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session.c
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session.c
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/*
* Server management functions.
*
* Copyright 2000-2008 Willy Tarreau <w@1wt.eu>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <stdlib.h>
#include <common/config.h>
#include <common/debug.h>
#include <common/memory.h>
#include <types/capture.h>
#include <types/global.h>
#include <proto/acl.h>
#include <proto/backend.h>
#include <proto/buffers.h>
#include <proto/checks.h>
#include <proto/dumpstats.h>
#include <proto/hdr_idx.h>
#include <proto/log.h>
#include <proto/session.h>
#include <proto/pattern.h>
#include <proto/pipe.h>
#include <proto/proto_http.h>
#include <proto/proto_tcp.h>
#include <proto/proxy.h>
#include <proto/queue.h>
#include <proto/server.h>
#include <proto/stick_table.h>
#include <proto/stream_interface.h>
#include <proto/stream_sock.h>
#include <proto/task.h>
struct pool_head *pool2_session;
struct list sessions;
/*
* frees the context associated to a session. It must have been removed first.
*/
void session_free(struct session *s)
{
struct http_txn *txn = &s->txn;
struct proxy *fe = s->fe;
struct bref *bref, *back;
int i;
if (s->pend_pos)
pendconn_free(s->pend_pos);
if (s->srv) { /* there may be requests left pending in queue */
if (s->flags & SN_CURR_SESS) {
s->flags &= ~SN_CURR_SESS;
s->srv->cur_sess--;
}
if (may_dequeue_tasks(s->srv, s->be))
process_srv_queue(s->srv);
}
if (unlikely(s->srv_conn)) {
/* the session still has a reserved slot on a server, but
* it should normally be only the same as the one above,
* so this should not happen in fact.
*/
sess_change_server(s, NULL);
}
if (s->req->pipe)
put_pipe(s->req->pipe);
if (s->rep->pipe)
put_pipe(s->rep->pipe);
pool_free2(pool2_buffer, s->req);
pool_free2(pool2_buffer, s->rep);
http_end_txn(s);
for (i = 0; i < s->store_count; i++) {
if (!s->store[i].ts)
continue;
stksess_free(s->store[i].table, s->store[i].ts);
s->store[i].ts = NULL;
}
if (fe) {
pool_free2(fe->hdr_idx_pool, txn->hdr_idx.v);
pool_free2(fe->rsp_cap_pool, txn->rsp.cap);
pool_free2(fe->req_cap_pool, txn->req.cap);
}
list_for_each_entry_safe(bref, back, &s->back_refs, users) {
/* we have to unlink all watchers. We must not relink them if
* this session was the last one in the list.
*/
LIST_DEL(&bref->users);
LIST_INIT(&bref->users);
if (s->list.n != &sessions)
LIST_ADDQ(&LIST_ELEM(s->list.n, struct session *, list)->back_refs, &bref->users);
bref->ref = s->list.n;
}
LIST_DEL(&s->list);
pool_free2(pool2_session, s);
/* We may want to free the maximum amount of pools if the proxy is stopping */
if (fe && unlikely(fe->state == PR_STSTOPPED)) {
pool_flush2(pool2_buffer);
pool_flush2(fe->hdr_idx_pool);
pool_flush2(pool2_requri);
pool_flush2(pool2_capture);
pool_flush2(pool2_session);
pool_flush2(fe->req_cap_pool);
pool_flush2(fe->rsp_cap_pool);
}
}
/* perform minimal intializations, report 0 in case of error, 1 if OK. */
int init_session()
{
LIST_INIT(&sessions);
pool2_session = create_pool("session", sizeof(struct session), MEM_F_SHARED);
return pool2_session != NULL;
}
void session_process_counters(struct session *s)
{
unsigned long long bytes;
if (s->req) {
bytes = s->req->total - s->logs.bytes_in;
s->logs.bytes_in = s->req->total;
if (bytes) {
s->fe->counters.bytes_in += bytes;
if (s->be != s->fe)
s->be->counters.bytes_in += bytes;
if (s->srv)
s->srv->counters.bytes_in += bytes;
if (s->listener->counters)
s->listener->counters->bytes_in += bytes;
}
}
if (s->rep) {
bytes = s->rep->total - s->logs.bytes_out;
s->logs.bytes_out = s->rep->total;
if (bytes) {
s->fe->counters.bytes_out += bytes;
if (s->be != s->fe)
s->be->counters.bytes_out += bytes;
if (s->srv)
s->srv->counters.bytes_out += bytes;
if (s->listener->counters)
s->listener->counters->bytes_out += bytes;
}
}
}
/* This function is called with (si->state == SI_ST_CON) meaning that a
* connection was attempted and that the file descriptor is already allocated.
