[NET]: Introduce SO_{SND,RCV}BUFFORCE socket options

Allows overriding of sysctl_{wmem,rmrm}_max

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 2 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
index 12f6d9a2a522..51a5e7ddee85 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -260,7 +260,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
                            
                         if (val > sysctl_wmem_max)
                                 val = sysctl_wmem_max;
-
+set_sndbuf:
                         sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
                         if ((val * 2) < SOCK_MIN_SNDBUF)
                                 sk->sk_sndbuf = SOCK_MIN_SNDBUF;
@@ -274,6 +274,13 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
                         sk->sk_write_space(sk);
                         break;
 
+                case SO_SNDBUFFORCE:
+                        if (!capable(CAP_NET_ADMIN)) {
+                                ret = -EPERM;
+                                break;
+                        }
+                        goto set_sndbuf;
+
                 case SO_RCVBUF:
                         /* Don't error on this BSD doesn't and if you think
                            about it this is right. Otherwise apps have to
@@ -282,7 +289,7 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
                           
                         if (val > sysctl_rmem_max)
                                 val = sysctl_rmem_max;
-
+set_rcvbuf:
                         sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
                         /* FIXME: is this lower bound the right one? */
                         if ((val * 2) < SOCK_MIN_RCVBUF)
@@ -291,6 +298,13 @@ int sock_setsockopt(struct socket *sock, int level, int optname,
                                 sk->sk_rcvbuf = val * 2;
                         break;
 
+                case SO_RCVBUFFORCE:
+                        if (!capable(CAP_NET_ADMIN)) {
+                                ret = -EPERM;
+                                break;
+                        }
+                        goto set_rcvbuf;
+
                 case SO_KEEPALIVE:
 #ifdef CONFIG_INET
                         if (sk->sk_protocol == IPPROTO_TCP)