netdev - [PATCH iproute2/next 1/2] tc/act_tunnel_key: Enable setup of tos and ttl

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Date:   Thu, 19 Jul 2018 14:02:14 +0300
From:   Or Gerlitz <ogerlitz@...lanox.com>
To:     David Ahern <dsahern@...il.com>
Cc:     netdev@...r.kernel.org, Or Gerlitz <ogerlitz@...lanox.com>
Subject: [PATCH iproute2/next 1/2] tc/act_tunnel_key: Enable setup of tos and ttl

Allow to set tos and ttl for the tunnel.

For example, here's encap rule that sets tos to the tunnel:

tc filter add dev eth0_0 protocol ip parent ffff: prio 10 flower \
   src_mac e4:11:22:33:44:50 dst_mac e4:11:22:33:44:70 \
   action tunnel_key set src_ip 192.168.10.1 dst_ip 192.168.10.2 id 100 dst_port 4789 tos 0x30 \
   action mirred egress redirect dev vxlan_sys_4789

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 +
 man/man8/tc-tunnel_key.8                  |    8 ++++
 tc/m_tunnel_key.c                         |   53 +++++++++++++++++++++++++++++
 3 files changed, 63 insertions(+), 0 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..be384d6 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/man/man8/tc-tunnel_key.8 b/man/man8/tc-tunnel_key.8
index 7d4b30e..1e09362 100644
--- a/man/man8/tc-tunnel_key.8
+++ b/man/man8/tc-tunnel_key.8
@@ -16,6 +16,8 @@ tunnel_key - Tunnel metadata manipulation
 .IR ADDRESS
 .BI id " KEY_ID"
 .BI dst_port " UDP_PORT"
+.BI tos " TOS"
+.BI ttl " TTL"
 .RB "[ " csum " | " nocsum " ]"
 
 .SH DESCRIPTION
@@ -89,6 +91,12 @@ is specified in the form CLASS:TYPE:DATA, where CLASS is represented as a
 variable length hexadecimal value. Additionally multiple options may be
 listed using a comma delimiter.
 .TP
+.B tos
+Outer header TOS
+.TP
+.B ttl
+Outer header TTL
+.TP
 .RB [ no ] csum
 Controlls outer UDP checksum. When set to
 .B csum
diff --git a/tc/m_tunnel_key.c b/tc/m_tunnel_key.c
index 5a0e3fc..e9e71e4 100644
--- a/tc/m_tunnel_key.c
+++ b/tc/m_tunnel_key.c
@@ -190,6 +190,22 @@ static int tunnel_key_parse_geneve_opts(char *str, struct nlmsghdr *n)
 	return 0;
 }
 
+static int tunnel_key_parse_tos_ttl(char *str, int type, struct nlmsghdr *n)
+{
+	int ret;
+	__u8 val;
+
+	ret = get_u8(&val, str, 10);
+	if (ret)
+		ret = get_u8(&val, str, 16);
+	if (ret)
+		return -1;
+
+	addattr8(n, MAX_MSG, type, val);
+
+	return 0;
+}
+
 static int parse_tunnel_key(struct action_util *a, int *argc_p, char ***argv_p,
 			    int tca_id, struct nlmsghdr *n)
 {
@@ -273,6 +289,22 @@ static int parse_tunnel_key(struct action_util *a, int *argc_p, char ***argv_p,
 				fprintf(stderr, "Illegal \"geneve_opts\"\n");
 				return -1;
 			}
+		} else if (matches(*argv, "tos") == 0) {
+			NEXT_ARG();
+			ret = tunnel_key_parse_tos_ttl(*argv,
+							TCA_TUNNEL_KEY_ENC_TOS, n);
+			if (ret < 0) {
+				fprintf(stderr, "Illegal \"tos\"\n");
+				return -1;
+			}
+		} else if (matches(*argv, "ttl") == 0) {
+			NEXT_ARG();
+			ret = tunnel_key_parse_tos_ttl(*argv,
+							TCA_TUNNEL_KEY_ENC_TTL, n);
+			if (ret < 0) {
+				fprintf(stderr, "Illegal \"ttl\"\n");
+				return -1;
+			}
 		} else if (matches(*argv, "csum") == 0) {
 			csum = 1;
 		} else if (matches(*argv, "nocsum") == 0) {
@@ -435,6 +467,23 @@ static void tunnel_key_print_key_opt(const char *name, struct rtattr *attr)
 					tb[TCA_TUNNEL_KEY_ENC_OPTS_GENEVE]);
 }
 
+static void tunnel_key_print_tos_ttl(FILE *f, char *name,
+				     struct rtattr *attr)
+{
+	if (!attr)
+		return;
+
+	if (matches(name, "tos") == 0 && rta_getattr_u8(attr) != 0) {
+		print_string(PRINT_FP, NULL, "%s", _SL_);
+		print_uint(PRINT_ANY, "tos", "\ttos 0x%x",
+			   rta_getattr_u8(attr));
+	} else if (matches(name, "ttl") == 0 && rta_getattr_u8(attr) != 0) {
+		print_string(PRINT_FP, NULL, "%s", _SL_);
+		print_uint(PRINT_ANY, "ttl", "\tttl %u",
+			   rta_getattr_u8(attr));
+	}
+}
+
 static int print_tunnel_key(struct action_util *au, FILE *f, struct rtattr *arg)
 {
 	struct rtattr *tb[TCA_TUNNEL_KEY_MAX + 1];
@@ -476,6 +525,10 @@ static int print_tunnel_key(struct action_util *au, FILE *f, struct rtattr *arg)
 					 tb[TCA_TUNNEL_KEY_ENC_OPTS]);
 		tunnel_key_print_flag(f, "nocsum", "csum",
 				      tb[TCA_TUNNEL_KEY_NO_CSUM]);
+		tunnel_key_print_tos_ttl(f, "tos",
+					  tb[TCA_TUNNEL_KEY_ENC_TOS]);
+		tunnel_key_print_tos_ttl(f, "ttl",
+					  tb[TCA_TUNNEL_KEY_ENC_TTL]);
 		break;
 	}
 	print_action_control(f, " ", parm->action, "");
-- 
1.7.1