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lwip: fix broken default ICMPv6 handling of checksums.

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ICMPv6 should always have checksum generated for it as per RFC 3542
chapter 3.1.

(cherry picked from commit 5e9df2c698)
This commit is contained in:
Knut Andre Tidemann
2017-01-11 12:11:20 +01:00
committed by goldsimon
parent cb97e27120
commit 2694486309
2 changed files with 14 additions and 0 deletions
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8
src/api/api_msg.c
View File

@@ -53,6 +53,7 @@
#include "lwip/dns.h"
#include "lwip/mld6.h"
#include "lwip/priv/tcpip_priv.h"
#include "lwip/sockets.h"
#include <string.h>
@@ -562,6 +563,13 @@ pcb_new(struct api_msg *msg)
case NETCONN_RAW:
msg->conn->pcb.raw = raw_new_ip_type(iptype, msg->msg.n.proto);
if (msg->conn->pcb.raw != NULL) {
#if LWIP_IPV6
/* ICMPv6 packets should always have checksum calculated by the stack as per RFC 3542 chapter 3.1 */
if (NETCONNTYPE_ISIPV6(msg->conn->type) && msg->conn->pcb.raw->protocol == IPPROTO_ICMPV6) {
msg->conn->pcb.raw->chksum_reqd = 1;
msg->conn->pcb.raw->chksum_offset = 2;
}
#endif /* LWIP_IPV6 */
raw_recv(msg->conn->pcb.raw, recv_raw, msg->conn);
}
break;

6
src/api/sockets.c
View File

@@ -2574,6 +2574,12 @@ lwip_setsockopt_impl(int s, int level, int optname, const void *optval, socklen_
switch (optname) {
#if LWIP_IPV6 && LWIP_RAW
case IPV6_CHECKSUM:
/* It should not be possible to disable the checksum generation with ICMPv6
* as per RFC 3542 chapter 3.1 */
if(sock->conn->pcb.raw->protocol == IPPROTO_ICMPV6) {
return EINVAL;
}
LWIP_SOCKOPT_CHECK_OPTLEN_CONN_PCB_TYPE(sock, optlen, int, NETCONN_RAW);
if (*(const int *)optval < 0) {
sock->conn->pcb.raw->chksum_reqd = 0;