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 	 * Used to safely traverse idev->addr_list in process context
69 	 * if the idev->lock needed to protect idev->addr_list cannot be held.
70 	 * In that case, add the items to this list temporarily and iterate
71 	 * without holding idev->lock.
72 	 * See addrconf_ifdown and dev_forward_change.
73 	 */
74 	struct list_head	if_list_aux;
75 
76 	struct list_head	tmp_list;
77 	struct inet6_ifaddr	*ifpub;
78 	int			regen_count;
79 
80 	bool			tokenized;
81 
82 	u8			ifa_proto;
83 
84 	struct rcu_head		rcu;
85 	struct in6_addr		peer_addr;
86 };
87 
88 struct ip6_sf_socklist {
89 	unsigned int		sl_max;
90 	unsigned int		sl_count;
91 	struct rcu_head		rcu;
92 	struct in6_addr		sl_addr[];
93 };
94 
95 #define IP6_SFBLOCK	10	/* allocate this many at once */
96 
97 struct ipv6_mc_socklist {
98 	struct in6_addr		addr;
99 	int			ifindex;
100 	unsigned int		sfmode;		/* MCAST_{INCLUDE,EXCLUDE} */
101 	struct ipv6_mc_socklist __rcu *next;
102 	struct ip6_sf_socklist	__rcu *sflist;
103 	struct rcu_head		rcu;
104 };
105 
106 struct ip6_sf_list {
107 	struct ip6_sf_list __rcu *sf_next;
108 	struct in6_addr		sf_addr;
109 	unsigned long		sf_count[2];	/* include/exclude counts */
110 	unsigned char		sf_gsresp;	/* include in g & s response? */
111 	unsigned char		sf_oldin;	/* change state */
112 	unsigned char		sf_crcount;	/* retrans. left to send */
113 	struct rcu_head		rcu;
114 };
115 
116 #define MAF_TIMER_RUNNING	0x01
117 #define MAF_LAST_REPORTER	0x02
118 #define MAF_LOADED		0x04
119 #define MAF_NOREPORT		0x08
120 #define MAF_GSQUERY		0x10
121 
122 struct ifmcaddr6 {
123 	struct in6_addr		mca_addr;
124 	struct inet6_dev	*idev;
125 	struct ifmcaddr6	__rcu *next;
126 	struct ip6_sf_list	__rcu *mca_sources;
127 	struct ip6_sf_list	__rcu *mca_tomb;
128 	unsigned int		mca_sfmode;
129 	unsigned char		mca_crcount;
130 	unsigned long		mca_sfcount[2];
131 	struct delayed_work	mca_work;
132 	unsigned int		mca_flags;
133 	int			mca_users;
134 	refcount_t		mca_refcnt;
135 	unsigned long		mca_cstamp;
136 	unsigned long		mca_tstamp;
137 	struct rcu_head		rcu;
138 };
139 
140 /* Anycast stuff */
141 
142 struct ipv6_ac_socklist {
143 	struct in6_addr		acl_addr;
144 	int			acl_ifindex;
145 	struct ipv6_ac_socklist *acl_next;
146 };
147 
148 struct ifacaddr6 {
149 	struct in6_addr		aca_addr;
150 	struct fib6_info	*aca_rt;
151 	struct ifacaddr6	*aca_next;
152 	struct hlist_node	aca_addr_lst;
153 	int			aca_users;
154 	refcount_t		aca_refcnt;
155 	unsigned long		aca_cstamp;
156 	unsigned long		aca_tstamp;
157 	struct rcu_head		rcu;
158 };
159 
160 #define	IFA_HOST	IPV6_ADDR_LOOPBACK
161 #define	IFA_LINK	IPV6_ADDR_LINKLOCAL
162 #define	IFA_SITE	IPV6_ADDR_SITELOCAL
163 
164 struct ipv6_devstat {
165 	struct proc_dir_entry	*proc_dir_entry;
166 	DEFINE_SNMP_STAT(struct ipstats_mib, ipv6);
167 	DEFINE_SNMP_STAT_ATOMIC(struct icmpv6_mib_device, icmpv6dev);
168 	DEFINE_SNMP_STAT_ATOMIC(struct icmpv6msg_mib_device, icmpv6msgdev);
169 };
170 
171 struct inet6_dev {
172 	struct net_device	*dev;
173 	netdevice_tracker	dev_tracker;
174 
175 	struct list_head	addr_list;
176 
177 	struct ifmcaddr6	__rcu *mc_list;
178 	struct ifmcaddr6	__rcu *mc_tomb;
179 
180 	unsigned char		mc_qrv;		/* Query Robustness Variable */
181 	unsigned char		mc_gq_running;
182 	unsigned char		mc_ifc_count;
