[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/net/netlink/genetlink.c b/ap/os/linux/linux-3.4.x/net/netlink/genetlink.c
new file mode 100644
index 0000000..73d3f0c
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/netlink/genetlink.c
@@ -0,0 +1,1015 @@
+/*
+ * NETLINK Generic Netlink Family
+ *
+ * Authors: Jamal Hadi Salim
+ * Thomas Graf <tgraf@suug.ch>
+ * Johannes Berg <johannes@sipsolutions.net>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/mutex.h>
+#include <linux/bitmap.h>
+#include <net/sock.h>
+#include <net/genetlink.h>
+
+static DEFINE_MUTEX(genl_mutex); /* serialization of message processing */
+
+void genl_lock(void)
+{
+ mutex_lock(&genl_mutex);
+}
+EXPORT_SYMBOL(genl_lock);
+
+void genl_unlock(void)
+{
+ mutex_unlock(&genl_mutex);
+}
+EXPORT_SYMBOL(genl_unlock);
+
+#ifdef CONFIG_PROVE_LOCKING
+int lockdep_genl_is_held(void)
+{
+ return lockdep_is_held(&genl_mutex);
+}
+EXPORT_SYMBOL(lockdep_genl_is_held);
+#endif
+
+#define GENL_FAM_TAB_SIZE 16
+#define GENL_FAM_TAB_MASK (GENL_FAM_TAB_SIZE - 1)
+
+static struct list_head family_ht[GENL_FAM_TAB_SIZE];
+/*
+ * Bitmap of multicast groups that are currently in use.
+ *
+ * To avoid an allocation at boot of just one unsigned long,
+ * declare it global instead.
+ * Bit 0 is marked as already used since group 0 is invalid.
+ */
+static unsigned long mc_group_start = 0x1;
+static unsigned long *mc_groups = &mc_group_start;
+static unsigned long mc_groups_longs = 1;
+
+static int genl_ctrl_event(int event, void *data);
+
+static inline unsigned int genl_family_hash(unsigned int id)
+{
+ return id & GENL_FAM_TAB_MASK;
+}
+
+static inline struct list_head *genl_family_chain(unsigned int id)
+{
+ return &family_ht[genl_family_hash(id)];
+}
+
+static struct genl_family *genl_family_find_byid(unsigned int id)
+{
+ struct genl_family *f;
+
+ list_for_each_entry(f, genl_family_chain(id), family_list)
+ if (f->id == id)
+ return f;
+
+ return NULL;
+}
+
+static struct genl_family *genl_family_find_byname(char *name)
+{
+ struct genl_family *f;
+ int i;
+
+ for (i = 0; i < GENL_FAM_TAB_SIZE; i++)
+ list_for_each_entry(f, genl_family_chain(i), family_list)
+ if (strcmp(f->name, name) == 0)
+ return f;
+
+ return NULL;
+}
+
+static struct genl_ops *genl_get_cmd(u8 cmd, struct genl_family *family)
+{
+ struct genl_ops *ops;
+
+ list_for_each_entry(ops, &family->ops_list, ops_list)
+ if (ops->cmd == cmd)
+ return ops;
+
+ return NULL;
+}
+
+/* Of course we are going to have problems once we hit
+ * 2^16 alive types, but that can only happen by year 2K
+*/
+static u16 genl_generate_id(void)
+{
+ static u16 id_gen_idx = GENL_MIN_ID;
+ int i;
+
+ for (i = 0; i <= GENL_MAX_ID - GENL_MIN_ID; i++) {
+ if (!genl_family_find_byid(id_gen_idx))
+ return id_gen_idx;
+ if (++id_gen_idx > GENL_MAX_ID)
+ id_gen_idx = GENL_MIN_ID;
+ }
+
+ return 0;
+}
+
+static struct genl_multicast_group notify_grp;
+
+/**
+ * genl_register_mc_group - register a multicast group
+ *
+ * Registers the specified multicast group and notifies userspace
+ * about the new group.
+ *
+ * Returns 0 on success or a negative error code.
