Fixed IPX dependencies under kernel versions above 5.15

Now the code will check the machine's kernel version in order to use the files provided by the original kernel (under 5.15+) or by this repository.

core/rtw_br_ext.c

@@ -17,7 +17,12 @@
 #ifdef __KERNEL__
 	#include <linux/if_arp.h>
 	#include <net/ip.h>
+	#include <linux/version.h>
+#if LINUX_VERSION_CODE > KERNEL_VERSION(5, 15, 0)
+	#include "net/ipx.h"
+#else
 	#include <net/ipx.h>
+#endif
 	#include <linux/atalk.h>
 	#include <linux/udp.h>
 	#include <linux/if_pppox.h>

include/linux/ipx.h

@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+#ifndef _IPX_H_
+#define _IPX_H_
+#include <linux/libc-compat.h>	/* for compatibility with glibc netipx/ipx.h */
+#include <linux/types.h>
+#include <linux/sockios.h>
+#include <linux/socket.h>
+#define IPX_NODE_LEN	6
+#define IPX_MTU		576
+#if __UAPI_DEF_SOCKADDR_IPX
+struct sockaddr_ipx {
+	__kernel_sa_family_t sipx_family;
+	__be16		sipx_port;
+	__be32		sipx_network;
+	unsigned char 	sipx_node[IPX_NODE_LEN];
+	__u8		sipx_type;
+	unsigned char	sipx_zero;	/* 16 byte fill */
+};
+#endif /* __UAPI_DEF_SOCKADDR_IPX */
+/*
+ * So we can fit the extra info for SIOCSIFADDR into the address nicely
+ */
+#define sipx_special	sipx_port
+#define sipx_action	sipx_zero
+#define IPX_DLTITF	0
+#define IPX_CRTITF	1
+#if __UAPI_DEF_IPX_ROUTE_DEFINITION
+struct ipx_route_definition {
+	__be32        ipx_network;
+	__be32        ipx_router_network;
+	unsigned char ipx_router_node[IPX_NODE_LEN];
+};
+#endif /* __UAPI_DEF_IPX_ROUTE_DEFINITION */
+#if __UAPI_DEF_IPX_INTERFACE_DEFINITION
+struct ipx_interface_definition {
+	__be32        ipx_network;
+	unsigned char ipx_device[16];
+	unsigned char ipx_dlink_type;
+#define IPX_FRAME_NONE		0
+#define IPX_FRAME_SNAP		1
+#define IPX_FRAME_8022		2
+#define IPX_FRAME_ETHERII	3
+#define IPX_FRAME_8023		4
+#define IPX_FRAME_TR_8022       5 /* obsolete */
+	unsigned char ipx_special;
+#define IPX_SPECIAL_NONE	0
+#define IPX_PRIMARY		1
+#define IPX_INTERNAL		2
+	unsigned char ipx_node[IPX_NODE_LEN];
+};
+#endif /* __UAPI_DEF_IPX_INTERFACE_DEFINITION */
+#if __UAPI_DEF_IPX_CONFIG_DATA
+struct ipx_config_data {
+	unsigned char	ipxcfg_auto_select_primary;
+	unsigned char	ipxcfg_auto_create_interfaces;
+};
+#endif /* __UAPI_DEF_IPX_CONFIG_DATA */
+/*
+ * OLD Route Definition for backward compatibility.
+ */
+#if __UAPI_DEF_IPX_ROUTE_DEF
+struct ipx_route_def {
+	__be32		ipx_network;
+	__be32		ipx_router_network;
+#define IPX_ROUTE_NO_ROUTER	0
+	unsigned char	ipx_router_node[IPX_NODE_LEN];
+	unsigned char	ipx_device[16];
+	unsigned short	ipx_flags;
+#define IPX_RT_SNAP		8
+#define IPX_RT_8022		4
+#define IPX_RT_BLUEBOOK		2
+#define IPX_RT_ROUTED		1
+};
+#endif /* __UAPI_DEF_IPX_ROUTE_DEF */
+#define SIOCAIPXITFCRT		(SIOCPROTOPRIVATE)
+#define SIOCAIPXPRISLT		(SIOCPROTOPRIVATE + 1)
+#define SIOCIPXCFGDATA		(SIOCPROTOPRIVATE + 2)
+#define SIOCIPXNCPCONN		(SIOCPROTOPRIVATE + 3)
+#endif /* _IPX_H_ */

