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320e9f36 | 1 | |
2 | /* | |
76dc4ca3 | 3 | * $Id: wccp.cc,v 1.44 2007/08/08 14:47:41 rousskov Exp $ |
320e9f36 | 4 | * |
7e3ce7b9 | 5 | * DEBUG: section 80 WCCP Support |
320e9f36 | 6 | * AUTHOR: Glenn Chisholm |
7 | * | |
2b6662ba | 8 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
320e9f36 | 9 | * ---------------------------------------------------------- |
10 | * | |
2b6662ba | 11 | * Squid is the result of efforts by numerous individuals from |
12 | * the Internet community; see the CONTRIBUTORS file for full | |
13 | * details. Many organizations have provided support for Squid's | |
14 | * development; see the SPONSORS file for full details. Squid is | |
15 | * Copyrighted (C) 2001 by the Regents of the University of | |
16 | * California; see the COPYRIGHT file for full details. Squid | |
17 | * incorporates software developed and/or copyrighted by other | |
18 | * sources; see the CREDITS file for full details. | |
320e9f36 | 19 | * |
20 | * This program is free software; you can redistribute it and/or modify | |
21 | * it under the terms of the GNU General Public License as published by | |
22 | * the Free Software Foundation; either version 2 of the License, or | |
23 | * (at your option) any later version. | |
2b6662ba | 24 | * |
320e9f36 | 25 | * This program is distributed in the hope that it will be useful, |
26 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28 | * GNU General Public License for more details. | |
2b6662ba | 29 | * |
320e9f36 | 30 | * You should have received a copy of the GNU General Public License |
31 | * along with this program; if not, write to the Free Software | |
32 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
33 | * | |
34 | */ | |
35 | #include "squid.h" | |
063dc1eb | 36 | #include "comm.h" |
a553a5a3 | 37 | #include "event.h" |
320e9f36 | 38 | |
eb824054 | 39 | #if USE_WCCP |
40 | ||
320e9f36 | 41 | #define WCCP_PORT 2048 |
320e9f36 | 42 | #define WCCP_REVISION 0 |
320e9f36 | 43 | #define WCCP_ACTIVE_CACHES 32 |
44 | #define WCCP_HASH_SIZE 32 | |
45 | #define WCCP_BUCKETS 256 | |
7e3ce7b9 | 46 | #define WCCP_CACHE_LEN 4 |
320e9f36 | 47 | |
48 | #define WCCP_HERE_I_AM 7 | |
49 | #define WCCP_I_SEE_YOU 8 | |
50 | #define WCCP_ASSIGN_BUCKET 9 | |
51 | ||
62e76326 | 52 | struct wccp_here_i_am_t |
53 | { | |
320e9f36 | 54 | int type; |
55 | int version; | |
56 | int revision; | |
57 | char hash[WCCP_HASH_SIZE]; | |
58 | int reserved; | |
59 | int id; | |
60 | }; | |
61 | ||
62e76326 | 62 | struct wccp_cache_entry_t |
63 | { | |
64 | ||
ddfcbc22 | 65 | struct IN_ADDR ip_addr; |
320e9f36 | 66 | int revision; |
ede4c165 | 67 | char hash[WCCP_HASH_SIZE]; |
320e9f36 | 68 | int reserved; |
69 | }; | |
70 | ||
62e76326 | 71 | struct wccp_i_see_you_t |
72 | { | |
320e9f36 | 73 | int type; |
74 | int version; | |
75 | int change; | |
