Release 4.14 net/decnet/dn_rules.c

// 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;
}

Contributors
Person
Tokens
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Commits
CommitProp
Steven Whitehouse
39
68.42%
1
33.33%
Linus Torvalds (pre-git)
14
24.56%
1
33.33%
David S. Miller
4
7.02%
1
33.33%
Total
57
100.00%
3
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Whitehouse
124
83.22%
2
40.00%
David S. Miller
13
8.72%
1
20.00%
Linus Torvalds (pre-git)
11
7.38%
1
20.00%
Adrian Bunk
1
0.67%
1
20.00%
Total
149
100.00%
5
100.00%


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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
48
51.61%
1
25.00%
Steven Whitehouse
29
31.18%
2
50.00%
David S. Miller
16
17.20%
1
25.00%
Total
93
100.00%
4
100.00%



static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
				 struct fib_rule_hdr *frh,
				 struct nlattr **tb)
{
	int err = -EINVAL;
	struct dn_fib_rule *r = (struct dn_fib_rule *)rule;

	if (frh->tos)
		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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Whitehouse
163
85.34%
3
50.00%
Linus Torvalds (pre-git)
20
10.47%
1
16.67%
Thomas Graf
6
3.14%
1
16.67%
Al Viro
2
1.05%
1
16.67%
Total
191
100.00%
6
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Whitehouse
106
87.60%
2
40.00%
Linus Torvalds (pre-git)
7
5.79%
1
20.00%
Thomas Graf
6
4.96%
1
20.00%
Al Viro
2
1.65%
1
20.00%
Total
121
100.00%
5
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Whitehouse
49
56.32%
1
20.00%
Linus Torvalds (pre-git)
27
31.03%
1
20.00%
Patrick McHardy
5
5.75%
1
20.00%
David S. Miller
4
4.60%
1
20.00%
Eric Dumazet
2
2.30%
1
20.00%
Total
87
100.00%
5
100.00%



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;
}

Contributors
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Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
46
44.66%
1
33.33%
Steven Whitehouse
44
42.72%
1
33.33%
David S. Miller
13
12.62%
1
33.33%
Total
103
100.00%
3
100.00%



static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops)
{
	dn_rt_cache_flush(-1);
}

Contributors
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Tokens
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CommitProp
Thomas Graf
13
76.47%
2
66.67%
Denis V. Lunev
4
23.53%
1
33.33%
Total
17
100.00%
3
100.00%


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));
}

Contributors
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CommitProp
Eric W. Biedermann
19
46.34%
1
20.00%
Denis V. Lunev
11
26.83%
2
40.00%
Linus Torvalds (pre-git)
8
19.51%
1
20.00%
Steven Whitehouse
3
7.32%
1
20.00%
Total
41
100.00%
5
100.00%



void __exit dn_fib_rules_cleanup(void)
{
	rtnl_lock();
	fib_rules_unregister(dn_fib_rules_ops);
	rtnl_unlock();
	rcu_barrier();
}


Contributors
Person
Tokens
Prop
Commits
CommitProp
Linus Torvalds (pre-git)
11
50.00%
1
25.00%
Américo Wang
6
27.27%
1
25.00%
Eric W. Biedermann
3
13.64%
1
25.00%
Steven Whitehouse
2
9.09%
1
25.00%
Total
22
100.00%
4
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Steven Whitehouse
661
61.49%
5
17.86%
Linus Torvalds (pre-git)
251
23.35%
1
3.57%
David S. Miller
50
4.65%
2
7.14%
Thomas Graf
42
3.91%
4
14.29%
Eric W. Biedermann
24
2.23%
1
3.57%
Denis V. Lunev
21
1.95%
4
14.29%
Patrick McHardy
8
0.74%
4
14.29%
Américo Wang
6
0.56%
1
3.57%
Al Viro
4
0.37%
1
3.57%
Paul Gortmaker
3
0.28%
1
3.57%
Eric Dumazet
2
0.19%
1
3.57%
Adrian Bunk
1
0.09%
1
3.57%
Greg Kroah-Hartman
1
0.09%
1
3.57%
Andi Kleen
1
0.09%
1
3.57%
Total
1075
100.00%
28
100.00%
Directory: net/decnet

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