netdev - [PATCH iproute2 6/7] l2tp: read IPv6 UDP checksum attributes from kernel

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Date:   Fri,  4 Nov 2016 23:11:10 +0000
From:   Asbjørn Sloth Tønnesen 
        <asbjorn@...jorn.st>
To:     Stephen Hemminger <stephen@...workplumber.org>
Cc:     James Chapman <jchapman@...alix.com>, netdev@...r.kernel.org
Subject: [PATCH iproute2 6/7] l2tp: read IPv6 UDP checksum attributes from kernel

In case of an older kernel that doesn't set L2TP_ATTR_UDP_ZERO_CSUM6_{R,T}X
the old hard-coded value is being preserved, since the attribute flag will be
missing.

Signed-off-by: Asbjørn Sloth Tønnesen <asbjorn@...jorn.st>
---
 ip/ipl2tp.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/ip/ipl2tp.c b/ip/ipl2tp.c
index 6d00d09..8f3268d 100644
--- a/ip/ipl2tp.c
+++ b/ip/ipl2tp.c
@@ -296,12 +296,9 @@ static int get_response(struct nlmsghdr *n, void *arg)
 		p->l2spec_len = rta_getattr_u8(attrs[L2TP_ATTR_L2SPEC_LEN]);
 
 	p->udp_csum = !!attrs[L2TP_ATTR_UDP_CSUM];
-	/*
-	 * Not fetching from L2TP_ATTR_UDP_ZERO_CSUM6_{T,R}X because the
-	 * kernel doesn't send it so just leave it as default value.
-	 */
-	p->udp6_csum_tx = 1;
-	p->udp6_csum_rx = 1;
+	p->udp6_csum_tx = !attrs[L2TP_ATTR_UDP_ZERO_CSUM6_TX];
+	p->udp6_csum_rx = !attrs[L2TP_ATTR_UDP_ZERO_CSUM6_RX];
+
 	if (attrs[L2TP_ATTR_COOKIE])
 		memcpy(p->cookie, RTA_DATA(attrs[L2TP_ATTR_COOKIE]),
 		       p->cookie_len = RTA_PAYLOAD(attrs[L2TP_ATTR_COOKIE]));
-- 
2.10.1