76 | int id; | |
77 | int number; | |
62e76326 | 78 | |
320e9f36 | 79 | struct wccp_cache_entry_t wccp_cache_entry[WCCP_ACTIVE_CACHES]; |
80 | }; | |
81 | ||
62e76326 | 82 | struct wccp_assign_bucket_t |
83 | { | |
f6308664 | 84 | int type; |
85 | int id; | |
86 | int number; | |
320e9f36 | 87 | }; |
88 | ||
0b0cfcf2 | 89 | static int theWccpConnection = -1; |
62e76326 | 90 | |
320e9f36 | 91 | static struct wccp_here_i_am_t wccp_here_i_am; |
62e76326 | 92 | |
b5b86e2c | 93 | static struct wccp_i_see_you_t wccp_i_see_you; |
eccaff9c | 94 | static int last_change; |
95 | static int last_id; | |
1addf64a | 96 | static int last_assign_buckets_change; |
908b22c4 | 97 | static unsigned int number_caches; |
62e76326 | 98 | |
ddfcbc22 | 99 | static struct IN_ADDR local_ip; |
b5b86e2c | 100 | |
1f38f50a | 101 | static PF wccpHandleUdp; |
102 | static int wccpLowestIP(void); | |
103 | static EVH wccpHereIam; | |
7e3ce7b9 | 104 | static void wccpAssignBuckets(void); |
320e9f36 | 105 | |
320e9f36 | 106 | /* |
107 | * The functions used during startup: | |
108 | * wccpInit | |
109 | * wccpConnectionOpen | |
110 | * wccpConnectionShutdown | |
111 | * wccpConnectionClose | |
112 | */ | |
113 | ||
114 | void | |
115 | wccpInit(void) | |
116 | { | |
bf8fe701 | 117 | debugs(80, 5, "wccpInit: Called"); |
320e9f36 | 118 | memset(&wccp_here_i_am, '\0', sizeof(wccp_here_i_am)); |
119 | wccp_here_i_am.type = htonl(WCCP_HERE_I_AM); | |
d20b1cd0 | 120 | wccp_here_i_am.version = htonl(Config.Wccp.version); |
f6308664 | 121 | wccp_here_i_am.revision = htonl(WCCP_REVISION); |
eccaff9c | 122 | last_change = 0; |
123 | last_id = 0; | |
1addf64a | 124 | last_assign_buckets_change = 0; |
eccaff9c | 125 | number_caches = 0; |
62e76326 | 126 | |
1f38f50a | 127 | if (Config.Wccp.router.s_addr != any_addr.s_addr) |
62e76326 | 128 | if (!eventFind(wccpHereIam, NULL)) |
129 | eventAdd("wccpHereIam", wccpHereIam, NULL, 5.0, 1); | |
320e9f36 | 130 | } |
131 | ||
132 | void | |
133 | wccpConnectionOpen(void) | |
134 | { | |
135 | u_short port = WCCP_PORT; | |
62e76326 | 136 | |
b5b86e2c | 137 | struct sockaddr_in router, local; |
908b22c4 | 138 | socklen_t local_len, router_len; |
bf8fe701 | 139 | debugs(80, 5, "wccpConnectionOpen: Called"); |
62e76326 | 140 | |
1f38f50a | 141 | if (Config.Wccp.router.s_addr == any_addr.s_addr) { |
76dc4ca3 | 142 | debugs(80, 2, "WCCPv1 disabled."); |
62e76326 | 143 | return; |
1f38f50a | 144 | } |
62e76326 | 145 | |
0b0cfcf2 | 146 | theWccpConnection = comm_open(SOCK_DGRAM, |
147 | IPPROTO_UDP, | |
148 | Config.Wccp.address, | |
149 | port, | |
150 | COMM_NONBLOCKING, | |
151 | "WCCP Socket"); | |
62e76326 | 152 | |
0b0cfcf2 | 153 | if (theWccpConnection < 0) |
62e76326 | 154 | fatal("Cannot open WCCP Port"); |
155 | ||
0b0cfcf2 | 156 | commSetSelect(theWccpConnection, |
62e76326 | 157 | COMM_SELECT_READ, |
158 | wccpHandleUdp, | |
159 | NULL, | |
