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1 | /* | |
2 | * m_csum.c checksum updating action | |
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: Gregoire Baron <baronchon@n7mm.org> | |
10 | */ | |
11 | ||
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
14 | #include <string.h> | |
15 | #include <unistd.h> | |
16 | ||
17 | #include <linux/tc_act/tc_csum.h> | |
18 | ||
19 | #include "utils.h" | |
20 | #include "tc_util.h" | |
21 | ||
22 | static void | |
23 | explain(void) | |
24 | { | |
25 | fprintf(stderr, "Usage: ... csum <UPDATE>\n" | |
26 | "Where: UPDATE := <TARGET> [<UPDATE>]\n" | |
27 | " TARGET := { ip4h | icmp | igmp | tcp | udp | udplite | <SWEETS> }\n" | |
28 | " SWEETS := { and | or | \'+\' }\n"); | |
29 | } | |
30 | ||
31 | static void | |
32 | usage(void) | |
33 | { | |
34 | explain(); | |
35 | exit(-1); | |
36 | } | |
37 | ||
38 | static int | |
39 | parse_csum_args(int *argc_p, char ***argv_p, struct tc_csum *sel) | |
40 | { | |
41 | int argc = *argc_p; | |
42 | char **argv = *argv_p; | |
43 | ||
44 | if (argc <= 0) | |
45 | return -1; | |
46 | ||
47 | while (argc > 0) { | |
48 | if ((matches(*argv, "iph") == 0) || | |
49 | (matches(*argv, "ip4h") == 0) || | |
50 | (matches(*argv, "ipv4h") == 0)) | |
51 | sel->update_flags |= TCA_CSUM_UPDATE_FLAG_IPV4HDR; | |
52 | ||
53 | else if (matches(*argv, "icmp") == 0) | |
54 | sel->update_flags |= TCA_CSUM_UPDATE_FLAG_ICMP; | |
55 | ||
56 | else if (matches(*argv, "igmp") == 0) | |
57 | sel->update_flags |= TCA_CSUM_UPDATE_FLAG_IGMP; | |
58 | ||
59 | else if (matches(*argv, "tcp") == 0) | |
60 | sel->update_flags |= TCA_CSUM_UPDATE_FLAG_TCP; | |
61 | ||
62 | else if (matches(*argv, "udp") == 0) | |
63 | sel->update_flags |= TCA_CSUM_UPDATE_FLAG_UDP; | |
64 | ||
65 | else if (matches(*argv, "udplite") == 0) | |
66 | sel->update_flags |= TCA_CSUM_UPDATE_FLAG_UDPLITE; | |
67 | ||
68 | else if ((matches(*argv, "and") == 0) || | |
69 | (matches(*argv, "or") == 0) || | |
70 | (matches(*argv, "+") == 0)) | |
71 | ; /* just ignore: ... csum iph and tcp or udp */ | |
72 | else | |
73 | break; | |
74 | argc--; | |
75 | argv++; | |
76 | } | |
77 | ||
78 | *argc_p = argc; | |
79 | *argv_p = argv; | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
84 | static int | |
85 | parse_csum(struct action_util *a, int *argc_p, | |
86 | char ***argv_p, int tca_id, struct nlmsghdr *n) | |
87 | { | |
88 | struct tc_csum sel; | |
89 | ||
90 | int argc = *argc_p; | |
91 | char **argv = *argv_p; | |
92 | int ok = 0; | |
93 | struct rtattr *tail; | |
94 | ||
95 | memset(&sel, 0, sizeof(sel)); | |
96 | ||
97 | while (argc > 0) { | |
98 | if (matches(*argv, "csum") == 0) { | |
99 | NEXT_ARG(); | |
100 | if (parse_csum_args(&argc, &argv, &sel)) { | |
101 | fprintf(stderr, "Illegal csum construct (%s)\n", | |
102 | *argv); | |
103 | explain(); | |
104 | return -1; | |
105 | } | |
106 | ok++; | |
107 | continue; | |
108 | } else if (matches(*argv, "help") == 0) { | |
109 | usage(); | |
110 | } else { | |
111 | break; | |
112 | } | |
113 | } | |
114 | ||
115 | if (!ok) { | |
116 | explain(); | |
117 | return -1; | |
118 | } | |
119 | ||
120 | if (sel.update_flags == 0) { | |
121 | fprintf(stderr, "Illegal csum construct, empty <UPDATE> list\n"); | |
122 | return -1; | |
123 | } | |
124 | ||
125 | if (argc) { | |
126 | if (matches(*argv, "reclassify") == 0) { | |
127 | sel.action = TC_ACT_RECLASSIFY; | |
128 | argc--; | |
129 | argv++; | |
130 | } else if (matches(*argv, "pipe") == 0) { | |
131 | sel.action = TC_ACT_PIPE; | |
