linux-kernel - Re: [PATCH net-next] libbpf: add function to setup XDP

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Date:   Mon, 11 Dec 2017 11:24:12 +0900
From:   Toshiaki Makita <makita.toshiaki@....ntt.co.jp>
To:     Eric Leblond <eric@...it.org>, netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, ast@...nel.org, daniel@...earbox.net
Subject: Re: [PATCH net-next] libbpf: add function to setup XDP

On 2017/12/09 23:43, Eric Leblond wrote:
> Most of the code is taken from set_link_xdp_fd() in bpf_load.c and
> slightly modified to be library compliant.
> 
> Signed-off-by: Eric Leblond <eric@...it.org>
...
> +int bpf_set_link_xdp_fd(int ifindex, int fd, __u32 flags)
...
> +	for (nh = (struct nlmsghdr *)buf; NLMSG_OK(nh, len);
> +	     nh = NLMSG_NEXT(nh, len)) {
> +		if (nh->nlmsg_pid != getpid()) {

Generally nlmsg_pid should not be compared with process id.
See man netlink and
https://github.com/iovisor/bcc/pull/1275/commits/69ce96a54c55960c8de3392061254c97b6306a6d

> +			ret = -LIBBPF_ERRNO__WRNGPID;
> +			goto cleanup;
> +		}

-- 
Toshiaki Makita