netdev - [PATCH net-next 1/3] net/sched: tunnel_key: Allow to set tos and ttl for tc based ip tunnels

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Date:   Tue, 17 Jul 2018 19:27:16 +0300
From:   Or Gerlitz <ogerlitz@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Or Gerlitz <ogerlitz@...lanox.com>
Subject: [PATCH net-next 1/3] net/sched: tunnel_key: Allow to set tos and ttl for tc based ip tunnels

Allow user-space to provide tos and ttl to be set for the tunnel headers.

Signed-off-by: Or Gerlitz <ogerlitz@...lanox.com>
Reviewed-by: Roi Dayan <roid@...lanox.com>
Acked-by: Jiri Pirko <jiri@...lanox.com>
---
 include/uapi/linux/tc_act/tc_tunnel_key.h |  2 ++
 net/sched/act_tunnel_key.c                | 20 ++++++++++++++++++--
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/include/uapi/linux/tc_act/tc_tunnel_key.h b/include/uapi/linux/tc_act/tc_tunnel_key.h
index e284fec..be384d63 100644
--- a/include/uapi/linux/tc_act/tc_tunnel_key.h
+++ b/include/uapi/linux/tc_act/tc_tunnel_key.h
@@ -39,6 +39,8 @@ enum {
 	TCA_TUNNEL_KEY_ENC_OPTS,	/* Nested TCA_TUNNEL_KEY_ENC_OPTS_
 					 * attributes
 					 */
+	TCA_TUNNEL_KEY_ENC_TOS,		/* u8 */
+	TCA_TUNNEL_KEY_ENC_TTL,		/* u8 */
 	__TCA_TUNNEL_KEY_MAX,
 };
 
diff --git a/net/sched/act_tunnel_key.c b/net/sched/act_tunnel_key.c
index 3ec585d5..22f26e9 100644
--- a/net/sched/act_tunnel_key.c
+++ b/net/sched/act_tunnel_key.c
@@ -197,6 +197,8 @@ static const struct nla_policy tunnel_key_policy[TCA_TUNNEL_KEY_MAX + 1] = {
 	[TCA_TUNNEL_KEY_ENC_DST_PORT] = {.type = NLA_U16},
 	[TCA_TUNNEL_KEY_NO_CSUM]      = { .type = NLA_U8 },
 	[TCA_TUNNEL_KEY_ENC_OPTS]     = { .type = NLA_NESTED },
+	[TCA_TUNNEL_KEY_ENC_TOS]      = { .type = NLA_U8 },
+	[TCA_TUNNEL_KEY_ENC_TTL]      = { .type = NLA_U8 },
 };
 
 static int tunnel_key_init(struct net *net, struct nlattr *nla,
@@ -216,6 +218,7 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
 	int opts_len = 0;
 	__be64 key_id;
 	__be16 flags;
+	u8 tos, ttl;
 	int ret = 0;
 	int err;
 
@@ -273,6 +276,13 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
 			}
 		}
 
+		tos = 0;
+		if (tb[TCA_TUNNEL_KEY_ENC_TOS])
+			tos = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TOS]);
+		ttl = 0;
+		if (tb[TCA_TUNNEL_KEY_ENC_TTL])
+			ttl = nla_get_u8(tb[TCA_TUNNEL_KEY_ENC_TTL]);
+
 		if (tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC] &&
 		    tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]) {
 			__be32 saddr;
@@ -281,7 +291,7 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
 			saddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_SRC]);
 			daddr = nla_get_in_addr(tb[TCA_TUNNEL_KEY_ENC_IPV4_DST]);
 
-			metadata = __ip_tun_set_dst(saddr, daddr, 0, 0,
+			metadata = __ip_tun_set_dst(saddr, daddr, tos, ttl,
 						    dst_port, flags,
 						    key_id, opts_len);
 		} else if (tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC] &&
@@ -292,7 +302,7 @@ static int tunnel_key_init(struct net *net, struct nlattr *nla,
 			saddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_SRC]);
 			daddr = nla_get_in6_addr(tb[TCA_TUNNEL_KEY_ENC_IPV6_DST]);
 
-			metadata = __ipv6_tun_set_dst(&saddr, &daddr, 0, 0, dst_port,
+			metadata = __ipv6_tun_set_dst(&saddr, &daddr, tos, ttl, dst_port,
 						      0, flags,
 						      key_id, 0);
 		} else {
@@ -504,6 +514,12 @@ static int tunnel_key_dump(struct sk_buff *skb, struct tc_action *a,
 			       !(key->tun_flags & TUNNEL_CSUM)) ||
 		    tunnel_key_opts_dump(skb, info))
 			goto nla_put_failure;
+
+		if (key->tos && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TOS, key->tos))
+			goto nla_put_failure;
+
+		if (key->ttl && nla_put_u8(skb, TCA_TUNNEL_KEY_ENC_TTL, key->ttl))
+			goto nla_put_failure;
 	}
 
 	tcf_tm_dump(&tm, &t->tcf_tm);
-- 
2.5.5