* We must check for establishment, error and abort. Possible output states
* are SI_ST_EST (established), SI_ST_CER (error), SI_ST_DIS (abort), and
* SI_ST_CON (no change). The function returns 0 if it switches to SI_ST_CER,
* otherwise 1.
*/
int sess_update_st_con_tcp(struct session *s, struct stream_interface *si)
{
struct buffer *req = si->ob;
struct buffer *rep = si->ib;
/* If we got an error, or if nothing happened and the connection timed
* out, we must give up. The CER state handler will take care of retry
* attempts and error reports.
*/
if (unlikely(si->flags & (SI_FL_EXP|SI_FL_ERR))) {
si->exp = TICK_ETERNITY;
si->state = SI_ST_CER;
si->flags &= ~SI_FL_CAP_SPLICE;
fd_delete(si->fd);
if (si->err_type)
return 0;
si->err_loc = s->srv;
if (si->flags & SI_FL_ERR)
si->err_type = SI_ET_CONN_ERR;
else
si->err_type = SI_ET_CONN_TO;
return 0;
}
/* OK, maybe we want to abort */
if (unlikely((rep->flags & BF_SHUTW) ||
((req->flags & BF_SHUTW_NOW) && /* FIXME: this should not prevent a connection from establishing */
(((req->flags & (BF_OUT_EMPTY|BF_WRITE_ACTIVITY)) == BF_OUT_EMPTY) ||
s->be->options & PR_O_ABRT_CLOSE)))) {
/* give up */
si->shutw(si);
si->err_type |= SI_ET_CONN_ABRT;
si->err_loc = s->srv;
si->flags &= ~SI_FL_CAP_SPLICE;
if (s->srv_error)
s->srv_error(s, si);
return 1;
}
/* we need to wait a bit more if there was no activity either */
if (!(req->flags & BF_WRITE_ACTIVITY))
return 1;
/* OK, this means that a connection succeeded. The caller will be
* responsible for handling the transition from CON to EST.
*/
s->logs.t_connect = tv_ms_elapsed(&s->logs.tv_accept, &now);
si->exp = TICK_ETERNITY;
si->state = SI_ST_EST;
si->err_type = SI_ET_NONE;
si->err_loc = NULL;
return 1;
}
/* This function is called with (si->state == SI_ST_CER) meaning that a
* previous connection attempt has failed and that the file descriptor
* has already been released. Possible causes include asynchronous error
* notification and time out. Possible output states are SI_ST_CLO when
* retries are exhausted, SI_ST_TAR when a delay is wanted before a new
* connection attempt, SI_ST_ASS when it's wise to retry on the same server,
* and SI_ST_REQ when an immediate redispatch is wanted. The buffers are
* marked as in error state. It returns 0.
*/
int sess_update_st_cer(struct session *s, struct stream_interface *si)
{
/* we probably have to release last session from the server */
if (s->srv) {
health_adjust(s->srv, HANA_STATUS_L4_ERR);
if (s->flags & SN_CURR_SESS) {
s->flags &= ~SN_CURR_SESS;
s->srv->cur_sess--;
}
}
/* ensure that we have enough retries left */
s->conn_retries--;
if (s->conn_retries < 0) {
if (!si->err_type) {
si->err_type = SI_ET_CONN_ERR;
si->err_loc = s->srv;
}
if (s->srv)
s->srv->counters.failed_conns++;
s->be->counters.failed_conns++;
sess_change_server(s, NULL);
if (may_dequeue_tasks(s->srv, s->be))
process_srv_queue(s->srv);
/* shutw is enough so stop a connecting socket */
si->shutw(si);
si->ob->flags |= BF_WRITE_ERROR;
si->ib->flags |= BF_READ_ERROR;
si->state = SI_ST_CLO;
if (s->srv_error)
s->srv_error(s, si);
return 0;
}
/* If the "redispatch" option is set on the backend, we are allowed to
* retry on another server for the last retry. In order to achieve this,
* we must mark the session unassigned, and eventually clear the DIRECT
* bit to ignore any persistence cookie. We won't count a retry nor a
* redispatch yet, because this will depend on what server is selected.
