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320e9f36 | 1 | /* |
bbc27441 | 2 | * Copyright (C) 1996-2014 The Squid Software Foundation and contributors |
320e9f36 | 3 | * |
bbc27441 AJ |
4 | * Squid software is distributed under GPLv2+ license and includes |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
320e9f36 | 7 | */ |
bbc27441 AJ |
8 | |
9 | /* DEBUG: section 80 WCCP Support */ | |
10 | ||
f7f3304a | 11 | #include "squid.h" |
320e9f36 | 12 | |
eb824054 | 13 | #if USE_WCCP |
f9b72e0c AJ |
14 | #include "comm.h" |
15 | #include "comm/Connection.h" | |
d841c88d | 16 | #include "comm/Loops.h" |
f9b72e0c | 17 | #include "event.h" |
4d5904f7 | 18 | #include "SquidConfig.h" |
582c2af2 | 19 | |
320e9f36 | 20 | #define WCCP_PORT 2048 |
320e9f36 | 21 | #define WCCP_REVISION 0 |
320e9f36 | 22 | #define WCCP_ACTIVE_CACHES 32 |
23 | #define WCCP_HASH_SIZE 32 | |
24 | #define WCCP_BUCKETS 256 | |
7e3ce7b9 | 25 | #define WCCP_CACHE_LEN 4 |
320e9f36 | 26 | |
27 | #define WCCP_HERE_I_AM 7 | |
28 | #define WCCP_I_SEE_YOU 8 | |
29 | #define WCCP_ASSIGN_BUCKET 9 | |
30 | ||
26ac0430 | 31 | struct wccp_here_i_am_t { |
320e9f36 | 32 | int type; |
33 | int version; | |
34 | int revision; | |
35 | char hash[WCCP_HASH_SIZE]; | |
36 | int reserved; | |
37 | int id; | |
38 | }; | |
39 | ||
26ac0430 | 40 | struct wccp_cache_entry_t { |
b7ac5457 | 41 | struct in_addr ip_addr; // WCCP on-the-wire in 32-bit IPv4-only. |
320e9f36 | 42 | int revision; |
ede4c165 | 43 | char hash[WCCP_HASH_SIZE]; |
320e9f36 | 44 | int reserved; |
45 | }; | |
46 | ||
26ac0430 | 47 | struct wccp_i_see_you_t { |
b7ac5457 AJ |
48 | int32_t type; |
49 | int32_t version; | |
50 | int32_t change; | |
51 | int32_t id; | |
52 | int32_t number; | |
62e76326 | 53 | |
320e9f36 | 54 | struct wccp_cache_entry_t wccp_cache_entry[WCCP_ACTIVE_CACHES]; |
55 | }; | |
56 | ||
26ac0430 | 57 | struct wccp_assign_bucket_t { |
f6308664 | 58 | int type; |
59 | int id; | |
60 | int number; | |
320e9f36 | 61 | }; |
62 | ||
0b0cfcf2 | 63 | static int theWccpConnection = -1; |
62e76326 | 64 | |
320e9f36 | 65 | static struct wccp_here_i_am_t wccp_here_i_am; |
62e76326 | 66 | |
b5b86e2c | 67 | static struct wccp_i_see_you_t wccp_i_see_you; |
eccaff9c | 68 | static int last_change; |
69 | static int last_id; | |
1addf64a | 70 | static int last_assign_buckets_change; |
908b22c4 | 71 | static unsigned int number_caches; |
62e76326 | 72 | |
b7ac5457 | 73 | static Ip::Address local_ip; |
b5b86e2c | 74 | |
1f38f50a | 75 | static PF wccpHandleUdp; |
76 | static int wccpLowestIP(void); | |
77 | static EVH wccpHereIam; | |
7e3ce7b9 | 78 | static void wccpAssignBuckets(void); |
320e9f36 | 79 | |
320e9f36 | 80 | /* |
81 | * The functions used during startup: | |