132 | argc--; | |
133 | argv++; | |
134 | } else if (matches(*argv, "drop") == 0 || | |
135 | matches(*argv, "shot") == 0) { | |
136 | sel.action = TC_ACT_SHOT; | |
137 | argc--; | |
138 | argv++; | |
139 | } else if (matches(*argv, "continue") == 0) { | |
140 | sel.action = TC_ACT_UNSPEC; | |
141 | argc--; | |
142 | argv++; | |
143 | } else if (matches(*argv, "pass") == 0 || | |
144 | matches(*argv, "ok") == 0) { | |
145 | sel.action = TC_ACT_OK; | |
146 | argc--; | |
147 | argv++; | |
148 | } | |
149 | } | |
150 | ||
151 | if (argc) { | |
152 | if (matches(*argv, "index") == 0) { | |
153 | NEXT_ARG(); | |
154 | if (get_u32(&sel.index, *argv, 10)) { | |
155 | fprintf(stderr, "Illegal \"index\" (%s) <csum>\n", | |
156 | *argv); | |
157 | return -1; | |
158 | } | |
159 | argc--; | |
160 | argv++; | |
161 | } | |
162 | } | |
163 | ||
164 | tail = NLMSG_TAIL(n); | |
165 | addattr_l(n, MAX_MSG, tca_id, NULL, 0); | |
166 | addattr_l(n, MAX_MSG, TCA_CSUM_PARMS, &sel, sizeof(sel)); | |
167 | tail->rta_len = (char *)NLMSG_TAIL(n) - (char *)tail; | |
168 | ||
169 | *argc_p = argc; | |
170 | *argv_p = argv; | |
171 | ||
172 | return 0; | |
173 | } | |
174 | ||
175 | static int | |
176 | print_csum(struct action_util *au, FILE *f, struct rtattr *arg) | |
177 | { | |
178 | struct tc_csum *sel; | |
179 | ||
180 | struct rtattr *tb[TCA_CSUM_MAX + 1]; | |
181 | ||
182 | char *uflag_1 = ""; | |
183 | char *uflag_2 = ""; | |
184 | char *uflag_3 = ""; | |
185 | char *uflag_4 = ""; | |
186 | char *uflag_5 = ""; | |
187 | char *uflag_6 = ""; | |
188 | ||
189 | SPRINT_BUF(action_buf); | |
190 | ||
191 | int uflag_count = 0; | |
192 | ||
193 | if (arg == NULL) | |
194 | return -1; | |
195 | ||
196 | parse_rtattr_nested(tb, TCA_CSUM_MAX, arg); | |
197 | ||
198 | if (tb[TCA_CSUM_PARMS] == NULL) { | |
199 | fprintf(f, "[NULL csum parameters]"); | |
200 | return -1; | |
201 | } | |
202 | sel = RTA_DATA(tb[TCA_CSUM_PARMS]); | |
203 | ||
204 | if (sel->update_flags & TCA_CSUM_UPDATE_FLAG_IPV4HDR) { | |
205 | uflag_1 = "iph"; | |
206 | uflag_count++; | |
207 | } | |
208 | #define CSUM_UFLAG_BUFFER(flag_buffer, flag_value, flag_string) \ | |
209 | do { \ | |
210 | if (sel->update_flags & flag_value) { \ | |
211 | flag_buffer = uflag_count > 0 ? \ | |
212 | ", " flag_string : flag_string; \ | |
213 | uflag_count++; \ | |
214 | } \ | |
215 | } while (0) | |
216 | CSUM_UFLAG_BUFFER(uflag_2, TCA_CSUM_UPDATE_FLAG_ICMP, "icmp"); | |
217 | CSUM_UFLAG_BUFFER(uflag_3, TCA_CSUM_UPDATE_FLAG_IGMP, "igmp"); | |
218 | CSUM_UFLAG_BUFFER(uflag_4, TCA_CSUM_UPDATE_FLAG_TCP, "tcp"); | |
219 | CSUM_UFLAG_BUFFER(uflag_5, TCA_CSUM_UPDATE_FLAG_UDP, "udp"); | |
220 | CSUM_UFLAG_BUFFER(uflag_6, TCA_CSUM_UPDATE_FLAG_UDPLITE, "udplite"); | |
221 | if (!uflag_count) { | |
222 | uflag_1 = "?empty"; | |
223 | } | |
224 | ||
225 | fprintf(f, "csum (%s%s%s%s%s%s) action %s\n", | |
226 | uflag_1, uflag_2, uflag_3, | |
227 | uflag_4, uflag_5, uflag_6, | |
228 | action_n2a(sel->action, action_buf, sizeof(action_buf))); | |
229 | fprintf(f, "\tindex %d ref %d bind %d", sel->index, sel->refcnt, sel->bindcnt); | |
230 | ||
231 | if (show_stats) { | |
232 | if (tb[TCA_CSUM_TM]) { | |
233 | struct tcf_t *tm = RTA_DATA(tb[TCA_CSUM_TM]); | |
234 | ||
235 | print_tm(f, tm); | |
236 | } | |
237 | } | |
238 | fprintf(f, "\n"); | |
239 | ||
240 | return 0; | |
241 | } | |
242 | ||
243 | struct action_util csum_action_util = { | |
244 | .id = "csum", | |
245 | .parse_aopt = parse_csum, | |
246 | .print_aopt = print_csum, | |
247 | }; |