From patchwork Mon Jun 13 03:29:21 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Aring X-Patchwork-Id: 12878965 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 87B4CCCA47C for ; Mon, 13 Jun 2022 03:30:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232854AbiFMD37 (ORCPT ); Sun, 12 Jun 2022 23:29:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53272 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231857AbiFMD36 (ORCPT ); Sun, 12 Jun 2022 23:29:58 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id 5EAAD193CC for ; Sun, 12 Jun 2022 20:29:57 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1655090996; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=aKrLIz2/fH9wSRg7503YdOZi93Zj103cLf7h7Hd63iM=; b=SvjaiO+E3zM20MpT7c2xb8E5RpOBlFsTBd4nMCoLALRPQSL9hzER1x1RvqBeoBZ9xGz2IM ZpaHw8+a0d0+kAiNSvilcz58UjyJ/k0sAT4GVlt7Lj6x6tVOIXxH/YaH5Ia5wYX0ewa3MR LNJZGbFqpXKlusdLAo1o53LbPS8UpWw= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-1-rq6WqYbWN62WxILCcKR50Q-1; Sun, 12 Jun 2022 23:29:53 -0400 X-MC-Unique: rq6WqYbWN62WxILCcKR50Q-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B91E4802804; Mon, 13 Jun 2022 03:29:52 +0000 (UTC) Received: from fs-i40c-03.fs.lab.eng.bos.redhat.com (fs-i40c-03.fs.lab.eng.bos.redhat.com [10.16.224.23]) by smtp.corp.redhat.com (Postfix) with ESMTP id 91D20492C3B; Mon, 13 Jun 2022 03:29:52 +0000 (UTC) From: Alexander Aring To: stefan@datenfreihafen.org Cc: linux-wpan@vger.kernel.org, linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org, aahringo@redhat.com Subject: [PATCH wpan-next 1/2] 6lowpan: nhc: more constify api Date: Sun, 12 Jun 2022 23:29:21 -0400 Message-Id: <20220613032922.1030739-1-aahringo@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.10 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org This patch adds an const to the return of lowpan_nhc_by_nexthdr(), as we never modify nhcs. Signed-off-by: Alexander Aring --- net/6lowpan/nhc.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/6lowpan/nhc.h b/net/6lowpan/nhc.h index ab7b4977c32b..4ba6b2ffcb47 100644 --- a/net/6lowpan/nhc.h +++ b/net/6lowpan/nhc.h @@ -66,6 +66,7 @@ struct lowpan_nhc { int (*uncompress)(struct sk_buff *skb, size_t needed); int (*compress)(struct sk_buff *skb, u8 **hc_ptr); + }; /** @@ -73,7 +74,7 @@ struct lowpan_nhc { * * @nexthdr: ipv6 nexthdr value. */ -struct lowpan_nhc *lowpan_nhc_by_nexthdr(u8 nexthdr); +const struct lowpan_nhc *lowpan_nhc_by_nexthdr(u8 nexthdr); /** * lowpan_nhc_check_compression - checks if we support compression format. If From patchwork Mon Jun 13 03:29:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Aring X-Patchwork-Id: 12878966 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3B759C433EF for ; Mon, 13 Jun 2022 03:30:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232040AbiFMDaH (ORCPT ); Sun, 12 Jun 2022 23:30:07 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53744 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231920AbiFMDaF (ORCPT ); Sun, 12 Jun 2022 23:30:05 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id E7CD02125B for ; Sun, 12 Jun 2022 20:30:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1655090998; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5I2dj+cT/NCOtepo3+g1dbElxr84BofmUvMaWRJaUh0=; b=fULwAz8nnSv5gpdIfVE7LR2D85ezEbyiyc8jxxAlLmr5vnN3ELfz5y0Up570EQdKIVr7Sm NHbvAipumWzzjaaEa3KKm4XPUTfmGA5yGn2p1Si9ptZtm+I7xTey+T7nUaZuCbdw0sre5T O8rSqQw1Kt0f1ZtNMDJ7T2FEwfx54gk= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-184-svD0vTKlMtOGHnns9fA-FA-1; Sun, 12 Jun 2022 23:29:53 -0400 X-MC-Unique: svD0vTKlMtOGHnns9fA-FA-1 Received: from smtp.corp.redhat.com (int-mx10.intmail.prod.int.rdu2.redhat.com [10.11.54.10]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E80E2185A79C; Mon, 13 Jun 2022 03:29:52 +0000 (UTC) Received: from fs-i40c-03.fs.lab.eng.bos.redhat.com (fs-i40c-03.fs.lab.eng.bos.redhat.com [10.16.224.23]) by smtp.corp.redhat.com (Postfix) with ESMTP id C0E00492C3B; Mon, 13 Jun 2022 