+ *
+ * @family: The generic netlink family the group shall be registered for.
+ * @grp: The group to register, must have a name.
+ */
+int genl_register_mc_group(struct genl_family *family,
+ struct genl_multicast_group *grp)
+{
+ int id;
+ unsigned long *new_groups;
+ int err = 0;
+
+ BUG_ON(grp->name[0] == '\0');
+ BUG_ON(memchr(grp->name, '\0', GENL_NAMSIZ) == NULL);
+
+ genl_lock();
+
+ /* special-case our own group */
+ if (grp == ¬ify_grp)
+ id = GENL_ID_CTRL;
+ else
+ id = find_first_zero_bit(mc_groups,
+ mc_groups_longs * BITS_PER_LONG);
+
+
+ if (id >= mc_groups_longs * BITS_PER_LONG) {
+ size_t nlen = (mc_groups_longs + 1) * sizeof(unsigned long);
+
+ if (mc_groups == &mc_group_start) {
+ new_groups = kzalloc(nlen, GFP_KERNEL);
+ if (!new_groups) {
+ err = -ENOMEM;
+ goto out;
+ }
+ mc_groups = new_groups;
+ *mc_groups = mc_group_start;
+ } else {
+ new_groups = krealloc(mc_groups, nlen, GFP_KERNEL);
+ if (!new_groups) {
+ err = -ENOMEM;
+ goto out;
+ }
+ mc_groups = new_groups;
+ mc_groups[mc_groups_longs] = 0;
+ }
+ mc_groups_longs++;
+ }
+
+ if (family->netnsok) {
+ struct net *net;
+
+ netlink_table_grab();
+ rcu_read_lock();
+ for_each_net_rcu(net) {
+ err = __netlink_change_ngroups(net->genl_sock,
+ mc_groups_longs * BITS_PER_LONG);
+ if (err) {
+ /*
+ * No need to roll back, can only fail if
+ * memory allocation fails and then the
+ * number of _possible_ groups has been
+ * increased on some sockets which is ok.
+ */
+ rcu_read_unlock();
+ netlink_table_ungrab();
+ goto out;
+ }
+ }
+ rcu_read_unlock();
+ netlink_table_ungrab();
+ } else {
+ err = netlink_change_ngroups(init_net.genl_sock,
+ mc_groups_longs * BITS_PER_LONG);
+ if (err)
+ goto out;
+ }
+
+ grp->id = id;
+ set_bit(id, mc_groups);
+ list_add_tail(&grp->list, &family->mcast_groups);
+ grp->family = family;
+
+ genl_ctrl_event(CTRL_CMD_NEWMCAST_GRP, grp);
+ out:
+ genl_unlock();
+ return err;
+}
+EXPORT_SYMBOL(genl_register_mc_group);
+
+static void __genl_unregister_mc_group(struct genl_family *family,
+ struct genl_multicast_group *grp)
+{
+ struct net *net;
+ BUG_ON(grp->family != family);
+
+ netlink_table_grab();
+ rcu_read_lock();
+ for_each_net_rcu(net)
+ __netlink_clear_multicast_users(net->genl_sock, grp->id);
+ rcu_read_unlock();
+ netlink_table_ungrab();
+
+ clear_bit(grp->id, mc_groups);
+ list_del(&grp->list);
+ genl_ctrl_event(CTRL_CMD_DELMCAST_GRP, grp);
+ grp->id = 0;
+ grp->family = NULL;
+}
+
+/**
+ * genl_unregister_mc_group - unregister a multicast group
+ *
+ * Unregisters the specified multicast group and notifies userspace
+ * about it. All current listeners on the group are removed.
+ *
+ * Note: It is not necessary to unregister all multicast groups before
+ * unregistering the family, unregistering the family will cause
+ * all assigned multicast groups to be unregistered automatically.
+ *
+ * @family: Generic netlink family the group belongs to.
+ * @grp: The group to unregister, must have been registered successfully
+ * previously.
