2015-10-08 05:27:43 +08:00
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/* License: GPL */
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2011-12-06 15:59:52 +08:00
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#include <linux/mutex.h>
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#include <linux/socket.h>
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#include <linux/skbuff.h>
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#include <net/netlink.h>
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#include <net/net_namespace.h>
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#include <linux/module.h>
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2011-12-30 08:53:13 +08:00
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#include <net/sock.h>
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2015-06-15 23:26:18 +08:00
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#include <linux/kernel.h>
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#include <linux/tcp.h>
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#include <linux/workqueue.h>
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2011-12-06 15:59:52 +08:00
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#include <linux/inet_diag.h>
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#include <linux/sock_diag.h>
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2012-04-25 02:21:07 +08:00
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static const struct sock_diag_handler *sock_diag_handlers[AF_MAX];
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2011-12-06 15:59:52 +08:00
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static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh);
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static DEFINE_MUTEX(sock_diag_table_mutex);
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2015-06-15 23:26:18 +08:00
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static struct workqueue_struct *broadcast_wq;
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2011-12-06 15:59:52 +08:00
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2015-03-12 09:53:14 +08:00
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static u64 sock_gen_cookie(struct sock *sk)
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2011-12-15 10:43:44 +08:00
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{
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2015-03-12 09:53:14 +08:00
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while (1) {
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u64 res = atomic64_read(&sk->sk_cookie);
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if (res)
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return res;
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res = atomic64_inc_return(&sock_net(sk)->cookie_gen);
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atomic64_cmpxchg(&sk->sk_cookie, 0, res);
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}
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}
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int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie)
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{
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u64 res;
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if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE)
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2011-12-15 10:43:44 +08:00
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return 0;
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2015-03-12 09:53:14 +08:00
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res = sock_gen_cookie(sk);
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if ((u32)res != cookie[0] || (u32)(res >> 32) != cookie[1])
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return -ESTALE;
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return 0;
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2011-12-15 10:43:44 +08:00
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}
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EXPORT_SYMBOL_GPL(sock_diag_check_cookie);
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2015-03-12 09:53:14 +08:00
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void sock_diag_save_cookie(struct sock *sk, __u32 *cookie)
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2011-12-15 10:43:44 +08:00
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{
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2015-03-12 09:53:14 +08:00
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u64 res = sock_gen_cookie(sk);
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cookie[0] = (u32)res;
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cookie[1] = (u32)(res >> 32);
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2011-12-15 10:43:44 +08:00
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}
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EXPORT_SYMBOL_GPL(sock_diag_save_cookie);
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2011-12-30 08:53:13 +08:00
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int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype)
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{
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2012-06-27 07:36:11 +08:00
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u32 mem[SK_MEMINFO_VARS];
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2011-12-30 08:53:13 +08:00
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2017-03-21 03:22:03 +08:00
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sk_get_meminfo(sk, mem);
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2011-12-30 08:53:13 +08:00
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2012-06-27 07:36:11 +08:00
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return nla_put(skb, attrtype, sizeof(mem), &mem);
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2011-12-30 08:53:13 +08:00
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}
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EXPORT_SYMBOL_GPL(sock_diag_put_meminfo);
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2014-04-24 05:26:25 +08:00
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int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk,
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2013-04-25 14:53:54 +08:00
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struct sk_buff *skb, int attrtype)
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{
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net: filter: keep original BPF program around
In order to open up the possibility to internally transform a BPF program
into an alternative and possibly non-trivial reversible representation, we
need to keep the original BPF program around, so that it can be passed back
to user space w/o the need of a complex decoder.
The reason for that use case resides in commit a8fc92778080 ("sk-filter:
Add ability to get socket filter program (v2)"), that is, the ability
to retrieve the currently attached BPF filter from a given socket used
mainly by the checkpoint-restore project, for example.
Therefore, we add two helpers sk_{store,release}_orig_filter for taking
care of that. In the sk_unattached_filter_create() case, there's no such
possibility/requirement to retrieve a loaded BPF program. Therefore, we
can spare us the work in that case.
