diff options
| author | Alex Elder <elder@linaro.org> | 2021-06-12 09:37:34 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-06-12 13:18:49 -0700 |
| commit | be754f6435936e78dafe0ebb9d1e9d52c3bde842 (patch) | |
| tree | b002f5ed264ec43b08c60e2552851497701ee86f | |
| parent | 698aa6c46bf09070310cd2c8893ea2de5a796644 (diff) | |
net: qualcomm: rmnet: trailer value is a checksum
The csum_value field in the rmnet_map_dl_csum_trailer structure is a
"real" Internet checksum. It is a 16 bit value, in big endian format,
which represents an inverted ones' complement sum over pairs of bytes.
Make that clear by changing its type to __sum16.
This makes a typecast in rmnet_map_ipv4_dl_csum_trailer() and
another in rmnet_map_ipv6_dl_csum_trailer() unnecessary.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c | 5 | ||||
| -rw-r--r-- | include/linux/if_rmnet.h | 2 |
2 files changed, 3 insertions, 4 deletions
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c index 033b8ad3d735..610c8b5a8f46 100644 --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_map_data.c @@ -87,7 +87,7 @@ rmnet_map_ipv4_dl_csum_trailer(struct sk_buff *skb, * header checksum value; it is already accounted for in the * checksum value found in the trailer. */ - ip_payload_csum = (__force __sum16)~csum_trailer->csum_value; + ip_payload_csum = ~csum_trailer->csum_value; pseudo_csum = ~csum_tcpudp_magic(ip4h->saddr, ip4h->daddr, ntohs(ip4h->tot_len) - ip4h->ihl * 4, @@ -132,8 +132,7 @@ rmnet_map_ipv6_dl_csum_trailer(struct sk_buff *skb, * checksum computed over the pseudo header. */ ip_header_csum = (__force __be16)ip_fast_csum(ip6h, sizeof(*ip6h) / 4); - ip6_payload_csum = ~csum16_sub((__force __sum16)csum_trailer->csum_value, - ip_header_csum); + ip6_payload_csum = ~csum16_sub(csum_trailer->csum_value, ip_header_csum); length = (ip6h->nexthdr == IPPROTO_UDP) ? ntohs(((struct udphdr *)txporthdr)->len) : diff --git a/include/linux/if_rmnet.h b/include/linux/if_rmnet.h index be17610a981e..10e7521ecb6c 100644 --- a/include/linux/if_rmnet.h +++ b/include/linux/if_rmnet.h @@ -25,7 +25,7 @@ struct rmnet_map_dl_csum_trailer { u8 flags; /* MAP_CSUM_DL_VALID_FLAG */ __be16 csum_start_offset; __be16 csum_length; - __be16 csum_value; + __sum16 csum_value; } __aligned(1); /* rmnet_map_dl_csum_trailer flags field: |