netpoll: provide an IP ident in UDP frames

Let's fill IP header ident field with a meaningful value,
it might help some setups.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/core/netpoll.c b/net/core/netpoll.c
index 346b1eb83a1f..5af9c2692506 100644
--- a/net/core/netpoll.c
+++ b/net/core/netpoll.c
@@ -388,6 +388,7 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
         struct udphdr *udph;
         struct iphdr *iph;
         struct ethhdr *eth;
+        static atomic_t ip_ident;
 
         udp_len = len + sizeof(*udph);
         ip_len = udp_len + sizeof(*iph);
@@ -423,7 +424,7 @@ void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
         put_unaligned(0x45, (unsigned char *)iph);
         iph->tos      = 0;
         put_unaligned(htons(ip_len), &(iph->tot_len));
-        iph->id       = 0;
+        iph->id       = htons(atomic_inc_return(&ip_ident));
         iph->frag_off = 0;
         iph->ttl      = 64;
         iph->protocol = IPPROTO_UDP;