Messages in this thread Patch in this message | | | From | Alex Elder <> | Subject | [PATCH net-next 8/8] net: qualcomm: rmnet: IPv6 payload length is simple | Date | Sat, 12 Jun 2021 09:37:36 -0500 |
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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: Alex Elder <elder@linaro.org> --- drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c index ed4737d0043d6..a6ce22f60a00c 100644 --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c @@ -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 -- 2.27.0
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