linux/net/l2tp
Wang Shanker 018f825858 net: l2tp: fix reversed udp6 checksum flags
This patch fixes a bug which causes the behavior of whether to ignore
udp6 checksum of udp6 encapsulated l2tp tunnel contrary to what
userspace program requests.

When the flag `L2TP_ATTR_UDP_ZERO_CSUM6_RX` is set by userspace, it is
expected that udp6 checksums of received packets of the l2tp tunnel
to create should be ignored. In `l2tp_netlink.c`:
`l2tp_nl_cmd_tunnel_create()`, `cfg.udp6_zero_rx_checksums` is set
according to the flag, and then passed to `l2tp_core.c`:
`l2tp_tunnel_create()` and then `l2tp_tunnel_sock_create()`. In
`l2tp_tunnel_sock_create()`, `udp_conf.use_udp6_rx_checksums` is set
the same to `cfg.udp6_zero_rx_checksums`. However, if we want the
checksum to be ignored, `udp_conf.use_udp6_rx_checksums` should be set
to `false`, i.e. be set to the contrary. Similarly, the same should be
done to `udp_conf.use_udp6_tx_checksums`.

Signed-off-by: Miao Wang <shankerwangmiao@gmail.com>
Acked-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-05-01 19:32:16 -04:00
..
Kconfig l2tp: Call udp_sock_create 2014-07-14 16:12:15 -07:00
Makefile l2tp: introduce L2TPv3 IP encapsulation support for IPv6 2012-05-01 09:30:55 -04:00
l2tp_core.c net: l2tp: fix reversed udp6 checksum flags 2016-05-01 19:32:16 -04:00
l2tp_core.h l2tp: auto load type modules 2015-09-25 12:27:22 -07:00
l2tp_debugfs.c ipv6: make lookups simpler and faster 2013-10-09 00:01:25 -04:00
l2tp_eth.c l2tp: auto load type modules 2015-09-25 12:27:22 -07:00
l2tp_ip.c ipv4: l2tp: fix a potential issue in l2tp_ip_recv 2016-04-04 16:00:28 -04:00
l2tp_ip6.c ipv6: l2tp: fix a potential issue in l2tp_ip6_recv 2016-04-04 16:00:28 -04:00
l2tp_netlink.c l2tp: Fix error creating L2TP tunnels 2016-02-17 15:34:47 -05:00
l2tp_ppp.c l2tp: rely on ppp layer for skb scrubbing 2016-01-04 16:45:24 -05:00