include/net/if_inet6.h

   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 #include <linux/refcount.h>
  21
  22 /* inet6_dev.if_flags */
  23
  24 #define IF_RA_OTHERCONF 0x80
  25 #define IF_RA_MANAGED   0x40
  26 #define IF_RA_RCVD      0x20
  27 #define IF_RS_SENT      0x10
  28 #define IF_READY        0x80000000
  29
  30 /* prefix flags */
  31 #define IF_PREFIX_ONLINK        0x01
  32 #define IF_PREFIX_AUTOCONF      0x02
  33
  34 enum {
  35         INET6_IFADDR_STATE_PREDAD,
  36         INET6_IFADDR_STATE_DAD,
  37         INET6_IFADDR_STATE_POSTDAD,
  38         INET6_IFADDR_STATE_ERRDAD,
  39         INET6_IFADDR_STATE_DEAD,
  40 };
  41
  42 struct inet6_ifaddr {
  43         struct in6_addr         addr;
  44         __u32                   prefix_len;
  45         __u32                   rt_priority;
  46
  47         /* In seconds, relative to tstamp. Expiry is at tstamp + HZ * lft. */
  48         __u32                   valid_lft;
  49         __u32                   prefered_lft;
  50         refcount_t              refcnt;
  51         spinlock_t              lock;
  52
  53         int                     state;
  54
  55         __u32                   flags;
  56         __u8                    dad_probes;
  57         __u8                    stable_privacy_retry;
  58
  59         __u16                   scope;
  60         __u64                   dad_nonce;
  61
  62         unsigned long           cstamp; /* created timestamp */
  63         unsigned long           tstamp; /* updated timestamp */
  64
  65         struct delayed_work     dad_work;
  66
  67         struct inet6_dev        *idev;
  68         struct fib6_info        *rt;
  69
  70         struct hlist_node       addr_lst;
  71         struct list_head        if_list;
  72         /*
  73          * Used to safely traverse idev->addr_list in process context
  74          * if the idev->lock needed to protect idev->addr_list cannot be held.
  75          * In that case, add the items to this list temporarily and iterate
  76          * without holding idev->lock.
  77          * See addrconf_ifdown and dev_forward_change.
  78          */
  79         struct list_head        if_list_aux;
  80
  81         struct list_head        tmp_list;
  82         struct inet6_ifaddr     *ifpub;
  83         int                     regen_count;
  84
  85         bool                    tokenized;
  86
  87         struct rcu_head         rcu;
  88         struct in6_addr         peer_addr;
  89 };
  90
  91 struct ip6_sf_socklist {
  92         unsigned int            sl_max;
  93         unsigned int            sl_count;
  94         struct in6_addr         sl_addr[0];
  95 };
  96
  97 #define IP6_SFLSIZE(count)      (sizeof(struct ip6_sf_socklist) + \
  98         (count) * sizeof(struct in6_addr))
  99
 100 #define IP6_SFBLOCK     10      /* allocate this many at once */
 101
 102 struct ipv6_mc_socklist {
 103         struct in6_addr         addr;
 104         int                     ifindex;
 105         struct ipv6_mc_socklist __rcu *next;
 106         rwlock_t                sflock;
 107         unsigned int            sfmode;         /* MCAST_{INCLUDE,EXCLUDE} */
 108         struct ip6_sf_socklist  *sflist;
 109         struct rcu_head         rcu;
 110 };
 111
 112 struct ip6_sf_list {
 113         struct ip6_sf_list      *sf_next;
 114         struct in6_addr         sf_addr;
 115         unsigned long           sf_count[2];    /* include/exclude counts */
 116         unsigned char           sf_gsresp;      /* include in g & s response? */
 117         unsigned char           sf_oldin;       /* change state */
 118         unsigned char           sf_crcount;     /* retrans. left to send */
 119 };
 120
 121 #define MAF_TIMER_RUNNING       0x01
 122 #define MAF_LAST_REPORTER       0x02
 123 #define MAF_LOADED              0x04
 124 #define MAF_NOREPORT            0x08
 125 #define MAF_GSQUERY             0x10
 126
 127 struct ifmcaddr6 {
 128         struct in6_addr         mca_addr;
 129         struct inet6_dev        *idev;
 130         struct ifmcaddr6        *next;
 131         struct ip6_sf_list      *mca_sources;
 132         struct ip6_sf_list      *mca_tomb;
 133         unsigned int            mca_sfmode;
 134         unsigned char           mca_crcount;
 135         unsigned long           mca_sfcount[2];
 136         struct timer_list       mca_timer;
 137         unsigned int            mca_flags;
 138         int                     mca_users;
 139         refcount_t              mca_refcnt;
 140         spinlock_t              mca_lock;
 141         unsigned long           mca_cstamp;
 142         unsigned long           mca_tstamp;
 143 };
 144
 145 /* Anycast stuff */
 146
 147 struct ipv6_ac_socklist {
 148         struct in6_addr         acl_addr;
