1 /* Kernel module to match ROUTING parameters. */
3 /* (C) 2001-2002 Andras Kis-Szabo <kisza@sch.bme.hu>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
10 #include <linux/module.h>
11 #include <linux/skbuff.h>
12 #include <linux/ipv6.h>
13 #include <linux/types.h>
14 #include <net/checksum.h>
17 #include <asm/byteorder.h>
19 #include <linux/netfilter_ipv6/ip6_tables.h>
20 #include <linux/netfilter_ipv6/ip6t_rt.h>
22 MODULE_LICENSE("GPL");
23 MODULE_DESCRIPTION("IPv6 RT match");
24 MODULE_AUTHOR("Andras Kis-Szabo <kisza@sch.bme.hu>");
29 #define DEBUGP(format, args...)
32 /* Returns 1 if the id is matched by the range, 0 otherwise */
34 segsleft_match(u_int32_t min
, u_int32_t max
, u_int32_t id
, int invert
)
37 DEBUGP("rt segsleft_match:%c 0x%x <= 0x%x <= 0x%x",invert
? '!':' ',
39 r
=(id
>= min
&& id
<= max
) ^ invert
;
40 DEBUGP(" result %s\n",r
? "PASS" : "FAILED");
45 match(const struct sk_buff
*skb
,
46 const struct net_device
*in
,
47 const struct net_device
*out
,
48 const void *matchinfo
,
53 struct ipv6_rt_hdr _route
, *rh
;
54 const struct ip6t_rt
*rtinfo
= matchinfo
;
57 unsigned int hdrlen
= 0;
59 struct in6_addr
*ap
, _addr
;
61 if (ipv6_find_hdr(skb
, &ptr
, NEXTHDR_ROUTING
, NULL
) < 0)
64 rh
= skb_header_pointer(skb
, ptr
, sizeof(_route
), &_route
);
70 hdrlen
= ipv6_optlen(rh
);
71 if (skb
->len
- ptr
< hdrlen
){
72 /* Pcket smaller than its length field */
76 DEBUGP("IPv6 RT LEN %u %u ", hdrlen
, rh
->hdrlen
);
77 DEBUGP("TYPE %04X ", rh
->type
);
78 DEBUGP("SGS_LEFT %u %02X\n", rh
->segments_left
, rh
->segments_left
);
80 DEBUGP("IPv6 RT segsleft %02X ",
81 (segsleft_match(rtinfo
->segsleft
[0], rtinfo
->segsleft
[1],
83 !!(rtinfo
->invflags
& IP6T_RT_INV_SGS
))));
84 DEBUGP("type %02X %02X %02X ",
85 rtinfo
->rt_type
, rh
->type
,
86 (!(rtinfo
->flags
& IP6T_RT_TYP
) ||
87 ((rtinfo
->rt_type
== rh
->type
) ^
88 !!(rtinfo
->invflags
& IP6T_RT_INV_TYP
))));
89 DEBUGP("len %02X %04X %02X ",
90 rtinfo
->hdrlen
, hdrlen
,
91 (!(rtinfo
->flags
& IP6T_RT_LEN
) ||
92 ((rtinfo
->hdrlen
== hdrlen
) ^
93 !!(rtinfo
->invflags
& IP6T_RT_INV_LEN
))));
94 DEBUGP("res %02X %02X %02X ",
95 (rtinfo
->flags
& IP6T_RT_RES
), ((struct rt0_hdr
*)rh
)->reserved
,
96 !((rtinfo
->flags
& IP6T_RT_RES
) && (((struct rt0_hdr
*)rh
)->reserved
)));
100 (segsleft_match(rtinfo
->segsleft
[0], rtinfo
->segsleft
[1],
102 !!(rtinfo
->invflags
& IP6T_RT_INV_SGS
)))
104 (!(rtinfo
->flags
& IP6T_RT_LEN
) ||
105 ((rtinfo
->hdrlen
== hdrlen
) ^
106 !!(rtinfo
->invflags
& IP6T_RT_INV_LEN
)))
