Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ip_vs_app.c: Application module support for IPVS |
| 3 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * Authors: Wensong Zhang <wensong@linuxvirtualserver.org> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
| 11 | * Most code here is taken from ip_masq_app.c in kernel 2.2. The difference |
| 12 | * is that ip_vs_app module handles the reverse direction (incoming requests |
| 13 | * and outgoing responses). |
| 14 | * |
| 15 | * IP_MASQ_APP application masquerading module |
| 16 | * |
| 17 | * Author: Juan Jose Ciarlante, <jjciarla@raiz.uncu.edu.ar> |
| 18 | * |
| 19 | */ |
| 20 | |
Hannes Eder | 9aada7a | 2009-07-30 14:29:44 -0700 | [diff] [blame] | 21 | #define KMSG_COMPONENT "IPVS" |
| 22 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/module.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/skbuff.h> |
| 27 | #include <linux/in.h> |
| 28 | #include <linux/ip.h> |
Herbert Xu | af1e1cf | 2007-10-14 00:39:33 -0700 | [diff] [blame] | 29 | #include <linux/netfilter.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 30 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <net/protocol.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 32 | #include <net/tcp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <asm/system.h> |
| 34 | #include <linux/stat.h> |
| 35 | #include <linux/proc_fs.h> |
| 36 | #include <linux/seq_file.h> |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 37 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | #include <net/ip_vs.h> |
| 40 | |
| 41 | EXPORT_SYMBOL(register_ip_vs_app); |
| 42 | EXPORT_SYMBOL(unregister_ip_vs_app); |
| 43 | EXPORT_SYMBOL(register_ip_vs_app_inc); |
| 44 | |
| 45 | /* ipvs application list head */ |
| 46 | static LIST_HEAD(ip_vs_app_list); |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 47 | static DEFINE_MUTEX(__ip_vs_app_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
| 49 | |
| 50 | /* |
| 51 | * Get an ip_vs_app object |
| 52 | */ |
| 53 | static inline int ip_vs_app_get(struct ip_vs_app *app) |
| 54 | { |
Pavel Emelyanov | 85b6068 | 2007-11-19 22:52:41 -0800 | [diff] [blame] | 55 | return try_module_get(app->module); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | } |
| 57 | |
| 58 | |
| 59 | static inline void ip_vs_app_put(struct ip_vs_app *app) |
| 60 | { |
Pavel Emelyanov | 85b6068 | 2007-11-19 22:52:41 -0800 | [diff] [blame] | 61 | module_put(app->module); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | } |
| 63 | |
| 64 | |
| 65 | /* |
| 66 | * Allocate/initialize app incarnation and register it in proto apps. |
| 67 | */ |
| 68 | static int |
| 69 | ip_vs_app_inc_new(struct ip_vs_app *app, __u16 proto, __u16 port) |
| 70 | { |
| 71 | struct ip_vs_protocol *pp; |
| 72 | struct ip_vs_app *inc; |
| 73 | int ret; |
| 74 | |
| 75 | if (!(pp = ip_vs_proto_get(proto))) |
| 76 | return -EPROTONOSUPPORT; |
| 77 | |
| 78 | if (!pp->unregister_app) |
| 79 | return -EOPNOTSUPP; |
| 80 | |
Arnaldo Carvalho de Melo | 8b2ed4b | 2006-11-21 01:17:18 -0200 | [diff] [blame] | 81 | inc = kmemdup(app, sizeof(*inc), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | if (!inc) |
| 83 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | INIT_LIST_HEAD(&inc->p_list); |
| 85 | INIT_LIST_HEAD(&inc->incs_list); |
| 86 | inc->app = app; |
| 87 | inc->port = htons(port); |
| 88 | atomic_set(&inc->usecnt, 0); |
| 89 | |
| 90 | if (app->timeouts) { |
| 91 | inc->timeout_table = |
| 92 | ip_vs_create_timeout_table(app->timeouts, |
| 93 | app->timeouts_size); |
| 94 | if (!inc->timeout_table) { |
| 95 | ret = -ENOMEM; |
| 96 | goto out; |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | ret = pp->register_app(inc); |
| 101 | if (ret) |
| 102 | goto out; |
| 103 | |
| 104 | list_add(&inc->a_list, &app->incs_list); |
