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710ec56223
- RTM_NEWNEXTHOP et.al. that handle resilient groups will have a new nested
attribute, NHA_RES_GROUP, whose elements are attributes NHA_RES_GROUP_*.
- RTM_NEWNEXTHOPBUCKET et.al. is a suite of new messages that will
currently serve only for dumping of individual buckets of resilient next
hop groups. For nexthop group buckets, these messages will carry a nested
attribute NHA_RES_BUCKET, whose elements are attributes NHA_RES_BUCKET_*.
There are several reasons why a new suite of messages is created for
nexthop buckets instead of overloading the information on the existing
RTM_{NEW,DEL,GET}NEXTHOP messages.
First, a nexthop group can contain a large number of nexthop buckets (4k
is not unheard of). This imposes limits on the amount of information that
can be encoded for each nexthop bucket given a netlink message is limited
to 64k bytes.
Second, while RTM_NEWNEXTHOPBUCKET is only used for notifications at
this point, in the future it can be extended to provide user space with
control over nexthop buckets configuration.
- The new group type is NEXTHOP_GRP_TYPE_RES. Note that nexthop code is
adjusted to bounce groups with that type for now.
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
104 lines
2.8 KiB
C
104 lines
2.8 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, /* hash-threshold nexthop group
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* default type if not specified
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*/
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NEXTHOP_GRP_TYPE_RES, /* resilient nexthop group */
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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_FDB, /* flag; nexthop belongs to a bridge fdb */
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/* if NHA_FDB is added, OIF, BLACKHOLE, ENCAP cannot be set */
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/* nested; resilient nexthop group attributes */
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NHA_RES_GROUP,
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/* nested; nexthop bucket attributes */
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NHA_RES_BUCKET,
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__NHA_MAX,
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};
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#define NHA_MAX (__NHA_MAX - 1)
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enum {
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NHA_RES_GROUP_UNSPEC,
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/* Pad attribute for 64-bit alignment. */
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NHA_RES_GROUP_PAD = NHA_RES_GROUP_UNSPEC,
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/* u16; number of nexthop buckets in a resilient nexthop group */
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NHA_RES_GROUP_BUCKETS,
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/* clock_t as u32; nexthop bucket idle timer (per-group) */
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NHA_RES_GROUP_IDLE_TIMER,
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/* clock_t as u32; nexthop unbalanced timer */
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NHA_RES_GROUP_UNBALANCED_TIMER,
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/* clock_t as u64; nexthop unbalanced time */
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NHA_RES_GROUP_UNBALANCED_TIME,
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__NHA_RES_GROUP_MAX,
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};
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#define NHA_RES_GROUP_MAX (__NHA_RES_GROUP_MAX - 1)
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enum {
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NHA_RES_BUCKET_UNSPEC,
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/* Pad attribute for 64-bit alignment. */
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NHA_RES_BUCKET_PAD = NHA_RES_BUCKET_UNSPEC,
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/* u16; nexthop bucket index */
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NHA_RES_BUCKET_INDEX,
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/* clock_t as u64; nexthop bucket idle time */
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NHA_RES_BUCKET_IDLE_TIME,
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/* u32; nexthop id assigned to the nexthop bucket */
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NHA_RES_BUCKET_NH_ID,
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__NHA_RES_BUCKET_MAX,
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};
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#define NHA_RES_BUCKET_MAX (__NHA_RES_BUCKET_MAX - 1)
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#endif
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