--- /dev/null
+/*
+ * NETLINK Kernel-user communication protocol.
+ *
+ * Authors: Alan Cox <alan@lxorguk.ukuu.org.uk>
+ * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
+ * Patrick McHardy <kaber@trash.net>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Tue Jun 26 14:36:48 MEST 2001 Herbert "herp" Rosmanith
+ * added netlink_proto_exit
+ * Tue Jan 22 18:32:44 BRST 2002 Arnaldo C. de Melo <acme@conectiva.com.br>
+ * use nlk_sk, as sk->protinfo is on a diet 8)
+ * Fri Jul 22 19:51:12 MEST 2005 Harald Welte <laforge@gnumonks.org>
+ * - inc module use count of module that owns
+ * the kernel socket in case userspace opens
+ * socket of same protocol
+ * - remove all module support, since netlink is
+ * mandatory if CONFIG_NET=y these days
+ */
+
+#include <linux/module.h>
+
+#include <linux/capability.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/socket.h>
+#include <linux/un.h>
+#include <linux/fcntl.h>
+#include <linux/termios.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/fs.h>
+#include <linux/slab.h>
+#include <asm/uaccess.h>
+#include <linux/skbuff.h>
+#include <linux/netdevice.h>
+#include <linux/rtnetlink.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/notifier.h>
+#include <linux/security.h>
+#include <linux/jhash.h>
+#include <linux/jiffies.h>
+#include <linux/random.h>
+#include <linux/bitops.h>
+#include <linux/mm.h>
+#include <linux/types.h>
+#include <linux/audit.h>
+#include <linux/mutex.h>
+#include <linux/vmalloc.h>
+#include <linux/if_arp.h>
+#include <linux/rhashtable.h>
+#include <asm/cacheflush.h>
+#include <linux/hash.h>
+#include <linux/genetlink.h>
+
+#include <net/net_namespace.h>
+#include <net/sock.h>
+#include <net/scm.h>
+#include <net/netlink.h>
+
+#include "af_netlink.h"
+
+struct listeners {
+ struct rcu_head rcu;
+ unsigned long masks[0];
+};
+
+/* state bits */
+#define NETLINK_CONGESTED 0x0
+
+/* flags */
+#define NETLINK_KERNEL_SOCKET 0x1
+#define NETLINK_RECV_PKTINFO 0x2
+#define NETLINK_BROADCAST_SEND_ERROR 0x4
+#define NETLINK_RECV_NO_ENOBUFS 0x8
+
+static inline int netlink_is_kernel(struct sock *sk)
+{
+ return nlk_sk(sk)->flags & NETLINK_KERNEL_SOCKET;
+}
+
+struct netlink_table *nl_table __read_mostly;
+EXPORT_SYMBOL_GPL(nl_table);
+
+static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait);
+
+static int netlink_dump(struct sock *sk);
+static void netlink_skb_destructor(struct sk_buff *skb);
+
+/* nl_table locking explained:
+ * Lookup and traversal are protected with an RCU read-side lock. Insertion
+ * and removal are protected with per bucket lock while using RCU list
+ * modification primitives and may run in parallel to RCU protected lookups.
+ * Destruction of the Netlink socket may only occur *after* nl_table_lock has
+ * been acquired * either during or after the socket has been removed from
+ * the list and after an RCU grace period.
+ */
+DEFINE_RWLOCK(nl_table_lock);
+EXPORT_SYMBOL_GPL(nl_table_lock);
+static atomic_t nl_table_users = ATOMIC_INIT(0);
+
+#define nl_deref_protected(X) rcu_dereference_protected(X, lockdep_is_held(&nl_table_lock));
+
+static ATOMIC_NOTIFIER_HEAD(netlink_chain);
+
+static DEFINE_SPINLOCK(netlink_tap_lock);
+static struct list_head netlink_tap_all __read_mostly;
+
+static const struct rhashtable_params netlink_rhashtable_params;
+
+static inline u32 netlink_group_mask(u32 group)
+{
+ return group ? 1 << (group - 1) : 0;
+}
+
+int netlink_add_tap(struct netlink_tap *nt)
+{
+ if (unlikely(nt->dev->type != ARPHRD_NETLINK))
+ return -EINVAL;
+
+ spin_lock(&netlink_tap_lock);
+ list_add_rcu(&nt->list, &netlink_tap_all);
+ spin_unlock(&netlink_tap_lock);
+
+ __module_get(nt->module);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(netlink_add_tap);
+
+static int __netlink_remove_tap(struct netlink_tap *nt)
+{
+ bool found = false;
+ struct netlink_tap *tmp;
+
+ spin_lock(&netlink_tap_lock);
+
+ list_for_each_entry(tmp, &netlink_tap_all, list) {
+ if (nt == tmp) {
+ list_del_rcu(&nt->list);
+ found = true;
+ goto out;
+ }
+ }
+
+ pr_warn("__netlink_remove_tap: %p not found\n", nt);
+out:
+ spin_unlock(&netlink_tap_lock);
+
+ if (found && nt->module)
+ module_put(nt->module);
+
+ return found ? 0 : -ENODEV;
+}
+
+int netlink_remove_tap(struct netlink_tap *nt)
+{
+ int ret;
+
+ ret = __netlink_remove_tap(nt);
+ synchronize_net();
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(netlink_remove_tap);
+
+static bool netlink_filter_tap(const struct sk_buff *skb)
+{
+ struct sock *sk = skb->sk;
+
+ /* We take the more conservative approach and
+ * whitelist socket protocols that may pass.
+ */
+ switch (sk->sk_protocol) {
+ case NETLINK_ROUTE:
+ case NETLINK_USERSOCK:
+ case NETLINK_SOCK_DIAG:
+ case NETLINK_NFLOG:
+ case NETLINK_XFRM:
+ case NETLINK_FIB_LOOKUP:
+ case NETLINK_NETFILTER:
+ case NETLINK_GENERIC:
+ return true;
+ }
+
+ return false;
+}
+
+static int __netlink_deliver_tap_skb(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ struct sk_buff *nskb;
+ struct sock *sk = skb->sk;
+ int ret = -ENOMEM;
+
+ dev_hold(dev);
+ nskb = skb_clone(skb, GFP_ATOMIC);
+ if (nskb) {
+ nskb->dev = dev;
+ nskb->protocol = htons((u16) sk->sk_protocol);
+ nskb->pkt_type = netlink_is_kernel(sk) ?
+ PACKET_KERNEL : PACKET_USER;
+ skb_reset_network_header(nskb);
+ ret = dev_queue_xmit(nskb);
+ if (unlikely(ret > 0))
+ ret = net_xmit_errno(ret);
+ }
+
+ dev_put(dev);
+ return ret;
+}
+
+static void __netlink_deliver_tap(struct sk_buff *skb)
+{
+ int ret;
+ struct netlink_tap *tmp;
+
+ if (!netlink_filter_tap(skb))
+ return;
+
+ list_for_each_entry_rcu(tmp, &netlink_tap_all, list) {
+ ret = __netlink_deliver_tap_skb(skb, tmp->dev);
+ if (unlikely(ret))
+ break;
+ }
+}
+
+static void netlink_deliver_tap(struct sk_buff *skb)
+{
+ rcu_read_lock();
+
+ if (unlikely(!list_empty(&netlink_tap_all)))
+ __netlink_deliver_tap(skb);
+
+ rcu_read_unlock();
+}
+
+static void netlink_deliver_tap_kernel(struct sock *dst, struct sock *src,
+ struct sk_buff *skb)
+{
+ if (!(netlink_is_kernel(dst) && netlink_is_kernel(src)))
+ netlink_deliver_tap(skb);
+}
+
+static void netlink_overrun(struct sock *sk)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+
+ if (!(nlk->flags & NETLINK_RECV_NO_ENOBUFS)) {
+ if (!test_and_set_bit(NETLINK_CONGESTED, &nlk_sk(sk)->state)) {
+ sk->sk_err = ENOBUFS;
+ sk->sk_error_report(sk);
+ }
+ }
+ atomic_inc(&sk->sk_drops);
+}
+
+static void netlink_rcv_wake(struct sock *sk)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+
+ if (skb_queue_empty(&sk->sk_receive_queue))
+ clear_bit(NETLINK_CONGESTED, &nlk->state);
+ if (!test_bit(NETLINK_CONGESTED, &nlk->state))
+ wake_up_interruptible(&nlk->wait);
+}
+
+#ifdef CONFIG_NETLINK_MMAP
+static bool netlink_skb_is_mmaped(const struct sk_buff *skb)
+{
+ return NETLINK_CB(skb).flags & NETLINK_SKB_MMAPED;
+}
+
+static bool netlink_rx_is_mmaped(struct sock *sk)
+{
+ return nlk_sk(sk)->rx_ring.pg_vec != NULL;
+}
+
+static bool netlink_tx_is_mmaped(struct sock *sk)
+{
+ return nlk_sk(sk)->tx_ring.pg_vec != NULL;
+}
+
+static __pure struct page *pgvec_to_page(const void *addr)
+{
+ if (is_vmalloc_addr(addr))
+ return vmalloc_to_page(addr);
+ else
+ return virt_to_page(addr);
+}
+
+static void free_pg_vec(void **pg_vec, unsigned int order, unsigned int len)
+{
+ unsigned int i;
+
+ for (i = 0; i < len; i++) {
+ if (pg_vec[i] != NULL) {
+ if (is_vmalloc_addr(pg_vec[i]))
+ vfree(pg_vec[i]);
+ else
+ free_pages((unsigned long)pg_vec[i], order);
+ }
+ }
+ kfree(pg_vec);
+}
+
+static void *alloc_one_pg_vec_page(unsigned long order)
+{
+ void *buffer;
+ gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO |
+ __GFP_NOWARN | __GFP_NORETRY;
+
+ buffer = (void *)__get_free_pages(gfp_flags, order);
+ if (buffer != NULL)
+ return buffer;
+
+ buffer = vzalloc((1 << order) * PAGE_SIZE);
+ if (buffer != NULL)
+ return buffer;
+
+ gfp_flags &= ~__GFP_NORETRY;
+ return (void *)__get_free_pages(gfp_flags, order);
+}
+
+static void **alloc_pg_vec(struct netlink_sock *nlk,
+ struct nl_mmap_req *req, unsigned int order)
+{
+ unsigned int block_nr = req->nm_block_nr;
+ unsigned int i;
+ void **pg_vec;
+
+ pg_vec = kcalloc(block_nr, sizeof(void *), GFP_KERNEL);
+ if (pg_vec == NULL)
+ return NULL;
+
+ for (i = 0; i < block_nr; i++) {
+ pg_vec[i] = alloc_one_pg_vec_page(order);
+ if (pg_vec[i] == NULL)
+ goto err1;
+ }
+
+ return pg_vec;
+err1:
+ free_pg_vec(pg_vec, order, block_nr);
+ return NULL;
+}
+
+static int netlink_set_ring(struct sock *sk, struct nl_mmap_req *req,
+ bool closing, bool tx_ring)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+ struct netlink_ring *ring;
+ struct sk_buff_head *queue;
+ void **pg_vec = NULL;
+ unsigned int order = 0;
+ int err;
+
+ ring = tx_ring ? &nlk->tx_ring : &nlk->rx_ring;
+ queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
+
+ if (!closing) {
+ if (atomic_read(&nlk->mapped))
+ return -EBUSY;
+ if (atomic_read(&ring->pending))
+ return -EBUSY;
+ }
+
+ if (req->nm_block_nr) {
+ if (ring->pg_vec != NULL)
+ return -EBUSY;
+
+ if ((int)req->nm_block_size <= 0)
+ return -EINVAL;
+ if (!PAGE_ALIGNED(req->nm_block_size))
+ return -EINVAL;
+ if (req->nm_frame_size < NL_MMAP_HDRLEN)
+ return -EINVAL;
+ if (!IS_ALIGNED(req->nm_frame_size, NL_MMAP_MSG_ALIGNMENT))
+ return -EINVAL;
+
+ ring->frames_per_block = req->nm_block_size /
+ req->nm_frame_size;
+ if (ring->frames_per_block == 0)
+ return -EINVAL;
+ if (ring->frames_per_block * req->nm_block_nr !=
+ req->nm_frame_nr)
+ return -EINVAL;
+
+ order = get_order(req->nm_block_size);
+ pg_vec = alloc_pg_vec(nlk, req, order);
+ if (pg_vec == NULL)
+ return -ENOMEM;
+ } else {
+ if (req->nm_frame_nr)
+ return -EINVAL;
+ }
+
+ err = -EBUSY;
+ mutex_lock(&nlk->pg_vec_lock);
+ if (closing || atomic_read(&nlk->mapped) == 0) {
+ err = 0;
+ spin_lock_bh(&queue->lock);
+
+ ring->frame_max = req->nm_frame_nr - 1;
+ ring->head = 0;
+ ring->frame_size = req->nm_frame_size;
+ ring->pg_vec_pages = req->nm_block_size / PAGE_SIZE;
+
+ swap(ring->pg_vec_len, req->nm_block_nr);
+ swap(ring->pg_vec_order, order);
+ swap(ring->pg_vec, pg_vec);
+
+ __skb_queue_purge(queue);
+ spin_unlock_bh(&queue->lock);
+
+ WARN_ON(atomic_read(&nlk->mapped));
+ }
+ mutex_unlock(&nlk->pg_vec_lock);
+
+ if (pg_vec)
+ free_pg_vec(pg_vec, order, req->nm_block_nr);
+ return err;
+}
+
