netdev - Re: [PATCH net] net: rpl: fix rpl header size calculation

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Date:   Sun, 16 Apr 2023 10:37:15 -0600
From:   David Ahern <dsahern@...nel.org>
To:     Alexander Aring <aahringo@...hat.com>, netdev@...r.kernel.org
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, alex.aring@...il.com, daniel@...earbox.net,
        ymittal@...hat.com, mcascell@...hat.com,
        torvalds@...uxfoundation.org, mcr@...delman.ca
Subject: Re: [PATCH net] net: rpl: fix rpl header size calculation

On 4/15/23 3:05 PM, Alexander Aring wrote:
> diff --git a/net/ipv6/rpl.c b/net/ipv6/rpl.c
> index 488aec9e1a74..16e19fec18a4 100644
> --- a/net/ipv6/rpl.c
> +++ b/net/ipv6/rpl.c
> @@ -32,7 +32,7 @@ static void *ipv6_rpl_segdata_pos(const struct ipv6_rpl_sr_hdr *hdr, int i)
>  size_t ipv6_rpl_srh_size(unsigned char n, unsigned char cmpri,
>  			 unsigned char cmpre)
>  {
> -	return (n * IPV6_PFXTAIL_LEN(cmpri)) + IPV6_PFXTAIL_LEN(cmpre);
> +	return 8 + (n * IPV6_PFXTAIL_LEN(cmpri)) + IPV6_PFXTAIL_LEN(cmpre);



no magic numbers; there should be a macro for that size.