netdev - Re: [RFC v2 bpf-next 5/7] libbpf: add API to get XDP/XSK supported features

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Message-ID: <20230117165804.65118609@kernel.org>
Date:   Tue, 17 Jan 2023 16:58:04 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Lorenzo Bianconi <lorenzo@...nel.org>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, davem@...emloft.net,
        hawk@...nel.org, pabeni@...hat.com, edumazet@...gle.com,
        toke@...hat.com, memxor@...il.com, alardam@...il.com,
        saeedm@...dia.com, anthony.l.nguyen@...el.com, gospo@...adcom.com,
        vladimir.oltean@....com, nbd@....name, john@...ozen.org,
        leon@...nel.org, simon.horman@...igine.com, aelior@...vell.com,
        christophe.jaillet@...adoo.fr, ecree.xilinx@...il.com,
        mst@...hat.com, bjorn@...nel.org, magnus.karlsson@...el.com,
        maciej.fijalkowski@...el.com, intel-wired-lan@...ts.osuosl.org,
        lorenzo.bianconi@...hat.com
Subject: Re: [RFC v2 bpf-next 5/7] libbpf: add API to get XDP/XSK supported
 features

On Sat, 14 Jan 2023 16:54:35 +0100 Lorenzo Bianconi wrote:
> +	struct nlattr *na = (struct nlattr *)(NLMSG_DATA(nh) + GENL_HDRLEN);
> +
> +	na = (struct nlattr *)((void *)na + NLA_ALIGN(na->nla_len));
> +	if (na->nla_type == CTRL_ATTR_FAMILY_ID) {

Assuming layout of attributes within a message is a hard no-no.