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Implemented socket options SO_NO_CHECK for UDP sockets to disable UDP checksum generation on transmit.

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goldsimon
2007-06-17 11:46:30 +00:00
parent 1db9013bc4
commit ea7b0052f3
3 changed files with 23 additions and 1 deletions
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17
src/api/sockets.c
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@@ -1338,6 +1338,16 @@ int lwip_setsockopt(int s, int level, int optname, const void *optval, socklen_t
err = EINVAL;
}
break;
case SO_NO_CHECK:
if (optlen < sizeof(int)) {
err = EINVAL;
}
if ((sock->conn->type != NETCONN_UDP) ||
((sock->conn->pcb.udp->flags & UDP_FLAGS_UDPLITE) == 1)) {
/* this flag is only available for UDP, not for UDP lite */
err = EAFNOSUPPORT;
}
break;
default:
LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, SOL_SOCKET, UNIMPL: optname=0x%x, ..)\n",
s, optname));
@@ -1512,6 +1522,13 @@ static void lwip_setsockopt_internal(void *arg)
sock->conn->recv_timeout = ( *(int*)optval );
break;
#endif /* LWIP_SO_RCVTIMEO */
case SO_NO_CHECK:
if (*(int*)optval) {
udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) | UDP_FLAGS_NOCHKSUM);
} else {
udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) & ~UDP_FLAGS_NOCHKSUM);
}
break;
} /* switch (optname) */
break;

3
src/include/lwip/sockets.h
View File

@@ -94,6 +94,7 @@ struct sockaddr {
#define SO_ERROR 0x1007 /* get error status and clear */
#define SO_TYPE 0x1008 /* get socket type */
#define SO_CONTIMEO 0x1009 /* connect timeout */
#define SO_NO_CHECK 0x100a /* don't create UDP checksum */
/*
@@ -150,7 +151,7 @@ struct linger {
*/
#define UDPLITE_SEND_CSCOV 0x01 /* sender checksum coverage */
#define UDPLITE_RECV_CSCOV 0x02 /* minimal receiver checksum coverage */
#endif
#endif /* LWIP_UDP && LWIP_UDPLITE*/
#if LWIP_IGMP