diff options
Diffstat (limited to 'net/netlink/genetlink.c')
| -rw-r--r-- | net/netlink/genetlink.c | 64 |
1 files changed, 61 insertions, 3 deletions
diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c index 76393f2f4b22..ee57459fc258 100644 --- a/net/netlink/genetlink.c +++ b/net/netlink/genetlink.c @@ -23,6 +23,9 @@ static DEFINE_MUTEX(genl_mutex); /* serialization of message processing */ static DECLARE_RWSEM(cb_lock); +atomic_t genl_sk_destructing_cnt = ATOMIC_INIT(0); +DECLARE_WAIT_QUEUE_HEAD(genl_sk_destructing_waitq); + void genl_lock(void) { mutex_lock(&genl_mutex); @@ -435,15 +438,18 @@ int genl_unregister_family(struct genl_family *family) genl_lock_all(); - genl_unregister_mc_groups(family); - list_for_each_entry(rc, genl_family_chain(family->id), family_list) { if (family->id != rc->id || strcmp(rc->name, family->name)) continue; + genl_unregister_mc_groups(family); + list_del(&rc->family_list); family->n_ops = 0; - genl_unlock_all(); + up_write(&cb_lock); + wait_event(genl_sk_destructing_waitq, + atomic_read(&genl_sk_destructing_cnt) == 0); + genl_unlock(); kfree(family->attrbuf); genl_ctrl_event(CTRL_CMD_DELFAMILY, family, NULL, 0); @@ -983,11 +989,63 @@ static struct genl_multicast_group genl_ctrl_groups[] = { { .name = "notify", }, }; +static int genl_bind(struct net *net, int group) +{ + int i, err = -ENOENT; + + down_read(&cb_lock); + for (i = 0; i < GENL_FAM_TAB_SIZE; i++) { + struct genl_family *f; + + list_for_each_entry(f, genl_family_chain(i), family_list) { + if (group >= f->mcgrp_offset && + group < f->mcgrp_offset + f->n_mcgrps) { + int fam_grp = group - f->mcgrp_offset; + + if (!f->netnsok && net != &init_net) + err = -ENOENT; + else if (f->mcast_bind) + err = f->mcast_bind(net, fam_grp); + else + err = 0; + break; + } + } + } + up_read(&cb_lock); + + return err; +} + +static void genl_unbind(struct net *net, int group) +{ + int i; + + down_read(&cb_lock); + for (i = 0; i < GENL_FAM_TAB_SIZE; i++) { + struct genl_family *f; + + list_for_each_entry(f, genl_family_chain(i), family_list) { + if (group >= f->mcgrp_offset && + group < f->mcgrp_offset + f->n_mcgrps) { + int fam_grp = group - f->mcgrp_offset; + + if (f->mcast_unbind) + f->mcast_unbind(net, fam_grp); + break; + } + } + } + up_read(&cb_lock); +} + static int __net_init genl_pernet_init(struct net *net) { struct netlink_kernel_cfg cfg = { .input = genl_rcv, .flags = NL_CFG_F_NONROOT_RECV, + .bind = genl_bind, + .unbind = genl_unbind, }; /* we'll bump the group number right afterwards */ |