This approach will simplify and slightly speed up both, sk_get_filter()
and sock_diag_put_filterinfo() handlers as we won't need to successively
decode filters anymore through sk_decode_filter(). As we still need
sk_decode_filter() later on, we're keeping it around.
Joint work with Alexei Starovoitov.
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-03-29 01:58:19 +08:00
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struct sock_fprog_kern *fprog;
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2013-04-25 14:53:54 +08:00
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struct sk_filter *filter;
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net: filter: keep original BPF program around
In order to open up the possibility to internally transform a BPF program
into an alternative and possibly non-trivial reversible representation, we
need to keep the original BPF program around, so that it can be passed back
to user space w/o the need of a complex decoder.
The reason for that use case resides in commit a8fc92778080 ("sk-filter:
Add ability to get socket filter program (v2)"), that is, the ability
to retrieve the currently attached BPF filter from a given socket used
mainly by the checkpoint-restore project, for example.
Therefore, we add two helpers sk_{store,release}_orig_filter for taking
care of that. In the sk_unattached_filter_create() case, there's no such
possibility/requirement to retrieve a loaded BPF program. Therefore, we
can spare us the work in that case.
This approach will simplify and slightly speed up both, sk_get_filter()
and sock_diag_put_filterinfo() handlers as we won't need to successively
decode filters anymore through sk_decode_filter(). As we still need
sk_decode_filter() later on, we're keeping it around.
Joint work with Alexei Starovoitov.
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-03-29 01:58:19 +08:00
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struct nlattr *attr;
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unsigned int flen;
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2013-04-25 14:53:54 +08:00
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int err = 0;
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2014-04-24 05:26:25 +08:00
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if (!may_report_filterinfo) {
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2013-04-25 14:53:54 +08:00
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nla_reserve(skb, attrtype, 0);
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return 0;
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}
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rcu_read_lock();
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filter = rcu_dereference(sk->sk_filter);
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net: filter: keep original BPF program around
In order to open up the possibility to internally transform a BPF program
into an alternative and possibly non-trivial reversible representation, we
need to keep the original BPF program around, so that it can be passed back
to user space w/o the need of a complex decoder.
The reason for that use case resides in commit a8fc92778080 ("sk-filter:
Add ability to get socket filter program (v2)"), that is, the ability
to retrieve the currently attached BPF filter from a given socket used
mainly by the checkpoint-restore project, for example.
Therefore, we add two helpers sk_{store,release}_orig_filter for taking
care of that. In the sk_unattached_filter_create() case, there's no such
possibility/requirement to retrieve a loaded BPF program. Therefore, we
can spare us the work in that case.
This approach will simplify and slightly speed up both, sk_get_filter()
and sock_diag_put_filterinfo() handlers as we won't need to successively
decode filters anymore through sk_decode_filter(). As we still need
sk_decode_filter() later on, we're keeping it around.
Joint work with Alexei Starovoitov.
