100 lines
2.4 KiB
C
100 lines
2.4 KiB
C
#include <net/ip.h>
|
|
#include <net/udp.h>
|
|
#include <net/udplite.h>
|
|
#include <asm/checksum.h>
|
|
|
|
#ifndef _HAVE_ARCH_IPV6_CSUM
|
|
__sum16 csum_ipv6_magic(const struct in6_addr *saddr,
|
|
const struct in6_addr *daddr,
|
|
__u32 len, unsigned short proto,
|
|
__wsum csum)
|
|
{
|
|
|
|
int carry;
|
|
__u32 ulen;
|
|
__u32 uproto;
|
|
__u32 sum = (__force u32)csum;
|
|
|
|
sum += (__force u32)saddr->s6_addr32[0];
|
|
carry = (sum < (__force u32)saddr->s6_addr32[0]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)saddr->s6_addr32[1];
|
|
carry = (sum < (__force u32)saddr->s6_addr32[1]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)saddr->s6_addr32[2];
|
|
carry = (sum < (__force u32)saddr->s6_addr32[2]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)saddr->s6_addr32[3];
|
|
carry = (sum < (__force u32)saddr->s6_addr32[3]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)daddr->s6_addr32[0];
|
|
carry = (sum < (__force u32)daddr->s6_addr32[0]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)daddr->s6_addr32[1];
|
|
carry = (sum < (__force u32)daddr->s6_addr32[1]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)daddr->s6_addr32[2];
|
|
carry = (sum < (__force u32)daddr->s6_addr32[2]);
|
|
sum += carry;
|
|
|
|
sum += (__force u32)daddr->s6_addr32[3];
|
|
carry = (sum < (__force u32)daddr->s6_addr32[3]);
|
|
sum += carry;
|
|
|
|
ulen = (__force u32)htonl((__u32) len);
|
|
sum += ulen;
|
|
carry = (sum < ulen);
|
|
sum += carry;
|
|
|
|
uproto = (__force u32)htonl(proto);
|
|
sum += uproto;
|
|
carry = (sum < uproto);
|
|
sum += carry;
|
|
|
|
return csum_fold((__force __wsum)sum);
|
|
}
|
|
EXPORT_SYMBOL(csum_ipv6_magic);
|
|
#endif
|
|
|
|
int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto)
|
|
{
|
|
int err;
|
|
|
|
UDP_SKB_CB(skb)->partial_cov = 0;
|
|
UDP_SKB_CB(skb)->cscov = skb->len;
|
|
|
|
if (proto == IPPROTO_UDPLITE) {
|
|
err = udplite_checksum_init(skb, uh);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (uh->check == 0) {
|
|
/* RFC 2460 section 8.1 says that we SHOULD log
|
|
this error. Well, it is reasonable.
|
|
*/
|
|
LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n",
|
|
&ipv6_hdr(skb)->saddr, ntohs(uh->source),
|
|
&ipv6_hdr(skb)->daddr, ntohs(uh->dest));
|
|
return 1;
|
|
}
|
|
if (skb->ip_summed == CHECKSUM_COMPLETE &&
|
|
!csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
|
|
skb->len, proto, skb->csum))
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
|
|
if (!skb_csum_unnecessary(skb))
|
|
skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
|
|
&ipv6_hdr(skb)->daddr,
|
|
skb->len, proto, 0));
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(udp6_csum_init);
|