1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3  *	inet6 interface/address list definitions
4  *	Linux INET6 implementation
5  *
6  *	Authors:
7  *	Pedro Roque		<roque@di.fc.ul.pt>
8  */
9 
10 #ifndef _NET_IF_INET6_H
11 #define _NET_IF_INET6_H
12 
13 #include <net/snmp.h>
14 #include <linux/ipv6.h>
15 #include <linux/refcount.h>
16 
17 /* inet6_dev.if_flags */
18 
19 #define IF_RA_OTHERCONF	0x80
20 #define IF_RA_MANAGED	0x40
21 #define IF_RA_RCVD	0x20
22 #define IF_RS_SENT	0x10
23 #define IF_READY	0x80000000
24 
25 /* prefix flags */
26 #define IF_PREFIX_ONLINK	0x01
27 #define IF_PREFIX_AUTOCONF	0x02
28 
29 enum {
30 	INET6_IFADDR_STATE_PREDAD,
31 	INET6_IFADDR_STATE_DAD,
32 	INET6_IFADDR_STATE_POSTDAD,
33 	INET6_IFADDR_STATE_ERRDAD,
34 	INET6_IFADDR_STATE_DEAD,
35 };
36 
37 struct inet6_ifaddr {
38 	struct in6_addr		addr;
39 	__u32			prefix_len;
40 	__u32			rt_priority;
41 
42 	/* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
43 	__u32			valid_lft;
44 	__u32			prefered_lft;
45 	refcount_t		refcnt;
46 	spinlock_t		lock;
47 
48 	int			state;
49 
50 	__u32			flags;
51 	__u8			dad_probes;
52 	__u8			stable_privacy_retry;
53 
54 	__u16			scope;
55 	__u64			dad_nonce;
56 
57 	unsigned long		cstamp;	/* created timestamp */
58 	unsigned long		tstamp; /* updated timestamp */
59 
60 	struct delayed_work	dad_work;
61 
62 	struct inet6_dev	*idev;
63 	struct fib6_info	*rt;
64 
65 	struct hlist_node	addr_lst;
66 	struct list_head	if_list;
67 
68 	struct list_head	tmp_list;
69 	struct inet6_ifaddr	*ifpub;
70 	int			regen_count;
71 
72 	bool			tokenized;
73 
74 	struct rcu_head		rcu;
75 	struct in6_addr		peer_addr;
76 };
77 
78 struct ip6_sf_socklist {
79 	unsigned int		sl_max;
80 	unsigned int		sl_count;
81 	struct rcu_head		rcu;
82 	struct in6_addr		sl_addr[];
83 };
84 
85 #define IP6_SFBLOCK	10	/* allocate this many at once */
86 
87 struct ipv6_mc_socklist {
88 	struct in6_addr		addr;
89 	int			ifindex;
90 	unsigned int		sfmode;		/* MCAST_{INCLUDE,EXCLUDE} */
91 	struct ipv6_mc_socklist __rcu *next;
92 	struct ip6_sf_socklist	__rcu *sflist;
93 	struct rcu_head		rcu;
94 };
95 
96 struct ip6_sf_list {
97 	struct ip6_sf_list __rcu *sf_next;
98 	struct in6_addr		sf_addr;
99 	unsigned long		sf_count[2];	/* include/exclude counts */
100 	unsigned char		sf_gsresp;	/* include in g & s response? */
101 	unsigned char		sf_oldin;	/* change state */
102 	unsigned char		sf_crcount;	/* retrans. left to send */
103 	struct rcu_head		rcu;
104 };
105 
106 #define MAF_TIMER_RUNNING	0x01
107 #define MAF_LAST_REPORTER	0x02
108 #define MAF_LOADED		0x04
109 #define MAF_NOREPORT		0x08
110 #define MAF_GSQUERY		0x10
111 
112 struct ifmcaddr6 {
113 	struct in6_addr		mca_addr;
114 	struct inet6_dev	*idev;
115 	struct ifmcaddr6	__rcu *next;
116 	struct ip6_sf_list	__rcu *mca_sources;
117 	struct ip6_sf_list	__rcu *mca_tomb;
118 	unsigned int		mca_sfmode;
119 	unsigned char		mca_crcount;
120 	unsigned long		mca_sfcount[2];
121 	struct delayed_work	mca_work;
122 	unsigned int		mca_flags;
123 	int			mca_users;
124 	refcount_t		mca_refcnt;
125 	unsigned long		mca_cstamp;
126 	unsigned long		mca_tstamp;
127 	struct rcu_head		rcu;
128 };
129 
130 /* Anycast stuff */
131 
132 struct ipv6_ac_socklist {
133 	struct in6_addr		acl_addr;
134 	int			acl_ifindex;
135 	struct ipv6_ac_socklist *acl_next;
136 };
137 
138 struct ifacaddr6 {
139 	struct in6_addr		aca_addr;
140 	struct fib6_info	*aca_rt;
141 	struct ifacaddr6	*aca_next;
142 	struct hlist_node	aca_addr_lst;
143 	int			aca_users;
144 	refcount_t		aca_refcnt;
145 	unsigned long		aca_cstamp;
146 	unsigned long		aca_tstamp;
147 	struct rcu_head		rcu;
148 };
149 
150 #define	IFA_HOST	IPV6_ADDR_LOOPBACK
151 #define	IFA_LINK	IPV6_ADDR_LINKLOCAL
152 #define	IFA_SITE	IPV6_ADDR_SITELOCAL
153 
154 struct ipv6_devstat {
155 	struct proc_dir_entry	*proc_dir_entry;
