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 enum {
34 	INET6_IFADDR_STATE_DAD,
35 	INET6_IFADDR_STATE_POSTDAD,
36 	INET6_IFADDR_STATE_UP,
37 	INET6_IFADDR_STATE_DEAD,
38 };
39 
40 struct inet6_ifaddr {
41 	struct in6_addr		addr;
42 	__u32			prefix_len;
43 
44 	/* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
45 	__u32			valid_lft;
46 	__u32			prefered_lft;
47 	atomic_t		refcnt;
48 	spinlock_t		lock;
49 	spinlock_t		state_lock;
50 
51 	int			state;
52 
53 	__u8			probes;
54 	__u8			flags;
55 
56 	__u16			scope;
57 
58 	unsigned long		cstamp;	/* created timestamp */
59 	unsigned long		tstamp; /* updated timestamp */
60 
61 	struct timer_list	timer;
62 
63 	struct inet6_dev	*idev;
64 	struct rt6_info		*rt;
65 
66 	struct hlist_node	addr_lst;
67 	struct list_head	if_list;
68 
69 #ifdef CONFIG_IPV6_PRIVACY
70 	struct list_head	tmp_list;
71 	struct inet6_ifaddr	*ifpub;
72 	int			regen_count;
73 #endif
74 	struct rcu_head		rcu;
75 };
76 
77 struct ip6_sf_socklist {
78 	unsigned int		sl_max;
79 	unsigned int		sl_count;
80 	struct in6_addr		sl_addr[0];
81 };
82 
83 #define IP6_SFLSIZE(count)	(sizeof(struct ip6_sf_socklist) + \
84 	(count) * sizeof(struct in6_addr))
85 
86 #define IP6_SFBLOCK	10	/* allocate this many at once */
87 
88 struct ipv6_mc_socklist {
89 	struct in6_addr		addr;
90 	int			ifindex;
91 	struct ipv6_mc_socklist __rcu *next;
92 	rwlock_t		sflock;
93 	unsigned int		sfmode;		/* MCAST_{INCLUDE,EXCLUDE} */
94 	struct ip6_sf_socklist	*sflist;
95 	struct rcu_head		rcu;
96 };
97 
98 struct ip6_sf_list {
99 	struct ip6_sf_list	*sf_next;
100 	struct in6_addr		sf_addr;
101 	unsigned long		sf_count[2];	/* include/exclude counts */
102 	unsigned char		sf_gsresp;	/* include in g & s response? */
103 	unsigned char		sf_oldin;	/* change state */
104 	unsigned char		sf_crcount;	/* retrans. left to send */
105 };
106 
107 #define MAF_TIMER_RUNNING	0x01
108 #define MAF_LAST_REPORTER	0x02
109 #define MAF_LOADED		0x04
110 #define MAF_NOREPORT		0x08
111 #define MAF_GSQUERY		0x10
112 
113 struct ifmcaddr6 {
114 	struct in6_addr		mca_addr;
115 	struct inet6_dev	*idev;
116 	struct ifmcaddr6	*next;
117 	struct ip6_sf_list	*mca_sources;
118 	struct ip6_sf_list	*mca_tomb;
119 	unsigned int		mca_sfmode;
120 	unsigned char		mca_crcount;
121 	unsigned long		mca_sfcount[2];
122 	struct timer_list	mca_timer;
123 	unsigned		mca_flags;
124 	int			mca_users;
125 	atomic_t		mca_refcnt;
126 	spinlock_t		mca_lock;
127 	unsigned long		mca_cstamp;
128 	unsigned long		mca_tstamp;
129 };
130 
131 /* Anycast stuff */
132 
133 struct ipv6_ac_socklist {
134 	struct in6_addr		acl_addr;
135 	int			acl_ifindex;
136 	struct ipv6_ac_socklist *acl_next;
137 };
138 
139 struct ifacaddr6 {
140 	struct in6_addr		aca_addr;
141 	struct inet6_dev	*aca_idev;
142 	struct rt6_info		*aca_rt;
143 	struct ifacaddr6	*aca_next;
144 	int			aca_users;
145 	atomic_t		aca_refcnt;
146 	spinlock_t		aca_lock;
147 	unsigned long		aca_cstamp;
148 	unsigned long		aca_tstamp;
149 };
150 
151 #define	IFA_HOST	IPV6_ADDR_LOOPBACK
152 #define	IFA_LINK	IPV6_ADDR_LINKLOCAL
153 #define	IFA_SITE	IPV6_ADDR_SITELOCAL
154 
155 struct ipv6_devstat {
156 	struct proc_dir_entry	*proc_dir_entry;
157 	DEFINE_SNMP_STAT(struct ipstats_mib, ipv6);
158 	DEFINE_SNMP_STAT_ATOMIC(struct icmpv6_mib_device, icmpv6dev);
159 	DEFINE_SNMP_STAT_ATOMIC(struct icmpv6msg_mib_device, icmpv6msgdev);
160 };
161 
162 struct inet6_dev {
163 	struct net_device	*dev;
164 
165 	struct list_head	addr_list;
166 
167 	struct ifmcaddr6	*mc_list;
168 	struct ifmcaddr6	*mc_tomb;
169 	spinlock_t		mc_lock;
170 	unsigned char		mc_qrv;
171 	unsigned char		mc_gq_running;
172 	unsigned char		mc_ifc_count;
173 	unsigned long		mc_v1_seen;
174 	unsigned long		mc_maxdelay;
175 	struct timer_list	mc_gq_timer;	/* general query timer */
176 	struct timer_list	mc_ifc_timer;	/* interface change timer */
177 
178 	struct ifacaddr6	*ac_list;
