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1// SPDX-License-Identifier: GPL-2.0
2
3/*
4 * DECnet An implementation of the DECnet protocol suite for the LINUX
5 * operating system. DECnet is implemented using the BSD Socket
6 * interface as the means of communication with the user level.
7 *
8 * DECnet Routing Forwarding Information Base (Rules)
9 *
10 * Author: Steve Whitehouse <SteveW@ACM.org>
11 * Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
12 *
13 *
14 * Changes:
15 * Steve Whitehouse <steve@chygwyn.com>
16 * Updated for Thomas Graf's generic rules
17 *
18 */
19#include <linux/net.h>
20#include <linux/init.h>
21#include <linux/netlink.h>
22#include <linux/rtnetlink.h>
23#include <linux/netdevice.h>
24#include <linux/spinlock.h>
25#include <linux/list.h>
26#include <linux/rcupdate.h>
27#include <linux/export.h>
28#include <net/neighbour.h>
29#include <net/dst.h>
30#include <net/flow.h>
31#include <net/fib_rules.h>
32#include <net/dn.h>
33#include <net/dn_fib.h>
34#include <net/dn_neigh.h>
35#include <net/dn_dev.h>
36#include <net/dn_route.h>
37
38static struct fib_rules_ops *dn_fib_rules_ops;
39
40struct dn_fib_rule
41{
42 struct fib_rule common;
43 unsigned char dst_len;
44 unsigned char src_len;
45 __le16 src;
46 __le16 srcmask;
47 __le16 dst;
48 __le16 dstmask;
49 __le16 srcmap;
50 u8 flags;
51};
52
53
54int dn_fib_lookup(struct flowidn *flp, struct dn_fib_res *res)
55{
56 struct fib_lookup_arg arg = {
57 .result = res,
58 };
59 int err;
60
61 err = fib_rules_lookup(dn_fib_rules_ops,
62 flowidn_to_flowi(flp), 0, &arg);
63 res->r = arg.rule;
64
65 return err;
66}
67
68static int dn_fib_rule_action(struct fib_rule *rule, struct flowi *flp,
69 int flags, struct fib_lookup_arg *arg)
70{
71 struct flowidn *fld = &flp->u.dn;
72 int err = -EAGAIN;
73 struct dn_fib_table *tbl;
74
75 switch(rule->action) {
76 case FR_ACT_TO_TBL:
77 break;
78
79 case FR_ACT_UNREACHABLE:
80 err = -ENETUNREACH;
81 goto errout;
82
83 case FR_ACT_PROHIBIT:
84 err = -EACCES;
85 goto errout;
86
87 case FR_ACT_BLACKHOLE:
88 default:
89 err = -EINVAL;
90 goto errout;
91 }
92
93 tbl = dn_fib_get_table(rule->table, 0);
94 if (tbl == NULL)
95 goto errout;
96
97 err = tbl->lookup(tbl, fld, (struct dn_fib_res *)arg->result);
98 if (err > 0)
99 err = -EAGAIN;
100errout:
101 return err;
102}
103
104static const struct nla_policy dn_fib_rule_policy[FRA_MAX+1] = {
105 FRA_GENERIC_POLICY,
106};
107
108static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
109{
110 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
111 struct flowidn *fld = &fl->u.dn;
112 __le16 daddr = fld->daddr;
113 __le16 saddr = fld->saddr;
114
115 if (((saddr ^ r->src) & r->srcmask) ||
116 ((daddr ^ r->dst) & r->dstmask))
117 return 0;
118
119 return 1;
120}
121
122static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
123 struct fib_rule_hdr *frh,
124 struct nlattr **tb)
125{
126 int err = -EINVAL;
127 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
128
129 if (frh->tos)
130 goto errout;
131
132 if (rule->table == RT_TABLE_UNSPEC) {
133 if (rule->action == FR_ACT_TO_TBL) {
134 struct dn_fib_table *table;
135
136 table = dn_fib_empty_table();
137 if (table == NULL) {
138 err = -ENOBUFS;
139 goto errout;
140 }
141
142 rule->table = table->n;
143 }
144 }
145
146 if (frh->src_len)
147 r->src = nla_get_le16(tb[FRA_SRC]);
148
149 if (frh->dst_len)
150 r->dst = nla_get_le16(tb[FRA_DST]);
151
152 r->src_len = frh->src_len;
153 r->srcmask = dnet_make_mask(r->src_len);
154 r->dst_len = frh->dst_len;
155 r->dstmask = dnet_make_mask(r->dst_len);
156 err = 0;
157errout:
158 return err;
159}
160
161static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
162 struct nlattr **tb)
163{
164 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
165
166 if (frh->src_len && (r->src_len != frh->src_len))
167 return 0;
168
169 if (frh->dst_len && (r->dst_len != frh->dst_len))
170 return 0;
171
172 if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC])))
173 return 0;
174
175 if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST])))
176 return 0;
177
178 return 1;
179}
180
181unsigned int dnet_addr_type(__le16 addr)
182{
183 struct flowidn fld = { .daddr = addr };
184 struct dn_fib_res res;
185 unsigned int ret = RTN_UNICAST;
186 struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0);
187
188 res.r = NULL;
189
190 if (tb) {
191 if (!tb->lookup(tb, &fld, &res)) {
192 ret = res.type;
193 dn_fib_res_put(&res);
194 }
195 }
196 return ret;
197}
198
199static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
200 struct fib_rule_hdr *frh)
201{
202 struct dn_fib_rule *r = (struct dn_fib_rule *)rule;
203
204 frh->dst_len = r->dst_len;
205 frh->src_len = r->src_len;
206 frh->tos = 0;
207
208 if ((r->dst_len &&
209 nla_put_le16(skb, FRA_DST, r->dst)) ||
210 (r->src_len &&
211 nla_put_le16(skb, FRA_SRC, r->src)))
212 goto nla_put_failure;
213 return 0;
214
215nla_put_failure:
216 return -ENOBUFS;
217}
218
219static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops)
220{
221 dn_rt_cache_flush(-1);
222}
223
224static const struct fib_rules_ops __net_initconst dn_fib_rules_ops_template = {
225 .family = AF_DECnet,
226 .rule_size = sizeof(struct dn_fib_rule),
227 .addr_size = sizeof(u16),
228 .action = dn_fib_rule_action,
229 .match = dn_fib_rule_match,
230 .configure = dn_fib_rule_configure,
231 .compare = dn_fib_rule_compare,
232 .fill = dn_fib_rule_fill,
233 .flush_cache = dn_fib_rule_flush_cache,
234 .nlgroup = RTNLGRP_DECnet_RULE,
235 .policy = dn_fib_rule_policy,
236 .owner = THIS_MODULE,
237 .fro_net = &init_net,
238};
239
240void __init dn_fib_rules_init(void)
241{
242 dn_fib_rules_ops =
243 fib_rules_register(&dn_fib_rules_ops_template, &init_net);
244 BUG_ON(IS_ERR(dn_fib_rules_ops));
245 BUG_ON(fib_default_rule_add(dn_fib_rules_ops, 0x7fff,
246 RT_TABLE_MAIN, 0));
247}
248
249void __exit dn_fib_rules_cleanup(void)
250{
251 rtnl_lock();
252 fib_rules_unregister(dn_fib_rules_ops);
253 rtnl_unlock();
254 rcu_barrier();
255}
256
257