82 | * wccpInit | |
83 | * wccpConnectionOpen | |
84 | * wccpConnectionShutdown | |
85 | * wccpConnectionClose | |
86 | */ | |
87 | ||
88 | void | |
89 | wccpInit(void) | |
90 | { | |
bf8fe701 | 91 | debugs(80, 5, "wccpInit: Called"); |
320e9f36 | 92 | memset(&wccp_here_i_am, '\0', sizeof(wccp_here_i_am)); |
93 | wccp_here_i_am.type = htonl(WCCP_HERE_I_AM); | |
d20b1cd0 | 94 | wccp_here_i_am.version = htonl(Config.Wccp.version); |
f6308664 | 95 | wccp_here_i_am.revision = htonl(WCCP_REVISION); |
eccaff9c | 96 | last_change = 0; |
97 | last_id = 0; | |
1addf64a | 98 | last_assign_buckets_change = 0; |
eccaff9c | 99 | number_caches = 0; |
62e76326 | 100 | |
4dd643d5 | 101 | if (!Config.Wccp.router.isAnyAddr()) |
62e76326 | 102 | if (!eventFind(wccpHereIam, NULL)) |
103 | eventAdd("wccpHereIam", wccpHereIam, NULL, 5.0, 1); | |
320e9f36 | 104 | } |
105 | ||
106 | void | |
107 | wccpConnectionOpen(void) | |
108 | { | |
bf8fe701 | 109 | debugs(80, 5, "wccpConnectionOpen: Called"); |
62e76326 | 110 | |
4dd643d5 | 111 | if (Config.Wccp.router.isAnyAddr()) { |
76dc4ca3 | 112 | debugs(80, 2, "WCCPv1 disabled."); |
62e76326 | 113 | return; |
1f38f50a | 114 | } |
62e76326 | 115 | |
4dd643d5 | 116 | if ( !Config.Wccp.router.setIPv4() ) { |
30c48b1a | 117 | debugs(80, DBG_CRITICAL, "WCCPv1 Disabled. Router " << Config.Wccp.router << " is not an IPv4 address."); |
cc192b50 | 118 | return; |
119 | } | |
120 | ||
4dd643d5 | 121 | if ( !Config.Wccp.address.setIPv4() ) { |
30c48b1a | 122 | debugs(80, DBG_CRITICAL, "WCCPv1 Disabled. Local address " << Config.Wccp.address << " is not an IPv4 address."); |
cc192b50 | 123 | return; |
124 | } | |
125 | ||
4dd643d5 AJ |
126 | Config.Wccp.address.port(WCCP_PORT); |
127 | Config.Wccp.router.port(WCCP_PORT); | |
cc192b50 | 128 | |
31be869c | 129 | theWccpConnection = comm_open_listener(SOCK_DGRAM, |
04f7fd38 AJ |
130 | IPPROTO_UDP, |
131 | Config.Wccp.address, | |
132 | COMM_NONBLOCKING, | |
133 | "WCCP Socket"); | |
62e76326 | 134 | |
0b0cfcf2 | 135 | if (theWccpConnection < 0) |
62e76326 | 136 | fatal("Cannot open WCCP Port"); |
137 | ||
d841c88d | 138 | Comm::SetSelect(theWccpConnection, COMM_SELECT_READ, wccpHandleUdp, NULL, 0); |
62e76326 | 139 | |
e0236918 | 140 | debugs(80, DBG_IMPORTANT, "Accepting WCCPv1 messages on " << Config.Wccp.address << ", FD " << theWccpConnection << "."); |
0b0cfcf2 | 141 | |
306bfbb2 | 142 | // Sadly WCCP only does IPv4 |
62e76326 | 143 | |
306bfbb2 | 144 | struct sockaddr_in router; |
4dd643d5 | 145 | Config.Wccp.router.getSockAddr(router); |
9055f14b | 146 | if (connect(theWccpConnection, (struct sockaddr*)&router, sizeof(router))) |
306bfbb2 | 147 | fatal("Unable to connect WCCP out socket"); |
62e76326 | 148 | |
306bfbb2 AJ |
