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da8fc7a39b
We have been triggering GC on every close() if there is even one
inflight AF_UNIX socket.
This is because the old GC implementation had no idea of the graph
shape formed by SCM_RIGHTS references.
The new GC knows whether there could be a cyclic reference or not,
and we can do better.
Let's not trigger GC from close() if there is no cyclic reference
or GC is already in progress.
While at it, unix_gc() is renamed to unix_schedule_gc() as it does
not actually perform GC since commit 8b90a9f819 ("af_unix: Run
GC on only one CPU.").
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20251115020935.2643121-4-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
72 lines
1.8 KiB
C
72 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __AF_UNIX_H
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#define __AF_UNIX_H
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#include <linux/uidgid.h>
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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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struct sock *unix_peer_get(struct sock *sk);
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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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#define UNIXCB(skb) (*(struct unix_skb_parms *)&((skb)->cb))
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/* GC for SCM_RIGHTS */
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void unix_add_edges(struct scm_fp_list *fpl, struct unix_sock *receiver);
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void unix_del_edges(struct scm_fp_list *fpl);
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void unix_update_edges(struct unix_sock *receiver);
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int unix_prepare_fpl(struct scm_fp_list *fpl);
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void unix_destroy_fpl(struct scm_fp_list *fpl);
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void unix_schedule_gc(void);
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void wait_for_unix_gc(struct scm_fp_list *fpl);
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/* SOCK_DIAG */
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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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/* sysctl */
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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)
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{
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return 0;
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}
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static inline void unix_sysctl_unregister(struct net *net)
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{
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}
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#endif
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/* BPF SOCKMAP */
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int __unix_dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, int flags);
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int __unix_stream_recvmsg(struct sock *sk, struct msghdr *msg, size_t size, int flags);
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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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}
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#endif
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#endif
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