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udp: Generic functions to set checksum

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Added udp_set_csum and udp6_set_csum functions to set UDP checksums
in packets. These are for simple UDP packets such as those that might
be created in UDP tunnels.

Signed-off-by: Tom Herbert <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Tom Herbert 2014-06-04 17:19:48 -07:00 • committed by David S. Miller
commit af5fcba7f3
4 changed files with 96 additions and 0 deletions
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38
net/ipv6/ip6_checksum.c
View file

@ -84,3 +84,41 @@ int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto)
ip6_compute_pseudo);
}
EXPORT_SYMBOL(udp6_csum_init);
/* Function to set UDP checksum for an IPv6 UDP packet. This is intended
* for the simple case like when setting the checksum for a UDP tunnel.
*/
void udp6_set_csum(bool nocheck, struct sk_buff *skb,
const struct in6_addr *saddr,
const struct in6_addr *daddr, int len)
{
struct udphdr *uh = udp_hdr(skb);
if (nocheck)
uh->check = 0;
else if (skb_is_gso(skb))
uh->check = ~udp_v6_check(len, saddr, daddr, 0);
else if (skb_dst(skb) && skb_dst(skb)->dev &&
(skb_dst(skb)->dev->features & NETIF_F_IPV6_CSUM)) {
BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
skb->ip_summed = CHECKSUM_PARTIAL;
skb->csum_start = skb_transport_header(skb) - skb->head;
skb->csum_offset = offsetof(struct udphdr, check);
uh->check = ~udp_v6_check(len, saddr, daddr, 0);
} else {
__wsum csum;
BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
uh->check = 0;
csum = skb_checksum(skb, 0, len, 0);
uh->check = udp_v6_check(len, saddr, daddr, csum);
if (uh->check == 0)
uh->check = CSUM_MANGLED_0;
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
}
EXPORT_SYMBOL(udp6_set_csum);