+static void netlink_mm_open(struct vm_area_struct *vma)
+{
+ struct file *file = vma->vm_file;
+ struct socket *sock = file->private_data;
+ struct sock *sk = sock->sk;
+
+ if (sk)
+ atomic_inc(&nlk_sk(sk)->mapped);
+}
+
+static void netlink_mm_close(struct vm_area_struct *vma)
+{
+ struct file *file = vma->vm_file;
+ struct socket *sock = file->private_data;
+ struct sock *sk = sock->sk;
+
+ if (sk)
+ atomic_dec(&nlk_sk(sk)->mapped);
+}
+
+static const struct vm_operations_struct netlink_mmap_ops = {
+ .open = netlink_mm_open,
+ .close = netlink_mm_close,
+};
+
+static int netlink_mmap(struct file *file, struct socket *sock,
+ struct vm_area_struct *vma)
+{
+ struct sock *sk = sock->sk;
+ struct netlink_sock *nlk = nlk_sk(sk);
+ struct netlink_ring *ring;
+ unsigned long start, size, expected;
+ unsigned int i;
+ int err = -EINVAL;
+
+ if (vma->vm_pgoff)
+ return -EINVAL;
+
+ mutex_lock(&nlk->pg_vec_lock);
+
+ expected = 0;
+ for (ring = &nlk->rx_ring; ring <= &nlk->tx_ring; ring++) {
+ if (ring->pg_vec == NULL)
+ continue;
+ expected += ring->pg_vec_len * ring->pg_vec_pages * PAGE_SIZE;
+ }
+
+ if (expected == 0)
+ goto out;
+
+ size = vma->vm_end - vma->vm_start;
+ if (size != expected)
+ goto out;
+
+ start = vma->vm_start;
+ for (ring = &nlk->rx_ring; ring <= &nlk->tx_ring; ring++) {
+ if (ring->pg_vec == NULL)
+ continue;
+
+ for (i = 0; i < ring->pg_vec_len; i++) {
+ struct page *page;
+ void *kaddr = ring->pg_vec[i];
+ unsigned int pg_num;
+
+ for (pg_num = 0; pg_num < ring->pg_vec_pages; pg_num++) {
+ page = pgvec_to_page(kaddr);
+ err = vm_insert_page(vma, start, page);
+ if (err < 0)
+ goto out;
+ start += PAGE_SIZE;
+ kaddr += PAGE_SIZE;
+ }
+ }
+ }
+
+ atomic_inc(&nlk->mapped);
+ vma->vm_ops = &netlink_mmap_ops;
+ err = 0;
+out:
+ mutex_unlock(&nlk->pg_vec_lock);
+ return err;
+}
+
+static void netlink_frame_flush_dcache(const struct nl_mmap_hdr *hdr, unsigned int nm_len)
+{
+#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1
+ struct page *p_start, *p_end;
+
+ /* First page is flushed through netlink_{get,set}_status */
+ p_start = pgvec_to_page(hdr + PAGE_SIZE);
+ p_end = pgvec_to_page((void *)hdr + NL_MMAP_HDRLEN + nm_len - 1);
+ while (p_start <= p_end) {
+ flush_dcache_page(p_start);
+ p_start++;
+ }
+#endif
+}
+
+static enum nl_mmap_status netlink_get_status(const struct nl_mmap_hdr *hdr)
+{
+ smp_rmb();
+ flush_dcache_page(pgvec_to_page(hdr));
+ return hdr->nm_status;
+}
+
+static void netlink_set_status(struct nl_mmap_hdr *hdr,
+ enum nl_mmap_status status)
+{
+ smp_mb();
+ hdr->nm_status = status;
+ flush_dcache_page(pgvec_to_page(hdr));
+}
+
+static struct nl_mmap_hdr *
+__netlink_lookup_frame(const struct netlink_ring *ring, unsigned int pos)
+{
+ unsigned int pg_vec_pos, frame_off;
+
+ pg_vec_pos = pos / ring->frames_per_block;
+ frame_off = pos % ring->frames_per_block;
+
+ return ring->pg_vec[pg_vec_pos] + (frame_off * ring->frame_size);
+}
+
+static struct nl_mmap_hdr *
+netlink_lookup_frame(const struct netlink_ring *ring, unsigned int pos,
+ enum nl_mmap_status status)
+{
+ struct nl_mmap_hdr *hdr;
+
+ hdr = __netlink_lookup_frame(ring, pos);
+ if (netlink_get_status(hdr) != status)
+ return NULL;
+
+ return hdr;
+}
+
+static struct nl_mmap_hdr *
+netlink_current_frame(const struct netlink_ring *ring,
+ enum nl_mmap_status status)
+{
+ return netlink_lookup_frame(ring, ring->head, status);
+}
+
+static struct nl_mmap_hdr *
+netlink_previous_frame(const struct netlink_ring *ring,
+ enum nl_mmap_status status)
+{
+ unsigned int prev;
+
+ prev = ring->head ? ring->head - 1 : ring->frame_max;
+ return netlink_lookup_frame(ring, prev, status);
+}
+
+static void netlink_increment_head(struct netlink_ring *ring)
+{
+ ring->head = ring->head != ring->frame_max ? ring->head + 1 : 0;
+}
+
+static void netlink_forward_ring(struct netlink_ring *ring)
+{
+ unsigned int head = ring->head, pos = head;
+ const struct nl_mmap_hdr *hdr;
+
+ do {
+ hdr = __netlink_lookup_frame(ring, pos);
+ if (hdr->nm_status == NL_MMAP_STATUS_UNUSED)
+ break;
+ if (hdr->nm_status != NL_MMAP_STATUS_SKIP)
+ break;
+ netlink_increment_head(ring);
+ } while (ring->head != head);
+}
+
+static bool netlink_dump_space(struct netlink_sock *nlk)
+{
+ struct netlink_ring *ring = &nlk->rx_ring;
+ struct nl_mmap_hdr *hdr;
+ unsigned int n;
+
+ hdr = netlink_current_frame(ring, NL_MMAP_STATUS_UNUSED);
+ if (hdr == NULL)
+ return false;
+
+ n = ring->head + ring->frame_max / 2;
+ if (n > ring->frame_max)
+ n -= ring->frame_max;
+
+ hdr = __netlink_lookup_frame(ring, n);
+
+ return hdr->nm_status == NL_MMAP_STATUS_UNUSED;
+}
+
+static unsigned int netlink_poll(struct file *file, struct socket *sock,
+ poll_table *wait)
+{
+ struct sock *sk = sock->sk;
+ struct netlink_sock *nlk = nlk_sk(sk);
+ unsigned int mask;
+ int err;
+
+ if (nlk->rx_ring.pg_vec != NULL) {
+ /* Memory mapped sockets don't call recvmsg(), so flow control
+ * for dumps is performed here. A dump is allowed to continue
+ * if at least half the ring is unused.
+ */
+ while (nlk->cb_running && netlink_dump_space(nlk)) {
+ err = netlink_dump(sk);
+ if (err < 0) {
+ sk->sk_err = -err;
+ sk->sk_error_report(sk);
+ break;
+ }
+ }
+ netlink_rcv_wake(sk);
+ }
+
+ mask = datagram_poll(file, sock, wait);
+
+ spin_lock_bh(&sk->sk_receive_queue.lock);
+ if (nlk->rx_ring.pg_vec) {
+ netlink_forward_ring(&nlk->rx_ring);
+ if (!netlink_previous_frame(&nlk->rx_ring, NL_MMAP_STATUS_UNUSED))
+ mask |= POLLIN | POLLRDNORM;
+ }
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+
+ spin_lock_bh(&sk->sk_write_queue.lock);
+ if (nlk->tx_ring.pg_vec) {
+ if (netlink_current_frame(&nlk->tx_ring, NL_MMAP_STATUS_UNUSED))
+ mask |= POLLOUT | POLLWRNORM;
+ }
+ spin_unlock_bh(&sk->sk_write_queue.lock);
+
+ return mask;
+}
+
+static struct nl_mmap_hdr *netlink_mmap_hdr(struct sk_buff *skb)
+{
+ return (struct nl_mmap_hdr *)(skb->head - NL_MMAP_HDRLEN);
+}
+
+static void netlink_ring_setup_skb(struct sk_buff *skb, struct sock *sk,
+ struct netlink_ring *ring,
+ struct nl_mmap_hdr *hdr)
+{
+ unsigned int size;
+ void *data;
+
+ size = ring->frame_size - NL_MMAP_HDRLEN;
+ data = (void *)hdr + NL_MMAP_HDRLEN;
+
+ skb->head = data;
+ skb->data = data;
+ skb_reset_tail_pointer(skb);
+ skb->end = skb->tail + size;
+ skb->len = 0;
+
+ skb->destructor = netlink_skb_destructor;
+ NETLINK_CB(skb).flags |= NETLINK_SKB_MMAPED;
+ NETLINK_CB(skb).sk = sk;
+}
+
+static int netlink_mmap_sendmsg(struct sock *sk, struct msghdr *msg,
+ u32 dst_portid, u32 dst_group,
+ struct scm_cookie *scm)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+ struct netlink_ring *ring;
+ struct nl_mmap_hdr *hdr;
+ struct sk_buff *skb;
+ unsigned int maxlen;
+ int err = 0, len = 0;
+
+ mutex_lock(&nlk->pg_vec_lock);
+
+ ring = &nlk->tx_ring;
+ maxlen = ring->frame_size - NL_MMAP_HDRLEN;
+
+ do {
+ unsigned int nm_len;
+
+ hdr = netlink_current_frame(ring, NL_MMAP_STATUS_VALID);
+ if (hdr == NULL) {
+ if (!(msg->msg_flags & MSG_DONTWAIT) &&
+ atomic_read(&nlk->tx_ring.pending))
+ schedule();
+ continue;
+ }
+
+ nm_len = ACCESS_ONCE(hdr->nm_len);
+ if (nm_len > maxlen) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ netlink_frame_flush_dcache(hdr, nm_len);
+
+ skb = alloc_skb(nm_len, GFP_KERNEL);
+ if (skb == NULL) {
+ err = -ENOBUFS;
+ goto out;
+ }
+ __skb_put(skb, nm_len);
+ memcpy(skb->data, (void *)hdr + NL_MMAP_HDRLEN, nm_len);
+ netlink_set_status(hdr, NL_MMAP_STATUS_UNUSED);
+
+ netlink_increment_head(ring);
+
+ NETLINK_CB(skb).portid = nlk->portid;
+ NETLINK_CB(skb).dst_group = dst_group;
+ NETLINK_CB(skb).creds = scm->creds;
+
+ err = security_netlink_send(sk, skb);
+ if (err) {
+ kfree_skb(skb);
+ goto out;
+ }
+
+ if (unlikely(dst_group)) {
+ atomic_inc(&skb->users);
+ netlink_broadcast(sk, skb, dst_portid, dst_group,
+ GFP_KERNEL);
+ }
+ err = netlink_unicast(sk, skb, dst_portid,
+ msg->msg_flags & MSG_DONTWAIT);
+ if (err < 0)
+ goto out;
+ len += err;
+
+ } while (hdr != NULL ||
+ (!(msg->msg_flags & MSG_DONTWAIT) &&
+ atomic_read(&nlk->tx_ring.pending)));
+
+ if (len > 0)
+ err = len;
+out:
+ mutex_unlock(&nlk->pg_vec_lock);
+ return err;
+}
+
+static void netlink_queue_mmaped_skb(struct sock *sk, struct sk_buff *skb)
+{
+ struct nl_mmap_hdr *hdr;
+
+ hdr = netlink_mmap_hdr(skb);
+ hdr->nm_len = skb->len;
+ hdr->nm_group = NETLINK_CB(skb).dst_group;
+ hdr->nm_pid = NETLINK_CB(skb).creds.pid;
+ hdr->nm_uid = from_kuid(sk_user_ns(sk), NETLINK_CB(skb).creds.uid);
+ hdr->nm_gid = from_kgid(sk_user_ns(sk), NETLINK_CB(skb).creds.gid);
+ netlink_frame_flush_dcache(hdr, hdr->nm_len);
+ netlink_set_status(hdr, NL_MMAP_STATUS_VALID);
+
+ NETLINK_CB(skb).flags |= NETLINK_SKB_DELIVERED;
+ kfree_skb(skb);
+}
+
+static void netlink_ring_set_copied(struct sock *sk, struct sk_buff *skb)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+ struct netlink_ring *ring = &nlk->rx_ring;
+ struct nl_mmap_hdr *hdr;
+
+ spin_lock_bh(&sk->sk_receive_queue.lock);
+ hdr = netlink_current_frame(ring, NL_MMAP_STATUS_UNUSED);
+ if (hdr == NULL) {
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+ kfree_skb(skb);
+ netlink_overrun(sk);
+ return;
+ }
+ netlink_increment_head(ring);
+ __skb_queue_tail(&sk->sk_receive_queue, skb);
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+
+ hdr->nm_len = skb->len;
+ hdr->nm_group = NETLINK_CB(skb).dst_group;
+ hdr->nm_pid = NETLINK_CB(skb).creds.pid;
+ hdr->nm_uid = from_kuid(sk_user_ns(sk), NETLINK_CB(skb).creds.uid);
+ hdr->nm_gid = from_kgid(sk_user_ns(sk), NETLINK_CB(skb).creds.gid);
+ netlink_set_status(hdr, NL_MMAP_STATUS_COPY);
+}
+
+#else /* CONFIG_NETLINK_MMAP */
+#define netlink_skb_is_mmaped(skb) false
+#define netlink_rx_is_mmaped(sk) false
+#define netlink_tx_is_mmaped(sk) false
+#define netlink_mmap sock_no_mmap
+#define netlink_poll datagram_poll
+#define netlink_mmap_sendmsg(sk, msg, dst_portid, dst_group, scm) 0
+#endif /* CONFIG_NETLINK_MMAP */
+
+static void netlink_skb_destructor(struct sk_buff *skb)
+{
+#ifdef CONFIG_NETLINK_MMAP
+ struct nl_mmap_hdr *hdr;
+ struct netlink_ring *ring;
+ struct sock *sk;
+
+ /* If a packet from the kernel to userspace was freed because of an
+ * error without being delivered to userspace, the kernel must reset
+ * the status. In the direction userspace to kernel, the status is
+ * always reset here after the packet was processed and freed.