160 | 0); | |
161 | ||
76dc4ca3 | 162 | debugs(80, 1, "Accepting WCCPv1 messages on port " << port << ", FD " << theWccpConnection << "."); |
62e76326 | 163 | |
62e76326 | 164 | |
b5b86e2c | 165 | router_len = sizeof(router); |
0b0cfcf2 | 166 | |
b5b86e2c | 167 | memset(&router, '\0', router_len); |
0b0cfcf2 | 168 | |
b5b86e2c | 169 | router.sin_family = AF_INET; |
0b0cfcf2 | 170 | |
1f38f50a | 171 | router.sin_port = htons(port); |
0b0cfcf2 | 172 | |
ede4c165 | 173 | router.sin_addr = Config.Wccp.router; |
62e76326 | 174 | |
0b0cfcf2 | 175 | if (connect(theWccpConnection, (struct sockaddr *) &router, router_len)) |
62e76326 | 176 | fatal("Unable to connect WCCP out socket"); |
177 | ||
ede4c165 | 178 | local_len = sizeof(local); |
62e76326 | 179 | |
b5b86e2c | 180 | memset(&local, '\0', local_len); |
62e76326 | 181 | |
0b0cfcf2 | 182 | if (getsockname(theWccpConnection, (struct sockaddr *) &local, &local_len)) |
62e76326 | 183 | fatal("Unable to getsockname on WCCP out socket"); |
184 | ||
1f38f50a | 185 | local_ip.s_addr = local.sin_addr.s_addr; |
320e9f36 | 186 | } |
187 | ||
320e9f36 | 188 | |
189 | void | |
190 | wccpConnectionClose(void) | |
191 | { | |
0b0cfcf2 | 192 | if (theWccpConnection > -1) { |
76dc4ca3 | 193 | debugs(80, 1, "FD " << theWccpConnection << " Closing WCCPv1 socket"); |
0b0cfcf2 | 194 | comm_close(theWccpConnection); |
195 | theWccpConnection = -1; | |
320e9f36 | 196 | } |
197 | } | |
198 | ||
62e76326 | 199 | /* |
320e9f36 | 200 | * Functions for handling the requests. |
201 | */ | |
202 | ||
62e76326 | 203 | /* |
320e9f36 | 204 | * Accept the UDP packet |
f6308664 | 205 | */ |
1f38f50a | 206 | static void |
320e9f36 | 207 | wccpHandleUdp(int sock, void *not_used) |
f6308664 | 208 | { |
62e76326 | 209 | |
320e9f36 | 210 | struct sockaddr_in from; |
f6308664 | 211 | socklen_t from_len; |
47ac1af3 | 212 | int len; |
320e9f36 | 213 | |
bf8fe701 | 214 | debugs(80, 6, "wccpHandleUdp: Called."); |
f6308664 | 215 | |
320e9f36 | 216 | commSetSelect(sock, COMM_SELECT_READ, wccpHandleUdp, NULL, 0); |
62e76326 | 217 | |
320e9f36 | 218 | from_len = sizeof(struct sockaddr_in); |
219 | memset(&from, '\0', from_len); | |
b5b86e2c | 220 | memset(&wccp_i_see_you, '\0', sizeof(wccp_i_see_you)); |
f6308664 | 221 | |
7d21986b | 222 | len = comm_udp_recvfrom(sock, |
62e76326 | 223 | (void *) &wccp_i_see_you, |
1205909e | 224 | sizeof(wccp_i_see_you), |
62e76326 | 225 | 0, |
226 | ||
227 | (struct sockaddr *) &from, | |
228 | &from_len); | |
bf8fe701 | 229 | debugs(80, 3, "wccpHandleUdp: " << len << " bytes WCCP pkt from " << |
230 | inet_ntoa(from.sin_addr) << ": type=" << | |
231 | (unsigned) ntohl(wccp_i_see_you.type) << ", version=" << | |
232 | (unsigned) ntohl(wccp_i_see_you.version) << ", change=" << | |
233 | (unsigned) ntohl(wccp_i_see_you.change) << ", id=" << | |
234 | (unsigned) ntohl(wccp_i_see_you.id) << ", number=" << | |
