linux-kernel - Re: [PATCH] geneve: fix max

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Message-Id: <E2E0946D-26C9-46E9-B01A-94595D9EEAF7@cmss.chinamobile.com>
Date:	Mon, 27 Jun 2016 09:13:37 +0800
From:	严海双 <yanhaishuang@...s.chinamobile.com>
To:	zhuyj <zyjzyj2000@...il.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Jesse Gross <jesse@...nel.org>,
	Pravin B Shelar <pshelar@...ira.com>,
	Tom Herbert <tom@...bertland.com>,
	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] geneve: fix max_mtu setting


> On Jun 26, 2016, at 8:35 PM, zhuyj <zyjzyj2000@...il.com> wrote:
> 
> +       if (geneve->remote.sa.sa_family == AF_INET)
> +               max_mtu -= sizeof(struct iphdr);
> +       else
> +               max_mtu -= sizeof(struct ipv6hdr);
> 
> Sorry, if sa_family is not AF_NET, it is AF_INET6?
> 
> There is a lot of macros in include/linux/socket.h.
> 
> Zhu Yanjun
> 

There are only two enumerations AF_INET and AF_INET6 have been assigned in geneve_newlink:

        if (data[IFLA_GENEVE_REMOTE] && data[IFLA_GENEVE_REMOTE6])
                return -EINVAL;

        if (data[IFLA_GENEVE_REMOTE]) {
                remote.sa.sa_family = AF_INET;
                remote.sin.sin_addr.s_addr =
                        nla_get_in_addr(data[IFLA_GENEVE_REMOTE]);
        }

        if (data[IFLA_GENEVE_REMOTE6]) {
                if (!IS_ENABLED(CONFIG_IPV6))
                        return -EPFNOSUPPORT;

                remote.sa.sa_family = AF_INET6;
                remote.sin6.sin6_addr =
                        nla_get_in6_addr(data[IFLA_GENEVE_REMOTE6]);

                if (ipv6_addr_type(&remote.sin6.sin6_addr) &
                    IPV6_ADDR_LINKLOCAL) {
                        netdev_dbg(dev, "link-local remote is unsupported\n");
                        return -EINVAL;
                }
        }

So I think the else case is for AF_INET6 only.