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| author | Craig Gallek <cgallek@google.com> | 2017-04-26 14:37:45 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-05-01 14:52:45 -0400 |
| commit | 89a23c8b528bd2c89f3981573d6cd7d23840c8a6 (patch) | |
| tree | 47e6c25d2e0cbc49c80860937ef60bf1a1950c19 /net/ipv4 | |
| parent | f9ed236c2aed30eef4b2c8025973631714655301 (diff) | |
| download | linux-89a23c8b528bd2c89f3981573d6cd7d23840c8a6.tar.bz2 | |
ip6_tunnel: Fix missing tunnel encapsulation limit option
The IPv6 tunneling code tries to insert IPV6_TLV_TNL_ENCAP_LIMIT and
IPV6_TLV_PADN options when an encapsulation limit is defined (the
default is a limit of 4). An MTU adjustment is done to account for
these options as well. However, the options are never present in the
generated packets.
The issue appears to be a subtlety between IPV6_DSTOPTS and
IPV6_RTHDRDSTOPTS defined in RFC 3542. When the IPIP tunnel driver was
written, the encap limit options were included as IPV6_RTHDRDSTOPTS in
dst0opt of struct ipv6_txoptions. Later, ipv6_push_nfrags_opts was
(correctly) updated to require IPV6_RTHDR options when IPV6_RTHDRDSTOPTS
are to be used. This caused the options to no longer be included in v6
encapsulated packets.
The fix is to use IPV6_DSTOPTS (in dst1opt of struct ipv6_txoptions)
instead. IPV6_DSTOPTS do not have the additional IPV6_RTHDR requirement.
Fixes: 1df64a8569c7: ("[IPV6]: Add ip6ip6 tunnel driver.")
Fixes: 333fad5364d6: ("[IPV6]: Support several new sockopt / ancillary data in Advanced API (RFC3542)")
Signed-off-by: Craig Gallek <kraig@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
0 files changed, 0 insertions, 0 deletions