* [PATCH net] sctp: set flow sport from saddr only when it's 0
@ 2019-01-21 18:42 Xin Long
2019-01-25 2:25 ` David Miller
0 siblings, 1 reply; 2+ messages in thread
From: Xin Long @ 2019-01-21 18:42 UTC (permalink / raw)
To: linux-kernel, network dev, linux-sctp
Cc: davem, Marcelo Ricardo Leitner, Neil Horman
Now sctp_transport_pmtu() passes transport->saddr into .get_dst() to set
flow sport from 'saddr'. However, transport->saddr is set only when
transport->dst exists in sctp_transport_route().
If sctp_transport_pmtu() is called without transport->saddr set, like
when transport->dst doesn't exists, the flow sport will be set to 0
from transport->saddr, which will cause a wrong route to be got.
Commit 6e91b578bf3f ("sctp: re-use sctp_transport_pmtu in
sctp_transport_route") made the issue be triggered more easily
since sctp_transport_pmtu() would be called in sctp_transport_route()
after that.
In gerneral, fl4->fl4_sport should always be set to
htons(asoc->base.bind_addr.port), unless transport->asoc doesn't exist
in sctp_v4/6_get_dst(), which is the case:
sctp_ootb_pkt_new() ->
sctp_transport_route()
For that, we can simply handle it by setting flow sport from saddr only
when it's 0 in sctp_v4/6_get_dst().
Fixes: 6e91b578bf3f ("sctp: re-use sctp_transport_pmtu in sctp_transport_route")
Reported-by: Ying Xu <yinxu@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
---
net/sctp/ipv6.c | 3 ++-
net/sctp/protocol.c | 3 ++-
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index ed8e006..6200cd2 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -280,7 +280,8 @@ static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
if (saddr) {
fl6->saddr = saddr->v6.sin6_addr;
- fl6->fl6_sport = saddr->v6.sin6_port;
+ if (!fl6->fl6_sport)
+ fl6->fl6_sport = saddr->v6.sin6_port;
pr_debug("src=%pI6 - ", &fl6->saddr);
}
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 4e0eeb1..6abc8b2 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -440,7 +440,8 @@ static void sctp_v4_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
}
if (saddr) {
fl4->saddr = saddr->v4.sin_addr.s_addr;
- fl4->fl4_sport = saddr->v4.sin_port;
+ if (!fl4->fl4_sport)
+ fl4->fl4_sport = saddr->v4.sin_port;
}
pr_debug("%s: dst:%pI4, src:%pI4 - ", __func__, &fl4->daddr,
--
2.1.0
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH net] sctp: set flow sport from saddr only when it's 0
2019-01-21 18:42 [PATCH net] sctp: set flow sport from saddr only when it's 0 Xin Long
@ 2019-01-25 2:25 ` David Miller
0 siblings, 0 replies; 2+ messages in thread
From: David Miller @ 2019-01-25 2:25 UTC (permalink / raw)
To: lucien.xin; +Cc: linux-kernel, netdev, linux-sctp, marcelo.leitner, nhorman
From: Xin Long <lucien.xin@gmail.com>
Date: Tue, 22 Jan 2019 02:42:41 +0800
> Now sctp_transport_pmtu() passes transport->saddr into .get_dst() to set
> flow sport from 'saddr'. However, transport->saddr is set only when
> transport->dst exists in sctp_transport_route().
>
> If sctp_transport_pmtu() is called without transport->saddr set, like
> when transport->dst doesn't exists, the flow sport will be set to 0
> from transport->saddr, which will cause a wrong route to be got.
>
> Commit 6e91b578bf3f ("sctp: re-use sctp_transport_pmtu in
> sctp_transport_route") made the issue be triggered more easily
> since sctp_transport_pmtu() would be called in sctp_transport_route()
> after that.
>
> In gerneral, fl4->fl4_sport should always be set to
> htons(asoc->base.bind_addr.port), unless transport->asoc doesn't exist
> in sctp_v4/6_get_dst(), which is the case:
>
> sctp_ootb_pkt_new() ->
> sctp_transport_route()
>
> For that, we can simply handle it by setting flow sport from saddr only
> when it's 0 in sctp_v4/6_get_dst().
>
> Fixes: 6e91b578bf3f ("sctp: re-use sctp_transport_pmtu in sctp_transport_route")
> Reported-by: Ying Xu <yinxu@redhat.com>
> Signed-off-by: Xin Long <lucien.xin@gmail.com>
Applied and queued up for -stable.
^ permalink raw reply [flat|nested] 2+ messages in thread
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