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320e9f36 | 1 | |
2 | /* | |
7e3ce7b9 | 3 | * DEBUG: section 80 WCCP Support |
320e9f36 | 4 | * AUTHOR: Glenn Chisholm |
5 | * | |
2b6662ba | 6 | * SQUID Web Proxy Cache http://www.squid-cache.org/ |
320e9f36 | 7 | * ---------------------------------------------------------- |
8 | * | |
2b6662ba | 9 | * Squid is the result of efforts by numerous individuals from |
10 | * the Internet community; see the CONTRIBUTORS file for full | |
11 | * details. Many organizations have provided support for Squid's | |
12 | * development; see the SPONSORS file for full details. Squid is | |
13 | * Copyrighted (C) 2001 by the Regents of the University of | |
14 | * California; see the COPYRIGHT file for full details. Squid | |
15 | * incorporates software developed and/or copyrighted by other | |
16 | * sources; see the CREDITS file for full details. | |
320e9f36 | 17 | * |
18 | * This program is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation; either version 2 of the License, or | |
21 | * (at your option) any later version. | |
26ac0430 | 22 | * |
320e9f36 | 23 | * This program is distributed in the hope that it will be useful, |
24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26 | * GNU General Public License for more details. | |
26ac0430 | 27 | * |
320e9f36 | 28 | * You should have received a copy of the GNU General Public License |
29 | * along with this program; if not, write to the Free Software | |
30 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
31 | * | |
32 | */ | |
f7f3304a | 33 | #include "squid.h" |
320e9f36 | 34 | |
eb824054 | 35 | #if USE_WCCP |
f9b72e0c AJ |
36 | #include "comm.h" |
37 | #include "comm/Connection.h" | |
d841c88d | 38 | #include "comm/Loops.h" |
f9b72e0c | 39 | #include "event.h" |
4d5904f7 | 40 | #include "SquidConfig.h" |
582c2af2 | 41 | |
320e9f36 | 42 | #define WCCP_PORT 2048 |
320e9f36 | 43 | #define WCCP_REVISION 0 |
320e9f36 | 44 | #define WCCP_ACTIVE_CACHES 32 |
45 | #define WCCP_HASH_SIZE 32 | |
46 | #define WCCP_BUCKETS 256 | |
7e3ce7b9 | 47 | #define WCCP_CACHE_LEN 4 |
320e9f36 | 48 | |
49 | #define WCCP_HERE_I_AM 7 | |
50 | #define WCCP_I_SEE_YOU 8 | |
51 | #define WCCP_ASSIGN_BUCKET 9 | |
52 | ||
26ac0430 | 53 | struct wccp_here_i_am_t { |
320e9f36 | 54 | int type; |
55 | int version; | |
56 | int revision; | |
57 | char hash[WCCP_HASH_SIZE]; | |
58 | int reserved; | |
59 | int id; | |
60 | }; | |
61 | ||
26ac0430 | 62 | struct wccp_cache_entry_t { |
b7ac5457 | 63 | struct in_addr ip_addr; // WCCP on-the-wire in 32-bit IPv4-only. |
320e9f36 | 64 | int revision; |
ede4c165 | 65 | char hash[WCCP_HASH_SIZE]; |
320e9f36 | 66 | int reserved; |
67 | }; | |
68 | ||
26ac0430 | 69 | struct wccp_i_see_you_t { |
b7ac5457 AJ |
70 | int32_t type; |
71 | int32_t version; | |
72 | int32_t change; | |
73 | int32_t id; | |
74 | int32_t number; | |