| 105 | IP_VS_DBG(9, "%s application %s:%u registered\n", |
| 106 | pp->name, inc->name, inc->port); |
| 107 | |
| 108 | return 0; |
| 109 | |
| 110 | out: |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 111 | kfree(inc->timeout_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | kfree(inc); |
| 113 | return ret; |
| 114 | } |
| 115 | |
| 116 | |
| 117 | /* |
| 118 | * Release app incarnation |
| 119 | */ |
| 120 | static void |
| 121 | ip_vs_app_inc_release(struct ip_vs_app *inc) |
| 122 | { |
| 123 | struct ip_vs_protocol *pp; |
| 124 | |
| 125 | if (!(pp = ip_vs_proto_get(inc->protocol))) |
| 126 | return; |
| 127 | |
| 128 | if (pp->unregister_app) |
| 129 | pp->unregister_app(inc); |
| 130 | |
| 131 | IP_VS_DBG(9, "%s App %s:%u unregistered\n", |
| 132 | pp->name, inc->name, inc->port); |
| 133 | |
| 134 | list_del(&inc->a_list); |
| 135 | |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 136 | kfree(inc->timeout_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | kfree(inc); |
| 138 | } |
| 139 | |
| 140 | |
| 141 | /* |
| 142 | * Get reference to app inc (only called from softirq) |
| 143 | * |
| 144 | */ |
| 145 | int ip_vs_app_inc_get(struct ip_vs_app *inc) |
| 146 | { |
| 147 | int result; |
| 148 | |
| 149 | atomic_inc(&inc->usecnt); |
| 150 | if (unlikely((result = ip_vs_app_get(inc->app)) != 1)) |
| 151 | atomic_dec(&inc->usecnt); |
| 152 | return result; |
| 153 | } |
| 154 | |
| 155 | |
| 156 | /* |
| 157 | * Put the app inc (only called from timer or net softirq) |
| 158 | */ |
| 159 | void ip_vs_app_inc_put(struct ip_vs_app *inc) |
| 160 | { |
| 161 | ip_vs_app_put(inc->app); |
| 162 | atomic_dec(&inc->usecnt); |
| 163 | } |
| 164 | |
| 165 | |
| 166 | /* |
| 167 | * Register an application incarnation in protocol applications |
| 168 | */ |
| 169 | int |
| 170 | register_ip_vs_app_inc(struct ip_vs_app *app, __u16 proto, __u16 port) |
| 171 | { |
| 172 | int result; |
| 173 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 174 | mutex_lock(&__ip_vs_app_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | |
| 176 | result = ip_vs_app_inc_new(app, proto, port); |
| 177 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 178 | mutex_unlock(&__ip_vs_app_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | |
| 180 | return result; |
| 181 | } |
| 182 | |
| 183 | |
| 184 | /* |
| 185 | * ip_vs_app registration routine |
| 186 | */ |
| 187 | int register_ip_vs_app(struct ip_vs_app *app) |
| 188 | { |
| 189 | /* increase the module use count */ |
| 190 | ip_vs_use_count_inc(); |
| 191 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 192 | mutex_lock(&__ip_vs_app_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
| 194 | list_add(&app->a_list, &ip_vs_app_list); |
| 195 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 196 | mutex_unlock(&__ip_vs_app_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | |
| 198 | return 0; |
| 199 | } |
| 200 | |
| 201 | |
| 202 | /* |
| 203 | * ip_vs_app unregistration routine |
| 204 | * We are sure there are no app incarnations attached to services |
| 205 | */ |
| 206 | void unregister_ip_vs_app(struct ip_vs_app *app) |
| 207 | { |
| 208 | struct ip_vs_app *inc, *nxt; |
| 209 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 210 | mutex_lock(&__ip_vs_app_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | |
| 212 | list_for_each_entry_safe(inc, nxt, &app->incs_list, a_list) { |
| 213 | ip_vs_app_inc_release(inc); |
| 214 | } |
| 215 | |
| 216 | list_del(&app->a_list); |
| 217 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 218 | mutex_unlock(&__ip_vs_app_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
| 220 | /* decrease the module use count */ |
| 221 | ip_vs_use_count_dec(); |
| 222 | } |
| 223 | |
| 224 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | /* |