+ */
+ if (netlink_skb_is_mmaped(skb)) {
+ hdr = netlink_mmap_hdr(skb);
+ sk = NETLINK_CB(skb).sk;
+
+ if (NETLINK_CB(skb).flags & NETLINK_SKB_TX) {
+ netlink_set_status(hdr, NL_MMAP_STATUS_UNUSED);
+ ring = &nlk_sk(sk)->tx_ring;
+ } else {
+ if (!(NETLINK_CB(skb).flags & NETLINK_SKB_DELIVERED)) {
+ hdr->nm_len = 0;
+ netlink_set_status(hdr, NL_MMAP_STATUS_VALID);
+ }
+ ring = &nlk_sk(sk)->rx_ring;
+ }
+
+ WARN_ON(atomic_read(&ring->pending) == 0);
+ atomic_dec(&ring->pending);
+ sock_put(sk);
+
+ skb->head = NULL;
+ }
+#endif
+ if (is_vmalloc_addr(skb->head)) {
+ if (!skb->cloned ||
+ !atomic_dec_return(&(skb_shinfo(skb)->dataref)))
+ vfree(skb->head);
+
+ skb->head = NULL;
+ }
+ if (skb->sk != NULL)
+ sock_rfree(skb);
+}
+
+static void netlink_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
+{
+ WARN_ON(skb->sk != NULL);
+ skb->sk = sk;
+ skb->destructor = netlink_skb_destructor;
+ atomic_add(skb->truesize, &sk->sk_rmem_alloc);
+ sk_mem_charge(sk, skb->truesize);
+}
+
+static void netlink_sock_destruct(struct sock *sk)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+
+ if (nlk->cb_running) {
+ if (nlk->cb.done)
+ nlk->cb.done(&nlk->cb);
+
+ module_put(nlk->cb.module);
+ kfree_skb(nlk->cb.skb);
+ }
+
+ skb_queue_purge(&sk->sk_receive_queue);
+#ifdef CONFIG_NETLINK_MMAP
+ if (1) {
+ struct nl_mmap_req req;
+
+ memset(&req, 0, sizeof(req));
+ if (nlk->rx_ring.pg_vec)
+ netlink_set_ring(sk, &req, true, false);
+ memset(&req, 0, sizeof(req));
+ if (nlk->tx_ring.pg_vec)
+ netlink_set_ring(sk, &req, true, true);
+ }
+#endif /* CONFIG_NETLINK_MMAP */
+
+ if (!sock_flag(sk, SOCK_DEAD)) {
+ printk(KERN_ERR "Freeing alive netlink socket %p\n", sk);
+ return;
+ }
+
+ WARN_ON(atomic_read(&sk->sk_rmem_alloc));
+ WARN_ON(atomic_read(&sk->sk_wmem_alloc));
+ WARN_ON(nlk_sk(sk)->groups);
+}
+
+/* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on
+ * SMP. Look, when several writers sleep and reader wakes them up, all but one
+ * immediately hit write lock and grab all the cpus. Exclusive sleep solves
+ * this, _but_ remember, it adds useless work on UP machines.
+ */
+
+void netlink_table_grab(void)
+ __acquires(nl_table_lock)
+{
+ might_sleep();
+
+ write_lock_irq(&nl_table_lock);
+
+ if (atomic_read(&nl_table_users)) {
+ DECLARE_WAITQUEUE(wait, current);
+
+ add_wait_queue_exclusive(&nl_table_wait, &wait);
+ for (;;) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ if (atomic_read(&nl_table_users) == 0)
+ break;
+ write_unlock_irq(&nl_table_lock);
+ schedule();
+ write_lock_irq(&nl_table_lock);
+ }
+
+ __set_current_state(TASK_RUNNING);
+ remove_wait_queue(&nl_table_wait, &wait);
+ }
+}
+
+void netlink_table_ungrab(void)
+ __releases(nl_table_lock)
+{
+ write_unlock_irq(&nl_table_lock);
+ wake_up(&nl_table_wait);
+}
+
+static inline void
+netlink_lock_table(void)
+{
+ /* read_lock() synchronizes us to netlink_table_grab */
+
+ read_lock(&nl_table_lock);
+ atomic_inc(&nl_table_users);
+ read_unlock(&nl_table_lock);
+}
+
+static inline void
+netlink_unlock_table(void)
+{
+ if (atomic_dec_and_test(&nl_table_users))
+ wake_up(&nl_table_wait);
+}
+
+struct netlink_compare_arg
+{
+ possible_net_t pnet;
+ u32 portid;
+};
+
+/* Doing sizeof directly may yield 4 extra bytes on 64-bit. */
+#define netlink_compare_arg_len \
+ (offsetof(struct netlink_compare_arg, portid) + sizeof(u32))
+
+static inline int netlink_compare(struct rhashtable_compare_arg *arg,
+ const void *ptr)
+{
+ const struct netlink_compare_arg *x = arg->key;
+ const struct netlink_sock *nlk = ptr;
+
+ return nlk->portid != x->portid ||
+ !net_eq(sock_net(&nlk->sk), read_pnet(&x->pnet));
+}
+
+static void netlink_compare_arg_init(struct netlink_compare_arg *arg,
+ struct net *net, u32 portid)
+{
+ memset(arg, 0, sizeof(*arg));
+ write_pnet(&arg->pnet, net);
+ arg->portid = portid;
+}
+
+static struct sock *__netlink_lookup(struct netlink_table *table, u32 portid,
+ struct net *net)
+{
+ struct netlink_compare_arg arg;
+
+ netlink_compare_arg_init(&arg, net, portid);
+ return rhashtable_lookup_fast(&table->hash, &arg,
+ netlink_rhashtable_params);
+}
+
+static int __netlink_insert(struct netlink_table *table, struct sock *sk)
+{
+ struct netlink_compare_arg arg;
+
+ netlink_compare_arg_init(&arg, sock_net(sk), nlk_sk(sk)->portid);
+ return rhashtable_lookup_insert_key(&table->hash, &arg,
+ &nlk_sk(sk)->node,
+ netlink_rhashtable_params);
+}
+
+static struct sock *netlink_lookup(struct net *net, int protocol, u32 portid)
+{
+ struct netlink_table *table = &nl_table[protocol];
+ struct sock *sk;
+
+ rcu_read_lock();
+ sk = __netlink_lookup(table, portid, net);
+ if (sk)
+ sock_hold(sk);
+ rcu_read_unlock();
+
+ return sk;
+}
+
+static const struct proto_ops netlink_ops;
+
+static void
+netlink_update_listeners(struct sock *sk)
+{
+ struct netlink_table *tbl = &nl_table[sk->sk_protocol];
+ unsigned long mask;
+ unsigned int i;
+ struct listeners *listeners;
+
+ listeners = nl_deref_protected(tbl->listeners);
+ if (!listeners)
+ return;
+
+ for (i = 0; i < NLGRPLONGS(tbl->groups); i++) {
+ mask = 0;
+ sk_for_each_bound(sk, &tbl->mc_list) {
+ if (i < NLGRPLONGS(nlk_sk(sk)->ngroups))
+ mask |= nlk_sk(sk)->groups[i];
+ }
+ listeners->masks[i] = mask;
+ }
+ /* this function is only called with the netlink table "grabbed", which
+ * makes sure updates are visible before bind or setsockopt return. */
+}
+
+static int netlink_insert(struct sock *sk, u32 portid)
+{
+ struct netlink_table *table = &nl_table[sk->sk_protocol];
+ int err;
+
+ lock_sock(sk);
+
+ err = -EBUSY;
+ if (nlk_sk(sk)->portid)
+ goto err;
+
+ err = -ENOMEM;
+ if (BITS_PER_LONG > 32 &&
+ unlikely(atomic_read(&table->hash.nelems) >= UINT_MAX))
+ goto err;
+
+ nlk_sk(sk)->portid = portid;
+ sock_hold(sk);
+
+ err = __netlink_insert(table, sk);
+ if (err) {
+ if (err == -EEXIST)
+ err = -EADDRINUSE;
+ nlk_sk(sk)->portid = 0;
+ sock_put(sk);
+ }
+
+err:
+ release_sock(sk);
+ return err;
+}
+
+static void netlink_remove(struct sock *sk)
+{
+ struct netlink_table *table;
+
+ table = &nl_table[sk->sk_protocol];
+ if (!rhashtable_remove_fast(&table->hash, &nlk_sk(sk)->node,
+ netlink_rhashtable_params)) {
+ WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
+ __sock_put(sk);
+ }
+
+ netlink_table_grab();
+ if (nlk_sk(sk)->subscriptions) {
+ __sk_del_bind_node(sk);
+ netlink_update_listeners(sk);
+ }
+ if (sk->sk_protocol == NETLINK_GENERIC)
+ atomic_inc(&genl_sk_destructing_cnt);
+ netlink_table_ungrab();
+}
+
+static struct proto netlink_proto = {
+ .name = "NETLINK",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct netlink_sock),
+};
+
+static int __netlink_create(struct net *net, struct socket *sock,
+ struct mutex *cb_mutex, int protocol)
+{
+ struct sock *sk;
+ struct netlink_sock *nlk;
+
+ sock->ops = &netlink_ops;
+
+ sk = sk_alloc(net, PF_NETLINK, GFP_KERNEL, &netlink_proto);
+ if (!sk)
+ return -ENOMEM;
+
+ sock_init_data(sock, sk);
+
+ nlk = nlk_sk(sk);
+ if (cb_mutex) {
+ nlk->cb_mutex = cb_mutex;
+ } else {
+ nlk->cb_mutex = &nlk->cb_def_mutex;
+ mutex_init(nlk->cb_mutex);
+ }
+ init_waitqueue_head(&nlk->wait);
+#ifdef CONFIG_NETLINK_MMAP
+ mutex_init(&nlk->pg_vec_lock);
+#endif
+
+ sk->sk_destruct = netlink_sock_destruct;
+ sk->sk_protocol = protocol;
+ return 0;
+}
+
+static int netlink_create(struct net *net, struct socket *sock, int protocol,
+ int kern)
+{
+ struct module *module = NULL;
+ struct mutex *cb_mutex;
+ struct netlink_sock *nlk;
+ int (*bind)(struct net *net, int group);
+ void (*unbind)(struct net *net, int group);
+ int err = 0;
+
+ sock->state = SS_UNCONNECTED;
+
+ if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
+ return -ESOCKTNOSUPPORT;
+
+ if (protocol < 0 || protocol >= MAX_LINKS)
+ return -EPROTONOSUPPORT;
+
+ netlink_lock_table();
+#ifdef CONFIG_MODULES
+ if (!nl_table[protocol].registered) {
+ netlink_unlock_table();
+ request_module("net-pf-%d-proto-%d", PF_NETLINK, protocol);
+ netlink_lock_table();
+ }
+#endif
+ if (nl_table[protocol].registered &&
+ try_module_get(nl_table[protocol].module))
+ module = nl_table[protocol].module;
+ else
+ err = -EPROTONOSUPPORT;
+ cb_mutex = nl_table[protocol].cb_mutex;
+ bind = nl_table[protocol].bind;
+ unbind = nl_table[protocol].unbind;
+ netlink_unlock_table();
+
+ if (err < 0)
+ goto out;
+
+ err = __netlink_create(net, sock, cb_mutex, protocol);
+ if (err < 0)
+ goto out_module;
+
+ local_bh_disable();
+ sock_prot_inuse_add(net, &netlink_proto, 1);
+ local_bh_enable();
+
+ nlk = nlk_sk(sock->sk);
+ nlk->module = module;
+ nlk->netlink_bind = bind;
+ nlk->netlink_unbind = unbind;
+out:
+ return err;
+
+out_module:
+ module_put(module);
+ goto out;
+}
+
+static void deferred_put_nlk_sk(struct rcu_head *head)
+{
+ struct netlink_sock *nlk = container_of(head, struct netlink_sock, rcu);
+
+ sock_put(&nlk->sk);
+}
+
+static int netlink_release(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+ struct netlink_sock *nlk;
+
+ if (!sk)
+ return 0;
+
+ netlink_remove(sk);
+ sock_orphan(sk);
+ nlk = nlk_sk(sk);
+
+ /*
+ * OK. Socket is unlinked, any packets that arrive now
+ * will be purged.
