da12c90e09
As we know, netlink sockets are private resource of net namespace, they can communicate with each other only when they in the same net namespace. this works well until we try to add namespace support for other subsystems which use netlink. Don't like ipv4 and route table.., it is not suited to make these subsytems belong to net namespace, Such as audit and crypto subsystems,they are more suitable to user namespace. So we must have the ability to make the netlink sockets in same user namespace can communicate with each other. This patch adds a new function pointer "compare" for netlink_table, we can decide if the netlink sockets can communicate with each other through this netlink_table self-defined compare function. The behavior isn't changed if we don't provide the compare function for netlink_table. Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
84 lines
1.7 KiB
C
84 lines
1.7 KiB
C
#ifndef _AF_NETLINK_H
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#define _AF_NETLINK_H
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#include <net/sock.h>
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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_ring {
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void **pg_vec;
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unsigned int head;
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unsigned int frames_per_block;
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unsigned int frame_size;
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unsigned int frame_max;
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unsigned int pg_vec_order;
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unsigned int pg_vec_pages;
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unsigned int pg_vec_len;
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atomic_t pending;
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};
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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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u32 portid;
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u32 dst_portid;
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u32 dst_group;
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u32 flags;
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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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wait_queue_head_t wait;
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struct netlink_callback *cb;
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struct mutex *cb_mutex;
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struct mutex cb_def_mutex;
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void (*netlink_rcv)(struct sk_buff *skb);
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void (*netlink_bind)(int group);
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struct module *module;
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#ifdef CONFIG_NETLINK_MMAP
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struct mutex pg_vec_lock;
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struct netlink_ring rx_ring;
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struct netlink_ring tx_ring;
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atomic_t mapped;
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#endif /* CONFIG_NETLINK_MMAP */
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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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struct nl_portid_hash {
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struct hlist_head *table;
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unsigned long rehash_time;
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unsigned int mask;
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unsigned int shift;
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unsigned int entries;
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unsigned int max_shift;
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u32 rnd;
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};
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struct netlink_table {
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struct nl_portid_hash 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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void (*bind)(int group);
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bool (*compare)(struct net *net, struct sock *sock);
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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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