Commit 65ee00a9 authored by David Ahern's avatar David Ahern Committed by David S. Miller

net: nexthop uapi

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: default avatarDavid Ahern <dsahern@gmail.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 602e0f29
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _UAPI_LINUX_NEXTHOP_H
#define _UAPI_LINUX_NEXTHOP_H
#include <linux/types.h>
struct nhmsg {
unsigned char nh_family;
unsigned char nh_scope; /* return only */
unsigned char nh_protocol; /* Routing protocol that installed nh */
unsigned char resvd;
unsigned int nh_flags; /* RTNH_F flags */
};
/* entry in a nexthop group */
struct nexthop_grp {
__u32 id; /* nexthop id - must exist */
__u8 weight; /* weight of this nexthop */
__u8 resvd1;
__u16 resvd2;
};
enum {
NEXTHOP_GRP_TYPE_MPATH, /* default type if not specified */
__NEXTHOP_GRP_TYPE_MAX,
};
#define NEXTHOP_GRP_TYPE_MAX (__NEXTHOP_GRP_TYPE_MAX - 1)
enum {
NHA_UNSPEC,
NHA_ID, /* u32; id for nexthop. id == 0 means auto-assign */
NHA_GROUP, /* array of nexthop_grp */
NHA_GROUP_TYPE, /* u16 one of NEXTHOP_GRP_TYPE */
/* if NHA_GROUP attribute is added, no other attributes can be set */
NHA_BLACKHOLE, /* flag; nexthop used to blackhole packets */
/* if NHA_BLACKHOLE is added, OIF, GATEWAY, ENCAP can not be set */
NHA_OIF, /* u32; nexthop device */
NHA_GATEWAY, /* be32 (IPv4) or in6_addr (IPv6) gw address */
NHA_ENCAP_TYPE, /* u16; lwt encap type */
NHA_ENCAP, /* lwt encap data */
/* NHA_OIF can be appended to dump request to return only
* nexthops using given device
*/
NHA_GROUPS, /* flag; only return nexthop groups in dump */
NHA_MASTER, /* u32; only return nexthops with given master dev */
__NHA_MAX,
};
#define NHA_MAX (__NHA_MAX - 1)
#endif
......@@ -157,6 +157,13 @@ enum {
RTM_GETCHAIN,
#define RTM_GETCHAIN RTM_GETCHAIN
RTM_NEWNEXTHOP = 104,
#define RTM_NEWNEXTHOP RTM_NEWNEXTHOP
RTM_DELNEXTHOP,
#define RTM_DELNEXTHOP RTM_DELNEXTHOP
RTM_GETNEXTHOP,
#define RTM_GETNEXTHOP RTM_GETNEXTHOP
__RTM_MAX,
#define RTM_MAX (((__RTM_MAX + 3) & ~3) - 1)
};
......@@ -342,6 +349,7 @@ enum rtattr_type_t {
RTA_IP_PROTO,
RTA_SPORT,
RTA_DPORT,
RTA_NH_ID,
__RTA_MAX
};
......@@ -704,6 +712,8 @@ enum rtnetlink_groups {
#define RTNLGRP_IPV4_MROUTE_R RTNLGRP_IPV4_MROUTE_R
RTNLGRP_IPV6_MROUTE_R,
#define RTNLGRP_IPV6_MROUTE_R RTNLGRP_IPV6_MROUTE_R
RTNLGRP_NEXTHOP,
#define RTNLGRP_NEXTHOP RTNLGRP_NEXTHOP
__RTNLGRP_MAX
};
#define RTNLGRP_MAX (__RTNLGRP_MAX - 1)
......
......@@ -83,6 +83,9 @@ static const struct nlmsg_perm nlmsg_route_perms[] =
{ RTM_NEWCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETCHAIN, NETLINK_ROUTE_SOCKET__NLMSG_READ },
{ RTM_NEWNEXTHOP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_DELNEXTHOP, NETLINK_ROUTE_SOCKET__NLMSG_WRITE },
{ RTM_GETNEXTHOP, NETLINK_ROUTE_SOCKET__NLMSG_READ },
};
static const struct nlmsg_perm nlmsg_tcpdiag_perms[] =
......@@ -166,7 +169,7 @@ int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm)
* structures at the top of this file with the new mappings
* before updating the BUILD_BUG_ON() macro!
*/
BUILD_BUG_ON(RTM_MAX != (RTM_NEWCHAIN + 3));
BUILD_BUG_ON(RTM_MAX != (RTM_NEWNEXTHOP + 3));
err = nlmsg_perm(nlmsg_type, perm, nlmsg_route_perms,
sizeof(nlmsg_route_perms));
break;
......
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