linux-imx

/*

 * IPv6 library code, needed by static components when full IPv6 support is

 * not configured or static.

 */

​

#include <linux/export.h>

#include <net/ipv6.h>

#include <net/addrconf.h>

#include <net/ip.h>

​

/* if ipv6 module registers this function is used by xfrm to force all

 * sockets to relookup their nodes - this is fairly expensive, be

 * careful

 */

void (*__fib6_flush_trees)(struct net *);

EXPORT_SYMBOL(__fib6_flush_trees);

​

#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)

​

static inline unsigned int ipv6_addr_scope2type(unsigned int scope)

{

    switch (scope) {

    case IPV6_ADDR_SCOPE_NODELOCAL:

        return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |

            IPV6_ADDR_LOOPBACK);

    case IPV6_ADDR_SCOPE_LINKLOCAL:

        return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |

            IPV6_ADDR_LINKLOCAL);

    case IPV6_ADDR_SCOPE_SITELOCAL:

        return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |

            IPV6_ADDR_SITELOCAL);

    }

    return IPV6_ADDR_SCOPE_TYPE(scope);

}

​

int __ipv6_addr_type(const struct in6_addr *addr)

{

    __be32 st;

​

    st = addr->s6_addr32[0];

​

    /* Consider all addresses with the first three bits different of

       000 and 111 as unicasts.

     */

    if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&

        (st & htonl(0xE0000000)) != htonl(0xE0000000))

        return (IPV6_ADDR_UNICAST |

            IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));

​

    if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {

        /* multicast */

        /* addr-select 3.1 */

        return (IPV6_ADDR_MULTICAST |

            ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));

    }

​

    if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))

        return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |

            IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));       /* addr-select 3.1 */

    if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))

        return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |

            IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL));       /* addr-select 3.1 */

    if ((st & htonl(0xFE000000)) == htonl(0xFC000000))

        return (IPV6_ADDR_UNICAST |

            IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));          /* RFC 4193 */

​

    if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {

        if (addr->s6_addr32[2] == 0) {

            if (addr->s6_addr32[3] == 0)

                return IPV6_ADDR_ANY;

​

            if (addr->s6_addr32[3] == htonl(0x00000001))

                return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |

                    IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL));   /* addr-select 3.4 */

​

            return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |

                IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */

        }

​

        if (addr->s6_addr32[2] == htonl(0x0000ffff))

            return (IPV6_ADDR_MAPPED |

                IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.3 */

    }

​

    return (IPV6_ADDR_UNICAST |

        IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));  /* addr-select 3.4 */

}

EXPORT_SYMBOL(__ipv6_addr_type);

​

static ATOMIC_NOTIFIER_HEAD(inet6addr_chain);

static BLOCKING_NOTIFIER_HEAD(inet6addr_validator_chain);

​