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ila: Precompute checksum difference for translations

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In the ILA build state for LWT compute the checksum difference to apply
to transport checksums that include the IPv6 pseudo header. The
difference is between the route destination (from fib6_config) and the
locator to write.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2015-08-24 09:45:42 -07:00 committed by David S. Miller
parent 127eb7cd3c
commit 92b78aff85
1 changed files with 18 additions and 0 deletions
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18
net/ipv6/ila.c
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@ -14,6 +14,8 @@
struct ila_params {
__be64 locator;
__be64 locator_match;
__wsum csum_diff;
};
static inline struct ila_params *ila_params_lwtunnel(
@ -33,6 +35,9 @@ static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to)
static inline __wsum get_csum_diff(struct ipv6hdr *ip6h, struct ila_params *p)
{
if (*(__be64 *)&ip6h->daddr == p->locator_match)
return p->csum_diff;
else
return compute_csum_diff8((__be32 *)&ip6h->daddr,
(__be32 *)&p->locator);
}
@ -130,8 +135,12 @@ static int ila_build_state(struct net_device *dev, struct nlattr *nla,
struct nlattr *tb[ILA_ATTR_MAX + 1];
size_t encap_len = sizeof(*p);
struct lwtunnel_state *newts;
const struct fib6_config *cfg6 = cfg;
int ret;
if (family != AF_INET6)
return -EINVAL;
ret = nla_parse_nested(tb, ILA_ATTR_MAX, nla,
ila_nl_policy);
if (ret < 0)
@ -149,6 +158,15 @@ static int ila_build_state(struct net_device *dev, struct nlattr *nla,
p->locator = (__force __be64)nla_get_u64(tb[ILA_ATTR_LOCATOR]);
if (cfg6->fc_dst_len > sizeof(__be64)) {
/* Precompute checksum difference for translation since we
* know both the old locator and the new one.
*/
p->locator_match = *(__be64 *)&cfg6->fc_dst;
p->csum_diff = compute_csum_diff8(
(__be32 *)&p->locator_match, (__be32 *)&p->locator);
}
newts->type = LWTUNNEL_ENCAP_ILA;
newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT |
LWTUNNEL_STATE_INPUT_REDIRECT;