1 /*
2  *	inet6 interface/address list definitions
3  *	Linux INET6 implementation
4  *
5  *	Authors:
6  *	Pedro Roque		<roque@di.fc.ul.pt>
7  *
8  *
9  *	This program is free software; you can redistribute it and/or
10  *      modify it under the terms of the GNU General Public License
11  *      as published by the Free Software Foundation; either version
12  *      2 of the License, or (at your option) any later version.
13  */
14 
15 #ifndef _NET_IF_INET6_H
16 #define _NET_IF_INET6_H
17 
18 #include <net/snmp.h>
19 #include <linux/ipv6.h>
20 
21 /* inet6_dev.if_flags */
22 
23 #define IF_RA_OTHERCONF	0x80
24 #define IF_RA_MANAGED	0x40
25 #define IF_RA_RCVD	0x20
26 #define IF_RS_SENT	0x10
27 #define IF_READY	0x80000000
28 
29 /* prefix flags */
30 #define IF_PREFIX_ONLINK	0x01
31 #define IF_PREFIX_AUTOCONF	0x02
32 
33 #ifdef __KERNEL__
34 
35 enum {
36 	INET6_IFADDR_STATE_DAD,
37 	INET6_IFADDR_STATE_POSTDAD,
38 	INET6_IFADDR_STATE_UP,
39 	INET6_IFADDR_STATE_DEAD,
40 };
41 
42 struct inet6_ifaddr {
43 	struct in6_addr		addr;
44 	__u32			prefix_len;
45 
46 	__u32			valid_lft;
47 	__u32			prefered_lft;
48 	atomic_t		refcnt;
49 	spinlock_t		lock;
50 	spinlock_t		state_lock;
51 
52 	int			state;
53 
54 	__u8			probes;
55 	__u8			flags;
56 
57 	__u16			scope;
58 
59 	unsigned long		cstamp;	/* created timestamp */
60 	unsigned long		tstamp; /* updated timestamp */
61 
62 	struct timer_list	timer;
63 
64 	struct inet6_dev	*idev;
65 	struct rt6_info		*rt;
66 
67 	struct hlist_node	addr_lst;
68 	struct list_head	if_list;
69 
70 #ifdef CONFIG_IPV6_PRIVACY
71 	struct list_head	tmp_list;
72 	struct inet6_ifaddr	*ifpub;
73 	int			regen_count;
74 #endif
75 	struct rcu_head		rcu;
76 };
77 
78 struct ip6_sf_socklist {
79 	unsigned int		sl_max;
80 	unsigned int		sl_count;
81 	struct in6_addr		sl_addr[0];
82 };
83 
84 #define IP6_SFLSIZE(count)	(sizeof(struct ip6_sf_socklist) + \
85 	(count) * sizeof(struct in6_addr))
86 
87 #define IP6_SFBLOCK	10	/* allocate this many at once */
88 
89 struct ipv6_mc_socklist {
90 	struct in6_addr		addr;
91 	int			ifindex;
92 	struct ipv6_mc_socklist __rcu *next;
93 	rwlock_t		sflock;
94 	unsigned int		sfmode;		/* MCAST_{INCLUDE,EXCLUDE} */
95 	struct ip6_sf_socklist	*sflist;
96 	struct rcu_head		rcu;
97 };
98 
99 struct ip6_sf_list {
100 	struct ip6_sf_list	*sf_next;
101 	struct in6_addr		sf_addr;
102 	unsigned long		sf_count[2];	/* include/exclude counts */
103 	unsigned char		sf_gsresp;	/* include in g & s response? */
104 	unsigned char		sf_oldin;	/* change state */
105 	unsigned char		sf_crcount;	/* retrans. left to send */
106 };
107 
108 #define MAF_TIMER_RUNNING	0x01
109 #define MAF_LAST_REPORTER	0x02
110 #define MAF_LOADED		0x04
111 #define MAF_NOREPORT		0x08
112 #define MAF_GSQUERY		0x10
113 
114 struct ifmcaddr6 {
115 	struct in6_addr		mca_addr;
