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 enum {
26 	INET6_IFADDR_STATE_PREDAD,
27 	INET6_IFADDR_STATE_DAD,
28 	INET6_IFADDR_STATE_POSTDAD,
29 	INET6_IFADDR_STATE_ERRDAD,
30 	INET6_IFADDR_STATE_DEAD,
31 };
32 
33 struct inet6_ifaddr {
34 	struct in6_addr		addr;
35 	__u32			prefix_len;
36 	__u32			rt_priority;
37 
38 	/* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
39 	__u32			valid_lft;
40 	__u32			prefered_lft;
41 	refcount_t		refcnt;
42 	spinlock_t		lock;
43 
44 	int			state;
45 
46 	__u32			flags;
47 	__u8			dad_probes;
48 	__u8			stable_privacy_retry;
49 
50 	__u16			scope;
51 	__u64			dad_nonce;
52 
53 	unsigned long		cstamp;	/* created timestamp */
54 	unsigned long		tstamp; /* updated timestamp */
55 
56 	struct delayed_work	dad_work;
57 
58 	struct inet6_dev	*idev;
59 	struct fib6_info	*rt;
60 
61 	struct hlist_node	addr_lst;
62 	struct list_head	if_list;
63 	/*
64 	 * Used to safely traverse idev->addr_list in process context
65 	 * if the idev->lock needed to protect idev->addr_list cannot be held.
66 	 * In that case, add the items to this list temporarily and iterate
67 	 * without holding idev->lock.
68 	 * See addrconf_ifdown and dev_forward_change.
69 	 */
70 	struct list_head	if_list_aux;
71 
72 	struct list_head	tmp_list;
73 	struct inet6_ifaddr	*ifpub;
74 	int			regen_count;
75 
76 	bool			tokenized;
77 
78 	u8			ifa_proto;
79 
80 	struct rcu_head		rcu;
81 	struct in6_addr		peer_addr;
82 };
83 
84 struct ip6_sf_socklist {
85 	unsigned int		sl_max;
86 	unsigned int		sl_count;
87 	struct rcu_head		rcu;
88 	struct in6_addr		sl_addr[];
89 };
90 
91 #define IP6_SFBLOCK	10	/* allocate this many at once */
92 
93 struct ipv6_mc_socklist {
94 	struct in6_addr		addr;
95 	int			ifindex;
96 	unsigned int		sfmode;		/* MCAST_{INCLUDE,EXCLUDE} */
97 	struct ipv6_mc_socklist __rcu *next;
98 	struct ip6_sf_socklist	__rcu *sflist;
99 	struct rcu_head		rcu;
100 };
101 
102 struct ip6_sf_list {
103 	struct ip6_sf_list __rcu *sf_next;
104 	struct in6_addr		sf_addr;
105 	unsigned long		sf_count[2];	/* include/exclude counts */
106 	unsigned char		sf_gsresp;	/* include in g & s response? */
107 	unsigned char		sf_oldin;	/* change state */
108 	unsigned char		sf_crcount;	/* retrans. left to send */
109 	struct rcu_head		rcu;
110 };
111 
112 #define MAF_TIMER_RUNNING	0x01
113 #define MAF_LAST_REPORTER	0x02
114 #define MAF_LOADED		0x04
115 #define MAF_NOREPORT		0x08
116 #define MAF_GSQUERY		0x10
117 
118 struct ifmcaddr6 {
119 	struct in6_addr		mca_addr;
120 	struct inet6_dev	*idev;
121 	struct ifmcaddr6	__rcu *next;
122 	struct ip6_sf_list	__rcu *mca_sources;
123 	struct ip6_sf_list	__rcu *mca_tomb;
124 	unsigned int		mca_sfmode;
125 	unsigned char		mca_crcount;
126 	unsigned long		mca_sfcount[2];
127 	struct delayed_work	mca_work;
128 	unsigned int		mca_flags;
129 	int			mca_users;
130 	refcount_t		mca_refcnt;
131 	unsigned long		mca_cstamp;
132 	unsigned long		mca_tstamp;
133 	struct rcu_head		rcu;
134 };
135 
136 /* Anycast stuff */
137 
138 struct ipv6_ac_socklist {
139 	struct in6_addr		acl_addr;
140 	int			acl_ifindex;
141 	struct ipv6_ac_socklist *acl_next;
142 };
143 
144 struct ifacaddr6 {
145 	struct in6_addr		aca_addr;
146 	struct fib6_info	*aca_rt;
147 	struct ifacaddr6	*aca_next;
148 	struct hlist_node	aca_addr_lst;
149 	int			aca_users;
150 	refcount_t		aca_refcnt;
151 	unsigned long		aca_cstamp;
152 	unsigned long		aca_tstamp;
153 	struct rcu_head		rcu;
154 };
155 
156 #define	IFA_HOST	IPV6_ADDR_LOOPBACK
157 #define	IFA_LINK	IPV6_ADDR_LINKLOCAL
158 #define	IFA_SITE	IPV6_ADDR_SITELOCAL
159 
160 struct ipv6_devstat {
161 	struct proc_dir_entry	*proc_dir_entry;
162 	DEFINE_SNMP_STAT(struct ipstats_mib, ipv6);
163 	DEFINE_SNMP_STAT_ATOMIC(struct icmpv6_mib_device, icmpv6dev);
