From: David Ahern <dsa@cumulusnetworks.com>
To: Johannes Berg <johannes@sipsolutions.net>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org
Cc: pablo@netfilter.org, Jamal Hadi Salim <jhs@mojatatu.com>,
Jiri Benc <jbenc@redhat.com>,
jiri@resnulli.us, Johannes Berg <johannes.berg@intel.com>
Subject: Re: [PATCH 1/5] netlink: extended ACK reporting
Date: Sat, 8 Apr 2017 14:26:18 -0400 [thread overview]
Message-ID: <46f42c2a-db2a-78b5-37c8-0ee5bb0443f8@cumulusnetworks.com> (raw)
In-Reply-To: <20170408174900.12820-2-johannes@sipsolutions.net>
On 4/8/17 1:48 PM, Johannes Berg wrote:
> @@ -2267,21 +2284,37 @@ int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
> }
> EXPORT_SYMBOL(__netlink_dump_start);
>
> -void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
> +void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err,
> + const struct netlink_ext_ack *extack)
> {
> struct sk_buff *skb;
> struct nlmsghdr *rep;
> struct nlmsgerr *errmsg;
> size_t payload = sizeof(*errmsg);
> + size_t acksize = sizeof(*errmsg);
> struct netlink_sock *nlk = nlk_sk(NETLINK_CB(in_skb).sk);
>
> /* Error messages get the original request appened, unless the user
> - * requests to cap the error message.
> + * requests to cap the error message, and get extra error data if
> + * requested.
> */
> - if (!(nlk->flags & NETLINK_F_CAP_ACK) && err)
> - payload += nlmsg_len(nlh);
> + if (err) {
> + if (!(nlk->flags & NETLINK_F_CAP_ACK))
> + payload += nlmsg_len(nlh);
> + acksize = payload;
> + if (nlk->flags & NETLINK_F_EXT_ACK) {
> + if (extack && extack->_msg)
> + acksize +=
> + nla_total_size(strlen(extack->_msg) + 1);
> + if (extack && extack->bad_attr)
> + acksize += nla_total_size(sizeof(u32));
> + if (extack &&
> + (extack->missing_attr || extack->bad_attr))
> + acksize += nla_total_size(sizeof(u16));
If you create a v3, the extack check can by pulled up to the (flags &
NETLINK_F_EXT_ACK) check.
> + }
> + }
>
> - skb = nlmsg_new(payload, GFP_KERNEL);
> + skb = nlmsg_new(acksize, GFP_KERNEL);
> if (!skb) {
> struct sock *sk;
>
> @@ -2300,14 +2333,35 @@ void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
> NLMSG_ERROR, payload, 0);
> errmsg = nlmsg_data(rep);
> errmsg->error = err;
> - memcpy(&errmsg->msg, nlh, payload > sizeof(*errmsg) ? nlh->nlmsg_len : sizeof(*nlh));
> + memcpy(&errmsg->msg, nlh,
> + !(nlk->flags & NETLINK_F_CAP_ACK) ? nlh->nlmsg_len
> + : sizeof(*nlh));
> +
> + if (err && nlk->flags & NETLINK_F_EXT_ACK) {
> + if (extack && extack->_msg)
> + WARN_ON(nla_put_string(skb, NLMSGERR_ATTR_MSG,
> + extack->_msg));
> + if (extack && extack->bad_attr &&
> + !WARN_ON((u8 *)extack->bad_attr < in_skb->data ||
> + (u8 *)extack->bad_attr >= in_skb->data +
> + in_skb->len))
> + WARN_ON(nla_put_u32(skb, NLMSGERR_ATTR_OFFS,
> + (u8 *)extack->bad_attr -
> + in_skb->data));
> + if (extack && extack->missing_attr)
> + WARN_ON(nla_put_u16(skb, NLMSGERR_ATTR_ATTR,
> + extack->missing_attr));
same here
next prev parent reply other threads:[~2017-04-08 18:26 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-08 17:48 [PATCH 0/5] extended netlink ACK reporting Johannes Berg
2017-04-08 17:48 ` [PATCH 1/5] netlink: extended " Johannes Berg
2017-04-08 18:26 ` David Ahern [this message]
2017-04-08 18:34 ` Jiri Pirko
2017-04-08 18:37 ` Johannes Berg
2017-04-08 18:40 ` Jiri Pirko
2017-04-08 20:13 ` Johannes Berg
2017-04-09 17:43 ` David Ahern
2017-04-10 6:18 ` Johannes Berg
2017-04-13 13:27 ` Nicolas Dichtel
2017-04-13 13:29 ` Johannes Berg
2017-04-13 14:05 ` Nicolas Dichtel
2017-04-13 19:24 ` Johannes Berg
2017-04-16 14:40 ` second wave of netlink " Jamal Hadi Salim
2017-04-16 14:45 ` David Ahern
2017-04-16 14:48 ` Jamal Hadi Salim
2017-04-16 14:50 ` David Ahern
2017-04-16 16:55 ` David Ahern
[not found] ` <CAPWQB7FWOcEen3SGyQtW7t2WpDNLE08JEdHeZHmM738J=Rur0g@mail.gmail.com>
2017-04-18 9:41 ` [PATCH 1/5] netlink: " Johannes Berg
2017-04-18 23:46 ` Joe Stringer
2017-04-08 18:36 ` David Ahern
2017-04-08 18:37 ` Johannes Berg
2017-04-08 20:14 ` David Ahern
2017-04-08 17:48 ` [PATCH 2/5] genetlink: pass extended ACK report down Johannes Berg
2017-04-08 17:48 ` [PATCH 3/5] netlink: allow sending extended ACK with cookie on success Johannes Berg
2017-04-08 17:48 ` [PATCH 4/5] netlink: pass extended ACK struct to parsing functions Johannes Berg
2017-04-08 18:50 ` David Ahern
2017-04-08 20:15 ` Johannes Berg
2017-04-08 17:49 ` [PATCH 5/5] netlink: pass extended ACK struct where available Johannes Berg
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