116 	struct inet6_dev	*idev;
117 	struct ifmcaddr6	*next;
118 	struct ip6_sf_list	*mca_sources;
119 	struct ip6_sf_list	*mca_tomb;
120 	unsigned int		mca_sfmode;
121 	unsigned char		mca_crcount;
122 	unsigned long		mca_sfcount[2];
123 	struct timer_list	mca_timer;
124 	unsigned		mca_flags;
125 	int			mca_users;
126 	atomic_t		mca_refcnt;
127 	spinlock_t		mca_lock;
128 	unsigned long		mca_cstamp;
129 	unsigned long		mca_tstamp;
130 };
131 
132 /* Anycast stuff */
133 
134 struct ipv6_ac_socklist {
135 	struct in6_addr		acl_addr;
136 	int			acl_ifindex;
137 	struct ipv6_ac_socklist *acl_next;
138 };
139 
140 struct ifacaddr6 {
141 	struct in6_addr		aca_addr;
142 	struct inet6_dev	*aca_idev;
143 	struct rt6_info		*aca_rt;
144 	struct ifacaddr6	*aca_next;
145 	int			aca_users;
146 	atomic_t		aca_refcnt;
147 	spinlock_t		aca_lock;
148 	unsigned long		aca_cstamp;
149 	unsigned long		aca_tstamp;
150 };
151 
152 #define	IFA_HOST	IPV6_ADDR_LOOPBACK
153 #define	IFA_LINK	IPV6_ADDR_LINKLOCAL
154 #define	IFA_SITE	IPV6_ADDR_SITELOCAL
155 
156 struct ipv6_devstat {
157 	struct proc_dir_entry	*proc_dir_entry;
158 	DEFINE_SNMP_STAT(struct ipstats_mib, ipv6);
159 	DEFINE_SNMP_STAT(struct icmpv6_mib, icmpv6);
160 	DEFINE_SNMP_STAT(struct icmpv6msg_mib, icmpv6msg);
161 };
162 
163 struct inet6_dev {
164 	struct net_device	*dev;
165 
166 	struct list_head	addr_list;
167 
168 	struct ifmcaddr6	*mc_list;
169 	struct ifmcaddr6	*mc_tomb;
170 	spinlock_t		mc_lock;
171 	unsigned char		mc_qrv;
172 	unsigned char		mc_gq_running;
173 	unsigned char		mc_ifc_count;
174 	unsigned long		mc_v1_seen;
175 	unsigned long		mc_maxdelay;
176 	struct timer_list	mc_gq_timer;	/* general query timer */
177 	struct timer_list	mc_ifc_timer;	/* interface change timer */
178 
179 	struct ifacaddr6	*ac_list;
180 	rwlock_t		lock;
181 	atomic_t		refcnt;
182 	__u32			if_flags;
183 	int			dead;
184 
185 #ifdef CONFIG_IPV6_PRIVACY
186 	u8			rndid[8];
187 	struct timer_list	regen_timer;
188 	struct list_head	tempaddr_list;
189 #endif
190 
191 	struct neigh_parms	*nd_parms;
192 	struct inet6_dev	*next;
193 	struct ipv6_devconf	cnf;
194 	struct ipv6_devstat	stats;
195 	unsigned long		tstamp; /* ipv6InterfaceTable update timestamp */
196 	struct rcu_head		rcu;
197 };
198 
ipv6_eth_mc_map(struct in6_addr * addr,char * buf)199 static inline void ipv6_eth_mc_map(struct in6_addr *addr, char *buf)
200 {
201 	/*
202 	 *	+-------+-------+-------+-------+-------+-------+
203 	 *      |   33  |   33  | DST13 | DST14 | DST15 | DST16 |
204 	 *      +-------+-------+-------+-------+-------+-------+
205 	 */
206 
207 	buf[0]= 0x33;
208 	buf[1]= 0x33;
209 
210 	memcpy(buf + 2, &addr->s6_addr32[3], sizeof(__u32));
211 }
212 
ipv6_tr_mc_map(struct in6_addr * addr,char * buf)213 static inline void ipv6_tr_mc_map(struct in6_addr *addr, char *buf)
214 {
