Remove DECnet support from kernel

DECnet is an obsolete network protocol that receives more attention
from kernel janitors than users. It belongs in computer protocol
history museum not in Linux kernel.

It has been "Orphaned" in kernel since 2010. The iproute2 support
for DECnet was dropped in 5.0 release. The documentation link on
Sourceforge says it is abandoned there as well.

Leave the UAPI alone to keep userspace programs compiling.
This means that there is still an empty neighbour table
for AF_DECNET.

The table of /proc/sys/net entries was updated to match
current directories and reformatted to be alphabetical.

Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Acked-by: David Ahern <dsahern@kernel.org>
Acked-by: Nikolay Aleksandrov <razor@blackwall.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 0 insertions, 169 deletions

diff --git a/include/net/dn_fib.h b/include/net/dn_fib.h
deleted file mode 100644
index 1929a3cd5ebe..000000000000
--- a/include/net/dn_fib.h
+++ /dev/null
@@ -1,169 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _NET_DN_FIB_H
-#define _NET_DN_FIB_H
-
-#include <linux/netlink.h>
-#include <linux/refcount.h>
-#include <linux/rtnetlink.h>
-#include <net/fib_rules.h>
-
-extern const struct nla_policy rtm_dn_policy[];
-
-struct dn_fib_res {
-	struct fib_rule *r;
-	struct dn_fib_info *fi;
-	unsigned char prefixlen;
-	unsigned char nh_sel;
-	unsigned char type;
-	unsigned char scope;
-};
-
-struct dn_fib_nh {
-	struct net_device	*nh_dev;
-	unsigned int		nh_flags;
-	unsigned char		nh_scope;
-	int			nh_weight;
-	int			nh_power;
-	int			nh_oif;
-	__le16			nh_gw;
-};
-
-struct dn_fib_info {
-	struct dn_fib_info	*fib_next;
-	struct dn_fib_info	*fib_prev;
-	refcount_t		fib_treeref;
-	refcount_t		fib_clntref;
-	int			fib_dead;
-	unsigned int		fib_flags;
-	int			fib_protocol;
-	__le16			fib_prefsrc;
-	__u32			fib_priority;
-	__u32			fib_metrics[RTAX_MAX];
-	int			fib_nhs;
-	int			fib_power;
-	struct dn_fib_nh	fib_nh[0];
-#define dn_fib_dev		fib_nh[0].nh_dev
-};
-
-
-#define DN_FIB_RES_RESET(res)	((res).nh_sel = 0)
-#define DN_FIB_RES_NH(res)	((res).fi->fib_nh[(res).nh_sel])
-
-#define DN_FIB_RES_PREFSRC(res)	((res).fi->fib_prefsrc ? : __dn_fib_res_prefsrc(&res))
-#define DN_FIB_RES_GW(res)	(DN_FIB_RES_NH(res).nh_gw)
-#define DN_FIB_RES_DEV(res)	(DN_FIB_RES_NH(res).nh_dev)
-#define DN_FIB_RES_OIF(res)	(DN_FIB_RES_NH(res).nh_oif)
-
-typedef struct {
-	__le16	datum;
-} dn_fib_key_t;
-
-typedef struct {
-	__le16	datum;
-} dn_fib_hash_t;
-
-typedef struct {
-	__u16	datum;
-} dn_fib_idx_t;
-
-struct dn_fib_node {
-	struct dn_fib_node *fn_next;
-	struct dn_fib_info *fn_info;
-#define DN_FIB_INFO(f) ((f)->fn_info)
-	dn_fib_key_t	fn_key;
-	u8		fn_type;
-	u8		fn_scope;
-	u8		fn_state;
-};
-
-
-struct dn_fib_table {
-	struct hlist_node hlist;
-	u32 n;
-
-	int (*insert)(struct dn_fib_table *t, struct rtmsg *r, 
-			struct nlattr *attrs[], struct nlmsghdr *n,
-			struct netlink_skb_parms *req);
-	int (*delete)(struct dn_fib_table *t, struct rtmsg *r,
-			struct nlattr *attrs[], struct nlmsghdr *n,
-			struct netlink_skb_parms *req);
-	int (*lookup)(struct dn_fib_table *t, const struct flowidn *fld,
-			struct dn_fib_res *res);
-	int (*flush)(struct dn_fib_table *t);
-	int (*dump)(struct dn_fib_table *t, struct sk_buff *skb, struct netlink_callback *cb);
-
-	unsigned char data[];
-};
-
-#ifdef CONFIG_DECNET_ROUTER
-/*
- * dn_fib.c
- */
-void dn_fib_init(void);
-void dn_fib_cleanup(void);
-
-int dn_fib_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
-struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r,
-				       struct nlattr *attrs[],
-				       const struct nlmsghdr *nlh, int *errp);
-int dn_fib_semantic_match(int type, struct dn_fib_info *fi,
-			  const struct flowidn *fld, struct dn_fib_res *res);
-void dn_fib_release_info(struct dn_fib_info *fi);
-void dn_fib_flush(void);
-void dn_fib_select_multipath(const struct flowidn *fld, struct dn_fib_res *res);
-
-/*
- * dn_tables.c
- */
-struct dn_fib_table *dn_fib_get_table(u32 n, int creat);
-struct dn_fib_table *dn_fib_empty_table(void);
-void dn_fib_table_init(void);
-void dn_fib_table_cleanup(void);
-
-/*
- * dn_rules.c
- */
-void dn_fib_rules_init(void);
-void dn_fib_rules_cleanup(void);
-unsigned int dnet_addr_type(__le16 addr);
-int dn_fib_lookup(struct flowidn *fld, struct dn_fib_res *res);
-
-int dn_fib_dump(struct sk_buff *skb, struct netlink_callback *cb);
-
-void dn_fib_free_info(struct dn_fib_info *fi);
-
-static inline void dn_fib_info_put(struct dn_fib_info *fi)
-{
-	if (refcount_dec_and_test(&fi->fib_clntref))
-		dn_fib_free_info(fi);
-}
-
-static inline void dn_fib_res_put(struct dn_fib_res *res)
-{
-	if (res->fi)
-		dn_fib_info_put(res->fi);
-	if (res->r)
-		fib_rule_put(res->r);
-}
-
-#else /* Endnode */
-
-#define dn_fib_init()  do { } while(0)
-#define dn_fib_cleanup() do { } while(0)
-
-#define dn_fib_lookup(fl, res) (-ESRCH)
-#define dn_fib_info_put(fi) do { } while(0)
-#define dn_fib_select_multipath(fl, res) do { } while(0)
-#define dn_fib_rules_policy(saddr,res,flags) (0)
-#define dn_fib_res_put(res) do { } while(0)
-
-#endif /* CONFIG_DECNET_ROUTER */
-
-static inline __le16 dnet_make_mask(int n)
-{
-	if (n)
-		return cpu_to_le16(~((1 << (16 - n)) - 1));
-	return cpu_to_le16(0);
-}
-
-#endif /* _NET_DN_FIB_H */