[PATCH 6.6 263/638] net: mctp: copy skb ext data when fragmenting

Sasha Levin
2024-03-24T23:05:36Z

From: Jeremy Kerr <jk@codeconstruct.com.au>

[ Upstream commit 1394c1dec1c619a46867ed32791a29695372bff8 ]

If we're fragmenting on local output, the original packet may contain
ext data for the MCTP flows. We'll want this in the resulting fragment
skbs too.

So, do a skb_ext_copy() in the fragmentation path, and implement the
MCTP-specific parts of an ext copy operation.

Fixes: 67737c457281 ("mctp: Pass flow data & flow release events to drivers")
Reported-by: Jian Zhang <zhangjian.3032@bytedance.com>
Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/core/skbuff.c | 8 ++++++++
net/mctp/route.c | 3 +++
2 files changed, 11 insertions(+)

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 011d69029112a..60876262b3fb3 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -6659,6 +6659,14 @@ static struct skb_ext *skb_ext_maybe_cow(struct skb_ext *old,
for (i = 0; i < sp->len; i++)
xfrm_state_hold(sp->xvec[i]);
}
+#endif
+#ifdef CONFIG_MCTP_FLOWS
+ if (old_active & (1 << SKB_EXT_MCTP)) {
+ struct mctp_flow *flow = skb_ext_get_ptr(old, SKB_EXT_MCTP);
+
+ if (flow->key)
+ refcount_inc(&flow->key->refs);
+ }
#endif
__skb_ext_put(old);
return new;
diff --git a/net/mctp/route.c b/net/mctp/route.c
index ceee44ea09d97..01c530dbc1a65 100644
--- a/net/mctp/route.c
+++ b/net/mctp/route.c
@@ -843,6 +843,9 @@ static int mctp_do_fragment_route(struct mctp_route *rt, struct sk_buff *skb,
/* copy message payload */
skb_copy_bits(skb, pos, skb_transport_header(skb2), size);

+ /* we need to copy the extensions, for MCTP flow data */
+ skb_ext_copy(skb2, skb);
+
/* do route */
rc = rt->output(rt, skb2);
if (rc)
--
2.43.0