+ */
+
+ /* must not acquire netlink_table_lock in any way again before unbind
+ * and notifying genetlink is done as otherwise it might deadlock
+ */
+ if (nlk->netlink_unbind) {
+ int i;
+
+ for (i = 0; i < nlk->ngroups; i++)
+ if (test_bit(i, nlk->groups))
+ nlk->netlink_unbind(sock_net(sk), i + 1);
+ }
+ if (sk->sk_protocol == NETLINK_GENERIC &&
+ atomic_dec_return(&genl_sk_destructing_cnt) == 0)
+ wake_up(&genl_sk_destructing_waitq);
+
+ sock->sk = NULL;
+ wake_up_interruptible_all(&nlk->wait);
+
+ skb_queue_purge(&sk->sk_write_queue);
+
+ if (nlk->portid) {
+ struct netlink_notify n = {
+ .net = sock_net(sk),
+ .protocol = sk->sk_protocol,
+ .portid = nlk->portid,
+ };
+ atomic_notifier_call_chain(&netlink_chain,
+ NETLINK_URELEASE, &n);
+ }
+
+ module_put(nlk->module);
+
+ 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;
+
+ old = nl_deref_protected(nl_table[sk->sk_protocol].listeners);
+ RCU_INIT_POINTER(nl_table[sk->sk_protocol].listeners, NULL);
+ kfree_rcu(old, rcu);
+ nl_table[sk->sk_protocol].module = NULL;
+ nl_table[sk->sk_protocol].bind = NULL;
+ nl_table[sk->sk_protocol].unbind = NULL;
+ nl_table[sk->sk_protocol].flags = 0;
+ nl_table[sk->sk_protocol].registered = 0;
+ }
+ netlink_table_ungrab();
+ }
+
+ kfree(nlk->groups);
+ nlk->groups = NULL;
+
+ local_bh_disable();
+ sock_prot_inuse_add(sock_net(sk), &netlink_proto, -1);
+ local_bh_enable();
+ call_rcu(&nlk->rcu, deferred_put_nlk_sk);
+ return 0;
+}
+
+static int netlink_autobind(struct socket *sock)
+{
+ struct sock *sk = sock->sk;
+ struct net *net = sock_net(sk);
+ struct netlink_table *table = &nl_table[sk->sk_protocol];
+ s32 portid = task_tgid_vnr(current);
+ int err;
+ static s32 rover = -4097;
+
+retry:
+ cond_resched();
+ rcu_read_lock();
+ if (__netlink_lookup(table, portid, net)) {
+ /* Bind collision, search negative portid values. */
+ portid = rover--;
+ if (rover > -4097)
+ rover = -4097;
+ rcu_read_unlock();
+ goto retry;
+ }
+ rcu_read_unlock();
+
+ err = netlink_insert(sk, portid);
+ if (err == -EADDRINUSE)
+ goto retry;
+
+ /* If 2 threads race to autobind, that is fine. */
+ if (err == -EBUSY)
+ err = 0;
+
+ return err;
+}
+
+/**
+ * __netlink_ns_capable - General netlink message capability test
+ * @nsp: NETLINK_CB of the socket buffer holding a netlink command from userspace.
+ * @user_ns: The user namespace of the capability to use
+ * @cap: The capability to use
+ *
+ * Test to see if the opener of the socket we received the message
+ * from had when the netlink socket was created and the sender of the
+ * message has has the capability @cap in the user namespace @user_ns.
+ */
+bool __netlink_ns_capable(const struct netlink_skb_parms *nsp,
+ struct user_namespace *user_ns, int cap)
+{
+ return ((nsp->flags & NETLINK_SKB_DST) ||
+ file_ns_capable(nsp->sk->sk_socket->file, user_ns, cap)) &&
+ ns_capable(user_ns, cap);
+}
+EXPORT_SYMBOL(__netlink_ns_capable);
+
+/**
+ * netlink_ns_capable - General netlink message capability test
+ * @skb: socket buffer holding a netlink command from userspace
+ * @user_ns: The user namespace of the capability to use
+ * @cap: The capability to use
+ *
+ * Test to see if the opener of the socket we received the message
+ * from had when the netlink socket was created and the sender of the
+ * message has has the capability @cap in the user namespace @user_ns.
+ */
+bool netlink_ns_capable(const struct sk_buff *skb,
+ struct user_namespace *user_ns, int cap)
+{
+ return __netlink_ns_capable(&NETLINK_CB(skb), user_ns, cap);
+}
+EXPORT_SYMBOL(netlink_ns_capable);
+
+/**
+ * netlink_capable - Netlink global message capability test
+ * @skb: socket buffer holding a netlink command from userspace
+ * @cap: The capability to use
+ *
+ * Test to see if the opener of the socket we received the message
+ * from had when the netlink socket was created and the sender of the
+ * message has has the capability @cap in all user namespaces.
+ */
+bool netlink_capable(const struct sk_buff *skb, int cap)
+{
+ return netlink_ns_capable(skb, &init_user_ns, cap);
+}
+EXPORT_SYMBOL(netlink_capable);
+
+/**
+ * netlink_net_capable - Netlink network namespace message capability test
+ * @skb: socket buffer holding a netlink command from userspace
+ * @cap: The capability to use
+ *
+ * Test to see if the opener of the socket we received the message
+ * from had when the netlink socket was created and the sender of the
+ * message has has the capability @cap over the network namespace of
+ * the socket we received the message from.
+ */
+bool netlink_net_capable(const struct sk_buff *skb, int cap)
+{
+ return netlink_ns_capable(skb, sock_net(skb->sk)->user_ns, cap);
+}
+EXPORT_SYMBOL(netlink_net_capable);
+
+static inline int netlink_allowed(const struct socket *sock, unsigned int flag)
+{
+ return (nl_table[sock->sk->sk_protocol].flags & flag) ||
+ ns_capable(sock_net(sock->sk)->user_ns, 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_realloc_groups(struct sock *sk)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+ unsigned int groups;
+ unsigned long *new_groups;
+ int err = 0;
+
+ netlink_table_grab();
+
+ groups = nl_table[sk->sk_protocol].groups;
+ if (!nl_table[sk->sk_protocol].registered) {
+ err = -ENOENT;
+ goto out_unlock;
+ }
+
+ if (nlk->ngroups >= groups)
+ goto out_unlock;
+
+ new_groups = krealloc(nlk->groups, NLGRPSZ(groups), GFP_ATOMIC);
+ if (new_groups == NULL) {
+ err = -ENOMEM;
+ goto out_unlock;
+ }
+ memset((char *)new_groups + NLGRPSZ(nlk->ngroups), 0,
+ NLGRPSZ(groups) - NLGRPSZ(nlk->ngroups));
+
+ nlk->groups = new_groups;
+ nlk->ngroups = groups;
+ out_unlock:
+ netlink_table_ungrab();
+ return err;
+}
+
+static void netlink_undo_bind(int group, long unsigned int groups,
+ struct sock *sk)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+ int undo;
+
+ if (!nlk->netlink_unbind)
+ return;
+
+ for (undo = 0; undo < group; undo++)
+ if (test_bit(undo, &groups))
+ nlk->netlink_unbind(sock_net(sk), undo + 1);
+}
+
+static int netlink_bind(struct socket *sock, struct sockaddr *addr,
+ int addr_len)
+{
+ struct sock *sk = sock->sk;
+ struct net *net = sock_net(sk);
+ struct netlink_sock *nlk = nlk_sk(sk);
+ struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr;
+ int err;
+ long unsigned int groups = nladdr->nl_groups;
+
+ if (addr_len < sizeof(struct sockaddr_nl))
+ return -EINVAL;
+
+ if (nladdr->nl_family != AF_NETLINK)
+ return -EINVAL;
+
+ /* Only superuser is allowed to listen multicasts */
+ if (groups) {
+ if (!netlink_allowed(sock, NL_CFG_F_NONROOT_RECV))
+ return -EPERM;
+ err = netlink_realloc_groups(sk);
+ if (err)
+ return err;
+ }
+
+ if (nlk->portid)
+ if (nladdr->nl_pid != nlk->portid)
+ return -EINVAL;
+
+ if (nlk->netlink_bind && groups) {
+ int group;
+
+ for (group = 0; group < nlk->ngroups; group++) {
+ if (!test_bit(group, &groups))
+ continue;
+ err = nlk->netlink_bind(net, group + 1);
+ if (!err)
+ continue;
+ netlink_undo_bind(group, groups, sk);
+ return err;
+ }
+ }
+
+ if (!nlk->portid) {
+ err = nladdr->nl_pid ?
