diff options
| -rw-r--r-- | include/net/genetlink.h | 9 | ||||
| -rw-r--r-- | net/netlink/af_netlink.c | 25 | ||||
| -rw-r--r-- | net/netlink/genetlink.c | 59 | ||||
| -rw-r--r-- | net/openvswitch/datapath.c | 3 |
4 files changed, 83 insertions, 13 deletions
diff --git a/include/net/genetlink.h b/include/net/genetlink.h index af10c2cf8a1d..3ed31e5a445b 100644 --- a/include/net/genetlink.h +++ b/include/net/genetlink.h @@ -31,6 +31,9 @@ struct genl_info; * do additional, common, filtering and return an error * @post_doit: called after an operation's doit callback, it may * undo operations done by pre_doit, for example release locks + * @mcast_bind: a socket bound to the given multicast group (which + * is given as the offset into the groups array) + * @mcast_unbind: a socket was unbound from the given multicast group * @attrbuf: buffer to store parsed attributes * @family_list: family list * @mcgrps: multicast groups used by this family (private) @@ -53,6 +56,8 @@ struct genl_family { void (*post_doit)(const struct genl_ops *ops, struct sk_buff *skb, struct genl_info *info); + int (*mcast_bind)(int group); + void (*mcast_unbind)(int group); struct nlattr ** attrbuf; /* private */ const struct genl_ops * ops; /* private */ const struct genl_multicast_group *mcgrps; /* private */ @@ -395,11 +400,11 @@ static inline int genl_set_err(struct genl_family *family, struct net *net, } static inline int genl_has_listeners(struct genl_family *family, - struct sock *sk, unsigned int group) + struct net *net, unsigned int group) { if (WARN_ON_ONCE(group >= family->n_mcgrps)) return -EINVAL; group = family->mcgrp_offset + group; - return netlink_has_listeners(sk, group); + return netlink_has_listeners(net->genl_sock, group); } #endif /* __NET_GENERIC_NETLINK_H */ diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index 074cf3e91c6f..f29b63fad932 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -1091,8 +1091,10 @@ static void netlink_remove(struct sock *sk) mutex_unlock(&nl_sk_hash_lock); netlink_table_grab(); - if (nlk_sk(sk)->subscriptions) + if (nlk_sk(sk)->subscriptions) { __sk_del_bind_node(sk); + netlink_update_listeners(sk); + } netlink_table_ungrab(); } @@ -1226,8 +1228,8 @@ static int netlink_release(struct socket *sock) module_put(nlk->module); - netlink_table_grab(); if (netlink_is_kernel(sk)) { + netlink_table_grab(); BUG_ON(nl_table[sk->sk_protocol].registered == 0); if (--nl_table[sk->sk_protocol].registered == 0) { struct listeners *old; @@ -1241,11 +1243,16 @@ static int netlink_release(struct socket *sock) nl_table[sk->sk_protocol].flags = 0; nl_table[sk->sk_protocol].registered = 0; } - } else if (nlk->subscriptions) { - netlink_update_listeners(sk); + netlink_table_ungrab(); } - netlink_table_ungrab(); + if (nlk->netlink_unbind) { + int i; + + for (i = 0; i < nlk->ngroups; i++) + if (test_bit(i, nlk->groups)) + nlk->netlink_unbind(i + 1); + } kfree(nlk->groups); nlk->groups = NULL; @@ -1410,8 +1417,8 @@ static int netlink_realloc_groups(struct sock *sk) return err; } -static void netlink_unbind(int group, long unsigned int groups, - struct netlink_sock *nlk) +static void netlink_undo_bind(int group, long unsigned int groups, + struct netlink_sock *nlk) { int undo; @@ -1461,7 +1468,7 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr, err = nlk->netlink_bind(group); if (!err) continue; - netlink_unbind(group, groups, nlk); + netlink_undo_bind(group, groups, nlk); return err; } } @@ -1471,7 +1478,7 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr, netlink_insert(sk, net, nladdr->nl_pid) : netlink_autobind(sock); if (err) { - netlink_unbind(nlk->ngroups, groups, nlk); + netlink_undo_bind(nlk->ngroups, groups, nlk); return err; } } diff --git a/net/netlink/genetlink.c b/net/netlink/genetlink.c index 76393f2f4b22..05bf40bbd189 100644 --- a/net/netlink/genetlink.c +++ b/net/netlink/genetlink.c @@ -983,11 +983,70 @@ static struct genl_multicast_group genl_ctrl_groups[] = { { .name = "notify", }, }; +static int genl_bind(int group) +{ + int i, err; + bool found = false; + + 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_bind) + err = f->mcast_bind(fam_grp); + else + err = 0; + found = true; + break; + } + } + } + up_read(&cb_lock); + + if (WARN_ON(!found)) + err = 0; + + return err; +} + +static void genl_unbind(int group) +{ + int i; + bool found = false; + + 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(fam_grp); + found = true; + break; + } + } + } + up_read(&cb_lock); + + WARN_ON(!found); +} + 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 */ diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c index 332b5a031739..4e9a5f035cbc 100644 --- a/net/openvswitch/datapath.c +++ b/net/openvswitch/datapath.c @@ -83,8 +83,7 @@ static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, unsigned int group) { return info->nlhdr->nlmsg_flags & NLM_F_ECHO || - genl_has_listeners(family, genl_info_net(info)->genl_sock, - group); + genl_has_listeners(family, genl_info_net(info), group); } static void ovs_notify(struct genl_family *family, |