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ipv6: add ip6_del_rt_reason()

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Add RTA_DEL_REASON and enum rt_del_reason to the rtnetlink uAPI, and
add ip6_del_rt_reason(), which takes the reason a route is being
deleted. It has no skip_notify argument: a caller that records a
deletion reason wants the notification that carries it.

The reason is unused for now. Subsequent patches propagate it to the
deletion path and report it on RTM_DELROUTE.

Signed-off-by: Yuyang Huang <sigefriedhyy@gmail.com>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://patch.msgid.link/20260808005642.26901-2-sigefriedhyy@gmail.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Yuyang Huang
2026-08-08 09:56:33 +09:00
committed by Paolo Abeni
parent f6057f06ef
commit cc17e386f8
3 changed files with 35 additions and 0 deletions
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2
include/net/ip6_route.h
View File

@@ -126,6 +126,8 @@ int ipv6_route_ioctl(struct net *net, unsigned int cmd,
int ip6_route_add(struct fib6_config *cfg, gfp_t gfp_flags,
struct netlink_ext_ack *extack);
int ip6_ins_rt(struct net *net, struct fib6_info *f6i);
int ip6_del_rt_reason(struct net *net, struct fib6_info *f6i,
enum rt_del_reason del_reason);
#if IS_ENABLED(CONFIG_IPV6)
int ip6_del_rt(struct net *net, struct fib6_info *f6i, bool skip_notify);
#else

25
include/uapi/linux/rtnetlink.h
View File

@@ -399,6 +399,7 @@ enum rtattr_type_t {
RTA_DPORT,
RTA_NH_ID,
RTA_FLOWLABEL,
RTA_DEL_REASON,
__RTA_MAX
};
@@ -407,6 +408,30 @@ enum rtattr_type_t {
#define RTM_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct rtmsg))))
#define RTM_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct rtmsg))
/* RTA_DEL_REASON: why the kernel deleted the route. u32.
* Emitted only on RTM_DELROUTE notifications, and only when the deletion
* path records a cause. Absence means either an older kernel or a
* deletion path that does not (yet) record its cause - consumers must
* treat "absent" and "unspec" identically. New causes may be appended.
* Currently only IPv6 deletion paths record a cause.
*
* The attribute is notification-only: the kernel rejects it in
* requests, so a notification must not be echoed back verbatim.
*
* The value space is family-agnostic: a value must never be
* reinterpreted per address family. A cause that only one family can
* produce still gets its own value rather than reusing another
* family's.
*/
enum rt_del_reason {
RT_DEL_REASON_UNSPEC, /* cause not recorded */
RT_DEL_REASON_EXPIRED, /* RTF_EXPIRES lifetime ran out (GC) */
RT_DEL_REASON_RA_WITHDRAWN, /* zero-lifetime RA / PIO / RIO */
__RT_DEL_REASON_MAX
};
#define RT_DEL_REASON_MAX (__RT_DEL_REASON_MAX - 1)
/* RTM_MULTIPATH --- array of struct rtnexthop.
*
* "struct rtnexthop" describes all necessary nexthop information,

8
net/ipv6/route.c
View File

@@ -4004,6 +4004,14 @@ int ip6_del_rt(struct net *net, struct fib6_info *rt, bool skip_notify)
return __ip6_del_rt(rt, &info);
}
int ip6_del_rt_reason(struct net *net, struct fib6_info *rt,
enum rt_del_reason del_reason)
{
struct nl_info info = { .nl_net = net };
return __ip6_del_rt(rt, &info);
}
static int __ip6_del_rt_siblings(struct fib6_info *rt, struct fib6_config *cfg)
{
struct nl_info *info = &cfg->fc_nlinfo;