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1 | /* | |
2 | * m_gact.c generic actions module | |
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: J Hadi Salim (hadi@cyberus.ca) | |
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 | #include <linux/tc_act/tc_gact.h> | |
26 | ||
27 | /* define to turn on probablity stuff */ | |
28 | ||
29 | #ifdef CONFIG_GACT_PROB | |
30 | static const char *prob_n2a(int p) | |
31 | { | |
32 | if (p == PGACT_NONE) | |
33 | return "none"; | |
34 | if (p == PGACT_NETRAND) | |
35 | return "netrand"; | |
36 | if (p == PGACT_DETERM) | |
37 | return "determ"; | |
38 | return "none"; | |
39 | } | |
40 | #endif | |
41 | ||
42 | static void | |
43 | explain(void) | |
44 | { | |
45 | #ifdef CONFIG_GACT_PROB | |
46 | fprintf(stderr, "Usage: ... gact <ACTION> [RAND] [INDEX]\n"); | |
47 | fprintf(stderr, | |
48 | "Where: \tACTION := reclassify | drop | continue | pass | pipe |\n" | |
49 | " \t goto chain <CHAIN_INDEX>\n" | |
50 | "\tRAND := random <RANDTYPE> <ACTION> <VAL>\n" | |
51 | "\tRANDTYPE := netrand | determ\n" | |
52 | "\tVAL : = value not exceeding 10000\n" | |
53 | "\tINDEX := index value used\n" | |
54 | "\n"); | |
55 | #else | |
56 | fprintf(stderr, "Usage: ... gact <ACTION> [INDEX]\n"); | |
57 | fprintf(stderr, | |
58 | "Where: \tACTION := reclassify | drop | continue | pass | pipe |\n" | |
59 | " \t goto chain <CHAIN_INDEX>\n" | |
60 | "\tINDEX := index value used\n" | |
61 | "\n"); | |
62 | #endif | |
63 | } | |
64 | ||
65 | ||
66 | static void | |
67 | usage(void) | |
68 | { | |
69 | explain(); | |
70 | exit(-1); | |
71 | } | |
72 | ||
73 | static int | |
74 | parse_gact(struct action_util *a, int *argc_p, char ***argv_p, | |
75 | int tca_id, struct nlmsghdr *n) | |
76 | { | |
77 | int argc = *argc_p; | |
78 | char **argv = *argv_p; | |
79 | int ok = 0; | |
80 | struct tc_gact p = { 0 }; | |
81 | #ifdef CONFIG_GACT_PROB | |
82 | int rd = 0; | |
83 | struct tc_gact_p pp; | |
84 | #endif | |
85 | struct rtattr *tail; | |
86 | ||
87 | if (argc < 0) | |
88 | return -1; | |
89 | ||
90 | ||
91 | if (matches(*argv, "gact") == 0) { | |
92 | ok++; | |
93 | argc--; | |
94 | argv++; | |
95 | } else { | |
96 | if (parse_action_control(&argc, &argv, &p.action, false) == -1) | |
97 | usage(); | |
98 | ok++; | |
99 | } | |
100 | ||
101 | #ifdef CONFIG_GACT_PROB | |
102 | if (ok && argc > 0) { | |
103 | if (matches(*argv, "random") == 0) { | |
104 | rd = 1; | |
105 | NEXT_ARG(); | |
106 | if (matches(*argv, "netrand") == 0) { | |
107 | NEXT_ARG(); | |
108 | pp.ptype = PGACT_NETRAND; | |
109 | } else if (matches(*argv, "determ") == 0) { | |
110 | NEXT_ARG(); | |
111 | pp.ptype = PGACT_DETERM; | |
112 | } else { | |
113 | fprintf(stderr, "Illegal \"random type\"\n"); | |
114 | return -1; | |
115 | } | |
116 | ||
117 | if (parse_action_control(&argc, &argv, | |
118 | &pp.paction, false) == -1) | |
119 | usage(); | |
120 | if (get_u16(&pp.pval, *argv, 10)) { | |
