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net: sched: act_tunnel_key: make UDP checksum configurable

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Allow requesting of zero UDP checksum for encapsulated packets. The name and
meaning of the attribute is "NO_CSUM" in order to have the same meaning of
the attribute missing and being 0.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Benc 2017-06-14 21:19:31 +02:00 committed by David S. Miller
parent 63fe4c39d2
commit 86087e170c
2 changed files with 13 additions and 3 deletions
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1
include/uapi/linux/tc_act/tc_tunnel_key.h
View file

@ -34,6 +34,7 @@ enum {
TCA_TUNNEL_KEY_ENC_KEY_ID, /* be64 */
TCA_TUNNEL_KEY_PAD,
TCA_TUNNEL_KEY_ENC_DST_PORT, /* be16 */
TCA_TUNNEL_KEY_NO_CSUM, /* u8 */
__TCA_TUNNEL_KEY_MAX,
};

15
net/sched/act_tunnel_key.c
View file

@ -67,6 +67,7 @@ static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
[TCA_TUNNEL_KEY_ENC_IPV6_DST] = { .len = sizeof(struct in6_addr) },
[TCA_TUNNEL_KEY_ENC_KEY_ID] = { .type = NLA_U32 },
[TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
[TCA_TUNNEL_KEY_NO_CSUM] = { .type = NLA_U8 },
};
static int tunnel_key_init(struct net *net, struct nlattr *nla,
@ -83,6 +84,7 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
bool exists = false;
__be16 dst_port = 0;
__be64 key_id;
__be16 flags;
int ret = 0;
int err;
@ -113,6 +115,11 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
key_id = key32_to_tunnel_id(nla_get_be32(tb[TCA_TUNNEL_KEY_ENC_KEY_ID]));
flags = TUNNEL_KEY | TUNNEL_CSUM;
if (tb[TCA_TUNNEL_KEY_NO_CSUM] &&
nla_get_u8(tb[TCA_TUNNEL_KEY_NO_CSUM]))
flags &= ~TUNNEL_CSUM;
if (tb[TCA_TUNNEL_KEY_ENC_DST_PORT])
dst_port = nla_get_be16(tb[TCA_TUNNEL_KEY_ENC_DST_PORT]);
@ -125,7 +132,7 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
metadata = __ip_tun_set_dst(saddr, daddr, 0, 0,
dst_port, TUNNEL_KEY | TUNNEL_CSUM,
dst_port, flags,
key_id, 0);
} else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]) {
@ -136,7 +143,7 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
metadata = __ipv6_tun_set_dst(&saddr, &daddr, 0, 0, dst_port,
0, TUNNEL_KEY | TUNNEL_CSUM,
0, flags,
key_id, 0);
}
@ -266,7 +273,9 @@ static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
if (nla_put_be32(skb, TCA_TUNNEL_KEY_ENC_KEY_ID, key_id) ||
tunnel_key_dump_addresses(skb,
&params->tcft_enc_metadata->u.tun_info) ||
nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT, key->tp_dst))
nla_put_be16(skb, TCA_TUNNEL_KEY_ENC_DST_PORT, key->tp_dst) ||
nla_put_u8(skb, TCA_TUNNEL_KEY_NO_CSUM,
!(key->tun_flags & TUNNEL_CSUM)))
goto nla_put_failure;
}