netdev - Re: [PATCH v3] icmp: support rfc5837

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Message-ID: <f65cb281-c6d5-d1c9-a90d-3281cdb75620@gmail.com>
Date:   Fri, 19 Mar 2021 08:55:00 -0600
From:   David Ahern <dsahern@...il.com>
To:     ishaangandhi <ishaangandhi@...il.com>, davem@...emloft.net
Cc:     netdev@...r.kernel.org, willemb@...gle.com,
        Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH v3] icmp: support rfc5837

On 3/17/21 4:19 PM, ishaangandhi wrote:
> +void icmp_identify_arrival_interface(struct sk_buff *skb, struct net *net, int room,
> +				     char *icmph, int ip_version)
> +{
> +	unsigned int ext_len, orig_len, word_aligned_orig_len, offset, extra_space_needed,
> +		     if_index, mtu = 0, name_len = 0, name_subobj_len = 0;
> +	struct interface_ipv4_addr_sub_obj ip4_addr_subobj = {.addr = 0};
> +	struct interface_ipv6_addr_sub_obj ip6_addr_subobj;
> +	struct icmp_extobj_hdr *iio_hdr;
> +	struct inet6_ifaddr ip6_ifaddr;
> +	struct inet6_dev *dev6 = NULL;
> +	struct icmp_ext_hdr *ext_hdr;
> +	char *name = NULL, ctype;
> +	struct net_device *dev;
> +	void *subobj_offset;
> +
> +	skb_linearize(skb);
> +	if_index = inet_iif(skb);

inet_iif is an IPv4 helper; it should not be used for v6 skb's.