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[/] [or1k_soc_on_altera_embedded_dev_kit/] [trunk/] [linux-2.6/] [linux-2.6.24/] [net/] [ipv6/] [netfilter/] [ip6t_rt.c] - Blame information for rev 3

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Line No. Rev Author Line
1 3 xianfeng 
/* Kernel module to match ROUTING parameters. */
2 
 
3 
/* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
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 *
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 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License version 2 as
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 * published by the Free Software Foundation.
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 */
9 
 
10 
#include <linux/module.h>
11 
#include <linux/skbuff.h>
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#include <linux/ipv6.h>
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#include <linux/types.h>
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#include <net/checksum.h>
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#include <net/ipv6.h>
16 
 
17 
#include <asm/byteorder.h>
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19 
#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <linux/netfilter_ipv6/ip6t_rt.h>
22 
 
23 
MODULE_LICENSE("GPL");
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MODULE_DESCRIPTION("IPv6 RT match");
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MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
26 
 
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/* Returns 1 if the id is matched by the range, 0 otherwise */
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static inline bool
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segsleft_match(u_int32_t min, u_int32_t max, u_int32_t id, bool invert)
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{
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        bool r;
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        pr_debug("rt segsleft_match:%c 0x%x <= 0x%x <= 0x%x",
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                 invert ? '!' : ' ', min, id, max);
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        r = (id >= min && id <= max) ^ invert;
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        pr_debug(" result %s\n", r ? "PASS" : "FAILED");
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        return r;
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}
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static bool
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match(const struct sk_buff *skb,
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      const struct net_device *in,
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      const struct net_device *out,
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      const struct xt_match *match,
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      const void *matchinfo,
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      int offset,
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      unsigned int protoff,
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      bool *hotdrop)
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{
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        struct ipv6_rt_hdr _route;
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        const struct ipv6_rt_hdr *rh;
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        const struct ip6t_rt *rtinfo = matchinfo;
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        unsigned int temp;
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        unsigned int ptr;
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        unsigned int hdrlen = 0;
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        bool ret = false;
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        struct in6_addr _addr;
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        const struct in6_addr *ap;
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        int err;
59 
 
60 
        err = ipv6_find_hdr(skb, &ptr, NEXTHDR_ROUTING, NULL);
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        if (err < 0) {
62 
                if (err != -ENOENT)
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                        *hotdrop = true;
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                return false;
65 
        }
66 
 
67 
        rh = skb_header_pointer(skb, ptr, sizeof(_route), &_route);
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        if (rh == NULL) {
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                *hotdrop = true;
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                return false;
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        }
72 
 
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        hdrlen = ipv6_optlen(rh);
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        if (skb->len - ptr < hdrlen) {
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                /* Pcket smaller than its length field */
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                return false;
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        }
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        pr_debug("IPv6 RT LEN %u %u ", hdrlen, rh->hdrlen);
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        pr_debug("TYPE %04X ", rh->type);
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        pr_debug("SGS_LEFT %u %02X\n", rh->segments_left, rh->segments_left);
82 
 
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        pr_debug("IPv6 RT segsleft %02X ",
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                 segsleft_match(rtinfo->segsleft[0], rtinfo->segsleft[1],
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                                rh->segments_left,
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                                !!(rtinfo->invflags & IP6T_RT_INV_SGS)));
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        pr_debug("type %02X %02X %02X ",
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                 rtinfo->rt_type, rh->type,
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                 (!(rtinfo->flags & IP6T_RT_TYP) ||
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                  ((rtinfo->rt_type == rh->type) ^
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                   !!(rtinfo->invflags & IP6T_RT_INV_TYP))));
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        pr_debug("len %02X %04X %02X ",
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                 rtinfo->hdrlen, hdrlen,
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                 !(rtinfo->flags & IP6T_RT_LEN) ||
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                  ((rtinfo->hdrlen == hdrlen) ^
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                   !!(rtinfo->invflags & IP6T_RT_INV_LEN)));
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        pr_debug("res %02X %02X %02X ",
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                 rtinfo->flags & IP6T_RT_RES,
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                 ((const struct rt0_hdr *)rh)->reserved,
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                 !((rtinfo->flags & IP6T_RT_RES) &&
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                   (((const struct rt0_hdr *)rh)->reserved)));
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        ret = (rh != NULL)
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              &&
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              (segsleft_match(rtinfo->segsleft[0], rtinfo->segsleft[1],
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                              rh->segments_left,
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                              !!(rtinfo->invflags & IP6T_RT_INV_SGS)))
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              &&
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              (!(rtinfo->flags & IP6T_RT_LEN) ||
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               ((rtinfo->hdrlen == hdrlen) ^
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                !!(rtinfo->invflags & IP6T_RT_INV_LEN)))
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              &&
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              (!(rtinfo->flags & IP6T_RT_TYP) ||
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               ((rtinfo->rt_type == rh->type) ^
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                !!(rtinfo->invflags & IP6T_RT_INV_TYP)));
116 
 
