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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Management Component Transport Protocol (MCTP)
*
* Copyright (c) 2021 Code Construct
* Copyright (c) 2021 Google
*/
#ifndef __NET_MCTP_H
#define __NET_MCTP_H
#include <linux/bits.h>
#include <linux/mctp.h>
#include <net/net_namespace.h>
/* MCTP packet definitions */
struct mctp_hdr {
u8 ver;
u8 dest;
u8 src;
u8 flags_seq_tag;
};
#define MCTP_VER_MIN 1
#define MCTP_VER_MAX 1
/* Definitions for flags_seq_tag field */
#define MCTP_HDR_FLAG_SOM BIT(7)
#define MCTP_HDR_FLAG_EOM BIT(6)
#define MCTP_HDR_FLAG_TO BIT(3)
#define MCTP_HDR_FLAGS GENMASK(5, 3)
#define MCTP_HDR_SEQ_SHIFT 4
#define MCTP_HDR_SEQ_MASK GENMASK(1, 0)
#define MCTP_HDR_TAG_SHIFT 0
#define MCTP_HDR_TAG_MASK GENMASK(2, 0)
#define MCTP_HEADER_MAXLEN 4
static inline bool mctp_address_ok(mctp_eid_t eid)
{
return eid >= 8 && eid < 255;
}
static inline struct mctp_hdr *mctp_hdr(struct sk_buff *skb)
{
return (struct mctp_hdr *)skb_network_header(skb);
}
struct mctp_skb_cb {
unsigned int magic;
unsigned int net;
mctp_eid_t src;
};
/* skb control-block accessors with a little extra debugging for initial
* development.
*
* TODO: remove checks & mctp_skb_cb->magic; replace callers of __mctp_cb
* with mctp_cb().
*
* __mctp_cb() is only for the initial ingress code; we should see ->magic set
* at all times after this.
*/
static inline struct mctp_skb_cb *__mctp_cb(struct sk_buff *skb)
{
struct mctp_skb_cb *cb = (void *)skb->cb;
cb->magic = 0x4d435450;
return cb;
}
static inline struct mctp_skb_cb *mctp_cb(struct sk_buff *skb)
{
struct mctp_skb_cb *cb = (void *)skb->cb;
WARN_ON(cb->magic != 0x4d435450);
return (void *)(skb->cb);
}
/* Route definition.
*
* These are held in the pernet->mctp.routes list, with RCU protection for
* removed routes. We hold a reference to the netdev; routes need to be
* dropped on NETDEV_UNREGISTER events.
*
* Updates to the route table are performed under rtnl; all reads under RCU,
* so routes cannot be referenced over a RCU grace period. Specifically: A
* caller cannot block between mctp_route_lookup and passing the route to
* mctp_do_route.
*/
struct mctp_route {
mctp_eid_t min, max;
struct mctp_dev *dev;
unsigned int mtu;
int (*output)(struct mctp_route *route,
struct sk_buff *skb);
struct list_head list;
refcount_t refs;
struct rcu_head rcu;
};
/* route interfaces */
struct mctp_route *mctp_route_lookup(struct net *net, unsigned int dnet,
mctp_eid_t daddr);
int mctp_do_route(struct mctp_route *rt, struct sk_buff *skb);
int mctp_local_output(struct sock *sk, struct mctp_route *rt,
struct sk_buff *skb, mctp_eid_t daddr, u8 req_tag);
/* routing <--> device interface */
unsigned int mctp_default_net(struct net *net);
int mctp_default_net_set(struct net *net, unsigned int index);
int mctp_route_add_local(struct mctp_dev *mdev, mctp_eid_t addr);
int mctp_route_remove_local(struct mctp_dev *mdev, mctp_eid_t addr);
void mctp_route_remove_dev(struct mctp_dev *mdev);
/* neighbour definitions */
enum mctp_neigh_source {
MCTP_NEIGH_STATIC,
MCTP_NEIGH_DISCOVER,
};
struct mctp_neigh {
struct mctp_dev *dev;
mctp_eid_t eid;
enum mctp_neigh_source source;
unsigned char ha[MAX_ADDR_LEN];
struct list_head list;
struct rcu_head rcu;
};
int mctp_neigh_init(void);
void mctp_neigh_exit(void);
// ret_hwaddr may be NULL, otherwise must have space for MAX_ADDR_LEN
int mctp_neigh_lookup(struct mctp_dev *dev, mctp_eid_t eid,
void *ret_hwaddr);
void mctp_neigh_remove_dev(struct mctp_dev *mdev);
int mctp_routes_init(void);
void mctp_routes_exit(void);
void mctp_device_init(void);
void mctp_device_exit(void);
#endif /* __NET_MCTP_H */
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