*/
if (s->srv && s->conn_retries == 0 &&
s->be->options & PR_O_REDISP && !(s->flags & SN_FORCE_PRST)) {
sess_change_server(s, NULL);
if (may_dequeue_tasks(s->srv, s->be))
process_srv_queue(s->srv);
s->flags &= ~(SN_DIRECT | SN_ASSIGNED | SN_ADDR_SET);
s->prev_srv = s->srv;
si->state = SI_ST_REQ;
} else {
if (s->srv)
s->srv->counters.retries++;
s->be->counters.retries++;
si->state = SI_ST_ASS;
}
if (si->flags & SI_FL_ERR) {
/* The error was an asynchronous connection error, and we will
* likely have to retry connecting to the same server, most
* likely leading to the same result. To avoid this, we wait
* one second before retrying.
*/
if (!si->err_type)
si->err_type = SI_ET_CONN_ERR;
si->state = SI_ST_TAR;
si->exp = tick_add(now_ms, MS_TO_TICKS(1000));
return 0;
}
return 0;
}
/*
* This function handles the transition between the SI_ST_CON state and the
* SI_ST_EST state. It must only be called after switching from SI_ST_CON to
* SI_ST_EST.
*/
void sess_establish(struct session *s, struct stream_interface *si)
{
struct buffer *req = si->ob;
struct buffer *rep = si->ib;
if (s->srv)
health_adjust(s->srv, HANA_STATUS_L4_OK);
if (s->be->mode == PR_MODE_TCP) { /* let's allow immediate data connection in this case */
/* if the user wants to log as soon as possible, without counting
* bytes from the server, then this is the right moment. */
if (s->fe->to_log && !(s->logs.logwait & LW_BYTES)) {
s->logs.t_close = s->logs.t_connect; /* to get a valid end date */
s->do_log(s);
}
}
else {
s->txn.rsp.msg_state = HTTP_MSG_RPBEFORE;
/* reset hdr_idx which was already initialized by the request.
* right now, the http parser does it.
* hdr_idx_init(&s->txn.hdr_idx);
*/
}
rep->analysers |= s->fe->fe_rsp_ana | s->be->be_rsp_ana;
rep->flags |= BF_READ_ATTACHED; /* producer is now attached */
req->wex = TICK_ETERNITY;
if (unlikely(stats_event_enabled))
stats_event_new_session(s);
}
/* Update stream interface status for input states SI_ST_ASS, SI_ST_QUE, SI_ST_TAR.
* Other input states are simply ignored.
* Possible output states are SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ, SI_ST_CON.
* Flags must have previously been updated for timeouts and other conditions.
*/
void sess_update_stream_int(struct session *s, struct stream_interface *si)
{
DPRINTF(stderr,"[%u] %s: sess=%p rq=%p, rp=%p, exp(r,w)=%u,%u rqf=%08x rpf=%08x rql=%d rpl=%d cs=%d ss=%d\n",
now_ms, __FUNCTION__,
s,
s->req, s->rep,
s->req->rex, s->rep->wex,
s->req->flags, s->rep->flags,
s->req->l, s->rep->l, s->rep->cons->state, s->req->cons->state);
if (si->state == SI_ST_ASS) {
/* Server assigned to connection request, we have to try to connect now */
int conn_err;
conn_err = connect_server(s);
if (conn_err == SN_ERR_NONE) {
/* state = SI_ST_CON now */
if (s->srv)
srv_inc_sess_ctr(s->srv);
return;
}
/* We have received a synchronous error. We might have to
* abort, retry immediately or redispatch.
