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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 	bool			tokenized;
75 
76 	struct rcu_head		rcu;
77 };
78 
79 struct ip6_sf_socklist {
80 	unsigned int		sl_max;
81 	unsigned int		sl_count;
82 	struct in6_addr		sl_addr[0];
83 };
84 
85 #define IP6_SFLSIZE(count)	(sizeof(struct ip6_sf_socklist) + \
86 	(count) * sizeof(struct in6_addr))
87 
88 #define IP6_SFBLOCK	10	/* allocate this many at once */
89 
90 struct ipv6_mc_socklist {
91 	struct in6_addr		addr;
92 	int			ifindex;
93 	struct ipv6_mc_socklist __rcu *next;
94 	rwlock_t		sflock;
95 	unsigned int		sfmode;		/* MCAST_{INCLUDE,EXCLUDE} */
96 	struct ip6_sf_socklist	*sflist;
97 	struct rcu_head		rcu;
98 };
99 
100 struct ip6_sf_list {
101 	struct ip6_sf_list	*sf_next;
102 	struct in6_addr		sf_addr;
103 	unsigned long		sf_count[2];	/* include/exclude counts */
104 	unsigned char		sf_gsresp;	/* include in g & s response? */
105 	unsigned char		sf_oldin;	/* change state */
106 	unsigned char		sf_crcount;	/* retrans. left to send */
107 };
108 
109 #define MAF_TIMER_RUNNING	0x01
110 #define MAF_LAST_REPORTER	0x02
111 #define MAF_LOADED		0x04
112 #define MAF_NOREPORT		0x08
113 #define MAF_GSQUERY		0x10
114 
115 struct ifmcaddr6 {
116 	struct in6_addr		mca_addr;
117 	struct inet6_dev	*idev;
118 	struct ifmcaddr6	*next;
119 	struct ip6_sf_list	*mca_sources;
120 	struct ip6_sf_list	*mca_tomb;
121 	unsigned int		mca_sfmode;
122 	unsigned char		mca_crcount;
123 	unsigned long		mca_sfcount[2];
124 	struct timer_list	mca_timer;
125 	unsigned int		mca_flags;
126 	int			mca_users;
127 	atomic_t		mca_refcnt;
128 	spinlock_t		mca_lock;
129 	unsigned long		mca_cstamp;
130 	unsigned long		mca_tstamp;
131 };
132 
133 /* Anycast stuff */
134 
135 struct ipv6_ac_socklist {
136 	struct in6_addr		acl_addr;
137 	int			acl_ifindex;
138 	struct ipv6_ac_socklist *acl_next;
139 };
140 
141 struct ifacaddr6 {
142 	struct in6_addr		aca_addr;
143 	struct inet6_dev	*aca_idev;
144 	struct rt6_info		*aca_rt;
145 	struct ifacaddr6	*aca_next;
146 	int			aca_users;
147 	atomic_t		aca_refcnt;
148 	spinlock_t		aca_lock;
149 	unsigned long		aca_cstamp;
150 	unsigned long		aca_tstamp;
151 };
152 
153 #define	IFA_HOST	IPV6_ADDR_LOOPBACK
154 #define	IFA_LINK	IPV6_ADDR_LINKLOCAL
155 #define	IFA_SITE	IPV6_ADDR_SITELOCAL
156 
157 struct ipv6_devstat {
158 	struct proc_dir_entry	*proc_dir_entry;
159 	DEFINE_SNMP_STAT(struct ipstats_mib, ipv6);
160 	DEFINE_SNMP_STAT_ATOMIC(struct icmpv6_mib_device, icmpv6dev);
161 	DEFINE_SNMP_STAT_ATOMIC(struct icmpv6msg_mib_device, icmpv6msgdev);
162 };
163 
164 struct inet6_dev {
165 	struct net_device	*dev;
166 
167 	struct list_head	addr_list;
168 
169 	struct ifmcaddr6	*mc_list;
170 	struct ifmcaddr6	*mc_tomb;
