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| author | Tom Herbert <tom@herbertland.com> | 2016-04-23 21:46:57 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-04-26 08:27:07 +0300 |
| commit | 90bfe662db13d49cadc6714b0b8ed7e2d0535c5c (patch) | |
| tree | 1f7d7cab0c43d934ddcfa5bb008144c1f6dabf31 /net/ipv6/ila/ila_lwt.c | |
| parent | 642c2c95585dac4ea977140dbb1149fd1e2e7f7f (diff) | |
| download | linux-90bfe662db13d49cadc6714b0b8ed7e2d0535c5c.tar.xz | |
ila: add checksum neutral ILA translations
Support checksum neutral ILA as described in the ILA draft. The low
order 16 bits of the identifier are used to contain the checksum
adjustment value.
The csum-mode parameter is added to described checksum processing. There
are three values:
- adjust transport checksum (previous behavior)
- do checksum neutral mapping
- do nothing
On output the csum-mode in the ila_params is checked and acted on. If
mode is checksum neutral mapping then to mapping and set C-bit.
On input, C-bit is checked. If it is set checksum-netural mapping is
done (regardless of csum-mode in ila params) and C-bit will be cleared.
If it is not set then action in csum-mode is taken.
Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ila/ila_lwt.c')
| -rw-r--r-- | net/ipv6/ila/ila_lwt.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/net/ipv6/ila/ila_lwt.c b/net/ipv6/ila/ila_lwt.c index de7f6d76e928..4985e1a735a6 100644 --- a/net/ipv6/ila/ila_lwt.c +++ b/net/ipv6/ila/ila_lwt.c @@ -53,6 +53,7 @@ drop: static struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = { [ILA_ATTR_LOCATOR] = { .type = NLA_U64, }, + [ILA_ATTR_CSUM_MODE] = { .type = NLA_U8, }, }; static int ila_build_state(struct net_device *dev, struct nlattr *nla, @@ -79,8 +80,10 @@ static int ila_build_state(struct net_device *dev, struct nlattr *nla, iaddr = (struct ila_addr *)&cfg6->fc_dst; - if (!ila_addr_is_ila(iaddr)) { - /* Don't allow setting a translation for a non-ILA address */ + if (!ila_addr_is_ila(iaddr) || ila_csum_neutral_set(iaddr->ident)) { + /* Don't allow translation for a non-ILA address or checksum + * neutral flag to be set. + */ return -EINVAL; } @@ -108,6 +111,11 @@ static int ila_build_state(struct net_device *dev, struct nlattr *nla, p->csum_diff = compute_csum_diff8( (__be32 *)&p->locator_match, (__be32 *)&p->locator); + if (tb[ILA_ATTR_CSUM_MODE]) + p->csum_mode = nla_get_u8(tb[ILA_ATTR_CSUM_MODE]); + + ila_init_saved_csum(p); + newts->type = LWTUNNEL_ENCAP_ILA; newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT | LWTUNNEL_STATE_INPUT_REDIRECT; @@ -125,6 +133,8 @@ static int ila_fill_encap_info(struct sk_buff *skb, if (nla_put_u64_64bit(skb, ILA_ATTR_LOCATOR, (__force u64)p->locator.v64, ILA_ATTR_PAD)) goto nla_put_failure; + if (nla_put_u64(skb, ILA_ATTR_CSUM_MODE, (__force u8)p->csum_mode)) + goto nla_put_failure; return 0; |