linux-kernel - [PATCH] ipv6: decrease hop limit counter in ip6

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Date:   Fri, 23 Jul 2021 02:44:43 +0900
From:   Kangmin Park <l4stpr0gr4m@...il.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ipv6: decrease hop limit counter in ip6_forward()

Decrease hop limit counter when deliver skb to ndp proxy.

Signed-off-by: Kangmin Park <l4stpr0gr4m@...il.com>
---
 net/ipv6/ip6_output.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 01bea76e3891..aaaf9622cf2d 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -549,9 +549,10 @@ int ip6_forward(struct sk_buff *skb)
 	if (net->ipv6.devconf_all->proxy_ndp &&
 	    pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) {
 		int proxied = ip6_forward_proxy_check(skb);
-		if (proxied > 0)
+		if (proxied > 0) {
+			hdr->hop_limit--;
 			return ip6_input(skb);
-		else if (proxied < 0) {
+		} else if (proxied < 0) {
 			__IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
 			goto drop;
 		}
-- 
2.26.2