[PATCH 1 of 6] QUIC: ignore server address while looking up a connection

[Roman Arutyunyan]

# HG changeset patch
# User Roman Arutyunyan <arut at nginx.com>
# Date 1670322119 0
#      Tue Dec 06 10:21:59 2022 +0000
# Branch quic
# Node ID 1038d7300c29eea02b47eac3f205e293b1e55f5b
# Parent  b87a0dbc1150f415def5bc1e1f00d02b33519026
QUIC: ignore server address while looking up a connection.

The server connection check was copied from the common UDP code in c2f5d79cde64.
In QUIC it does not make much sense though.  Technically client is not allowed
to migrate to a different server address.  However, migrating withing a single
wildcard listening does not seem to affect anything.

diff --git a/src/event/quic/ngx_event_quic_udp.c b/src/event/quic/ngx_event_quic_udp.c
--- a/src/event/quic/ngx_event_quic_udp.c
+++ b/src/event/quic/ngx_event_quic_udp.c
@@ -13,7 +13,7 @@
 
 static void ngx_quic_close_accepted_connection(ngx_connection_t *c);
 static ngx_connection_t *ngx_quic_lookup_connection(ngx_listening_t *ls,
-    ngx_str_t *key, struct sockaddr *local_sockaddr, socklen_t local_socklen);
+    ngx_str_t *key);
 
 
 void
@@ -156,7 +156,7 @@ ngx_quic_recvmsg(ngx_event_t *ev)
             goto next;
         }
 
-        c = ngx_quic_lookup_connection(ls, &key, local_sockaddr, local_socklen);
+        c = ngx_quic_lookup_connection(ls, &key);
 
         if (c) {
 
@@ -370,7 +370,6 @@ ngx_quic_rbtree_insert_value(ngx_rbtree_
     ngx_rbtree_node_t *node, ngx_rbtree_node_t *sentinel)
 {
     ngx_int_t            rc;
-    ngx_connection_t    *c, *ct;
     ngx_rbtree_node_t  **p;
     ngx_quic_socket_t   *qsock, *qsockt;
 
@@ -387,19 +386,11 @@ ngx_quic_rbtree_insert_value(ngx_rbtree_
         } else { /* node->key == temp->key */
 
             qsock = (ngx_quic_socket_t *) node;
-            c = qsock->udp.connection;
-
             qsockt = (ngx_quic_socket_t *) temp;
-            ct = qsockt->udp.connection;
 
             rc = ngx_memn2cmp(qsock->sid.id, qsockt->sid.id,
                               qsock->sid.len, qsockt->sid.len);
 
-            if (rc == 0 && c->listening->wildcard) {
-                rc = ngx_cmp_sockaddr(c->local_sockaddr, c->local_socklen,
-                                      ct->local_sockaddr, ct->local_socklen, 1);
-            }
-
             p = (rc < 0) ? &temp->left : &temp->right;
         }
 
@@ -419,8 +410,7 @@ ngx_quic_rbtree_insert_value(ngx_rbtree_
 
 
 static ngx_connection_t *
-ngx_quic_lookup_connection(ngx_listening_t *ls, ngx_str_t *key,
-    struct sockaddr *local_sockaddr, socklen_t local_socklen)
+ngx_quic_lookup_connection(ngx_listening_t *ls, ngx_str_t *key)
 {
     uint32_t            hash;
     ngx_int_t           rc;
@@ -454,14 +444,8 @@ ngx_quic_lookup_connection(ngx_listening
 
         rc = ngx_memn2cmp(key->data, qsock->sid.id, key->len, qsock->sid.len);
 
-        c = qsock->udp.connection;
-
-        if (rc == 0 && ls->wildcard) {
-            rc = ngx_cmp_sockaddr(local_sockaddr, local_socklen,
-                                  c->local_sockaddr, c->local_socklen, 1);
-        }
-
         if (rc == 0) {
+            c = qsock->udp.connection;
             c->udp = &qsock->udp;
             return c;
         }