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[/] [test_project/] [trunk/] [linux_sd_driver/] [net/] [ipv6/] [fib6_rules.c] - Blame information for rev 81

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1 62 marcus.erl 
/*
2 
 * net/ipv6/fib6_rules.c        IPv6 Routing Policy Rules
3 
 *
4 
 * Copyright (C)2003-2006 Helsinki University of Technology
5 
 * Copyright (C)2003-2006 USAGI/WIDE Project
6 
 *
7 
 *      This program is free software; you can redistribute it and/or
8 
 *      modify it under the terms of the GNU General Public License as
9 
 *      published by the Free Software Foundation, version 2.
10 
 *
11 
 * Authors
12 
 *      Thomas Graf             <tgraf@suug.ch>
13 
 *      Ville Nuorvala          <vnuorval@tcs.hut.fi>
14 
 */
15 
 
16 
#include <linux/netdevice.h>
17 
 
18 
#include <net/fib_rules.h>
19 
#include <net/ipv6.h>
20 
#include <net/addrconf.h>
21 
#include <net/ip6_route.h>
22 
#include <net/netlink.h>
23 
 
24 
struct fib6_rule
25 
{
26 
        struct fib_rule         common;
27 
        struct rt6key           src;
28 
        struct rt6key           dst;
29 
        u8                      tclass;
30 
};
31 
 
32 
static struct fib_rules_ops fib6_rules_ops;
33 
 
34 
struct dst_entry *fib6_rule_lookup(struct flowi *fl, int flags,
35 
                                   pol_lookup_t lookup)
36 
{
37 
        struct fib_lookup_arg arg = {
38 
                .lookup_ptr = lookup,
39 
        };
40 
 
41 
        fib_rules_lookup(&fib6_rules_ops, fl, flags, &arg);
42 
        if (arg.rule)
43 
                fib_rule_put(arg.rule);
44 
 
45 
        if (arg.result)
46 
                return arg.result;
47 
 
48 
        dst_hold(&ip6_null_entry.u.dst);
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        return &ip6_null_entry.u.dst;
50 
}
51 
 
52 
static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp,
53 
                            int flags, struct fib_lookup_arg *arg)
54 
{
55 
        struct rt6_info *rt = NULL;
56 
        struct fib6_table *table;
57 
        pol_lookup_t lookup = arg->lookup_ptr;
58 
 
59 
        switch (rule->action) {
60 
        case FR_ACT_TO_TBL:
61 
                break;
62 
        case FR_ACT_UNREACHABLE:
63 
                rt = &ip6_null_entry;
64 
                goto discard_pkt;
65 
        default:
66 
        case FR_ACT_BLACKHOLE:
67 
                rt = &ip6_blk_hole_entry;
68 
                goto discard_pkt;
69 
        case FR_ACT_PROHIBIT:
70 
                rt = &ip6_prohibit_entry;
71 
                goto discard_pkt;
72 
        }
73 
 
74 
        table = fib6_get_table(rule->table);
75 
        if (table)
76 
                rt = lookup(table, flp, flags);
77 
 
78 
        if (rt != &ip6_null_entry) {
79 
                struct fib6_rule *r = (struct fib6_rule *)rule;
80 
 
81 
                /*
82 
                 * If we need to find a source address for this traffic,
83 
                 * we check the result if it meets requirement of the rule.
84 
                 */
85 
                if ((rule->flags & FIB_RULE_FIND_SADDR) &&
86 
                    r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) {
87 
                        struct in6_addr saddr;
88 
                        if (ipv6_get_saddr(&rt->u.dst, &flp->fl6_dst,
89 
                                           &saddr))
90 
                                goto again;
91 
                        if (!ipv6_prefix_equal(&saddr, &r->src.addr,
92 
                                               r->src.plen))
93 
                                goto again;
94 
                        ipv6_addr_copy(&flp->fl6_src, &saddr);
95 
                }
96 
                goto out;
97 
        }
98 
again:
99 
        dst_release(&rt->u.dst);
100 
        rt = NULL;
101 
        goto out;
102 
 
103 
discard_pkt:
104 
        dst_hold(&rt->u.dst);
105 
out:
106 
        arg->result = rt;
107 
        return rt == NULL ? -EAGAIN : 0;
108 
}
109 
 
110 
 
111 
static int fib6_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
112 
{
113 
        struct fib6_rule *r = (struct fib6_rule *) rule;
114 
 
115 
        if (r->dst.plen &&
116 
            !ipv6_prefix_equal(&fl->fl6_dst, &r->dst.addr, r->dst.plen))
117 
                return 0;
118 
 
119 
        /*
120 
         * If FIB_RULE_FIND_SADDR is set and we do not have a
121 
         * source address for the traffic, we defer check for
122 
         * source address.
123 
         */
124 
        if (r->src.plen) {
125 
                if (flags & RT6_LOOKUP_F_HAS_SADDR) {
126 
                        if (!ipv6_prefix_equal(&fl->fl6_src, &r->src.addr,
127 
                                               r->src.plen))
128 
                                return 0;
129 
                } else if (!(r->common.flags & FIB_RULE_FIND_SADDR))
130 
                        return 0;
131 
        }
132 
 
133 
        if (r->tclass && r->tclass != ((ntohl(fl->fl6_flowlabel) >> 20) & 0xff))
134 
                return 0;
135 
 