235 | (unsigned) ntohl(wccp_i_see_you.number)); | |
62e76326 | 236 | |
b5b86e2c | 237 | if (len < 0) |
62e76326 | 238 | return; |
239 | ||
ede4c165 | 240 | if (Config.Wccp.router.s_addr != from.sin_addr.s_addr) |
62e76326 | 241 | return; |
242 | ||
e4049756 | 243 | if ((unsigned) ntohl(wccp_i_see_you.version) != (unsigned) Config.Wccp.version) |
62e76326 | 244 | return; |
245 | ||
b5b86e2c | 246 | if (ntohl(wccp_i_see_you.type) != WCCP_I_SEE_YOU) |
62e76326 | 247 | return; |
248 | ||
0b0cfcf2 | 249 | if (ntohl(wccp_i_see_you.number) > WCCP_ACTIVE_CACHES) { |
bf8fe701 | 250 | debugs(80, 1, "Ignoring WCCP_I_SEE_YOU from " << |
251 | inet_ntoa(from.sin_addr) << " with number of caches set to " << | |
252 | (int) ntohl(wccp_i_see_you.number)); | |
253 | ||
eedab643 | 254 | return; |
255 | } | |
256 | ||
eccaff9c | 257 | last_id = wccp_i_see_you.id; |
eedab643 | 258 | |
eccaff9c | 259 | if ((0 == last_change) && (number_caches == (unsigned) ntohl(wccp_i_see_you.number))) { |
62e76326 | 260 | if (last_assign_buckets_change == wccp_i_see_you.change) { |
261 | /* | |
262 | * After a WCCP_ASSIGN_BUCKET message, the router should | |
263 | * update the change value. If not, maybe the route didn't | |
264 | * receive our WCCP_ASSIGN_BUCKET message, so send it again. | |
265 | * | |
266 | * Don't update change here. Instead, fall through to | |
267 | * the next block to call wccpAssignBuckets() again. | |
268 | */ | |
269 | (void) 0; | |
270 | } else { | |
eccaff9c | 271 | last_change = wccp_i_see_you.change; |
62e76326 | 272 | return; |
273 | } | |
b5b86e2c | 274 | } |
62e76326 | 275 | |
eccaff9c | 276 | if (last_change != wccp_i_see_you.change) { |
277 | last_change = wccp_i_see_you.change; | |
62e76326 | 278 | |
279 | if (wccpLowestIP() && wccp_i_see_you.number) { | |
eccaff9c | 280 | last_assign_buckets_change = last_change; |
62e76326 | 281 | wccpAssignBuckets(); |
282 | } | |
b5b86e2c | 283 | } |
284 | } | |
f6308664 | 285 | |
1f38f50a | 286 | static int |
287 | wccpLowestIP(void) | |
b5b86e2c | 288 | { |
908b22c4 | 289 | unsigned int loop; |
eccaff9c | 290 | int found = 0; |
62e76326 | 291 | |
eedab643 | 292 | /* |
293 | * We sanity checked wccp_i_see_you.number back in wccpHandleUdp() | |
294 | */ | |
295 | ||
e4049756 | 296 | for (loop = 0; loop < (unsigned) ntohl(wccp_i_see_you.number); loop++) { |
eedab643 | 297 | assert(loop < WCCP_ACTIVE_CACHES); |
298 | ||
62e76326 | 299 | if (wccp_i_see_you.wccp_cache_entry[loop].ip_addr.s_addr < local_ip.s_addr) |
300 | return 0; | |
eccaff9c | 301 | |
302 | if (wccp_i_see_you.wccp_cache_entry[loop].ip_addr.s_addr == local_ip.s_addr) | |
303 | found = 1; | |
f6308664 | 304 | } |
62e76326 | 305 | |
eccaff9c | 306 | return found; |
f6308664 | 307 | } |
320e9f36 | 308 | |
1f38f50a | 309 | static void |
320e9f36 | 310 | wccpHereIam(void *voidnotused) |
311 | { | |
bf8fe701 | 312 | debugs(80, 6, "wccpHereIam: Called"); |