+ */
+void genl_unregister_mc_group(struct genl_family *family,
+ struct genl_multicast_group *grp)
+{
+ genl_lock();
+ __genl_unregister_mc_group(family, grp);
+ genl_unlock();
+}
+EXPORT_SYMBOL(genl_unregister_mc_group);
+
+static void genl_unregister_mc_groups(struct genl_family *family)
+{
+ struct genl_multicast_group *grp, *tmp;
+
+ list_for_each_entry_safe(grp, tmp, &family->mcast_groups, list)
+ __genl_unregister_mc_group(family, grp);
+}
+
+/**
+ * genl_register_ops - register generic netlink operations
+ * @family: generic netlink family
+ * @ops: operations to be registered
+ *
+ * Registers the specified operations and assigns them to the specified
+ * family. Either a doit or dumpit callback must be specified or the
+ * operation will fail. Only one operation structure per command
+ * identifier may be registered.
+ *
+ * See include/net/genetlink.h for more documenation on the operations
+ * structure.
+ *
+ * Returns 0 on success or a negative error code.
+ */
+int genl_register_ops(struct genl_family *family, struct genl_ops *ops)
+{
+ int err = -EINVAL;
+
+ if (ops->dumpit == NULL && ops->doit == NULL)
+ goto errout;
+
+ if (genl_get_cmd(ops->cmd, family)) {
+ err = -EEXIST;
+ goto errout;
+ }
+
+ if (ops->dumpit)
+ ops->flags |= GENL_CMD_CAP_DUMP;
+ if (ops->doit)
+ ops->flags |= GENL_CMD_CAP_DO;
+ if (ops->policy)
+ ops->flags |= GENL_CMD_CAP_HASPOL;
+
+ genl_lock();
+ list_add_tail(&ops->ops_list, &family->ops_list);
+ genl_unlock();
+
+ genl_ctrl_event(CTRL_CMD_NEWOPS, ops);
+ err = 0;
+errout:
+ return err;
+}
+EXPORT_SYMBOL(genl_register_ops);
+
+/**
+ * genl_unregister_ops - unregister generic netlink operations
+ * @family: generic netlink family
+ * @ops: operations to be unregistered
+ *
+ * Unregisters the specified operations and unassigns them from the
+ * specified family. The operation blocks until the current message
+ * processing has finished and doesn't start again until the
+ * unregister process has finished.
+ *
+ * Note: It is not necessary to unregister all operations before
+ * unregistering the family, unregistering the family will cause
+ * all assigned operations to be unregistered automatically.
+ *
+ * Returns 0 on success or a negative error code.
+ */
+int genl_unregister_ops(struct genl_family *family, struct genl_ops *ops)
+{
+ struct genl_ops *rc;
+
+ genl_lock();
+ list_for_each_entry(rc, &family->ops_list, ops_list) {
+ if (rc == ops) {
+ list_del(&ops->ops_list);
+ genl_unlock();
+ genl_ctrl_event(CTRL_CMD_DELOPS, ops);
+ return 0;
+ }
+ }
+ genl_unlock();
+
+ return -ENOENT;
+}
+EXPORT_SYMBOL(genl_unregister_ops);
+
+/**
+ * genl_register_family - register a generic netlink family
+ * @family: generic netlink family
+ *
+ * Registers the specified family after validating it first. Only one
+ * family may be registered with the same family name or identifier.
+ * The family id may equal GENL_ID_GENERATE causing an unique id to
+ * be automatically generated and assigned.
+ *
+ * Return 0 on success or a negative error code.