149 | struct sockaddr_in local; |
150 | memset(&local, '\0', sizeof(local)); | |
151 | socklen_t slen = sizeof(local); | |
9055f14b | 152 | if (getsockname(theWccpConnection, (struct sockaddr*)&local, &slen)) |
62e76326 | 153 | fatal("Unable to getsockname on WCCP out socket"); |
154 | ||
306bfbb2 | 155 | local_ip = local; |
320e9f36 | 156 | } |
157 | ||
320e9f36 | 158 | void |
159 | wccpConnectionClose(void) | |
160 | { | |
0b0cfcf2 | 161 | if (theWccpConnection > -1) { |
e0236918 | 162 | debugs(80, DBG_IMPORTANT, "FD " << theWccpConnection << " Closing WCCPv1 socket"); |
0b0cfcf2 | 163 | comm_close(theWccpConnection); |
164 | theWccpConnection = -1; | |
320e9f36 | 165 | } |
166 | } | |
167 | ||
62e76326 | 168 | /* |
320e9f36 | 169 | * Functions for handling the requests. |
170 | */ | |
171 | ||
62e76326 | 172 | /* |
320e9f36 | 173 | * Accept the UDP packet |
f6308664 | 174 | */ |
1f38f50a | 175 | static void |
320e9f36 | 176 | wccpHandleUdp(int sock, void *not_used) |
f6308664 | 177 | { |
b7ac5457 | 178 | Ip::Address from; |
47ac1af3 | 179 | int len; |
320e9f36 | 180 | |
bf8fe701 | 181 | debugs(80, 6, "wccpHandleUdp: Called."); |
f6308664 | 182 | |
d841c88d | 183 | Comm::SetSelect(sock, COMM_SELECT_READ, wccpHandleUdp, NULL, 0); |
62e76326 | 184 | |
b5b86e2c | 185 | memset(&wccp_i_see_you, '\0', sizeof(wccp_i_see_you)); |
f6308664 | 186 | |
7d21986b | 187 | len = comm_udp_recvfrom(sock, |
62e76326 | 188 | (void *) &wccp_i_see_you, |
1205909e | 189 | sizeof(wccp_i_see_you), |
62e76326 | 190 | 0, |
cc192b50 | 191 | from); |
192 | debugs(80, 3, "wccpHandleUdp: " << len << " bytes WCCP pkt from " << from << | |
26ac0430 | 193 | ": type=" << |
bf8fe701 | 194 | (unsigned) ntohl(wccp_i_see_you.type) << ", version=" << |
195 | (unsigned) ntohl(wccp_i_see_you.version) << ", change=" << | |
196 | (unsigned) ntohl(wccp_i_see_you.change) << ", id=" << | |
197 | (unsigned) ntohl(wccp_i_see_you.id) << ", number=" << | |
198 | (unsigned) ntohl(wccp_i_see_you.number)); | |
62e76326 | 199 | |
b5b86e2c | 200 | if (len < 0) |
62e76326 | 201 | return; |
202 | ||
cc192b50 | 203 | if (from != Config.Wccp.router) |
62e76326 | 204 | return; |
205 | ||
e4049756 | 206 | if ((unsigned) ntohl(wccp_i_see_you.version) != (unsigned) Config.Wccp.version) |
62e76326 | 207 | return; |
208 | ||
b5b86e2c | 209 | if (ntohl(wccp_i_see_you.type) != WCCP_I_SEE_YOU) |
62e76326 | 210 | return; |
211 | ||
0b0cfcf2 | 212 | if (ntohl(wccp_i_see_you.number) > WCCP_ACTIVE_CACHES) { |
e0236918 | 213 | debugs(80, DBG_IMPORTANT, "Ignoring WCCP_I_SEE_YOU from " << |
cc192b50 | 214 | from << " with number of caches set to " << |
bf8fe701 | 215 | (int) ntohl(wccp_i_see_you.number)); |
216 | ||
eedab643 | 217 | return; |
218 | } | |
219 | ||
