Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 258 insertions, 0 deletions

diff --git a/net/decnet/dn_rules.c b/net/decnet/dn_rules.c
new file mode 100644
index 000000000..4a4e3c177
--- /dev/null
+++ b/net/decnet/dn_rules.c
@@ -0,0 +1,258 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * DECnet       An implementation of the DECnet protocol suite for the LINUX
+ *              operating system.  DECnet is implemented using the  BSD Socket
+ *              interface as the means of communication with the user level.
+ *
+ *              DECnet Routing Forwarding Information Base (Rules)
+ *
+ * Author:      Steve Whitehouse <SteveW@ACM.org>
+ *              Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
+ *
+ *
+ * Changes:
+ *              Steve Whitehouse <steve@chygwyn.com>
+ *              Updated for Thomas Graf's generic rules
+ *
+ */
+#include <linux/net.h>
+#include <linux/init.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <linux/netdevice.h>
+#include <linux/spinlock.h>
+#include <linux/list.h>
+#include <linux/rcupdate.h>
+#include <linux/export.h>
+#include <net/neighbour.h>
+#include <net/dst.h>
+#include <net/flow.h>
+#include <net/fib_rules.h>
+#include <net/dn.h>
+#include <net/dn_fib.h>
+#include <net/dn_neigh.h>
+#include <net/dn_dev.h>
+#include <net/dn_route.h>
+
+static struct fib_rules_ops *dn_fib_rules_ops;
+
+struct dn_fib_rule
+{
+	struct fib_rule		common;
+	unsigned char		dst_len;
+	unsigned char		src_len;
+	__le16			src;
+	__le16			srcmask;
+	__le16			dst;
+	__le16			dstmask;
+	__le16			srcmap;
+	u8			flags;
+};
+
+
+int dn_fib_lookup(struct flowidn *flp, struct dn_fib_res *res)
+{
+	struct fib_lookup_arg arg = {
+		.result = res,
+	};
+	int err;
+
+	err = fib_rules_lookup(dn_fib_rules_ops,
+			       flowidn_to_flowi(flp), 0, &arg);
+	res->r = arg.rule;
+
+	return err;
+}
+
+static int dn_fib_rule_action(struct fib_rule *rule, struct flowi *flp,
+			      int flags, struct fib_lookup_arg *arg)
+{
+	struct flowidn *fld = &flp->u.dn;
+	int err = -EAGAIN;
+	struct dn_fib_table *tbl;
+
+	switch(rule->action) {
+	case FR_ACT_TO_TBL:
+		break;
+
+	case FR_ACT_UNREACHABLE:
+		err = -ENETUNREACH;
+		goto errout;
+
+	case FR_ACT_PROHIBIT:
+		err = -EACCES;
+		goto errout;
+
+	case FR_ACT_BLACKHOLE:
+	default:
+		err = -EINVAL;
+		goto errout;
+	}
+
+	tbl = dn_fib_get_table(rule->table, 0);
+	if (tbl == NULL)
+		goto errout;
+
+	err = tbl->lookup(tbl, fld, (struct dn_fib_res *)arg->result);
+	if (err > 0)
+		err = -EAGAIN;
+errout:
+	return err;
+}
+
+static const struct nla_policy dn_fib_rule_policy[FRA_MAX+1] = {
+	FRA_GENERIC_POLICY,
+};
+
+static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
+{
+	struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
+	struct flowidn *fld = &fl->u.dn;
+	__le16 daddr = fld->daddr;
+	__le16 saddr = fld->saddr;
+
+	if (((saddr ^ r->src) & r->srcmask) ||
+	    ((daddr ^ r->dst) & r->dstmask))
+		return 0;
+
+	return 1;
+}
+
+static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
+				 struct fib_rule_hdr *frh,
+				 struct nlattr **tb,
+				 struct netlink_ext_ack *extack)
+{
+	int err = -EINVAL;
+	struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
+
+	if (frh->tos) {
+		NL_SET_ERR_MSG(extack, "Invalid tos value");
+		goto  errout;
+	}
+
+	if (rule->table == RT_TABLE_UNSPEC) {
+		if (rule->action == FR_ACT_TO_TBL) {
+			struct dn_fib_table *table;
+
+			table = dn_fib_empty_table();
+			if (table == NULL) {
+				err = -ENOBUFS;
+				goto errout;
+			}
+
+			rule->table = table->n;
+		}
+	}
+
+	if (frh->src_len)
+		r->src = nla_get_le16(tb[FRA_SRC]);
+
+	if (frh->dst_len)
+		r->dst = nla_get_le16(tb[FRA_DST]);
+
+	r->src_len = frh->src_len;
+	r->srcmask = dnet_make_mask(r->src_len);
+	r->dst_len = frh->dst_len;
+	r->dstmask = dnet_make_mask(r->dst_len);
+	err = 0;
+errout:
+	return err;
+}
+
+static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
+			       struct nlattr **tb)
+{
+	struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
+
+	if (frh->src_len && (r->src_len != frh->src_len))
+		return 0;
+
+	if (frh->dst_len && (r->dst_len != frh->dst_len))
+		return 0;
+
+	if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC])))
+		return 0;
+
+	if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST])))
+		return 0;
+
+	return 1;
+}
+
+unsigned int dnet_addr_type(__le16 addr)
+{
+	struct flowidn fld = { .daddr = addr };
+	struct dn_fib_res res;
+	unsigned int ret = RTN_UNICAST;
+	struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0);
+
+	res.r = NULL;
+
+	if (tb) {
+		if (!tb->lookup(tb, &fld, &res)) {
+			ret = res.type;
+			dn_fib_res_put(&res);
+		}
+	}
+	return ret;
+}
+
+static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
+			    struct fib_rule_hdr *frh)
+{
+	struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
+
+	frh->dst_len = r->dst_len;
+	frh->src_len = r->src_len;
+	frh->tos = 0;
+
+	if ((r->dst_len &&
+	     nla_put_le16(skb, FRA_DST, r->dst)) ||
+	    (r->src_len &&
+	     nla_put_le16(skb, FRA_SRC, r->src)))
+		goto nla_put_failure;
+	return 0;
+
+nla_put_failure:
+	return -ENOBUFS;
+}
+
+static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops)
+{
+	dn_rt_cache_flush(-1);
+}
+
+static const struct fib_rules_ops __net_initconst dn_fib_rules_ops_template = {
+	.family		= AF_DECnet,
+	.rule_size	= sizeof(struct dn_fib_rule),
+	.addr_size	= sizeof(u16),
+	.action		= dn_fib_rule_action,
+	.match		= dn_fib_rule_match,
+	.configure	= dn_fib_rule_configure,
+	.compare	= dn_fib_rule_compare,
+	.fill		= dn_fib_rule_fill,
+	.flush_cache	= dn_fib_rule_flush_cache,
+	.nlgroup	= RTNLGRP_DECnet_RULE,
+	.policy		= dn_fib_rule_policy,
+	.owner		= THIS_MODULE,
+	.fro_net	= &init_net,
+};
+
+void __init dn_fib_rules_init(void)
+{
+	dn_fib_rules_ops =
+		fib_rules_register(&dn_fib_rules_ops_template, &init_net);
+	BUG_ON(IS_ERR(dn_fib_rules_ops));
+	BUG_ON(fib_default_rule_add(dn_fib_rules_ops, 0x7fff,
+			            RT_TABLE_MAIN, 0));
+}
+
+void __exit dn_fib_rules_cleanup(void)
+{
+	rtnl_lock();
+	fib_rules_unregister(dn_fib_rules_ops);
+	rtnl_unlock();
+	rcu_barrier();
+}