62e76326 | 75 | |
320e9f36 | 76 | struct wccp_cache_entry_t wccp_cache_entry[WCCP_ACTIVE_CACHES]; |
77 | }; | |
78 | ||
26ac0430 | 79 | struct wccp_assign_bucket_t { |
f6308664 | 80 | int type; |
81 | int id; | |
82 | int number; | |
320e9f36 | 83 | }; |
84 | ||
0b0cfcf2 | 85 | static int theWccpConnection = -1; |
62e76326 | 86 | |
320e9f36 | 87 | static struct wccp_here_i_am_t wccp_here_i_am; |
62e76326 | 88 | |
b5b86e2c | 89 | static struct wccp_i_see_you_t wccp_i_see_you; |
eccaff9c | 90 | static int last_change; |
91 | static int last_id; | |
1addf64a | 92 | static int last_assign_buckets_change; |
908b22c4 | 93 | static unsigned int number_caches; |
62e76326 | 94 | |
b7ac5457 | 95 | static Ip::Address local_ip; |
b5b86e2c | 96 | |
1f38f50a | 97 | static PF wccpHandleUdp; |
98 | static int wccpLowestIP(void); | |
99 | static EVH wccpHereIam; | |
7e3ce7b9 | 100 | static void wccpAssignBuckets(void); |
320e9f36 | 101 | |
320e9f36 | 102 | /* |
103 | * The functions used during startup: | |
104 | * wccpInit | |
105 | * wccpConnectionOpen | |
106 | * wccpConnectionShutdown | |
107 | * wccpConnectionClose | |
108 | */ | |
109 | ||
110 | void | |
111 | wccpInit(void) | |
112 | { | |
bf8fe701 | 113 | debugs(80, 5, "wccpInit: Called"); |
320e9f36 | 114 | memset(&wccp_here_i_am, '\0', sizeof(wccp_here_i_am)); |
115 | wccp_here_i_am.type = htonl(WCCP_HERE_I_AM); | |
d20b1cd0 | 116 | wccp_here_i_am.version = htonl(Config.Wccp.version); |
f6308664 | 117 | wccp_here_i_am.revision = htonl(WCCP_REVISION); |
eccaff9c | 118 | last_change = 0; |
119 | last_id = 0; | |
1addf64a | 120 | last_assign_buckets_change = 0; |
eccaff9c | 121 | number_caches = 0; |
62e76326 | 122 | |
cc192b50 | 123 | if (!Config.Wccp.router.IsAnyAddr()) |
62e76326 | 124 | if (!eventFind(wccpHereIam, NULL)) |
125 | eventAdd("wccpHereIam", wccpHereIam, NULL, 5.0, 1); | |
320e9f36 | 126 | } |
127 | ||
128 | void | |
129 | wccpConnectionOpen(void) | |
130 | { | |
bf8fe701 | 131 | debugs(80, 5, "wccpConnectionOpen: Called"); |
62e76326 | 132 | |
cc192b50 | 133 | if (Config.Wccp.router.IsAnyAddr()) { |
76dc4ca3 | 134 | debugs(80, 2, "WCCPv1 disabled."); |
62e76326 | 135 | return; |
1f38f50a | 136 | } |
62e76326 | 137 | |
cc192b50 | 138 | if ( !Config.Wccp.router.SetIPv4() ) { |
30c48b1a | 139 | debugs(80, DBG_CRITICAL, "WCCPv1 Disabled. Router " << Config.Wccp.router << " is not an IPv4 address."); |
cc192b50 | 140 | return; |
141 | } | |
142 | ||
143 | if ( !Config.Wccp.address.SetIPv4() ) { | |
30c48b1a | 144 | debugs(80, DBG_CRITICAL, "WCCPv1 Disabled. Local address " << Config.Wccp.address << " is not an IPv4 address."); |
cc192b50 | 145 | return; |
146 | } | |
147 | ||
148 | Config.Wccp.address.SetPort(WCCP_PORT); | |
83fa0221 | 149 | Config.Wccp.router.SetPort(WCCP_PORT); |
cc192b50 | 150 | |
31be869c | 151 | theWccpConnection = comm_open_listener(SOCK_DGRAM, |
04f7fd38 AJ |
152 | IPPROTO_UDP, |
