[PATCH] net: Use helper macro IP_MAX_MTU in __ip_append_data()

From: Miaohe Lin
Date: Sat Aug 29 2020 - 05:10:41 EST


What 0xFFFF means here is actually the max mtu of a ip packet. Use help
macro IP_MAX_MTU here.

Signed-off-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
---
net/ipv4/ip_output.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 329a0ab87542..f0f234727547 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -996,7 +996,7 @@ static int __ip_append_data(struct sock *sk,

fragheaderlen = sizeof(struct iphdr) + (opt ? opt->optlen : 0);
maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen;
- maxnonfragsize = ip_sk_ignore_df(sk) ? 0xFFFF : mtu;
+ maxnonfragsize = ip_sk_ignore_df(sk) ? IP_MAX_MTU : mtu;

if (cork->length + length > maxnonfragsize - fragheaderlen) {
ip_local_error(sk, EMSGSIZE, fl4->daddr, inet->inet_dport,
--
2.19.1