*/
if (conn_err == SN_ERR_INTERNAL) {
if (!si->err_type) {
si->err_type = SI_ET_CONN_OTHER;
si->err_loc = s->srv;
}
if (s->srv)
srv_inc_sess_ctr(s->srv);
if (s->srv)
s->srv->counters.failed_conns++;
s->be->counters.failed_conns++;
/* release other sessions waiting for this server */
sess_change_server(s, NULL);
if (may_dequeue_tasks(s->srv, s->be))
process_srv_queue(s->srv);
/* Failed and not retryable. */
si->shutr(si);
si->shutw(si);
si->ob->flags |= BF_WRITE_ERROR;
s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
/* no session was ever accounted for this server */
si->state = SI_ST_CLO;
if (s->srv_error)
s->srv_error(s, si);
return;
}
/* We are facing a retryable error, but we don't want to run a
* turn-around now, as the problem is likely a source port
* allocation problem, so we want to retry now.
*/
si->state = SI_ST_CER;
si->flags &= ~SI_FL_ERR;
sess_update_st_cer(s, si);
/* now si->state is one of SI_ST_CLO, SI_ST_TAR, SI_ST_ASS, SI_ST_REQ */
return;
}
else if (si->state == SI_ST_QUE) {
/* connection request was queued, check for any update */
if (!s->pend_pos) {
/* The connection is not in the queue anymore. Either
* we have a server connection slot available and we
* go directly to the assigned state, or we need to
* load-balance first and go to the INI state.
*/
si->exp = TICK_ETERNITY;
if (unlikely(!(s->flags & SN_ASSIGNED)))
si->state = SI_ST_REQ;
else {
s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
si->state = SI_ST_ASS;
}
return;
}
/* Connection request still in queue... */
if (si->flags & SI_FL_EXP) {
/* ... and timeout expired */
si->exp = TICK_ETERNITY;
s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
if (s->srv)
s->srv->counters.failed_conns++;
s->be->counters.failed_conns++;
si->shutr(si);
si->shutw(si);
si->ob->flags |= BF_WRITE_TIMEOUT;
if (!si->err_type)
si->err_type = SI_ET_QUEUE_TO;
si->state = SI_ST_CLO;
if (s->srv_error)
s->srv_error(s, si);
return;
}
/* Connection remains in queue, check if we have to abort it */
if ((si->ob->flags & (BF_READ_ERROR)) ||
((si->ob->flags & BF_SHUTW_NOW) && /* empty and client aborted */
(si->ob->flags & BF_OUT_EMPTY || s->be->options & PR_O_ABRT_CLOSE))) {
/* give up */
si->exp = TICK_ETERNITY;
s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
si->shutr(si);
si->shutw(si);
si->err_type |= SI_ET_QUEUE_ABRT;
si->state = SI_ST_CLO;
if (s->srv_error)
s->srv_error(s, si);
return;
}
/* Nothing changed */
return;
}
else if (si->state == SI_ST_TAR) {
/* Connection request might be aborted */
if ((si->ob->flags & (BF_READ_ERROR)) ||
((si->ob->flags & BF_SHUTW_NOW) && /* empty and client aborted */
(si->ob->flags & BF_OUT_EMPTY || s->be->options & PR_O_ABRT_CLOSE))) {
/* give up */
si->exp = TICK_ETERNITY;
si->shutr(si);
si->shutw(si);
si->err_type |= SI_ET_CONN_ABRT;
si->state = SI_ST_CLO;
if (s->srv_error)
s->srv_error(s, si);
return;
}
if (!(si->flags & SI_FL_EXP))
return; /* still in turn-around */
si->exp = TICK_ETERNITY;
/* we keep trying on the same server as long as the session is
* marked "assigned".
* FIXME: Should we force a redispatch attempt when the server is down ?
*/
if (s->flags & SN_ASSIGNED)
si->state = SI_ST_ASS;
else
si->state = SI_ST_REQ;
return;
}
}
/* This function initiates a server connection request on a stream interface
* already in SI_ST_REQ state. Upon success, the state goes to SI_ST_ASS,
* indicating that a server has been assigned. It may also return SI_ST_QUE,
* or SI_ST_CLO upon error.
