Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /* Copyright (C) 2007-2020  B.A.T.M.A.N. contributors:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Marek Lindner
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) #include "icmp_socket.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include "main.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/atomic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/compiler.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/debugfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/etherdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/eventpoll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/export.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/fs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/gfp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <linux/if_ether.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/netdevice.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/pkt_sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/poll.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/printk.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/sched.h> /* for linux/wait.h */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <linux/spinlock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <linux/stddef.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include <linux/uaccess.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include <linux/wait.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #include <uapi/linux/batadv_packet.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) #include "debugfs.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #include "hard-interface.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #include "log.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #include "originator.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) #include "send.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) static struct batadv_socket_client *batadv_socket_client_hash[256];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) static void batadv_socket_add_packet(struct batadv_socket_client *socket_client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 				     struct batadv_icmp_header *icmph,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 				     size_t icmp_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51)  * batadv_socket_init() - Initialize soft interface independent socket data
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) void batadv_socket_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	memset(batadv_socket_client_hash, 0, sizeof(batadv_socket_client_hash));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) static int batadv_socket_open(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	struct batadv_socket_client *socket_client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	if (!try_module_get(THIS_MODULE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		return -EBUSY;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	batadv_debugfs_deprecated(file, "");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	stream_open(inode, file);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	socket_client = kmalloc(sizeof(*socket_client), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	if (!socket_client) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 		module_put(THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	for (i = 0; i < ARRAY_SIZE(batadv_socket_client_hash); i++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		if (!batadv_socket_client_hash[i]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 			batadv_socket_client_hash[i] = socket_client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	if (i == ARRAY_SIZE(batadv_socket_client_hash)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		pr_err("Error - can't add another packet client: maximum number of clients reached\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		kfree(socket_client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		module_put(THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		return -EXFULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	INIT_LIST_HEAD(&socket_client->queue_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	socket_client->queue_len = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	socket_client->index = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	socket_client->bat_priv = inode->i_private;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	spin_lock_init(&socket_client->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	init_waitqueue_head(&socket_client->queue_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	file->private_data = socket_client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static int batadv_socket_release(struct inode *inode, struct file *file)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	struct batadv_socket_client *client = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	struct batadv_socket_packet *packet, *tmp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	spin_lock_bh(&client->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	/* for all packets in the queue ... */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	list_for_each_entry_safe(packet, tmp, &client->queue_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		list_del(&packet->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 		kfree(packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	batadv_socket_client_hash[client->index] = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	spin_unlock_bh(&client->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	kfree(client);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	module_put(THIS_MODULE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static ssize_t batadv_socket_read(struct file *file, char __user *buf,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 				  size_t count, loff_t *ppos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	struct batadv_socket_client *socket_client = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	struct batadv_socket_packet *socket_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	size_t packet_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	int error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 	if ((file->f_flags & O_NONBLOCK) && socket_client->queue_len == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 		return -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	if (!buf || count < sizeof(struct batadv_icmp_packet))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	error = wait_event_interruptible(socket_client->queue_wait,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 					 socket_client->queue_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 		return error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	spin_lock_bh(&socket_client->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	socket_packet = list_first_entry(&socket_client->queue_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 					 struct batadv_socket_packet, list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	list_del(&socket_packet->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	socket_client->queue_len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	spin_unlock_bh(&socket_client->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	packet_len = min(count, socket_packet->icmp_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	error = copy_to_user(buf, &socket_packet->icmp_packet, packet_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	kfree(socket_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	if (error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	return packet_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 				   size_t len, loff_t *off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	struct batadv_socket_client *socket_client = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	struct batadv_priv *bat_priv = socket_client->bat_priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	struct batadv_hard_iface *primary_if = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	struct batadv_icmp_packet_rr *icmp_packet_rr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	struct batadv_icmp_header *icmp_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	struct batadv_orig_node *orig_node = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	struct batadv_neigh_node *neigh_node = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	size_t packet_len = sizeof(struct batadv_icmp_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	u8 *addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	if (len < sizeof(struct batadv_icmp_header)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 			   "Error - can't send packet from char device: invalid packet size\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	primary_if = batadv_primary_if_get_selected(bat_priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	if (!primary_if) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 		len = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	if (len >= BATADV_ICMP_MAX_PACKET_SIZE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		packet_len = BATADV_ICMP_MAX_PACKET_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		packet_len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	skb = netdev_alloc_skb_ip_align(NULL, packet_len + ETH_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	if (!skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 		len = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	skb->priority = TC_PRIO_CONTROL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	skb_reserve(skb, ETH_HLEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	icmp_header = skb_put(skb, packet_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 	if (copy_from_user(icmp_header, buff, packet_len)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		len = -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 		goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	if (icmp_header->packet_type != BATADV_ICMP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 			   "Error - can't send packet from char device: got bogus packet type (expected: BAT_ICMP)\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		len = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 		goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	switch (icmp_header->msg_type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	case BATADV_ECHO_REQUEST:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 		if (len < sizeof(struct batadv_icmp_packet)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 			batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 				   "Error - can't send packet from char device: invalid packet size\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 			len = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 			goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		if (atomic_read(&bat_priv->mesh_state) != BATADV_MESH_ACTIVE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 			goto dst_unreach;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		orig_node = batadv_orig_hash_find(bat_priv, icmp_header->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 		if (!orig_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 			goto dst_unreach;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 		neigh_node = batadv_orig_router_get(orig_node,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 						    BATADV_IF_DEFAULT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		if (!neigh_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 			goto dst_unreach;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		if (!neigh_node->if_incoming)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			goto dst_unreach;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		if (neigh_node->if_incoming->if_status != BATADV_IF_ACTIVE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 			goto dst_unreach;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 		icmp_packet_rr = (struct batadv_icmp_packet_rr *)icmp_header;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		if (packet_len == sizeof(*icmp_packet_rr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 			addr = neigh_node->if_incoming->net_dev->dev_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 			ether_addr_copy(icmp_packet_rr->rr[0], addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 			   "Error - can't send packet from char device: got unknown message type\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		len = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 		goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	icmp_header->uid = socket_client->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	if (icmp_header->version != BATADV_COMPAT_VERSION) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		icmp_header->msg_type = BATADV_PARAMETER_PROBLEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		icmp_header->version = BATADV_COMPAT_VERSION;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		batadv_socket_add_packet(socket_client, icmp_header,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 					 packet_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 		goto free_skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	ether_addr_copy(icmp_header->orig, primary_if->net_dev->dev_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	batadv_send_unicast_skb(skb, neigh_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) dst_unreach:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	icmp_header->msg_type = BATADV_DESTINATION_UNREACHABLE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	batadv_socket_add_packet(socket_client, icmp_header, packet_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) free_skb:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	if (primary_if)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		batadv_hardif_put(primary_if);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	if (neigh_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		batadv_neigh_node_put(neigh_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	if (orig_node)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 		batadv_orig_node_put(orig_node);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	return len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) static __poll_t batadv_socket_poll(struct file *file, poll_table *wait)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 	struct batadv_socket_client *socket_client = file->private_data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	poll_wait(file, &socket_client->queue_wait, wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	if (socket_client->queue_len > 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		return EPOLLIN | EPOLLRDNORM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) static const struct file_operations batadv_fops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	.owner = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	.open = batadv_socket_open,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	.release = batadv_socket_release,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	.read = batadv_socket_read,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	.write = batadv_socket_write,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 	.poll = batadv_socket_poll,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	.llseek = no_llseek,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312)  * batadv_socket_setup() - Create debugfs "socket" file
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)  * @bat_priv: the bat priv with all the soft interface information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) void batadv_socket_setup(struct batadv_priv *bat_priv)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	debugfs_create_file(BATADV_ICMP_SOCKET, 0600, bat_priv->debug_dir,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 			    bat_priv, &batadv_fops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322)  * batadv_socket_add_packet() - schedule an icmp packet to be sent to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323)  *  userspace on an icmp socket.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324)  * @socket_client: the socket this packet belongs to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325)  * @icmph: pointer to the header of the icmp packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)  * @icmp_len: total length of the icmp packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) static void batadv_socket_add_packet(struct batadv_socket_client *socket_client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) 				     struct batadv_icmp_header *icmph,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 				     size_t icmp_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	struct batadv_socket_packet *socket_packet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 	size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	socket_packet = kmalloc(sizeof(*socket_packet), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	if (!socket_packet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	len = icmp_len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 	/* check the maximum length before filling the buffer */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 	if (len > sizeof(socket_packet->icmp_packet))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 		len = sizeof(socket_packet->icmp_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	INIT_LIST_HEAD(&socket_packet->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	memcpy(&socket_packet->icmp_packet, icmph, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	socket_packet->icmp_len = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	spin_lock_bh(&socket_client->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	/* while waiting for the lock the socket_client could have been
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 	 * deleted
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	if (!batadv_socket_client_hash[icmph->uid]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 		spin_unlock_bh(&socket_client->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 		kfree(socket_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	list_add_tail(&socket_packet->list, &socket_client->queue_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	socket_client->queue_len++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 	if (socket_client->queue_len > 100) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 		socket_packet = list_first_entry(&socket_client->queue_list,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 						 struct batadv_socket_packet,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 						 list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 		list_del(&socket_packet->list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		kfree(socket_packet);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 		socket_client->queue_len--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	spin_unlock_bh(&socket_client->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 	wake_up(&socket_client->queue_wait);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379)  * batadv_socket_receive_packet() - schedule an icmp packet to be received
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)  *  locally and sent to userspace.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381)  * @icmph: pointer to the header of the icmp packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)  * @icmp_len: total length of the icmp packet
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) void batadv_socket_receive_packet(struct batadv_icmp_header *icmph,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 				  size_t icmp_len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 	struct batadv_socket_client *hash;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	hash = batadv_socket_client_hash[icmph->uid];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	if (hash)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 		batadv_socket_add_packet(hash, icmph, icmp_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) }