mirror of https://gitee.com/openkylin/linux.git
81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/*
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* IPv6 library code, needed by static components when full IPv6 support is
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* not configured or static.
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*/
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#include <linux/export.h>
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#include <net/ipv6.h>
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#define IPV6_ADDR_SCOPE_TYPE(scope) ((scope) << 16)
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static inline unsigned int ipv6_addr_scope2type(unsigned int scope)
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{
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switch (scope) {
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case IPV6_ADDR_SCOPE_NODELOCAL:
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return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_NODELOCAL) |
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IPV6_ADDR_LOOPBACK);
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case IPV6_ADDR_SCOPE_LINKLOCAL:
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return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL) |
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IPV6_ADDR_LINKLOCAL);
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case IPV6_ADDR_SCOPE_SITELOCAL:
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return (IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL) |
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IPV6_ADDR_SITELOCAL);
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}
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return IPV6_ADDR_SCOPE_TYPE(scope);
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}
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int __ipv6_addr_type(const struct in6_addr *addr)
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{
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__be32 st;
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st = addr->s6_addr32[0];
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/* Consider all addresses with the first three bits different of
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000 and 111 as unicasts.
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*/
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if ((st & htonl(0xE0000000)) != htonl(0x00000000) &&
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(st & htonl(0xE0000000)) != htonl(0xE0000000))
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return (IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL));
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if ((st & htonl(0xFF000000)) == htonl(0xFF000000)) {
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/* multicast */
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/* addr-select 3.1 */
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return (IPV6_ADDR_MULTICAST |
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ipv6_addr_scope2type(IPV6_ADDR_MC_SCOPE(addr)));
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}
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if ((st & htonl(0xFFC00000)) == htonl(0xFE800000))
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return (IPV6_ADDR_LINKLOCAL | IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.1 */
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if ((st & htonl(0xFFC00000)) == htonl(0xFEC00000))
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return (IPV6_ADDR_SITELOCAL | IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_SITELOCAL)); /* addr-select 3.1 */
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if ((st & htonl(0xFE000000)) == htonl(0xFC000000))
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return (IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* RFC 4193 */
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if ((addr->s6_addr32[0] | addr->s6_addr32[1]) == 0) {
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if (addr->s6_addr32[2] == 0) {
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if (addr->s6_addr32[3] == 0)
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return IPV6_ADDR_ANY;
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if (addr->s6_addr32[3] == htonl(0x00000001))
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return (IPV6_ADDR_LOOPBACK | IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_LINKLOCAL)); /* addr-select 3.4 */
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return (IPV6_ADDR_COMPATv4 | IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
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}
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if (addr->s6_addr32[2] == htonl(0x0000ffff))
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return (IPV6_ADDR_MAPPED |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.3 */
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}
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return (IPV6_ADDR_UNICAST |
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IPV6_ADDR_SCOPE_TYPE(IPV6_ADDR_SCOPE_GLOBAL)); /* addr-select 3.4 */
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}
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EXPORT_SYMBOL(__ipv6_addr_type);
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