*/
static void sess_prepare_conn_req(struct session *s, struct stream_interface *si) {
DPRINTF(stderr,"[%u] %s: sess=%p rq=%p, rp=%p, exp(r,w)=%u,%u rqf=%08x rpf=%08x rql=%d rpl=%d cs=%d ss=%d\n",
now_ms, __FUNCTION__,
s,
s->req, s->rep,
s->req->rex, s->rep->wex,
s->req->flags, s->rep->flags,
s->req->l, s->rep->l, s->rep->cons->state, s->req->cons->state);
if (si->state != SI_ST_REQ)
return;
/* Try to assign a server */
if (srv_redispatch_connect(s) != 0) {
/* We did not get a server. Either we queued the
* connection request, or we encountered an error.
*/
if (si->state == SI_ST_QUE)
return;
/* we did not get any server, let's check the cause */
si->shutr(si);
si->shutw(si);
si->ob->flags |= BF_WRITE_ERROR;
if (!si->err_type)
si->err_type = SI_ET_CONN_OTHER;
si->state = SI_ST_CLO;
if (s->srv_error)
s->srv_error(s, si);
return;
}
/* The server is assigned */
s->logs.t_queue = tv_ms_elapsed(&s->logs.tv_accept, &now);
si->state = SI_ST_ASS;
}
/* This stream analyser checks the switching rules and changes the backend
* if appropriate. The default_backend rule is also considered, then the
* target backend's forced persistence rules are also evaluated last if any.
* It returns 1 if the processing can continue on next analysers, or zero if it
* either needs more data or wants to immediately abort the request.
*/
int process_switching_rules(struct session *s, struct buffer *req, int an_bit)
{
struct persist_rule *prst_rule;
req->analysers &= ~an_bit;
req->analyse_exp = TICK_ETERNITY;
DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bl=%d analysers=%02x\n",
now_ms, __FUNCTION__,
s,
req,
req->rex, req->wex,
req->flags,
req->l,
req->analysers);
/* now check whether we have some switching rules for this request */
if (!(s->flags & SN_BE_ASSIGNED)) {
struct switching_rule *rule;
list_for_each_entry(rule, &s->fe->switching_rules, list) {
int ret;
ret = acl_exec_cond(rule->cond, s->fe, s, &s->txn, ACL_DIR_REQ);
ret = acl_pass(ret);
if (rule->cond->pol == ACL_COND_UNLESS)
ret = !ret;
if (ret) {
if (!session_set_backend(s, rule->be.backend))
goto sw_failed;
break;
}
}
/* To ensure correct connection accounting on the backend, we
* have to assign one if it was not set (eg: a listen). This
* measure also takes care of correctly setting the default
* backend if any.
*/
if (!(s->flags & SN_BE_ASSIGNED))
if (!session_set_backend(s, s->fe->defbe.be ? s->fe->defbe.be : s->be))
goto sw_failed;
}
/* we don't want to run the HTTP filters again if the backend has not changed */
if (s->fe == s->be)
s->req->analysers &= ~AN_REQ_HTTP_PROCESS_BE;
/* as soon as we know the backend, we must check if we have a matching forced or ignored
* persistence rule, and report that in the session.
*/
list_for_each_entry(prst_rule, &s->be->persist_rules, list) {
int ret = 1;
if (prst_rule->cond) {
ret = acl_exec_cond(prst_rule->cond, s->be, s, &s->txn, ACL_DIR_REQ);
ret = acl_pass(ret);
if (prst_rule->cond->pol == ACL_COND_UNLESS)
ret = !ret;
}
if (ret) {
/* no rule, or the rule matches */
if (prst_rule->type == PERSIST_TYPE_FORCE) {
s->flags |= SN_FORCE_PRST;
} else {
s->flags |= SN_IGNORE_PRST;
}
break;
}
}
return 1;
sw_failed:
/* immediately abort this request in case of allocation failure */
buffer_abort(s->req);
buffer_abort(s->rep);
if (!(s->flags & SN_ERR_MASK))
s->flags |= SN_ERR_RESOURCE;
if (!(s->flags & SN_FINST_MASK))
s->flags |= SN_FINST_R;
s->txn.status = 500;
s->req->analysers = 0;
s->req->analyse_exp = TICK_ETERNITY;
return 0;
}
/* This stream analyser works on a request. It applies all sticking rules on
* it then returns 1. The data must already be present in the buffer otherwise
* they won't match. It always returns 1.
