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65ee00a940
New UAPI for nexthops as standalone objects: - defines netlink ancillary header, struct nhmsg - RTM commands for nexthop objects, RTM_*NEXTHOP, - RTNLGRP for nexthop notifications, RTNLGRP_NEXTHOP, - Attributes for creating nexthops, NHA_* - Attribute for route specs to specify a nexthop by id, RTA_NH_ID. The nexthop attributes and semantics follow the route and RTA ones for device, gateway and lwt encap. Unique to nexthop objects are a blackhole and a group which contains references to other nexthop objects. With the exception of blackhole and group, nexthop objects MUST contain a device. Gateway and encap are optional. Nexthop groups can only reference other pre-existing nexthops by id. If the NHA_ID attribute is present that id is used for the nexthop. If not specified, one is auto assigned. Dump requests can include attributes: - NHA_GROUPS to return only nexthop groups, - NHA_MASTER to limit dumps to nexthops with devices enslaved to the given master (e.g., VRF) - NHA_OIF to limit dumps to nexthops using given device nlmsg_route_perms in selinux code is updated for the new RTM comands. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
57 lines
1.5 KiB
C
57 lines
1.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_LINUX_NEXTHOP_H
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#define _UAPI_LINUX_NEXTHOP_H
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#include <linux/types.h>
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struct nhmsg {
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unsigned char nh_family;
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unsigned char nh_scope; /* return only */
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unsigned char nh_protocol; /* Routing protocol that installed nh */
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unsigned char resvd;
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unsigned int nh_flags; /* RTNH_F flags */
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};
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/* entry in a nexthop group */
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struct nexthop_grp {
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__u32 id; /* nexthop id - must exist */
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__u8 weight; /* weight of this nexthop */
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__u8 resvd1;
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__u16 resvd2;
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};
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enum {
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NEXTHOP_GRP_TYPE_MPATH, /* default type if not specified */
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__NEXTHOP_GRP_TYPE_MAX,
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};
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#define NEXTHOP_GRP_TYPE_MAX (__NEXTHOP_GRP_TYPE_MAX - 1)
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enum {
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NHA_UNSPEC,
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NHA_ID, /* u32; id for nexthop. id == 0 means auto-assign */
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NHA_GROUP, /* array of nexthop_grp */
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NHA_GROUP_TYPE, /* u16 one of NEXTHOP_GRP_TYPE */
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/* if NHA_GROUP attribute is added, no other attributes can be set */
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NHA_BLACKHOLE, /* flag; nexthop used to blackhole packets */
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/* if NHA_BLACKHOLE is added, OIF, GATEWAY, ENCAP can not be set */
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NHA_OIF, /* u32; nexthop device */
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NHA_GATEWAY, /* be32 (IPv4) or in6_addr (IPv6) gw address */
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NHA_ENCAP_TYPE, /* u16; lwt encap type */
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NHA_ENCAP, /* lwt encap data */
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/* NHA_OIF can be appended to dump request to return only
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* nexthops using given device
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*/
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NHA_GROUPS, /* flag; only return nexthop groups in dump */
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NHA_MASTER, /* u32; only return nexthops with given master dev */
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__NHA_MAX,
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};
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#define NHA_MAX (__NHA_MAX - 1)
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#endif
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