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VSOCK: Send reset control packet when socket is partially bound 

If a server side socket is bound to an address, but not in the listening
state yet, incoming connection requests should receive a reset control
packet in response. However, the function used to send the reset
silently drops the reset packet if the sending socket isn't bound
to a remote address (as is the case for a bound socket not yet in
the listening state). This change fixes this by using the src
of the incoming packet as destination for the reset packet in
this case.

Fixes: d021c34405 ("VSOCK: Introduce VM Sockets")
Reviewed-by: Adit Ranadive <aditr@vmware.com>
Reviewed-by: Vishnu Dasa <vdasa@vmware.com>
Signed-off-by: Jorgen Hansen <jhansen@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jorgen Hansen 2018-12-18 00:34:06 -08:00 committed by David S. Miller
parent fde9cd69a5
commit a915b982d8
1 changed files with 50 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
net/vmw_vsock/vmci_transport.c
View File

@ -263,6 +263,31 @@ vmci_transport_send_control_pkt_bh(struct sockaddr_vm *src,
false); false);
} }
static int
vmci_transport_alloc_send_control_pkt(struct sockaddr_vm *src,
struct sockaddr_vm *dst,
enum vmci_transport_packet_type type,
u64 size,
u64 mode,
struct vmci_transport_waiting_info *wait,
u16 proto,
struct vmci_handle handle)
{
struct vmci_transport_packet *pkt;
int err;
pkt = kmalloc(sizeof(*pkt), GFP_KERNEL);
if (!pkt)
return -ENOMEM;
err = __vmci_transport_send_control_pkt(pkt, src, dst, type, size,
mode, wait, proto, handle,
true);
kfree(pkt);
return err;
}
static int static int
vmci_transport_send_control_pkt(struct sock *sk, vmci_transport_send_control_pkt(struct sock *sk,
enum vmci_transport_packet_type type, enum vmci_transport_packet_type type,
@ -272,9 +297,7 @@ vmci_transport_send_control_pkt(struct sock *sk,
u16 proto, u16 proto,
struct vmci_handle handle) struct vmci_handle handle)
{ {
struct vmci_transport_packet *pkt;
struct vsock_sock *vsk; struct vsock_sock *vsk;
int err;
vsk = vsock_sk(sk); vsk = vsock_sk(sk);
@ -284,17 +307,10 @@ vmci_transport_send_control_pkt(struct sock *sk,
if (!vsock_addr_bound(&vsk->remote_addr)) if (!vsock_addr_bound(&vsk->remote_addr))
return -EINVAL; return -EINVAL;
pkt = kmalloc(sizeof(*pkt), GFP_KERNEL); return vmci_transport_alloc_send_control_pkt(&vsk->local_addr,
if (!pkt) &vsk->remote_addr,
return -ENOMEM; type, size, mode,
wait, proto, handle);
err = __vmci_transport_send_control_pkt(pkt, &vsk->local_addr,
&vsk->remote_addr, type, size,
mode, wait, proto, handle,
true);
kfree(pkt);
return err;
} }
static int vmci_transport_send_reset_bh(struct sockaddr_vm *dst, static int vmci_transport_send_reset_bh(struct sockaddr_vm *dst,
@ -312,12 +328,29 @@ static int vmci_transport_send_reset_bh(struct sockaddr_vm *dst,
static int vmci_transport_send_reset(struct sock *sk, static int vmci_transport_send_reset(struct sock *sk,
struct vmci_transport_packet *pkt) struct vmci_transport_packet *pkt)
{ {
struct sockaddr_vm *dst_ptr;
struct sockaddr_vm dst;
struct vsock_sock *vsk;
if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST) if (pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST)
return 0; return 0;
return vmci_transport_send_control_pkt(sk,
VMCI_TRANSPORT_PACKET_TYPE_RST, vsk = vsock_sk(sk);
0, 0, NULL, VSOCK_PROTO_INVALID,
VMCI_INVALID_HANDLE); if (!vsock_addr_bound(&vsk->local_addr))
return -EINVAL;
if (vsock_addr_bound(&vsk->remote_addr)) {
dst_ptr = &vsk->remote_addr;
} else {
vsock_addr_init(&dst, pkt->dg.src.context,
pkt->src_port);
dst_ptr = &dst;
}
return vmci_transport_alloc_send_control_pkt(&vsk->local_addr, dst_ptr,
VMCI_TRANSPORT_PACKET_TYPE_RST,
0, 0, NULL, VSOCK_PROTO_INVALID,
VMCI_INVALID_HANDLE);
} }
static int vmci_transport_send_negotiate(struct sock *sk, size_t size) static int vmci_transport_send_negotiate(struct sock *sk, size_t size)