*/
int process_sticking_rules(struct session *s, struct buffer *req, int an_bit)
{
struct proxy *px = s->be;
struct sticking_rule *rule;
DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bl=%d analysers=%02x\n",
now_ms, __FUNCTION__,
s,
req,
req->rex, req->wex,
req->flags,
req->l,
req->analysers);
list_for_each_entry(rule, &px->sticking_rules, list) {
int ret = 1 ;
int i;
for (i = 0; i < s->store_count; i++) {
if (rule->table.t == s->store[i].table)
break;
}
if (i != s->store_count)
continue;
if (rule->cond) {
ret = acl_exec_cond(rule->cond, px, s, &s->txn, ACL_DIR_REQ);
ret = acl_pass(ret);
if (rule->cond->pol == ACL_COND_UNLESS)
ret = !ret;
}
if (ret) {
struct stktable_key *key;
key = pattern_process_key(px, s, &s->txn, PATTERN_FETCH_REQ, rule->expr, rule->table.t->type);
if (!key)
continue;
if (rule->flags & STK_IS_MATCH) {
struct stksess *ts;
if ((ts = stktable_lookup(rule->table.t, key)) != NULL) {
if (!(s->flags & SN_ASSIGNED)) {
struct eb32_node *node;
/* srv found in table */
node = eb32_lookup(&px->conf.used_server_id, ts->sid);
if (node) {
struct server *srv;
srv = container_of(node, struct server, conf.id);
if ((srv->state & SRV_RUNNING) ||
(px->options & PR_O_PERSIST) ||
(s->flags & SN_FORCE_PRST)) {
s->flags |= SN_DIRECT | SN_ASSIGNED;
s->srv = srv;
}
}
}
ts->expire = tick_add(now_ms, MS_TO_TICKS(rule->table.t->expire));
}
}
if (rule->flags & STK_IS_STORE) {
if (s->store_count < (sizeof(s->store) / sizeof(s->store[0]))) {
struct stksess *ts;
ts = stksess_new(rule->table.t, key);
if (ts) {
s->store[s->store_count].table = rule->table.t;
s->store[s->store_count++].ts = ts;
}
}
}
}
}
req->analysers &= ~an_bit;
req->analyse_exp = TICK_ETERNITY;
return 1;
}
/* This stream analyser works on a response. It applies all store rules on it
* then returns 1. The data must already be present in the buffer otherwise
* they won't match. It always returns 1.
*/
int process_store_rules(struct session *s, struct buffer *rep, int an_bit)
{
struct proxy *px = s->be;
struct sticking_rule *rule;
int i;
DPRINTF(stderr,"[%u] %s: session=%p b=%p, exp(r,w)=%u,%u bf=%08x bl=%d analysers=%02x\n",
now_ms, __FUNCTION__,
s,
rep,
rep->rex, rep->wex,
rep->flags,
rep->l,
rep->analysers);
list_for_each_entry(rule, &px->storersp_rules, list) {
int ret = 1 ;
int storereqidx = -1;
for (i = 0; i < s->store_count; i++) {
if (rule->table.t == s->store[i].table) {
if (!(s->store[i].flags))
storereqidx = i;
break;
}
}
if ((i != s->store_count) && (storereqidx == -1))
continue;
if (rule->cond) {
ret = acl_exec_cond(rule->cond, px, s, &s->txn, ACL_DIR_RTR);
ret = acl_pass(ret);
if (rule->cond->pol == ACL_COND_UNLESS)
ret = !ret;
}
if (ret) {
struct stktable_key *key;
key = pattern_process_key(px, s, &s->txn, PATTERN_FETCH_RTR, rule->expr, rule->table.t->type);
if (!key)
continue;
if (storereqidx != -1) {
stksess_key(s->store[storereqidx].table, s->store[storereqidx].ts, key);
s->store[storereqidx].flags = 1;
}
else if (s->store_count < (sizeof(s->store) / sizeof(s->store[0]))) {
struct stksess *ts;
ts = stksess_new(rule->table.t, key);
if (ts) {
s->store[s->store_count].table = rule->table.t;
s->store[s->store_count].flags = 1;
s->store[s->store_count++].ts = ts;
}
}
}
}
/* process store request and store response */
for (i = 0; i < s->store_count; i++) {
if (stktable_store(s->store[i].table, s->store[i].ts, s->srv->puid) > 0)
stksess_free(s->store[i].table, s->store[i].ts);
/* always remove pointer to session to ensure we won't free it again */
s->store[i].ts = NULL;
}
s->store_count = 0; /* everything is stored */
rep->analysers &= ~an_bit;
rep->analyse_exp = TICK_ETERNITY;
return 1;
}
/* This macro is very specific to the function below. See the comments in
* process_session() below to understand the logic and the tests.
