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l2tp: read IPv6 UDP checksum attributes from kernel

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

Signed-off-by: Asbjørn Sloth Tønnesen <asbjorn@asbjorn.st>
This commit is contained in:
Asbjørn Sloth Tønnesen 2016-11-16 22:45:23 +00:00 committed by Stephen Hemminger
parent c73fad7860
commit 35cc6ded4f
1 changed files with 3 additions and 6 deletions
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9
ip/ipl2tp.c
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@ -292,12 +292,9 @@ static int get_response(struct nlmsghdr *n, void *arg)
if (attrs[L2TP_ATTR_UDP_CSUM])
p->udp_csum = !!rta_getattr_u8(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]));