From d677cc13ce9b23fdfacd812483d940fd3393b51c Mon Sep 17 00:00:00 2001
From: David Carlier <devnexen@gmail.com>
Date: Mon, 6 Jun 2022 07:18:53 +0100
Subject: [PATCH] Add `SO_BPF_EXTENSIONS` flag to socket.

Returns the supported bpf extensions from the kernel. Linux only.
Closes GH-8713.
---
 NEWS                                         |  1 +
 UPGRADING                                    |  1 +
 configure.ac                                 |  1 +
 ext/sockets/sockets.c                        | 63 ++++++++++++++++++++
 ext/sockets/tests/socket_bpf_extensions.phpt | 23 +++++++
 5 files changed, 89 insertions(+)
 create mode 100644 ext/sockets/tests/socket_bpf_extensions.phpt

diff --git a/NEWS b/NEWS
index 01b477d8426..bfe40295083 100644
--- a/NEWS
+++ b/NEWS
@@ -74,6 +74,7 @@ PHP                                                                        NEWS
     options. (David Carlier)
   . Added ancillary data support for FreeBSD. (David Carlier)
   . Added ancillary data support for NetBSD. (David Carlier)
+  . Added SO_BPF_EXTENSIONS socket option. (David Carlier)
 
 - Sodium:
   . Added sodium_crypto_stream_xchacha20_xor_ic(). (Scott)
diff --git a/UPGRADING b/UPGRADING
index 512a78f9f7e..a690ffd3c79 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -249,6 +249,7 @@ PHP 8.2 UPGRADE NOTES
   . LOCAL_CREDS_PERSISTENT (FreeBSD)
   . SCM_CREDS2 (FreeBSD)
   . LOCAL_CREDS (NetBSD)
+  . SO_BPF_EXTENSIONS
 
 ========================================
 11. Changes to INI File Handling
diff --git a/configure.ac b/configure.ac
index bed4b063bcc..73c7edeae3d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -395,6 +395,7 @@ fcntl.h \
 grp.h \
 ieeefp.h \
 langinfo.h \
+linux/filter.h \
 linux/sock_diag.h \
 malloc.h \
 poll.h \
diff --git a/ext/sockets/sockets.c b/ext/sockets/sockets.c
index 67c2038324a..07d44b4d2db 100644
--- a/ext/sockets/sockets.c
+++ b/ext/sockets/sockets.c
@@ -60,6 +60,11 @@
 # else
 #  undef SO_MEMINFO
 # endif
+# if defined(HAVE_LINUX_FILTER_H)
+#  include <linux/filter.h>
+# else
+#  undef SO_BPF_EXTENSIONS
+# endif
 #endif
 
 #include <stddef.h>
@@ -561,6 +566,64 @@ static PHP_MINIT_FUNCTION(sockets)
 #ifdef SO_MEMINFO
 	REGISTER_LONG_CONSTANT("SO_MEMINFO", SO_MEMINFO,        CONST_CS | CONST_PERSISTENT);
 #endif
+#ifdef SO_BPF_EXTENSIONS
+	REGISTER_LONG_CONSTANT("SO_BPF_EXTENSIONS", SO_BPF_EXTENSIONS, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_OFF
+	REGISTER_LONG_CONSTANT("SKF_AD_OFF", SKF_AD_OFF, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_PROTOCOL
+	REGISTER_LONG_CONSTANT("SKF_AD_PROTOCOL", SKF_AD_PROTOCOL, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_PKTTYPE
+	REGISTER_LONG_CONSTANT("SKF_AD_PKTTYPE", SKF_AD_PKTTYPE, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_IFINDEX
+	REGISTER_LONG_CONSTANT("SKF_AD_IFINDEX", SKF_AD_IFINDEX, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_NLATTR
+	REGISTER_LONG_CONSTANT("SKF_AD_NLATTR", SKF_AD_NLATTR, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_NLATTR_NEST
+	REGISTER_LONG_CONSTANT("SKF_AD_NLATTR_NEST", SKF_AD_NLATTR_NEST, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_MARK
+	REGISTER_LONG_CONSTANT("SKF_AD_MARK", SKF_AD_MARK, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_QUEUE
+	REGISTER_LONG_CONSTANT("SKF_AD_QUEUE", SKF_AD_QUEUE, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_HATYPE
+	REGISTER_LONG_CONSTANT("SKF_AD_HATYPE", SKF_AD_HATYPE, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_RXHASH
+	REGISTER_LONG_CONSTANT("SKF_AD_RXHASH", SKF_AD_RXHASH, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_CPU
+	REGISTER_LONG_CONSTANT("SKF_AD_CPU", SKF_AD_CPU, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_ALU_XOR_X
+	REGISTER_LONG_CONSTANT("SKF_AD_ALU_XOR_X", SKF_AD_ALU_XOR_X, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_VLAN_TAG
+	REGISTER_LONG_CONSTANT("SKF_AD_VLAN_TAG", SKF_AD_VLAN_TAG, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_VLAN_TAG_PRESENT
+	REGISTER_LONG_CONSTANT("SKF_AD_VLAN_TAG_PRESENT", SKF_AD_VLAN_TAG_PRESENT, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_PAY_OFFSET
+	REGISTER_LONG_CONSTANT("SKF_AD_PAY_OFFSET", SKF_AD_PAY_OFFSET, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_RANDOM
+	REGISTER_LONG_CONSTANT("SKF_AD_RANDOM", SKF_AD_RANDOM, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_VLAN_TPID
+	REGISTER_LONG_CONSTANT("SKF_AD_VLAN_TPID", SKF_AD_VLAN_TPID, CONST_CS | CONST_PERSISTENT);
+#endif
+#ifdef SKF_AD_MAX
+	REGISTER_LONG_CONSTANT("SKF_AD_MAX", SKF_AD_MAX, CONST_CS | CONST_PERSISTENT);
+#endif
+
 #ifdef TCP_NODELAY
 	REGISTER_LONG_CONSTANT("TCP_NODELAY",   TCP_NODELAY,    CONST_CS | CONST_PERSISTENT);
 #endif
diff --git a/ext/sockets/tests/socket_bpf_extensions.phpt b/ext/sockets/tests/socket_bpf_extensions.phpt
new file mode 100644
index 00000000000..a9f97dfd181
--- /dev/null
+++ b/ext/sockets/tests/socket_bpf_extensions.phpt
@@ -0,0 +1,23 @@
+--TEST--
+SO_BPF_EXTENSIONS socket_getopt test
+--EXTENSIONS--
+sockets
+--SKIPIF--
+<?php
+if (!defined("SO_BPF_EXTENSIONS")) {
+    die("skip SO_BOF_EXTENSIONS");
+}
+?>
+--FILE--
+<?php
+$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
+if (!$socket) {
+    die('Unable to create AF_INET socket [socket]');
+}
+$flags = socket_getopt( $socket, SOL_SOCKET, SO_BPF_EXTENSIONS);
+if ($flags == false) die("socket_getopt");
+echo "extensions supported flag $flags";
+socket_close($socket);
+?>
+--EXPECTF--
+extensions supported flag %d