From d13179db3e88ddcca087175e35332c2b04b08770 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Cristian=20Rodr=C3=ADguez?= Date: Thu, 17 Dec 2020 11:27:03 -0300 Subject: [PATCH] connect: on linux, enable reporting of all ICMP errors on UDP sockets The linux kernel does not report all ICMP errors back to userspace due to historical reasons. IP*_RECVERR sockopt must be turned on to have the correct behaviour which is to pass all ICMP errors to userspace. See https://bugzilla.kernel.org/show_bug.cgi?id=202355 Closes #6341 --- lib/connect.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/lib/connect.c b/lib/connect.c index 251145ce18..f7aa260199 100644 --- a/lib/connect.c +++ b/lib/connect.c @@ -1574,6 +1574,20 @@ CURLcode Curl_socket(struct connectdata *conn, } #endif +#if defined(__linux__) && defined(IP_RECVERR) + if(addr->socktype == SOCK_DGRAM) { + int one = 1; + switch(addr->family) { + case AF_INET: + setsockopt(*sockfd, SOL_IP, IP_RECVERR, &one, sizeof(one)); + break; + case AF_INET6: + setsockopt(*sockfd, SOL_IPV6, IPV6_RECVERR, &one, sizeof(one)); + break; + } + } +#endif + return CURLE_OK; } -- 2.47.2