121 | fprintf(stderr, "Illegal probability val 0x%x\n", pp.pval); | |
122 | return -1; | |
123 | } | |
124 | if (pp.pval > 10000) { | |
125 | fprintf(stderr, "Illegal probability val 0x%x\n", pp.pval); | |
126 | return -1; | |
127 | } | |
128 | argc--; | |
129 | argv++; | |
130 | } else if (matches(*argv, "help") == 0) { | |
131 | usage(); | |
132 | } | |
133 | } | |
134 | #endif | |
135 | ||
136 | if (argc > 0) { | |
137 | if (matches(*argv, "index") == 0) { | |
138 | NEXT_ARG(); | |
139 | if (get_u32(&p.index, *argv, 10)) { | |
140 | fprintf(stderr, "Illegal \"index\"\n"); | |
141 | return -1; | |
142 | } | |
143 | argc--; | |
144 | argv++; | |
145 | ok++; | |
146 | } else if (matches(*argv, "help") == 0) { | |
147 | usage(); | |
148 | } | |
149 | } | |
150 | ||
151 | if (!ok) | |
152 | return -1; | |
153 | ||
154 | tail = NLMSG_TAIL(n); | |
155 | addattr_l(n, MAX_MSG, tca_id, NULL, 0); | |
156 | addattr_l(n, MAX_MSG, TCA_GACT_PARMS, &p, sizeof(p)); | |
157 | #ifdef CONFIG_GACT_PROB | |
158 | if (rd) { | |
159 | addattr_l(n, MAX_MSG, TCA_GACT_PROB, &pp, sizeof(pp)); | |
160 | } | |
161 | #endif | |
162 | tail->rta_len = (void *) NLMSG_TAIL(n) - (void *) tail; | |
163 | ||
164 | *argc_p = argc; | |
165 | *argv_p = argv; | |
166 | return 0; | |
167 | } | |
168 | ||
169 | static int | |
170 | print_gact(struct action_util *au, FILE * f, struct rtattr *arg) | |
171 | { | |
172 | #ifdef CONFIG_GACT_PROB | |
173 | struct tc_gact_p *pp = NULL; | |
174 | struct tc_gact_p pp_dummy; | |
175 | #endif | |
176 | struct tc_gact *p = NULL; | |
177 | struct rtattr *tb[TCA_GACT_MAX + 1]; | |
178 | ||
179 | if (arg == NULL) | |
180 | return -1; | |
181 | ||
182 | parse_rtattr_nested(tb, TCA_GACT_MAX, arg); | |
183 | ||
184 | if (tb[TCA_GACT_PARMS] == NULL) { | |
185 | fprintf(f, "[NULL gact parameters]"); | |
186 | return -1; | |
187 | } | |
188 | p = RTA_DATA(tb[TCA_GACT_PARMS]); | |
189 | ||
190 | fprintf(f, "gact "); | |
191 | print_action_control(f, "action ", p->action, ""); | |
192 | #ifdef CONFIG_GACT_PROB | |
193 | if (tb[TCA_GACT_PROB] != NULL) { | |
194 | pp = RTA_DATA(tb[TCA_GACT_PROB]); | |
195 | } else { | |
196 | /* need to keep consistent output */ | |
197 | memset(&pp_dummy, 0, sizeof(pp_dummy)); | |
198 | pp = &pp_dummy; | |
199 | } | |
200 | fprintf(f, "\n\t random type %s", prob_n2a(pp->ptype)); | |
201 | print_action_control(f, " ", pp->paction, " "); | |
202 | fprintf(f, "val %d", pp->pval); | |
203 | #endif | |
204 | fprintf(f, "\n\t index %u ref %d bind %d", p->index, p->refcnt, | |
205 | p->bindcnt); | |
206 | if (show_stats) { | |
207 | if (tb[TCA_GACT_TM]) { | |
208 | struct tcf_t *tm = RTA_DATA(tb[TCA_GACT_TM]); | |
209 | ||
210 | print_tm(f, tm); | |
211 | } | |
212 | } | |
213 | fprintf(f, "\n "); | |
214 | return 0; | |
215 | } | |
216 | ||
217 | struct action_util gact_action_util = { | |
218 | .id = "gact", | |
219 | .parse_aopt = parse_gact, | |
220 | .print_aopt = print_gact, | |
221 | }; |