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net: mctp: copy skb ext data when fragmenting

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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: 67737c4572 ("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>
This commit is contained in:
Jeremy Kerr 2024-02-19 17:51:54 +08:00 • committed by Paolo Abeni
parent 9acdc089c0
commit 1394c1dec1
2 changed files with 11 additions and 0 deletions
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8
net/core/skbuff.c
View file

@ -6849,6 +6849,14 @@ 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;

3
net/mctp/route.c
View file

@ -905,6 +905,9 @@ 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)