320e9f36 | 313 | |
eccaff9c | 314 | wccp_here_i_am.id = last_id; |
0b0cfcf2 | 315 | comm_udp_send(theWccpConnection, |
62e76326 | 316 | &wccp_here_i_am, |
317 | sizeof(wccp_here_i_am), | |
318 | 0); | |
320e9f36 | 319 | |
1f38f50a | 320 | if (!eventFind(wccpHereIam, NULL)) |
62e76326 | 321 | eventAdd("wccpHereIam", wccpHereIam, NULL, 10.0, 1); |
320e9f36 | 322 | } |
323 | ||
1f38f50a | 324 | static void |
7e3ce7b9 | 325 | wccpAssignBuckets(void) |
320e9f36 | 326 | { |
62e76326 | 327 | |
7e3ce7b9 | 328 | struct wccp_assign_bucket_t *wccp_assign_bucket; |
329 | int wab_len; | |
330 | char *buckets; | |
9bc73deb | 331 | int buckets_per_cache; |
908b22c4 | 332 | unsigned int loop; |
1f38f50a | 333 | int bucket = 0; |
334 | int *caches; | |
7e3ce7b9 | 335 | int cache_len; |
1f38f50a | 336 | char *buf; |
320e9f36 | 337 | |
bf8fe701 | 338 | debugs(80, 6, "wccpAssignBuckets: Called"); |
b5b86e2c | 339 | number_caches = ntohl(wccp_i_see_you.number); |
62e76326 | 340 | |
eedab643 | 341 | assert(number_caches > 0); |
342 | assert(number_caches <= WCCP_ACTIVE_CACHES); | |
62e76326 | 343 | |
7e3ce7b9 | 344 | wab_len = sizeof(struct wccp_assign_bucket_t); |
62e76326 | 345 | |
7e3ce7b9 | 346 | cache_len = WCCP_CACHE_LEN * number_caches; |
347 | ||
908b22c4 | 348 | buf = (char *)xmalloc(wab_len + |
62e76326 | 349 | WCCP_BUCKETS + |
350 | cache_len); | |
351 | ||
7e3ce7b9 | 352 | wccp_assign_bucket = (struct wccp_assign_bucket_t *) buf; |
62e76326 | 353 | |
7e3ce7b9 | 354 | caches = (int *) (buf + wab_len); |
62e76326 | 355 | |
7e3ce7b9 | 356 | buckets = buf + wab_len + cache_len; |
357 | ||
358 | memset(wccp_assign_bucket, '\0', sizeof(wccp_assign_bucket)); | |
62e76326 | 359 | |
7e3ce7b9 | 360 | memset(buckets, 0xFF, WCCP_BUCKETS); |
320e9f36 | 361 | |
9bc73deb | 362 | buckets_per_cache = WCCP_BUCKETS / number_caches; |
62e76326 | 363 | |
f6308664 | 364 | for (loop = 0; loop < number_caches; loop++) { |
62e76326 | 365 | int i; |
366 | xmemcpy(&caches[loop], | |
367 | &wccp_i_see_you.wccp_cache_entry[loop].ip_addr.s_addr, | |
368 | sizeof(*caches)); | |
369 | ||
370 | for (i = 0; i < buckets_per_cache; i++) { | |
371 | assert(bucket < WCCP_BUCKETS); | |
372 | buckets[bucket++] = loop; | |
373 | } | |
320e9f36 | 374 | } |
62e76326 | 375 | |
994f613f | 376 | while (bucket < WCCP_BUCKETS) { |
62e76326 | 377 | buckets[bucket++] = number_caches - 1; |
994f613f | 378 | } |
62e76326 | 379 | |
7e3ce7b9 | 380 | wccp_assign_bucket->type = htonl(WCCP_ASSIGN_BUCKET); |
381 | wccp_assign_bucket->id = wccp_i_see_you.id; | |
382 | wccp_assign_bucket->number = wccp_i_see_you.number; | |
383 | ||
0b0cfcf2 | 384 | comm_udp_send(theWccpConnection, |
62e76326 | 385 | buf, |
386 | wab_len + WCCP_BUCKETS + cache_len, | |
387 | 0); | |
eccaff9c | 388 | last_change = 0; |
1f38f50a | 389 | xfree(buf); |
320e9f36 | 390 | } |
eb824054 | 391 | |
392 | #endif /* USE_WCCP */ |