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-03-29 01:58:19 +08:00
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if (!filter)
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goto out;
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2013-04-25 14:53:54 +08:00
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net: filter: split 'struct sk_filter' into socket and bpf parts
clean up names related to socket filtering and bpf in the following way:
- everything that deals with sockets keeps 'sk_*' prefix
- everything that is pure BPF is changed to 'bpf_*' prefix
split 'struct sk_filter' into
struct sk_filter {
atomic_t refcnt;
struct rcu_head rcu;
struct bpf_prog *prog;
};
and
struct bpf_prog {
u32 jited:1,
len:31;
struct sock_fprog_kern *orig_prog;
unsigned int (*bpf_func)(const struct sk_buff *skb,
const struct bpf_insn *filter);
union {
struct sock_filter insns[0];
struct bpf_insn insnsi[0];
struct work_struct work;
};
};
so that 'struct bpf_prog' can be used independent of sockets and cleans up
'unattached' bpf use cases
split SK_RUN_FILTER macro into:
SK_RUN_FILTER to be used with 'struct sk_filter *' and
BPF_PROG_RUN to be used with 'struct bpf_prog *'
__sk_filter_release(struct sk_filter *) gains
__bpf_prog_release(struct bpf_prog *) helper function
also perform related renames for the functions that work
with 'struct bpf_prog *', since they're on the same lines:
sk_filter_size -> bpf_prog_size
sk_filter_select_runtime -> bpf_prog_select_runtime
sk_filter_free -> bpf_prog_free
sk_unattached_filter_create -> bpf_prog_create
sk_unattached_filter_destroy -> bpf_prog_destroy
sk_store_orig_filter -> bpf_prog_store_orig_filter
sk_release_orig_filter -> bpf_release_orig_filter
__sk_migrate_filter -> bpf_migrate_filter
__sk_prepare_filter -> bpf_prepare_filter
API for attaching classic BPF to a socket stays the same:
sk_attach_filter(prog, struct sock *)/sk_detach_filter(struct sock *)
and SK_RUN_FILTER(struct sk_filter *, ctx) to execute a program
which is used by sockets, tun, af_packet
API for 'unattached' BPF programs becomes:
bpf_prog_create(struct bpf_prog **)/bpf_prog_destroy(struct bpf_prog *)
and BPF_PROG_RUN(struct bpf_prog *, ctx) to execute a program
which is used by isdn, ppp, team, seccomp, ptp, xt_bpf, cls_bpf, test_bpf
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-07-31 11:34:16 +08:00
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fprog = filter->prog->orig_prog;
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2015-09-02 20:00:36 +08:00
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if (!fprog)
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goto out;
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2014-07-31 11:34:13 +08:00
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flen = bpf_classic_proglen(fprog);
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net: filter: keep original BPF program around
In order to open up the possibility to internally transform a BPF program
into an alternative and possibly non-trivial reversible representation, we
need to keep the original BPF program around, so that it can be passed back
to user space w/o the need of a complex decoder.
The reason for that use case resides in commit a8fc92778080 ("sk-filter:
Add ability to get socket filter program (v2)"), that is, the ability
to retrieve the currently attached BPF filter from a given socket used
mainly by the checkpoint-restore project, for example.
Therefore, we add two helpers sk_{store,release}_orig_filter for taking
care of that. In the sk_unattached_filter_create() case, there's no such
possibility/requirement to retrieve a loaded BPF program. Therefore, we
can spare us the work in that case.
This approach will simplify and slightly speed up both, sk_get_filter()
and sock_diag_put_filterinfo() handlers as we won't need to successively
decode filters anymore through sk_decode_filter(). As we still need
sk_decode_filter() later on, we're keeping it around.
Joint work with Alexei Starovoitov.
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-03-29 01:58:19 +08:00
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attr = nla_reserve(skb, attrtype, flen);
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2013-04-25 14:53:54 +08:00
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if (attr == NULL) {
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err = -EMSGSIZE;
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goto out;
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}
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net: filter: keep original BPF program around
In order to open up the possibility to internally transform a BPF program
into an alternative and possibly non-trivial reversible representation, we
need to keep the original BPF program around, so that it can be passed back
to user space w/o the need of a complex decoder.
The reason for that use case resides in commit a8fc92778080 ("sk-filter:
Add ability to get socket filter program (v2)"), that is, the ability
to retrieve the currently attached BPF filter from a given socket used
mainly by the checkpoint-restore project, for example.
Therefore, we add two helpers sk_{store,release}_orig_filter for taking
care of that. In the sk_unattached_filter_create() case, there's no such
possibility/requirement to retrieve a loaded BPF program. Therefore, we
can spare us the work in that case.
This approach will simplify and slightly speed up both, sk_get_filter()
and sock_diag_put_filterinfo() handlers as we won't need to successively
decode filters anymore through sk_decode_filter(). As we still need
sk_decode_filter() later on, we're keeping it around.