+ netlink_insert(sk, nladdr->nl_pid) :
+ netlink_autobind(sock);
+ if (err) {
+ netlink_undo_bind(nlk->ngroups, groups, sk);
+ return err;
+ }
+ }
+
+ if (!groups && (nlk->groups == NULL || !(u32)nlk->groups[0]))
+ return 0;
+
+ netlink_table_grab();
+ netlink_update_subscriptions(sk, nlk->subscriptions +
+ hweight32(groups) -
+ hweight32(nlk->groups[0]));
+ nlk->groups[0] = (nlk->groups[0] & ~0xffffffffUL) | groups;
+ netlink_update_listeners(sk);
+ netlink_table_ungrab();
+
+ return 0;
+}
+
+static int netlink_connect(struct socket *sock, struct sockaddr *addr,
+ int alen, int flags)
+{
+ int err = 0;
+ struct sock *sk = sock->sk;
+ struct netlink_sock *nlk = nlk_sk(sk);
+ struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr;
+
+ if (alen < sizeof(addr->sa_family))
+ return -EINVAL;
+
+ if (addr->sa_family == AF_UNSPEC) {
+ sk->sk_state = NETLINK_UNCONNECTED;
+ nlk->dst_portid = 0;
+ nlk->dst_group = 0;
+ return 0;
+ }
+ if (addr->sa_family != AF_NETLINK)
+ return -EINVAL;
+
+ if ((nladdr->nl_groups || nladdr->nl_pid) &&
+ !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND))
+ return -EPERM;
+
+ if (!nlk->portid)
+ err = netlink_autobind(sock);
+
+ if (err == 0) {
+ sk->sk_state = NETLINK_CONNECTED;
+ nlk->dst_portid = nladdr->nl_pid;
+ nlk->dst_group = ffs(nladdr->nl_groups);
+ }
+
+ return err;
+}
+
+static int netlink_getname(struct socket *sock, struct sockaddr *addr,
+ int *addr_len, int peer)
+{
+ struct sock *sk = sock->sk;
+ struct netlink_sock *nlk = nlk_sk(sk);
+ DECLARE_SOCKADDR(struct sockaddr_nl *, nladdr, addr);
+
+ nladdr->nl_family = AF_NETLINK;
+ nladdr->nl_pad = 0;
+ *addr_len = sizeof(*nladdr);
+
+ if (peer) {
+ nladdr->nl_pid = nlk->dst_portid;
+ nladdr->nl_groups = netlink_group_mask(nlk->dst_group);
+ } else {
+ nladdr->nl_pid = nlk->portid;
+ nladdr->nl_groups = nlk->groups ? nlk->groups[0] : 0;
+ }
+ return 0;
+}
+
+static struct sock *netlink_getsockbyportid(struct sock *ssk, u32 portid)
+{
+ struct sock *sock;
+ struct netlink_sock *nlk;
+
+ sock = netlink_lookup(sock_net(ssk), ssk->sk_protocol, portid);
+ if (!sock)
+ return ERR_PTR(-ECONNREFUSED);
+
+ /* Don't bother queuing skb if kernel socket has no input function */
+ nlk = nlk_sk(sock);
+ if (sock->sk_state == NETLINK_CONNECTED &&
+ nlk->dst_portid != nlk_sk(ssk)->portid) {
+ sock_put(sock);
+ return ERR_PTR(-ECONNREFUSED);
+ }
+ return sock;
+}
+
+struct sock *netlink_getsockbyfilp(struct file *filp)
+{
+ struct inode *inode = file_inode(filp);
+ struct sock *sock;
+
+ if (!S_ISSOCK(inode->i_mode))
+ return ERR_PTR(-ENOTSOCK);
+
+ sock = SOCKET_I(inode)->sk;
+ if (sock->sk_family != AF_NETLINK)
+ return ERR_PTR(-EINVAL);
+
+ sock_hold(sock);
+ return sock;
+}
+
+static struct sk_buff *netlink_alloc_large_skb(unsigned int size,
+ int broadcast)
+{
+ struct sk_buff *skb;
+ void *data;
+
+ if (size <= NLMSG_GOODSIZE || broadcast)
+ return alloc_skb(size, GFP_KERNEL);
+
+ size = SKB_DATA_ALIGN(size) +
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
+
+ data = vmalloc(size);
+ if (data == NULL)
+ return NULL;
+
+ skb = __build_skb(data, size);
+ if (skb == NULL)
+ vfree(data);
+ else
+ skb->destructor = netlink_skb_destructor;
+
+ return skb;
+}
+
+/*
+ * Attach a skb to a netlink socket.
+ * The caller must hold a reference to the destination socket. On error, the
+ * reference is dropped. The skb is not send to the destination, just all
+ * all error checks are performed and memory in the queue is reserved.
+ * Return values:
+ * < 0: error. skb freed, reference to sock dropped.
+ * 0: continue
+ * 1: repeat lookup - reference dropped while waiting for socket memory.
+ */
+int netlink_attachskb(struct sock *sk, struct sk_buff *skb,
+ long *timeo, struct sock *ssk)
+{
+ struct netlink_sock *nlk;
+
+ nlk = nlk_sk(sk);
+
+ if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf ||
+ test_bit(NETLINK_CONGESTED, &nlk->state)) &&
+ !netlink_skb_is_mmaped(skb)) {
+ DECLARE_WAITQUEUE(wait, current);
+ if (!*timeo) {
+ if (!ssk || netlink_is_kernel(ssk))
+ netlink_overrun(sk);
+ sock_put(sk);
+ kfree_skb(skb);
+ return -EAGAIN;
+ }
+
+ __set_current_state(TASK_INTERRUPTIBLE);
+ add_wait_queue(&nlk->wait, &wait);
+
+ if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf ||
+ test_bit(NETLINK_CONGESTED, &nlk->state)) &&
+ !sock_flag(sk, SOCK_DEAD))
+ *timeo = schedule_timeout(*timeo);
+
+ __set_current_state(TASK_RUNNING);
+ remove_wait_queue(&nlk->wait, &wait);
+ sock_put(sk);
+
+ if (signal_pending(current)) {
+ kfree_skb(skb);
+ return sock_intr_errno(*timeo);
+ }
+ return 1;
+ }
+ netlink_skb_set_owner_r(skb, sk);
+ return 0;
+}
+
+static int __netlink_sendskb(struct sock *sk, struct sk_buff *skb)
+{
+ int len = skb->len;
+
+ netlink_deliver_tap(skb);
+
+#ifdef CONFIG_NETLINK_MMAP
+ if (netlink_skb_is_mmaped(skb))
+ netlink_queue_mmaped_skb(sk, skb);
+ else if (netlink_rx_is_mmaped(sk))
+ netlink_ring_set_copied(sk, skb);
+ else
+#endif /* CONFIG_NETLINK_MMAP */
+ skb_queue_tail(&sk->sk_receive_queue, skb);
+ sk->sk_data_ready(sk);
+ return len;
+}
+
+int netlink_sendskb(struct sock *sk, struct sk_buff *skb)
+{
+ int len = __netlink_sendskb(sk, skb);
+
+ sock_put(sk);
+ return len;
+}
+
+void netlink_detachskb(struct sock *sk, struct sk_buff *skb)
+{
+ kfree_skb(skb);
+ sock_put(sk);
+}
+
+static struct sk_buff *netlink_trim(struct sk_buff *skb, gfp_t allocation)
+{
+ int delta;
+
+ WARN_ON(skb->sk != NULL);
+ if (netlink_skb_is_mmaped(skb))
+ return skb;
+
+ delta = skb->end - skb->tail;
+ if (is_vmalloc_addr(skb->head) || delta * 2 < skb->truesize)
+ return skb;
+
+ if (skb_shared(skb)) {
+ struct sk_buff *nskb = skb_clone(skb, allocation);
+ if (!nskb)
+ return skb;
+ consume_skb(skb);
+ skb = nskb;
+ }
+
+ if (!pskb_expand_head(skb, 0, -delta, allocation))
+ skb->truesize -= delta;
+
+ return skb;
+}
+
+static int netlink_unicast_kernel(struct sock *sk, struct sk_buff *skb,
+ struct sock *ssk)
+{
+ int ret;
+ struct netlink_sock *nlk = nlk_sk(sk);
+
+ ret = -ECONNREFUSED;
+ if (nlk->netlink_rcv != NULL) {
+ ret = skb->len;
+ netlink_skb_set_owner_r(skb, sk);
+ NETLINK_CB(skb).sk = ssk;
+ netlink_deliver_tap_kernel(sk, ssk, skb);
+ nlk->netlink_rcv(skb);
+ consume_skb(skb);
+ } else {
+ kfree_skb(skb);
+ }
+ sock_put(sk);
+ return ret;
+}
+
+int netlink_unicast(struct sock *ssk, struct sk_buff *skb,
+ u32 portid, int nonblock)
+{
+ struct sock *sk;
+ int err;
+ long timeo;
+
+ skb = netlink_trim(skb, gfp_any());
+
+ timeo = sock_sndtimeo(ssk, nonblock);
+retry:
+ sk = netlink_getsockbyportid(ssk, portid);
+ if (IS_ERR(sk)) {
+ kfree_skb(skb);
+ return PTR_ERR(sk);
+ }
+ if (netlink_is_kernel(sk))
+ return netlink_unicast_kernel(sk, skb, ssk);
+
+ if (sk_filter(sk, skb)) {
+ err = skb->len;
+ kfree_skb(skb);
+ sock_put(sk);
+ return err;
+ }
+
+ err = netlink_attachskb(sk, skb, &timeo, ssk);
+ if (err == 1)
+ goto retry;
+ if (err)
+ return err;
+
+ return netlink_sendskb(sk, skb);
+}
+EXPORT_SYMBOL(netlink_unicast);
+
+struct sk_buff *netlink_alloc_skb(struct sock *ssk, unsigned int size,
+ u32 dst_portid, gfp_t gfp_mask)
+{
+#ifdef CONFIG_NETLINK_MMAP
+ struct sock *sk = NULL;
+ struct sk_buff *skb;
+ struct netlink_ring *ring;
+ struct nl_mmap_hdr *hdr;
+ unsigned int maxlen;
+
+ sk = netlink_getsockbyportid(ssk, dst_portid);
+ if (IS_ERR(sk))
+ goto out;
+
+ ring = &nlk_sk(sk)->rx_ring;
+ /* fast-path without atomic ops for common case: non-mmaped receiver */
+ if (ring->pg_vec == NULL)
+ goto out_put;
+
+ if (ring->frame_size - NL_MMAP_HDRLEN < size)
+ goto out_put;
+
+ skb = alloc_skb_head(gfp_mask);
+ if (skb == NULL)
+ goto err1;
+
+ spin_lock_bh(&sk->sk_receive_queue.lock);
+ /* check again under lock */
+ if (ring->pg_vec == NULL)
+ goto out_free;
+
+ /* check again under lock */
+ maxlen = ring->frame_size - NL_MMAP_HDRLEN;
+ if (maxlen < size)
+ goto out_free;
+
+ netlink_forward_ring(ring);
+ hdr = netlink_current_frame(ring, NL_MMAP_STATUS_UNUSED);
+ if (hdr == NULL)
+ goto err2;
+ netlink_ring_setup_skb(skb, sk, ring, hdr);
+ netlink_set_status(hdr, NL_MMAP_STATUS_RESERVED);
+ atomic_inc(&ring->pending);
+ netlink_increment_head(ring);
+
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+ return skb;
+
+err2:
+ kfree_skb(skb);
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+ netlink_overrun(sk);
+err1:
+ sock_put(sk);
+ return NULL;
+
+out_free:
+ kfree_skb(skb);
+ spin_unlock_bh(&sk->sk_receive_queue.lock);
+out_put:
+ sock_put(sk);
+out:
+#endif
+ return alloc_skb(size, gfp_mask);
+}
+EXPORT_SYMBOL_GPL(netlink_alloc_skb);
+
+int netlink_has_listeners(struct sock *sk, unsigned int group)
+{
+ int res = 0;
+ struct listeners *listeners;
+
+ BUG_ON(!netlink_is_kernel(sk));
+
+ rcu_read_lock();
+ listeners = rcu_dereference(nl_table[sk->sk_protocol].listeners);
+
+ if (listeners && group - 1 < nl_table[sk->sk_protocol].groups)
+ res = test_bit(group - 1, listeners->masks);
+
+ rcu_read_unlock();
+
+ return res;
+}
+EXPORT_SYMBOL_GPL(netlink_has_listeners);
+
+static int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+
+ if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf &&
+ !test_bit(NETLINK_CONGESTED, &nlk->state)) {
+ netlink_skb_set_owner_r(skb, sk);
+ __netlink_sendskb(sk, skb);
+ return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1);
+ }
+ return -1;
+}
+
+struct netlink_broadcast_data {
+ struct sock *exclude_sk;
+ struct net *net;
+ u32 portid;
+ u32 group;
+ int failure;
+ int delivery_failure;
+ int congested;
+ int delivered;
+ gfp_t allocation;
+ struct sk_buff *skb, *skb2;
+ int (*tx_filter)(struct sock *dsk, struct sk_buff *skb, void *data);
+ void *tx_data;
+};
+
+static void do_one_broadcast(struct sock *sk,
+ struct netlink_broadcast_data *p)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+ int val;
+
+ if (p->exclude_sk == sk)
+ return;
+
+ if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups ||
+ !test_bit(p->group - 1, nlk->groups))
+ return;
+
+ if (!net_eq(sock_net(sk), p->net))
+ return;
+
+ if (p->failure) {
+ netlink_overrun(sk);
+ return;
+ }
+
+ sock_hold(sk);
+ if (p->skb2 == NULL) {
+ if (skb_shared(p->skb)) {
+ p->skb2 = skb_clone(p->skb, p->allocation);
+ } else {
+ p->skb2 = skb_get(p->skb);
+ /*
+ * skb ownership may have been set when
+ * delivered to a previous socket.
