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>
170 lines
3.9 KiB
C
170 lines
3.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_LINUX_ICMPV6_H
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#define _UAPI_LINUX_ICMPV6_H
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#include <linux/types.h>
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#include <asm/byteorder.h>
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struct icmp6hdr {
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__u8 icmp6_type;
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__u8 icmp6_code;
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__sum16 icmp6_cksum;
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union {
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__be32 un_data32[1];
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__be16 un_data16[2];
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__u8 un_data8[4];
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struct icmpv6_echo {
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__be16 identifier;
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__be16 sequence;
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} u_echo;
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struct icmpv6_nd_advt {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u32 reserved:5,
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override:1,
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solicited:1,
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router:1,
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reserved2:24;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u32 router:1,
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solicited:1,
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override:1,
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reserved:29;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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} u_nd_advt;
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struct icmpv6_nd_ra {
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__u8 hop_limit;
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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__u8 reserved:3,
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router_pref:2,
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home_agent:1,
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other:1,
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managed:1;
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#elif defined(__BIG_ENDIAN_BITFIELD)
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__u8 managed:1,
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other:1,
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home_agent:1,
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router_pref:2,
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reserved:3;
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#else
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#error "Please fix <asm/byteorder.h>"
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#endif
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__be16 rt_lifetime;
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} u_nd_ra;
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} icmp6_dataun;
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#define icmp6_identifier icmp6_dataun.u_echo.identifier
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#define icmp6_sequence icmp6_dataun.u_echo.sequence
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#define icmp6_pointer icmp6_dataun.un_data32[0]
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#define icmp6_mtu icmp6_dataun.un_data32[0]
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#define icmp6_unused icmp6_dataun.un_data32[0]
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#define icmp6_maxdelay icmp6_dataun.un_data16[0]
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#define icmp6_router icmp6_dataun.u_nd_advt.router
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#define icmp6_solicited icmp6_dataun.u_nd_advt.solicited
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#define icmp6_override icmp6_dataun.u_nd_advt.override
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#define icmp6_ndiscreserved icmp6_dataun.u_nd_advt.reserved
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#define icmp6_hop_limit icmp6_dataun.u_nd_ra.hop_limit
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#define icmp6_addrconf_managed icmp6_dataun.u_nd_ra.managed
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#define icmp6_addrconf_other icmp6_dataun.u_nd_ra.other
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#define icmp6_rt_lifetime icmp6_dataun.u_nd_ra.rt_lifetime
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#define icmp6_router_pref icmp6_dataun.u_nd_ra.router_pref
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};
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#define ICMPV6_ROUTER_PREF_LOW 0x3
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#define ICMPV6_ROUTER_PREF_MEDIUM 0x0
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#define ICMPV6_ROUTER_PREF_HIGH 0x1
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#define ICMPV6_ROUTER_PREF_INVALID 0x2
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#define ICMPV6_DEST_UNREACH 1
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#define ICMPV6_PKT_TOOBIG 2
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#define ICMPV6_TIME_EXCEED 3
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#define ICMPV6_PARAMPROB 4
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#define ICMPV6_INFOMSG_MASK 0x80
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#define ICMPV6_ECHO_REQUEST 128
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#define ICMPV6_ECHO_REPLY 129
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#define ICMPV6_MGM_QUERY 130
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#define ICMPV6_MGM_REPORT 131
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#define ICMPV6_MGM_REDUCTION 132
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#define ICMPV6_NI_QUERY 139
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#define ICMPV6_NI_REPLY 140
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#define ICMPV6_MLD2_REPORT 143
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#define ICMPV6_DHAAD_REQUEST 144
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#define ICMPV6_DHAAD_REPLY 145
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#define ICMPV6_MOBILE_PREFIX_SOL 146
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#define ICMPV6_MOBILE_PREFIX_ADV 147
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#define ICMPV6_MRDISC_ADV 151
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/*
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* Codes for Destination Unreachable
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*/
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#define ICMPV6_NOROUTE 0
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#define ICMPV6_ADM_PROHIBITED 1
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#define ICMPV6_NOT_NEIGHBOUR 2
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#define ICMPV6_ADDR_UNREACH 3
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#define ICMPV6_PORT_UNREACH 4
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#define ICMPV6_POLICY_FAIL 5
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#define ICMPV6_REJECT_ROUTE 6
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/*
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* Codes for Time Exceeded
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*/
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#define ICMPV6_EXC_HOPLIMIT 0
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#define ICMPV6_EXC_FRAGTIME 1
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/*
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* Codes for Parameter Problem
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*/
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#define ICMPV6_HDR_FIELD 0
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#define ICMPV6_UNK_NEXTHDR 1
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#define ICMPV6_UNK_OPTION 2
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/*
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* constants for (set|get)sockopt
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*/
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#define ICMPV6_FILTER 1
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/*
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* ICMPV6 filter
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*/
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#define ICMPV6_FILTER_BLOCK 1
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#define ICMPV6_FILTER_PASS 2
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#define ICMPV6_FILTER_BLOCKOTHERS 3
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#define ICMPV6_FILTER_PASSONLY 4
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struct icmp6_filter {
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__u32 data[8];
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};
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/*
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* Definitions for MLDv2
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*/
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#define MLD2_MODE_IS_INCLUDE 1
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#define MLD2_MODE_IS_EXCLUDE 2
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#define MLD2_CHANGE_TO_INCLUDE 3
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#define MLD2_CHANGE_TO_EXCLUDE 4
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#define MLD2_ALLOW_NEW_SOURCES 5
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#define MLD2_BLOCK_OLD_SOURCES 6
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#define MLD2_ALL_MCR_INIT { { { 0xff,0x02,0,0,0,0,0,0,0,0,0,0,0,0,0,0x16 } } }
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#endif /* _UAPI_LINUX_ICMPV6_H */
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