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quic: ignore EMSGSIZE on receive

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Some OSes (Linux, macOS, more?) will generate an EMSGSIZE socket error
on the next recv all after receiving an ICMP Packet Too Big on an
unconnected UDP socket.

These can be safely ignored as QUIC's DPLPMTUD uses MTU probes that do
not rely on receiving ICMP packets.

Closes #18505
This commit is contained in:
Ethan Everett 2025-09-08 16:50:58 -07:00 • committed by Daniel Stenberg
parent 11b991232f
commit f4758cd524
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GPG key ID: 5CC908FDB71E12C2
1 changed files with 4 additions and 4 deletions
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8
lib/vquic/vquic.c
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@ -404,7 +404,7 @@ static CURLcode recvmmsg_packets(struct Curl_cfilter *cf,
}
while((mcount = recvmmsg(qctx->sockfd, mmsg, n, 0, NULL)) == -1 &&
SOCKERRNO == SOCKEINTR)
(SOCKERRNO == SOCKEINTR || SOCKERRNO == SOCKEMSGSIZE))
;
if(mcount == -1) {
if(SOCKERRNO == EAGAIN || SOCKERRNO == SOCKEWOULDBLOCK) {
@ -420,7 +420,7 @@ static CURLcode recvmmsg_packets(struct Curl_cfilter *cf,
goto out;
}
Curl_strerror(SOCKERRNO, errstr, sizeof(errstr));
failf(data, "QUIC: recvmsg() unexpectedly returned %d (errno=%d; %s)",
failf(data, "QUIC: recvmmsg() unexpectedly returned %d (errno=%d; %s)",
mcount, SOCKERRNO, errstr);
result = CURLE_RECV_ERROR;
goto out;
@ -497,7 +497,7 @@ static CURLcode recvmsg_packets(struct Curl_cfilter *cf,
msg.msg_controllen = sizeof(msg_ctrl);
while((nread = recvmsg(qctx->sockfd, &msg, 0)) == -1 &&
SOCKERRNO == SOCKEINTR)
(SOCKERRNO == SOCKEINTR || SOCKERRNO == SOCKEMSGSIZE))
;
if(nread == -1) {
if(SOCKERRNO == EAGAIN || SOCKERRNO == SOCKEWOULDBLOCK) {
@ -571,7 +571,7 @@ static CURLcode recvfrom_packets(struct Curl_cfilter *cf,
while((nread = recvfrom(qctx->sockfd, (char *)buf, bufsize, 0,
(struct sockaddr *)&remote_addr,
&remote_addrlen)) == -1 &&
SOCKERRNO == SOCKEINTR)
(SOCKERRNO == SOCKEINTR || SOCKERRNO == SOCKEMSGSIZE))
;
if(nread == -1) {
if(SOCKERRNO == EAGAIN || SOCKERRNO == SOCKEWOULDBLOCK) {