* [PATCH] gdhcp: Allow client to work on veth devices
@ 2024-04-17 16:22 Denis Kenzior
2024-04-17 17:00 ` patchwork-bot+connman
0 siblings, 1 reply; 2+ messages in thread
From: Denis Kenzior @ 2024-04-17 16:22 UTC (permalink / raw)
To: connman; +Cc: Denis Kenzior
veth devices do not compute a checksum over the entire message. They
simply pre-compute the pseudo-header portion and include this in the
checksum field. Support such devices by computing the partial checksum.
If the partial checksum matches, accept the packet.
---
gdhcp/client.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/gdhcp/client.c b/gdhcp/client.c
index c58c7be91143..2afa19e6e2ea 100644
--- a/gdhcp/client.c
+++ b/gdhcp/client.c
@@ -1355,8 +1355,13 @@ static int dhcp_recv_l2_packet(struct dhcp_packet *dhcp_pkt, int fd,
packet.ip.tot_len = packet.udp.len; /* yes, this is needed */
check = packet.udp.check;
packet.udp.check = 0;
- if (check && check != dhcp_checksum(&packet, bytes))
- return -1;
+
+ if (check) {
+ uint16_t partial = ~dhcp_checksum(&packet, sizeof(struct iphdr));
+
+ if (check != partial && check != dhcp_checksum(&packet, bytes))
+ return -1;
+ }
memcpy(dhcp_pkt, &packet.data, bytes - (sizeof(packet.ip) +
sizeof(packet.udp)));
--
2.44.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] gdhcp: Allow client to work on veth devices
2024-04-17 16:22 [PATCH] gdhcp: Allow client to work on veth devices Denis Kenzior
@ 2024-04-17 17:00 ` patchwork-bot+connman
0 siblings, 0 replies; 2+ messages in thread
From: patchwork-bot+connman @ 2024-04-17 17:00 UTC (permalink / raw)
To: Denis Kenzior; +Cc: connman
Hello:
This patch was applied to connman.git (master)
by Denis Kenzior <denkenz@gmail.com>:
On Wed, 17 Apr 2024 11:22:24 -0500 you wrote:
> veth devices do not compute a checksum over the entire message. They
> simply pre-compute the pseudo-header portion and include this in the
> checksum field. Support such devices by computing the partial checksum.
> If the partial checksum matches, accept the packet.
> ---
> gdhcp/client.c | 9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
Here is the summary with links:
- gdhcp: Allow client to work on veth devices
https://git.kernel.org/pub/scm/network/connman/connman.git/?id=1d064a14ce45
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2024-04-17 17:00 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2024-04-17 16:22 [PATCH] gdhcp: Allow client to work on veth devices Denis Kenzior
2024-04-17 17:00 ` patchwork-bot+connman
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).