summaryrefslogtreecommitdiff
path: root/net/batman-adv/icmp_socket.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/batman-adv/icmp_socket.c')
-rw-r--r--net/batman-adv/icmp_socket.c392
1 files changed, 0 insertions, 392 deletions
diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
deleted file mode 100644
index 8bdabc03b0b2..000000000000
--- a/net/batman-adv/icmp_socket.c
+++ /dev/null
@@ -1,392 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/* Copyright (C) 2007-2020 B.A.T.M.A.N. contributors:
- *
- * Marek Lindner
- */
-
-#include "icmp_socket.h"
-#include "main.h"
-
-#include <linux/atomic.h>
-#include <linux/compiler.h>
-#include <linux/debugfs.h>
-#include <linux/errno.h>
-#include <linux/etherdevice.h>
-#include <linux/eventpoll.h>
-#include <linux/export.h>
-#include <linux/fcntl.h>
-#include <linux/fs.h>
-#include <linux/gfp.h>
-#include <linux/if_ether.h>
-#include <linux/kernel.h>
-#include <linux/list.h>
-#include <linux/module.h>
-#include <linux/netdevice.h>
-#include <linux/pkt_sched.h>
-#include <linux/poll.h>
-#include <linux/printk.h>
-#include <linux/sched.h> /* for linux/wait.h */
-#include <linux/skbuff.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
-#include <linux/stddef.h>
-#include <linux/string.h>
-#include <linux/uaccess.h>
-#include <linux/wait.h>
-#include <uapi/linux/batadv_packet.h>
-
-#include "debugfs.h"
-#include "hard-interface.h"
-#include "log.h"
-#include "originator.h"
-#include "send.h"
-
-static struct batadv_socket_client *batadv_socket_client_hash[256];
-
-static void batadv_socket_add_packet(struct batadv_socket_client *socket_client,
- struct batadv_icmp_header *icmph,
- size_t icmp_len);
-
-/**
- * batadv_socket_init() - Initialize soft interface independent socket data
- */
-void batadv_socket_init(void)
-{
- memset(batadv_socket_client_hash, 0, sizeof(batadv_socket_client_hash));
-}
-
-static int batadv_socket_open(struct inode *inode, struct file *file)
-{
- unsigned int i;
- struct batadv_socket_client *socket_client;
-
- if (!try_module_get(THIS_MODULE))
- return -EBUSY;
-
- batadv_debugfs_deprecated(file, "");
-
- stream_open(inode, file);
-
- socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL);
- if (!socket_client) {
- module_put(THIS_MODULE);
- return -ENOMEM;
- }
-
- for (i = 0; i < ARRAY_SIZE(batadv_socket_client_hash); i++) {
- if (!batadv_socket_client_hash[i]) {
- batadv_socket_client_hash[i] = socket_client;
- break;
- }
- }
-
- if (i == ARRAY_SIZE(batadv_socket_client_hash)) {
- pr_err("Error - can't add another packet client: maximum number of clients reached\n");
- kfree(socket_client);
- module_put(THIS_MODULE);
- return -EXFULL;
- }
-
- INIT_LIST_HEAD(&socket_client->queue_list);
- socket_client->queue_len = 0;
- socket_client->index = i;
- socket_client->bat_priv = inode->i_private;
- spin_lock_init(&socket_client->lock);
- init_waitqueue_head(&socket_client->queue_wait);
-
- file->private_data = socket_client;
-
- return 0;
-}
-
-static int batadv_socket_release(struct inode *inode, struct file *file)
-{
- struct batadv_socket_client *client = file->private_data;
- struct batadv_socket_packet *packet, *tmp;
-
- spin_lock_bh(&client->lock);
-
- /* for all packets in the queue ... */
- list_for_each_entry_safe(packet, tmp, &client->queue_list, list) {
- list_del(&packet->list);
- kfree(packet);
- }
-
- batadv_socket_client_hash[client->index] = NULL;
- spin_unlock_bh(&client->lock);
-
- kfree(client);
- module_put(THIS_MODULE);
-
- return 0;
-}
-
