Respect guest tcp window size and stop sending tcp segments to guest
if guest's receive window is closed.
This fixes the TCP hang I'm seeing where guest and host are transferring
big chuck of data.
This problem was not triggered when guest and external host
communicates, probably because guest to external host communication
walks through real network and is much slower than guest and host
communication. Thus, guest's receive window has little chance to be
closed.
v2: use pthread_cond_wait to wait
Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This pach makes tcp between 'guest ip' and 'host virtual ip' work in UIP mode.
(The defulat guest ip is 192.168.33.15, host virtual ip is 192.168.33.1)
guest$ wget http://192.168.33.1/file
guest$ ssh 192.168.33.1
Without this patch, user has to figure out the ip address of host's
interface (e.g. eth0) and use that ip address to access host.
With this patch, user can simply use the virtual host ip.
Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
In uip_dhcp_get_dns() we try to open /etc/resolv.conf. If we fail to
open it we then SEGV trying to fclose() it.
Fix the code to just return directly if we can't open it.
Acked-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This patch removes the manual/usermode dhcp client configuration and instead
uses the DHCP client built within the kernel.
Since this client is tightly integrated with NFS (if NFS config is set), we
will add a specific NFS root addr in our DHCP offer to point it to a non
existent address so that we won't hang trying to poke it for our root.
Acked-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Sasha Levin <levinsasha928@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
DHCP packages are handled by the hypervisor, they are not sent to remote
servers. In contrast, all other non-DHCP UDP packages are sent to remote
servers.
Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Use uip_dhcp_get_dns() in uip_init() to get DNS information from host
for DHCP.
Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
uip_tx_do_ipv4_udp_dhcp() is used to handle DHCP packages from guest.
Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This patch get domain name and nameserver information from host config
file /etc/resolv.conf.
Guest can obtain DNS information through DHCP.
Signed-off-by: Asias He <asias.hejun@gmail.com>
[ penberg@kernel.org: check fscanf() for errors ]
Signed-off-by: Pekka Enberg <penberg@kernel.org>
If DHCP DISCOVER or DHCP REQUEST is found, reply with DHCP OFFER or DHCP
ACK respectively.
Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This patch checks:
- sport and dport
- magic cookie
to detemine whether a UDP package is a DHCP package.
Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This helper cooks a ethernet package and virtio header for UDP.
This patch also makes uip_udp_socket_thread() shorter.
Signed-off-by: Asias He <asias.hejun@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Asias He