Joint work with Alexei Starovoitov.
Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-03-29 01:58:19 +08:00
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memcpy(nla_data(attr), fprog->filter, flen);
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2013-04-25 14:53:54 +08:00
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out:
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rcu_read_unlock();
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return err;
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}
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EXPORT_SYMBOL(sock_diag_put_filterinfo);
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2015-06-15 23:26:18 +08:00
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struct broadcast_sk {
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struct sock *sk;
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struct work_struct work;
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};
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static size_t sock_diag_nlmsg_size(void)
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{
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return NLMSG_ALIGN(sizeof(struct inet_diag_msg)
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+ nla_total_size(sizeof(u8)) /* INET_DIAG_PROTOCOL */
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2016-04-26 16:06:14 +08:00
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+ nla_total_size_64bit(sizeof(struct tcp_info))); /* INET_DIAG_INFO */
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2015-06-15 23:26:18 +08:00
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}
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static void sock_diag_broadcast_destroy_work(struct work_struct *work)
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{
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struct broadcast_sk *bsk =
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container_of(work, struct broadcast_sk, work);
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struct sock *sk = bsk->sk;
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const struct sock_diag_handler *hndl;
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struct sk_buff *skb;
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const enum sknetlink_groups group = sock_diag_destroy_group(sk);
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int err = -1;
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WARN_ON(group == SKNLGRP_NONE);
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skb = nlmsg_new(sock_diag_nlmsg_size(), GFP_KERNEL);
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if (!skb)
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goto out;
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mutex_lock(&sock_diag_table_mutex);
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hndl = sock_diag_handlers[sk->sk_family];
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if (hndl && hndl->get_info)
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err = hndl->get_info(skb, sk);
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mutex_unlock(&sock_diag_table_mutex);
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if (!err)
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nlmsg_multicast(sock_net(sk)->diag_nlsk, skb, 0, group,
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GFP_KERNEL);
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else
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kfree_skb(skb);
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out:
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sk_destruct(sk);
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kfree(bsk);
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}
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void sock_diag_broadcast_destroy(struct sock *sk)
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{
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/* Note, this function is often called from an interrupt context. */
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struct broadcast_sk *bsk =
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kmalloc(sizeof(struct broadcast_sk), GFP_ATOMIC);
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if (!bsk)
