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

Allows overriding of sysctl_{wmem,rmrm}_max

Signed-off-by: Patrick McHardy <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/asm-alpha/socket.h

···
 #define SO_ERROR	0x1007
 #define SO_SNDBUF	0x1001
 #define SO_RCVBUF	0x1002
+#define SO_SNDBUFFORCE	0x100a
+#define SO_RCVBUFFORCE	0x100b
 #define	SO_RCVLOWAT	0x1010
 #define	SO_SNDLOWAT	0x1011
 #define	SO_RCVTIMEO	0x1012

include/asm-arm/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-arm26/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-cris/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-frv/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-h8300/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-i386/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-ia64/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-m32r/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-m68k/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-mips/socket.h

···
 #define SO_ERROR	0x1007	/* get error status and clear */
 #define SO_SNDBUF	0x1001	/* Send buffer size. */
 #define SO_RCVBUF	0x1002	/* Receive buffer. */
+#define SO_SNDBUFFORCE	0x100a
+#define SO_RCVBUFFORCE	0x100b
 #define SO_SNDLOWAT	0x1003	/* send low-water mark */
 #define SO_RCVLOWAT	0x1004	/* receive low-water mark */
 #define SO_SNDTIMEO	0x1005	/* send timeout */

include/asm-parisc/socket.h

···
 /* To add :#define SO_REUSEPORT 0x0200 */
 #define SO_SNDBUF	0x1001
 #define SO_RCVBUF	0x1002
+#define SO_SNDBUFFORCE	0x100a
+#define SO_RCVBUFFORCE	0x100b
 #define SO_SNDLOWAT	0x1003
 #define SO_RCVLOWAT	0x1004
 #define SO_SNDTIMEO	0x1005

include/asm-ppc/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-ppc64/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-s390/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-sh/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_RCVBUFFORCE	32
+#define SO_SNDBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-sparc/socket.h

···
 
 #define SO_SNDBUF	0x1001
 #define SO_RCVBUF	0x1002
+#define SO_SNDBUFFORCE	0x100a
+#define SO_RCVBUFFORCE	0x100b
 #define SO_ERROR	0x1007
 #define SO_TYPE		0x1008
 

include/asm-sparc64/socket.h

···
 
 #define SO_SNDBUF	0x1001
 #define SO_RCVBUF	0x1002
+#define SO_SNDBUFFORCE	0x100a
+#define SO_RCVBUFFORCE	0x100b
 #define SO_ERROR	0x1007
 #define SO_TYPE		0x1008
 

include/asm-v850/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-x86_64/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

include/asm-xtensa/socket.h

···
 #define SO_BROADCAST	6
 #define SO_SNDBUF	7
 #define SO_RCVBUF	8
+#define SO_SNDBUFFORCE	32
+#define SO_RCVBUFFORCE	33
 #define SO_KEEPALIVE	9
 #define SO_OOBINLINE	10
 #define SO_NO_CHECK	11

net/core/sock.c

···
 			   
 			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;
···
 			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
···
 			  
 			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)
···
 			else
 				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