+ */
+int genl_register_family(struct genl_family *family)
+{
+ int err = -EINVAL;
+
+ if (family->id && family->id < GENL_MIN_ID)
+ goto errout;
+
+ if (family->id > GENL_MAX_ID)
+ goto errout;
+
+ INIT_LIST_HEAD(&family->ops_list);
+ INIT_LIST_HEAD(&family->mcast_groups);
+
+ genl_lock();
+
+ if (genl_family_find_byname(family->name)) {
+ err = -EEXIST;
+ goto errout_locked;
+ }
+
+ if (family->id == GENL_ID_GENERATE) {
+ u16 newid = genl_generate_id();
+
+ if (!newid) {
+ err = -ENOMEM;
+ goto errout_locked;
+ }
+
+ family->id = newid;
+ } else if (genl_family_find_byid(family->id)) {
+ err = -EEXIST;
+ goto errout_locked;
+ }
+
+ if (family->maxattr) {
+ family->attrbuf = kmalloc((family->maxattr+1) *
+ sizeof(struct nlattr *), GFP_KERNEL);
+ if (family->attrbuf == NULL) {
+ err = -ENOMEM;
+ goto errout_locked;
+ }
+ } else
+ family->attrbuf = NULL;
+
+ list_add_tail(&family->family_list, genl_family_chain(family->id));
+ genl_unlock();
+
+ genl_ctrl_event(CTRL_CMD_NEWFAMILY, family);
+
+ return 0;
+
+errout_locked:
+ genl_unlock();
+errout:
+ return err;
+}
+EXPORT_SYMBOL(genl_register_family);
+
+/**
+ * genl_register_family_with_ops - register a generic netlink family
+ * @family: generic netlink family
+ * @ops: operations to be registered
+ * @n_ops: number of elements to register
+ *
+ * Registers the specified family and operations from the specified table.
+ * Only one family may be registered with the same family name or identifier.
+ *
+ * The family id may equal GENL_ID_GENERATE causing an unique id to
+ * be automatically generated and assigned.
+ *
+ * Either a doit or dumpit callback must be specified for every registered
+ * operation or the function will fail. Only one operation structure per
+ * command identifier may be registered.
+ *
+ * See include/net/genetlink.h for more documenation on the operations
+ * structure.
+ *
+ * This is equivalent to calling genl_register_family() followed by
+ * genl_register_ops() for every operation entry in the table taking
+ * care to unregister the family on error path.
+ *
+ * Return 0 on success or a negative error code.
+ */
+int genl_register_family_with_ops(struct genl_family *family,
+ struct genl_ops *ops, size_t n_ops)
+{
+ int err, i;
+
+ err = genl_register_family(family);
+ if (err)
+ return err;
+
+ for (i = 0; i < n_ops; ++i, ++ops) {
+ err = genl_register_ops(family, ops);
+ if (err)
+ goto err_out;
+ }
+ return 0;
+err_out:
+ genl_unregister_family(family);
+ return err;
+}
+EXPORT_SYMBOL(genl_register_family_with_ops);
+
+/**
+ * genl_unregister_family - unregister generic netlink family
+ * @family: generic netlink family
+ *
+ * Unregisters the specified family.
+ *
+ * Returns 0 on success or a negative error code.
+ */
+int genl_unregister_family(struct genl_family *family)
+{
+ struct genl_family *rc;
+
+ genl_lock();
+
+ 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;
+
+ list_del(&rc->family_list);
+ INIT_LIST_HEAD(&family->ops_list);