03:29:52 +0000 (UTC) From: Alexander Aring To: stefan@datenfreihafen.org Cc: linux-wpan@vger.kernel.org, linux-bluetooth@vger.kernel.org, netdev@vger.kernel.org, aahringo@redhat.com Subject: [PATCH wpan-next 2/2] 6lowpan: nhc: drop EEXIST limitation Date: Sun, 12 Jun 2022 23:29:22 -0400 Message-Id: <20220613032922.1030739-2-aahringo@redhat.com> In-Reply-To: <20220613032922.1030739-1-aahringo@redhat.com> References: <20220613032922.1030739-1-aahringo@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.10 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org In nhc we have compression() and uncompression(). Currently we have a limitation that we return -EEXIST when it's the nhc is already registered according the nexthdr. But on receiving handling and the nhcid we can indeed support both at the same time. We remove the current static array implementation and replace it by a dynamic list handling to get rid of this limitation. Signed-off-by: Alexander Aring --- net/6lowpan/nhc.c | 69 ++++++++++++++++++++++++++++++----------------- 1 file changed, 44 insertions(+), 25 deletions(-) diff --git a/net/6lowpan/nhc.c b/net/6lowpan/nhc.c index 7b374595328d..3d7c50139142 100644 --- a/net/6lowpan/nhc.c +++ b/net/6lowpan/nhc.c @@ -12,13 +12,30 @@ #include "nhc.h" -static const struct lowpan_nhc *lowpan_nexthdr_nhcs[NEXTHDR_MAX + 1]; +struct lowpan_nhc_entry { + const struct lowpan_nhc *nhc; + struct list_head list; +}; + static DEFINE_SPINLOCK(lowpan_nhc_lock); +static LIST_HEAD(lowpan_nexthdr_nhcs); + +const struct lowpan_nhc *lowpan_nhc_by_nexthdr(u8 nexthdr) +{ + const struct lowpan_nhc_entry *e; + + list_for_each_entry(e, &lowpan_nexthdr_nhcs, list) { + if (e->nhc->nexthdr == nexthdr && + e->nhc->compress) + return e->nhc; + } + + return NULL; +} static const struct lowpan_nhc *lowpan_nhc_by_nhcid(struct sk_buff *skb) { - const struct lowpan_nhc *nhc; - int i; + const struct lowpan_nhc_entry *e; u8 id; if (!pskb_may_pull(skb, 1)) @@ -26,13 +43,9 @@ static const struct lowpan_nhc *lowpan_nhc_by_nhcid(struct sk_buff *skb) id = *skb->data; - for (i = 0; i < NEXTHDR_MAX + 1; i++) { - nhc = lowpan_nexthdr_nhcs[i]; - if (!nhc) - continue; - - if ((id & nhc->idmask) == nhc->id) - return nhc; + list_for_each_entry(e, &lowpan_nexthdr_nhcs, list) { + if ((id & e->nhc->idmask) == e->nhc->id) + return e->nhc; } return NULL; @@ -46,8 +59,8 @@ int lowpan_nhc_check_compression(struct sk_buff *skb, spin_lock_bh(&lowpan_nhc_lock); - nhc = lowpan_nexthdr_nhcs[hdr->nexthdr]; - if (!(nhc && nhc->compress)) + nhc = lowpan_nhc_by_nexthdr(hdr->nexthdr); + if (!nhc) ret = -ENOENT; spin_unlock_bh(&lowpan_nhc_lock); @@ -63,7 +76,7 @@ int lowpan_nhc_do_compression(struct sk_buff *skb, const struct ipv6hdr *hdr, spin_lock_bh(&lowpan_nhc_lock); - nhc = lowpan_nexthdr_nhcs[hdr->nexthdr]; + nhc = lowpan_nhc_by_nexthdr(hdr->nexthdr); /* check if the nhc module was removed in unlocked part. * TODO: this is a workaround we should prevent unloading * of nhc modules while unlocked part, this will always drop @@ -140,28 +153,34 @@ int lowpan_nhc_do_uncompression(struct sk_buff *skb, int lowpan_nhc_add(const struct lowpan_nhc *nhc) { - int ret = 0; + struct lowpan_nhc_entry *e; - spin_lock_bh(&lowpan_nhc_lock); + e = kmalloc(sizeof(*e), GFP_KERNEL); + if (!e) + return -ENOMEM; - if (lowpan_nexthdr_nhcs[nhc->nexthdr]) { - ret = -EEXIST; - goto out; - } + e->nhc = nhc; - lowpan_nexthdr_nhcs[nhc->nexthdr] = nhc; -out: + spin_lock_bh(&lowpan_nhc_lock); + list_add(&e->list, &lowpan_nexthdr_nhcs); spin_unlock_bh(&lowpan_nhc_lock); - return ret; + + return 0; } EXPORT_SYMBOL(lowpan_nhc_add); void lowpan_nhc_del(const struct lowpan_nhc *nhc) { - spin_lock_bh(&lowpan_nhc_lock); - - lowpan_nexthdr_nhcs[nhc->nexthdr] = NULL; + struct lowpan_nhc_entry *e, *tmp; + spin_lock_bh(&lowpan_nhc_lock); + list_for_each_entry_safe(e, tmp, &lowpan_nexthdr_nhcs, list) { + if (e->nhc == nhc) { + list_del(&e->list); + kfree(e); + break; + } + } spin_unlock_bh(&lowpan_nhc_lock); synchronize_net();