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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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ad39c12fce
This change allows for gateway routing, where a route table entry
may reference a routable endpoint (by network and EID), instead of
routing directly to a netdevice.
We add support for a RTM_GATEWAY attribute for netlink route updates,
with an attribute format of:
struct mctp_fq_addr {
unsigned int net;
mctp_eid_t eid;
}
- we need the net here to uniquely identify the target EID, as we no
longer have the device reference directly (which would provide the net
id in the case of direct routes).
This makes route lookups recursive, as a route lookup that returns a
gateway route must be resolved into a direct route (ie, to a device)
eventually. We provide a limit to the route lookups, to prevent infinite
loop routing.
The route lookup populates a new 'nexthop' field in the dst structure,
which now specifies the key for the neighbour table lookup on device
output, rather than using the packet destination address directly.
Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Link: https://patch.msgid.link/20250702-dev-forwarding-v5-13-1468191da8a4@codeconstruct.com.au
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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/*
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* Management Component Transport Protocol (MCTP)
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*
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* Copyright (c) 2021 Code Construct
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* Copyright (c) 2021 Google
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*/
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#ifndef __UAPI_MCTP_H
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#define __UAPI_MCTP_H
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/netdevice.h>
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typedef __u8 mctp_eid_t;
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struct mctp_addr {
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mctp_eid_t s_addr;
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};
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struct sockaddr_mctp {
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__kernel_sa_family_t smctp_family;
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__u16 __smctp_pad0;
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unsigned int smctp_network;
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struct mctp_addr smctp_addr;
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__u8 smctp_type;
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__u8 smctp_tag;
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__u8 __smctp_pad1;
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};
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struct sockaddr_mctp_ext {
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struct sockaddr_mctp smctp_base;
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int smctp_ifindex;
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__u8 smctp_halen;
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__u8 __smctp_pad0[3];
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__u8 smctp_haddr[MAX_ADDR_LEN];
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};
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/* A "fully qualified" MCTP address, which includes the system-local network ID,
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* required to uniquely resolve a routable EID.
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*/
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struct mctp_fq_addr {
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unsigned int net;
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mctp_eid_t eid;
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};
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#define MCTP_NET_ANY 0x0
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#define MCTP_ADDR_NULL 0x00
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#define MCTP_ADDR_ANY 0xff
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#define MCTP_TAG_MASK 0x07
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#define MCTP_TAG_OWNER 0x08
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#define MCTP_TAG_PREALLOC 0x10
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#define MCTP_OPT_ADDR_EXT 1
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#define SIOCMCTPALLOCTAG (SIOCPROTOPRIVATE + 0)
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#define SIOCMCTPDROPTAG (SIOCPROTOPRIVATE + 1)
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#define SIOCMCTPALLOCTAG2 (SIOCPROTOPRIVATE + 2)
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#define SIOCMCTPDROPTAG2 (SIOCPROTOPRIVATE + 3)
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/* Deprecated: use mctp_ioc_tag_ctl2 / TAG2 ioctls instead, which defines the
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* MCTP network ID as part of the allocated tag. Using this assumes the default
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* net ID for allocated tags, which may not give correct behaviour on system
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* with multiple networks configured.
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*/
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struct mctp_ioc_tag_ctl {
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mctp_eid_t peer_addr;
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/* For SIOCMCTPALLOCTAG: must be passed as zero, kernel will
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* populate with the allocated tag value. Returned tag value will
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* always have TO and PREALLOC set.
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*
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* For SIOCMCTPDROPTAG: userspace provides tag value to drop, from
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* a prior SIOCMCTPALLOCTAG call (and so must have TO and PREALLOC set).
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*/
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__u8 tag;
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__u16 flags;
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};
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struct mctp_ioc_tag_ctl2 {
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/* Peer details: network ID, peer EID, local EID. All set by the
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* caller.
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*
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* Local EID must be MCTP_ADDR_NULL or MCTP_ADDR_ANY in current
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* kernels.
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*/
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unsigned int net;
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mctp_eid_t peer_addr;
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mctp_eid_t local_addr;
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/* Set by caller, but no flags defined currently. Must be 0 */
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__u16 flags;
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/* For SIOCMCTPALLOCTAG2: must be passed as zero, kernel will
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* populate with the allocated tag value. Returned tag value will
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* always have TO and PREALLOC set.
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*
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* For SIOCMCTPDROPTAG2: userspace provides tag value to drop, from
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* a prior SIOCMCTPALLOCTAG2 call (and so must have TO and PREALLOC set).
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*/
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__u8 tag;
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};
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#endif /* __UAPI_MCTP_H */
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