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Code Editor : mctp.h
/* 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> #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; /* list of mctp_sk_key, for incoming tag lookup. updates protected * by sk->net->keys_lock */ struct hlist_head keys; }; /* Key for matching incoming packets to sockets or reassembly contexts. * Packets are matched on (src,dest,tag). * * Lifetime requirements: * * - keys are free()ed via RCU * * - 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 will not be observable after a RCU * grace period. * * any RX occurring within that grace period may still queue to the socket, * but will hit the SOCK_DEAD case before the socket is freed. * * - these mctp_sk_keys appear on two lists: * 1) the struct mctp_sock->keys list * 2) the struct netns_mctp->keys list * * updates to either list are performed under the netns_mctp->keys * lock. * * - a key may have a sk_buff attached as part of an in-progress message * reassembly (->reasm_head). The reassembly context is protected by * reasm_lock, which may be acquired with the keys lock (above) held, if * necessary. Consequently, keys lock *cannot* be acquired with the * reasm_lock held. * * - 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. */ 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; /* incoming fragment reassembly context */ spinlock_t reasm_lock; struct sk_buff *reasm_head; struct sk_buff **reasm_tailp; bool reasm_dead; u8 last_seq; struct rcu_head rcu; }; 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; 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_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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