156 	DEFINE_SNMP_STAT(struct ipstats_mib, ipv6);
157 	DEFINE_SNMP_STAT_ATOMIC(struct icmpv6_mib_device, icmpv6dev);
158 	DEFINE_SNMP_STAT_ATOMIC(struct icmpv6msg_mib_device, icmpv6msgdev);
159 };
160 
161 struct inet6_dev {
162 	struct net_device	*dev;
163 
164 	struct list_head	addr_list;
165 
166 	struct ifmcaddr6	__rcu *mc_list;
167 	struct ifmcaddr6	__rcu *mc_tomb;
168 
169 	unsigned char		mc_qrv;		/* Query Robustness Variable */
170 	unsigned char		mc_gq_running;
171 	unsigned char		mc_ifc_count;
172 	unsigned char		mc_dad_count;
173 
174 	unsigned long		mc_v1_seen;	/* Max time we stay in MLDv1 mode */
175 	unsigned long		mc_qi;		/* Query Interval */
176 	unsigned long		mc_qri;		/* Query Response Interval */
177 	unsigned long		mc_maxdelay;
178 
179 	struct delayed_work	mc_gq_work;	/* general query work */
180 	struct delayed_work	mc_ifc_work;	/* interface change work */
181 	struct delayed_work	mc_dad_work;	/* dad complete mc work */
182 	struct delayed_work	mc_query_work;	/* mld query work */
183 	struct delayed_work	mc_report_work;	/* mld report work */
184 
185 	struct sk_buff_head	mc_query_queue;		/* mld query queue */
186 	struct sk_buff_head	mc_report_queue;	/* mld report queue */
187 
188 	spinlock_t		mc_query_lock;	/* mld query queue lock */
189 	spinlock_t		mc_report_lock;	/* mld query report lock */
190 	struct mutex		mc_lock;	/* mld global lock */
191 
192 	struct ifacaddr6	*ac_list;
193 	rwlock_t		lock;
194 	refcount_t		refcnt;
195 	__u32			if_flags;
196 	int			dead;
197 
198 	u32			desync_factor;
199 	struct list_head	tempaddr_list;
200 
201 	struct in6_addr		token;
202 
203 	struct neigh_parms	*nd_parms;
204 	struct ipv6_devconf	cnf;
205 	struct ipv6_devstat	stats;
206 
207 	struct timer_list	rs_timer;
208 	__s32			rs_interval;	/* in jiffies */
209 	__u8			rs_probes;
210 
211 	unsigned long		tstamp; /* ipv6InterfaceTable update timestamp */
212 	struct rcu_head		rcu;
213 
214 	unsigned int		ra_mtu;
215 };
216 
ipv6_eth_mc_map(const struct in6_addr * addr,char * buf)217 static inline void ipv6_eth_mc_map(const struct in6_addr *addr, char *buf)
218 {
219 	/*
220 	 *	+-------+-------+-------+-------+-------+-------+
221 	 *      |   33  |   33  | DST13 | DST14 | DST15 | DST16 |
222 	 *      +-------+-------+-------+-------+-------+-------+
223 	 */
224 
225 	buf[0]= 0x33;
226 	buf[1]= 0x33;
227 
228 	memcpy(buf + 2, &addr->s6_addr32[3], sizeof(__u32));
229 }
230 
ipv6_arcnet_mc_map(const struct in6_addr * addr,char * buf)231 static inline void ipv6_arcnet_mc_map(const struct in6_addr *addr, char *buf)
232 {
233 	buf[0] = 0x00;
234 }
235 
ipv6_ib_mc_map(const struct in6_addr * addr,const unsigned char * broadcast,char * buf)236 static inline void ipv6_ib_mc_map(const struct in6_addr *addr,
237 				  const unsigned char *broadcast, char *buf)
238 {
239 	unsigned char scope = broadcast[5] & 0xF;
240 
241 	buf[0]  = 0;		/* Reserved */
242 	buf[1]  = 0xff;		/* Multicast QPN */
243 	buf[2]  = 0xff;
244 	buf[3]  = 0xff;
245 	buf[4]  = 0xff;
246 	buf[5]  = 0x10 | scope;	/* scope from broadcast address */
247 	buf[6]  = 0x60;		/* IPv6 signature */
248 	buf[7]  = 0x1b;
249 	buf[8]  = broadcast[8];	/* P_Key */
250 	buf[9]  = broadcast[9];
251 	memcpy(buf + 10, addr->s6_addr + 6, 10);
252 }
253 
ipv6_ipgre_mc_map(const struct in6_addr * addr,const unsigned char * broadcast,char * buf)254 static inline int ipv6_ipgre_mc_map(const struct in6_addr *addr,
255 				    const unsigned char *broadcast, char *buf)
256 {
257 	if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) {
258 		memcpy(buf, broadcast, 4);
259 	} else {
260 		/* v4mapped? */
261 		if ((addr->s6_addr32[0] | addr->s6_addr32[1] |
262 		     (addr->s6_addr32[2] ^ htonl(0x0000ffff))) != 0)
263 			return -EINVAL;
264 		memcpy(buf, &addr->s6_addr32[3], 4);
265 	}
266 	return 0;
267 }
268 
269 #endif
270