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return sk_destruct(sk);
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bsk->sk = sk;
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INIT_WORK(&bsk->work, sock_diag_broadcast_destroy_work);
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queue_work(broadcast_wq, &bsk->work);
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}
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2011-12-06 15:59:52 +08:00
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void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
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{
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mutex_lock(&sock_diag_table_mutex);
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inet_rcv_compat = fn;
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mutex_unlock(&sock_diag_table_mutex);
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}
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EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat);
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void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh))
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{
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mutex_lock(&sock_diag_table_mutex);
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inet_rcv_compat = NULL;
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mutex_unlock(&sock_diag_table_mutex);
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}
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EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat);
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2012-04-25 02:21:07 +08:00
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int sock_diag_register(const struct sock_diag_handler *hndl)
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2011-12-06 15:59:52 +08:00
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{
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int err = 0;
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2011-12-08 04:49:38 +08:00
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if (hndl->family >= AF_MAX)
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2011-12-06 15:59:52 +08:00
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return -EINVAL;
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mutex_lock(&sock_diag_table_mutex);
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if (sock_diag_handlers[hndl->family])
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err = -EBUSY;
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else
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sock_diag_handlers[hndl->family] = hndl;
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mutex_unlock(&sock_diag_table_mutex);
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return err;
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}
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EXPORT_SYMBOL_GPL(sock_diag_register);
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2012-04-25 02:21:07 +08:00
|
|
|
void sock_diag_unregister(const struct sock_diag_handler *hnld)
|
2011-12-06 15:59:52 +08:00
|
|
|
{
|
|
|
|
|
int family = hnld->family;
|
|
|
|
|
|
2011-12-08 04:49:38 +08:00
|
|
|
if (family >= AF_MAX)
|
2011-12-06 15:59:52 +08:00
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
mutex_lock(&sock_diag_table_mutex);
|
|
|
|
|
BUG_ON(sock_diag_handlers[family] != hnld);
|
|
|
|
|
sock_diag_handlers[family] = NULL;
|
|
|
|
|
mutex_unlock(&sock_diag_table_mutex);
|
|
|
|
|
}
|
|
|
|
|
EXPORT_SYMBOL_GPL(sock_diag_unregister);
|
|
|
|
|
|
2015-12-16 11:30:03 +08:00
|
|
|
static int __sock_diag_cmd(struct sk_buff *skb, struct nlmsghdr *nlh)
|
2011-12-06 15:59:52 +08:00
|
|
|
{
|
|
|
|
|
int err;
|
2012-06-27 07:36:11 +08:00
|
|
|
struct sock_diag_req *req = nlmsg_data(nlh);
|
2012-04-25 02:21:07 +08:00
|
|
|
const struct sock_diag_handler *hndl;
|
2011-12-06 15:59:52 +08:00
|
|
|
|
|
|
|
|
if (nlmsg_len(nlh) < sizeof(*req))
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
2013-02-23 09:13:47 +08:00
|
|
|
if (req->sdiag_family >= AF_MAX)
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
2013-02-23 09:13:48 +08:00
|
|
|
if (sock_diag_handlers[req->sdiag_family] == NULL)
|
|
|
|
|
request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