136 
        return 1;
137 
}
138 
 
139 
static const struct nla_policy fib6_rule_policy[FRA_MAX+1] = {
140 
        FRA_GENERIC_POLICY,
141 
};
142 
 
143 
static int fib6_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
144 
                               struct nlmsghdr *nlh, struct fib_rule_hdr *frh,
145 
                               struct nlattr **tb)
146 
{
147 
        int err = -EINVAL;
148 
        struct fib6_rule *rule6 = (struct fib6_rule *) rule;
149 
 
150 
        if (rule->action == FR_ACT_TO_TBL) {
151 
                if (rule->table == RT6_TABLE_UNSPEC)
152 
                        goto errout;
153 
 
154 
                if (fib6_new_table(rule->table) == NULL) {
155 
                        err = -ENOBUFS;
156 
                        goto errout;
157 
                }
158 
        }
159 
 
160 
        if (frh->src_len)
161 
                nla_memcpy(&rule6->src.addr, tb[FRA_SRC],
162 
                           sizeof(struct in6_addr));
163 
 
164 
        if (frh->dst_len)
165 
                nla_memcpy(&rule6->dst.addr, tb[FRA_DST],
166 
                           sizeof(struct in6_addr));
167 
 
168 
        rule6->src.plen = frh->src_len;
169 
        rule6->dst.plen = frh->dst_len;
170 
        rule6->tclass = frh->tos;
171 
 
172 
        err = 0;
173 
errout:
174 
        return err;
175 
}
176 
 
177 
static int fib6_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
178 
                             struct nlattr **tb)
179 
{
180 
        struct fib6_rule *rule6 = (struct fib6_rule *) rule;
181 
 
182 
        if (frh->src_len && (rule6->src.plen != frh->src_len))
183 
                return 0;
184 
 
185 
        if (frh->dst_len && (rule6->dst.plen != frh->dst_len))
186 
                return 0;
187 
 
188 
        if (frh->tos && (rule6->tclass != frh->tos))
189 
                return 0;
190 
 
191 
        if (frh->src_len &&
192 
            nla_memcmp(tb[FRA_SRC], &rule6->src.addr, sizeof(struct in6_addr)))
193 
                return 0;
194 
 
195 
        if (frh->dst_len &&
196 
            nla_memcmp(tb[FRA_DST], &rule6->dst.addr, sizeof(struct in6_addr)))
197 
                return 0;
198 
 
199 
        return 1;
200 
}
201 
 
202 
static int fib6_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
203 
                          struct nlmsghdr *nlh, struct fib_rule_hdr *frh)
204 
{
205 
        struct fib6_rule *rule6 = (struct fib6_rule *) rule;
206 
 
207 
        frh->family = AF_INET6;
208 
        frh->dst_len = rule6->dst.plen;
209 
        frh->src_len = rule6->src.plen;
210 
        frh->tos = rule6->tclass;
211 
 
212 
        if (rule6->dst.plen)
213 
                NLA_PUT(skb, FRA_DST, sizeof(struct in6_addr),
214 
                        &rule6->dst.addr);
215 
 
216 
        if (rule6->src.plen)
217 
                NLA_PUT(skb, FRA_SRC, sizeof(struct in6_addr),
218 
                        &rule6->src.addr);
219 
 
220 
        return 0;
221 
 
222 
nla_put_failure:
223 
        return -ENOBUFS;
224 
}
225 
 
226 
static u32 fib6_rule_default_pref(void)
227 
{
228 
        return 0x3FFF;
229 
}
230 
 
231 
static size_t fib6_rule_nlmsg_payload(struct fib_rule *rule)
232 
{
233 
        return nla_total_size(16) /* dst */
234 
               + nla_total_size(16); /* src */
235 
}
236 
 
237 
static struct fib_rules_ops fib6_rules_ops = {
238 
        .family                 = AF_INET6,
239 
        .rule_size              = sizeof(struct fib6_rule),
240 
        .addr_size              = sizeof(struct in6_addr),
241 
        .action                 = fib6_rule_action,
242 
        .match                  = fib6_rule_match,
243 
        .configure              = fib6_rule_configure,
244 
        .compare                = fib6_rule_compare,
245 
        .fill                   = fib6_rule_fill,
246 
        .default_pref           = fib6_rule_default_pref,
247 
        .nlmsg_payload          = fib6_rule_nlmsg_payload,
248 
        .nlgroup                = RTNLGRP_IPV6_RULE,
249 
        .policy                 = fib6_rule_policy,
250 
        .rules_list             = LIST_HEAD_INIT(fib6_rules_ops.rules_list),
251 
        .owner                  = THIS_MODULE,
252 
};
253 
 
254 
static int __init fib6_default_rules_init(void)
255 
{
256 
        int err;
257 
 
258 
        err = fib_default_rule_add(&fib6_rules_ops, 0,
259 
                                   RT6_TABLE_LOCAL, FIB_RULE_PERMANENT);
260 
        if (err < 0)
261 
                return err;
262 
        err = fib_default_rule_add(&fib6_rules_ops, 0x7FFE, RT6_TABLE_MAIN, 0);
263 
        if (err < 0)
264 
                return err;
265 
        return 0;
266 
}
267 
 
268 
void __init fib6_rules_init(void)
269 
{
270 
        BUG_ON(fib6_default_rules_init());
271 
        fib_rules_register(&fib6_rules_ops);
272 
}
273 
 
274 
void fib6_rules_cleanup(void)
275 
{
276 
        fib_rules_unregister(&fib6_rules_ops);
277 
}

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