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| author | Benedict Wong <benedictwong@google.com> | 2019-01-14 11:24:38 -0800 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2019-01-16 13:10:55 +0100 |
| commit | e2612cd496e7b465711d219ea6118893d7253f52 (patch) | |
| tree | 24d472c27fda2886de4cb24fdc66ef4322aca808 /net/xfrm | |
| parent | 35e6103861a3a970de6c84688c6e7a1f65b164ca (diff) | |
| download | lwn-e2612cd496e7b465711d219ea6118893d7253f52.tar.gz lwn-e2612cd496e7b465711d219ea6118893d7253f52.zip | |
xfrm: Make set-mark default behavior backward compatible
Fixes 9b42c1f179a6, which changed the default route lookup behavior for
tunnel mode SAs in the outbound direction to use the skb mark, whereas
previously mark=0 was used if the output mark was unspecified. In
mark-based routing schemes such as Android’s, this change in default
behavior causes routing loops or lookup failures.
This patch restores the default behavior of using a 0 mark while still
incorporating the skb mark if the SET_MARK (and SET_MARK_MASK) is
specified.
Tested with additions to Android's kernel unit test suite:
https://android-review.googlesource.com/c/kernel/tests/+/860150
Fixes: 9b42c1f179a6 ("xfrm: Extend the output_mark to support input direction and masking")
Signed-off-by: Benedict Wong <benedictwong@google.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/xfrm')
| -rw-r--r-- | net/xfrm/xfrm_policy.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c index 8cfd75b62396..ba0a4048c846 100644 --- a/net/xfrm/xfrm_policy.c +++ b/net/xfrm/xfrm_policy.c @@ -2600,7 +2600,10 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy, dst_copy_metrics(dst1, dst); if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) { - __u32 mark = xfrm_smark_get(fl->flowi_mark, xfrm[i]); + __u32 mark = 0; + + if (xfrm[i]->props.smark.v || xfrm[i]->props.smark.m) + mark = xfrm_smark_get(fl->flowi_mark, xfrm[i]); family = xfrm[i]->props.family; dst = xfrm_dst_lookup(xfrm[i], tos, fl->flowi_oif, |