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| author | Yuyang Huang <sigefriedhyy@gmail.com> | 2026-08-08 09:56:33 +0900 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2026-08-13 12:30:27 +0200 |
| commit | cc17e386f8a5fc23a3bf49a45d17cd45b49fbb01 (patch) | |
| tree | 784d555f69554b7105316f8d6ff62accd137d80a /include | |
| parent | f6057f06ef7afa9893ed33603f7917fa39d237b5 (diff) | |
| download | linux-stable-cc17e386f8a5fc23a3bf49a45d17cd45b49fbb01.tar.gz linux-stable-cc17e386f8a5fc23a3bf49a45d17cd45b49fbb01.zip | |
ipv6: add ip6_del_rt_reason()
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/net/ip6_route.h | 2 | ||||
| -rw-r--r-- | include/uapi/linux/rtnetlink.h | 25 |
2 files changed, 27 insertions, 0 deletions
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h index 09ffe0f13ce7..cc045705862d 100644 --- a/include/net/ip6_route.h +++ b/include/net/ip6_route.h @@ -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 diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h index 27265fd31e5f..3988b51db539 100644 --- a/include/uapi/linux/rtnetlink.h +++ b/include/uapi/linux/rtnetlink.h @@ -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, |