+ genl_unlock();
+
+ kfree(family->attrbuf);
+ genl_ctrl_event(CTRL_CMD_DELFAMILY, family);
+ return 0;
+ }
+
+ genl_unlock();
+
+ return -ENOENT;
+}
+EXPORT_SYMBOL(genl_unregister_family);
+
+/**
+ * genlmsg_put - Add generic netlink header to netlink message
+ * @skb: socket buffer holding the message
+ * @pid: netlink pid the message is addressed to
+ * @seq: sequence number (usually the one of the sender)
+ * @family: generic netlink family
+ * @flags netlink message flags
+ * @cmd: generic netlink command
+ *
+ * Returns pointer to user specific header
+ */
+void *genlmsg_put(struct sk_buff *skb, u32 pid, u32 seq,
+ struct genl_family *family, int flags, u8 cmd)
+{
+ struct nlmsghdr *nlh;
+ struct genlmsghdr *hdr;
+
+ nlh = nlmsg_put(skb, pid, seq, family->id, GENL_HDRLEN +
+ family->hdrsize, flags);
+ if (nlh == NULL)
+ return NULL;
+
+ hdr = nlmsg_data(nlh);
+ hdr->cmd = cmd;
+ hdr->version = family->version;
+ hdr->reserved = 0;
+
+ return (char *) hdr + GENL_HDRLEN;
+}
+EXPORT_SYMBOL(genlmsg_put);
+
+static int genl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ struct genl_ops *ops;
+ struct genl_family *family;
+ struct net *net = sock_net(skb->sk);
+ struct genl_info info;
+ struct genlmsghdr *hdr = nlmsg_data(nlh);
+ int hdrlen, err;
+
+ family = genl_family_find_byid(nlh->nlmsg_type);
+ if (family == NULL)
+ return -ENOENT;
+
+ /* this family doesn't exist in this netns */
+ if (!family->netnsok && !net_eq(net, &init_net))
+ return -ENOENT;
+
+ hdrlen = GENL_HDRLEN + family->hdrsize;
+ if (nlh->nlmsg_len < nlmsg_msg_size(hdrlen))
+ return -EINVAL;
+
+ ops = genl_get_cmd(hdr->cmd, family);
+ if (ops == NULL)
+ return -EOPNOTSUPP;
+
+ if ((ops->flags & GENL_ADMIN_PERM) &&
+ !capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (nlh->nlmsg_flags & NLM_F_DUMP) {
+ if (ops->dumpit == NULL)
+ return -EOPNOTSUPP;
+
+ genl_unlock();
+ {
+ struct netlink_dump_control c = {
+ .dump = ops->dumpit,
+ .done = ops->done,
+ };
+ err = netlink_dump_start(net->genl_sock, skb, nlh, &c);
+ }
+ genl_lock();
+ return err;
+ }
+
+ if (ops->doit == NULL)
+ return -EOPNOTSUPP;
+
+ if (family->attrbuf) {
+ err = nlmsg_parse(nlh, hdrlen, family->attrbuf, family->maxattr,
+ ops->policy);
+ if (err < 0)
+ return err;
+ }
+
+ info.snd_seq = nlh->nlmsg_seq;
+ info.snd_pid = NETLINK_CB(skb).pid;
+ info.nlhdr = nlh;
+ info.genlhdr = nlmsg_data(nlh);
+ info.userhdr = nlmsg_data(nlh) + GENL_HDRLEN;
+ info.attrs = family->attrbuf;
+ genl_info_net_set(&info, net);
+ memset(&info.user_ptr, 0, sizeof(info.user_ptr));
+
+ if (family->pre_doit) {
+ err = family->pre_doit(ops, skb, &info);
+ if (err)
+ return err;
+ }
+
+ err = ops->doit(skb, &info);
+
+ if (family->post_doit)
+ family->post_doit(ops, skb, &info);
+
+ return err;
+}
+
+static void genl_rcv(struct sk_buff *skb)
+{
+ genl_lock();
+ netlink_rcv_skb(skb, &genl_rcv_msg);
+ genl_unlock();
+}
+
+/**************************************************************************