153 | Config.Wccp.address, | |
154 | COMM_NONBLOCKING, | |
155 | "WCCP Socket"); | |
62e76326 | 156 | |
0b0cfcf2 | 157 | if (theWccpConnection < 0) |
62e76326 | 158 | fatal("Cannot open WCCP Port"); |
159 | ||
d841c88d | 160 | Comm::SetSelect(theWccpConnection, COMM_SELECT_READ, wccpHandleUdp, NULL, 0); |
62e76326 | 161 | |
e0236918 | 162 | debugs(80, DBG_IMPORTANT, "Accepting WCCPv1 messages on " << Config.Wccp.address << ", FD " << theWccpConnection << "."); |
0b0cfcf2 | 163 | |
306bfbb2 | 164 | // Sadly WCCP only does IPv4 |
62e76326 | 165 | |
306bfbb2 AJ |
166 | struct sockaddr_in router; |
167 | Config.Wccp.router.GetSockAddr(router); | |
9055f14b | 168 | if (connect(theWccpConnection, (struct sockaddr*)&router, sizeof(router))) |
306bfbb2 | 169 | fatal("Unable to connect WCCP out socket"); |
62e76326 | 170 | |
306bfbb2 AJ |
171 | struct sockaddr_in local; |
172 | memset(&local, '\0', sizeof(local)); | |
173 | socklen_t slen = sizeof(local); | |
9055f14b | 174 | if (getsockname(theWccpConnection, (struct sockaddr*)&local, &slen)) |
62e76326 | 175 | fatal("Unable to getsockname on WCCP out socket"); |
176 | ||
306bfbb2 | 177 | local_ip = local; |
320e9f36 | 178 | } |
179 | ||
320e9f36 | 180 | void |
181 | wccpConnectionClose(void) | |
182 | { | |
0b0cfcf2 | 183 | if (theWccpConnection > -1) { |
e0236918 | 184 | debugs(80, DBG_IMPORTANT, "FD " << theWccpConnection << " Closing WCCPv1 socket"); |
0b0cfcf2 | 185 | comm_close(theWccpConnection); |
186 | theWccpConnection = -1; | |
320e9f36 | 187 | } |
188 | } | |
189 | ||
62e76326 | 190 | /* |
320e9f36 | 191 | * Functions for handling the requests. |
192 | */ | |
193 | ||
62e76326 | 194 | /* |
320e9f36 | 195 | * Accept the UDP packet |
f6308664 | 196 | */ |
1f38f50a | 197 | static void |
320e9f36 | 198 | wccpHandleUdp(int sock, void *not_used) |
f6308664 | 199 | { |
b7ac5457 | 200 | Ip::Address from; |
47ac1af3 | 201 | int len; |
320e9f36 | 202 | |
bf8fe701 | 203 | debugs(80, 6, "wccpHandleUdp: Called."); |
f6308664 | 204 | |
d841c88d | 205 | Comm::SetSelect(sock, COMM_SELECT_READ, wccpHandleUdp, NULL, 0); |
62e76326 | 206 | |
b5b86e2c | 207 | memset(&wccp_i_see_you, '\0', sizeof(wccp_i_see_you)); |
f6308664 | 208 | |
7d21986b | 209 | len = comm_udp_recvfrom(sock, |
62e76326 | 210 | (void *) &wccp_i_see_you, |
1205909e | 211 | sizeof(wccp_i_see_you), |
62e76326 | 212 | 0, |
cc192b50 | 213 | from); |
214 | debugs(80, 3, "wccpHandleUdp: " << len << " bytes WCCP pkt from " << from << | |
26ac0430 | 215 | ": type=" << |
bf8fe701 | 216 | (unsigned) ntohl(wccp_i_see_you.type) << ", version=" << |
217 | (unsigned) ntohl(wccp_i_see_you.version) << ", change=" << | |
218 | (unsigned) ntohl(wccp_i_see_you.change) << ", id=" << | |
219 | (unsigned) ntohl(wccp_i_see_you.id) << ", number=" << | |
220 | (unsigned) ntohl(wccp_i_see_you.number)); | |
62e76326 | 221 | |
b5b86e2c | 222 | if (len < 0) |
