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[NETLINK]: Support dynamic number of multicast groups per netlink family 

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2005-08-15 12:29:13 -07:00 committed by David S. Miller
parent ab33a1711c
commit f7fa9b10ed
1 changed files with 52 additions and 19 deletions
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71
net/netlink/af_netlink.c
View File

@ -60,21 +60,24 @@
#include <net/scm.h>
#define Nprintk(a...)
#define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8)
struct netlink_sock {
/* struct sock has to be the first member of netlink_sock */
struct sock sk;
u32 pid;
unsigned int groups;
u32 dst_pid;
u32 dst_group;
u32 flags;
u32 subscriptions;
u32 ngroups;
unsigned long *groups;
unsigned long state;
wait_queue_head_t wait;
struct netlink_callback *cb;
spinlock_t cb_lock;
void (*data_ready)(struct sock *sk, int bytes);
struct module *module;
u32 flags;
};
#define NETLINK_KERNEL_SOCKET 0x1
@ -101,6 +104,7 @@ struct netlink_table {
struct nl_pid_hash hash;
struct hlist_head mc_list;
unsigned int nl_nonroot;
unsigned int groups;
struct module *module;
int registered;
};
@ -138,6 +142,7 @@ static void netlink_sock_destruct(struct sock *sk)
BUG_TRAP(!atomic_read(&sk->sk_rmem_alloc));
BUG_TRAP(!atomic_read(&sk->sk_wmem_alloc));
BUG_TRAP(!nlk_sk(sk)->cb);
BUG_TRAP(!nlk_sk(sk)->groups);
}
/* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on SMP.
@ -333,7 +338,7 @@ static void netlink_remove(struct sock *sk)
netlink_table_grab();
if (sk_del_node_init(sk))
nl_table[sk->sk_protocol].hash.entries--;
if (nlk_sk(sk)->groups)
if (nlk_sk(sk)->subscriptions)
__sk_del_bind_node(sk);
netlink_table_ungrab();
}
@ -369,6 +374,8 @@ static int __netlink_create(struct socket *sock, int protocol)
static int netlink_create(struct socket *sock, int protocol)
{
struct module *module = NULL;
struct netlink_sock *nlk;
unsigned int groups;
int err = 0;
sock->state = SS_UNCONNECTED;
@ -392,15 +399,23 @@ static int netlink_create(struct socket *sock, int protocol)
module = nl_table[protocol].module;
else
err = -EPROTONOSUPPORT;
groups = nl_table[protocol].groups;
netlink_unlock_table();
if (err)
goto out;
if ((err = __netlink_create(sock, protocol) < 0))
if (err || (err = __netlink_create(sock, protocol) < 0))
goto out_module;
nlk_sk(sock->sk)->module = module;
nlk = nlk_sk(sock->sk);
nlk->groups = kmalloc(NLGRPSZ(groups), GFP_KERNEL);
if (nlk->groups == NULL) {
err = -ENOMEM;
goto out_module;
}
memset(nlk->groups, 0, NLGRPSZ(groups));
nlk->ngroups = groups;
nlk->module = module;
out:
return err;
@ -437,7 +452,7 @@ static int netlink_release(struct socket *sock)
skb_queue_purge(&sk->sk_write_queue);
if (nlk->pid && !nlk->groups) {
if (nlk->pid && !nlk->subscriptions) {
struct netlink_notify n = {
.protocol = sk->sk_protocol,
.pid = nlk->pid,
@ -455,6 +470,9 @@ static int netlink_release(struct socket *sock)
netlink_table_ungrab();
}
kfree(nlk->groups);
nlk->groups = NULL;
sock_put(sk);
return 0;
}
@ -503,6 +521,18 @@ static inline int netlink_capable(struct socket *sock, unsigned int flag)
capable(CAP_NET_ADMIN);
}
static void
netlink_update_subscriptions(struct sock *sk, unsigned int subscriptions)
{
struct netlink_sock *nlk = nlk_sk(sk);
if (nlk->subscriptions && !subscriptions)
__sk_del_bind_node(sk);
else if (!nlk->subscriptions && subscriptions)
sk_add_bind_node(sk, &nl_table[sk->sk_protocol].mc_list);
nlk->subscriptions = subscriptions;
}
static int netlink_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
{
struct sock *sk = sock->sk;
@ -528,15 +558,14 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr, int addr_len
return err;
}
if (!nladdr->nl_groups && !nlk->groups)
if (!nladdr->nl_groups && !(u32)nlk->groups[0])
return 0;
netlink_table_grab();
if (nlk->groups && !nladdr->nl_groups)
__sk_del_bind_node(sk);
else if (!nlk->groups && nladdr->nl_groups)
sk_add_bind_node(sk, &nl_table[sk->sk_protocol].mc_list);
nlk->groups = nladdr->nl_groups;
netlink_update_subscriptions(sk, nlk->subscriptions +
hweight32(nladdr->nl_groups) -
hweight32(nlk->groups[0]));
nlk->groups[0] = (nlk->groups[0] & ~0xffffffffUL) | nladdr->nl_groups;
netlink_table_ungrab();
return 0;
@ -590,7 +619,7 @@ static int netlink_getname(struct socket *sock, struct sockaddr *addr, int *addr
nladdr->nl_groups = netlink_group_mask(nlk->dst_group);
} else {
nladdr->nl_pid = nlk->pid;
nladdr->nl_groups = nlk->groups;
nladdr->nl_groups = nlk->groups[0];
}
return 0;
}
@ -791,7 +820,8 @@ static inline int do_one_broadcast(struct sock *sk,
if (p->exclude_sk == sk)
goto out;
if (nlk->pid == p->pid || !(nlk->groups & netlink_group_mask(p->group)))
if (nlk->pid == p->pid || p->group - 1 >= nlk->ngroups ||
!test_bit(p->group - 1, nlk->groups))
goto out;
if (p->failure) {
@ -887,7 +917,8 @@ static inline int do_one_set_err(struct sock *sk,
if (sk == p->exclude_sk)
goto out;
if (nlk->pid == p->pid || !(nlk->groups & netlink_group_mask(p->group)))
if (nlk->pid == p->pid || p->group - 1 >= nlk->ngroups ||
!test_bit(p->group - 1, nlk->groups))
goto out;
sk->sk_err = p->code;
@ -1112,6 +1143,7 @@ netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len), struct
nlk->flags |= NETLINK_KERNEL_SOCKET;
netlink_table_grab();
nl_table[unit].groups = 32;
nl_table[unit].module = module;
nl_table[unit].registered = 1;
netlink_table_ungrab();
@ -1358,7 +1390,8 @@ static int netlink_seq_show(struct seq_file *seq, void *v)
s,
s->sk_protocol,
nlk->pid,
nlk->groups,
nlk->flags & NETLINK_KERNEL_SOCKET ?
0 : (unsigned int)nlk->groups[0],
atomic_read(&s->sk_rmem_alloc),
atomic_read(&s->sk_wmem_alloc),
nlk->cb,