+ * Controller
+ **************************************************************************/
+
+static struct genl_family genl_ctrl = {
+ .id = GENL_ID_CTRL,
+ .name = "nlctrl",
+ .version = 0x2,
+ .maxattr = CTRL_ATTR_MAX,
+ .netnsok = true,
+};
+
+static int ctrl_fill_info(struct genl_family *family, u32 pid, u32 seq,
+ u32 flags, struct sk_buff *skb, u8 cmd)
+{
+ void *hdr;
+
+ hdr = genlmsg_put(skb, pid, seq, &genl_ctrl, flags, cmd);
+ if (hdr == NULL)
+ return -1;
+
+ NLA_PUT_STRING(skb, CTRL_ATTR_FAMILY_NAME, family->name);
+ NLA_PUT_U16(skb, CTRL_ATTR_FAMILY_ID, family->id);
+ NLA_PUT_U32(skb, CTRL_ATTR_VERSION, family->version);
+ NLA_PUT_U32(skb, CTRL_ATTR_HDRSIZE, family->hdrsize);
+ NLA_PUT_U32(skb, CTRL_ATTR_MAXATTR, family->maxattr);
+
+ if (!list_empty(&family->ops_list)) {
+ struct nlattr *nla_ops;
+ struct genl_ops *ops;
+ int idx = 1;
+
+ nla_ops = nla_nest_start(skb, CTRL_ATTR_OPS);
+ if (nla_ops == NULL)
+ goto nla_put_failure;
+
+ list_for_each_entry(ops, &family->ops_list, ops_list) {
+ struct nlattr *nest;
+
+ nest = nla_nest_start(skb, idx++);
+ if (nest == NULL)
+ goto nla_put_failure;
+
+ NLA_PUT_U32(skb, CTRL_ATTR_OP_ID, ops->cmd);
+ NLA_PUT_U32(skb, CTRL_ATTR_OP_FLAGS, ops->flags);
+
+ nla_nest_end(skb, nest);
+ }
+
+ nla_nest_end(skb, nla_ops);
+ }
+
+ if (!list_empty(&family->mcast_groups)) {
+ struct genl_multicast_group *grp;
+ struct nlattr *nla_grps;
+ int idx = 1;
+
+ nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS);
+ if (nla_grps == NULL)
+ goto nla_put_failure;
+
+ list_for_each_entry(grp, &family->mcast_groups, list) {
+ struct nlattr *nest;
+
+ nest = nla_nest_start(skb, idx++);
+ if (nest == NULL)
+ goto nla_put_failure;
+
+ NLA_PUT_U32(skb, CTRL_ATTR_MCAST_GRP_ID, grp->id);
+ NLA_PUT_STRING(skb, CTRL_ATTR_MCAST_GRP_NAME,
+ grp->name);
+
+ nla_nest_end(skb, nest);
+ }
+ nla_nest_end(skb, nla_grps);
+ }
+
+ return genlmsg_end(skb, hdr);
+
+nla_put_failure:
+ genlmsg_cancel(skb, hdr);
+ return -EMSGSIZE;
+}
+
+static int ctrl_fill_mcgrp_info(struct genl_multicast_group *grp, u32 pid,
+ u32 seq, u32 flags, struct sk_buff *skb,
+ u8 cmd)
+{
+ void *hdr;
+ struct nlattr *nla_grps;
+ struct nlattr *nest;
+
+ hdr = genlmsg_put(skb, pid, seq, &genl_ctrl, flags, cmd);
+ if (hdr == NULL)
+ return -1;
+
+ NLA_PUT_STRING(skb, CTRL_ATTR_FAMILY_NAME, grp->family->name);
+ NLA_PUT_U16(skb, CTRL_ATTR_FAMILY_ID, grp->family->id);
+
+ nla_grps = nla_nest_start(skb, CTRL_ATTR_MCAST_GROUPS);
+ if (nla_grps == NULL)
+ goto nla_put_failure;
+
+ nest = nla_nest_start(skb, 1);
+ if (nest == NULL)
+ goto nla_put_failure;
+
+ NLA_PUT_U32(skb, CTRL_ATTR_MCAST_GRP_ID, grp->id);
+ NLA_PUT_STRING(skb, CTRL_ATTR_MCAST_GRP_NAME,
+ grp->name);
+
+ nla_nest_end(skb, nest);
+ nla_nest_end(skb, nla_grps);
+
+ return genlmsg_end(skb, hdr);
+
+nla_put_failure:
+ genlmsg_cancel(skb, hdr);
+ return -EMSGSIZE;
+}
+
+static int ctrl_dumpfamily(struct sk_buff *skb, struct netlink_callback *cb)