164 	DEFINE_SNMP_STAT_ATOMIC(struct icmpv6msg_mib_device, icmpv6msgdev);
165 };
166 
167 struct inet6_dev {
168 	struct net_device	*dev;
169 	netdevice_tracker	dev_tracker;
170 
171 	struct list_head	addr_list;
172 
173 	struct ifmcaddr6	__rcu *mc_list;
174 	struct ifmcaddr6	__rcu *mc_tomb;
175 
176 	unsigned char		mc_qrv;		/* Query Robustness Variable */
177 	unsigned char		mc_gq_running;
178 	unsigned char		mc_ifc_count;
179 	unsigned char		mc_dad_count;
180 
181 	unsigned long		mc_v1_seen;	/* Max time we stay in MLDv1 mode */
182 	unsigned long		mc_qi;		/* Query Interval */
183 	unsigned long		mc_qri;		/* Query Response Interval */
184 	unsigned long		mc_maxdelay;
185 
186 	struct delayed_work	mc_gq_work;	/* general query work */
187 	struct delayed_work	mc_ifc_work;	/* interface change work */
188 	struct delayed_work	mc_dad_work;	/* dad complete mc work */
189 	struct delayed_work	mc_query_work;	/* mld query work */
190 	struct delayed_work	mc_report_work;	/* mld report work */
191 
192 	struct sk_buff_head	mc_query_queue;		/* mld query queue */
193 	struct sk_buff_head	mc_report_queue;	/* mld report queue */
194 
195 	spinlock_t		mc_query_lock;	/* mld query queue lock */
196 	spinlock_t		mc_report_lock;	/* mld query report lock */
197 	struct mutex		mc_lock;	/* mld global lock */
198 
199 	struct ifacaddr6	*ac_list;
200 	rwlock_t		lock;
201 	refcount_t		refcnt;
202 	__u32			if_flags;
203 	int			dead;
204 
205 	u32			desync_factor;
206 	struct list_head	tempaddr_list;
207 
208 	struct in6_addr		token;
209 
210 	struct neigh_parms	*nd_parms;
211 	struct ipv6_devconf	cnf;
212 	struct ipv6_devstat	stats;
213 
214 	struct timer_list	rs_timer;
215 	__s32			rs_interval;	/* in jiffies */
216 	__u8			rs_probes;
217 
218 	unsigned long		tstamp; /* ipv6InterfaceTable update timestamp */
219 	struct rcu_head		rcu;
220 
221 	unsigned int		ra_mtu;
222 };
223 
ipv6_eth_mc_map(const struct in6_addr * addr,char * buf)224 static inline void ipv6_eth_mc_map(const struct in6_addr *addr, char *buf)
225 {
226 	/*
227 	 *	+-------+-------+-------+-------+-------+-------+
228 	 *      |   33  |   33  | DST13 | DST14 | DST15 | DST16 |
229 	 *      +-------+-------+-------+-------+-------+-------+
230 	 */
231 
232 	buf[0]= 0x33;
233 	buf[1]= 0x33;
234 
235 	memcpy(buf + 2, &addr->s6_addr32[3], sizeof(__u32));
236 }
237 
ipv6_arcnet_mc_map(const struct in6_addr * addr,char * buf)238 static inline void ipv6_arcnet_mc_map(const struct in6_addr *addr, char *buf)
239 {
240 	buf[0] = 0x00;
241 }
242 
ipv6_ib_mc_map(const struct in6_addr * addr,const unsigned char * broadcast,char * buf)243 static inline void ipv6_ib_mc_map(const struct in6_addr *addr,
244 				  const unsigned char *broadcast, char *buf)
245 {
246 	unsigned char scope = broadcast[5] & 0xF;
247 
248 	buf[0]  = 0;		/* Reserved */
249 	buf[1]  = 0xff;		/* Multicast QPN */
250 	buf[2]  = 0xff;
251 	buf[3]  = 0xff;
252 	buf[4]  = 0xff;
253 	buf[5]  = 0x10 | scope;	/* scope from broadcast address */
254 	buf[6]  = 0x60;		/* IPv6 signature */
255 	buf[7]  = 0x1b;
256 	buf[8]  = broadcast[8];	/* P_Key */
257 	buf[9]  = broadcast[9];
258 	memcpy(buf + 10, addr->s6_addr + 6, 10);
259 }
260 
ipv6_ipgre_mc_map(const struct in6_addr * addr,const unsigned char * broadcast,char * buf)261 static inline int ipv6_ipgre_mc_map(const struct in6_addr *addr,
262 				    const unsigned char *broadcast, char *buf)
263 {
264 	if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) {
265 		memcpy(buf, broadcast, 4);
266 	} else {
267 		/* v4mapped? */
268 		if ((addr->s6_addr32[0] | addr->s6_addr32[1] |
269 		     (addr->s6_addr32[2] ^ htonl(0x0000ffff))) != 0)
270 			return -EINVAL;
271 		memcpy(buf, &addr->s6_addr32[3], 4);
272 	}
273 	return 0;
274 }
275 
276 #endif
277