]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | |
2 | /* | |
3 | * DECnet An implementation of the DECnet protocol suite for the LINUX | |
4 | * operating system. DECnet is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * DECnet Routing Forwarding Information Base (Rules) | |
8 | * | |
9 | * Author: Steve Whitehouse <SteveW@ACM.org> | |
10 | * Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c | |
11 | * | |
12 | * | |
13 | * Changes: | |
a8731cbf SW |
14 | * Steve Whitehouse <steve@chygwyn.com> |
15 | * Updated for Thomas Graf's generic rules | |
1da177e4 LT |
16 | * |
17 | */ | |
1da177e4 | 18 | #include <linux/net.h> |
1da177e4 | 19 | #include <linux/init.h> |
1da177e4 LT |
20 | #include <linux/netlink.h> |
21 | #include <linux/rtnetlink.h> | |
1da177e4 | 22 | #include <linux/netdevice.h> |
1da177e4 | 23 | #include <linux/spinlock.h> |
ecba320f SW |
24 | #include <linux/list.h> |
25 | #include <linux/rcupdate.h> | |
1da177e4 LT |
26 | #include <net/neighbour.h> |
27 | #include <net/dst.h> | |
28 | #include <net/flow.h> | |
a8731cbf | 29 | #include <net/fib_rules.h> |
1da177e4 LT |
30 | #include <net/dn.h> |
31 | #include <net/dn_fib.h> | |
32 | #include <net/dn_neigh.h> | |
33 | #include <net/dn_dev.h> | |
34 | ||
a8731cbf SW |
35 | static struct fib_rules_ops dn_fib_rules_ops; |
36 | ||
1da177e4 LT |
37 | struct dn_fib_rule |
38 | { | |
a8731cbf SW |
39 | struct fib_rule common; |
40 | unsigned char dst_len; | |
41 | unsigned char src_len; | |
42 | __le16 src; | |
43 | __le16 srcmask; | |
44 | __le16 dst; | |
45 | __le16 dstmask; | |
46 | __le16 srcmap; | |
47 | u8 flags; | |
1da177e4 LT |
48 | }; |
49 | ||
50 | static struct dn_fib_rule default_rule = { | |
a8731cbf SW |
51 | .common = { |
52 | .refcnt = ATOMIC_INIT(2), | |
53 | .pref = 0x7fff, | |
54 | .table = RT_TABLE_MAIN, | |
55 | .action = FR_ACT_TO_TBL, | |
56 | }, | |
1da177e4 LT |
57 | }; |
58 | ||
a8731cbf SW |
59 | static LIST_HEAD(dn_fib_rules); |
60 | ||
1da177e4 | 61 | |
a8731cbf | 62 | int dn_fib_lookup(struct flowi *flp, struct dn_fib_res *res) |
1da177e4 | 63 | { |
a8731cbf SW |
64 | struct fib_lookup_arg arg = { |
65 | .result = res, | |
66 | }; | |
67 | int err; | |
68 | ||
69 | err = fib_rules_lookup(&dn_fib_rules_ops, flp, 0, &arg); | |
70 | res->r = arg.rule; | |
1da177e4 LT |
71 | |
72 | return err; | |
73 | } | |
74 | ||
2aa7f36c AB |
75 | static int dn_fib_rule_action(struct fib_rule *rule, struct flowi *flp, |
76 | int flags, struct fib_lookup_arg *arg) | |
ecba320f | 77 | { |
a8731cbf SW |
78 | int err = -EAGAIN; |
79 | struct dn_fib_table *tbl; | |
ecba320f | 80 | |
a8731cbf SW |
81 | switch(rule->action) { |
82 | case FR_ACT_TO_TBL: | |
83 | break; | |
84 | ||
85 | case FR_ACT_UNREACHABLE: | |
86 | err = -ENETUNREACH; | |
87 | goto errout; | |
88 | ||
89 | case FR_ACT_PROHIBIT: | |
90 | err = -EACCES; | |
91 | goto errout; | |
92 | ||
93 | case FR_ACT_BLACKHOLE: | |
94 | default: | |
95 | err = -EINVAL; | |
96 | goto errout; | |
1da177e4 | 97 | } |
a8731cbf SW |
98 | |
99 | tbl = dn_fib_get_table(rule->table, 0); | |