117 
        if (ret && (rtinfo->flags & IP6T_RT_RES)) {
118 
                u_int32_t *rp, _reserved;
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                rp = skb_header_pointer(skb,
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                                        ptr + offsetof(struct rt0_hdr,
121 
                                                       reserved),
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                                        sizeof(_reserved),
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                                        &_reserved);
124 
 
125 
                ret = (*rp == 0);
126 
        }
127 
 
128 
        pr_debug("#%d ", rtinfo->addrnr);
129 
        if (!(rtinfo->flags & IP6T_RT_FST)) {
130 
                return ret;
131 
        } else if (rtinfo->flags & IP6T_RT_FST_NSTRICT) {
132 
                pr_debug("Not strict ");
133 
                if (rtinfo->addrnr > (unsigned int)((hdrlen - 8) / 16)) {
134 
                        pr_debug("There isn't enough space\n");
135 
                        return false;
136 
                } else {
137 
                        unsigned int i = 0;
138 
 
139 
                        pr_debug("#%d ", rtinfo->addrnr);
140 
                        for (temp = 0;
141 
                             temp < (unsigned int)((hdrlen - 8) / 16);
142 
                             temp++) {
143 
                                ap = skb_header_pointer(skb,
144 
                                                        ptr
145 
                                                        + sizeof(struct rt0_hdr)
146 
                                                        + temp * sizeof(_addr),
147 
                                                        sizeof(_addr),
148 
                                                        &_addr);
149 
 
150 
                                BUG_ON(ap == NULL);
151 
 
152 
                                if (ipv6_addr_equal(ap, &rtinfo->addrs[i])) {
153 
                                        pr_debug("i=%d temp=%d;\n", i, temp);
154 
                                        i++;
155 
                                }
156 
                                if (i == rtinfo->addrnr)
157 
                                        break;
158 
                        }
159 
                        pr_debug("i=%d #%d\n", i, rtinfo->addrnr);
160 
                        if (i == rtinfo->addrnr)
161 
                                return ret;
162 
                        else
163 
                                return false;
164 
                }
165 
        } else {
166 
                pr_debug("Strict ");
167 
                if (rtinfo->addrnr > (unsigned int)((hdrlen - 8) / 16)) {
168 
                        pr_debug("There isn't enough space\n");
169 
                        return false;
170 
                } else {
171 
                        pr_debug("#%d ", rtinfo->addrnr);
172 
                        for (temp = 0; temp < rtinfo->addrnr; temp++) {
173 
                                ap = skb_header_pointer(skb,
174 
                                                        ptr
175 
                                                        + sizeof(struct rt0_hdr)
176 
                                                        + temp * sizeof(_addr),
177 
                                                        sizeof(_addr),
178 
                                                        &_addr);
179 
                                BUG_ON(ap == NULL);
180 
 
181 
                                if (!ipv6_addr_equal(ap, &rtinfo->addrs[temp]))
182 
                                        break;
183 
                        }
184 
                        pr_debug("temp=%d #%d\n", temp, rtinfo->addrnr);
185 
                        if (temp == rtinfo->addrnr &&
186 
                            temp == (unsigned int)((hdrlen - 8) / 16))
187 
                                return ret;
188 
                        else
189 
                                return false;
190 
                }
191 
        }
192 
 
193 
        return false;
194 
}
195 
 
196 
/* Called when user tries to insert an entry of this type. */
197 
static bool
198 
checkentry(const char *tablename,
199 
           const void *entry,
200 
           const struct xt_match *match,
201 
           void *matchinfo,
202 
           unsigned int hook_mask)
203 
{
204 
        const struct ip6t_rt *rtinfo = matchinfo;
205 
 
206 
        if (rtinfo->invflags & ~IP6T_RT_INV_MASK) {
207 
                pr_debug("ip6t_rt: unknown flags %X\n", rtinfo->invflags);
208 
                return false;
209 
        }
210 
        if ((rtinfo->flags & (IP6T_RT_RES | IP6T_RT_FST_MASK)) &&
211 
            (!(rtinfo->flags & IP6T_RT_TYP) ||
212 
             (rtinfo->rt_type != 0) ||
213 
             (rtinfo->invflags & IP6T_RT_INV_TYP))) {
214 
                pr_debug("`--rt-type 0' required before `--rt-0-*'");
215 
                return false;
216 
        }
217 
 
218 
        return true;
219 
}
220 
 
221 
static struct xt_match rt_match __read_mostly = {
222 
        .name           = "rt",
223 
        .family         = AF_INET6,
224 
        .match          = match,
225 
        .matchsize      = sizeof(struct ip6t_rt),
226 
        .checkentry     = checkentry,
227 
        .me             = THIS_MODULE,
228 
};
229 
 
230 
static int __init ip6t_rt_init(void)
231 
{
232 
        return xt_register_match(&rt_match);
233 
}
234 
 
235 
static void __exit ip6t_rt_fini(void)
236 
{
237 
        xt_unregister_match(&rt_match);
238 
}
239 
 
240 
module_init(ip6t_rt_init);
241 
module_exit(ip6t_rt_fini);

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