linux-kernel - [PATCH net-next 01/10] net: introduce CONFIG_NET

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250511004110.145171-2-ebiggers@kernel.org>
Date: Sat, 10 May 2025 17:41:01 -0700
From: Eric Biggers <ebiggers@...nel.org>
To: netdev@...r.kernel.org
Cc: linux-nvme@...ts.infradead.org,
	linux-sctp@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Daniel Borkmann <daniel@...earbox.net>,
	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
	Sagi Grimberg <sagi@...mberg.me>,
	Ard Biesheuvel <ardb@...nel.org>
Subject: [PATCH net-next 01/10] net: introduce CONFIG_NET_CRC32C

From: Eric Biggers <ebiggers@...gle.com>

Add a hidden kconfig symbol NET_CRC32C that will group together the
functions that calculate CRC32C checksums of packets, so that these
don't have to be built into NET-enabled kernels that don't need them.

Make skb_crc32c_csum_help() (which is called only when IP_SCTP is
enabled) conditional on this symbol, and make IP_SCTP select it.

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 net/Kconfig      | 4 ++++
 net/core/dev.c   | 2 ++
 net/sctp/Kconfig | 1 +
 3 files changed, 7 insertions(+)

diff --git a/net/Kconfig b/net/Kconfig
index 202cc595e5e6..5b71a52987d3 100644
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -73,10 +73,14 @@ config NET_DEVMEM
 	depends on PAGE_POOL
 
 config NET_SHAPER
 	bool
 
+config NET_CRC32C
+	bool
+	select CRC32
+
 menu "Networking options"
 
 source "net/packet/Kconfig"
 source "net/unix/Kconfig"
 source "net/tls/Kconfig"
diff --git a/net/core/dev.c b/net/core/dev.c
index c9013632296f..51606b2d17bb 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3592,10 +3592,11 @@ int skb_checksum_help(struct sk_buff *skb)
 out:
 	return ret;
 }
 EXPORT_SYMBOL(skb_checksum_help);
 
+#ifdef CONFIG_NET_CRC32C
 int skb_crc32c_csum_help(struct sk_buff *skb)
 {
 	__le32 crc32c_csum;
 	int ret = 0, offset, start;
 
@@ -3631,10 +3632,11 @@ int skb_crc32c_csum_help(struct sk_buff *skb)
 	skb_reset_csum_not_inet(skb);
 out:
 	return ret;
 }
 EXPORT_SYMBOL(skb_crc32c_csum_help);
+#endif /* CONFIG_NET_CRC32C */
 
 __be16 skb_network_protocol(struct sk_buff *skb, int *depth)
 {
 	__be16 type = skb->protocol;
 
diff --git a/net/sctp/Kconfig b/net/sctp/Kconfig
index d18a72df3654..3669ba351856 100644
--- a/net/sctp/Kconfig
+++ b/net/sctp/Kconfig
@@ -9,10 +9,11 @@ menuconfig IP_SCTP
 	depends on IPV6 || IPV6=n
 	select CRC32
 	select CRYPTO
 	select CRYPTO_HMAC
 	select CRYPTO_SHA1
+	select NET_CRC32C
 	select NET_UDP_TUNNEL
 	help
 	  Stream Control Transmission Protocol
 
 	  From RFC 2960 <http://www.ietf.org/rfc/rfc2960.txt>.

base-commit: 0b28182c73a3d013bcabbb890dc1070a8388f55a
-- 
2.49.0