eccaff9c | 220 | last_id = wccp_i_see_you.id; |
eedab643 | 221 | |
eccaff9c | 222 | if ((0 == last_change) && (number_caches == (unsigned) ntohl(wccp_i_see_you.number))) { |
62e76326 | 223 | if (last_assign_buckets_change == wccp_i_see_you.change) { |
224 | /* | |
225 | * After a WCCP_ASSIGN_BUCKET message, the router should | |
226 | * update the change value. If not, maybe the route didn't | |
227 | * receive our WCCP_ASSIGN_BUCKET message, so send it again. | |
228 | * | |
229 | * Don't update change here. Instead, fall through to | |
230 | * the next block to call wccpAssignBuckets() again. | |
231 | */ | |
232 | (void) 0; | |
233 | } else { | |
eccaff9c | 234 | last_change = wccp_i_see_you.change; |
62e76326 | 235 | return; |
236 | } | |
b5b86e2c | 237 | } |
62e76326 | 238 | |
eccaff9c | 239 | if (last_change != wccp_i_see_you.change) { |
240 | last_change = wccp_i_see_you.change; | |
62e76326 | 241 | |
242 | if (wccpLowestIP() && wccp_i_see_you.number) { | |
eccaff9c | 243 | last_assign_buckets_change = last_change; |
62e76326 | 244 | wccpAssignBuckets(); |
245 | } | |
b5b86e2c | 246 | } |
247 | } | |
f6308664 | 248 | |
1f38f50a | 249 | static int |
250 | wccpLowestIP(void) | |
b5b86e2c | 251 | { |
908b22c4 | 252 | unsigned int loop; |
eccaff9c | 253 | int found = 0; |
62e76326 | 254 | |
eedab643 | 255 | /* |
256 | * We sanity checked wccp_i_see_you.number back in wccpHandleUdp() | |
257 | */ | |
258 | ||
14942edd | 259 | for (loop = 0; loop < (unsigned) ntohl(wccp_i_see_you.number); ++loop) { |
eedab643 | 260 | assert(loop < WCCP_ACTIVE_CACHES); |
261 | ||
185d5b63 | 262 | if (local_ip > wccp_i_see_you.wccp_cache_entry[loop].ip_addr) |
62e76326 | 263 | return 0; |
eccaff9c | 264 | |
b7ac5457 | 265 | if (local_ip == wccp_i_see_you.wccp_cache_entry[loop].ip_addr) |
eccaff9c | 266 | found = 1; |
f6308664 | 267 | } |
62e76326 | 268 | |
eccaff9c | 269 | return found; |
f6308664 | 270 | } |
320e9f36 | 271 | |
1f38f50a | 272 | static void |
320e9f36 | 273 | wccpHereIam(void *voidnotused) |
274 | { | |
bf8fe701 | 275 | debugs(80, 6, "wccpHereIam: Called"); |
320e9f36 | 276 | |
eccaff9c | 277 | wccp_here_i_am.id = last_id; |
182106f3 AJ |
278 | double interval = 10.0; // TODO: make this configurable, possibly negotiate with the router. |
279 | errno = 0; | |
280 | ssize_t sent = comm_udp_send(theWccpConnection, &wccp_here_i_am, sizeof(wccp_here_i_am), 0); | |
281 | ||
282 | // if we failed to send the whole lot, try again at a shorter interval (20%) | |
283 | if (sent != sizeof(wccp_here_i_am)) { | |
bca20999 | 284 | debugs(80, 2, "ERROR: failed to send WCCP HERE_I_AM packet: " << xstrerror()); |
182106f3 AJ |
285 | interval = 2.0; |
286 | } | |
320e9f36 | 287 | |
1f38f50a | 288 | if (!eventFind(wccpHereIam, NULL)) |
