netdev - Re: [PATCH net-next V6] net: Variable SLAAC: SLAAC with prefixes of arbitrary length in PIO

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Date:   Thu, 19 Nov 2020 10:44:13 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Dmytro Shytyi <dmytro@...tyi.net>
Cc:     "yoshfuji" <yoshfuji@...ux-ipv6.org>,
        "kuznet" <kuznet@....inr.ac.ru>,
        "liuhangbin" <liuhangbin@...il.com>, "davem" <davem@...emloft.net>,
        "netdev" <netdev@...r.kernel.org>,
        "linux-kernel" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next V6] net: Variable SLAAC: SLAAC with prefixes of
 arbitrary length in PIO

On Thu, 19 Nov 2020 14:37:35 +0100 Dmytro Shytyi wrote:
> +struct inet6_ifaddr *ipv6_cmp_rcvd_prsnt_prfxs(struct inet6_ifaddr *ifp,
> +					       struct inet6_dev *in6_dev,
> +					       struct net *net,
> +					       const struct prefix_info *pinfo)
> +{
> +	struct inet6_ifaddr *result_base = NULL;
> +	struct inet6_ifaddr *result = NULL;
> +	struct in6_addr curr_net_prfx;
> +	struct in6_addr net_prfx;
> +	bool prfxs_equal;
> +
> +	result_base = result;
> +	rcu_read_lock();
> +	list_for_each_entry_rcu(ifp, &in6_dev->addr_list, if_list) {
> +		if (!net_eq(dev_net(ifp->idev->dev), net))
> +			continue;
> +		ipv6_addr_prefix_copy(&net_prfx, &pinfo->prefix, pinfo->prefix_len);
> +		ipv6_addr_prefix_copy(&curr_net_prfx, &ifp->addr, pinfo->prefix_len);
> +		prfxs_equal =
> +			ipv6_prefix_equal(&net_prfx, &curr_net_prfx, pinfo->prefix_len);
> +		if (prfxs_equal && pinfo->prefix_len == ifp->prefix_len) {
> +			result = ifp;
> +			in6_ifa_hold(ifp);
> +			break;
> +		}
> +	}
> +	rcu_read_unlock();
> +	if (result_base != result)
> +		ifp = result;
> +	else
> +		ifp = NULL;
> +
> +	return ifp;
> +}

Thanks for adding the helper! Looks like it needs a touch up:

net/ipv6/addrconf.c:2579:22: warning: no previous prototype for ‘ipv6_cmp_rcvd_prsnt_prfxs’ [-Wmissing-prototypes]
 2579 | struct inet6_ifaddr *ipv6_cmp_rcvd_prsnt_prfxs(struct inet6_ifaddr *ifp,
      |                      ^~~~~~~~~~~~~~~~~~~~~~~~~
net/ipv6/addrconf.c:2579:21: warning: symbol 'ipv6_cmp_rcvd_prsnt_prfxs' was not declared. Should it be static?