[SRU][F/B][PATCH 1/1] gtp: add GTPA_LINK info to msg sent to userspace

[William Breathitt Gray]

From: Nicolas Dichtel <nicolas.dichtel at 6wind.com>

BugLink: https://bugs.launchpad.net/bugs/1894605

During a dump, this attribute is essential, it enables the userspace to
know on which interface the context is linked to.

Fixes: 459aa660eb1d ("gtp: add initial driver for datapath of GPRS Tunneling Protocol (GTP-U)")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel at 6wind.com>
Tested-by: Gabriel Ganne <gabriel.ganne at 6wind.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit b274e47d9e3f4dcd4ad4028a316ec22dc4533ac7)
Signed-off-by: William Breathitt Gray <william.gray at canonical.com>
---
 drivers/net/gtp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/gtp.c b/drivers/net/gtp.c
index d89ec99abcd6..634bdea38ecb 100644
--- a/drivers/net/gtp.c
+++ b/drivers/net/gtp.c
@@ -1182,6 +1182,7 @@ static int gtp_genl_fill_info(struct sk_buff *skb, u32 snd_portid, u32 snd_seq,
 		goto nlmsg_failure;
 
 	if (nla_put_u32(skb, GTPA_VERSION, pctx->gtp_version) ||
+	    nla_put_u32(skb, GTPA_LINK, pctx->dev->ifindex) ||
 	    nla_put_be32(skb, GTPA_PEER_ADDRESS, pctx->peer_addr_ip4.s_addr) ||
 	    nla_put_be32(skb, GTPA_MS_ADDRESS, pctx->ms_addr_ip4.s_addr))
 		goto nla_put_failure;
-- 
2.25.1