-static ssize_t batadv_socket_read(struct file *file, char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct batadv_socket_client *socket_client = file->private_data;
- struct batadv_socket_packet *socket_packet;
- size_t packet_len;
- int error;
-
- if ((file->f_flags & O_NONBLOCK) && socket_client->queue_len == 0)
- return -EAGAIN;
-
- if (!buf || count < sizeof(struct batadv_icmp_packet))
- return -EINVAL;
-
- error = wait_event_interruptible(socket_client->queue_wait,
- socket_client->queue_len);
-
- if (error)
- return error;
-
- spin_lock_bh(&socket_client->lock);
-
- socket_packet = list_first_entry(&socket_client->queue_list,
- struct batadv_socket_packet, list);
- list_del(&socket_packet->list);
- socket_client->queue_len--;
-
- spin_unlock_bh(&socket_client->lock);
-
- packet_len = min(count, socket_packet->icmp_len);
- error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len);
-
- kfree(socket_packet);
-
- if (error)
- return -EFAULT;
-
- return packet_len;
-}
-
-static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
- size_t len, loff_t *off)
-{
- struct batadv_socket_client *socket_client = file->private_data;
- struct batadv_priv *bat_priv = socket_client->bat_priv;
- struct batadv_hard_iface *primary_if = NULL;
- struct sk_buff *skb;
- struct batadv_icmp_packet_rr *icmp_packet_rr;
- struct batadv_icmp_header *icmp_header;
- struct batadv_orig_node *orig_node = NULL;
- struct batadv_neigh_node *neigh_node = NULL;
- size_t packet_len = sizeof(struct batadv_icmp_packet);
- u8 *addr;
-
- if (len < sizeof(struct batadv_icmp_header)) {
- batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
- "Error - can't send packet from char device: invalid packet size\n");
- return -EINVAL;
- }
-
- primary_if = batadv_primary_if_get_selected(bat_priv);
-
- if (!primary_if) {
- len = -EFAULT;
- goto out;
- }
-
- if (len >= BATADV_ICMP_MAX_PACKET_SIZE)
- packet_len = BATADV_ICMP_MAX_PACKET_SIZE;
- else
- packet_len = len;
-
- skb = netdev_alloc_skb_ip_align(NULL, packet_len + ETH_HLEN);
- if (!skb) {
- len = -ENOMEM;
- goto out;
- }
-
- skb->priority = TC_PRIO_CONTROL;
- skb_reserve(skb, ETH_HLEN);
- icmp_header = skb_put(skb, packet_len);
-
- if (copy_from_user(icmp_header, buff, packet_len)) {
- len = -EFAULT;
- goto free_skb;
- }
-
- if (icmp_header->packet_type != BATADV_ICMP) {
- batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
- "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n");
- len = -EINVAL;
- goto free_skb;
- }
-
- switch (icmp_header->msg_type) {
- case BATADV_ECHO_REQUEST:
- if (len < sizeof(struct batadv_icmp_packet)) {
- batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
- "Error - can't send packet from char device: invalid packet size\n");
- len = -EINVAL;
- goto free_skb;
- }
-
- if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
- goto dst_unreach;
-
- orig_node = batadv_orig_hash_find(bat_priv, icmp_header->dst);
- if (!orig_node)
- goto dst_unreach;
-
- neigh_node = batadv_orig_router_get(orig_node,
- BATADV_IF_DEFAULT);
- if (!neigh_node)
- goto dst_unreach;
-
- if (!neigh_node->if_incoming)
- goto dst_unreach;
-
- if (neigh_node->if_incoming->if_status != BATADV_IF_ACTIVE)
- goto dst_unreach;
-
- icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmp_header;
- if (packet_len == sizeof(*icmp_packet_rr)) {
- addr = neigh_node->if_incoming->net_dev->dev_addr;
- ether_addr_copy(icmp_packet_rr->rr[0], addr);
- }
-
- break;
- default:
- batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
- "Error - can't send packet from char device: got unknown message type\n");
- len = -EINVAL;
- goto free_skb;
- }
-
- icmp_header->uid = socket_client->index;