62e76326 | 223 | return; |
224 | ||
cc192b50 | 225 | if (from != Config.Wccp.router) |
62e76326 | 226 | return; |
227 | ||
e4049756 | 228 | if ((unsigned) ntohl(wccp_i_see_you.version) != (unsigned) Config.Wccp.version) |
62e76326 | 229 | return; |
230 | ||
b5b86e2c | 231 | if (ntohl(wccp_i_see_you.type) != WCCP_I_SEE_YOU) |
62e76326 | 232 | return; |
233 | ||
0b0cfcf2 | 234 | if (ntohl(wccp_i_see_you.number) > WCCP_ACTIVE_CACHES) { |
e0236918 | 235 | debugs(80, DBG_IMPORTANT, "Ignoring WCCP_I_SEE_YOU from " << |
cc192b50 | 236 | from << " with number of caches set to " << |
bf8fe701 | 237 | (int) ntohl(wccp_i_see_you.number)); |
238 | ||
eedab643 | 239 | return; |
240 | } | |
241 | ||
eccaff9c | 242 | last_id = wccp_i_see_you.id; |
eedab643 | 243 | |
eccaff9c | 244 | if ((0 == last_change) && (number_caches == (unsigned) ntohl(wccp_i_see_you.number))) { |
62e76326 | 245 | if (last_assign_buckets_change == wccp_i_see_you.change) { |
246 | /* | |
247 | * After a WCCP_ASSIGN_BUCKET message, the router should | |
248 | * update the change value. If not, maybe the route didn't | |
249 | * receive our WCCP_ASSIGN_BUCKET message, so send it again. | |
250 | * | |
251 | * Don't update change here. Instead, fall through to | |
252 | * the next block to call wccpAssignBuckets() again. | |
253 | */ | |
254 | (void) 0; | |
255 | } else { | |
eccaff9c | 256 | last_change = wccp_i_see_you.change; |
62e76326 | 257 | return; |
258 | } | |
b5b86e2c | 259 | } |
62e76326 | 260 | |
eccaff9c | 261 | if (last_change != wccp_i_see_you.change) { |
262 | last_change = wccp_i_see_you.change; | |
62e76326 | 263 | |
264 | if (wccpLowestIP() && wccp_i_see_you.number) { | |
eccaff9c | 265 | last_assign_buckets_change = last_change; |
62e76326 | 266 | wccpAssignBuckets(); |
267 | } | |
b5b86e2c | 268 | } |
269 | } | |
f6308664 | 270 | |
1f38f50a | 271 | static int |
272 | wccpLowestIP(void) | |
b5b86e2c | 273 | { |
908b22c4 | 274 | unsigned int loop; |
eccaff9c | 275 | int found = 0; |
62e76326 | 276 | |
eedab643 | 277 | /* |
278 | * We sanity checked wccp_i_see_you.number back in wccpHandleUdp() | |
279 | */ | |
280 | ||
14942edd | 281 | for (loop = 0; loop < (unsigned) ntohl(wccp_i_see_you.number); ++loop) { |
eedab643 | 282 | assert(loop < WCCP_ACTIVE_CACHES); |
283 | ||
185d5b63 | 284 | if (local_ip > wccp_i_see_you.wccp_cache_entry[loop].ip_addr) |
62e76326 | 285 | return 0; |
eccaff9c | 286 | |
b7ac5457 | 287 | if (local_ip == wccp_i_see_you.wccp_cache_entry[loop].ip_addr) |
eccaff9c | 288 | found = 1; |
f6308664 | 289 | } |
62e76326 | 290 | |
eccaff9c | 291 | return found; |
f6308664 | 292 | } |
320e9f36 | 293 | |
1f38f50a | 294 | static void |
320e9f36 | 295 | wccpHereIam(void *voidnotused) |
296 | { | |
bf8fe701 | 297 | debugs(80, 6, "wccpHereIam: Called"); |
320e9f36 | 298 | |
eccaff9c | 299 | wccp_here_i_am.id = last_id; |
0b0cfcf2 | 300 | comm_udp_send(theWccpConnection, |
