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Message-ID: <20240307093530.GI281974@kernel.org>
Date: Thu, 7 Mar 2024 09:35:30 +0000
From: Simon Horman <horms@...nel.org>
To: Eric Dumazet <edumazet@...gle.com>
Cc: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
netdev@...r.kernel.org, eric.dumazet@...il.com,
Ido Schimmel <idosch@...dia.com>, David Ahern <dsahern@...nel.org>
Subject: Re: [PATCH net-next] netlink: let core handle error cases in dump
operations
+ Ido Schimmel, David Ahern
On Wed, Mar 06, 2024 at 10:24:26AM +0000, Eric Dumazet wrote:
> After commit b5a899154aa9 ("netlink: handle EMSGSIZE errors
> in the core"), we can remove some code that was not 100 % correct
> anyway.
>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Thanks Eric,
this looks like a nice clean-up in combination with the cited commit.
Reviewed-by: Simon Horman <horms@...nel.org>
> ---
> net/core/rtnetlink.c | 5 +----
> net/ipv4/devinet.c | 4 ----
> net/ipv4/fib_frontend.c | 7 +------
> net/ipv6/addrconf.c | 7 +------
> 4 files changed, 3 insertions(+), 20 deletions(-)
>
> diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
> index 780b330f8ef9fa4881b9d51570d1a65f5171ee5d..7eac6765df098fd685937ace63dfb5add9c77731 100644
> --- a/net/core/rtnetlink.c
> +++ b/net/core/rtnetlink.c
> @@ -2267,11 +2267,8 @@ static int rtnl_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
> nlh->nlmsg_seq, 0, flags,
> ext_filter_mask, 0, NULL, 0,
> netnsid, GFP_KERNEL);
> - if (err < 0) {
> - if (likely(skb->len))
> - err = skb->len;
> + if (err < 0)
> break;
> - }
> }
> cb->seq = tgt_net->dev_base_seq;
> nl_dump_check_consistent(cb, nlmsg_hdr(skb));
> diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
> index 4daa8124f247c256c4f8c1ff29ac621570af0755..7a437f0d41905e6acfdc35743afba3a7abfd0dd5 100644
> --- a/net/ipv4/devinet.c
> +++ b/net/ipv4/devinet.c
> @@ -1900,8 +1900,6 @@ static int inet_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
> goto done;
> }
> done:
> - if (err < 0 && likely(skb->len))
> - err = skb->len;
> if (fillargs.netnsid >= 0)
> put_net(tgt_net);
> rcu_read_unlock();
> @@ -2312,8 +2310,6 @@ static int inet_netconf_dump_devconf(struct sk_buff *skb,
> ctx->all_default++;
> }
> done:
> - if (err < 0 && likely(skb->len))
> - err = skb->len;
> rcu_read_unlock();
> return err;
> }
> diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c
> index bf3a2214fe29b6f9b494581b293259e6c5ce6f8c..48741352a88a72e0232977cc9f2cf172f45df89b 100644
> --- a/net/ipv4/fib_frontend.c
> +++ b/net/ipv4/fib_frontend.c
> @@ -1026,8 +1026,6 @@ static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
> goto unlock;
> }
> err = fib_table_dump(tb, skb, cb, &filter);
> - if (err < 0 && skb->len)
> - err = skb->len;
> goto unlock;
> }
>
> @@ -1045,11 +1043,8 @@ static int inet_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
> memset(&cb->args[2], 0, sizeof(cb->args) -
> 2 * sizeof(cb->args[0]));
> err = fib_table_dump(tb, skb, cb, &filter);
> - if (err < 0) {
> - if (likely(skb->len))
> - err = skb->len;
> + if (err < 0)
> goto out;
> - }
> dumped = 1;
> next:
> e++;
> diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
> index 2f84e6ecf19f48602cadb47bc378c9b5a1cdbf65..f786b65d12e43c53ed36535880f6e6d35879a44e 100644
> --- a/net/ipv6/addrconf.c
> +++ b/net/ipv6/addrconf.c
> @@ -793,8 +793,6 @@ static int inet6_netconf_dump_devconf(struct sk_buff *skb,
> ctx->all_default++;
> }
> done:
> - if (err < 0 && likely(skb->len))
> - err = skb->len;
> rcu_read_unlock();
> return err;
> }
> @@ -6158,11 +6156,8 @@ static int inet6_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
> NETLINK_CB(cb->skb).portid,
> cb->nlh->nlmsg_seq,
> RTM_NEWLINK, NLM_F_MULTI);
> - if (err < 0) {
> - if (likely(skb->len))
> - err = skb->len;
> + if (err < 0)
> break;
> - }
> }
> rcu_read_unlock();
>
> --
> 2.44.0.278.ge034bb2e1d-goog
>
>
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