| 226 | * Bind ip_vs_conn to its ip_vs_app (called by cp constructor) |
| 227 | */ |
| 228 | int ip_vs_bind_app(struct ip_vs_conn *cp, struct ip_vs_protocol *pp) |
| 229 | { |
| 230 | return pp->app_conn_bind(cp); |
| 231 | } |
| 232 | |
| 233 | |
| 234 | /* |
| 235 | * Unbind cp from application incarnation (called by cp destructor) |
| 236 | */ |
| 237 | void ip_vs_unbind_app(struct ip_vs_conn *cp) |
| 238 | { |
| 239 | struct ip_vs_app *inc = cp->app; |
| 240 | |
| 241 | if (!inc) |
| 242 | return; |
| 243 | |
| 244 | if (inc->unbind_conn) |
| 245 | inc->unbind_conn(inc, cp); |
| 246 | if (inc->done_conn) |
| 247 | inc->done_conn(inc, cp); |
| 248 | ip_vs_app_inc_put(inc); |
| 249 | cp->app = NULL; |
| 250 | } |
| 251 | |
| 252 | |
| 253 | /* |
| 254 | * Fixes th->seq based on ip_vs_seq info. |
| 255 | */ |
| 256 | static inline void vs_fix_seq(const struct ip_vs_seq *vseq, struct tcphdr *th) |
| 257 | { |
| 258 | __u32 seq = ntohl(th->seq); |
| 259 | |
| 260 | /* |
| 261 | * Adjust seq with delta-offset for all packets after |
| 262 | * the most recent resized pkt seq and with previous_delta offset |
| 263 | * for all packets before most recent resized pkt seq. |
| 264 | */ |
| 265 | if (vseq->delta || vseq->previous_delta) { |
| 266 | if(after(seq, vseq->init_seq)) { |
| 267 | th->seq = htonl(seq + vseq->delta); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 268 | IP_VS_DBG(9, "%s(): added delta (%d) to seq\n", |
| 269 | __func__, vseq->delta); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | } else { |
| 271 | th->seq = htonl(seq + vseq->previous_delta); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 272 | IP_VS_DBG(9, "%s(): added previous_delta (%d) to seq\n", |
| 273 | __func__, vseq->previous_delta); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | } |
| 275 | } |
| 276 | } |
| 277 | |
| 278 | |
| 279 | /* |
| 280 | * Fixes th->ack_seq based on ip_vs_seq info. |
| 281 | */ |
| 282 | static inline void |
| 283 | vs_fix_ack_seq(const struct ip_vs_seq *vseq, struct tcphdr *th) |
| 284 | { |
| 285 | __u32 ack_seq = ntohl(th->ack_seq); |
| 286 | |
| 287 | /* |
| 288 | * Adjust ack_seq with delta-offset for |
| 289 | * the packets AFTER most recent resized pkt has caused a shift |
| 290 | * for packets before most recent resized pkt, use previous_delta |
| 291 | */ |
| 292 | if (vseq->delta || vseq->previous_delta) { |
| 293 | /* since ack_seq is the number of octet that is expected |
| 294 | to receive next, so compare it with init_seq+delta */ |
| 295 | if(after(ack_seq, vseq->init_seq+vseq->delta)) { |
| 296 | th->ack_seq = htonl(ack_seq - vseq->delta); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 297 | IP_VS_DBG(9, "%s(): subtracted delta " |
| 298 | "(%d) from ack_seq\n", __func__, vseq->delta); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | |
| 300 | } else { |
| 301 | th->ack_seq = htonl(ack_seq - vseq->previous_delta); |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 302 | IP_VS_DBG(9, "%s(): subtracted " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | "previous_delta (%d) from ack_seq\n", |
Hannes Eder | 1e3e238 | 2009-08-02 11:05:41 +0000 | [diff] [blame] | 304 | __func__, vseq->previous_delta); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | } |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | |
| 310 | /* |
| 311 | * Updates ip_vs_seq if pkt has been resized |
| 312 | * Assumes already checked proto==IPPROTO_TCP and diff!=0. |
| 313 | */ |
| 314 | static inline void vs_seq_update(struct ip_vs_conn *cp, struct ip_vs_seq *vseq, |
| 315 | unsigned flag, __u32 seq, int diff) |
| 316 | { |
| 317 | /* spinlock is to keep updating cp->flags atomic */ |
| 318 | spin_lock(&cp->lock); |
| 319 | if (!(cp->flags & flag) || after(seq, vseq->init_seq)) { |
