Commit 2cf545e8 authored by Patrick McHardy's avatar Patrick McHardy Committed by Pablo Neira Ayuso
Browse files

net: core: add function for incremental IPv6 pseudo header checksum updates 



Add inet_proto_csum_replace16 for incrementally updating IPv6 pseudo header
checksums for IPv6 NAT.

Signed-off-by: default avatarPatrick McHardy <kaber@trash.net>
Acked-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0ad352cb

include/net/checksum.h

+3 −0
Original line number Diff line number Diff line
@@ -109,6 +109,9 @@ static inline void csum_replace2(__sum16 *sum, __be16 from, __be16 to) 
struct sk_buff;

extern void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb,

				     __be32 from, __be32 to, int pseudohdr);

extern void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,

				      const __be32 *from, const __be32 *to,

				      int pseudohdr);



static inline void inet_proto_csum_replace2(__sum16 *sum, struct sk_buff *skb,

					    __be16 from, __be16 to,

net/core/utils.c

+20 −0
Original line number Diff line number Diff line
@@ -294,6 +294,26 @@ void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb, 
}

EXPORT_SYMBOL(inet_proto_csum_replace4);



void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb,

			       const __be32 *from, const __be32 *to,

			       int pseudohdr)

{

	__be32 diff[] = {

		~from[0], ~from[1], ~from[2], ~from[3],

		to[0], to[1], to[2], to[3],

	};

	if (skb->ip_summed != CHECKSUM_PARTIAL) {

		*sum = csum_fold(csum_partial(diff, sizeof(diff),

				 ~csum_unfold(*sum)));

		if (skb->ip_summed == CHECKSUM_COMPLETE && pseudohdr)

			skb->csum = ~csum_partial(diff, sizeof(diff),

						  ~skb->csum);

	} else if (pseudohdr)

		*sum = ~csum_fold(csum_partial(diff, sizeof(diff),

				  csum_unfold(*sum)));

}

EXPORT_SYMBOL(inet_proto_csum_replace16);



int mac_pton(const char *s, u8 *mac)

{

	int i;