include/net/ipx.h

@@ -0,0 +1,175 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _NET_INET_IPX_H_
+#define _NET_INET_IPX_H_
+/*
+ *	The following information is in its entirety obtained from:
+ *
+ *	Novell 'IPX Router Specification' Version 1.10 
+ *		Part No. 107-000029-001
+ *
+ *	Which is available from ftp.novell.com
+ */
+
+#include <linux/netdevice.h>
+#include <net/datalink.h>
+#if LINUX_VERSION_CODE > KERNEL_VERSION(5, 15, 0)
+	#include "linux/ipx.h"
+#else
+	#include <linux/ipx.h>
+#endif
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/refcount.h>
+
+struct ipx_address {
+	__be32  net;
+	__u8    node[IPX_NODE_LEN]; 
+	__be16  sock;
+};
+
+#define ipx_broadcast_node	"\377\377\377\377\377\377"
+#define ipx_this_node           "\0\0\0\0\0\0"
+
+#define IPX_MAX_PPROP_HOPS 8
+
+struct ipxhdr {
+	__be16			ipx_checksum __packed;
+#define IPX_NO_CHECKSUM	cpu_to_be16(0xFFFF)
+	__be16			ipx_pktsize __packed;
+	__u8			ipx_tctrl;
+	__u8			ipx_type;
+#define IPX_TYPE_UNKNOWN	0x00
+#define IPX_TYPE_RIP		0x01	/* may also be 0 */
+#define IPX_TYPE_SAP		0x04	/* may also be 0 */
+#define IPX_TYPE_SPX		0x05	/* SPX protocol */
+#define IPX_TYPE_NCP		0x11	/* $lots for docs on this (SPIT) */
+#define IPX_TYPE_PPROP		0x14	/* complicated flood fill brdcast */
+	struct ipx_address	ipx_dest __packed;
+	struct ipx_address	ipx_source __packed;
+};
+
+/* From af_ipx.c */
+extern int sysctl_ipx_pprop_broadcasting;
+
+struct ipx_interface {
+	/* IPX address */
+	__be32			if_netnum;
+	unsigned char		if_node[IPX_NODE_LEN];
+	refcount_t		refcnt;
+
+	/* physical device info */
+	struct net_device	*if_dev;
+	struct datalink_proto	*if_dlink;
+	__be16			if_dlink_type;
+
+	/* socket support */
+	unsigned short		if_sknum;
+	struct hlist_head	if_sklist;
+	spinlock_t		if_sklist_lock;
+
+	/* administrative overhead */
+	int			if_ipx_offset;
+	unsigned char		if_internal;
+	unsigned char		if_primary;
+
+	struct list_head	node; /* node in ipx_interfaces list */
+};
+
+struct ipx_route {
+	__be32			ir_net;
+	struct ipx_interface	*ir_intrfc;
+	unsigned char		ir_routed;
+	unsigned char		ir_router_node[IPX_NODE_LEN];
+	struct list_head	node; /* node in ipx_routes list */
+	refcount_t		refcnt;
+};
+
+struct ipx_cb {
+	u8	ipx_tctrl;
+	__be32	ipx_dest_net;
+	__be32	ipx_source_net;
+	struct {
+		__be32 netnum;
+		int index;
+	} last_hop;
+};
+
+#include <net/sock.h>
+
+struct ipx_sock {
+	/* struct sock has to be the first member of ipx_sock */
+	struct sock		sk;
+	struct ipx_address	dest_addr;
+	struct ipx_interface	*intrfc;
+	__be16			port;
+#ifdef CONFIG_IPX_INTERN
+	unsigned char		node[IPX_NODE_LEN];
+#endif
+	unsigned short		type;
+	/*
+	 * To handle special ncp connection-handling sockets for mars_nwe,
+ 	 * the connection number must be stored in the socket.
+	 */
+	unsigned short		ipx_ncp_conn;
+};
+
+static inline struct ipx_sock *ipx_sk(struct sock *sk)
+{
+	return (struct ipx_sock *)sk;
+}
+
+#define IPX_SKB_CB(__skb) ((struct ipx_cb *)&((__skb)->cb[0]))
+
+#define IPX_MIN_EPHEMERAL_SOCKET	0x4000
+#define IPX_MAX_EPHEMERAL_SOCKET	0x7fff
+
+extern struct list_head ipx_routes;
+extern rwlock_t ipx_routes_lock;
+
+extern struct list_head ipx_interfaces;
+struct ipx_interface *ipx_interfaces_head(void);
+extern spinlock_t ipx_interfaces_lock;
+
+extern struct ipx_interface *ipx_primary_net;
+
+int ipx_proc_init(void);
+void ipx_proc_exit(void);
+
+const char *ipx_frame_name(__be16);
+const char *ipx_device_name(struct ipx_interface *intrfc);
+
+static __inline__ void ipxitf_hold(struct ipx_interface *intrfc)
+{
+	refcount_inc(&intrfc->refcnt);
+}
+
+void ipxitf_down(struct ipx_interface *intrfc);
+struct ipx_interface *ipxitf_find_using_net(__be32 net);
+int ipxitf_send(struct ipx_interface *intrfc, struct sk_buff *skb, char *node);
+__be16 ipx_cksum(struct ipxhdr *packet, int length);
+int ipxrtr_add_route(__be32 network, struct ipx_interface *intrfc,
+		     unsigned char *node);
+void ipxrtr_del_routes(struct ipx_interface *intrfc);
+int ipxrtr_route_packet(struct sock *sk, struct sockaddr_ipx *usipx,
+			struct msghdr *msg, size_t len, int noblock);
+int ipxrtr_route_skb(struct sk_buff *skb);
+struct ipx_route *ipxrtr_lookup(__be32 net);
+int ipxrtr_ioctl(unsigned int cmd, void __user *arg);
+
+static __inline__ void ipxitf_put(struct ipx_interface *intrfc)
+{
+	if (refcount_dec_and_test(&intrfc->refcnt))
+		ipxitf_down(intrfc);
+}
+
+static __inline__ void ipxrtr_hold(struct ipx_route *rt)
+{
+	        refcount_inc(&rt->refcnt);
+}
+
+static __inline__ void ipxrtr_put(struct ipx_route *rt)
+{
+	        if (refcount_dec_and_test(&rt->refcnt))
+			                kfree(rt);
+}
+#endif /* _NET_INET_IPX_H_ */