|
|
|
|
|
NETLINK_SOCK_DIAG, req->sdiag_family);
|
|
|
|
|
|
|
|
|
|
mutex_lock(&sock_diag_table_mutex);
|
|
|
|
|
hndl = sock_diag_handlers[req->sdiag_family];
|
2011-12-06 15:59:52 +08:00
|
|
|
if (hndl == NULL)
|
|
|
|
|
err = -ENOENT;
|
2015-12-16 11:30:03 +08:00
|
|
|
else if (nlh->nlmsg_type == SOCK_DIAG_BY_FAMILY)
|
2011-12-06 15:59:52 +08:00
|
|
|
err = hndl->dump(skb, nlh);
|
2015-12-16 11:30:03 +08:00
|
|
|
else if (nlh->nlmsg_type == SOCK_DESTROY && hndl->destroy)
|
|
|
|
|
err = hndl->destroy(skb, nlh);
|
|
|
|
|
else
|
|
|
|
|
err = -EOPNOTSUPP;
|
2013-02-23 09:13:48 +08:00
|
|
|
mutex_unlock(&sock_diag_table_mutex);
|
2011-12-06 15:59:52 +08:00
|
|
|
|
|
|
|
|
return err;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
|
|
|
{
|
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
|
|
switch (nlh->nlmsg_type) {
|
|
|
|
|
case TCPDIAG_GETSOCK:
|
|
|
|
|
case DCCPDIAG_GETSOCK:
|
|
|
|
|
if (inet_rcv_compat == NULL)
|
|
|
|
|
request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
|
2011-12-15 10:43:27 +08:00
|
|
|
NETLINK_SOCK_DIAG, AF_INET);
|
2011-12-06 15:59:52 +08:00
|
|
|
|
|
|
|
|
mutex_lock(&sock_diag_table_mutex);
|
|
|
|
|
if (inet_rcv_compat != NULL)
|
|
|
|
|
ret = inet_rcv_compat(skb, nlh);
|
|
|
|
|
else
|
|
|
|
|
ret = -EOPNOTSUPP;
|
|
|
|
|
mutex_unlock(&sock_diag_table_mutex);
|
|
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
|
case SOCK_DIAG_BY_FAMILY:
|
2015-12-16 11:30:03 +08:00
|
|
|
case SOCK_DESTROY:
|
|
|
|
|
return __sock_diag_cmd(skb, nlh);
|
2011-12-06 15:59:52 +08:00
|
|
|
default:
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static DEFINE_MUTEX(sock_diag_mutex);
|
|
|
|
|
|
|
|
|
|
static void sock_diag_rcv(struct sk_buff *skb)
|
|
|
|
|
{
|
|
|
|
|
mutex_lock(&sock_diag_mutex);
|
|
|
|
|
netlink_rcv_skb(skb, &sock_diag_rcv_msg);
|
|
|
|
|
mutex_unlock(&sock_diag_mutex);
|
|
|
|
|
}
|
|
|
|
|
|
2015-06-15 23:26:18 +08:00
|
|
|
static int sock_diag_bind(struct net *net, int group)
|
|
|
|
|
{
|
|
|
|
|
switch (group) {
|
|
|
|
|
case SKNLGRP_INET_TCP_DESTROY:
|
|
|
|
|
case SKNLGRP_INET_UDP_DESTROY:
|
|
|
|
|
if (!sock_diag_handlers[AF_INET])
|
|
|
|
|
request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
|
|
|
|
|
NETLINK_SOCK_DIAG, AF_INET);
|
|
|
|
|
break;
|
|
|
|
|
case SKNLGRP_INET6_TCP_DESTROY:
|
|
|
|
|
case SKNLGRP_INET6_UDP_DESTROY:
|
|
|
|
|
if (!sock_diag_handlers[AF_INET6])
|
|
|
|
|
request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
|
|
|
|
|
NETLINK_SOCK_DIAG, AF_INET);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2015-12-16 11:30:03 +08:00
|
|
|
int sock_diag_destroy(struct sock *sk, int err)
|
|
|
|
|
{
|
|
|
|
|
if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
|
|
|
|
|
return -EPERM;
|
|
|
|
|
|
|
|
|
|
if (!sk->sk_prot->diag_destroy)
|
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
|
|
|
|
|
|
return sk->sk_prot->diag_destroy(sk, err);
|
|
|
|
|
}
|
|
|
|
|
EXPORT_SYMBOL_GPL(sock_diag_destroy);
|
|
|
|
|
|
2012-07-16 12:28:49 +08:00
|
|
|
static int __net_init diag_net_init(struct net *net)
|
2011-12-06 15:59:52 +08:00
|
|
|
{
|
2012-06-29 14:15:21 +08:00
|
|
|
struct netlink_kernel_cfg cfg = {
|
2015-06-15 23:26:18 +08:00
|
|
|
.groups = SKNLGRP_MAX,
|
2012-06-29 14:15:21 +08:00
|
|
|
.input = sock_diag_rcv,
|
2015-06-15 23:26:18 +08:00
|
|
|
.bind = sock_diag_bind,
|
|
|
|
|
.flags = NL_CFG_F_NONROOT_RECV,
|
2012-06-29 14:15:21 +08:00
|
|
|
};
|
|
|
|
|
|
2012-09-08 10:53:54 +08:00
|
|
|
net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg);
|
2012-07-16 12:28:49 +08:00
|
|
|
return net->diag_nlsk == NULL ? -ENOMEM : 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void __net_exit diag_net_exit(struct net *net)
|
|
|
|
|
{
|
|
|
|
|
netlink_kernel_release(net->diag_nlsk);
|
|
|
|
|
net->diag_nlsk = NULL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static struct pernet_operations diag_net_ops = {
|
|
|
|
|
.init = diag_net_init,
|
|
|
|
|
.exit = diag_net_exit,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static int __init sock_diag_init(void)
|
|
|
|
|
{
|
2015-06-15 23:26:18 +08:00
|
|
|
broadcast_wq = alloc_workqueue("sock_diag_events", 0, 0);
|
|
|
|
|
BUG_ON(!broadcast_wq);
|
2012-07-16 12:28:49 +08:00
|
|
|
return register_pernet_subsys(&diag_net_ops);
|
2011-12-06 15:59:52 +08:00
|
|
|
}
|
2015-10-08 05:27:43 +08:00
|
|
|
device_initcall(sock_diag_init);
|