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4b3087c7e3
When multiple multicast routers are present in a broadcast domain then
only one of them will be detectable via IGMP/MLD query snooping. The
multicast router with the lowest IP address will become the selected and
active querier while all other multicast routers will then refrain from
sending queries.
To detect such rather silent multicast routers, too, RFC4286
("Multicast Router Discovery") provides a standardized protocol to
detect multicast routers for multicast snooping switches.
This patch implements the necessary MRD Advertisement message parsing
and after successful processing adds such routers to the internal
multicast router list.
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: David S. Miller <davem@davemloft.net>
110 lines
2.5 KiB
C
110 lines
2.5 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Definitions of the Internet Protocol.
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*
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* Version: @(#)in.h 1.0.1 04/21/93
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*
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* Authors: Original taken from the GNU Project <netinet/in.h> file.
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _LINUX_IN_H
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#define _LINUX_IN_H
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#include <linux/errno.h>
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#include <uapi/linux/in.h>
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static inline int proto_ports_offset(int proto)
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{
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switch (proto) {
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case IPPROTO_TCP:
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case IPPROTO_UDP:
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case IPPROTO_DCCP:
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case IPPROTO_ESP: /* SPI */
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case IPPROTO_SCTP:
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case IPPROTO_UDPLITE:
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return 0;
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case IPPROTO_AH: /* SPI */
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return 4;
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default:
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return -EINVAL;
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}
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}
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static inline bool ipv4_is_loopback(__be32 addr)
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{
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return (addr & htonl(0xff000000)) == htonl(0x7f000000);
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}
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static inline bool ipv4_is_multicast(__be32 addr)
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{
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return (addr & htonl(0xf0000000)) == htonl(0xe0000000);
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}
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static inline bool ipv4_is_local_multicast(__be32 addr)
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{
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return (addr & htonl(0xffffff00)) == htonl(0xe0000000);
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}
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static inline bool ipv4_is_lbcast(__be32 addr)
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{
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/* limited broadcast */
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return addr == htonl(INADDR_BROADCAST);
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}
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static inline bool ipv4_is_all_snoopers(__be32 addr)
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{
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return addr == htonl(INADDR_ALLSNOOPERS_GROUP);
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}
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static inline bool ipv4_is_zeronet(__be32 addr)
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{
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return (addr & htonl(0xff000000)) == htonl(0x00000000);
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}
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/* Special-Use IPv4 Addresses (RFC3330) */
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static inline bool ipv4_is_private_10(__be32 addr)
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{
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return (addr & htonl(0xff000000)) == htonl(0x0a000000);
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}
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static inline bool ipv4_is_private_172(__be32 addr)
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{
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return (addr & htonl(0xfff00000)) == htonl(0xac100000);
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}
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static inline bool ipv4_is_private_192(__be32 addr)
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{
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return (addr & htonl(0xffff0000)) == htonl(0xc0a80000);
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}
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static inline bool ipv4_is_linklocal_169(__be32 addr)
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{
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return (addr & htonl(0xffff0000)) == htonl(0xa9fe0000);
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}
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static inline bool ipv4_is_anycast_6to4(__be32 addr)
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{
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return (addr & htonl(0xffffff00)) == htonl(0xc0586300);
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}
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static inline bool ipv4_is_test_192(__be32 addr)
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{
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return (addr & htonl(0xffffff00)) == htonl(0xc0000200);
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}
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static inline bool ipv4_is_test_198(__be32 addr)
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{
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return (addr & htonl(0xfffe0000)) == htonl(0xc6120000);
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}
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#endif /* _LINUX_IN_H */
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