+ */
+ skb_orphan(p->skb2);
+ }
+ }
+ if (p->skb2 == NULL) {
+ netlink_overrun(sk);
+ /* Clone failed. Notify ALL listeners. */
+ p->failure = 1;
+ if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR)
+ p->delivery_failure = 1;
+ } else if (p->tx_filter && p->tx_filter(sk, p->skb2, p->tx_data)) {
+ kfree_skb(p->skb2);
+ p->skb2 = NULL;
+ } else if (sk_filter(sk, p->skb2)) {
+ kfree_skb(p->skb2);
+ p->skb2 = NULL;
+ } else if ((val = netlink_broadcast_deliver(sk, p->skb2)) < 0) {
+ netlink_overrun(sk);
+ if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR)
+ p->delivery_failure = 1;
+ } else {
+ p->congested |= val;
+ p->delivered = 1;
+ p->skb2 = NULL;
+ }
+ sock_put(sk);
+}
+
+int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, u32 portid,
+ u32 group, gfp_t allocation,
+ int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
+ void *filter_data)
+{
+ struct net *net = sock_net(ssk);
+ struct netlink_broadcast_data info;
+ struct sock *sk;
+
+ skb = netlink_trim(skb, allocation);
+
+ info.exclude_sk = ssk;
+ info.net = net;
+ info.portid = portid;
+ info.group = group;
+ info.failure = 0;
+ info.delivery_failure = 0;
+ info.congested = 0;
+ info.delivered = 0;
+ info.allocation = allocation;
+ info.skb = skb;
+ info.skb2 = NULL;
+ info.tx_filter = filter;
+ info.tx_data = filter_data;
+
+ /* While we sleep in clone, do not allow to change socket list */
+
+ netlink_lock_table();
+
+ sk_for_each_bound(sk, &nl_table[ssk->sk_protocol].mc_list)
+ do_one_broadcast(sk, &info);
+
+ consume_skb(skb);
+
+ netlink_unlock_table();
+
+ if (info.delivery_failure) {
+ kfree_skb(info.skb2);
+ return -ENOBUFS;
+ }
+ consume_skb(info.skb2);
+
+ if (info.delivered) {
+ if (info.congested && (allocation & __GFP_WAIT))
+ yield();
+ return 0;
+ }
+ return -ESRCH;
+}
+EXPORT_SYMBOL(netlink_broadcast_filtered);
+
+int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 portid,
+ u32 group, gfp_t allocation)
+{
+ return netlink_broadcast_filtered(ssk, skb, portid, group, allocation,
+ NULL, NULL);
+}
+EXPORT_SYMBOL(netlink_broadcast);
+
+struct netlink_set_err_data {
+ struct sock *exclude_sk;
+ u32 portid;
+ u32 group;
+ int code;
+};
+
+static int do_one_set_err(struct sock *sk, struct netlink_set_err_data *p)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+ int ret = 0;
+
+ if (sk == p->exclude_sk)
+ goto out;
+
+ if (!net_eq(sock_net(sk), sock_net(p->exclude_sk)))
+ goto out;
+
+ if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups ||
+ !test_bit(p->group - 1, nlk->groups))
+ goto out;
+
+ if (p->code == ENOBUFS && nlk->flags & NETLINK_RECV_NO_ENOBUFS) {
+ ret = 1;
+ goto out;
+ }
+
+ sk->sk_err = p->code;
+ sk->sk_error_report(sk);
+out:
+ return ret;
+}
+
+/**
+ * netlink_set_err - report error to broadcast listeners
+ * @ssk: the kernel netlink socket, as returned by netlink_kernel_create()
+ * @portid: the PORTID of a process that we want to skip (if any)
+ * @group: the broadcast group that will notice the error
+ * @code: error code, must be negative (as usual in kernelspace)
+ *
+ * This function returns the number of broadcast listeners that have set the
+ * NETLINK_RECV_NO_ENOBUFS socket option.
+ */
+int netlink_set_err(struct sock *ssk, u32 portid, u32 group, int code)
+{
+ struct netlink_set_err_data info;
+ struct sock *sk;
+ int ret = 0;
+
+ info.exclude_sk = ssk;
+ info.portid = portid;
+ info.group = group;
+ /* sk->sk_err wants a positive error value */
+ info.code = -code;
+
+ read_lock(&nl_table_lock);
+
+ sk_for_each_bound(sk, &nl_table[ssk->sk_protocol].mc_list)
+ ret += do_one_set_err(sk, &info);
+
+ read_unlock(&nl_table_lock);
+ return ret;
+}
+EXPORT_SYMBOL(netlink_set_err);
+
+/* must be called with netlink table grabbed */
+static void netlink_update_socket_mc(struct netlink_sock *nlk,
+ unsigned int group,
+ int is_new)
+{
+ int old, new = !!is_new, subscriptions;
+
+ old = test_bit(group - 1, nlk->groups);
+ subscriptions = nlk->subscriptions - old + new;
+ if (new)
+ __set_bit(group - 1, nlk->groups);
+ else
+ __clear_bit(group - 1, nlk->groups);
+ netlink_update_subscriptions(&nlk->sk, subscriptions);
+ netlink_update_listeners(&nlk->sk);
+}
+
+static int netlink_setsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, unsigned int optlen)
+{
+ struct sock *sk = sock->sk;
+ struct netlink_sock *nlk = nlk_sk(sk);
+ unsigned int val = 0;
+ int err;
+
+ if (level != SOL_NETLINK)
+ return -ENOPROTOOPT;
+
+ if (optname != NETLINK_RX_RING && optname != NETLINK_TX_RING &&
+ optlen >= sizeof(int) &&
+ get_user(val, (unsigned int __user *)optval))
+ return -EFAULT;
+
+ switch (optname) {
+ case NETLINK_PKTINFO:
+ if (val)
+ nlk->flags |= NETLINK_RECV_PKTINFO;
+ else
+ nlk->flags &= ~NETLINK_RECV_PKTINFO;
+ err = 0;
+ break;
+ case NETLINK_ADD_MEMBERSHIP:
+ case NETLINK_DROP_MEMBERSHIP: {
+ if (!netlink_allowed(sock, NL_CFG_F_NONROOT_RECV))
+ return -EPERM;
+ err = netlink_realloc_groups(sk);
+ if (err)
+ return err;
+ if (!val || val - 1 >= nlk->ngroups)
+ return -EINVAL;
+ if (optname == NETLINK_ADD_MEMBERSHIP && nlk->netlink_bind) {
+ err = nlk->netlink_bind(sock_net(sk), val);
+ if (err)
+ return err;
+ }
+ netlink_table_grab();
+ netlink_update_socket_mc(nlk, val,
+ optname == NETLINK_ADD_MEMBERSHIP);
+ netlink_table_ungrab();
+ if (optname == NETLINK_DROP_MEMBERSHIP && nlk->netlink_unbind)
+ nlk->netlink_unbind(sock_net(sk), val);
+
+ err = 0;
+ break;
+ }
+ case NETLINK_BROADCAST_ERROR:
+ if (val)
+ nlk->flags |= NETLINK_BROADCAST_SEND_ERROR;
+ else
+ nlk->flags &= ~NETLINK_BROADCAST_SEND_ERROR;
+ err = 0;
+ break;
+ case NETLINK_NO_ENOBUFS:
+ if (val) {
+ nlk->flags |= NETLINK_RECV_NO_ENOBUFS;
+ clear_bit(NETLINK_CONGESTED, &nlk->state);
+ wake_up_interruptible(&nlk->wait);
+ } else {
+ nlk->flags &= ~NETLINK_RECV_NO_ENOBUFS;
+ }
+ err = 0;
+ break;
+#ifdef CONFIG_NETLINK_MMAP
+ case NETLINK_RX_RING:
+ case NETLINK_TX_RING: {
+ struct nl_mmap_req req;
+
+ /* Rings might consume more memory than queue limits, require
+ * CAP_NET_ADMIN.
+ */
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+ if (optlen < sizeof(req))
+ return -EINVAL;
+ if (copy_from_user(&req, optval, sizeof(req)))
+ return -EFAULT;
+ err = netlink_set_ring(sk, &req, false,
+ optname == NETLINK_TX_RING);
+ break;
+ }
+#endif /* CONFIG_NETLINK_MMAP */
+ default:
+ err = -ENOPROTOOPT;
+ }
+ return err;
+}
+
+static int netlink_getsockopt(struct socket *sock, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ struct sock *sk = sock->sk;
+ struct netlink_sock *nlk = nlk_sk(sk);
+ int len, val, err;
+
+ if (level != SOL_NETLINK)
+ return -ENOPROTOOPT;
+
+ if (get_user(len, optlen))
+ return -EFAULT;
+ if (len < 0)
+ return -EINVAL;
+
+ switch (optname) {
+ case NETLINK_PKTINFO:
+ if (len < sizeof(int))
+ return -EINVAL;
+ len = sizeof(int);
+ val = nlk->flags & NETLINK_RECV_PKTINFO ? 1 : 0;
+ if (put_user(len, optlen) ||
+ put_user(val, optval))
+ return -EFAULT;
+ err = 0;
+ break;
+ case NETLINK_BROADCAST_ERROR:
+ if (len < sizeof(int))
+ return -EINVAL;
+ len = sizeof(int);
+ val = nlk->flags & NETLINK_BROADCAST_SEND_ERROR ? 1 : 0;
+ if (put_user(len, optlen) ||
+ put_user(val, optval))
+ return -EFAULT;
+ err = 0;
+ break;
+ case NETLINK_NO_ENOBUFS:
+ if (len < sizeof(int))
+ return -EINVAL;
+ len = sizeof(int);
+ val = nlk->flags & NETLINK_RECV_NO_ENOBUFS ? 1 : 0;
+ if (put_user(len, optlen) ||
+ put_user(val, optval))
+ return -EFAULT;
+ err = 0;
+ break;
+ default:
+ err = -ENOPROTOOPT;
+ }
+ return err;
+}
+
+static void netlink_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
+{
+ struct nl_pktinfo info;
+
+ info.group = NETLINK_CB(skb).dst_group;
+ put_cmsg(msg, SOL_NETLINK, NETLINK_PKTINFO, sizeof(info), &info);
+}
+
+static int netlink_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
+{
+ struct sock *sk = sock->sk;
+ struct netlink_sock *nlk = nlk_sk(sk);
+ DECLARE_SOCKADDR(struct sockaddr_nl *, addr, msg->msg_name);
+ u32 dst_portid;
+ u32 dst_group;
+ struct sk_buff *skb;
+ int err;
+ struct scm_cookie scm;
+ u32 netlink_skb_flags = 0;
+
+ if (msg->msg_flags&MSG_OOB)
+ return -EOPNOTSUPP;
+
+ err = scm_send(sock, msg, &scm, true);
+ if (err < 0)
+ return err;
+
+ if (msg->msg_namelen) {
+ err = -EINVAL;
+ if (addr->nl_family != AF_NETLINK)
+ goto out;
+ dst_portid = addr->nl_pid;
+ dst_group = ffs(addr->nl_groups);
+ err = -EPERM;
+ if ((dst_group || dst_portid) &&
+ !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND))
+ goto out;
+ netlink_skb_flags |= NETLINK_SKB_DST;
+ } else {
+ dst_portid = nlk->dst_portid;
+ dst_group = nlk->dst_group;
+ }
+
+ if (!nlk->portid) {
+ err = netlink_autobind(sock);
+ if (err)
+ goto out;
+ }
+
+ /* It's a really convoluted way for userland to ask for mmaped
+ * sendmsg(), but that's what we've got...
+ */
+ if (netlink_tx_is_mmaped(sk) &&
+ msg->msg_iter.type == ITER_IOVEC &&
+ msg->msg_iter.nr_segs == 1 &&
+ msg->msg_iter.iov->iov_base == NULL) {
+ err = netlink_mmap_sendmsg(sk, msg, dst_portid, dst_group,
+ &scm);
+ goto out;
+ }
+
+ err = -EMSGSIZE;
+ if (len > sk->sk_sndbuf - 32)
+ goto out;
+ err = -ENOBUFS;
+ skb = netlink_alloc_large_skb(len, dst_group);
+ if (skb == NULL)
+ goto out;
+
+ NETLINK_CB(skb).portid = nlk->portid;
+ NETLINK_CB(skb).dst_group = dst_group;
+ NETLINK_CB(skb).creds = scm.creds;
+ NETLINK_CB(skb).flags = netlink_skb_flags;
+
+ err = -EFAULT;
+ if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
+ kfree_skb(skb);
+ goto out;
+ }
+
+ err = security_netlink_send(sk, skb);
+ if (err) {
+ kfree_skb(skb);
+ goto out;
+ }
+
+ if (dst_group) {
+ atomic_inc(&skb->users);
+ netlink_broadcast(sk, skb, dst_portid, dst_group, GFP_KERNEL);
+ }
+ err = netlink_unicast(sk, skb, dst_portid, msg->msg_flags&MSG_DONTWAIT);
+
+out:
+ scm_destroy(&scm);
+ return err;
+}
+
+static int netlink_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
+ int flags)
+{
+ struct scm_cookie scm;
+ struct sock *sk = sock->sk;
+ struct netlink_sock *nlk = nlk_sk(sk);
+ int noblock = flags&MSG_DONTWAIT;
+ size_t copied;
+ struct sk_buff *skb, *data_skb;
+ int err, ret;
+
+ if (flags&MSG_OOB)
+ return -EOPNOTSUPP;
+
+ copied = 0;
+
+ skb = skb_recv_datagram(sk, flags, noblock, &err);
+ if (skb == NULL)
+ goto out;
+
+ data_skb = skb;
+
+#ifdef CONFIG_COMPAT_NETLINK_MESSAGES
+ if (unlikely(skb_shinfo(skb)->frag_list)) {
+ /*
+ * If this skb has a frag_list, then here that means that we
+ * will have to use the frag_list skb's data for compat tasks
+ * and the regular skb's data for normal (non-compat) tasks.
