netdev - Re: [PATCH ipsec-next,v2 3/3] xfrm: lwtunnel: add lwtunnel support for xfrm interfaces in collect

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Date:   Thu, 25 Aug 2022 16:30:58 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     Eyal Birger <eyal.birger@...il.com>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
        dsahern@...nel.org, contact@...elbtn.com, pablo@...filter.org
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: Re: [PATCH ipsec-next,v2 3/3] xfrm: lwtunnel: add lwtunnel support
 for xfrm interfaces in collect_md mode


Le 25/08/2022 à 15:46, Eyal Birger a écrit :
> Allow specifying the xfrm interface if_id and link as part of a route
> metadata using the lwtunnel infrastructure.
> 
> This allows for example using a single xfrm interface in collect_md
> mode as the target of multiple routes each specifying a different if_id.
> 
> With the appropriate changes to iproute2, considering an xfrm device
> ipsec1 in collect_md mode one can for example add a route specifying
> an if_id like so:
> 
> ip route add <SUBNET> dev ipsec1 encap xfrm if_id 1
> 
> In which case traffic routed to the device via this route would use
> if_id in the xfrm interface policy lookup.
> 
> Or in the context of vrf, one can also specify the "link" property:
> 
> ip route add <SUBNET> dev ipsec1 encap xfrm if_id 1 dev eth15
> 
> Signed-off-by: Eyal Birger <eyal.birger@...il.com>

[snip]

> +static int xfrmi_build_state(struct net *net, struct nlattr *nla,
> +			     unsigned int family, const void *cfg,
> +			     struct lwtunnel_state **ts,
> +			     struct netlink_ext_ack *extack)
> +{
> +	struct nlattr *tb[LWT_XFRM_MAX + 1];
> +	struct lwtunnel_state *new_state;
> +	struct xfrm_md_info *info;
> +	int ret;
> +
> +	ret = nla_parse_nested(tb, LWT_XFRM_MAX, nla, xfrm_lwt_policy, extack);
> +	if (ret < 0)
> +		return ret;
> +
> +	if (!tb[LWT_XFRM_IF_ID])
> +		return -EINVAL;
It would be nice  to add extack error message for all error cases, particularly
for EINVAL ;-)

> +
> +	new_state = lwtunnel_state_alloc(sizeof(*info));
> +	if (!new_state)
> +		return -ENOMEM;
> +
> +	new_state->type = LWTUNNEL_ENCAP_XFRM;
> +
> +	info = lwt_xfrm_info(new_state);
> +
> +	info->if_id = nla_get_u32(tb[LWT_XFRM_IF_ID]);
> +	if (!info->if_id) {
> +		ret = -EINVAL;
> +		goto errout;
> +	}
> +
> +	if (tb[LWT_XFRM_LINK]) {
> +		info->link = nla_get_u32(tb[LWT_XFRM_LINK]);
> +		if (!info->link) {
> +			ret = -EINVAL;
> +			goto errout;
> +		}
> +	}
> +
> +	*ts = new_state;
> +	return 0;
> +
> +errout:
> +	xfrmi_destroy_state(new_state);
> +	kfree(new_state);
> +	return ret;
> +}