netdev - Re: How to find I/F to destination

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Date:	Fri, 04 May 2007 14:33:45 +0100
From:	David Howells <dhowells@...hat.com>
To:	Evgeniy Polyakov <johnpol@....mipt.ru>
Cc:	netdev@...r.kernel.org, Patrick McHardy <kaber@...sh.net>
Subject: Re: How to find I/F to destination 

Evgeniy Polyakov <johnpol@....mipt.ru> wrote:

> That is the same, dst is dereferenced as rtable.
> Cloned dst is returned, so it must be put back at the ned of the usage.

If that's the case, then why do you bother to clone it in route_get_raw()?
Surely that'll give you *two* clones...

BTW, it seems to work.  The attached function gives me:

	[0mount ] <== rxrpc_assess_MTU_size() [if_mtu 1500]

Thanks!

David

---
static void rxrpc_assess_MTU_size(struct rxrpc_peer *peer)
{
	struct rtable *rt;
	struct flowi fl;
	int ret;

	peer->if_mtu = 1500;

	memset(&fl, 0, sizeof(fl));

	switch (peer->srx.transport.family) {
	case AF_INET:
		fl.oif = 0;
		fl.proto = IPPROTO_UDP,
		fl.nl_u.ip4_u.saddr = 0;
		fl.nl_u.ip4_u.daddr = peer->srx.transport.sin.sin_addr.s_addr;
		fl.nl_u.ip4_u.tos = 0;
		/* assume AFS.CM talking to AFS.FS */
		fl.uli_u.ports.sport = htonl(7001);
		fl.uli_u.ports.dport = htonl(7000);
		break;
	default:
		BUG();
	}

	ret = ip_route_output_key(&rt, &fl);
	if (ret < 0) {
		kleave(" [route err %d]", ret);
		return;
	}

	peer->if_mtu = dst_mtu(&rt->u.dst);
	kleave(" [if_mtu %u]", peer->if_mtu);
}
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