100 | if (tbl == NULL) | |
101 | goto errout; | |
102 | ||
103 | err = tbl->lookup(tbl, flp, (struct dn_fib_res *)arg->result); | |
104 | if (err > 0) | |
105 | err = -EAGAIN; | |
106 | errout: | |
107 | return err; | |
1da177e4 LT |
108 | } |
109 | ||
a8731cbf | 110 | static struct nla_policy dn_fib_rule_policy[FRA_MAX+1] __read_mostly = { |
5176f91e | 111 | [FRA_IFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, |
a8731cbf SW |
112 | [FRA_PRIORITY] = { .type = NLA_U32 }, |
113 | [FRA_SRC] = { .type = NLA_U16 }, | |
114 | [FRA_DST] = { .type = NLA_U16 }, | |
115 | [FRA_FWMARK] = { .type = NLA_U32 }, | |
88e91f29 | 116 | [FRA_FWMASK] = { .type = NLA_U32 }, |
d880309a | 117 | [FRA_TABLE] = { .type = NLA_U32 }, |
a8731cbf | 118 | }; |
1da177e4 | 119 | |
a8731cbf | 120 | static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) |
1da177e4 | 121 | { |
a8731cbf | 122 | struct dn_fib_rule *r = (struct dn_fib_rule *)rule; |
375d9d71 SW |
123 | __le16 daddr = fl->fld_dst; |
124 | __le16 saddr = fl->fld_src; | |
a8731cbf SW |
125 | |
126 | if (((saddr ^ r->src) & r->srcmask) || | |
127 | ((daddr ^ r->dst) & r->dstmask)) | |
128 | return 0; | |
1da177e4 | 129 | |
a8731cbf SW |
130 | return 1; |
131 | } | |
132 | ||
133 | static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb, | |
134 | struct nlmsghdr *nlh, struct fib_rule_hdr *frh, | |
135 | struct nlattr **tb) | |
136 | { | |
137 | int err = -EINVAL; | |
138 | struct dn_fib_rule *r = (struct dn_fib_rule *)rule; | |
139 | ||
140 | if (frh->src_len > 16 || frh->dst_len > 16 || frh->tos) | |
141 | goto errout; | |
142 | ||
143 | if (rule->table == RT_TABLE_UNSPEC) { | |
144 | if (rule->action == FR_ACT_TO_TBL) { | |
145 | struct dn_fib_table *table; | |
146 | ||
147 | table = dn_fib_empty_table(); | |
148 | if (table == NULL) { | |
149 | err = -ENOBUFS; | |
150 | goto errout; | |
151 | } | |
152 | ||
153 | rule->table = table->n; | |
1da177e4 LT |
154 | } |
155 | } | |
156 | ||
a8731cbf SW |
157 | if (tb[FRA_SRC]) |
158 | r->src = nla_get_u16(tb[FRA_SRC]); | |
ecba320f | 159 | |
a8731cbf SW |
160 | if (tb[FRA_DST]) |
161 | r->dst = nla_get_u16(tb[FRA_DST]); | |
1da177e4 | 162 | |
a8731cbf SW |
163 | r->src_len = frh->src_len; |
164 | r->srcmask = dnet_make_mask(r->src_len); | |
165 | r->dst_len = frh->dst_len; | |
166 | r->dstmask = dnet_make_mask(r->dst_len); | |
167 | err = 0; | |
168 | errout: | |
169 | return err; | |
170 | } | |
1da177e4 | 171 | |
a8731cbf SW |
172 | static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, |
173 | struct nlattr **tb) | |
1da177e4 | 174 | { |
a8731cbf SW |
175 | struct dn_fib_rule *r = (struct dn_fib_rule *)rule; |
176 | ||
177 | if (frh->src_len && (r->src_len != frh->src_len)) | |
178 | return 0; | |
1da177e4 | 179 | |
a8731cbf SW |
180 | if (frh->dst_len && (r->dst_len != frh->dst_len)) |
181 | return 0; | |
ecba320f | 182 | |
d1aa62f1 | 183 | if (tb[FRA_SRC] && (r->src != nla_get_u16(tb[FRA_SRC]))) |
a8731cbf SW |
184 | return 0; |
185 | ||
d1aa62f1 | 186 | if (tb[FRA_DST] && (r->dst != nla_get_u16(tb[FRA_DST]))) |
