include/net/if_inet6.h

   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
 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
 242 static inline void ipv6_arcnet_mc_map(const struct in6_addr *addr, char *buf)
 243 {
 244         buf[0] = 0x00;
 245 }
 246
 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
 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