Date: Tue, 08 May 2018 13:40:57 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 228068] tclass is not used when sending to IPv4 mapped address via IPv6 socket Message-ID: <bug-228068-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228068 Bug ID: 228068 Summary: tclass is not used when sending to IPv4 mapped address via IPv6 socket Product: Base System Version: 11.1-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: preynold.freebsd@gmail.com When sending a udp packet from an IPv6 socket to an IPv4 mapped address, I would expect the setting for IPV6_TCLASS to be used in the TOS IP header field. It does not appear to be. A similar mapping for TTL should be present, though I did not check for that. Can be seen with a simple c program and wireshark: #include <stdio.h> #include <string.h> #include <netinet/in.h> #include <sys/types.h> #include <sys/socket.h> #include <netdb.h> int main() { int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_UDP); if (s < 0) { perror("socket"); return -1; } int value = (40 << 2) & 0xFC; int ret = setsockopt(s, IPPROTO_IPV6, IPV6_TCLASS, &value, sizeof(value)); if (ret < 0) { perror("setsockopt"); return -2; } struct addrinfo hints; memset(&hints, 0, sizeof(hints)); struct addrinfo *res = NULL; ret = getaddrinfo("::ffff:10.10.10.10", "1234", &hints, &res); if (ret != 0) { perror("getaddrinfo"); return -3; } const char *msg = "hello world"; ssize_t n = sendto(s, msg, strlen(msg), 0, res->ai_addr, res->ai_addrlen); if (n < 0) { freeaddrinfo(res); perror("sendto"); return -4; } freeaddrinfo(res); return 0; } -- You are receiving this mail because: You are the assignee for the bug.
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