 149         int                     acl_ifindex;
 150         struct ipv6_ac_socklist *acl_next;
 151 };
 152
 153 struct ifacaddr6 {
 154         struct in6_addr         aca_addr;
 155         struct fib6_info        *aca_rt;
 156         struct ifacaddr6        *aca_next;
 157         int                     aca_users;
 158         refcount_t              aca_refcnt;
 159         unsigned long           aca_cstamp;
 160         unsigned long           aca_tstamp;
 161 };
 162
 163 #define IFA_HOST        IPV6_ADDR_LOOPBACK
 164 #define IFA_LINK        IPV6_ADDR_LINKLOCAL
 165 #define IFA_SITE        IPV6_ADDR_SITELOCAL
 166
 167 struct ipv6_devstat {
 168         struct proc_dir_entry   *proc_dir_entry;
 169         DEFINE_SNMP_STAT(struct ipstats_mib, ipv6);
 170         DEFINE_SNMP_STAT_ATOMIC(struct icmpv6_mib_device, icmpv6dev);
 171         DEFINE_SNMP_STAT_ATOMIC(struct icmpv6msg_mib_device, icmpv6msgdev);
 172 };
 173
 174 struct inet6_dev {
 175         struct net_device       *dev;
 176
 177         struct list_head        addr_list;
 178
 179         struct ifmcaddr6        *mc_list;
 180         struct ifmcaddr6        *mc_tomb;
 181         spinlock_t              mc_lock;
 182
 183         unsigned char           mc_qrv;         /* Query Robustness Variable */
 184         unsigned char           mc_gq_running;
 185         unsigned char           mc_ifc_count;
 186         unsigned char           mc_dad_count;
 187
 188         unsigned long           mc_v1_seen;     /* Max time we stay in MLDv1 mode */
 189         unsigned long           mc_qi;          /* Query Interval */
 190         unsigned long           mc_qri;         /* Query Response Interval */
 191         unsigned long           mc_maxdelay;
 192
 193         struct timer_list       mc_gq_timer;    /* general query timer */
 194         struct timer_list       mc_ifc_timer;   /* interface change timer */
 195         struct timer_list       mc_dad_timer;   /* dad complete mc timer */
 196
 197         struct ifacaddr6        *ac_list;
 198         rwlock_t                lock;
 199         refcount_t              refcnt;
 200         __u32                   if_flags;
 201         int                     dead;
 202
 203         u32                     desync_factor;
 204         u8                      rndid[8];
 205         struct list_head        tempaddr_list;
 206
 207         struct in6_addr         token;
 208
 209         struct neigh_parms      *nd_parms;
 210         struct ipv6_devconf     cnf;
 211         struct ipv6_devstat     stats;
 212
 213         struct timer_list       rs_timer;
 214         __s32                   rs_interval;    /* in jiffies */
 215         __u8                    rs_probes;
 216
 217         unsigned long           tstamp; /* ipv6InterfaceTable update timestamp */
 218         struct rcu_head         rcu;
 219 };
 220
 221 static inline void ipv6_eth_mc_map(const struct in6_addr *addr, char *buf)
 222 {
 223         /*
 224          *      +-------+-------+-------+-------+-------+-------+
 225          *      |   33  |   33  | DST13 | DST14 | DST15 | DST16 |
 226          *      +-------+-------+-------+-------+-------+-------+
 227          */
 228
 229         buf[0]= 0x33;
 230         buf[1]= 0x33;
 231
 232         memcpy(buf + 2, &addr->s6_addr32[3], sizeof(__u32));
 233 }
 234
 235 static inline void ipv6_arcnet_mc_map(const struct in6_addr *addr, char *buf)
 236 {
 237         buf[0] = 0x00;
 238 }
 239
 240 static inline void ipv6_ib_mc_map(const struct in6_addr *addr,
 241                                   const unsigned char *broadcast, char *buf)
 242 {
 243         unsigned char scope = broadcast[5] & 0xF;
 244
 245         buf[0]  = 0;            /* Reserved */
 246         buf[1]  = 0xff;         /* Multicast QPN */
 247         buf[2]  = 0xff;
 248         buf[3]  = 0xff;
 249         buf[4]  = 0xff;
 250         buf[5]  = 0x10 | scope; /* scope from broadcast address */
 251         buf[6]  = 0x60;         /* IPv6 signature */
 252         buf[7]  = 0x1b;
 253         buf[8]  = broadcast[8]; /* P_Key */
 254         buf[9]  = broadcast[9];
 255         memcpy(buf + 10, addr->s6_addr + 6, 10);
 256 }
 257
 258 static inline int ipv6_ipgre_mc_map(const struct in6_addr *addr,
 259                                     const unsigned char *broadcast, char *buf)
 260 {
 261         if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) {
 262                 memcpy(buf, broadcast, 4);
 263         } else {
 264                 /* v4mapped? */
 265                 if ((addr->s6_addr32[0] | addr->s6_addr32[1] |
 266                      (addr->s6_addr32[2] ^ htonl(0x0000ffff))) != 0)
 267                         return -EINVAL;
 268                 memcpy(buf, &addr->s6_addr32[3], 4);
 269         }
 270         return 0;
 271 }
 272
 273 #endif