> On 30 Nov 2023, at 15:05, Roman Arutyunyan <a...@nginx.com> wrote: > > # HG changeset patch > # User Roman Arutyunyan <a...@nginx.com> > # Date 1701241101 -14400 > # Wed Nov 29 10:58:21 2023 +0400 > # Node ID 82fa5941af6fecb4fc7f0ac6308ae6c266d5e545 > # Parent 4b7663d9146ce9baeb78fb57c3fed7368f25dae9 > QUIC: path revalidation after expansion failure. > > As per RFC 9000, Section 8.2.1: > > When an endpoint is unable to expand the datagram size to 1200 bytes due > to the anti-amplification limit, the path MTU will not be validated. > To ensure that the path MTU is large enough, the endpoint MUST perform a > second path validation by sending a PATH_CHALLENGE frame in a datagram of > at least 1200 bytes. > > diff --git a/src/event/quic/ngx_event_quic_connection.h > b/src/event/quic/ngx_event_quic_connection.h > --- a/src/event/quic/ngx_event_quic_connection.h > +++ b/src/event/quic/ngx_event_quic_connection.h > @@ -111,7 +111,8 @@ struct ngx_quic_path_s { > uint64_t mtu_pnum[NGX_QUIC_PATH_RETRIES]; > ngx_str_t addr_text; > u_char text[NGX_SOCKADDR_STRLEN]; > - ngx_uint_t validated; /* unsigned validated:1; */ > + unsigned validated:1; > + unsigned mtu_unvalidated:1; > }; > > > diff --git a/src/event/quic/ngx_event_quic_migration.c > b/src/event/quic/ngx_event_quic_migration.c > --- a/src/event/quic/ngx_event_quic_migration.c > +++ b/src/event/quic/ngx_event_quic_migration.c > @@ -169,6 +169,7 @@ valid: > > path->mtu = prev->mtu; > path->max_mtu = prev->max_mtu; > + path->mtu_unvalidated = 0; > } > } > > @@ -182,6 +183,13 @@ valid: > qc->congestion.recovery_start = ngx_current_msec; > } > > + path->validated = 1; > + > + if (path->mtu_unvalidated) { > + path->mtu_unvalidated = 0; > + return ngx_quic_validate_path(c, path); > + } > + > /* > * RFC 9000, 9.3. Responding to Connection Migration > * > @@ -199,8 +207,6 @@ valid: > > ngx_quic_path_dbg(c, "is validated", path); > > - path->validated = 1; > - > ngx_quic_discover_path_mtu(c, path); > > return NGX_OK; > @@ -578,7 +584,15 @@ ngx_quic_send_path_challenge(ngx_connect > * sending a datagram of this size. > */ > > - min = (ngx_quic_path_limit(c, path, 1200) < 1200) ? 0 : 1200; > + if (path->mtu_unvalidated > + || ngx_quic_path_limit(c, path, 1200) < 1200) > + { > + min = 0; > + path->mtu_unvalidated = 1; > + > + } else { > + min = 1200; > + } > > if (ngx_quic_frame_sendto(c, frame, min, path) == NGX_ERROR) { > return NGX_ERROR;
This needs the following fixup, path->validated is now a bit-mask. # HG changeset patch # User Sergey Kandaurov <pluk...@nginx.com> # Date 1702643887 -14400 # Fri Dec 15 16:38:07 2023 +0400 # Node ID 763803589a36e3c67cbe39dd324b4e91fe57ecb7 # Parent cbe1a0e8094be744b940fe1b0cc5314f99c94672 QUIC: fixed format specifier after a6f79f044de5. diff --git a/src/event/quic/ngx_event_quic_migration.h b/src/event/quic/ngx_event_quic_migration.h --- a/src/event/quic/ngx_event_quic_migration.h +++ b/src/event/quic/ngx_event_quic_migration.h @@ -19,7 +19,7 @@ #define ngx_quic_path_dbg(c, msg, path) \ ngx_log_debug7(NGX_LOG_DEBUG_EVENT, c->log, 0, \ - "quic path seq:%uL %s tx:%O rx:%O valid:%ui st:%d mtu:%uz",\ + "quic path seq:%uL %s tx:%O rx:%O valid:%d st:%d mtu:%uz", \ path->seqnum, msg, path->sent, path->received, \ path->validated, path->state, path->mtu); -- Sergey Kandaurov _______________________________________________ nginx-devel mailing list nginx-devel@nginx.org https://mailman.nginx.org/mailman/listinfo/nginx-devel