171 	spinlock_t		mc_lock;
172 	unsigned char		mc_qrv;
173 	unsigned char		mc_gq_running;
174 	unsigned char		mc_ifc_count;
175 	unsigned long		mc_v1_seen;
176 	unsigned long		mc_maxdelay;
177 	struct timer_list	mc_gq_timer;	/* general query timer */
178 	struct timer_list	mc_ifc_timer;	/* interface change timer */
179 
180 	struct ifacaddr6	*ac_list;
181 	rwlock_t		lock;
182 	atomic_t		refcnt;
183 	__u32			if_flags;
184 	int			dead;
185 
186 #ifdef CONFIG_IPV6_PRIVACY
187 	u8			rndid[8];
188 	struct timer_list	regen_timer;
189 	struct list_head	tempaddr_list;
190 #endif
191 
192 	struct in6_addr		token;
193 
194 	struct neigh_parms	*nd_parms;
195 	struct inet6_dev	*next;
196 	struct ipv6_devconf	cnf;
197 	struct ipv6_devstat	stats;
198 
199 	__s32			rs_interval;	/* in jiffies */
200 
201 	unsigned long		tstamp; /* ipv6InterfaceTable update timestamp */
202 	struct rcu_head		rcu;
203 };
204 
ipv6_eth_mc_map(const struct in6_addr * addr,char * buf)205 static inline void ipv6_eth_mc_map(const struct in6_addr *addr, char *buf)
206 {
207 	/*
208 	 *	+-------+-------+-------+-------+-------+-------+
209 	 *      |   33  |   33  | DST13 | DST14 | DST15 | DST16 |
210 	 *      +-------+-------+-------+-------+-------+-------+
211 	 */
212 
213 	buf[0]= 0x33;
214 	buf[1]= 0x33;
215 
216 	memcpy(buf + 2, &addr->s6_addr32[3], sizeof(__u32));
217 }
218 
ipv6_arcnet_mc_map(const struct in6_addr * addr,char * buf)219 static inline void ipv6_arcnet_mc_map(const struct in6_addr *addr, char *buf)
220 {
221 	buf[0] = 0x00;
222 }
223 
ipv6_ib_mc_map(const struct in6_addr * addr,const unsigned char * broadcast,char * buf)224 static inline void ipv6_ib_mc_map(const struct in6_addr *addr,
225 				  const unsigned char *broadcast, char *buf)
226 {
227 	unsigned char scope = broadcast[5] & 0xF;
228 
229 	buf[0]  = 0;		/* Reserved */
230 	buf[1]  = 0xff;		/* Multicast QPN */
231 	buf[2]  = 0xff;
232 	buf[3]  = 0xff;
233 	buf[4]  = 0xff;
234 	buf[5]  = 0x10 | scope;	/* scope from broadcast address */
235 	buf[6]  = 0x60;		/* IPv6 signature */
236 	buf[7]  = 0x1b;
237 	buf[8]  = broadcast[8];	/* P_Key */
238 	buf[9]  = broadcast[9];
239 	memcpy(buf + 10, addr->s6_addr + 6, 10);
240 }
241 
ipv6_ipgre_mc_map(const struct in6_addr * addr,const unsigned char * broadcast,char * buf)242 static inline int ipv6_ipgre_mc_map(const struct in6_addr *addr,
243 				    const unsigned char *broadcast, char *buf)
244 {
245 	if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) {
246 		memcpy(buf, broadcast, 4);
247 	} else {
248 		/* v4mapped? */
249 		if ((addr->s6_addr32[0] | addr->s6_addr32[1] |
250 		     (addr->s6_addr32[2] ^ htonl(0x0000ffff))) != 0)
251 			return -EINVAL;
252 		memcpy(buf, &addr->s6_addr32[3], 4);
253 	}
254 	return 0;
255 }
256 
257 #endif
258