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sctp: add support for dscp and flowlabel per transport

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Like some other per transport params, flowlabel and dscp are added
in transport, asoc and sctp_sock. By default, transport sets its
value from asoc's, and asoc does it from sctp_sock. flowlabel
only works for ipv6 transport.

Other than that they need to be passed down in sctp_xmit, flow4/6
also needs to set them before looking up route in get_dst.

Note that it uses '& 0x100000' to check if flowlabel is set and
'& 0x1' (tos 1st bit is unused) to check if dscp is set by users,
so that they could be set to 0 by sockopt in next patch.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
2018-07-02 18:21:12 +08:00
committed by David S. Miller
parent 69b9e1e07d
commit 8a9c58d28d
5 changed files with 44 additions and 6 deletions
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7
net/sctp/associola.c
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@@ -115,6 +115,9 @@ static struct sctp_association *sctp_association_init(
/* Initialize path max retrans value. */
asoc->pathmaxrxt = sp->pathmaxrxt;
asoc->flowlabel = sp->flowlabel;
asoc->dscp = sp->dscp;
/* Initialize default path MTU. */
asoc->pathmtu = sp->pathmtu;
@@ -647,6 +650,10 @@ struct sctp_transport *sctp_assoc_add_peer(struct sctp_association *asoc,
peer->sackdelay = asoc->sackdelay;
peer->sackfreq = asoc->sackfreq;
if (addr->sa.sa_family == AF_INET6)
peer->flowlabel = asoc->flowlabel;
peer->dscp = asoc->dscp;
/* Enable/disable heartbeat, SACK delay, and path MTU discovery
* based on association setting.
*/