QUIC CHANNEL: Introduce concept of (non-)addressed mode

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21715)

3 files changed, 19 insertions, 3 deletions

diff --git a/ssl/quic/quic_channel.c b/ssl/quic/quic_channel.c
index 275d5f576b..efbe1c1660 100644
--- a/ssl/quic/quic_channel.c
+++ b/ssl/quic/quic_channel.c
@@ -584,13 +584,26 @@ int ossl_quic_channel_set_mutator(QUIC_CHANNEL *ch,
 
 int ossl_quic_channel_get_peer_addr(QUIC_CHANNEL *ch, BIO_ADDR *peer_addr)
 {
+    if (!ch->addressed_mode)
+        return 0;
+
     *peer_addr = ch->cur_peer_addr;
     return 1;
 }
 
 int ossl_quic_channel_set_peer_addr(QUIC_CHANNEL *ch, const BIO_ADDR *peer_addr)
 {
-    ch->cur_peer_addr = *peer_addr;
+    if (ch->state != QUIC_CHANNEL_STATE_IDLE)
+        return 0;
+
+    if (peer_addr == NULL || BIO_ADDR_family(peer_addr) == AF_UNSPEC) {
+        BIO_ADDR_clear(&ch->cur_peer_addr);
+        ch->addressed_mode = 0;
+        return 1;
+    }
+
+    ch->cur_peer_addr   = *peer_addr;
+    ch->addressed_mode  = 1;
     return 1;
 }
 
diff --git a/ssl/quic/quic_channel_local.h b/ssl/quic/quic_channel_local.h
index a60a539f9b..8b2edc647a 100644
--- a/ssl/quic/quic_channel_local.h
+++ b/ssl/quic/quic_channel_local.h
@@ -456,6 +456,9 @@ struct quic_channel_st {
     /* Inhibit tick for testing purposes? */
     unsigned int                    inhibit_tick                        : 1;
 
+    /* Are we using addressed mode? */
+    unsigned int                    addressed_mode                      : 1;
+
     /* Saved error stack in case permanent error was encountered */
     ERR_STATE                       *err_state;
 };
diff --git a/ssl/quic/quic_txp.c b/ssl/quic/quic_txp.c
index 51802ba7b6..97cba812e7 100644
--- a/ssl/quic/quic_txp.c
+++ b/ssl/quic/quic_txp.c
@@ -555,8 +555,8 @@ int ossl_quic_tx_packetiser_set_peer(OSSL_QUIC_TX_PACKETISER *txp,
                                      const BIO_ADDR *peer)
 {
     if (peer == NULL) {
-        ERR_raise(ERR_LIB_SSL, ERR_R_PASSED_NULL_PARAMETER);
-        return 0;
+        BIO_ADDR_clear(&txp->args.peer);
+        return 1;
     }
 
     txp->args.peer = *peer;