+{
+
+ int i, n = 0;
+ struct genl_family *rt;
+ struct net *net = sock_net(skb->sk);
+ int chains_to_skip = cb->args[0];
+ int fams_to_skip = cb->args[1];
+
+ for (i = chains_to_skip; i < GENL_FAM_TAB_SIZE; i++) {
+ n = 0;
+ list_for_each_entry(rt, genl_family_chain(i), family_list) {
+ if (!rt->netnsok && !net_eq(net, &init_net))
+ continue;
+ if (++n < fams_to_skip)
+ continue;
+ if (ctrl_fill_info(rt, NETLINK_CB(cb->skb).pid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ skb, CTRL_CMD_NEWFAMILY) < 0)
+ goto errout;
+ }
+
+ fams_to_skip = 0;
+ }
+
+errout:
+ cb->args[0] = i;
+ cb->args[1] = n;
+
+ return skb->len;
+}
+
+static struct sk_buff *ctrl_build_family_msg(struct genl_family *family,
+ u32 pid, int seq, u8 cmd)
+{
+ struct sk_buff *skb;
+ int err;
+
+ skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (skb == NULL)
+ return ERR_PTR(-ENOBUFS);
+
+ err = ctrl_fill_info(family, pid, seq, 0, skb, cmd);
+ if (err < 0) {
+ nlmsg_free(skb);
+ return ERR_PTR(err);
+ }
+
+ return skb;
+}
+
+static struct sk_buff *ctrl_build_mcgrp_msg(struct genl_multicast_group *grp,
+ u32 pid, int seq, u8 cmd)
+{
+ struct sk_buff *skb;
+ int err;
+
+ skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (skb == NULL)
+ return ERR_PTR(-ENOBUFS);
+
+ err = ctrl_fill_mcgrp_info(grp, pid, seq, 0, skb, cmd);
+ if (err < 0) {
+ nlmsg_free(skb);
+ return ERR_PTR(err);
+ }
+
+ return skb;
+}
+
+static const struct nla_policy ctrl_policy[CTRL_ATTR_MAX+1] = {
+ [CTRL_ATTR_FAMILY_ID] = { .type = NLA_U16 },
+ [CTRL_ATTR_FAMILY_NAME] = { .type = NLA_NUL_STRING,
+ .len = GENL_NAMSIZ - 1 },
+};
+
+static int ctrl_getfamily(struct sk_buff *skb, struct genl_info *info)
+{
+ struct sk_buff *msg;
+ struct genl_family *res = NULL;
+ int err = -EINVAL;
+
+ if (info->attrs[CTRL_ATTR_FAMILY_ID]) {
+ u16 id = nla_get_u16(info->attrs[CTRL_ATTR_FAMILY_ID]);
+ res = genl_family_find_byid(id);
+ err = -ENOENT;
+ }
+
+ if (info->attrs[CTRL_ATTR_FAMILY_NAME]) {
+ char *name;
+
+ name = nla_data(info->attrs[CTRL_ATTR_FAMILY_NAME]);
+ res = genl_family_find_byname(name);
+#ifdef CONFIG_MODULES
+ if (res == NULL) {
+ genl_unlock();
+ request_module("net-pf-%d-proto-%d-type-%s",
+ PF_NETLINK, NETLINK_GENERIC, name);
+ genl_lock();
+ res = genl_family_find_byname(name);
+ }
+#endif
+ err = -ENOENT;
+ }
+
+ if (res == NULL)
+ return err;
+
+ if (!res->netnsok && !net_eq(genl_info_net(info), &init_net)) {
+ /* family doesn't exist here */
+ return -ENOENT;
+ }
+
+ msg = ctrl_build_family_msg(res, info->snd_pid, info->snd_seq,
+ CTRL_CMD_NEWFAMILY);
+ if (IS_ERR(msg))
+ return PTR_ERR(msg);
+
+ return genlmsg_reply(msg, info);
+}
+
+static int genl_ctrl_event(int event, void *data)
+{
+ struct sk_buff *msg;
+ struct genl_family *family;
+ struct genl_multicast_group *grp;
+
+ /* genl is still initialising */
+ if (!init_net.genl_sock)
+ return 0;
+
+ switch (event) {
+ case CTRL_CMD_NEWFAMILY:
+ case CTRL_CMD_DELFAMILY:
+ family = data;