108 (!(rtinfo
->flags
& IP6T_RT_TYP
) ||
109 ((rtinfo
->rt_type
== rh
->type
) ^
110 !!(rtinfo
->invflags
& IP6T_RT_INV_TYP
)));
112 if (ret
&& (rtinfo
->flags
& IP6T_RT_RES
)) {
113 u_int32_t
*rp
, _reserved
;
114 rp
= skb_header_pointer(skb
,
115 ptr
+ offsetof(struct rt0_hdr
, reserved
),
116 sizeof(_reserved
), &_reserved
);
121 DEBUGP("#%d ",rtinfo
->addrnr
);
122 if ( !(rtinfo
->flags
& IP6T_RT_FST
) ){
124 } else if (rtinfo
->flags
& IP6T_RT_FST_NSTRICT
) {
125 DEBUGP("Not strict ");
126 if ( rtinfo
->addrnr
> (unsigned int)((hdrlen
-8)/16) ){
127 DEBUGP("There isn't enough space\n");
132 DEBUGP("#%d ",rtinfo
->addrnr
);
133 for(temp
=0; temp
<(unsigned int)((hdrlen
-8)/16); temp
++){
134 ap
= skb_header_pointer(skb
,
136 + sizeof(struct rt0_hdr
)
137 + temp
* sizeof(_addr
),
143 if (ipv6_addr_equal(ap
, &rtinfo
->addrs
[i
])) {
144 DEBUGP("i=%d temp=%d;\n",i
,temp
);
147 if (i
==rtinfo
->addrnr
) break;
149 DEBUGP("i=%d #%d\n", i
, rtinfo
->addrnr
);
150 if (i
== rtinfo
->addrnr
)
156 if ( rtinfo
->addrnr
> (unsigned int)((hdrlen
-8)/16) ){
157 DEBUGP("There isn't enough space\n");
160 DEBUGP("#%d ",rtinfo
->addrnr
);
161 for(temp
=0; temp
<rtinfo
->addrnr
; temp
++){
162 ap
= skb_header_pointer(skb
,
164 + sizeof(struct rt0_hdr
)
165 + temp
* sizeof(_addr
),
170 if (!ipv6_addr_equal(ap
, &rtinfo
->addrs
[temp
]))
173 DEBUGP("temp=%d #%d\n", temp
, rtinfo
->addrnr
);
174 if ((temp
== rtinfo
->addrnr
) && (temp
== (unsigned int)((hdrlen
-8)/16)))
183 /* Called when user tries to insert an entry of this type. */
185 checkentry(const char *tablename
,
186 const struct ip6t_ip6
*ip
,
188 unsigned int matchinfosize
,
189 unsigned int hook_mask
)
191 const struct ip6t_rt
*rtinfo
= matchinfo
;
193 if (matchinfosize
!= IP6T_ALIGN(sizeof(struct ip6t_rt
))) {
194 DEBUGP("ip6t_rt: matchsize %u != %u\n",
195 matchinfosize
, IP6T_ALIGN(sizeof(struct ip6t_rt
)));
198 if (rtinfo
->invflags
& ~IP6T_RT_INV_MASK
) {
199 DEBUGP("ip6t_rt: unknown flags %X\n",
203 if ( (rtinfo
->flags
& (IP6T_RT_RES
|IP6T_RT_FST_MASK
)) &&
204 (!(rtinfo
->flags
& IP6T_RT_TYP
) ||
205 (rtinfo
->rt_type
!= 0) ||
206 (rtinfo
->invflags
& IP6T_RT_INV_TYP
)) ) {
207 DEBUGP("`--rt-type 0' required before `--rt-0-*'");
214 static struct ip6t_match rt_match
= {
217 .checkentry
= &checkentry
,
221 static int __init
init(void)
223 return ip6t_register_match(&rt_match
);
226 static void __exit
cleanup(void)
228 ip6t_unregister_match(&rt_match
);
232 module_exit(cleanup
);
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