netdev - Re: [PATCH] ipv6: Fix the pmtu path for connected UDP socket

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Message-ID: <20160326001600.GA29626@kafai-mba.local>
Date:	Fri, 25 Mar 2016 17:16:08 -0700
From:	Martin KaFai Lau <kafai@...com>
To:	Wei Wang <tracywwnj@...il.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	Cong Wang <xiyou.wangcong@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Wei Wang <weiwan@...gle.com>,
	David Miller <davem@...emloft.net>,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: [PATCH] ipv6: Fix the pmtu path for connected UDP socket

On Fri, Mar 25, 2016 at 04:55:27PM -0700, Martin KaFai Lau wrote:
>  void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
>  {
> +	struct dst_entry *odst;
> +
> +	odst = sk_dst_get(sk);
> +
>  	ip6_update_pmtu(skb, sock_net(sk), mtu,
>  			sk->sk_bound_dev_if, sk->sk_mark);
> +
> +	if (odst && !odst->error &&
> +	    !ip6_dst_check(odst, inet6_sk(sk)->dst_cookie)) {
> +		struct dst_entry *ndst;
> +		struct flowi6 fl6;
> +
> +		build_skb_flow_key(&fl6, skb, sock_net(sk),
> +				   sk->sk_bound_dev_if, sk->sk_mark);
> +		ndst = ip6_route_output(sock_net(sk), NULL, &fl6);
> +		if (!ndst->error)
> +			ip6_dst_store(sk, ndst, NULL, NULL);
oops...missed:
		else
			dst_release(ndst);
> +	}
> +
> +	dst_release(odst);
>  }
>  EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
>
> --
> 2.5.1