mirror of
https://github.com/linux-msm/laptops-kernel.git
synced 2026-08-13 14:19:53 -07:00
Yuyang HuangandPaolo Abeni
7cb8198761
RTM_GETMULTICAST has been part of the rtnetlink ABI for a long time and already reports IPv4 multicast group membership through IFA_MULTICAST and IFA_CACHEINFO. It does not report how many consumers hold each membership, so userspace still has to parse /proc/net/igmp to get the Users column. Add IFA_MC_USERS as a u32 attribute carrying ip_mc_list::users in RTM_GETMULTICAST replies and entry-lifecycle notifications. This gives iproute2 enough information to migrate the IPv4 part of "ip maddr show" from procfs parsing to rtnetlink. Signed-off-by: Yuyang Huang <sigefriedhyy@gmail.com> Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Link: https://patch.msgid.link/20260630110207.37841-2-sigefriedhyy@gmail.com Signed-off-by: Paolo Abeni <pabeni@redhat.com>
81 lines
2.2 KiB
C
81 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI__LINUX_IF_ADDR_H
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#define _UAPI__LINUX_IF_ADDR_H
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#include <linux/types.h>
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#include <linux/netlink.h>
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struct ifaddrmsg {
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__u8 ifa_family;
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__u8 ifa_prefixlen; /* The prefix length */
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__u8 ifa_flags; /* Flags */
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__u8 ifa_scope; /* Address scope */
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__u32 ifa_index; /* Link index */
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};
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/*
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* Important comment:
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* IFA_ADDRESS is prefix address, rather than local interface address.
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* It makes no difference for normally configured broadcast interfaces,
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* but for point-to-point IFA_ADDRESS is DESTINATION address,
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* local address is supplied in IFA_LOCAL attribute.
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*
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* IFA_FLAGS is a u32 attribute that extends the u8 field ifa_flags.
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* If present, the value from struct ifaddrmsg will be ignored.
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*/
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enum {
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IFA_UNSPEC,
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IFA_ADDRESS,
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IFA_LOCAL,
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IFA_LABEL,
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IFA_BROADCAST,
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IFA_ANYCAST,
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IFA_CACHEINFO,
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IFA_MULTICAST,
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IFA_FLAGS,
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IFA_RT_PRIORITY, /* u32, priority/metric for prefix route */
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IFA_TARGET_NETNSID,
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IFA_PROTO, /* u8, address protocol */
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IFA_MC_USERS, /* u32, multicast group users */
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__IFA_MAX,
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};
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#define IFA_MAX (__IFA_MAX - 1)
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/* ifa_flags */
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#define IFA_F_SECONDARY 0x01
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#define IFA_F_TEMPORARY IFA_F_SECONDARY
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#define IFA_F_NODAD 0x02
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#define IFA_F_OPTIMISTIC 0x04
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#define IFA_F_DADFAILED 0x08
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#define IFA_F_HOMEADDRESS 0x10
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#define IFA_F_DEPRECATED 0x20
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#define IFA_F_TENTATIVE 0x40
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#define IFA_F_PERMANENT 0x80
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#define IFA_F_MANAGETEMPADDR 0x100
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#define IFA_F_NOPREFIXROUTE 0x200
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#define IFA_F_MCAUTOJOIN 0x400
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#define IFA_F_STABLE_PRIVACY 0x800
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struct ifa_cacheinfo {
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__u32 ifa_prefered;
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__u32 ifa_valid;
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__u32 cstamp; /* created timestamp, hundredths of seconds */
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__u32 tstamp; /* updated timestamp, hundredths of seconds */
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};
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/* backwards compatibility for userspace */
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#ifndef __KERNEL__
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#define IFA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ifaddrmsg))))
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#define IFA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct ifaddrmsg))
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#endif
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/* ifa_proto */
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#define IFAPROT_UNSPEC 0
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#define IFAPROT_KERNEL_LO 1 /* loopback */
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#define IFAPROT_KERNEL_RA 2 /* set by kernel from router announcement */
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#define IFAPROT_KERNEL_LL 3 /* link-local set by kernel */
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#endif
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