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nghttpx: Reduce dgram size if sendmsg fails with EINVAL or EMSGSIZE

This commit is contained in:
Tatsuhiro Tsujikawa 2021-10-18 22:37:16 +09:00
parent 15a8d913ea
commit f8474b25f0
3 changed files with 63 additions and 31 deletions
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82
src/shrpx_http3_upstream.cc
View File

@ -118,6 +118,7 @@ size_t downstream_queue_size(Worker *worker) {
Http3Upstream::Http3Upstream(ClientHandler *handler)
: handler_{handler},
max_udp_payload_size_{SHRPX_QUIC_MAX_UDP_PAYLOAD_SIZE},
qlog_fd_{-1},
hashed_scid_{},
conn_{nullptr},
@ -707,7 +708,8 @@ int Http3Upstream::on_write() {
int Http3Upstream::write_streams() {
std::array<nghttp3_vec, 16> vec;
std::array<uint8_t, 64_k> buf;
auto max_udp_payload_size = ngtcp2_conn_get_path_max_udp_payload_size(conn_);
auto max_udp_payload_size = std::min(
max_udp_payload_size_, ngtcp2_conn_get_path_max_udp_payload_size(conn_));
size_t max_pktcnt =
std::min(static_cast<size_t>(64_k), ngtcp2_conn_get_send_quantum(conn_)) /
max_udp_payload_size;
@ -812,10 +814,10 @@ int Http3Upstream::write_streams() {
if (nwrite == 0) {
if (bufpos - buf.data()) {
quic_send_packet(static_cast<UpstreamAddr *>(prev_ps.path.user_data),
prev_ps.path.remote.addr, prev_ps.path.remote.addrlen,
prev_ps.path.local.addr, prev_ps.path.local.addrlen,
buf.data(), bufpos - buf.data(), max_udp_payload_size);
send_packet(static_cast<UpstreamAddr *>(prev_ps.path.user_data),
prev_ps.path.remote.addr, prev_ps.path.remote.addrlen,
prev_ps.path.local.addr, prev_ps.path.local.addrlen,
buf.data(), bufpos - buf.data(), max_udp_payload_size);
reset_idle_timer();
}
@ -833,16 +835,16 @@ int Http3Upstream::write_streams() {
if (pktcnt == 0) {
ngtcp2_path_copy(&prev_ps.path, &ps.path);
} else if (!ngtcp2_path_eq(&prev_ps.path, &ps.path)) {
quic_send_packet(static_cast<UpstreamAddr *>(prev_ps.path.user_data),
prev_ps.path.remote.addr, prev_ps.path.remote.addrlen,
prev_ps.path.local.addr, prev_ps.path.local.addrlen,
buf.data(), bufpos - buf.data() - nwrite,
max_udp_payload_size);
send_packet(static_cast<UpstreamAddr *>(prev_ps.path.user_data),
prev_ps.path.remote.addr, prev_ps.path.remote.addrlen,
prev_ps.path.local.addr, prev_ps.path.local.addrlen,
buf.data(), bufpos - buf.data() - nwrite,
max_udp_payload_size);
quic_send_packet(static_cast<UpstreamAddr *>(ps.path.user_data),
ps.path.remote.addr, ps.path.remote.addrlen,
ps.path.local.addr, ps.path.local.addrlen,
bufpos - nwrite, nwrite, max_udp_payload_size);
send_packet(static_cast<UpstreamAddr *>(ps.path.user_data),
ps.path.remote.addr, ps.path.remote.addrlen,
ps.path.local.addr, ps.path.local.addrlen, bufpos - nwrite,
nwrite, max_udp_payload_size);
ngtcp2_conn_update_pkt_tx_time(conn_, ts);
reset_idle_timer();
@ -854,10 +856,10 @@ int Http3Upstream::write_streams() {
if (++pktcnt == max_pktcnt ||
static_cast<size_t>(nwrite) < max_udp_payload_size) {
quic_send_packet(static_cast<UpstreamAddr *>(ps.path.user_data),
ps.path.remote.addr, ps.path.remote.addrlen,
ps.path.local.addr, ps.path.local.addrlen, buf.data(),
bufpos - buf.data(), max_udp_payload_size);
send_packet(static_cast<UpstreamAddr *>(ps.path.user_data),
ps.path.remote.addr, ps.path.remote.addrlen,
ps.path.local.addr, ps.path.local.addrlen, buf.data(),
bufpos - buf.data(), max_udp_payload_size);
ngtcp2_conn_update_pkt_tx_time(conn_, ts);
reset_idle_timer();
@ -867,10 +869,9 @@ int Http3Upstream::write_streams() {
return 0;
}
#else // !UDP_SEGMENT
quic_send_packet(static_cast<UpstreamAddr *>(ps.path.user_data),
ps.path.remote.addr, ps.path.remote.addrlen,
ps.path.local.addr, ps.path.local.addrlen, buf.data(),
bufpos - buf.data(), 0);
send_packet(static_cast<UpstreamAddr *>(ps.path.user_data),
ps.path.remote.addr, ps.path.remote.addrlen, ps.path.local.addr,
ps.path.local.addrlen, buf.data(), bufpos - buf.data(), 0);
if (++pktcnt == max_pktcnt) {
ngtcp2_conn_update_pkt_tx_time(conn_, ts);
@ -1410,10 +1411,9 @@ void Http3Upstream::on_handler_delete() {
conn_close_.resize(nwrite);
quic_send_packet(static_cast<UpstreamAddr *>(ps.path.user_data),
ps.path.remote.addr, ps.path.remote.addrlen,
ps.path.local.addr, ps.path.local.addrlen,
conn_close_.data(), nwrite, 0);
send_packet(static_cast<UpstreamAddr *>(ps.path.user_data),
ps.path.remote.addr, ps.path.remote.addrlen, ps.path.local.addr,
ps.path.local.addrlen, conn_close_.data(), nwrite, 0);
}
auto d =
@ -1716,6 +1716,29 @@ int Http3Upstream::on_read(const UpstreamAddr *faddr,
return 0;
}
int Http3Upstream::send_packet(const UpstreamAddr *faddr,
const sockaddr *remote_sa, size_t remote_salen,
const sockaddr *local_sa, size_t local_salen,
const uint8_t *data, size_t datalen,
size_t gso_size) {
auto rv = quic_send_packet(faddr, remote_sa, remote_salen, local_sa,
local_salen, data, datalen, gso_size);
switch (rv) {
case 0:
return 0;
// With GSO, sendmsg may fail with EINVAL if UDP payload is too
// large.
case -EINVAL:
case -EMSGSIZE:
max_udp_payload_size_ = NGTCP2_MAX_UDP_PAYLOAD_SIZE;
break;
default:
break;
}
return -1;
}
int Http3Upstream::handle_error() {
if (ngtcp2_conn_is_in_closing_period(conn_)) {
return -1;
@ -1754,10 +1777,9 @@ int Http3Upstream::handle_error() {
conn_close_.resize(nwrite);
quic_send_packet(static_cast<UpstreamAddr *>(ps.path.user_data),
ps.path.remote.addr, ps.path.remote.addrlen,
ps.path.local.addr, ps.path.local.addrlen,
conn_close_.data(), nwrite, 0);
send_packet(static_cast<UpstreamAddr *>(ps.path.user_data),
ps.path.remote.addr, ps.path.remote.addrlen, ps.path.local.addr,
ps.path.local.addrlen, conn_close_.data(), nwrite, 0);
return -1;
}

