc, &argv, TCA_CGROUP_POLICE, n)) {
65 fprintf(stderr, "Illegal \"police\"\n");
66 return -1;
67 }
68 continue;
69 } else if (strcmp(*argv, "help") == 0) {
70 explain();
71 return -1;
72 } else {
73 fprintf(stderr, "What is \"%s\"?\n", *argv);
74 explain();
75 return -1;
76 }
77 }
78
79 tail->rta_len = (((void *)n)+n->nlmsg_len) - (void *)tail;
80 return 0;
81 }
82
cgroup_print_opt(struct filter_util * qu,FILE * f,struct rtattr * opt,__u32 handle)83 static int cgroup_print_opt(struct filter_util *qu, FILE *f,
84 struct rtattr *opt, __u32 handle)
85 {
86 struct rtattr *tb[TCA_CGROUP_MAX+1];
87
88 if (opt == NULL)
89 return 0;
90
91 parse_rtattr_nested(tb, TCA_CGROUP_MAX, opt);
92
93 if (handle)
94 fprintf(f, "handle 0x%x ", handle);
95
96 if (tb[TCA_CGROUP_EMATCHES])
97 print_ematch(f, tb[TCA_CGROUP_EMATCHES]);
98
99 if (tb[TCA_CGROUP_POLICE]) {
100 fprintf(f, "\n");
101 tc_print_police(f, tb[TCA_CGROUP_POLICE]);
102 }
103
104 if (tb[TCA_CGROUP_ACT])
105 tc_print_action(f, tb[TCA_CGROUP_ACT], 0);
106
107 return 0;
108 }
109
110 struct filter_util cgroup_filter_util = {
111 .id = "cgroup",
112 .parse_fopt = cgroup_parse_opt,
113 .print_fopt = cgroup_print_opt,
114 };
115