215 	/* All nodes FF01::1, FF02::1, FF02::1:FFxx:xxxx */
216 
217 	if (((addr->s6_addr[0] == 0xFF) &&
218 	    ((addr->s6_addr[1] == 0x01) || (addr->s6_addr[1] == 0x02)) &&
219 	     (addr->s6_addr16[1] == 0) &&
220 	     (addr->s6_addr32[1] == 0) &&
221 	     (addr->s6_addr32[2] == 0) &&
222 	     (addr->s6_addr16[6] == 0) &&
223 	     (addr->s6_addr[15] == 1)) ||
224 	    ((addr->s6_addr[0] == 0xFF) &&
225 	     (addr->s6_addr[1] == 0x02) &&
226 	     (addr->s6_addr16[1] == 0) &&
227 	     (addr->s6_addr32[1] == 0) &&
228 	     (addr->s6_addr16[4] == 0) &&
229 	     (addr->s6_addr[10] == 0) &&
230 	     (addr->s6_addr[11] == 1) &&
231 	     (addr->s6_addr[12] == 0xff)))
232 	{
233 		buf[0]=0xC0;
234 		buf[1]=0x00;
235 		buf[2]=0x01;
236 		buf[3]=0x00;
237 		buf[4]=0x00;
238 		buf[5]=0x00;
239 	/* All routers FF0x::2 */
240 	} else if ((addr->s6_addr[0] ==0xff) &&
241 		((addr->s6_addr[1] & 0xF0) == 0) &&
242 		(addr->s6_addr16[1] == 0) &&
243 		(addr->s6_addr32[1] == 0) &&
244 		(addr->s6_addr32[2] == 0) &&
245 		(addr->s6_addr16[6] == 0) &&
246 		(addr->s6_addr[15] == 2))
247 	{
248 		buf[0]=0xC0;
249 		buf[1]=0x00;
250 		buf[2]=0x02;
251 		buf[3]=0x00;
252 		buf[4]=0x00;
253 		buf[5]=0x00;
254 	} else {
255 		unsigned char i ;
256 
257 		i = addr->s6_addr[15] & 7 ;
258 		buf[0]=0xC0;
259 		buf[1]=0x00;
260 		buf[2]=0x00;
261 		buf[3]=0x01 << i ;
262 		buf[4]=0x00;
263 		buf[5]=0x00;
264 	}
265 }
266 
ipv6_arcnet_mc_map(const struct in6_addr * addr,char * buf)267 static inline void ipv6_arcnet_mc_map(const struct in6_addr *addr, char *buf)
268 {
269 	buf[0] = 0x00;
270 }
271 
ipv6_ib_mc_map(const struct in6_addr * addr,const unsigned char * broadcast,char * buf)272 static inline void ipv6_ib_mc_map(const struct in6_addr *addr,
273 				  const unsigned char *broadcast, char *buf)
274 {
275 	unsigned char scope = broadcast[5] & 0xF;
276 
277 	buf[0]  = 0;		/* Reserved */
278 	buf[1]  = 0xff;		/* Multicast QPN */
279 	buf[2]  = 0xff;
280 	buf[3]  = 0xff;
281 	buf[4]  = 0xff;
282 	buf[5]  = 0x10 | scope;	/* scope from broadcast address */
283 	buf[6]  = 0x60;		/* IPv6 signature */
284 	buf[7]  = 0x1b;
285 	buf[8]  = broadcast[8];	/* P_Key */
286 	buf[9]  = broadcast[9];
287 	memcpy(buf + 10, addr->s6_addr + 6, 10);
288 }
289 
ipv6_ipgre_mc_map(const struct in6_addr * addr,const unsigned char * broadcast,char * buf)290 static inline int ipv6_ipgre_mc_map(const struct in6_addr *addr,
291 				    const unsigned char *broadcast, char *buf)
292 {
293 	if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) {
294 		memcpy(buf, broadcast, 4);
295 	} else {
296 		/* v4mapped? */
297 		if ((addr->s6_addr32[0] | addr->s6_addr32[1] |
298 		     (addr->s6_addr32[2] ^ htonl(0x0000ffff))) != 0)
299 			return -EINVAL;
300 		memcpy(buf, &addr->s6_addr32[3], 4);
301 	}
302 	return 0;
303 }
304 
305 #endif
306 #endif
307