5
src/shrpx_http3_upstream.h
View File

@ -148,6 +148,10 @@ public:
int start_graceful_shutdown();
int submit_goaway();
void idle_close();
int send_packet(const UpstreamAddr *faddr, const sockaddr *remote_sa,
size_t remote_salen, const sockaddr *local_sa,
size_t local_salen, const uint8_t *data, size_t datalen,
size_t gso_size);
void qlog_write(const void *data, size_t datalen, bool fin);
int open_qlog_file(const StringRef &dir, const ngtcp2_cid &scid) const;
@ -158,6 +162,7 @@ private:
ev_timer idle_timer_;
ev_timer shutdown_timer_;
ev_prepare prep_;
size_t max_udp_payload_size_;
int qlog_fd_;
ngtcp2_cid hashed_scid_;
ngtcp2_conn *conn_;

7
src/shrpx_quic.cc
View File

@ -130,7 +130,12 @@ int quic_send_packet(const UpstreamAddr *faddr, const sockaddr *remote_sa,
} while (nwrite == -1 && errno == EINTR);
if (nwrite == -1) {
return -1;
if (LOG_ENABLED(INFO)) {
auto error = errno;
LOG(INFO) << "sendmsg failed: errno=" << error;
}
return -errno;
}
if (LOG_ENABLED(INFO)) {