183 	unsigned char		mc_dad_count;
184 
185 	unsigned long		mc_v1_seen;	/* Max time we stay in MLDv1 mode */
186 	unsigned long		mc_qi;		/* Query Interval */
187 	unsigned long		mc_qri;		/* Query Response Interval */
188 	unsigned long		mc_maxdelay;
189 
190 	struct delayed_work	mc_gq_work;	/* general query work */
191 	struct delayed_work	mc_ifc_work;	/* interface change work */
192 	struct delayed_work	mc_dad_work;	/* dad complete mc work */
193 	struct delayed_work	mc_query_work;	/* mld query work */
194 	struct delayed_work	mc_report_work;	/* mld report work */
195 
196 	struct sk_buff_head	mc_query_queue;		/* mld query queue */
197 	struct sk_buff_head	mc_report_queue;	/* mld report queue */
198 
199 	spinlock_t		mc_query_lock;	/* mld query queue lock */
200 	spinlock_t		mc_report_lock;	/* mld query report lock */
201 	struct mutex		mc_lock;	/* mld global lock */
202 
203 	struct ifacaddr6	*ac_list;
204 	rwlock_t		lock;
205 	refcount_t		refcnt;
206 	__u32			if_flags;
207 	int			dead;
208 
209 	u32			desync_factor;
210 	struct list_head	tempaddr_list;
211 
212 	struct in6_addr		token;
213 
214 	struct neigh_parms	*nd_parms;
215 	struct ipv6_devconf	cnf;
216 	struct ipv6_devstat	stats;
217 
218 	struct timer_list	rs_timer;
219 	__s32			rs_interval;	/* in jiffies */
220 	__u8			rs_probes;
221 
222 	unsigned long		tstamp; /* ipv6InterfaceTable update timestamp */
223 	struct rcu_head		rcu;
224 
225 	unsigned int		ra_mtu;
226 };
227 
ipv6_eth_mc_map(const struct in6_addr * addr,char * buf)228 static inline void ipv6_eth_mc_map(const struct in6_addr *addr, char *buf)
229 {
230 	/*
231 	 *	+-------+-------+-------+-------+-------+-------+
232 	 *      |   33  |   33  | DST13 | DST14 | DST15 | DST16 |
233 	 *      +-------+-------+-------+-------+-------+-------+
234 	 */
235 
236 	buf[0]= 0x33;
237 	buf[1]= 0x33;
238 
239 	memcpy(buf + 2, &addr->s6_addr32[3], sizeof(__u32));
240 }
241 
ipv6_arcnet_mc_map(const struct in6_addr * addr,char * buf)242 static inline void ipv6_arcnet_mc_map(const struct in6_addr *addr, char *buf)
243 {
244 	buf[0] = 0x00;
245 }
246 
ipv6_ib_mc_map(const struct in6_addr * addr,const unsigned char * broadcast,char * buf)247 static inline void ipv6_ib_mc_map(const struct in6_addr *addr,
248 				  const unsigned char *broadcast, char *buf)
249 {
250 	unsigned char scope = broadcast[5] & 0xF;
251 
252 	buf[0]  = 0;		/* Reserved */
253 	buf[1]  = 0xff;		/* Multicast QPN */
254 	buf[2]  = 0xff;
255 	buf[3]  = 0xff;
256 	buf[4]  = 0xff;
257 	buf[5]  = 0x10 | scope;	/* scope from broadcast address */
258 	buf[6]  = 0x60;		/* IPv6 signature */
259 	buf[7]  = 0x1b;
260 	buf[8]  = broadcast[8];	/* P_Key */
261 	buf[9]  = broadcast[9];
262 	memcpy(buf + 10, addr->s6_addr + 6, 10);
263 }
264 
ipv6_ipgre_mc_map(const struct in6_addr * addr,const unsigned char * broadcast,char * buf)265 static inline int ipv6_ipgre_mc_map(const struct in6_addr *addr,
266 				    const unsigned char *broadcast, char *buf)
267 {
268 	if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) {
269 		memcpy(buf, broadcast, 4);
270 	} else {
271 		/* v4mapped? */
272 		if ((addr->s6_addr32[0] | addr->s6_addr32[1] |
273 		     (addr->s6_addr32[2] ^ htonl(0x0000ffff))) != 0)
274 			return -EINVAL;
275 		memcpy(buf, &addr->s6_addr32[3], 4);
276 	}
277 	return 0;
278 }
279 
280 #endif
281