netdev - [PATCH iproute2-next] iproute_lwtunnel: allow specifying 'src' for 'encap ip' / 'encap ip6'

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Date:   Fri, 17 Aug 2018 10:31:34 +0300
From:   Shmulik Ladkani <shmulik@...anetworks.com>
To:     stephen@...workplumber.org, dsahern@...il.com
Cc:     netdev@...r.kernel.org, shmulik.ladkani@...anetworks.com,
        Shmulik Ladkani <shmulik.ladkani@...il.com>
Subject: [PATCH iproute2-next] iproute_lwtunnel: allow specifying 'src' for 'encap ip' / 'encap ip6'

This allows the user to specify the LWTUNNEL_IP_SRC/LWTUNNEL_IP6_SRC
when setting an lwtunnel encapsulation route.

Signed-off-by: Shmulik Ladkani <shmulik.ladkani@...il.com>
---
 ip/iproute_lwtunnel.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/ip/iproute_lwtunnel.c b/ip/iproute_lwtunnel.c
index 740da7c6..20d5545c 100644
--- a/ip/iproute_lwtunnel.c
+++ b/ip/iproute_lwtunnel.c
@@ -671,7 +671,7 @@ static int parse_encap_mpls(struct rtattr *rta, size_t len,
 static int parse_encap_ip(struct rtattr *rta, size_t len,
 			  int *argcp, char ***argvp)
 {
-	int id_ok = 0, dst_ok = 0, tos_ok = 0, ttl_ok = 0;
+	int id_ok = 0, dst_ok = 0, src_ok = 0, tos_ok = 0, ttl_ok = 0;
 	char **argv = *argvp;
 	int argc = *argcp;
 
@@ -694,6 +694,15 @@ static int parse_encap_ip(struct rtattr *rta, size_t len,
 			get_addr(&addr, *argv, AF_INET);
 			rta_addattr_l(rta, len, LWTUNNEL_IP_DST,
 				      &addr.data, addr.bytelen);
+		} else if (strcmp(*argv, "src") == 0) {
+			inet_prefix addr;
+
+			NEXT_ARG();
+			if (src_ok++)
+				duparg2("src", *argv);
+			get_addr(&addr, *argv, AF_INET);
+			rta_addattr_l(rta, len, LWTUNNEL_IP_SRC,
+				      &addr.data, addr.bytelen);
 		} else if (strcmp(*argv, "tos") == 0) {
 			__u32 tos;
 
@@ -805,7 +814,7 @@ static int parse_encap_ila(struct rtattr *rta, size_t len,
 static int parse_encap_ip6(struct rtattr *rta, size_t len,
 			   int *argcp, char ***argvp)
 {
-	int id_ok = 0, dst_ok = 0, tos_ok = 0, ttl_ok = 0;
+	int id_ok = 0, dst_ok = 0, src_ok = 0, tos_ok = 0, ttl_ok = 0;
 	char **argv = *argvp;
 	int argc = *argcp;
 
@@ -828,6 +837,15 @@ static int parse_encap_ip6(struct rtattr *rta, size_t len,
 			get_addr(&addr, *argv, AF_INET6);
 			rta_addattr_l(rta, len, LWTUNNEL_IP6_DST,
 				      &addr.data, addr.bytelen);
+		} else if (strcmp(*argv, "src") == 0) {
+			inet_prefix addr;
+
+			NEXT_ARG();
+			if (src_ok++)
+				duparg2("src", *argv);
+			get_addr(&addr, *argv, AF_INET6);
+			rta_addattr_l(rta, len, LWTUNNEL_IP6_SRC,
+				      &addr.data, addr.bytelen);
 		} else if (strcmp(*argv, "tc") == 0) {
 			__u32 tc;
 
-- 
2.18.0