| 320 | vseq->previous_delta = vseq->delta; |
| 321 | vseq->delta += diff; |
| 322 | vseq->init_seq = seq; |
| 323 | cp->flags |= flag; |
| 324 | } |
| 325 | spin_unlock(&cp->lock); |
| 326 | } |
| 327 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 328 | static inline int app_tcp_pkt_out(struct ip_vs_conn *cp, struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | struct ip_vs_app *app) |
| 330 | { |
| 331 | int diff; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 332 | const unsigned int tcp_offset = ip_hdrlen(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | struct tcphdr *th; |
| 334 | __u32 seq; |
| 335 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 336 | if (!skb_make_writable(skb, tcp_offset + sizeof(*th))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | return 0; |
| 338 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 339 | th = (struct tcphdr *)(skb_network_header(skb) + tcp_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | |
| 341 | /* |
| 342 | * Remember seq number in case this pkt gets resized |
| 343 | */ |
| 344 | seq = ntohl(th->seq); |
| 345 | |
| 346 | /* |
| 347 | * Fix seq stuff if flagged as so. |
| 348 | */ |
| 349 | if (cp->flags & IP_VS_CONN_F_OUT_SEQ) |
| 350 | vs_fix_seq(&cp->out_seq, th); |
| 351 | if (cp->flags & IP_VS_CONN_F_IN_SEQ) |
| 352 | vs_fix_ack_seq(&cp->in_seq, th); |
| 353 | |
| 354 | /* |
| 355 | * Call private output hook function |
| 356 | */ |
| 357 | if (app->pkt_out == NULL) |
| 358 | return 1; |
| 359 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 360 | if (!app->pkt_out(app, cp, skb, &diff)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | return 0; |
| 362 | |
| 363 | /* |
| 364 | * Update ip_vs seq stuff if len has changed. |
| 365 | */ |
| 366 | if (diff != 0) |
| 367 | vs_seq_update(cp, &cp->out_seq, |
| 368 | IP_VS_CONN_F_OUT_SEQ, seq, diff); |
| 369 | |
| 370 | return 1; |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * Output pkt hook. Will call bound ip_vs_app specific function |
| 375 | * called by ipvs packet handler, assumes previously checked cp!=NULL |
| 376 | * returns false if it can't handle packet (oom) |
| 377 | */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 378 | int ip_vs_app_pkt_out(struct ip_vs_conn *cp, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | { |
| 380 | struct ip_vs_app *app; |
| 381 | |
| 382 | /* |
| 383 | * check if application module is bound to |
| 384 | * this ip_vs_conn. |
| 385 | */ |
| 386 | if ((app = cp->app) == NULL) |
| 387 | return 1; |
| 388 | |
| 389 | /* TCP is complicated */ |
| 390 | if (cp->protocol == IPPROTO_TCP) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 391 | return app_tcp_pkt_out(cp, skb, app); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | |
| 393 | /* |
| 394 | * Call private output hook function |
| 395 | */ |
| 396 | if (app->pkt_out == NULL) |
| 397 | return 1; |
| 398 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 399 | return app->pkt_out(app, cp, skb, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 403 | static inline int app_tcp_pkt_in(struct ip_vs_conn *cp, struct sk_buff *skb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | struct ip_vs_app *app) |
| 405 | { |
| 406 | int diff; |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 407 | const unsigned int tcp_offset = ip_hdrlen(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | struct tcphdr *th; |
| 409 | __u32 seq; |
| 410 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 411 | if (!skb_make_writable(skb, tcp_offset + sizeof(*th))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | return 0; |
| 413 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 414 | th = (struct tcphdr *)(skb_network_header(skb) + tcp_offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | |
| 416 | /* |