a8731cbf | 187 | return 0; |
1da177e4 | 188 | |
a8731cbf | 189 | return 1; |
1da177e4 LT |
190 | } |
191 | ||
c4ea94ab | 192 | unsigned dnet_addr_type(__le16 addr) |
1da177e4 LT |
193 | { |
194 | struct flowi fl = { .nl_u = { .dn_u = { .daddr = addr } } }; | |
195 | struct dn_fib_res res; | |
196 | unsigned ret = RTN_UNICAST; | |
abcab268 | 197 | struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0); |
1da177e4 LT |
198 | |
199 | res.r = NULL; | |
200 | ||
201 | if (tb) { | |
202 | if (!tb->lookup(tb, &fl, &res)) { | |
203 | ret = res.type; | |
204 | dn_fib_res_put(&res); | |
205 | } | |
206 | } | |
207 | return ret; | |
208 | } | |
209 | ||
a8731cbf SW |
210 | static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb, |
211 | struct nlmsghdr *nlh, struct fib_rule_hdr *frh) | |
1da177e4 | 212 | { |
a8731cbf | 213 | struct dn_fib_rule *r = (struct dn_fib_rule *)rule; |
1da177e4 | 214 | |
a8731cbf SW |
215 | frh->family = AF_DECnet; |
216 | frh->dst_len = r->dst_len; | |
217 | frh->src_len = r->src_len; | |
218 | frh->tos = 0; | |
1da177e4 | 219 | |
a8731cbf SW |
220 | if (r->dst_len) |
221 | NLA_PUT_U16(skb, FRA_DST, r->dst); | |
222 | if (r->src_len) | |
223 | NLA_PUT_U16(skb, FRA_SRC, r->src); | |
1da177e4 | 224 | |
a8731cbf | 225 | return 0; |
1da177e4 | 226 | |
a8731cbf SW |
227 | nla_put_failure: |
228 | return -ENOBUFS; | |
1da177e4 LT |
229 | } |
230 | ||
a8731cbf | 231 | static u32 dn_fib_rule_default_pref(void) |
1da177e4 | 232 | { |
a8731cbf SW |
233 | struct list_head *pos; |
234 | struct fib_rule *rule; | |
235 | ||
236 | if (!list_empty(&dn_fib_rules)) { | |
237 | pos = dn_fib_rules.next; | |
238 | if (pos->next != &dn_fib_rules) { | |
239 | rule = list_entry(pos->next, struct fib_rule, list); | |
240 | if (rule->pref) | |
241 | return rule->pref - 1; | |
242 | } | |
1da177e4 LT |
243 | } |
244 | ||
a8731cbf | 245 | return 0; |
1da177e4 LT |
246 | } |
247 | ||
248 | int dn_fib_dump_rules(struct sk_buff *skb, struct netlink_callback *cb) | |
249 | { | |
a8731cbf | 250 | return fib_rules_dump(skb, cb, AF_DECnet); |
1da177e4 LT |
251 | } |
252 | ||
a8731cbf SW |
253 | static struct fib_rules_ops dn_fib_rules_ops = { |
254 | .family = AF_DECnet, | |
255 | .rule_size = sizeof(struct dn_fib_rule), | |
256 | .action = dn_fib_rule_action, | |
257 | .match = dn_fib_rule_match, | |
258 | .configure = dn_fib_rule_configure, | |
259 | .compare = dn_fib_rule_compare, | |
260 | .fill = dn_fib_rule_fill, | |
261 | .default_pref = dn_fib_rule_default_pref, | |
262 | .nlgroup = RTNLGRP_DECnet_RULE, | |
263 | .policy = dn_fib_rule_policy, | |
264 | .rules_list = &dn_fib_rules, | |
265 | .owner = THIS_MODULE, | |
266 | }; | |
267 | ||
1da177e4 LT |
268 | void __init dn_fib_rules_init(void) |
269 | { | |
a8731cbf SW |
270 | list_add_tail(&default_rule.common.list, &dn_fib_rules); |
271 | fib_rules_register(&dn_fib_rules_ops); | |
1da177e4 LT |
272 | } |
273 | ||
274 | void __exit dn_fib_rules_cleanup(void) | |
275 | { | |
a8731cbf | 276 | fib_rules_unregister(&dn_fib_rules_ops); |
1da177e4 LT |
277 | } |
278 | ||
279 |