179 	rwlock_t		lock;
180 	atomic_t		refcnt;
181 	__u32			if_flags;
182 	int			dead;
183 
184 #ifdef CONFIG_IPV6_PRIVACY
185 	u8			rndid[8];
186 	struct timer_list	regen_timer;
187 	struct list_head	tempaddr_list;
188 #endif
189 
190 	struct neigh_parms	*nd_parms;
191 	struct inet6_dev	*next;
192 	struct ipv6_devconf	cnf;
193 	struct ipv6_devstat	stats;
194 	unsigned long		tstamp; /* ipv6InterfaceTable update timestamp */
195 	struct rcu_head		rcu;
196 };
197 
ipv6_eth_mc_map(const struct in6_addr * addr,char * buf)198 static inline void ipv6_eth_mc_map(const struct in6_addr *addr, char *buf)
199 {
200 	/*
201 	 *	+-------+-------+-------+-------+-------+-------+
202 	 *      |   33  |   33  | DST13 | DST14 | DST15 | DST16 |
203 	 *      +-------+-------+-------+-------+-------+-------+
204 	 */
205 
206 	buf[0]= 0x33;
207 	buf[1]= 0x33;
208 
209 	memcpy(buf + 2, &addr->s6_addr32[3], sizeof(__u32));
210 }
211 
ipv6_tr_mc_map(const struct in6_addr * addr,char * buf)212 static inline void ipv6_tr_mc_map(const struct in6_addr *addr, char *buf)
213 {
214 	/* All nodes FF01::1, FF02::1, FF02::1:FFxx:xxxx */
215 
216 	if (((addr->s6_addr[0] == 0xFF) &&
217 	    ((addr->s6_addr[1] == 0x01) || (addr->s6_addr[1] == 0x02)) &&
218 	     (addr->s6_addr16[1] == 0) &&
219 	     (addr->s6_addr32[1] == 0) &&
220 	     (addr->s6_addr32[2] == 0) &&
221 	     (addr->s6_addr16[6] == 0) &&
222 	     (addr->s6_addr[15] == 1)) ||
223 	    ((addr->s6_addr[0] == 0xFF) &&
224 	     (addr->s6_addr[1] == 0x02) &&
225 	     (addr->s6_addr16[1] == 0) &&
226 	     (addr->s6_addr32[1] == 0) &&
227 	     (addr->s6_addr16[4] == 0) &&
228 	     (addr->s6_addr[10] == 0) &&
229 	     (addr->s6_addr[11] == 1) &&
230 	     (addr->s6_addr[12] == 0xff)))
231 	{
232 		buf[0]=0xC0;
233 		buf[1]=0x00;
234 		buf[2]=0x01;
235 		buf[3]=0x00;
236 		buf[4]=0x00;
237 		buf[5]=0x00;
238 	/* All routers FF0x::2 */
239 	} else if ((addr->s6_addr[0] ==0xff) &&
240 		((addr->s6_addr[1] & 0xF0) == 0) &&
241 		(addr->s6_addr16[1] == 0) &&
242 		(addr->s6_addr32[1] == 0) &&
243 		(addr->s6_addr32[2] == 0) &&
244 		(addr->s6_addr16[6] == 0) &&
245 		(addr->s6_addr[15] == 2))
246 	{
247 		buf[0]=0xC0;
248 		buf[1]=0x00;
249 		buf[2]=0x02;
250 		buf[3]=0x00;
251 		buf[4]=0x00;
252 		buf[5]=0x00;
253 	} else {
254 		unsigned char i ;
255 
256 		i = addr->s6_addr[15] & 7 ;
257 		buf[0]=0xC0;
258 		buf[1]=0x00;
259 		buf[2]=0x00;
260 		buf[3]=0x01 << i ;
261 		buf[4]=0x00;
262 		buf[5]=0x00;
263 	}
264 }
265 
ipv6_arcnet_mc_map(const struct in6_addr * addr,char * buf)266 static inline void ipv6_arcnet_mc_map(const struct in6_addr *addr, char *buf)
267 {
268 	buf[0] = 0x00;
269 }
270 
ipv6_ib_mc_map(const struct in6_addr * addr,const unsigned char * broadcast,char * buf)271 static inline void ipv6_ib_mc_map(const struct in6_addr *addr,
272 				  const unsigned char *broadcast, char *buf)
273 {
274 	unsigned char scope = broadcast[5] & 0xF;
275 
276 	buf[0]  = 0;		/* Reserved */
277 	buf[1]  = 0xff;		/* Multicast QPN */
278 	buf[2]  = 0xff;
279 	buf[3]  = 0xff;
280 	buf[4]  = 0xff;
281 	buf[5]  = 0x10 | scope;	/* scope from broadcast address */
282 	buf[6]  = 0x60;		/* IPv6 signature */
283 	buf[7]  = 0x1b;
284 	buf[8]  = broadcast[8];	/* P_Key */
285 	buf[9]  = broadcast[9];
286 	memcpy(buf + 10, addr->s6_addr + 6, 10);
287 }
288 
ipv6_ipgre_mc_map(const struct in6_addr * addr,const unsigned char * broadcast,char * buf)289 static inline int ipv6_ipgre_mc_map(const struct in6_addr *addr,
290 				    const unsigned char *broadcast, char *buf)
291 {
292 	if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) {
293 		memcpy(buf, broadcast, 4);
294 	} else {
295 		/* v4mapped? */
296 		if ((addr->s6_addr32[0] | addr->s6_addr32[1] |
297 		     (addr->s6_addr32[2] ^ htonl(0x0000ffff))) != 0)
298 			return -EINVAL;
299 		memcpy(buf, &addr->s6_addr32[3], 4);
300 	}
301 	return 0;
302 }
303 
304 #endif
305