Commit 185a108f authored by Alex Elder's avatar Alex Elder Committed by David S. Miller
Browse files

net: qualcomm: rmnet: IPv6 payload length is simple 



We don't support any extension headers for IPv6 packets.  Extension
headers therefore contribute 0 bytes to the payload length.  As a
result we can just use the IPv6 payload length as the length used to
compute the pseudo header checksum for both UDP and TCP messages.

Signed-off-by: default avatarAlex Elder <elder@linaro.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 411a795e

drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c

+2 −5
Original line number Diff line number Diff line
@@ -114,7 +114,6 @@ rmnet_map_ipv6_dl_csum_trailer(struct sk_buff *skb, 
	__sum16 *csum_field, pseudo_csum;

	__sum16 ip6_payload_csum;

	__be16 ip_header_csum;

	u32 length;



	/* Checksum offload is only supported for UDP and TCP protocols;

	 * the packet cannot include any IPv6 extension headers
@@ -134,11 +133,9 @@ rmnet_map_ipv6_dl_csum_trailer(struct sk_buff *skb, 
	ip_header_csum = (__force __be16)ip_fast_csum(ip6h, sizeof(*ip6h) / 4);

	ip6_payload_csum = csum16_sub(csum_trailer->csum_value, ip_header_csum);



	length = (ip6h->nexthdr == IPPROTO_UDP) ?

		 ntohs(((struct udphdr *)txporthdr)->len) :

		 ntohs(ip6h->payload_len);

	pseudo_csum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,

				      length, ip6h->nexthdr, 0);

				      ntohs(ip6h->payload_len),

				      ip6h->nexthdr, 0);



	/* It's sufficient to compare the IP payload checksum with the

	 * negated pseudo checksum to determine whether the packet