*/
#define UPDATE_ANALYSERS(real, list, back, flag) { \
list = (((list) & ~(flag)) | ~(back)) & (real); \
back = real; \
if (!(list)) \
break; \
if (((list) ^ ((list) & ((list) - 1))) < (flag)) \
continue; \
}
/* Processes the client, server, request and response jobs of a session task,
* then puts it back to the wait queue in a clean state, or cleans up its
* resources if it must be deleted. Returns in <next> the date the task wants
* to be woken up, or TICK_ETERNITY. In order not to call all functions for
* nothing too many times, the request and response buffers flags are monitored
* and each function is called only if at least another function has changed at
* least one flag it is interested in.
*/
struct task *process_session(struct task *t)
{
struct session *s = t->context;
unsigned int rqf_last, rpf_last;
unsigned int req_ana_back;
//DPRINTF(stderr, "%s:%d: cs=%d ss=%d(%d) rqf=0x%08x rpf=0x%08x\n", __FUNCTION__, __LINE__,
// s->si[0].state, s->si[1].state, s->si[1].err_type, s->req->flags, s->rep->flags);
/* this data may be no longer valid, clear it */
memset(&s->txn.auth, 0, sizeof(s->txn.auth));
/* This flag must explicitly be set every time */
s->req->flags &= ~BF_READ_NOEXP;
/* Keep a copy of req/rep flags so that we can detect shutdowns */
rqf_last = s->req->flags;
rpf_last = s->rep->flags;
/* we don't want the stream interface functions to recursively wake us up */
if (s->req->prod->owner == t)
s->req->prod->flags |= SI_FL_DONT_WAKE;
if (s->req->cons->owner == t)
s->req->cons->flags |= SI_FL_DONT_WAKE;
/* 1a: Check for low level timeouts if needed. We just set a flag on
* stream interfaces when their timeouts have expired.
*/
if (unlikely(t->state & TASK_WOKEN_TIMER)) {
stream_int_check_timeouts(&s->si[0]);
stream_int_check_timeouts(&s->si[1]);
/* check buffer timeouts, and close the corresponding stream interfaces
* for future reads or writes. Note: this will also concern upper layers
* but we do not touch any other flag. We must be careful and correctly
* detect state changes when calling them.
*/
buffer_check_timeouts(s->req);
if (unlikely((s->req->flags & (BF_SHUTW|BF_WRITE_TIMEOUT)) == BF_WRITE_TIMEOUT)) {
s->req->cons->flags |= SI_FL_NOLINGER;
s->req->cons->shutw(s->req->cons);
}
if (unlikely((s->req->flags & (BF_SHUTR|BF_READ_TIMEOUT)) == BF_READ_TIMEOUT))
s->req->prod->shutr(s->req->prod);
buffer_check_timeouts(s->rep);
if (unlikely((s->rep->flags & (BF_SHUTW|BF_WRITE_TIMEOUT)) == BF_WRITE_TIMEOUT)) {
s->rep->cons->flags |= SI_FL_NOLINGER;
s->rep->cons->shutw(s->rep->cons);
}
if (unlikely((s->rep->flags & (BF_SHUTR|BF_READ_TIMEOUT)) == BF_READ_TIMEOUT))
s->rep->prod->shutr(s->rep->prod);
}
/* 1b: check for low-level errors reported at the stream interface.
