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| author | Li RongQing <roy.qing.li@gmail.com> | 2013-06-06 14:35:18 +0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-06-11 02:34:36 -0700 |
| commit | 8249152c472e10c18936b774737fd58c60335154 (patch) | |
| tree | aa760c3d66169704edae39b35dc1749d02f676d1 | |
| parent | 2e42206948c98fdd32b64094264419a47ee2718c (diff) | |
| download | linux-8249152c472e10c18936b774737fd58c60335154.tar.gz linux-8249152c472e10c18936b774737fd58c60335154.tar.bz2 linux-8249152c472e10c18936b774737fd58c60335154.zip | |
xen-netfront: use skb_partial_csum_set() to simplify the codes
use skb_partial_csum_set() to simplify the codes
Cc: Jason Wang <jasowang@redhat.com>
Signed-off-by: Li RongQing <roy.qing.li@gmail.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/xen-netfront.c | 20 |
1 files changed, 8 insertions, 12 deletions
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c index 62238a08cb51..76a22365d4e9 100644 --- a/drivers/net/xen-netfront.c +++ b/drivers/net/xen-netfront.c @@ -858,7 +858,6 @@ static RING_IDX xennet_fill_frags(struct netfront_info *np, static int checksum_setup(struct net_device *dev, struct sk_buff *skb) { struct iphdr *iph; - unsigned char *th; int err = -EPROTO; int recalculate_partial_csum = 0; @@ -883,27 +882,27 @@ static int checksum_setup(struct net_device *dev, struct sk_buff *skb) goto out; iph = (void *)skb->data; - th = skb->data + 4 * iph->ihl; - if (th >= skb_tail_pointer(skb)) - goto out; - skb->csum_start = th - skb->head; switch (iph->protocol) { case IPPROTO_TCP: - skb->csum_offset = offsetof(struct tcphdr, check); + if (!skb_partial_csum_set(skb, 4 * iph->ihl, + offsetof(struct tcphdr, check))) + goto out; if (recalculate_partial_csum) { - struct tcphdr *tcph = (struct tcphdr *)th; + struct tcphdr *tcph = tcp_hdr(skb); tcph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len - iph->ihl*4, IPPROTO_TCP, 0); } break; case IPPROTO_UDP: - skb->csum_offset = offsetof(struct udphdr, check); + if (!skb_partial_csum_set(skb, 4 * iph->ihl, + offsetof(struct udphdr, check))) + goto out; if (recalculate_partial_csum) { - struct udphdr *udph = (struct udphdr *)th; + struct udphdr *udph = udp_hdr(skb); udph->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len - iph->ihl*4, IPPROTO_UDP, 0); @@ -917,9 +916,6 @@ static int checksum_setup(struct net_device *dev, struct sk_buff *skb) goto out; } - if ((th + skb->csum_offset + 2) > skb_tail_pointer(skb)) - goto out; - err = 0; out: |