+ *
+ * If we need to send the compat skb, assign it to the
+ * 'data_skb' variable so that it will be used below for data
+ * copying. We keep 'skb' for everything else, including
+ * freeing both later.
+ */
+ if (flags & MSG_CMSG_COMPAT)
+ data_skb = skb_shinfo(skb)->frag_list;
+ }
+#endif
+
+ /* Record the max length of recvmsg() calls for future allocations */
+ nlk->max_recvmsg_len = max(nlk->max_recvmsg_len, len);
+ nlk->max_recvmsg_len = min_t(size_t, nlk->max_recvmsg_len,
+ 16384);
+
+ copied = data_skb->len;
+ if (len < copied) {
+ msg->msg_flags |= MSG_TRUNC;
+ copied = len;
+ }
+
+ skb_reset_transport_header(data_skb);
+ err = skb_copy_datagram_msg(data_skb, 0, msg, copied);
+
+ if (msg->msg_name) {
+ DECLARE_SOCKADDR(struct sockaddr_nl *, addr, msg->msg_name);
+ addr->nl_family = AF_NETLINK;
+ addr->nl_pad = 0;
+ addr->nl_pid = NETLINK_CB(skb).portid;
+ addr->nl_groups = netlink_group_mask(NETLINK_CB(skb).dst_group);
+ msg->msg_namelen = sizeof(*addr);
+ }
+
+ if (nlk->flags & NETLINK_RECV_PKTINFO)
+ netlink_cmsg_recv_pktinfo(msg, skb);
+
+ memset(&scm, 0, sizeof(scm));
+ scm.creds = *NETLINK_CREDS(skb);
+ if (flags & MSG_TRUNC)
+ copied = data_skb->len;
+
+ skb_free_datagram(sk, skb);
+
+ if (nlk->cb_running &&
+ atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2) {
+ ret = netlink_dump(sk);
+ if (ret) {
+ sk->sk_err = -ret;
+ sk->sk_error_report(sk);
+ }
+ }
+
+ scm_recv(sock, msg, &scm, flags);
+out:
+ netlink_rcv_wake(sk);
+ return err ? : copied;
+}
+
+static void netlink_data_ready(struct sock *sk)
+{
+ BUG();
+}
+
+/*
+ * We export these functions to other modules. They provide a
+ * complete set of kernel non-blocking support for message
+ * queueing.
+ */
+
+struct sock *
+__netlink_kernel_create(struct net *net, int unit, struct module *module,
+ struct netlink_kernel_cfg *cfg)
+{
+ struct socket *sock;
+ struct sock *sk;
+ struct netlink_sock *nlk;
+ struct listeners *listeners = NULL;
+ struct mutex *cb_mutex = cfg ? cfg->cb_mutex : NULL;
+ unsigned int groups;
+
+ BUG_ON(!nl_table);
+
+ if (unit < 0 || unit >= MAX_LINKS)
+ return NULL;
+
+ if (sock_create_lite(PF_NETLINK, SOCK_DGRAM, unit, &sock))
+ return NULL;
+
+ /*
+ * We have to just have a reference on the net from sk, but don't
+ * get_net it. Besides, we cannot get and then put the net here.
+ * So we create one inside init_net and the move it to net.
+ */
+
+ if (__netlink_create(&init_net, sock, cb_mutex, unit) < 0)
+ goto out_sock_release_nosk;
+
+ sk = sock->sk;
+ sk_change_net(sk, net);
+
+ if (!cfg || cfg->groups < 32)
+ groups = 32;
+ else
+ groups = cfg->groups;
+
+ listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL);
+ if (!listeners)
+ goto out_sock_release;
+
+ sk->sk_data_ready = netlink_data_ready;
+ if (cfg && cfg->input)
+ nlk_sk(sk)->netlink_rcv = cfg->input;
+
+ if (netlink_insert(sk, 0))
+ goto out_sock_release;
+
+ nlk = nlk_sk(sk);
+ nlk->flags |= NETLINK_KERNEL_SOCKET;
+
+ netlink_table_grab();
+ if (!nl_table[unit].registered) {
+ nl_table[unit].groups = groups;
+ rcu_assign_pointer(nl_table[unit].listeners, listeners);
+ nl_table[unit].cb_mutex = cb_mutex;
+ nl_table[unit].module = module;
+ if (cfg) {
+ nl_table[unit].bind = cfg->bind;
+ nl_table[unit].unbind = cfg->unbind;
+ nl_table[unit].flags = cfg->flags;
+ if (cfg->compare)
+ nl_table[unit].compare = cfg->compare;
+ }
+ nl_table[unit].registered = 1;
+ } else {
+ kfree(listeners);
+ nl_table[unit].registered++;
+ }
+ netlink_table_ungrab();
+ return sk;
+
+out_sock_release:
+ kfree(listeners);
+ netlink_kernel_release(sk);
+ return NULL;
+
+out_sock_release_nosk:
+ sock_release(sock);
+ return NULL;
+}
+EXPORT_SYMBOL(__netlink_kernel_create);
+
+void
+netlink_kernel_release(struct sock *sk)
+{
+ sk_release_kernel(sk);
+}
+EXPORT_SYMBOL(netlink_kernel_release);
+
+int __netlink_change_ngroups(struct sock *sk, unsigned int groups)
+{
+ struct listeners *new, *old;
+ struct netlink_table *tbl = &nl_table[sk->sk_protocol];
+
+ if (groups < 32)
+ groups = 32;
+
+ if (NLGRPSZ(tbl->groups) < NLGRPSZ(groups)) {
+ new = kzalloc(sizeof(*new) + NLGRPSZ(groups), GFP_ATOMIC);
+ if (!new)
+ return -ENOMEM;
+ old = nl_deref_protected(tbl->listeners);
+ memcpy(new->masks, old->masks, NLGRPSZ(tbl->groups));
+ rcu_assign_pointer(tbl->listeners, new);
+
+ kfree_rcu(old, rcu);
+ }
+ tbl->groups = groups;
+
+ return 0;
+}
+
+/**
+ * netlink_change_ngroups - change number of multicast groups
+ *
+ * This changes the number of multicast groups that are available
+ * on a certain netlink family. Note that it is not possible to
+ * change the number of groups to below 32. Also note that it does
+ * not implicitly call netlink_clear_multicast_users() when the
+ * number of groups is reduced.
+ *
+ * @sk: The kernel netlink socket, as returned by netlink_kernel_create().
+ * @groups: The new number of groups.
+ */
+int netlink_change_ngroups(struct sock *sk, unsigned int groups)
+{
+ int err;
+
+ netlink_table_grab();
+ err = __netlink_change_ngroups(sk, groups);
+ netlink_table_ungrab();
+
+ return err;
+}
+
+void __netlink_clear_multicast_users(struct sock *ksk, unsigned int group)
+{
+ struct sock *sk;
+ struct netlink_table *tbl = &nl_table[ksk->sk_protocol];
+
+ sk_for_each_bound(sk, &tbl->mc_list)
+ netlink_update_socket_mc(nlk_sk(sk), group, 0);
+}
+
+struct nlmsghdr *
+__nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags)
+{
+ struct nlmsghdr *nlh;
+ int size = nlmsg_msg_size(len);
+
+ nlh = (struct nlmsghdr *)skb_put(skb, NLMSG_ALIGN(size));
+ nlh->nlmsg_type = type;
+ nlh->nlmsg_len = size;
+ nlh->nlmsg_flags = flags;
+ nlh->nlmsg_pid = portid;
+ nlh->nlmsg_seq = seq;
+ if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0)
+ memset(nlmsg_data(nlh) + len, 0, NLMSG_ALIGN(size) - size);
+ return nlh;
+}
+EXPORT_SYMBOL(__nlmsg_put);
+
+/*
+ * It looks a bit ugly.
+ * It would be better to create kernel thread.
+ */
+
+static int netlink_dump(struct sock *sk)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+ struct netlink_callback *cb;
+ struct sk_buff *skb = NULL;
+ struct nlmsghdr *nlh;
+ int len, err = -ENOBUFS;
+ int alloc_size;
+
+ mutex_lock(nlk->cb_mutex);
+ if (!nlk->cb_running) {
+ err = -EINVAL;
+ goto errout_skb;
+ }
+
+ cb = &nlk->cb;
+ alloc_size = max_t(int, cb->min_dump_alloc, NLMSG_GOODSIZE);
+
+ if (!netlink_rx_is_mmaped(sk) &&
+ atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
+ goto errout_skb;
+
+ /* NLMSG_GOODSIZE is small to avoid high order allocations being
+ * required, but it makes sense to _attempt_ a 16K bytes allocation
+ * to reduce number of system calls on dump operations, if user
+ * ever provided a big enough buffer.
+ */
+ if (alloc_size < nlk->max_recvmsg_len) {
+ skb = netlink_alloc_skb(sk,
+ nlk->max_recvmsg_len,
+ nlk->portid,
+ GFP_KERNEL |
+ __GFP_NOWARN |
+ __GFP_NORETRY);
+ /* available room should be exact amount to avoid MSG_TRUNC */
+ if (skb)
+ skb_reserve(skb, skb_tailroom(skb) -
+ nlk->max_recvmsg_len);
+ }
+ if (!skb)
+ skb = netlink_alloc_skb(sk, alloc_size, nlk->portid,
+ GFP_KERNEL);
+ if (!skb)
+ goto errout_skb;
+ netlink_skb_set_owner_r(skb, sk);
+
+ len = cb->dump(skb, cb);
+
+ if (len > 0) {
+ mutex_unlock(nlk->cb_mutex);
+
+ if (sk_filter(sk, skb))
+ kfree_skb(skb);
+ else
+ __netlink_sendskb(sk, skb);
+ return 0;
+ }
+
+ nlh = nlmsg_put_answer(skb, cb, NLMSG_DONE, sizeof(len), NLM_F_MULTI);
+ if (!nlh)
+ goto errout_skb;
+
+ nl_dump_check_consistent(cb, nlh);
+
+ memcpy(nlmsg_data(nlh), &len, sizeof(len));
+
+ if (sk_filter(sk, skb))
+ kfree_skb(skb);
+ else
+ __netlink_sendskb(sk, skb);
+
+ if (cb->done)
+ cb->done(cb);
+
+ nlk->cb_running = false;
+ mutex_unlock(nlk->cb_mutex);
+ module_put(cb->module);
+ consume_skb(cb->skb);
+ return 0;
+
+errout_skb:
+ mutex_unlock(nlk->cb_mutex);
+ kfree_skb(skb);
+ return err;
+}
+
+int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ struct netlink_dump_control *control)
+{
+ struct netlink_callback *cb;
+ struct sock *sk;
+ struct netlink_sock *nlk;
+ int ret;
+
+ /* Memory mapped dump requests need to be copied to avoid looping
+ * on the pending state in netlink_mmap_sendmsg() while the CB hold
+ * a reference to the skb.
+ */
+ if (netlink_skb_is_mmaped(skb)) {
+ skb = skb_copy(skb, GFP_KERNEL);
+ if (skb == NULL)
+ return -ENOBUFS;
+ } else
+ atomic_inc(&skb->users);
+
+ sk = netlink_lookup(sock_net(ssk), ssk->sk_protocol, NETLINK_CB(skb).portid);
+ if (sk == NULL) {
+ ret = -ECONNREFUSED;
+ goto error_free;
+ }
+
+ nlk = nlk_sk(sk);
+ mutex_lock(nlk->cb_mutex);
+ /* A dump is in progress... */
+ if (nlk->cb_running) {
+ ret = -EBUSY;
+ goto error_unlock;
+ }
+ /* add reference of module which cb->dump belongs to */
+ if (!try_module_get(control->module)) {
+ ret = -EPROTONOSUPPORT;
+ goto error_unlock;
+ }
+
+ cb = &nlk->cb;
+ memset(cb, 0, sizeof(*cb));
+ cb->dump = control->dump;
+ cb->done = control->done;
+ cb->nlh = nlh;
+ cb->data = control->data;
+ cb->module = control->module;
+ cb->min_dump_alloc = control->min_dump_alloc;
+ cb->skb = skb;
+
+ nlk->cb_running = true;
+
+ mutex_unlock(nlk->cb_mutex);
+
+ ret = netlink_dump(sk);
+ sock_put(sk);
+
+ if (ret)
+ return ret;
+
+ /* We successfully started a dump, by returning -EINTR we
+ * signal not to send ACK even if it was requested.
