forked from mirrors/linux
1036908045
Commit 0091bfc817 ("io_uring/af_unix: defer registered
files gc to io_uring release") added one bit to struct sk_buff.
This structure is critical for networking, and we try very hard
to not add bloat on it, unless absolutely required.
For instance, we can use a specific destructor as a wrapper
around unix_destruct_scm(), to identify skbs that unix_gc()
has to special case.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Pavel Begunkov <asml.silence@gmail.com>
Cc: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Cc: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Jens Axboe <axboe@kernel.dk>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
110 lines
2.9 KiB
C
110 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __LINUX_NET_AFUNIX_H
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#define __LINUX_NET_AFUNIX_H
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#include <linux/socket.h>
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#include <linux/un.h>
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#include <linux/mutex.h>
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#include <linux/refcount.h>
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#include <net/sock.h>
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void unix_inflight(struct user_struct *user, struct file *fp);
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void unix_notinflight(struct user_struct *user, struct file *fp);
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void unix_destruct_scm(struct sk_buff *skb);
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void io_uring_destruct_scm(struct sk_buff *skb);
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void unix_gc(void);
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void wait_for_unix_gc(void);
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struct sock *unix_get_socket(struct file *filp);
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struct sock *unix_peer_get(struct sock *sk);
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#define UNIX_HASH_MOD (256 - 1)
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#define UNIX_HASH_SIZE (256 * 2)
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#define UNIX_HASH_BITS 8
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extern unsigned int unix_tot_inflight;
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struct unix_address {
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refcount_t refcnt;
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int len;
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struct sockaddr_un name[];
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};
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struct unix_skb_parms {
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struct pid *pid; /* Skb credentials */
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kuid_t uid;
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kgid_t gid;
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struct scm_fp_list *fp; /* Passed files */
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#ifdef CONFIG_SECURITY_NETWORK
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u32 secid; /* Security ID */
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#endif
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u32 consumed;
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} __randomize_layout;
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struct scm_stat {
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atomic_t nr_fds;
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};
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#define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb))
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#define unix_state_lock(s) spin_lock(&unix_sk(s)->lock)
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#define unix_state_unlock(s) spin_unlock(&unix_sk(s)->lock)
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#define unix_state_lock_nested(s) \
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spin_lock_nested(&unix_sk(s)->lock, \
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SINGLE_DEPTH_NESTING)
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/* The AF_UNIX socket */
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struct unix_sock {
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/* WARNING: sk has to be the first member */
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struct sock sk;
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struct unix_address *addr;
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struct path path;
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struct mutex iolock, bindlock;
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struct sock *peer;
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struct list_head link;
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atomic_long_t inflight;
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spinlock_t lock;
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unsigned long gc_flags;
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#define UNIX_GC_CANDIDATE 0
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#define UNIX_GC_MAYBE_CYCLE 1
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struct socket_wq peer_wq;
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wait_queue_entry_t peer_wake;
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struct scm_stat scm_stat;
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#if IS_ENABLED(CONFIG_AF_UNIX_OOB)
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struct sk_buff *oob_skb;
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#endif
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};
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static inline struct unix_sock *unix_sk(const struct sock *sk)
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{
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return (struct unix_sock *)sk;
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}
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#define peer_wait peer_wq.wait
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long unix_inq_len(struct sock *sk);
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long unix_outq_len(struct sock *sk);
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int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
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int flags);
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int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size,
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int flags);
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#ifdef CONFIG_SYSCTL
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int unix_sysctl_register(struct net *net);
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void unix_sysctl_unregister(struct net *net);
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#else
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static inline int unix_sysctl_register(struct net *net) { return 0; }
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static inline void unix_sysctl_unregister(struct net *net) {}
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#endif
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#ifdef CONFIG_BPF_SYSCALL
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extern struct proto unix_dgram_proto;
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extern struct proto unix_stream_proto;
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int unix_dgram_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
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int unix_stream_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
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void __init unix_bpf_build_proto(void);
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#else
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static inline void __init unix_bpf_build_proto(void)
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{}
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#endif
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#endif
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