62e76326 | 301 | &wccp_here_i_am, |
302 | sizeof(wccp_here_i_am), | |
303 | 0); | |
320e9f36 | 304 | |
1f38f50a | 305 | if (!eventFind(wccpHereIam, NULL)) |
62e76326 | 306 | eventAdd("wccpHereIam", wccpHereIam, NULL, 10.0, 1); |
320e9f36 | 307 | } |
308 | ||
1f38f50a | 309 | static void |
7e3ce7b9 | 310 | wccpAssignBuckets(void) |
320e9f36 | 311 | { |
62e76326 | 312 | |
7e3ce7b9 | 313 | struct wccp_assign_bucket_t *wccp_assign_bucket; |
314 | int wab_len; | |
315 | char *buckets; | |
9bc73deb | 316 | int buckets_per_cache; |
908b22c4 | 317 | unsigned int loop; |
1f38f50a | 318 | int bucket = 0; |
319 | int *caches; | |
7e3ce7b9 | 320 | int cache_len; |
1f38f50a | 321 | char *buf; |
320e9f36 | 322 | |
bf8fe701 | 323 | debugs(80, 6, "wccpAssignBuckets: Called"); |
b5b86e2c | 324 | number_caches = ntohl(wccp_i_see_you.number); |
62e76326 | 325 | |
eedab643 | 326 | assert(number_caches > 0); |
327 | assert(number_caches <= WCCP_ACTIVE_CACHES); | |
62e76326 | 328 | |
7e3ce7b9 | 329 | wab_len = sizeof(struct wccp_assign_bucket_t); |
62e76326 | 330 | |
7e3ce7b9 | 331 | cache_len = WCCP_CACHE_LEN * number_caches; |
332 | ||
908b22c4 | 333 | buf = (char *)xmalloc(wab_len + |
62e76326 | 334 | WCCP_BUCKETS + |
335 | cache_len); | |
336 | ||
7e3ce7b9 | 337 | wccp_assign_bucket = (struct wccp_assign_bucket_t *) buf; |
62e76326 | 338 | |
7e3ce7b9 | 339 | caches = (int *) (buf + wab_len); |
62e76326 | 340 | |
7e3ce7b9 | 341 | buckets = buf + wab_len + cache_len; |
342 | ||
55788a77 | 343 | memset(wccp_assign_bucket, '\0', sizeof(*wccp_assign_bucket)); |
62e76326 | 344 | |
7e3ce7b9 | 345 | memset(buckets, 0xFF, WCCP_BUCKETS); |
320e9f36 | 346 | |
9bc73deb | 347 | buckets_per_cache = WCCP_BUCKETS / number_caches; |
62e76326 | 348 | |
14942edd | 349 | for (loop = 0; loop < number_caches; ++loop) { |
62e76326 | 350 | int i; |
41d00cd3 | 351 | memcpy(&caches[loop], |
e34763f4 A |
352 | &wccp_i_see_you.wccp_cache_entry[loop].ip_addr, |
353 | sizeof(*caches)); | |
62e76326 | 354 | |
14942edd | 355 | for (i = 0; i < buckets_per_cache; ++i) { |
62e76326 | 356 | assert(bucket < WCCP_BUCKETS); |
14942edd FC |
357 | buckets[bucket] = loop; |
358 | ++bucket; | |
62e76326 | 359 | } |
320e9f36 | 360 | } |
62e76326 | 361 | |
994f613f | 362 | while (bucket < WCCP_BUCKETS) { |
14942edd FC |
363 | buckets[bucket] = number_caches - 1; |
364 | ++bucket; | |
994f613f | 365 | } |
62e76326 | 366 | |
7e3ce7b9 | 367 | wccp_assign_bucket->type = htonl(WCCP_ASSIGN_BUCKET); |
368 | wccp_assign_bucket->id = wccp_i_see_you.id; | |
369 | wccp_assign_bucket->number = wccp_i_see_you.number; | |
370 | ||
0b0cfcf2 | 371 | comm_udp_send(theWccpConnection, |
62e76326 | 372 | buf, |
373 | wab_len + WCCP_BUCKETS + cache_len, | |
374 | 0); | |
eccaff9c | 375 | last_change = 0; |
1f38f50a | 376 | xfree(buf); |
320e9f36 | 377 | } |
eb824054 | 378 | |
379 | #endif /* USE_WCCP */ |