linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Dmitry Safonov <0x7f454c46@gmail.com>
To: Leonard Crestez <cdleonard@gmail.com>,
	David Ahern <dsahern@kernel.org>,
	Eric Dumazet <edumazet@google.com>
Cc: "David S. Miller" <davem@davemloft.net>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Kuniyuki Iwashima <kuniyu@amazon.co.jp>,
	Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
	Jakub Kicinski <kuba@kernel.org>,
	Yuchung Cheng <ycheng@google.com>,
	Francesco Ruggeri <fruggeri@arista.com>,
	Mat Martineau <mathew.j.martineau@linux.intel.com>,
	Christoph Paasch <cpaasch@apple.com>,
	Ivan Delalande <colona@arista.com>,
	Priyaranjan Jha <priyarjha@google.com>,
	netdev@vger.kernel.org, linux-crypto@vger.kernel.org,
	linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
	Shuah Khan <shuah@kernel.org>
Subject: Re: [PATCH v2 06/25] tcp: authopt: Compute packet signatures
Date: Fri, 5 Nov 2021 01:53:31 +0000	[thread overview]
Message-ID: <816d5018-6cc5-78c4-4c13-f92927ad23f7@gmail.com> (raw)
In-Reply-To: <5245f35901015acc6a41d1da92deb96f3e593b7c.1635784253.git.cdleonard@gmail.com>

On 11/1/21 16:34, Leonard Crestez wrote:
[..]
> +static int skb_shash_frags(struct shash_desc *desc,
> +			   struct sk_buff *skb)
> +{
> +	struct sk_buff *frag_iter;
> +	int err, i;
> +
> +	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
> +		skb_frag_t *f = &skb_shinfo(skb)->frags[i];
> +		u32 p_off, p_len, copied;
> +		struct page *p;
> +		u8 *vaddr;
> +
> +		skb_frag_foreach_page(f, skb_frag_off(f), skb_frag_size(f),
> +				      p, p_off, p_len, copied) {
> +			vaddr = kmap_atomic(p);
> +			err = crypto_shash_update(desc, vaddr + p_off, p_len);
> +			kunmap_atomic(vaddr);
> +			if (err)
> +				return err;
> +		}
> +	}
> +
> +	skb_walk_frags(skb, frag_iter) {
> +		err = skb_shash_frags(desc, frag_iter);
> +		if (err)
> +			return err;
> +	}
> +
> +	return 0;
> +}

This seems quite sub-optimal: IIUC, shash should only be used for small
amount of hashing. That's why tcp-md5 uses ahash with scatterlists.
Which drives me to the question: why not reuse tcp_md5sig_pool code?

And it seems that you can avoid TCP_AUTHOPT_ALG_* enum and just supply
to crypto the string from socket option (like xfrm does).

Here is my idea:
https://lore.kernel.org/all/20211105014953.972946-6-dima@arista.com/T/#u

Thanks,
          Dmitry

  reply	other threads:[~2021-11-05  1:53 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-01 16:34 [PATCH v2] tcp: Initial support for RFC5925 auth option Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 01/25] tcp: authopt: Initial support and key management Leonard Crestez
2021-11-03  2:29   ` David Ahern
2021-11-05 12:10     ` Leonard Crestez
2021-11-05  1:22   ` Dmitry Safonov
2021-11-05  7:04     ` Leonard Crestez
2021-11-05 14:50       ` Dmitry Safonov
2021-11-05 18:00         ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 02/25] docs: Add user documentation for tcp_authopt Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 03/25] selftests: Initial tcp_authopt test module Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 04/25] selftests: tcp_authopt: Initial sockopt manipulation Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 05/25] tcp: authopt: Add crypto initialization Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 06/25] tcp: authopt: Compute packet signatures Leonard Crestez
2021-11-05  1:53   ` Dmitry Safonov [this message]
2021-11-05  6:39     ` Leonard Crestez
2021-11-05  2:08   ` Dmitry Safonov
2021-11-05  6:09     ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 07/25] tcp: Use BIT() for OPTION_* constants Leonard Crestez
2021-11-03  2:31   ` David Ahern
2021-11-03 22:19     ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 08/25] tcp: authopt: Hook into tcp core Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 09/25] tcp: authopt: Disable via sysctl by default Leonard Crestez
2021-11-03  2:39   ` David Ahern
2021-11-05  8:50     ` Leonard Crestez
2021-11-05  1:46   ` Dmitry Safonov
2021-11-01 16:34 ` [PATCH v2 10/25] selftests: tcp_authopt: Test key address binding Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 11/25] tcp: authopt: Implement Sequence Number Extension Leonard Crestez
2021-11-01 19:22   ` Francesco Ruggeri
2021-11-02 10:03     ` Leonard Crestez
2021-11-02 19:21       ` Francesco Ruggeri
2021-11-03 22:01         ` Leonard Crestez
2021-11-01 20:54   ` Eric Dumazet
2021-11-02  9:50     ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 12/25] tcp: ipv6: Add AO signing for tcp_v6_send_response Leonard Crestez
2021-11-03  2:44   ` David Ahern
2021-11-03 22:09     ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 13/25] tcp: authopt: Add support for signing skb-less replies Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 14/25] tcp: ipv4: Add AO signing for " Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 15/25] selftests: tcp_authopt: Implement SNE in python Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 16/25] selftests: tcp_authopt: Add scapy-based packet signing code Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 17/25] selftests: tcp_authopt: Add packet-level tests Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 18/25] selftests: tcp_authopt: Initial sne test Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 19/25] tcp: authopt: Add key selection controls Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 20/25] selftests: tcp_authopt: Add tests for rollover Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 21/25] tcp: authopt: Add initial l3index support Leonard Crestez
2021-11-03  3:06   ` David Ahern
2021-11-05 12:26     ` Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 22/25] selftests: tcp_authopt: Initial tests for l3mdev handling Leonard Crestez
2021-11-01 16:34 ` [PATCH v2 23/25] selftests: nettest: Rename md5_prefix to key_addr_prefix Leonard Crestez
2021-11-03  3:08   ` David Ahern
2021-11-01 16:34 ` [PATCH v2 24/25] selftests: nettest: Initial tcp_authopt support Leonard Crestez
2021-11-03  3:09   ` David Ahern
2021-11-01 16:35 ` [PATCH v2 25/25] selftests: net/fcnal: " Leonard Crestez
2021-11-03  3:18 ` [PATCH v2] tcp: Initial support for RFC5925 auth option David Ahern
2021-11-03 22:22   ` Leonard Crestez

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=816d5018-6cc5-78c4-4c13-f92927ad23f7@gmail.com \
    --to=0x7f454c46@gmail.com \
    --cc=cdleonard@gmail.com \
    --cc=colona@arista.com \
    --cc=cpaasch@apple.com \
    --cc=davem@davemloft.net \
    --cc=dsahern@kernel.org \
    --cc=edumazet@google.com \
    --cc=fruggeri@arista.com \
    --cc=herbert@gondor.apana.org.au \
    --cc=kuba@kernel.org \
    --cc=kuniyu@amazon.co.jp \
    --cc=linux-crypto@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-kselftest@vger.kernel.org \
    --cc=mathew.j.martineau@linux.intel.com \
    --cc=netdev@vger.kernel.org \
    --cc=priyarjha@google.com \
    --cc=shuah@kernel.org \
    --cc=ycheng@google.com \
    --cc=yoshfuji@linux-ipv6.org \
    /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).