MFC r264212,r264213,r264248,r265776,r265811,r265909:

- Add support for UDP-Lite protocol (RFC 3828) to IPv4 and IPv6 stacks.
  Tested with vlc and a test suite [1].
  [1] http://www.erg.abdn.ac.uk/~gerrit/udp-lite/files/udplite_linux.tar.gz

  Reviewed by:	jhb, glebius, adrian

- Fix a logic bug which prevented the sending of UDP packet with 0 checksum.

- Disable TX checksum offload for UDP-Lite completely. It wasn't used for
  partial checksum coverage, but even for full checksum coverage it doesn't
  work.

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/libc/net/getaddrinfo.c b/lib/libc/net/getaddrinfo.c
index 495ebc1..00ab796 100644
--- a/lib/libc/net/getaddrinfo.c
+++ b/lib/libc/net/getaddrinfo.c
@@ -170,12 +170,14 @@ static const struct explore explore[] = {
 	{ PF_INET6, SOCK_STREAM, IPPROTO_TCP, 0x07 },
 	{ PF_INET6, SOCK_STREAM, IPPROTO_SCTP, 0x03 },
 	{ PF_INET6, SOCK_SEQPACKET, IPPROTO_SCTP, 0x07 },
+	{ PF_INET6, SOCK_DGRAM, IPPROTO_UDPLITE, 0x03 },
 	{ PF_INET6, SOCK_RAW, ANY, 0x05 },
 #endif
 	{ PF_INET, SOCK_DGRAM, IPPROTO_UDP, 0x07 },
 	{ PF_INET, SOCK_STREAM, IPPROTO_TCP, 0x07 },
 	{ PF_INET, SOCK_STREAM, IPPROTO_SCTP, 0x03 },
 	{ PF_INET, SOCK_SEQPACKET, IPPROTO_SCTP, 0x07 },
+	{ PF_INET, SOCK_DGRAM, IPPROTO_UDPLITE, 0x03 },
 	{ PF_INET, SOCK_RAW, ANY, 0x05 },
 	{ -1, 0, 0, 0 },
 };
@@ -1477,6 +1479,9 @@ get_port(struct addrinfo *ai, const char *servname, int matchonly)
 		case IPPROTO_SCTP:
 			proto = "sctp";
 			break;
+		case IPPROTO_UDPLITE:
+			proto = "udplite";
+			break;
 		default:
 			proto = NULL;
 			break;