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path: root/net/batman-adv/icmp_socket.c
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Diffstat (limited to 'net/batman-adv/icmp_socket.c')
-rw-r--r--net/batman-adv/icmp_socket.c128
1 files changed, 80 insertions, 48 deletions
diff --git a/net/batman-adv/icmp_socket.c b/net/batman-adv/icmp_socket.c
index 5a99bb4b6b82..29ae4efe3543 100644
--- a/net/batman-adv/icmp_socket.c
+++ b/net/batman-adv/icmp_socket.c
@@ -29,7 +29,7 @@
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_packet_rr *icmp_packet,
+ struct batadv_icmp_header *icmph,
size_t icmp_len);
void batadv_socket_init(void)
@@ -155,13 +155,13 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
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;
-
+ 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);
- if (len < sizeof(struct batadv_icmp_packet)) {
+ 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;
@@ -174,8 +174,10 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
goto out;
}
- if (len >= sizeof(struct batadv_icmp_packet_rr))
- packet_len = sizeof(struct batadv_icmp_packet_rr);
+ 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) {
@@ -185,67 +187,78 @@ static ssize_t batadv_socket_write(struct file *file, const char __user *buff,
skb->priority = TC_PRIO_CONTROL;
skb_reserve(skb, ETH_HLEN);
- icmp_packet = (struct batadv_icmp_packet_rr *)skb_put(skb, packet_len);
+ icmp_header = (struct batadv_icmp_header *)skb_put(skb, packet_len);
- if (copy_from_user(icmp_packet, buff, packet_len)) {
+ if (copy_from_user(icmp_header, buff, packet_len)) {
len = -EFAULT;
goto free_skb;
}
- if (icmp_packet->header.packet_type != BATADV_ICMP) {
+ if (icmp_header->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;
}
- if (icmp_packet->msg_type != BATADV_ECHO_REQUEST) {
+ 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_node_get_router(orig_node);
+ 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))
+ memcpy(icmp_packet_rr->rr,
+ neigh_node->if_incoming->net_dev->dev_addr,
+ ETH_ALEN);
+
+ break;
+ default:
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
- "Error - can't send packet from char device: got bogus message type (expected: ECHO_REQUEST)\n");
+ "Error - can't send packet from char device: got unknown message type\n");
len = -EINVAL;
goto free_skb;
}
- icmp_packet->uid = socket_client->index;
+ icmp_header->uid = socket_client->index;
- if (icmp_packet->header.version != BATADV_COMPAT_VERSION) {
- icmp_packet->msg_type = BATADV_PARAMETER_PROBLEM;
- icmp_packet->header.version = BATADV_COMPAT_VERSION;
- batadv_socket_add_packet(socket_client, icmp_packet,
+ if (icmp_header->header.version != BATADV_COMPAT_VERSION) {
+ icmp_header->msg_type = BATADV_PARAMETER_PROBLEM;
+ icmp_header->header.version = BATADV_COMPAT_VERSION;
+ batadv_socket_add_packet(socket_client, icmp_header,
packet_len);
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_packet->dst);
- if (!orig_node)
- goto dst_unreach;
-
- neigh_node = batadv_orig_node_get_router(orig_node);
- 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;
-
- memcpy(icmp_packet->orig,
- primary_if->net_dev->dev_addr, ETH_ALEN);
-
- if (packet_len == sizeof(struct batadv_icmp_packet_rr))
- memcpy(icmp_packet->rr,
- neigh_node->if_incoming->net_dev->dev_addr, ETH_ALEN);
+ memcpy(icmp_header->orig, primary_if->net_dev->dev_addr, ETH_ALEN);
batadv_send_skb_packet(skb, neigh_node->if_incoming, neigh_node->addr);
goto out;
dst_unreach:
- icmp_packet->msg_type = BATADV_DESTINATION_UNREACHABLE;
- batadv_socket_add_packet(socket_client, icmp_packet, packet_len);
+ icmp_header->msg_type = BATADV_DESTINATION_UNREACHABLE;
+ batadv_socket_add_packet(socket_client, icmp_header, packet_len);
free_skb:
kfree_skb(skb);
out:
@@ -298,27 +311,40 @@ err:
return -ENOMEM;
}
+/**
+ * batadv_socket_receive_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_packet_rr *icmp_packet,
+ 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, icmp_packet, icmp_len);
- socket_packet->icmp_len = icmp_len;
+ 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[icmp_packet->uid]) {
+ if (!batadv_socket_client_hash[icmph->uid]) {
spin_unlock_bh(&socket_client->lock);
kfree(socket_packet);
return;
@@ -342,12 +368,18 @@ static void batadv_socket_add_packet(struct batadv_socket_client *socket_client,
wake_up(&socket_client->queue_wait);
}
-void batadv_socket_receive_packet(struct batadv_icmp_packet_rr *icmp_packet,
+/**
+ * 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[icmp_packet->uid];
+ hash = batadv_socket_client_hash[icmph->uid];
if (hash)
- batadv_socket_add_packet(hash, icmp_packet, icmp_len);
+ batadv_socket_add_packet(hash, icmph, icmp_len);
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-12 09:09:22 +0000