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Diffstat (limited to 'include/net/mctp.h')
-rw-r--r-- | include/net/mctp.h | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/include/net/mctp.h b/include/net/mctp.h new file mode 100644 index 000000000000..7e35ec79b909 --- /dev/null +++ b/include/net/mctp.h @@ -0,0 +1,276 @@ +/* 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 <linux/netdevice.h> +#include <net/net_namespace.h> +#include <net/sock.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 + +#define MCTP_INITIAL_DEFAULT_NET 1 + +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); +} + +/* socket implementation */ +struct mctp_sock { + struct sock sk; + + /* bind() params */ + unsigned int bind_net; + mctp_eid_t bind_addr; + __u8 bind_type; + + /* sendmsg()/recvmsg() uses struct sockaddr_mctp_ext */ + bool addr_ext; + + /* list of mctp_sk_key, for incoming tag lookup. updates protected + * by sk->net->keys_lock + */ + struct hlist_head keys; + + /* mechanism for expiring allocated keys; will release an allocated + * tag, and any netdev state for a request/response pairing + */ + struct timer_list key_expiry; +}; + +/* Key for matching incoming packets to sockets or reassembly contexts. + * Packets are matched on (src,dest,tag). + * + * Lifetime / locking requirements: + * + * - individual key data (ie, the struct itself) is protected by key->lock; + * changes must be made with that lock held. + * + * - the lookup fields: peer_addr, local_addr and tag are set before the + * key is added to lookup lists, and never updated. + * + * - A ref to the key must be held (throuh key->refs) if a pointer to the + * key is to be accessed after key->lock is released. + * + * - a mctp_sk_key contains a reference to a struct sock; this is valid + * for the life of the key. On sock destruction (through unhash), the key is + * removed from lists (see below), and marked invalid. + * + * - these mctp_sk_keys appear on two lists: + * 1) the struct mctp_sock->keys list + * 2) the struct netns_mctp->keys list + * + * presences on these lists requires a (single) refcount to be held; both + * lists are updated as a single operation. + * + * Updates and lookups in either list are performed under the + * netns_mctp->keys lock. Lookup functions will need to lock the key and + * take a reference before unlocking the keys_lock. Consequently, the list's + * keys_lock *cannot* be acquired with the individual key->lock held. + * + * - a key may have a sk_buff attached as part of an in-progress message + * reassembly (->reasm_head). The reasm data is protected by the individual + * key->lock. + * + * - there are two destruction paths for a mctp_sk_key: + * + * - through socket unhash (see mctp_sk_unhash). This performs the list + * removal under keys_lock. + * + * - where a key is established to receive a reply message: after receiving + * the (complete) reply, or during reassembly errors. Here, we clean up + * the reassembly context (marking reasm_dead, to prevent another from + * starting), and remove the socket from the netns & socket lists. + * + * - through an expiry timeout, on a per-socket timer + */ +struct mctp_sk_key { + mctp_eid_t peer_addr; + mctp_eid_t local_addr; + __u8 tag; /* incoming tag match; invert TO for local */ + + /* we hold a ref to sk when set */ + struct sock *sk; + + /* routing lookup list */ + struct hlist_node hlist; + + /* per-socket list */ + struct hlist_node sklist; + + /* lock protects against concurrent updates to the reassembly and + * expiry data below. + */ + spinlock_t lock; + + /* Keys are referenced during the output path, which may sleep */ + refcount_t refs; + + /* incoming fragment reassembly context */ + struct sk_buff *reasm_head; + struct sk_buff **reasm_tailp; + bool reasm_dead; + u8 last_seq; + + /* key validity */ + bool valid; + + /* expiry timeout; valid (above) cleared on expiry */ + unsigned long expiry; + + /* free to use for device flow state tracking. Initialised to + * zero on initial key creation + */ + unsigned long dev_flow_state; + struct mctp_dev *dev; +}; + +struct mctp_skb_cb { + unsigned int magic; + unsigned int net; + int ifindex; /* extended/direct addressing if set */ + mctp_eid_t src; + unsigned char halen; + unsigned char haddr[MAX_ADDR_LEN]; +}; + +/* 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; + + BUILD_BUG_ON(sizeof(struct mctp_skb_cb) > sizeof(skb->cb)); + WARN_ON(cb->magic != 0x4d435450); + return (void *)(skb->cb); +} + +/* If CONFIG_MCTP_FLOWS, we may add one of these as a SKB extension, + * indicating the flow to the device driver. + */ +struct mctp_flow { + struct mctp_sk_key *key; +}; + +/* 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 mctp_route_release() + */ +struct mctp_route { + mctp_eid_t min, max; + + struct mctp_dev *dev; + unsigned int mtu; + unsigned char type; + 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_local_output(struct sock *sk, struct mctp_route *rt, + struct sk_buff *skb, mctp_eid_t daddr, u8 req_tag); + +void mctp_key_unref(struct mctp_sk_key *key); + +/* 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 */ |