+ */
+ return -EINTR;
+
+error_unlock:
+ sock_put(sk);
+ mutex_unlock(nlk->cb_mutex);
+error_free:
+ kfree_skb(skb);
+ return ret;
+}
+EXPORT_SYMBOL(__netlink_dump_start);
+
+void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
+{
+ struct sk_buff *skb;
+ struct nlmsghdr *rep;
+ struct nlmsgerr *errmsg;
+ size_t payload = sizeof(*errmsg);
+
+ /* error messages get the original request appened */
+ if (err)
+ payload += nlmsg_len(nlh);
+
+ skb = netlink_alloc_skb(in_skb->sk, nlmsg_total_size(payload),
+ NETLINK_CB(in_skb).portid, GFP_KERNEL);
+ if (!skb) {
+ struct sock *sk;
+
+ sk = netlink_lookup(sock_net(in_skb->sk),
+ in_skb->sk->sk_protocol,
+ NETLINK_CB(in_skb).portid);
+ if (sk) {
+ sk->sk_err = ENOBUFS;
+ sk->sk_error_report(sk);
+ sock_put(sk);
+ }
+ return;
+ }
+
+ rep = __nlmsg_put(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
+ NLMSG_ERROR, payload, 0);
+ errmsg = nlmsg_data(rep);
+ errmsg->error = err;
+ memcpy(&errmsg->msg, nlh, err ? nlh->nlmsg_len : sizeof(*nlh));
+ netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).portid, MSG_DONTWAIT);
+}
+EXPORT_SYMBOL(netlink_ack);
+
+int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
+ struct nlmsghdr *))
+{
+ struct nlmsghdr *nlh;
+ int err;
+
+ while (skb->len >= nlmsg_total_size(0)) {
+ int msglen;
+
+ nlh = nlmsg_hdr(skb);
+ err = 0;
+
+ if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len)
+ return 0;
+
+ /* Only requests are handled by the kernel */
+ if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
+ goto ack;
+
+ /* Skip control messages */
+ if (nlh->nlmsg_type < NLMSG_MIN_TYPE)
+ goto ack;
+
+ err = cb(skb, nlh);
+ if (err == -EINTR)
+ goto skip;
+
+ack:
+ if (nlh->nlmsg_flags & NLM_F_ACK || err)
+ netlink_ack(skb, nlh, err);
+
+skip:
+ msglen = NLMSG_ALIGN(nlh->nlmsg_len);
+ if (msglen > skb->len)
+ msglen = skb->len;
+ skb_pull(skb, msglen);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(netlink_rcv_skb);
+
+/**
+ * nlmsg_notify - send a notification netlink message
+ * @sk: netlink socket to use
+ * @skb: notification message
+ * @portid: destination netlink portid for reports or 0
+ * @group: destination multicast group or 0
+ * @report: 1 to report back, 0 to disable
+ * @flags: allocation flags
+ */
+int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid,
+ unsigned int group, int report, gfp_t flags)
+{
+ int err = 0;
+
+ if (group) {
+ int exclude_portid = 0;
+
+ if (report) {
+ atomic_inc(&skb->users);
+ exclude_portid = portid;
+ }
+
+ /* errors reported via destination sk->sk_err, but propagate
+ * delivery errors if NETLINK_BROADCAST_ERROR flag is set */
+ err = nlmsg_multicast(sk, skb, exclude_portid, group, flags);
+ }
+
+ if (report) {
+ int err2;
+
+ err2 = nlmsg_unicast(sk, skb, portid);
+ if (!err || err == -ESRCH)
+ err = err2;
+ }
+
+ return err;
+}
+EXPORT_SYMBOL(nlmsg_notify);
+
+#ifdef CONFIG_PROC_FS
+struct nl_seq_iter {
+ struct seq_net_private p;
+ struct rhashtable_iter hti;
+ int link;
+};
+
+static int netlink_walk_start(struct nl_seq_iter *iter)
+{
+ int err;
+
+ err = rhashtable_walk_init(&nl_table[iter->link].hash, &iter->hti);
+ if (err) {
+ iter->link = MAX_LINKS;
+ return err;
+ }
+
+ err = rhashtable_walk_start(&iter->hti);
+ return err == -EAGAIN ? 0 : err;
+}
+
+static void netlink_walk_stop(struct nl_seq_iter *iter)
+{
+ rhashtable_walk_stop(&iter->hti);
+ rhashtable_walk_exit(&iter->hti);
+}
+
+static void *__netlink_seq_next(struct seq_file *seq)
+{
+ struct nl_seq_iter *iter = seq->private;
+ struct netlink_sock *nlk;
+
+ do {
+ for (;;) {
+ int err;
+
+ nlk = rhashtable_walk_next(&iter->hti);
+
+ if (IS_ERR(nlk)) {
+ if (PTR_ERR(nlk) == -EAGAIN)
+ continue;
+
+ return nlk;
+ }
+
+ if (nlk)
+ break;
+
+ netlink_walk_stop(iter);
+ if (++iter->link >= MAX_LINKS)
+ return NULL;
+
+ err = netlink_walk_start(iter);
+ if (err)
+ return ERR_PTR(err);
+ }
+ } while (sock_net(&nlk->sk) != seq_file_net(seq));
+
+ return nlk;
+}
+
+static void *netlink_seq_start(struct seq_file *seq, loff_t *posp)
+{
+ struct nl_seq_iter *iter = seq->private;
+ void *obj = SEQ_START_TOKEN;
+ loff_t pos;
+ int err;
+
+ iter->link = 0;
+
+ err = netlink_walk_start(iter);
+ if (err)
+ return ERR_PTR(err);
+
+ for (pos = *posp; pos && obj && !IS_ERR(obj); pos--)
+ obj = __netlink_seq_next(seq);
+
+ return obj;
+}
+
+static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ ++*pos;
+ return __netlink_seq_next(seq);
+}
+
+static void netlink_seq_stop(struct seq_file *seq, void *v)
+{
+ struct nl_seq_iter *iter = seq->private;
+
+ if (iter->link >= MAX_LINKS)
+ return;
+
+ netlink_walk_stop(iter);
+}
+
+
+static int netlink_seq_show(struct seq_file *seq, void *v)
+{
+ if (v == SEQ_START_TOKEN) {
+ seq_puts(seq,
+ "sk Eth Pid Groups "
+ "Rmem Wmem Dump Locks Drops Inode\n");
+ } else {
+ struct sock *s = v;
+ struct netlink_sock *nlk = nlk_sk(s);
+
+ seq_printf(seq, "%pK %-3d %-6u %08x %-8d %-8d %d %-8d %-8d %-8lu\n",
+ s,
+ s->sk_protocol,
+ nlk->portid,
+ nlk->groups ? (u32)nlk->groups[0] : 0,
+ sk_rmem_alloc_get(s),
+ sk_wmem_alloc_get(s),
+ nlk->cb_running,
+ atomic_read(&s->sk_refcnt),
+ atomic_read(&s->sk_drops),
+ sock_i_ino(s)
+ );
+
+ }
+ return 0;
+}
+
+static const struct seq_operations netlink_seq_ops = {
+ .start = netlink_seq_start,
+ .next = netlink_seq_next,
+ .stop = netlink_seq_stop,
+ .show = netlink_seq_show,
+};
+
+
+static int netlink_seq_open(struct inode *inode, struct file *file)
+{
+ return seq_open_net(inode, file, &netlink_seq_ops,
+ sizeof(struct nl_seq_iter));
+}
+
+static const struct file_operations netlink_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = netlink_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_net,
+};
+
+#endif
+
+int netlink_register_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_register(&netlink_chain, nb);
+}
+EXPORT_SYMBOL(netlink_register_notifier);
+
+int netlink_unregister_notifier(struct notifier_block *nb)
+{
+ return atomic_notifier_chain_unregister(&netlink_chain, nb);
+}
+EXPORT_SYMBOL(netlink_unregister_notifier);
+
+static const struct proto_ops netlink_ops = {
+ .family = PF_NETLINK,
+ .owner = THIS_MODULE,
+ .release = netlink_release,
+ .bind = netlink_bind,
+ .connect = netlink_connect,
+ .socketpair = sock_no_socketpair,
+ .accept = sock_no_accept,
+ .getname = netlink_getname,
+ .poll = netlink_poll,
+ .ioctl = sock_no_ioctl,
+ .listen = sock_no_listen,
+ .shutdown = sock_no_shutdown,
+ .setsockopt = netlink_setsockopt,
+ .getsockopt = netlink_getsockopt,
+ .sendmsg = netlink_sendmsg,
+ .recvmsg = netlink_recvmsg,
+ .mmap = netlink_mmap,
+ .sendpage = sock_no_sendpage,
+};
+
+static const struct net_proto_family netlink_family_ops = {
+ .family = PF_NETLINK,
+ .create = netlink_create,
+ .owner = THIS_MODULE, /* for consistency 8) */
+};
+
+static int __net_init netlink_net_init(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+ if (!proc_create("netlink", 0, net->proc_net, &netlink_seq_fops))
+ return -ENOMEM;
+#endif
+ return 0;
+}
+
+static void __net_exit netlink_net_exit(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+ remove_proc_entry("netlink", net->proc_net);
+#endif
+}
+
+static void __init netlink_add_usersock_entry(void)
+{
+ struct listeners *listeners;
+ int groups = 32;
+
+ listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL);
+ if (!listeners)
+ panic("netlink_add_usersock_entry: Cannot allocate listeners\n");
+
+ netlink_table_grab();
+
+ nl_table[NETLINK_USERSOCK].groups = groups;
+ rcu_assign_pointer(nl_table[NETLINK_USERSOCK].listeners, listeners);
+ nl_table[NETLINK_USERSOCK].module = THIS_MODULE;
+ nl_table[NETLINK_USERSOCK].registered = 1;
+ nl_table[NETLINK_USERSOCK].flags = NL_CFG_F_NONROOT_SEND;
+
+ netlink_table_ungrab();
+}
+
+static struct pernet_operations __net_initdata netlink_net_ops = {
+ .init = netlink_net_init,
+ .exit = netlink_net_exit,
+};
+
+static inline u32 netlink_hash(const void *data, u32 len, u32 seed)
+{
+ const struct netlink_sock *nlk = data;
+ struct netlink_compare_arg arg;
+
+ netlink_compare_arg_init(&arg, sock_net(&nlk->sk), nlk->portid);
+ return jhash2((u32 *)&arg, netlink_compare_arg_len / sizeof(u32), seed);
+}
+
+static const struct rhashtable_params netlink_rhashtable_params = {
+ .head_offset = offsetof(struct netlink_sock, node),
+ .key_len = netlink_compare_arg_len,
+ .obj_hashfn = netlink_hash,
+ .obj_cmpfn = netlink_compare,
+ .automatic_shrinking = true,
+};
+
+static int __init netlink_proto_init(void)
+{
+ int i;
+ int err = proto_register(&netlink_proto, 0);
+
+ if (err != 0)
+ goto out;
+
+ BUILD_BUG_ON(sizeof(struct netlink_skb_parms) > FIELD_SIZEOF(struct sk_buff, cb));
+
+ nl_table = kcalloc(MAX_LINKS, sizeof(*nl_table), GFP_KERNEL);
+ if (!nl_table)
+ goto panic;
+
+ for (i = 0; i < MAX_LINKS; i++) {
+ if (rhashtable_init(&nl_table[i].hash,
+ &netlink_rhashtable_params) < 0) {
+ while (--i > 0)
+ rhashtable_destroy(&nl_table[i].hash);
+ kfree(nl_table);
+ goto panic;
+ }
+ }
+
+ INIT_LIST_HEAD(&netlink_tap_all);
+
+ netlink_add_usersock_entry();
+
+ sock_register(&netlink_family_ops);
+ register_pernet_subsys(&netlink_net_ops);
+ /* The netlink device handler may be needed early. */
+ rtnetlink_init();
+out:
+ return err;
+panic:
+ panic("netlink_init: Cannot allocate nl_table\n");
+}
+
+core_initcall(netlink_proto_init);
Code Review / kvmfornfv.git / blobdiff