4.4-stable review patch. If anyone has any objections, please let me know.
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From: Jorgen Hansen jhansen@vmware.com
[ Upstream commit a915b982d8f5e4295f64b8dd37ce753874867e88 ]
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: d021c344051a ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/vmw_vsock/vmci_transport.c | 67 ++++++++++++++++++++++++++++++----------- 1 file changed, 50 insertions(+), 17 deletions(-)
--- a/net/vmw_vsock/vmci_transport.c +++ b/net/vmw_vsock/vmci_transport.c @@ -273,6 +273,31 @@ vmci_transport_send_control_pkt_bh(struc }
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 vmci_transport_send_control_pkt(struct sock *sk, enum vmci_transport_packet_type type, u64 size, @@ -281,9 +306,7 @@ vmci_transport_send_control_pkt(struct s u16 proto, struct vmci_handle handle) { - struct vmci_transport_packet *pkt; struct vsock_sock *vsk; - int err;
vsk = vsock_sk(sk);
@@ -293,17 +316,10 @@ vmci_transport_send_control_pkt(struct s if (!vsock_addr_bound(&vsk->remote_addr)) return -EINVAL;
- pkt = kmalloc(sizeof(*pkt), GFP_KERNEL); - if (!pkt) - return -ENOMEM; - - err = __vmci_transport_send_control_pkt(pkt, &vsk->local_addr, - &vsk->remote_addr, type, size, - mode, wait, proto, handle, - true); - kfree(pkt); - - return err; + return vmci_transport_alloc_send_control_pkt(&vsk->local_addr, + &vsk->remote_addr, + type, size, mode, + wait, proto, handle); }
static int vmci_transport_send_reset_bh(struct sockaddr_vm *dst, @@ -321,12 +337,29 @@ static int vmci_transport_send_reset_bh( static int vmci_transport_send_reset(struct sock *sk, 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) return 0; - return vmci_transport_send_control_pkt(sk, - VMCI_TRANSPORT_PACKET_TYPE_RST, - 0, 0, NULL, VSOCK_PROTO_INVALID, - VMCI_INVALID_HANDLE); + + vsk = vsock_sk(sk); + + 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)