| 417 | * Remember seq number in case this pkt gets resized |
| 418 | */ |
| 419 | seq = ntohl(th->seq); |
| 420 | |
| 421 | /* |
| 422 | * Fix seq stuff if flagged as so. |
| 423 | */ |
| 424 | if (cp->flags & IP_VS_CONN_F_IN_SEQ) |
| 425 | vs_fix_seq(&cp->in_seq, th); |
| 426 | if (cp->flags & IP_VS_CONN_F_OUT_SEQ) |
| 427 | vs_fix_ack_seq(&cp->out_seq, th); |
| 428 | |
| 429 | /* |
| 430 | * Call private input hook function |
| 431 | */ |
| 432 | if (app->pkt_in == NULL) |
| 433 | return 1; |
| 434 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 435 | if (!app->pkt_in(app, cp, skb, &diff)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | return 0; |
| 437 | |
| 438 | /* |
| 439 | * Update ip_vs seq stuff if len has changed. |
| 440 | */ |
| 441 | if (diff != 0) |
| 442 | vs_seq_update(cp, &cp->in_seq, |
| 443 | IP_VS_CONN_F_IN_SEQ, seq, diff); |
| 444 | |
| 445 | return 1; |
| 446 | } |
| 447 | |
| 448 | /* |
| 449 | * Input pkt hook. Will call bound ip_vs_app specific function |
| 450 | * called by ipvs packet handler, assumes previously checked cp!=NULL. |
| 451 | * returns false if can't handle packet (oom). |
| 452 | */ |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 453 | int ip_vs_app_pkt_in(struct ip_vs_conn *cp, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | { |
| 455 | struct ip_vs_app *app; |
| 456 | |
| 457 | /* |
| 458 | * check if application module is bound to |
| 459 | * this ip_vs_conn. |
| 460 | */ |
| 461 | if ((app = cp->app) == NULL) |
| 462 | return 1; |
| 463 | |
| 464 | /* TCP is complicated */ |
| 465 | if (cp->protocol == IPPROTO_TCP) |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 466 | return app_tcp_pkt_in(cp, skb, app); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | |
| 468 | /* |
| 469 | * Call private input hook function |
| 470 | */ |
| 471 | if (app->pkt_in == NULL) |
| 472 | return 1; |
| 473 | |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 474 | return app->pkt_in(app, cp, skb, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | } |
| 476 | |
| 477 | |
| 478 | #ifdef CONFIG_PROC_FS |
| 479 | /* |
| 480 | * /proc/net/ip_vs_app entry function |
| 481 | */ |
| 482 | |
| 483 | static struct ip_vs_app *ip_vs_app_idx(loff_t pos) |
| 484 | { |
| 485 | struct ip_vs_app *app, *inc; |
| 486 | |
| 487 | list_for_each_entry(app, &ip_vs_app_list, a_list) { |
| 488 | list_for_each_entry(inc, &app->incs_list, a_list) { |
| 489 | if (pos-- == 0) |
| 490 | return inc; |
| 491 | } |
| 492 | } |
| 493 | return NULL; |
| 494 | |
| 495 | } |
| 496 | |
| 497 | static void *ip_vs_app_seq_start(struct seq_file *seq, loff_t *pos) |
| 498 | { |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 499 | mutex_lock(&__ip_vs_app_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | |
| 501 | return *pos ? ip_vs_app_idx(*pos - 1) : SEQ_START_TOKEN; |
| 502 | } |
| 503 | |
| 504 | static void *ip_vs_app_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 505 | { |
| 506 | struct ip_vs_app *inc, *app; |
| 507 | struct list_head *e; |
| 508 | |
| 509 | ++*pos; |
| 510 | if (v == SEQ_START_TOKEN) |
| 511 | return ip_vs_app_idx(0); |
| 512 | |
| 513 | inc = v; |
| 514 | app = inc->app; |
| 515 | |
| 516 | if ((e = inc->a_list.next) != &app->incs_list) |
| 517 | return list_entry(e, struct ip_vs_app, a_list); |
| 518 | |
| 519 | /* go on to next application */ |
| 520 | for (e = app->a_list.next; e != &ip_vs_app_list; e = e->next) { |
| 521 | app = list_entry(e, struct ip_vs_app, a_list); |
| 522 | list_for_each_entry(inc, &app->incs_list, a_list) { |
| 523 | return inc; |
| 524 | } |
| 525 | } |
| 526 | return NULL; |
| 527 | } |
| 528 | |
| 529 | static void ip_vs_app_seq_stop(struct seq_file *seq, void *v) |
| 530 | { |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 531 | mutex_unlock(&__ip_vs_app_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | } |
