MINOR: vars: add "set-var" for "tcp-request connection" rules.

Session struct is already allocated when "tcp-request connection" rules
are evaluated so session-scoped variables turned out easy to support.

This resolves github issue #1408.

doc/configuration.txt

@@ -11982,10 +11982,13 @@ tcp-request connection <action> <options...> [ { if | unless } <condition> ]
     - set-src <expr>
     - set-src-port <expr>
     - set-tos <tos>
+    - set-var(<var-name>) <expr>
+    - set-var-fmt(<var-name>) <fmt>
     - silent-drop
     - track-sc0 <key> [table <table>]
     - track-sc1 <key> [table <table>]
     - track-sc2 <key> [table <table>]
+    - unset-var(<var-name>)
 
   The supported actions are described below.
 
@@ -12110,6 +12113,14 @@ tcp-request connection set-tos <tos> [ { if | unless } <condition> ]
   to the value passed in <tos> on platforms which support this. Please refer to
   "http-request set-tos" for a complete description.
 
+tcp-request connection set-var(<var-name>) <expr> [ { if | unless } <condition> ]
+tcp-request connection set-var-fmt(<var-name>) <fmt> [ { if | unless } <condition> ]
+
+  This is used to set the contents of a variable. The variable is declared
+  inline. "tcp-request connection" can set variables in the "proc" and "sess"
+  scopes. Please refer to "http-request set-var" and "http-request set-var-fmt"
+  for a complete description.
+
 tcp-request connection silent-drop [ { if | unless } <condition> ]
 
   This stops the evaluation of the rules and makes the client-facing connection
@@ -12125,6 +12136,11 @@ tcp-request connection track-sc2  <key> [table <table>] [ { if | unless } <condi
   refer to "http-request track-sc0", "http-request track-sc1" and "http-request
   track-sc2" for a complete description.
 
+tcp-request connection unset-var(<var-name>) [ { if | unless } <condition> ]
+
+  This is used to unset a variable. Please refer to "http-request set-var" for
+  details about variables.
+
 
 tcp-request content <action> [{if | unless} <condition>]
   Perform an action on a new session depending on a layer 4-7 condition

src/vars.c

@@ -659,6 +659,7 @@ static enum act_return action_store(struct act_rule *rule, struct proxy *px,
 	int dir;
 
 	switch (rule->from) {
+	case ACT_F_TCP_REQ_CON: dir = SMP_OPT_DIR_REQ; break;
 	case ACT_F_TCP_REQ_SES: dir = SMP_OPT_DIR_REQ; break;
 	case ACT_F_TCP_REQ_CNT: dir = SMP_OPT_DIR_REQ; break;
 	case ACT_F_TCP_RES_CNT: dir = SMP_OPT_DIR_RES; break;
@@ -827,6 +828,10 @@ static enum act_parse_ret parse_store(const char **args, int *arg, struct proxy
 	kw_name = args[*arg-1];
 
 	switch (rule->from) {
+	case ACT_F_TCP_REQ_CON:
+		flags = SMP_VAL_FE_CON_ACC;
+		px->conf.args.ctx = ARGC_TCO;
+		break;
 	case ACT_F_TCP_REQ_SES:
 		flags = SMP_VAL_FE_SES_ACC;
 		px->conf.args.ctx = ARGC_TSE;
@@ -1213,6 +1218,15 @@ static struct sample_conv_kw_list sample_conv_kws = {ILH, {
 
 INITCALL1(STG_REGISTER, sample_register_convs, &sample_conv_kws);
 
+static struct action_kw_list tcp_req_conn_kws = { { }, {
+	{ "set-var-fmt", parse_store, KWF_MATCH_PREFIX },
+	{ "set-var",   parse_store, KWF_MATCH_PREFIX },
+	{ "unset-var", parse_store, KWF_MATCH_PREFIX },
+	{ /* END */ }
+}};
+
+INITCALL1(STG_REGISTER, tcp_req_conn_keywords_register, &tcp_req_conn_kws);
+
 static struct action_kw_list tcp_req_sess_kws = { { }, {
 	{ "set-var-fmt", parse_store, KWF_MATCH_PREFIX },
 	{ "set-var",   parse_store, KWF_MATCH_PREFIX },