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 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[] __counted_by(sl_max);
  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 __rcu  *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 __rcu  *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
 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
 238 static inline void ipv6_arcnet_mc_map(const struct in6_addr *addr, char *buf)
 239 {
 240         buf[0] = 0x00;
 241 }
 242
 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
 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