net - IP_NODEFRAG option for IPv4 socket

this patch is implementing IP_NODEFRAG option for IPv4 socket.
The reason is, there's no other way to send out the packet with user
customized header of the reassembly part.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 1 deletions

diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 47fff528ff39..6c40a8c46e79 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -465,7 +465,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
                              (1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
                              (1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
                              (1<<IP_PASSSEC) | (1<<IP_TRANSPARENT) |
-                             (1<<IP_MINTTL))) ||
+                             (1<<IP_MINTTL) | (1<<IP_NODEFRAG))) ||
             optname == IP_MULTICAST_TTL ||
             optname == IP_MULTICAST_ALL ||
             optname == IP_MULTICAST_LOOP ||
@@ -588,6 +588,13 @@ static int do_ip_setsockopt(struct sock *sk, int level,
                 }
                 inet->hdrincl = val ? 1 : 0;
                 break;
+        case IP_NODEFRAG:
+                if (sk->sk_type != SOCK_RAW) {
+                        err = -ENOPROTOOPT;
+                        break;
+                }
+                inet->nodefrag = val ? 1 : 0;
+                break;
         case IP_MTU_DISCOVER:
                 if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_PROBE)
                         goto e_inval;