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https://github.com/torvalds/linux
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e39951d965
In commit af65bdfce9 ("[NETLINK]: Switch cb_lock spinlock
to mutex and allow to override it"), Patrick McHardy used
a common mutex to protect both nlk->cb and the dump() operations.
The override is used for rtnl dumps, registered with
rntl_register() and rntl_register_module().
We want to be able to opt-out some dump() operations
to not acquire RTNL, so we need to protect nlk->cb
with a per socket mutex.
This patch renames nlk->cb_def_mutex to nlk->nl_cb_mutex
The optional pointer to the mutex used to protect dump()
call is stored in nlk->dump_cb_mutex
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
83 lines
2 KiB
C
83 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _AF_NETLINK_H
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#define _AF_NETLINK_H
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#include <linux/rhashtable.h>
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#include <linux/atomic.h>
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#include <linux/workqueue.h>
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#include <net/sock.h>
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/* flags */
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enum {
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NETLINK_F_KERNEL_SOCKET,
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NETLINK_F_RECV_PKTINFO,
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NETLINK_F_BROADCAST_SEND_ERROR,
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NETLINK_F_RECV_NO_ENOBUFS,
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NETLINK_F_LISTEN_ALL_NSID,
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NETLINK_F_CAP_ACK,
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NETLINK_F_EXT_ACK,
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NETLINK_F_STRICT_CHK,
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};
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#define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8)
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#define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long))
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struct netlink_sock {
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/* struct sock has to be the first member of netlink_sock */
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struct sock sk;
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unsigned long flags;
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u32 portid;
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u32 dst_portid;
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u32 dst_group;
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u32 subscriptions;
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u32 ngroups;
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unsigned long *groups;
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unsigned long state;
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size_t max_recvmsg_len;
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wait_queue_head_t wait;
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bool bound;
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bool cb_running;
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int dump_done_errno;
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struct netlink_callback cb;
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struct mutex nl_cb_mutex;
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struct mutex *dump_cb_mutex;
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void (*netlink_rcv)(struct sk_buff *skb);
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int (*netlink_bind)(struct net *net, int group);
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void (*netlink_unbind)(struct net *net, int group);
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void (*netlink_release)(struct sock *sk,
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unsigned long *groups);
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struct module *module;
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struct rhash_head node;
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struct rcu_head rcu;
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struct work_struct work;
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};
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static inline struct netlink_sock *nlk_sk(struct sock *sk)
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{
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return container_of(sk, struct netlink_sock, sk);
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}
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#define nlk_test_bit(nr, sk) test_bit(NETLINK_F_##nr, &nlk_sk(sk)->flags)
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struct netlink_table {
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struct rhashtable hash;
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struct hlist_head mc_list;
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struct listeners __rcu *listeners;
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unsigned int flags;
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unsigned int groups;
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struct mutex *cb_mutex;
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struct module *module;
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int (*bind)(struct net *net, int group);
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void (*unbind)(struct net *net, int group);
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void (*release)(struct sock *sk,
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unsigned long *groups);
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int registered;
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};
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extern struct netlink_table *nl_table;
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extern rwlock_t nl_table_lock;
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#endif
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