diff options
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/ila.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/net/ipv6/ila.c b/net/ipv6/ila.c index ffe4dcad6088..678d2df4b8d9 100644 --- a/net/ipv6/ila.c +++ b/net/ipv6/ila.c @@ -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; |