* First we check if it's a retryable error (in which case we don't
* want to tell the buffer). Otherwise we report the error one level
* upper by setting flags into the buffers. Note that the side towards
* the client cannot have connect (hence retryable) errors. Also, the
* connection setup code must be able to deal with any type of abort.
*/
if (unlikely(s->si[0].flags & SI_FL_ERR)) {
if (s->si[0].state == SI_ST_EST || s->si[0].state == SI_ST_DIS) {
s->si[0].shutr(&s->si[0]);
s->si[0].shutw(&s->si[0]);
stream_int_report_error(&s->si[0]);
if (!(s->req->analysers) && !(s->rep->analysers)) {
s->be->counters.cli_aborts++;
if (s->srv)
s->srv->counters.cli_aborts++;
if (!(s->flags & SN_ERR_MASK))
s->flags |= SN_ERR_CLICL;
if (!(s->flags & SN_FINST_MASK))
s->flags |= SN_FINST_D;
}
}
}
if (unlikely(s->si[1].flags & SI_FL_ERR)) {
if (s->si[1].state == SI_ST_EST || s->si[1].state == SI_ST_DIS) {
s->si[1].shutr(&s->si[1]);
s->si[1].shutw(&s->si[1]);
stream_int_report_error(&s->si[1]);
s->be->counters.failed_resp++;
if (s->srv)
s->srv->counters.failed_resp++;
if (!(s->req->analysers) && !(s->rep->analysers)) {
s->be->counters.srv_aborts++;
if (s->srv)
s->srv->counters.srv_aborts++;
if (!(s->flags & SN_ERR_MASK))
s->flags |= SN_ERR_SRVCL;
if (!(s->flags & SN_FINST_MASK))
s->flags |= SN_FINST_D;
}
}
/* note: maybe we should process connection errors here ? */
}
if (s->si[1].state == SI_ST_CON) {
/* we were trying to establish a connection on the server side,
* maybe it succeeded, maybe it failed, maybe we timed out, ...
*/
if (unlikely(!sess_update_st_con_tcp(s, &s->si[1])))
sess_update_st_cer(s, &s->si[1]);
else if (s->si[1].state == SI_ST_EST)
sess_establish(s, &s->si[1]);
/* state is now one of SI_ST_CON (still in progress), SI_ST_EST
* (established), SI_ST_DIS (abort), SI_ST_CLO (last error),
* SI_ST_ASS/SI_ST_TAR/SI_ST_REQ for retryable errors.
*/
}
resync_stream_interface:
/* Check for connection closure */
DPRINTF(stderr,
"[%u] %s:%d: task=%p s=%p, sfl=0x%08x, rq=%p, rp=%p, exp(r,w)=%u,%u rqf=%08x rpf=%08x rql=%d rpl=%d cs=%d ss=%d, cet=0x%x set=0x%x retr=%d\n",
now_ms, __FUNCTION__, __LINE__,
t,
s, s->flags,
s->req, s->rep,
s->req->rex, s->rep->wex,
s->req->flags, s->rep->flags,
s->req->l, s->rep->l, s->rep->cons->state, s->req->cons->state,
s->rep->cons->err_type, s->req->cons->err_type,
s->conn_retries);
/* nothing special to be done on client side */
if (unlikely(s->req->prod->state == SI_ST_DIS))
s->req->prod->state = SI_ST_CLO;
/* When a server-side connection is released, we have to count it and
* check for pending connections on this server.
*/
if (unlikely(s->req->cons->state == SI_ST_DIS)) {
s->req->cons->state = SI_ST_CLO;
if (s->srv) {
if (s->flags & SN_CURR_SESS) {
s->flags &= ~SN_CURR_SESS;
s->srv->cur_sess--;
}
sess_change_server(s, NULL);
if (may_dequeue_tasks(s->srv, s->be))
process_srv_queue(s->srv);
}
}
/*
* Note: of the transient states (REQ, CER, DIS), only REQ may remain
* at this point.
*/