[SRU][Xenial][PATCH 1/1] netfilter: xt_checksum: ignore gso skbs

Matthew Ruffell matthew.ruffell at canonical.com
Wed Aug 21 03:20:35 UTC 2019

From: Florian Westphal <fw at strlen.de>

BugLink: https://bugs.launchpad.net/bugs/1840619

Satish Patel reports a skb_warn_bad_offload() splat caused
by -j CHECKSUM rules:

-A POSTROUTING -p tcp -m tcp --sport 80 -j CHECKSUM

The CHECKSUM target has never worked with GSO skbs, and the above rule
makes no sense as kernel will handle checksum updates on transmit.

Unfortunately, there are 3rd party tools that install such rules, so we
cannot reject this from the config plane without potential breakage.

Amend Kconfig text to clarify that the CHECKSUM target is only useful
in virtualized environments, where old dhcp clients that use AF_PACKET
used to discard UDP packets with a 'bad' header checksum and add a
one-time warning in case such rule isn't restricted to UDP.

v2: check IP6T_F_PROTO flag before cmp (Michal Kubecek)

Reported-by: Satish Patel <satish.txt at gmail.com>
Reported-by: Markos Chandras <markos.chandras at suse.com>
Reported-by: Michal Kubecek <mkubecek at suse.cz>
Signed-off-by: Florian Westphal <fw at strlen.de>
Reviewed-by: Michal Kubecek <mkubecek at suse.cz>
Signed-off-by: Pablo Neira Ayuso <pablo at netfilter.org>
(backported from commit 10568f6c5761db24249c610c94d6e44d5505a0ba)
[mruffell: minor context adjustment]
Signed-off-by: Matthew Ruffell <matthew.ruffell at canonical.com>
 net/netfilter/Kconfig       | 12 ++++++------
 net/netfilter/xt_CHECKSUM.c | 23 ++++++++++++++++++++++-
 2 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 4692782b5280..e13e2eecbaf4 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -635,13 +635,13 @@ config NETFILTER_XT_TARGET_CHECKSUM
 	  This option adds a `CHECKSUM' target, which can be used in the iptables mangle
-	  table.
+	  table to work around buggy DHCP clients in virtualized environments.
-	  You can use this target to compute and fill in the checksum in
-	  a packet that lacks a checksum.  This is particularly useful,
-	  if you need to work around old applications such as dhcp clients,
-	  that do not work well with checksum offloads, but don't want to disable
-	  checksum offload in your device.
+	  Some old DHCP clients drop packets because they are not aware
+	  that the checksum would normally be offloaded to hardware and
+	  thus should be considered valid.
+	  This target can be used to fill in the checksum using iptables
+	  when such packets are sent via a virtual network device.
 	  To compile it as a module, choose M here.  If unsure, say N.
diff --git a/net/netfilter/xt_CHECKSUM.c b/net/netfilter/xt_CHECKSUM.c
index 0f642ef8cd26..db286fc0bc32 100644
--- a/net/netfilter/xt_CHECKSUM.c
+++ b/net/netfilter/xt_CHECKSUM.c
@@ -16,6 +16,9 @@
 #include <linux/netfilter/x_tables.h>
 #include <linux/netfilter/xt_CHECKSUM.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
 MODULE_AUTHOR("Michael S. Tsirkin <mst at redhat.com>");
 MODULE_DESCRIPTION("Xtables: checksum modification");
@@ -25,7 +28,7 @@ MODULE_ALIAS("ip6t_CHECKSUM");
 static unsigned int
 checksum_tg(struct sk_buff *skb, const struct xt_action_param *par)
-	if (skb->ip_summed == CHECKSUM_PARTIAL)
+	if (skb->ip_summed == CHECKSUM_PARTIAL && !skb_is_gso(skb))
 	return XT_CONTINUE;
@@ -34,6 +37,8 @@ checksum_tg(struct sk_buff *skb, const struct xt_action_param *par)
 static int checksum_tg_check(const struct xt_tgchk_param *par)
 	const struct xt_CHECKSUM_info *einfo = par->targinfo;
+	const struct ip6t_ip6 *i6 = par->entryinfo;
+	const struct ipt_ip *i4 = par->entryinfo;
 	if (einfo->operation & ~XT_CHECKSUM_OP_FILL) {
 		pr_info("unsupported CHECKSUM operation %x\n", einfo->operation);
@@ -43,6 +48,22 @@ static int checksum_tg_check(const struct xt_tgchk_param *par)
 		pr_info("no CHECKSUM operation enabled\n");
 		return -EINVAL;
+	switch (par->family) {
+	case NFPROTO_IPV4:
+		if (i4->proto == IPPROTO_UDP &&
+		    (i4->invflags & XT_INV_PROTO) == 0)
+			return 0;
+		break;
+	case NFPROTO_IPV6:
+		if ((i6->flags & IP6T_F_PROTO) &&
+		    i6->proto == IPPROTO_UDP &&
+		    (i6->invflags & XT_INV_PROTO) == 0)
+			return 0;
+		break;
+	}
+	pr_warn_once("CHECKSUM should be avoided.  If really needed, restrict with \"-p udp\" and only use in OUTPUT\n");
 	return 0;

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