-
- if (icmp_header->version != BATADV_COMPAT_VERSION) {
- icmp_header->msg_type = BATADV_PARAMETER_PROBLEM;
- icmp_header->version = BATADV_COMPAT_VERSION;
- batadv_socket_add_packet(socket_client, icmp_header,
- packet_len);
- goto free_skb;
- }
-
- ether_addr_copy(icmp_header->orig, primary_if->net_dev->dev_addr);
-
- batadv_send_unicast_skb(skb, neigh_node);
- goto out;
-
-dst_unreach:
- icmp_header->msg_type = BATADV_DESTINATION_UNREACHABLE;
- batadv_socket_add_packet(socket_client, icmp_header, packet_len);
-free_skb:
- kfree_skb(skb);
-out:
- if (primary_if)
- batadv_hardif_put(primary_if);
- if (neigh_node)
- batadv_neigh_node_put(neigh_node);
- if (orig_node)
- batadv_orig_node_put(orig_node);
- return len;
-}
-
-static __poll_t batadv_socket_poll(struct file *file, poll_table *wait)
-{
- struct batadv_socket_client *socket_client = file->private_data;
-
- poll_wait(file, &socket_client->queue_wait, wait);
-
- if (socket_client->queue_len > 0)
- return EPOLLIN | EPOLLRDNORM;
-
- return 0;
-}
-
-static const struct file_operations batadv_fops = {
- .owner = THIS_MODULE,
- .open = batadv_socket_open,
- .release = batadv_socket_release,
- .read = batadv_socket_read,
- .write = batadv_socket_write,
- .poll = batadv_socket_poll,
- .llseek = no_llseek,
-};
-
-/**
- * batadv_socket_setup() - Create debugfs "socket" file
- * @bat_priv: the bat priv with all the soft interface information
- */
-void batadv_socket_setup(struct batadv_priv *bat_priv)
-{
- debugfs_create_file(BATADV_ICMP_SOCKET, 0600, bat_priv->debug_dir,
- bat_priv, &batadv_fops);
-}
-
-/**
- * batadv_socket_add_packet() - schedule an icmp packet to be sent to
- * userspace on an icmp socket.
- * @socket_client: the socket this packet belongs to
- * @icmph: pointer to the header of the icmp packet
- * @icmp_len: total length of the icmp packet
- */
-static void batadv_socket_add_packet(struct batadv_socket_client *socket_client,
- struct batadv_icmp_header *icmph,
- size_t icmp_len)
-{
- struct batadv_socket_packet *socket_packet;
- size_t len;
-
- socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC);
-
- if (!socket_packet)
- return;
-
- len = icmp_len;
- /* check the maximum length before filling the buffer */
- if (len > sizeof(socket_packet->icmp_packet))
- len = sizeof(socket_packet->icmp_packet);
-
- INIT_LIST_HEAD(&socket_packet->list);
- memcpy(&socket_packet->icmp_packet, icmph, len);
- socket_packet->icmp_len = len;
-
- spin_lock_bh(&socket_client->lock);
-
- /* while waiting for the lock the socket_client could have been
- * deleted
- */
- if (!batadv_socket_client_hash[icmph->uid]) {
- spin_unlock_bh(&socket_client->lock);
- kfree(socket_packet);
- return;
- }
-
- list_add_tail(&socket_packet->list, &socket_client->queue_list);
- socket_client->queue_len++;
-
- if (socket_client->queue_len > 100) {
- socket_packet = list_first_entry(&socket_client->queue_list,
- struct batadv_socket_packet,
- list);
-
- list_del(&socket_packet->list);
- kfree(socket_packet);
- socket_client->queue_len--;
- }
-
- spin_unlock_bh(&socket_client->lock);
-
- wake_up(&socket_client->queue_wait);
-}
-
-/**
- * batadv_socket_receive_packet() - schedule an icmp packet to be received
- * locally and sent to userspace.
- * @icmph: pointer to the header of the icmp packet
- * @icmp_len: total length of the icmp packet
- */
-void batadv_socket_receive_packet(struct batadv_icmp_header *icmph,
- size_t icmp_len)
-{
- struct batadv_socket_client *hash;
-
- hash = batadv_socket_client_hash[icmph->uid];
- if (hash)
- batadv_socket_add_packet(hash, icmph, icmp_len);
-}