From: David Ahern <dsahern@gmail.com>
To: Daniel Borkmann <daniel@iogearbox.net>,
davem@davemloft.net, kuba@kernel.org
Cc: roopa@nvidia.com, dsahern@kernel.org, m@lambda.lt,
john.fastabend@gmail.com, netdev@vger.kernel.org,
bpf@vger.kernel.org
Subject: Re: [PATCH net-next 3/4] net, neigh: Extend neigh->flags to 32 bit to allow for extensions
Date: Tue, 12 Oct 2021 08:31:33 -0600 [thread overview]
Message-ID: <018673d2-6745-47ef-6586-53ddf8aed9b2@gmail.com> (raw)
In-Reply-To: <20211011121238.25542-4-daniel@iogearbox.net>
On 10/11/21 6:12 AM, Daniel Borkmann wrote:
> diff --git a/include/net/neighbour.h b/include/net/neighbour.h
> index eb2a7c03a5b0..26d4ada0aea9 100644
> --- a/include/net/neighbour.h
> +++ b/include/net/neighbour.h
> @@ -144,11 +144,11 @@ struct neighbour {
> struct timer_list timer;
> unsigned long used;
> atomic_t probes;
> - __u8 flags;
> - __u8 nud_state;
> - __u8 type;
> - __u8 dead;
> + u8 nud_state;
> + u8 type;
> + u8 dead;
> u8 protocol;
> + u32 flags;
> seqlock_t ha_lock;
> unsigned char ha[ALIGN(MAX_ADDR_LEN, sizeof(unsigned long))] __aligned(8);
> struct hh_cache hh;
> @@ -172,7 +172,7 @@ struct pneigh_entry {
> struct pneigh_entry *next;
> possible_net_t net;
> struct net_device *dev;
> - u8 flags;
> + u32 flags;
> u8 protocol;
> u8 key[];
> };
> @@ -258,6 +258,10 @@ static inline void *neighbour_priv(const struct neighbour *n)
> #define NEIGH_UPDATE_F_ISROUTER 0x40000000
> #define NEIGH_UPDATE_F_ADMIN 0x80000000
>
> +/* In-kernel representation for NDA_FLAGS_EXT flags: */
> +#define NTF_OLD_MASK 0xff
> +#define NTF_EXT_SHIFT 8
so only 24 EXT flags can be added. That should be documented; far off
today, but that's an easy overflow to miss.
Reviewed-by: David Ahern <dsahern@kernel.org>
next prev parent reply other threads:[~2021-10-12 14:31 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-11 12:12 [PATCH net-next 0/4] Managed Neighbor Entries Daniel Borkmann
2021-10-11 12:12 ` [PATCH net-next 1/4] net, neigh: Fix NTF_EXT_LEARNED in combination with NTF_USE Daniel Borkmann
2021-10-12 14:23 ` David Ahern
2021-10-11 12:12 ` [PATCH net-next 2/4] net, neigh: Enable state migration between NUD_PERMANENT and NTF_USE Daniel Borkmann
2021-10-12 14:25 ` David Ahern
2021-10-11 12:12 ` [PATCH net-next 3/4] net, neigh: Extend neigh->flags to 32 bit to allow for extensions Daniel Borkmann
2021-10-12 14:31 ` David Ahern [this message]
2021-10-12 14:46 ` Daniel Borkmann
2021-10-12 21:46 ` Jakub Kicinski
2021-10-11 12:12 ` [PATCH net-next 4/4] net, neigh: Add NTF_MANAGED flag for managed neighbor entries Daniel Borkmann
2021-10-12 14:51 ` David Ahern
2021-10-12 15:05 ` Daniel Borkmann
2021-10-12 15:26 ` Daniel Borkmann
2021-10-12 16:31 ` Ido Schimmel
2021-10-13 9:26 ` Daniel Borkmann
2021-10-13 9:59 ` Ido Schimmel
2021-10-13 11:23 ` Daniel Borkmann
2021-10-13 14:10 ` David Ahern
2022-01-31 20:43 ` Eric Dumazet
2022-01-31 21:17 ` Daniel Borkmann
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=018673d2-6745-47ef-6586-53ddf8aed9b2@gmail.com \
--to=dsahern@gmail.com \
--cc=bpf@vger.kernel.org \
--cc=daniel@iogearbox.net \
--cc=davem@davemloft.net \
--cc=dsahern@kernel.org \
--cc=john.fastabend@gmail.com \
--cc=kuba@kernel.org \
--cc=m@lambda.lt \
--cc=netdev@vger.kernel.org \
--cc=roopa@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).