linux-kernel - Re: [PATCH] ipv4: add description about martian source

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Message-ID: <7390f20d-e679-6fc3-62cb-95850871561d@infradead.org>
Date:   Sun, 13 Feb 2022 19:05:47 -0800
From:   Randy Dunlap <rdunlap@...radead.org>
To:     cgel.zte@...il.com, davem@...emloft.net
Cc:     yoshfuji@...ux-ipv6.org, dsahern@...nel.org, kuba@...nel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Zhang Yunkai <zhang.yunkai@....com.cn>
Subject: Re: [PATCH] ipv4: add description about martian source

Hi--

On 2/13/22 19:01, cgel.zte@...il.com wrote:
> From: Zhang Yunkai <zhang.yunkai@....com.cn>
> 
> When multiple containers are running in the environment and multiple
> macvlan network port are configured in each container, a lot of martian
> source prints will appear after martian_log is enabled.

Does it need to use one of the printk_ratelimited() calls?
or are they all unique?

> Such as:
> IPv4: martian source 173.254.95.16 from 173.254.100.109,
> on dev eth0
> ll header: 00000000: ff ff ff ff ff ff 40 00 ad fe 64 6d
> 08 06        ......@...dm..
> IPv4: martian source 173.254.95.16 from 173.254.100.109,
> on dev eth1
> ll header: 00000000: ff ff ff ff ff ff 40 00 ad fe 64 6d
> 08 06        ......@...dm..
> 
> There is no description of this kind of source in the RFC1812.
> 
> Signed-off-by: Zhang Yunkai <zhang.yunkai@....com.cn>
> ---
>  net/ipv4/fib_frontend.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
> index 4d61ddd8a0ec..3564308e849a 100644
> --- a/net/ipv4/fib_frontend.c
> +++ b/net/ipv4/fib_frontend.c
> @@ -436,6 +436,9 @@ int fib_validate_source(struct sk_buff *skb, __be32 src, __be32 dst,
>  		if (net->ipv4.fib_has_custom_local_routes ||
>  		    fib4_has_custom_rules(net))
>  			goto full_check;
> +		/* Within the same container,it is regarded as a martian source,

Please add a space after the comma:         , it is

> +		 * and the same host but different containers are not.
> +		 */
>  		if (inet_lookup_ifaddr_rcu(net, src))
>  			return -EINVAL;
>  

-- 
~Randy