+ msg = ctrl_build_family_msg(family, 0, 0, event);
+ break;
+ case CTRL_CMD_NEWMCAST_GRP:
+ case CTRL_CMD_DELMCAST_GRP:
+ grp = data;
+ family = grp->family;
+ msg = ctrl_build_mcgrp_msg(data, 0, 0, event);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (IS_ERR(msg))
+ return PTR_ERR(msg);
+
+ if (!family->netnsok) {
+ genlmsg_multicast_netns(&init_net, msg, 0,
+ GENL_ID_CTRL, GFP_KERNEL);
+ } else {
+ rcu_read_lock();
+ genlmsg_multicast_allns(msg, 0, GENL_ID_CTRL, GFP_ATOMIC);
+ rcu_read_unlock();
+ }
+
+ return 0;
+}
+
+static struct genl_ops genl_ctrl_ops = {
+ .cmd = CTRL_CMD_GETFAMILY,
+ .doit = ctrl_getfamily,
+ .dumpit = ctrl_dumpfamily,
+ .policy = ctrl_policy,
+};
+
+static struct genl_multicast_group notify_grp = {
+ .name = "notify",
+};
+
+static int __net_init genl_pernet_init(struct net *net)
+{
+ /* we'll bump the group number right afterwards */
+ net->genl_sock = netlink_kernel_create(net, NETLINK_GENERIC, 0,
+ genl_rcv, &genl_mutex,
+ THIS_MODULE);
+
+ if (!net->genl_sock && net_eq(net, &init_net))
+ panic("GENL: Cannot initialize generic netlink\n");
+
+ if (!net->genl_sock)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void __net_exit genl_pernet_exit(struct net *net)
+{
+ netlink_kernel_release(net->genl_sock);
+ net->genl_sock = NULL;
+}
+
+static struct pernet_operations genl_pernet_ops = {
+ .init = genl_pernet_init,
+ .exit = genl_pernet_exit,
+};
+
+static int __init genl_init(void)
+{
+ int i, err;
+
+ for (i = 0; i < GENL_FAM_TAB_SIZE; i++)
+ INIT_LIST_HEAD(&family_ht[i]);
+
+ err = genl_register_family_with_ops(&genl_ctrl, &genl_ctrl_ops, 1);
+ if (err < 0)
+ goto problem;
+
+ netlink_set_nonroot(NETLINK_GENERIC, NL_NONROOT_RECV);
+
+ err = register_pernet_subsys(&genl_pernet_ops);
+ if (err)
+ goto problem;
+
+ err = genl_register_mc_group(&genl_ctrl, ¬ify_grp);
+ if (err < 0)
+ goto problem;
+
+ return 0;
+
+problem:
+ panic("GENL: Cannot register controller: %d\n", err);
+}
+
+subsys_initcall(genl_init);
+
+static int genlmsg_mcast(struct sk_buff *skb, u32 pid, unsigned long group,
+ gfp_t flags)
+{
+ struct sk_buff *tmp;
+ struct net *net, *prev = NULL;
+ int err;
+
+ for_each_net_rcu(net) {
+ if (prev) {
+ tmp = skb_clone(skb, flags);
+ if (!tmp) {
+ err = -ENOMEM;
+ goto error;
+ }
+ err = nlmsg_multicast(prev->genl_sock, tmp,
+ pid, group, flags);
+ if (err)
+ goto error;
+ }
+
+ prev = net;
+ }
+
+ return nlmsg_multicast(prev->genl_sock, skb, pid, group, flags);
+ error:
+ kfree_skb(skb);
+ return err;
+}
+
+int genlmsg_multicast_allns(struct sk_buff *skb, u32 pid, unsigned int group,
+ gfp_t flags)
+{
+ return genlmsg_mcast(skb, pid, group, flags);
+}
+EXPORT_SYMBOL(genlmsg_multicast_allns);
+
+void genl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
+ struct nlmsghdr *nlh, gfp_t flags)
+{
+ struct sock *sk = net->genl_sock;
+ int report = 0;
+
+ if (nlh)
+ report = nlmsg_report(nlh);
+
+ nlmsg_notify(sk, skb, pid, group, report, flags);
+}
+EXPORT_SYMBOL(genl_notify);