182106f3 | 289 | eventAdd("wccpHereIam", wccpHereIam, NULL, interval, 1); |
320e9f36 | 290 | } |
291 | ||
1f38f50a | 292 | static void |
7e3ce7b9 | 293 | wccpAssignBuckets(void) |
320e9f36 | 294 | { |
62e76326 | 295 | |
7e3ce7b9 | 296 | struct wccp_assign_bucket_t *wccp_assign_bucket; |
297 | int wab_len; | |
298 | char *buckets; | |
9bc73deb | 299 | int buckets_per_cache; |
908b22c4 | 300 | unsigned int loop; |
1f38f50a | 301 | int bucket = 0; |
302 | int *caches; | |
7e3ce7b9 | 303 | int cache_len; |
1f38f50a | 304 | char *buf; |
320e9f36 | 305 | |
bf8fe701 | 306 | debugs(80, 6, "wccpAssignBuckets: Called"); |
b5b86e2c | 307 | number_caches = ntohl(wccp_i_see_you.number); |
62e76326 | 308 | |
eedab643 | 309 | assert(number_caches > 0); |
310 | assert(number_caches <= WCCP_ACTIVE_CACHES); | |
62e76326 | 311 | |
7e3ce7b9 | 312 | wab_len = sizeof(struct wccp_assign_bucket_t); |
62e76326 | 313 | |
7e3ce7b9 | 314 | cache_len = WCCP_CACHE_LEN * number_caches; |
315 | ||
908b22c4 | 316 | buf = (char *)xmalloc(wab_len + |
62e76326 | 317 | WCCP_BUCKETS + |
318 | cache_len); | |
319 | ||
7e3ce7b9 | 320 | wccp_assign_bucket = (struct wccp_assign_bucket_t *) buf; |
62e76326 | 321 | |
7e3ce7b9 | 322 | caches = (int *) (buf + wab_len); |
62e76326 | 323 | |
7e3ce7b9 | 324 | buckets = buf + wab_len + cache_len; |
325 | ||
55788a77 | 326 | memset(wccp_assign_bucket, '\0', sizeof(*wccp_assign_bucket)); |
62e76326 | 327 | |
7e3ce7b9 | 328 | memset(buckets, 0xFF, WCCP_BUCKETS); |
320e9f36 | 329 | |
9bc73deb | 330 | buckets_per_cache = WCCP_BUCKETS / number_caches; |
62e76326 | 331 | |
14942edd | 332 | for (loop = 0; loop < number_caches; ++loop) { |
62e76326 | 333 | int i; |
41d00cd3 | 334 | memcpy(&caches[loop], |
e34763f4 A |
335 | &wccp_i_see_you.wccp_cache_entry[loop].ip_addr, |
336 | sizeof(*caches)); | |
62e76326 | 337 | |
14942edd | 338 | for (i = 0; i < buckets_per_cache; ++i) { |
62e76326 | 339 | assert(bucket < WCCP_BUCKETS); |
14942edd FC |
340 | buckets[bucket] = loop; |
341 | ++bucket; | |
62e76326 | 342 | } |
320e9f36 | 343 | } |
62e76326 | 344 | |
994f613f | 345 | while (bucket < WCCP_BUCKETS) { |
14942edd FC |
346 | buckets[bucket] = number_caches - 1; |
347 | ++bucket; | |
994f613f | 348 | } |
62e76326 | 349 | |
7e3ce7b9 | 350 | wccp_assign_bucket->type = htonl(WCCP_ASSIGN_BUCKET); |
351 | wccp_assign_bucket->id = wccp_i_see_you.id; | |
352 | wccp_assign_bucket->number = wccp_i_see_you.number; | |
353 | ||
0b0cfcf2 | 354 | comm_udp_send(theWccpConnection, |
62e76326 | 355 | buf, |
356 | wab_len + WCCP_BUCKETS + cache_len, | |
357 | 0); | |
eccaff9c | 358 | last_change = 0; |
1f38f50a | 359 | xfree(buf); |
320e9f36 | 360 | } |
eb824054 | 361 | |
362 | #endif /* USE_WCCP */ |