From: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= <bjorn.topel@intel.com>
Date: Wed, 2 May 2018 13:01:22 +0200
Subject: net: initial AF_XDP skeleton
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Patch-mainline: v4.18-rc1
Git-commit: 68e8b849b221b37a78a110a0307717d45e3593a0
References: bsc#1109837

Buildable skeleton of AF_XDP without any functionality. Just what it
takes to register a new address family.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 MAINTAINERS                         |    8 ++++++++
 include/linux/socket.h              |    5 ++++-
 net/Kconfig                         |    1 +
 net/core/sock.c                     |   12 ++++++++----
 net/xdp/Kconfig                     |    7 +++++++
 security/selinux/hooks.c            |    4 +++-
 security/selinux/include/classmap.h |    4 +++-
 7 files changed, 34 insertions(+), 7 deletions(-)
 create mode 100644 net/xdp/Kconfig

--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14097,6 +14097,14 @@ S:	Supported
 F:	arch/x86/pci/*xen*
 F:	drivers/pci/*xen*
 
+XDP SOCKETS (AF_XDP)
+M:	Björn Töpel <bjorn.topel@intel.com>
+M:	Magnus Karlsson <magnus.karlsson@intel.com>
+L:	netdev@vger.kernel.org
+S:	Maintained
+F:	kernel/bpf/xskmap.c
+F:	net/xdp/
+
 XEN BLOCK SUBSYSTEM
 M:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
 M:	Roger Pau Monné <roger.pau@citrix.com>
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -206,8 +206,9 @@ struct ucred {
 				 * PF_SMC protocol family that
 				 * reuses AF_INET address family
 				 */
+#define AF_XDP		44	/* XDP sockets			*/
 
-#define AF_MAX		44	/* For now.. */
+#define AF_MAX		45	/* For now.. */
 
 /* Protocol families, same as address families. */
 #define PF_UNSPEC	AF_UNSPEC
@@ -256,6 +257,7 @@ struct ucred {
 #define PF_KCM		AF_KCM
 #define PF_QIPCRTR	AF_QIPCRTR
 #define PF_SMC		AF_SMC
+#define PF_XDP		AF_XDP
 #define PF_MAX		AF_MAX
 
 /* Maximum queue length specifiable by listen.  */
@@ -335,6 +337,7 @@ struct ucred {
 #define SOL_NFC		280
 #define SOL_KCM		281
 #define SOL_TLS		282
+#define SOL_XDP		283
 
 /* IPX options */
 #define IPX_TYPE	1
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -59,6 +59,7 @@ source "net/tls/Kconfig"
 source "net/xfrm/Kconfig"
 source "net/iucv/Kconfig"
 source "net/smc/Kconfig"
+source "net/xdp/Kconfig"
 
 config INET
 	bool "TCP/IP networking"
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -224,7 +224,8 @@ static struct lock_class_key af_family_k
   x "AF_RXRPC" ,	x "AF_ISDN"     ,	x "AF_PHONET"   , \
   x "AF_IEEE802154",	x "AF_CAIF"	,	x "AF_ALG"      , \
   x "AF_NFC"   ,	x "AF_VSOCK"    ,	x "AF_KCM"      , \
-  x "AF_QIPCRTR",	x "AF_SMC"	,	x "AF_MAX"
+  x "AF_QIPCRTR",	x "AF_SMC"	,	x "AF_XDP"	, \
+  x "AF_MAX"
 
 static const char *const af_family_key_strings[AF_MAX+1] = {
 	_sock_locks("sk_lock-")
@@ -260,7 +261,8 @@ static const char *const af_family_rlock
   "rlock-AF_RXRPC" , "rlock-AF_ISDN"     , "rlock-AF_PHONET"   ,
   "rlock-AF_IEEE802154", "rlock-AF_CAIF" , "rlock-AF_ALG"      ,
   "rlock-AF_NFC"   , "rlock-AF_VSOCK"    , "rlock-AF_KCM"      ,
-  "rlock-AF_QIPCRTR", "rlock-AF_SMC"     , "rlock-AF_MAX"
+  "rlock-AF_QIPCRTR", "rlock-AF_SMC"     , "rlock-AF_XDP"      ,
+  "rlock-AF_MAX"
 };
 static const char *const af_family_wlock_key_strings[AF_MAX+1] = {
   "wlock-AF_UNSPEC", "wlock-AF_UNIX"     , "wlock-AF_INET"     ,
@@ -277,7 +279,8 @@ static const char *const af_family_wlock
   "wlock-AF_RXRPC" , "wlock-AF_ISDN"     , "wlock-AF_PHONET"   ,
   "wlock-AF_IEEE802154", "wlock-AF_CAIF" , "wlock-AF_ALG"      ,
   "wlock-AF_NFC"   , "wlock-AF_VSOCK"    , "wlock-AF_KCM"      ,
-  "wlock-AF_QIPCRTR", "wlock-AF_SMC"     , "wlock-AF_MAX"
+  "wlock-AF_QIPCRTR", "wlock-AF_SMC"     , "wlock-AF_XDP"      ,
+  "wlock-AF_MAX"
 };
 static const char *const af_family_elock_key_strings[AF_MAX+1] = {
   "elock-AF_UNSPEC", "elock-AF_UNIX"     , "elock-AF_INET"     ,
@@ -294,7 +297,8 @@ static const char *const af_family_elock
   "elock-AF_RXRPC" , "elock-AF_ISDN"     , "elock-AF_PHONET"   ,
   "elock-AF_IEEE802154", "elock-AF_CAIF" , "elock-AF_ALG"      ,
   "elock-AF_NFC"   , "elock-AF_VSOCK"    , "elock-AF_KCM"      ,
-  "elock-AF_QIPCRTR", "elock-AF_SMC"     , "elock-AF_MAX"
+  "elock-AF_QIPCRTR", "elock-AF_SMC"     , "elock-AF_XDP"      ,
+  "elock-AF_MAX"
 };
 
 /*
--- /dev/null
+++ b/net/xdp/Kconfig
@@ -0,0 +1,7 @@
+config XDP_SOCKETS
+	bool "XDP sockets"
+	depends on BPF_SYSCALL
+	default n
+	help
+	  XDP sockets allows a channel between XDP programs and
+	  userspace applications.
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1412,7 +1412,9 @@ static inline u16 socket_type_to_securit
 			return SECCLASS_QIPCRTR_SOCKET;
 		case PF_SMC:
 			return SECCLASS_SMC_SOCKET;
-#if PF_MAX > 44
+		case PF_XDP:
+			return SECCLASS_XDP_SOCKET;
+#if PF_MAX > 45
 #error New address family defined, please update this function.
 #endif
 		}
--- a/security/selinux/include/classmap.h
+++ b/security/selinux/include/classmap.h
@@ -231,9 +231,11 @@ struct security_class_mapping secclass_m
 	  { COMMON_SOCK_PERMS, NULL } },
 	{ "smc_socket",
 	  { COMMON_SOCK_PERMS, NULL } },
+	{ "xdp_socket",
+	  { COMMON_SOCK_PERMS, NULL } },
 	{ NULL }
   };
 
-#if PF_MAX > 44
+#if PF_MAX > 45
 #error New address family defined, please update secclass_map.
 #endif