This is a note to let you know that I've just added the patch titled
selftests: net: csum: Fix checksums for packets with non-zero padding
to the 6.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
selftests-net-csum-fix-checksums-for-packets-with-no.patch
and it can be found in the queue-6.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 760403a07ddf3f6f73307e8faf6900b6e805e9cb
Author: Sean Anderson <sean.anderson@xxxxxxxxx>
Date: Fri Sep 6 17:07:43 2024 -0400
selftests: net: csum: Fix checksums for packets with non-zero padding
[ Upstream commit e8a63d473b49011a68a748aea1c8aefa046ebacf ]
Padding is not included in UDP and TCP checksums. Therefore, reduce the
length of the checksummed data to include only the data in the IP
payload. This fixes spurious reported checksum failures like
rx: pkt: sport=33000 len=26 csum=0xc850 verify=0xf9fe
pkt: bad csum
Technically it is possible for there to be trailing bytes after the UDP
data but before the Ethernet padding (e.g. if sizeof(ip) + sizeof(udp) +
udp.len < ip.len). However, we don't generate such packets.
Fixes: 91a7de85600d ("selftests/net: add csum offload test")
Signed-off-by: Sean Anderson <sean.anderson@xxxxxxxxx>
Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Link: https://patch.msgid.link/20240906210743.627413-1-sean.anderson@xxxxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/testing/selftests/net/lib/csum.c b/tools/testing/selftests/net/lib/csum.c
index b9f3fc3c3426..e0a34e5e8dd5 100644
--- a/tools/testing/selftests/net/lib/csum.c
+++ b/tools/testing/selftests/net/lib/csum.c
@@ -654,10 +654,16 @@ static int recv_verify_packet_ipv4(void *nh, int len)
{
struct iphdr *iph = nh;
uint16_t proto = cfg_encap ? IPPROTO_UDP : cfg_proto;
+ uint16_t ip_len;
if (len < sizeof(*iph) || iph->protocol != proto)
return -1;
+ ip_len = ntohs(iph->tot_len);
+ if (ip_len > len || ip_len < sizeof(*iph))
+ return -1;
+
+ len = ip_len;
iph_addr_p = &iph->saddr;
if (proto == IPPROTO_TCP)
return recv_verify_packet_tcp(iph + 1, len - sizeof(*iph));
@@ -669,16 +675,22 @@ static int recv_verify_packet_ipv6(void *nh, int len)
{
struct ipv6hdr *ip6h = nh;
uint16_t proto = cfg_encap ? IPPROTO_UDP : cfg_proto;
+ uint16_t ip_len;
if (len < sizeof(*ip6h) || ip6h->nexthdr != proto)
return -1;
+ ip_len = ntohs(ip6h->payload_len);
+ if (ip_len > len - sizeof(*ip6h))
+ return -1;
+
+ len = ip_len;
iph_addr_p = &ip6h->saddr;
if (proto == IPPROTO_TCP)
- return recv_verify_packet_tcp(ip6h + 1, len - sizeof(*ip6h));
+ return recv_verify_packet_tcp(ip6h + 1, len);
else
- return recv_verify_packet_udp(ip6h + 1, len - sizeof(*ip6h));
+ return recv_verify_packet_udp(ip6h + 1, len);
}
/* return whether auxdata includes TP_STATUS_CSUM_VALID */