| 533 | |
| 534 | static int ip_vs_app_seq_show(struct seq_file *seq, void *v) |
| 535 | { |
| 536 | if (v == SEQ_START_TOKEN) |
| 537 | seq_puts(seq, "prot port usecnt name\n"); |
| 538 | else { |
| 539 | const struct ip_vs_app *inc = v; |
| 540 | |
| 541 | seq_printf(seq, "%-3s %-7u %-6d %-17s\n", |
| 542 | ip_vs_proto_name(inc->protocol), |
| 543 | ntohs(inc->port), |
| 544 | atomic_read(&inc->usecnt), |
| 545 | inc->name); |
| 546 | } |
| 547 | return 0; |
| 548 | } |
| 549 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 550 | static const struct seq_operations ip_vs_app_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | .start = ip_vs_app_seq_start, |
| 552 | .next = ip_vs_app_seq_next, |
| 553 | .stop = ip_vs_app_seq_stop, |
| 554 | .show = ip_vs_app_seq_show, |
| 555 | }; |
| 556 | |
| 557 | static int ip_vs_app_open(struct inode *inode, struct file *file) |
| 558 | { |
| 559 | return seq_open(file, &ip_vs_app_seq_ops); |
| 560 | } |
| 561 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 562 | static const struct file_operations ip_vs_app_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | .owner = THIS_MODULE, |
| 564 | .open = ip_vs_app_open, |
| 565 | .read = seq_read, |
| 566 | .llseek = seq_lseek, |
| 567 | .release = seq_release, |
| 568 | }; |
| 569 | #endif |
| 570 | |
| 571 | |
| 572 | /* |
| 573 | * Replace a segment of data with a new segment |
| 574 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 575 | int ip_vs_skb_replace(struct sk_buff *skb, gfp_t pri, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | char *o_buf, int o_len, char *n_buf, int n_len) |
| 577 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | int diff; |
| 579 | int o_offset; |
| 580 | int o_left; |
| 581 | |
| 582 | EnterFunction(9); |
| 583 | |
| 584 | diff = n_len - o_len; |
| 585 | o_offset = o_buf - (char *)skb->data; |
| 586 | /* The length of left data after o_buf+o_len in the skb data */ |
| 587 | o_left = skb->len - (o_offset + o_len); |
| 588 | |
| 589 | if (diff <= 0) { |
| 590 | memmove(o_buf + n_len, o_buf + o_len, o_left); |
| 591 | memcpy(o_buf, n_buf, n_len); |
| 592 | skb_trim(skb, skb->len + diff); |
| 593 | } else if (diff <= skb_tailroom(skb)) { |
| 594 | skb_put(skb, diff); |
| 595 | memmove(o_buf + n_len, o_buf + o_len, o_left); |
| 596 | memcpy(o_buf, n_buf, n_len); |
| 597 | } else { |
| 598 | if (pskb_expand_head(skb, skb_headroom(skb), diff, pri)) |
| 599 | return -ENOMEM; |
| 600 | skb_put(skb, diff); |
| 601 | memmove(skb->data + o_offset + n_len, |
| 602 | skb->data + o_offset + o_len, o_left); |
Arnaldo Carvalho de Melo | 27d7ff4 | 2007-03-31 11:55:19 -0300 | [diff] [blame] | 603 | skb_copy_to_linear_data_offset(skb, o_offset, n_buf, n_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | } |
| 605 | |
| 606 | /* must update the iph total length here */ |
Arnaldo Carvalho de Melo | eddc9ec | 2007-04-20 22:47:35 -0700 | [diff] [blame] | 607 | ip_hdr(skb)->tot_len = htons(skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
| 609 | LeaveFunction(9); |
| 610 | return 0; |
| 611 | } |
| 612 | |
| 613 | |
Sven Wegener | 048cf48 | 2008-08-10 18:24:35 +0000 | [diff] [blame] | 614 | int __init ip_vs_app_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | { |
| 616 | /* we will replace it with proc_net_ipvs_create() soon */ |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 617 | proc_net_fops_create(&init_net, "ip_vs_app", 0, &ip_vs_app_fops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | return 0; |
| 619 | } |
| 620 | |
| 621 | |
| 622 | void ip_vs_app_cleanup(void) |
| 623 | { |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 624 | proc_net_remove(&init_net, "ip_vs_app"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | } |