diff options
Diffstat (limited to 'target/linux')
12 files changed, 1514 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/080-wireguard-0124-crypto-mips-poly1305-enable-for-all-MIPS-processors.patch b/target/linux/generic/backport-5.4/080-wireguard-0124-crypto-mips-poly1305-enable-for-all-MIPS-processors.patch new file mode 100644 index 0000000000..c0ee841b02 --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0124-crypto-mips-poly1305-enable-for-all-MIPS-processors.patch @@ -0,0 +1,60 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: "Maciej W. Rozycki" <macro@orcam.me.uk> +Date: Thu, 11 Mar 2021 21:50:47 -0700 +Subject: [PATCH] crypto: mips/poly1305 - enable for all MIPS processors + +commit 6c810cf20feef0d4338e9b424ab7f2644a8b353e upstream. + +The MIPS Poly1305 implementation is generic MIPS code written such as to +support down to the original MIPS I and MIPS III ISA for the 32-bit and +64-bit variant respectively. Lift the current limitation then to enable +code for MIPSr1 ISA or newer processors only and have it available for +all MIPS processors. + +Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk> +Fixes: a11d055e7a64 ("crypto: mips/poly1305 - incorporate OpenSSL/CRYPTOGAMS optimized implementation") +Cc: stable@vger.kernel.org # v5.5+ +Acked-by: Jason A. Donenfeld <Jason@zx2c4.com> +Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + arch/mips/crypto/Makefile | 4 ++-- + crypto/Kconfig | 2 +- + drivers/net/Kconfig | 2 +- + 3 files changed, 4 insertions(+), 4 deletions(-) + +--- a/arch/mips/crypto/Makefile ++++ b/arch/mips/crypto/Makefile +@@ -12,8 +12,8 @@ AFLAGS_chacha-core.o += -O2 # needed to + obj-$(CONFIG_CRYPTO_POLY1305_MIPS) += poly1305-mips.o + poly1305-mips-y := poly1305-core.o poly1305-glue.o + +-perlasm-flavour-$(CONFIG_CPU_MIPS32) := o32 +-perlasm-flavour-$(CONFIG_CPU_MIPS64) := 64 ++perlasm-flavour-$(CONFIG_32BIT) := o32 ++perlasm-flavour-$(CONFIG_64BIT) := 64 + + quiet_cmd_perlasm = PERLASM $@ + cmd_perlasm = $(PERL) $(<) $(perlasm-flavour-y) $(@) +--- a/crypto/Kconfig ++++ b/crypto/Kconfig +@@ -740,7 +740,7 @@ config CRYPTO_POLY1305_X86_64 + + config CRYPTO_POLY1305_MIPS + tristate "Poly1305 authenticator algorithm (MIPS optimized)" +- depends on CPU_MIPS32 || (CPU_MIPS64 && 64BIT) ++ depends on MIPS + select CRYPTO_ARCH_HAVE_LIB_POLY1305 + + config CRYPTO_MD4 +--- a/drivers/net/Kconfig ++++ b/drivers/net/Kconfig +@@ -92,7 +92,7 @@ config WIREGUARD + select CRYPTO_POLY1305_ARM if ARM + select CRYPTO_CURVE25519_NEON if ARM && KERNEL_MODE_NEON + select CRYPTO_CHACHA_MIPS if CPU_MIPS32_R2 +- select CRYPTO_POLY1305_MIPS if CPU_MIPS32 || (CPU_MIPS64 && 64BIT) ++ select CRYPTO_POLY1305_MIPS if MIPS + help + WireGuard is a secure, fast, and easy to use replacement for IPSec + that uses modern cryptography and clever networking tricks. It's diff --git a/target/linux/generic/backport-5.4/080-wireguard-0125-crypto-mips-add-poly1305-core.S-to-.gitignore.patch b/target/linux/generic/backport-5.4/080-wireguard-0125-crypto-mips-add-poly1305-core.S-to-.gitignore.patch new file mode 100644 index 0000000000..856d67d5b8 --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0125-crypto-mips-add-poly1305-core.S-to-.gitignore.patch @@ -0,0 +1,24 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com> +Date: Sat, 27 Mar 2021 19:39:43 -0700 +Subject: [PATCH] crypto: mips: add poly1305-core.S to .gitignore + +commit dc92d0df51dc61de88bf6f4884a17bf73d5c6326 upstream. + +poly1305-core.S is an auto-generated file, so it should be ignored. + +Fixes: a11d055e7a64 ("crypto: mips/poly1305 - incorporate OpenSSL/CRYPTOGAMS optimized implementation") +Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com> +Cc: Ard Biesheuvel <ardb@kernel.org> +Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + arch/mips/crypto/.gitignore | 2 ++ + 1 file changed, 2 insertions(+) + create mode 100644 arch/mips/crypto/.gitignore + +--- /dev/null ++++ b/arch/mips/crypto/.gitignore +@@ -0,0 +1,2 @@ ++# SPDX-License-Identifier: GPL-2.0-only ++poly1305-core.S diff --git a/target/linux/generic/backport-5.4/080-wireguard-0126-crypto-poly1305-fix-poly1305_core_setkey-declaration.patch b/target/linux/generic/backport-5.4/080-wireguard-0126-crypto-poly1305-fix-poly1305_core_setkey-declaration.patch new file mode 100644 index 0000000000..ded6625aeb --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0126-crypto-poly1305-fix-poly1305_core_setkey-declaration.patch @@ -0,0 +1,172 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Arnd Bergmann <arnd@arndb.de> +Date: Mon, 22 Mar 2021 18:05:15 +0100 +Subject: [PATCH] crypto: poly1305 - fix poly1305_core_setkey() declaration +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +commit 8d195e7a8ada68928f2aedb2c18302a4518fe68e upstream. + +gcc-11 points out a mismatch between the declaration and the definition +of poly1305_core_setkey(): + +lib/crypto/poly1305-donna32.c:13:67: error: argument 2 of type ‘const u8[16]’ {aka ‘const unsigned char[16]’} with mismatched bound [-Werror=array-parameter=] + 13 | void poly1305_core_setkey(struct poly1305_core_key *key, const u8 raw_key[16]) + | ~~~~~~~~~^~~~~~~~~~~ +In file included from lib/crypto/poly1305-donna32.c:11: +include/crypto/internal/poly1305.h:21:68: note: previously declared as ‘const u8 *’ {aka ‘const unsigned char *’} + 21 | void poly1305_core_setkey(struct poly1305_core_key *key, const u8 *raw_key); + +This is harmless in principle, as the calling conventions are the same, +but the more specific prototype allows better type checking in the +caller. + +Change the declaration to match the actual function definition. +The poly1305_simd_init() is a bit suspicious here, as it previously +had a 32-byte argument type, but looks like it needs to take the +16-byte POLY1305_BLOCK_SIZE array instead. + +Fixes: 1c08a104360f ("crypto: poly1305 - add new 32 and 64-bit generic versions") +Signed-off-by: Arnd Bergmann <arnd@arndb.de> +Reviewed-by: Ard Biesheuvel <ardb@kernel.org> +Reviewed-by: Eric Biggers <ebiggers@google.com> +Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + arch/arm/crypto/poly1305-glue.c | 2 +- + arch/arm64/crypto/poly1305-glue.c | 2 +- + arch/mips/crypto/poly1305-glue.c | 2 +- + arch/x86/crypto/poly1305_glue.c | 6 +++--- + include/crypto/internal/poly1305.h | 3 ++- + include/crypto/poly1305.h | 6 ++++-- + lib/crypto/poly1305-donna32.c | 3 ++- + lib/crypto/poly1305-donna64.c | 3 ++- + lib/crypto/poly1305.c | 3 ++- + 9 files changed, 18 insertions(+), 12 deletions(-) + +--- a/arch/arm/crypto/poly1305-glue.c ++++ b/arch/arm/crypto/poly1305-glue.c +@@ -29,7 +29,7 @@ void __weak poly1305_blocks_neon(void *s + + static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon); + +-void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 *key) ++void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 key[POLY1305_KEY_SIZE]) + { + poly1305_init_arm(&dctx->h, key); + dctx->s[0] = get_unaligned_le32(key + 16); +--- a/arch/arm64/crypto/poly1305-glue.c ++++ b/arch/arm64/crypto/poly1305-glue.c +@@ -25,7 +25,7 @@ asmlinkage void poly1305_emit(void *stat + + static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon); + +-void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 *key) ++void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 key[POLY1305_KEY_SIZE]) + { + poly1305_init_arm64(&dctx->h, key); + dctx->s[0] = get_unaligned_le32(key + 16); +--- a/arch/mips/crypto/poly1305-glue.c ++++ b/arch/mips/crypto/poly1305-glue.c +@@ -17,7 +17,7 @@ asmlinkage void poly1305_init_mips(void + asmlinkage void poly1305_blocks_mips(void *state, const u8 *src, u32 len, u32 hibit); + asmlinkage void poly1305_emit_mips(void *state, u8 *digest, const u32 *nonce); + +-void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 *key) ++void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 key[POLY1305_KEY_SIZE]) + { + poly1305_init_mips(&dctx->h, key); + dctx->s[0] = get_unaligned_le32(key + 16); +--- a/arch/x86/crypto/poly1305_glue.c ++++ b/arch/x86/crypto/poly1305_glue.c +@@ -15,7 +15,7 @@ + #include <asm/simd.h> + + asmlinkage void poly1305_init_x86_64(void *ctx, +- const u8 key[POLY1305_KEY_SIZE]); ++ const u8 key[POLY1305_BLOCK_SIZE]); + asmlinkage void poly1305_blocks_x86_64(void *ctx, const u8 *inp, + const size_t len, const u32 padbit); + asmlinkage void poly1305_emit_x86_64(void *ctx, u8 mac[POLY1305_DIGEST_SIZE], +@@ -80,7 +80,7 @@ static void convert_to_base2_64(void *ct + state->is_base2_26 = 0; + } + +-static void poly1305_simd_init(void *ctx, const u8 key[POLY1305_KEY_SIZE]) ++static void poly1305_simd_init(void *ctx, const u8 key[POLY1305_BLOCK_SIZE]) + { + poly1305_init_x86_64(ctx, key); + } +@@ -128,7 +128,7 @@ static void poly1305_simd_emit(void *ctx + poly1305_emit_avx(ctx, mac, nonce); + } + +-void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 *key) ++void poly1305_init_arch(struct poly1305_desc_ctx *dctx, const u8 key[POLY1305_KEY_SIZE]) + { + poly1305_simd_init(&dctx->h, key); + dctx->s[0] = get_unaligned_le32(&key[16]); +--- a/include/crypto/internal/poly1305.h ++++ b/include/crypto/internal/poly1305.h +@@ -18,7 +18,8 @@ + * only the ε-almost-∆-universal hash function (not the full MAC) is computed. + */ + +-void poly1305_core_setkey(struct poly1305_core_key *key, const u8 *raw_key); ++void poly1305_core_setkey(struct poly1305_core_key *key, ++ const u8 raw_key[POLY1305_BLOCK_SIZE]); + static inline void poly1305_core_init(struct poly1305_state *state) + { + *state = (struct poly1305_state){}; +--- a/include/crypto/poly1305.h ++++ b/include/crypto/poly1305.h +@@ -58,8 +58,10 @@ struct poly1305_desc_ctx { + }; + }; + +-void poly1305_init_arch(struct poly1305_desc_ctx *desc, const u8 *key); +-void poly1305_init_generic(struct poly1305_desc_ctx *desc, const u8 *key); ++void poly1305_init_arch(struct poly1305_desc_ctx *desc, ++ const u8 key[POLY1305_KEY_SIZE]); ++void poly1305_init_generic(struct poly1305_desc_ctx *desc, ++ const u8 key[POLY1305_KEY_SIZE]); + + static inline void poly1305_init(struct poly1305_desc_ctx *desc, const u8 *key) + { +--- a/lib/crypto/poly1305-donna32.c ++++ b/lib/crypto/poly1305-donna32.c +@@ -10,7 +10,8 @@ + #include <asm/unaligned.h> + #include <crypto/internal/poly1305.h> + +-void poly1305_core_setkey(struct poly1305_core_key *key, const u8 raw_key[16]) ++void poly1305_core_setkey(struct poly1305_core_key *key, ++ const u8 raw_key[POLY1305_BLOCK_SIZE]) + { + /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */ + key->key.r[0] = (get_unaligned_le32(&raw_key[0])) & 0x3ffffff; +--- a/lib/crypto/poly1305-donna64.c ++++ b/lib/crypto/poly1305-donna64.c +@@ -12,7 +12,8 @@ + + typedef __uint128_t u128; + +-void poly1305_core_setkey(struct poly1305_core_key *key, const u8 raw_key[16]) ++void poly1305_core_setkey(struct poly1305_core_key *key, ++ const u8 raw_key[POLY1305_BLOCK_SIZE]) + { + u64 t0, t1; + +--- a/lib/crypto/poly1305.c ++++ b/lib/crypto/poly1305.c +@@ -12,7 +12,8 @@ + #include <linux/module.h> + #include <asm/unaligned.h> + +-void poly1305_init_generic(struct poly1305_desc_ctx *desc, const u8 *key) ++void poly1305_init_generic(struct poly1305_desc_ctx *desc, ++ const u8 key[POLY1305_KEY_SIZE]) + { + poly1305_core_setkey(&desc->core_r, key); + desc->s[0] = get_unaligned_le32(key + 16); diff --git a/target/linux/generic/backport-5.4/080-wireguard-0127-wireguard-selftests-remove-old-conntrack-kconfig-val.patch b/target/linux/generic/backport-5.4/080-wireguard-0127-wireguard-selftests-remove-old-conntrack-kconfig-val.patch new file mode 100644 index 0000000000..3e7d1a8e02 --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0127-wireguard-selftests-remove-old-conntrack-kconfig-val.patch @@ -0,0 +1,29 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: "Jason A. Donenfeld" <Jason@zx2c4.com> +Date: Fri, 4 Jun 2021 17:17:30 +0200 +Subject: [PATCH] wireguard: selftests: remove old conntrack kconfig value + +commit acf2492b51c9a3c4dfb947f4d3477a86d315150f upstream. + +On recent kernels, this config symbol is no longer used. + +Reported-by: Rui Salvaterra <rsalvaterra@gmail.com> +Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") +Cc: stable@vger.kernel.org +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + tools/testing/selftests/wireguard/qemu/kernel.config | 1 - + 1 file changed, 1 deletion(-) + +--- a/tools/testing/selftests/wireguard/qemu/kernel.config ++++ b/tools/testing/selftests/wireguard/qemu/kernel.config +@@ -19,7 +19,6 @@ CONFIG_NETFILTER_XTABLES=y + CONFIG_NETFILTER_XT_NAT=y + CONFIG_NETFILTER_XT_MATCH_LENGTH=y + CONFIG_NETFILTER_XT_MARK=y +-CONFIG_NF_CONNTRACK_IPV4=y + CONFIG_NF_NAT_IPV4=y + CONFIG_IP_NF_IPTABLES=y + CONFIG_IP_NF_FILTER=y diff --git a/target/linux/generic/backport-5.4/080-wireguard-0128-wireguard-selftests-make-sure-rp_filter-is-disabled-.patch b/target/linux/generic/backport-5.4/080-wireguard-0128-wireguard-selftests-make-sure-rp_filter-is-disabled-.patch new file mode 100644 index 0000000000..22d0f3e32e --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0128-wireguard-selftests-make-sure-rp_filter-is-disabled-.patch @@ -0,0 +1,31 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: "Jason A. Donenfeld" <Jason@zx2c4.com> +Date: Fri, 4 Jun 2021 17:17:31 +0200 +Subject: [PATCH] wireguard: selftests: make sure rp_filter is disabled on + vethc + +commit f8873d11d4121aad35024f9379e431e0c83abead upstream. + +Some distros may enable strict rp_filter by default, which will prevent +vethc from receiving the packets with an unrouteable reverse path address. + +Reported-by: Hangbin Liu <liuhangbin@gmail.com> +Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") +Cc: stable@vger.kernel.org +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + tools/testing/selftests/wireguard/netns.sh | 1 + + 1 file changed, 1 insertion(+) + +--- a/tools/testing/selftests/wireguard/netns.sh ++++ b/tools/testing/selftests/wireguard/netns.sh +@@ -363,6 +363,7 @@ ip1 -6 rule add table main suppress_pref + ip1 -4 route add default dev wg0 table 51820 + ip1 -4 rule add not fwmark 51820 table 51820 + ip1 -4 rule add table main suppress_prefixlength 0 ++n1 bash -c 'printf 0 > /proc/sys/net/ipv4/conf/vethc/rp_filter' + # Flood the pings instead of sending just one, to trigger routing table reference counting bugs. + n1 ping -W 1 -c 100 -f 192.168.99.7 + n1 ping -W 1 -c 100 -f abab::1111 diff --git a/target/linux/generic/backport-5.4/080-wireguard-0129-wireguard-do-not-use-O3.patch b/target/linux/generic/backport-5.4/080-wireguard-0129-wireguard-do-not-use-O3.patch new file mode 100644 index 0000000000..a7890a7384 --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0129-wireguard-do-not-use-O3.patch @@ -0,0 +1,33 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: "Jason A. Donenfeld" <Jason@zx2c4.com> +Date: Fri, 4 Jun 2021 17:17:32 +0200 +Subject: [PATCH] wireguard: do not use -O3 + +commit cc5060ca0285efe2728bced399a1955a7ce808b2 upstream. + +Apparently, various versions of gcc have O3-related miscompiles. Looking +at the difference between -O2 and -O3 for gcc 11 doesn't indicate +miscompiles, but the difference also doesn't seem so significant for +performance that it's worth risking. + +Link: https://lore.kernel.org/lkml/CAHk-=wjuoGyxDhAF8SsrTkN0-YfCx7E6jUN3ikC_tn2AKWTTsA@mail.gmail.com/ +Link: https://lore.kernel.org/lkml/CAHmME9otB5Wwxp7H8bR_i2uH2esEMvoBMC8uEXBMH9p0q1s6Bw@mail.gmail.com/ +Reported-by: Linus Torvalds <torvalds@linux-foundation.org> +Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") +Cc: stable@vger.kernel.org +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + drivers/net/wireguard/Makefile | 3 +-- + 1 file changed, 1 insertion(+), 2 deletions(-) + +--- a/drivers/net/wireguard/Makefile ++++ b/drivers/net/wireguard/Makefile +@@ -1,5 +1,4 @@ +-ccflags-y := -O3 +-ccflags-y += -D'pr_fmt(fmt)=KBUILD_MODNAME ": " fmt' ++ccflags-y := -D'pr_fmt(fmt)=KBUILD_MODNAME ": " fmt' + ccflags-$(CONFIG_WIREGUARD_DEBUG) += -DDEBUG + wireguard-y := main.o + wireguard-y += noise.o diff --git a/target/linux/generic/backport-5.4/080-wireguard-0130-wireguard-use-synchronize_net-rather-than-synchroniz.patch b/target/linux/generic/backport-5.4/080-wireguard-0130-wireguard-use-synchronize_net-rather-than-synchroniz.patch new file mode 100644 index 0000000000..309fe36198 --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0130-wireguard-use-synchronize_net-rather-than-synchroniz.patch @@ -0,0 +1,66 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: "Jason A. Donenfeld" <Jason@zx2c4.com> +Date: Fri, 4 Jun 2021 17:17:33 +0200 +Subject: [PATCH] wireguard: use synchronize_net rather than synchronize_rcu + +commit 24b70eeeb4f46c09487f8155239ebfb1f875774a upstream. + +Many of the synchronization points are sometimes called under the rtnl +lock, which means we should use synchronize_net rather than +synchronize_rcu. Under the hood, this expands to using the expedited +flavor of function in the event that rtnl is held, in order to not stall +other concurrent changes. + +This fixes some very, very long delays when removing multiple peers at +once, which would cause some operations to take several minutes. + +Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") +Cc: stable@vger.kernel.org +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + drivers/net/wireguard/peer.c | 6 +++--- + drivers/net/wireguard/socket.c | 2 +- + 2 files changed, 4 insertions(+), 4 deletions(-) + +--- a/drivers/net/wireguard/peer.c ++++ b/drivers/net/wireguard/peer.c +@@ -88,7 +88,7 @@ static void peer_make_dead(struct wg_pee + /* Mark as dead, so that we don't allow jumping contexts after. */ + WRITE_ONCE(peer->is_dead, true); + +- /* The caller must now synchronize_rcu() for this to take effect. */ ++ /* The caller must now synchronize_net() for this to take effect. */ + } + + static void peer_remove_after_dead(struct wg_peer *peer) +@@ -160,7 +160,7 @@ void wg_peer_remove(struct wg_peer *peer + lockdep_assert_held(&peer->device->device_update_lock); + + peer_make_dead(peer); +- synchronize_rcu(); ++ synchronize_net(); + peer_remove_after_dead(peer); + } + +@@ -178,7 +178,7 @@ void wg_peer_remove_all(struct wg_device + peer_make_dead(peer); + list_add_tail(&peer->peer_list, &dead_peers); + } +- synchronize_rcu(); ++ synchronize_net(); + list_for_each_entry_safe(peer, temp, &dead_peers, peer_list) + peer_remove_after_dead(peer); + } +--- a/drivers/net/wireguard/socket.c ++++ b/drivers/net/wireguard/socket.c +@@ -430,7 +430,7 @@ void wg_socket_reinit(struct wg_device * + if (new4) + wg->incoming_port = ntohs(inet_sk(new4)->inet_sport); + mutex_unlock(&wg->socket_update_lock); +- synchronize_rcu(); ++ synchronize_net(); + sock_free(old4); + sock_free(old6); + } diff --git a/target/linux/generic/backport-5.4/080-wireguard-0131-wireguard-peer-allocate-in-kmem_cache.patch b/target/linux/generic/backport-5.4/080-wireguard-0131-wireguard-peer-allocate-in-kmem_cache.patch new file mode 100644 index 0000000000..32ae327037 --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0131-wireguard-peer-allocate-in-kmem_cache.patch @@ -0,0 +1,125 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: "Jason A. Donenfeld" <Jason@zx2c4.com> +Date: Fri, 4 Jun 2021 17:17:34 +0200 +Subject: [PATCH] wireguard: peer: allocate in kmem_cache + +commit a4e9f8e3287c9eb6bf70df982870980dd3341863 upstream. + +With deployments having upwards of 600k peers now, this somewhat heavy +structure could benefit from more fine-grained allocations. +Specifically, instead of using a 2048-byte slab for a 1544-byte object, +we can now use 1544-byte objects directly, thus saving almost 25% +per-peer, or with 600k peers, that's a savings of 303 MiB. This also +makes wireguard's memory usage more transparent in tools like slabtop +and /proc/slabinfo. + +Fixes: 8b5553ace83c ("wireguard: queueing: get rid of per-peer ring buffers") +Suggested-by: Arnd Bergmann <arnd@arndb.de> +Suggested-by: Matthew Wilcox <willy@infradead.org> +Cc: stable@vger.kernel.org +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + drivers/net/wireguard/main.c | 7 +++++++ + drivers/net/wireguard/peer.c | 21 +++++++++++++++++---- + drivers/net/wireguard/peer.h | 3 +++ + 3 files changed, 27 insertions(+), 4 deletions(-) + +--- a/drivers/net/wireguard/main.c ++++ b/drivers/net/wireguard/main.c +@@ -28,6 +28,10 @@ static int __init mod_init(void) + #endif + wg_noise_init(); + ++ ret = wg_peer_init(); ++ if (ret < 0) ++ goto err_peer; ++ + ret = wg_device_init(); + if (ret < 0) + goto err_device; +@@ -44,6 +48,8 @@ static int __init mod_init(void) + err_netlink: + wg_device_uninit(); + err_device: ++ wg_peer_uninit(); ++err_peer: + return ret; + } + +@@ -51,6 +57,7 @@ static void __exit mod_exit(void) + { + wg_genetlink_uninit(); + wg_device_uninit(); ++ wg_peer_uninit(); + } + + module_init(mod_init); +--- a/drivers/net/wireguard/peer.c ++++ b/drivers/net/wireguard/peer.c +@@ -15,6 +15,7 @@ + #include <linux/rcupdate.h> + #include <linux/list.h> + ++static struct kmem_cache *peer_cache; + static atomic64_t peer_counter = ATOMIC64_INIT(0); + + struct wg_peer *wg_peer_create(struct wg_device *wg, +@@ -29,10 +30,10 @@ struct wg_peer *wg_peer_create(struct wg + if (wg->num_peers >= MAX_PEERS_PER_DEVICE) + return ERR_PTR(ret); + +- peer = kzalloc(sizeof(*peer), GFP_KERNEL); ++ peer = kmem_cache_zalloc(peer_cache, GFP_KERNEL); + if (unlikely(!peer)) + return ERR_PTR(ret); +- if (dst_cache_init(&peer->endpoint_cache, GFP_KERNEL)) ++ if (unlikely(dst_cache_init(&peer->endpoint_cache, GFP_KERNEL))) + goto err; + + peer->device = wg; +@@ -64,7 +65,7 @@ struct wg_peer *wg_peer_create(struct wg + return peer; + + err: +- kfree(peer); ++ kmem_cache_free(peer_cache, peer); + return ERR_PTR(ret); + } + +@@ -193,7 +194,8 @@ static void rcu_release(struct rcu_head + /* The final zeroing takes care of clearing any remaining handshake key + * material and other potentially sensitive information. + */ +- kzfree(peer); ++ memzero_explicit(peer, sizeof(*peer)); ++ kmem_cache_free(peer_cache, peer); + } + + static void kref_release(struct kref *refcount) +@@ -225,3 +227,14 @@ void wg_peer_put(struct wg_peer *peer) + return; + kref_put(&peer->refcount, kref_release); + } ++ ++int __init wg_peer_init(void) ++{ ++ peer_cache = KMEM_CACHE(wg_peer, 0); ++ return peer_cache ? 0 : -ENOMEM; ++} ++ ++void wg_peer_uninit(void) ++{ ++ kmem_cache_destroy(peer_cache); ++} +--- a/drivers/net/wireguard/peer.h ++++ b/drivers/net/wireguard/peer.h +@@ -80,4 +80,7 @@ void wg_peer_put(struct wg_peer *peer); + void wg_peer_remove(struct wg_peer *peer); + void wg_peer_remove_all(struct wg_device *wg); + ++int wg_peer_init(void); ++void wg_peer_uninit(void); ++ + #endif /* _WG_PEER_H */ diff --git a/target/linux/generic/backport-5.4/080-wireguard-0132-wireguard-allowedips-initialize-list-head-in-selftes.patch b/target/linux/generic/backport-5.4/080-wireguard-0132-wireguard-allowedips-initialize-list-head-in-selftes.patch new file mode 100644 index 0000000000..ce4e5dcf50 --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0132-wireguard-allowedips-initialize-list-head-in-selftes.patch @@ -0,0 +1,43 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: "Jason A. Donenfeld" <Jason@zx2c4.com> +Date: Fri, 4 Jun 2021 17:17:35 +0200 +Subject: [PATCH] wireguard: allowedips: initialize list head in selftest + +commit 46cfe8eee285cde465b420637507884551f5d7ca upstream. + +The randomized trie tests weren't initializing the dummy peer list head, +resulting in a NULL pointer dereference when used. Fix this by +initializing it in the randomized trie test, just like we do for the +static unit test. + +While we're at it, all of the other strings like this have the word +"self-test", so add it to the missing place here. + +Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") +Cc: stable@vger.kernel.org +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + drivers/net/wireguard/selftest/allowedips.c | 3 ++- + 1 file changed, 2 insertions(+), 1 deletion(-) + +--- a/drivers/net/wireguard/selftest/allowedips.c ++++ b/drivers/net/wireguard/selftest/allowedips.c +@@ -296,6 +296,7 @@ static __init bool randomized_test(void) + goto free; + } + kref_init(&peers[i]->refcount); ++ INIT_LIST_HEAD(&peers[i]->allowedips_list); + } + + mutex_lock(&mutex); +@@ -333,7 +334,7 @@ static __init bool randomized_test(void) + if (wg_allowedips_insert_v4(&t, + (struct in_addr *)mutated, + cidr, peer, &mutex) < 0) { +- pr_err("allowedips random malloc: FAIL\n"); ++ pr_err("allowedips random self-test malloc: FAIL\n"); + goto free_locked; + } + if (horrible_allowedips_insert_v4(&h, diff --git a/target/linux/generic/backport-5.4/080-wireguard-0133-wireguard-allowedips-remove-nodes-in-O-1.patch b/target/linux/generic/backport-5.4/080-wireguard-0133-wireguard-allowedips-remove-nodes-in-O-1.patch new file mode 100644 index 0000000000..78da24ea46 --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0133-wireguard-allowedips-remove-nodes-in-O-1.patch @@ -0,0 +1,237 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: "Jason A. Donenfeld" <Jason@zx2c4.com> +Date: Fri, 4 Jun 2021 17:17:36 +0200 +Subject: [PATCH] wireguard: allowedips: remove nodes in O(1) + +commit f634f418c227c912e7ea95a3299efdc9b10e4022 upstream. + +Previously, deleting peers would require traversing the entire trie in +order to rebalance nodes and safely free them. This meant that removing +1000 peers from a trie with a half million nodes would take an extremely +long time, during which we're holding the rtnl lock. Large-scale users +were reporting 200ms latencies added to the networking stack as a whole +every time their userspace software would queue up significant removals. +That's a serious situation. + +This commit fixes that by maintaining a double pointer to the parent's +bit pointer for each node, and then using the already existing node list +belonging to each peer to go directly to the node, fix up its pointers, +and free it with RCU. This means removal is O(1) instead of O(n), and we +don't use gobs of stack. + +The removal algorithm has the same downside as the code that it fixes: +it won't collapse needlessly long runs of fillers. We can enhance that +in the future if it ever becomes a problem. This commit documents that +limitation with a TODO comment in code, a small but meaningful +improvement over the prior situation. + +Currently the biggest flaw, which the next commit addresses, is that +because this increases the node size on 64-bit machines from 60 bytes to +68 bytes. 60 rounds up to 64, but 68 rounds up to 128. So we wind up +using twice as much memory per node, because of power-of-two +allocations, which is a big bummer. We'll need to figure something out +there. + +Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") +Cc: stable@vger.kernel.org +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + drivers/net/wireguard/allowedips.c | 132 ++++++++++++----------------- + drivers/net/wireguard/allowedips.h | 9 +- + 2 files changed, 57 insertions(+), 84 deletions(-) + +--- a/drivers/net/wireguard/allowedips.c ++++ b/drivers/net/wireguard/allowedips.c +@@ -66,60 +66,6 @@ static void root_remove_peer_lists(struc + } + } + +-static void walk_remove_by_peer(struct allowedips_node __rcu **top, +- struct wg_peer *peer, struct mutex *lock) +-{ +-#define REF(p) rcu_access_pointer(p) +-#define DEREF(p) rcu_dereference_protected(*(p), lockdep_is_held(lock)) +-#define PUSH(p) ({ \ +- WARN_ON(IS_ENABLED(DEBUG) && len >= 128); \ +- stack[len++] = p; \ +- }) +- +- struct allowedips_node __rcu **stack[128], **nptr; +- struct allowedips_node *node, *prev; +- unsigned int len; +- +- if (unlikely(!peer || !REF(*top))) +- return; +- +- for (prev = NULL, len = 0, PUSH(top); len > 0; prev = node) { +- nptr = stack[len - 1]; +- node = DEREF(nptr); +- if (!node) { +- --len; +- continue; +- } +- if (!prev || REF(prev->bit[0]) == node || +- REF(prev->bit[1]) == node) { +- if (REF(node->bit[0])) +- PUSH(&node->bit[0]); +- else if (REF(node->bit[1])) +- PUSH(&node->bit[1]); +- } else if (REF(node->bit[0]) == prev) { +- if (REF(node->bit[1])) +- PUSH(&node->bit[1]); +- } else { +- if (rcu_dereference_protected(node->peer, +- lockdep_is_held(lock)) == peer) { +- RCU_INIT_POINTER(node->peer, NULL); +- list_del_init(&node->peer_list); +- if (!node->bit[0] || !node->bit[1]) { +- rcu_assign_pointer(*nptr, DEREF( +- &node->bit[!REF(node->bit[0])])); +- kfree_rcu(node, rcu); +- node = DEREF(nptr); +- } +- } +- --len; +- } +- } +- +-#undef REF +-#undef DEREF +-#undef PUSH +-} +- + static unsigned int fls128(u64 a, u64 b) + { + return a ? fls64(a) + 64U : fls64(b); +@@ -224,6 +170,7 @@ static int add(struct allowedips_node __ + RCU_INIT_POINTER(node->peer, peer); + list_add_tail(&node->peer_list, &peer->allowedips_list); + copy_and_assign_cidr(node, key, cidr, bits); ++ rcu_assign_pointer(node->parent_bit, trie); + rcu_assign_pointer(*trie, node); + return 0; + } +@@ -243,9 +190,9 @@ static int add(struct allowedips_node __ + if (!node) { + down = rcu_dereference_protected(*trie, lockdep_is_held(lock)); + } else { +- down = rcu_dereference_protected(CHOOSE_NODE(node, key), +- lockdep_is_held(lock)); ++ down = rcu_dereference_protected(CHOOSE_NODE(node, key), lockdep_is_held(lock)); + if (!down) { ++ rcu_assign_pointer(newnode->parent_bit, &CHOOSE_NODE(node, key)); + rcu_assign_pointer(CHOOSE_NODE(node, key), newnode); + return 0; + } +@@ -254,29 +201,37 @@ static int add(struct allowedips_node __ + parent = node; + + if (newnode->cidr == cidr) { ++ rcu_assign_pointer(down->parent_bit, &CHOOSE_NODE(newnode, down->bits)); + rcu_assign_pointer(CHOOSE_NODE(newnode, down->bits), down); +- if (!parent) ++ if (!parent) { ++ rcu_assign_pointer(newnode->parent_bit, trie); + rcu_assign_pointer(*trie, newnode); +- else +- rcu_assign_pointer(CHOOSE_NODE(parent, newnode->bits), +- newnode); +- } else { +- node = kzalloc(sizeof(*node), GFP_KERNEL); +- if (unlikely(!node)) { +- list_del(&newnode->peer_list); +- kfree(newnode); +- return -ENOMEM; ++ } else { ++ rcu_assign_pointer(newnode->parent_bit, &CHOOSE_NODE(parent, newnode->bits)); ++ rcu_assign_pointer(CHOOSE_NODE(parent, newnode->bits), newnode); + } +- INIT_LIST_HEAD(&node->peer_list); +- copy_and_assign_cidr(node, newnode->bits, cidr, bits); ++ return 0; ++ } ++ ++ node = kzalloc(sizeof(*node), GFP_KERNEL); ++ if (unlikely(!node)) { ++ list_del(&newnode->peer_list); ++ kfree(newnode); ++ return -ENOMEM; ++ } ++ INIT_LIST_HEAD(&node->peer_list); ++ copy_and_assign_cidr(node, newnode->bits, cidr, bits); + +- rcu_assign_pointer(CHOOSE_NODE(node, down->bits), down); +- rcu_assign_pointer(CHOOSE_NODE(node, newnode->bits), newnode); +- if (!parent) +- rcu_assign_pointer(*trie, node); +- else +- rcu_assign_pointer(CHOOSE_NODE(parent, node->bits), +- node); ++ rcu_assign_pointer(down->parent_bit, &CHOOSE_NODE(node, down->bits)); ++ rcu_assign_pointer(CHOOSE_NODE(node, down->bits), down); ++ rcu_assign_pointer(newnode->parent_bit, &CHOOSE_NODE(node, newnode->bits)); ++ rcu_assign_pointer(CHOOSE_NODE(node, newnode->bits), newnode); ++ if (!parent) { ++ rcu_assign_pointer(node->parent_bit, trie); ++ rcu_assign_pointer(*trie, node); ++ } else { ++ rcu_assign_pointer(node->parent_bit, &CHOOSE_NODE(parent, node->bits)); ++ rcu_assign_pointer(CHOOSE_NODE(parent, node->bits), node); + } + return 0; + } +@@ -335,9 +290,30 @@ int wg_allowedips_insert_v6(struct allow + void wg_allowedips_remove_by_peer(struct allowedips *table, + struct wg_peer *peer, struct mutex *lock) + { ++ struct allowedips_node *node, *child, *tmp; ++ ++ if (list_empty(&peer->allowedips_list)) ++ return; + ++table->seq; +- walk_remove_by_peer(&table->root4, peer, lock); +- walk_remove_by_peer(&table->root6, peer, lock); ++ list_for_each_entry_safe(node, tmp, &peer->allowedips_list, peer_list) { ++ list_del_init(&node->peer_list); ++ RCU_INIT_POINTER(node->peer, NULL); ++ if (node->bit[0] && node->bit[1]) ++ continue; ++ child = rcu_dereference_protected( ++ node->bit[!rcu_access_pointer(node->bit[0])], ++ lockdep_is_held(lock)); ++ if (child) ++ child->parent_bit = node->parent_bit; ++ *rcu_dereference_protected(node->parent_bit, lockdep_is_held(lock)) = child; ++ kfree_rcu(node, rcu); ++ ++ /* TODO: Note that we currently don't walk up and down in order to ++ * free any potential filler nodes. This means that this function ++ * doesn't free up as much as it could, which could be revisited ++ * at some point. ++ */ ++ } + } + + int wg_allowedips_read_node(struct allowedips_node *node, u8 ip[16], u8 *cidr) +--- a/drivers/net/wireguard/allowedips.h ++++ b/drivers/net/wireguard/allowedips.h +@@ -15,14 +15,11 @@ struct wg_peer; + struct allowedips_node { + struct wg_peer __rcu *peer; + struct allowedips_node __rcu *bit[2]; +- /* While it may seem scandalous that we waste space for v4, +- * we're alloc'ing to the nearest power of 2 anyway, so this +- * doesn't actually make a difference. +- */ +- u8 bits[16] __aligned(__alignof(u64)); + u8 cidr, bit_at_a, bit_at_b, bitlen; ++ u8 bits[16] __aligned(__alignof(u64)); + +- /* Keep rarely used list at bottom to be beyond cache line. */ ++ /* Keep rarely used members at bottom to be beyond cache line. */ ++ struct allowedips_node *__rcu *parent_bit; /* XXX: this puts us at 68->128 bytes instead of 60->64 bytes!! */ + union { + struct list_head peer_list; + struct rcu_head rcu; diff --git a/target/linux/generic/backport-5.4/080-wireguard-0134-wireguard-allowedips-allocate-nodes-in-kmem_cache.patch b/target/linux/generic/backport-5.4/080-wireguard-0134-wireguard-allowedips-allocate-nodes-in-kmem_cache.patch new file mode 100644 index 0000000000..65b31b05f5 --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0134-wireguard-allowedips-allocate-nodes-in-kmem_cache.patch @@ -0,0 +1,173 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: "Jason A. Donenfeld" <Jason@zx2c4.com> +Date: Fri, 4 Jun 2021 17:17:37 +0200 +Subject: [PATCH] wireguard: allowedips: allocate nodes in kmem_cache + +commit dc680de28ca849dfe589dc15ac56d22505f0ef11 upstream. + +The previous commit moved from O(n) to O(1) for removal, but in the +process introduced an additional pointer member to a struct that +increased the size from 60 to 68 bytes, putting nodes in the 128-byte +slab. With deployed systems having as many as 2 million nodes, this +represents a significant doubling in memory usage (128 MiB -> 256 MiB). +Fix this by using our own kmem_cache, that's sized exactly right. This +also makes wireguard's memory usage more transparent in tools like +slabtop and /proc/slabinfo. + +Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") +Suggested-by: Arnd Bergmann <arnd@arndb.de> +Suggested-by: Matthew Wilcox <willy@infradead.org> +Cc: stable@vger.kernel.org +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + drivers/net/wireguard/allowedips.c | 31 ++++++++++++++++++++++++------ + drivers/net/wireguard/allowedips.h | 5 ++++- + drivers/net/wireguard/main.c | 10 +++++++++- + 3 files changed, 38 insertions(+), 8 deletions(-) + +--- a/drivers/net/wireguard/allowedips.c ++++ b/drivers/net/wireguard/allowedips.c +@@ -6,6 +6,8 @@ + #include "allowedips.h" + #include "peer.h" + ++static struct kmem_cache *node_cache; ++ + static void swap_endian(u8 *dst, const u8 *src, u8 bits) + { + if (bits == 32) { +@@ -40,6 +42,11 @@ static void push_rcu(struct allowedips_n + } + } + ++static void node_free_rcu(struct rcu_head *rcu) ++{ ++ kmem_cache_free(node_cache, container_of(rcu, struct allowedips_node, rcu)); ++} ++ + static void root_free_rcu(struct rcu_head *rcu) + { + struct allowedips_node *node, *stack[128] = { +@@ -49,7 +56,7 @@ static void root_free_rcu(struct rcu_hea + while (len > 0 && (node = stack[--len])) { + push_rcu(stack, node->bit[0], &len); + push_rcu(stack, node->bit[1], &len); +- kfree(node); ++ kmem_cache_free(node_cache, node); + } + } + +@@ -164,7 +171,7 @@ static int add(struct allowedips_node __ + return -EINVAL; + + if (!rcu_access_pointer(*trie)) { +- node = kzalloc(sizeof(*node), GFP_KERNEL); ++ node = kmem_cache_zalloc(node_cache, GFP_KERNEL); + if (unlikely(!node)) + return -ENOMEM; + RCU_INIT_POINTER(node->peer, peer); +@@ -180,7 +187,7 @@ static int add(struct allowedips_node __ + return 0; + } + +- newnode = kzalloc(sizeof(*newnode), GFP_KERNEL); ++ newnode = kmem_cache_zalloc(node_cache, GFP_KERNEL); + if (unlikely(!newnode)) + return -ENOMEM; + RCU_INIT_POINTER(newnode->peer, peer); +@@ -213,10 +220,10 @@ static int add(struct allowedips_node __ + return 0; + } + +- node = kzalloc(sizeof(*node), GFP_KERNEL); ++ node = kmem_cache_zalloc(node_cache, GFP_KERNEL); + if (unlikely(!node)) { + list_del(&newnode->peer_list); +- kfree(newnode); ++ kmem_cache_free(node_cache, newnode); + return -ENOMEM; + } + INIT_LIST_HEAD(&node->peer_list); +@@ -306,7 +313,7 @@ void wg_allowedips_remove_by_peer(struct + if (child) + child->parent_bit = node->parent_bit; + *rcu_dereference_protected(node->parent_bit, lockdep_is_held(lock)) = child; +- kfree_rcu(node, rcu); ++ call_rcu(&node->rcu, node_free_rcu); + + /* TODO: Note that we currently don't walk up and down in order to + * free any potential filler nodes. This means that this function +@@ -350,4 +357,16 @@ struct wg_peer *wg_allowedips_lookup_src + return NULL; + } + ++int __init wg_allowedips_slab_init(void) ++{ ++ node_cache = KMEM_CACHE(allowedips_node, 0); ++ return node_cache ? 0 : -ENOMEM; ++} ++ ++void wg_allowedips_slab_uninit(void) ++{ ++ rcu_barrier(); ++ kmem_cache_destroy(node_cache); ++} ++ + #include "selftest/allowedips.c" +--- a/drivers/net/wireguard/allowedips.h ++++ b/drivers/net/wireguard/allowedips.h +@@ -19,7 +19,7 @@ struct allowedips_node { + u8 bits[16] __aligned(__alignof(u64)); + + /* Keep rarely used members at bottom to be beyond cache line. */ +- struct allowedips_node *__rcu *parent_bit; /* XXX: this puts us at 68->128 bytes instead of 60->64 bytes!! */ ++ struct allowedips_node *__rcu *parent_bit; + union { + struct list_head peer_list; + struct rcu_head rcu; +@@ -53,4 +53,7 @@ struct wg_peer *wg_allowedips_lookup_src + bool wg_allowedips_selftest(void); + #endif + ++int wg_allowedips_slab_init(void); ++void wg_allowedips_slab_uninit(void); ++ + #endif /* _WG_ALLOWEDIPS_H */ +--- a/drivers/net/wireguard/main.c ++++ b/drivers/net/wireguard/main.c +@@ -21,10 +21,15 @@ static int __init mod_init(void) + { + int ret; + ++ ret = wg_allowedips_slab_init(); ++ if (ret < 0) ++ goto err_allowedips; ++ + #ifdef DEBUG ++ ret = -ENOTRECOVERABLE; + if (!wg_allowedips_selftest() || !wg_packet_counter_selftest() || + !wg_ratelimiter_selftest()) +- return -ENOTRECOVERABLE; ++ goto err_peer; + #endif + wg_noise_init(); + +@@ -50,6 +55,8 @@ err_netlink: + err_device: + wg_peer_uninit(); + err_peer: ++ wg_allowedips_slab_uninit(); ++err_allowedips: + return ret; + } + +@@ -58,6 +65,7 @@ static void __exit mod_exit(void) + wg_genetlink_uninit(); + wg_device_uninit(); + wg_peer_uninit(); ++ wg_allowedips_slab_uninit(); + } + + module_init(mod_init); diff --git a/target/linux/generic/backport-5.4/080-wireguard-0135-wireguard-allowedips-free-empty-intermediate-nodes-w.patch b/target/linux/generic/backport-5.4/080-wireguard-0135-wireguard-allowedips-free-empty-intermediate-nodes-w.patch new file mode 100644 index 0000000000..c044ad25af --- /dev/null +++ b/target/linux/generic/backport-5.4/080-wireguard-0135-wireguard-allowedips-free-empty-intermediate-nodes-w.patch @@ -0,0 +1,521 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: "Jason A. Donenfeld" <Jason@zx2c4.com> +Date: Fri, 4 Jun 2021 17:17:38 +0200 +Subject: [PATCH] wireguard: allowedips: free empty intermediate nodes when + removing single node + +commit bf7b042dc62a31f66d3a41dd4dfc7806f267b307 upstream. + +When removing single nodes, it's possible that that node's parent is an +empty intermediate node, in which case, it too should be removed. +Otherwise the trie fills up and never is fully emptied, leading to +gradual memory leaks over time for tries that are modified often. There +was originally code to do this, but was removed during refactoring in +2016 and never reworked. Now that we have proper parent pointers from +the previous commits, we can implement this properly. + +In order to reduce branching and expensive comparisons, we want to keep +the double pointer for parent assignment (which lets us easily chain up +to the root), but we still need to actually get the parent's base +address. So encode the bit number into the last two bits of the pointer, +and pack and unpack it as needed. This is a little bit clumsy but is the +fastest and less memory wasteful of the compromises. Note that we align +the root struct here to a minimum of 4, because it's embedded into a +larger struct, and we're relying on having the bottom two bits for our +flag, which would only be 16-bit aligned on m68k. + +The existing macro-based helpers were a bit unwieldy for adding the bit +packing to, so this commit replaces them with safer and clearer ordinary +functions. + +We add a test to the randomized/fuzzer part of the selftests, to free +the randomized tries by-peer, refuzz it, and repeat, until it's supposed +to be empty, and then then see if that actually resulted in the whole +thing being emptied. That combined with kmemcheck should hopefully make +sure this commit is doing what it should. Along the way this resulted in +various other cleanups of the tests and fixes for recent graphviz. + +Fixes: e7096c131e51 ("net: WireGuard secure network tunnel") +Cc: stable@vger.kernel.org +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> +--- + drivers/net/wireguard/allowedips.c | 102 ++++++------ + drivers/net/wireguard/allowedips.h | 4 +- + drivers/net/wireguard/selftest/allowedips.c | 162 ++++++++++---------- + 3 files changed, 137 insertions(+), 131 deletions(-) + +--- a/drivers/net/wireguard/allowedips.c ++++ b/drivers/net/wireguard/allowedips.c +@@ -30,8 +30,11 @@ static void copy_and_assign_cidr(struct + node->bitlen = bits; + memcpy(node->bits, src, bits / 8U); + } +-#define CHOOSE_NODE(parent, key) \ +- parent->bit[(key[parent->bit_at_a] >> parent->bit_at_b) & 1] ++ ++static inline u8 choose(struct allowedips_node *node, const u8 *key) ++{ ++ return (key[node->bit_at_a] >> node->bit_at_b) & 1; ++} + + static void push_rcu(struct allowedips_node **stack, + struct allowedips_node __rcu *p, unsigned int *len) +@@ -112,7 +115,7 @@ static struct allowedips_node *find_node + found = node; + if (node->cidr == bits) + break; +- node = rcu_dereference_bh(CHOOSE_NODE(node, key)); ++ node = rcu_dereference_bh(node->bit[choose(node, key)]); + } + return found; + } +@@ -144,8 +147,7 @@ static bool node_placement(struct allowe + u8 cidr, u8 bits, struct allowedips_node **rnode, + struct mutex *lock) + { +- struct allowedips_node *node = rcu_dereference_protected(trie, +- lockdep_is_held(lock)); ++ struct allowedips_node *node = rcu_dereference_protected(trie, lockdep_is_held(lock)); + struct allowedips_node *parent = NULL; + bool exact = false; + +@@ -155,13 +157,24 @@ static bool node_placement(struct allowe + exact = true; + break; + } +- node = rcu_dereference_protected(CHOOSE_NODE(parent, key), +- lockdep_is_held(lock)); ++ node = rcu_dereference_protected(parent->bit[choose(parent, key)], lockdep_is_held(lock)); + } + *rnode = parent; + return exact; + } + ++static inline void connect_node(struct allowedips_node **parent, u8 bit, struct allowedips_node *node) ++{ ++ node->parent_bit_packed = (unsigned long)parent | bit; ++ rcu_assign_pointer(*parent, node); ++} ++ ++static inline void choose_and_connect_node(struct allowedips_node *parent, struct allowedips_node *node) ++{ ++ u8 bit = choose(parent, node->bits); ++ connect_node(&parent->bit[bit], bit, node); ++} ++ + static int add(struct allowedips_node __rcu **trie, u8 bits, const u8 *key, + u8 cidr, struct wg_peer *peer, struct mutex *lock) + { +@@ -177,8 +190,7 @@ static int add(struct allowedips_node __ + RCU_INIT_POINTER(node->peer, peer); + list_add_tail(&node->peer_list, &peer->allowedips_list); + copy_and_assign_cidr(node, key, cidr, bits); +- rcu_assign_pointer(node->parent_bit, trie); +- rcu_assign_pointer(*trie, node); ++ connect_node(trie, 2, node); + return 0; + } + if (node_placement(*trie, key, cidr, bits, &node, lock)) { +@@ -197,10 +209,10 @@ static int add(struct allowedips_node __ + if (!node) { + down = rcu_dereference_protected(*trie, lockdep_is_held(lock)); + } else { +- down = rcu_dereference_protected(CHOOSE_NODE(node, key), lockdep_is_held(lock)); ++ const u8 bit = choose(node, key); ++ down = rcu_dereference_protected(node->bit[bit], lockdep_is_held(lock)); + if (!down) { +- rcu_assign_pointer(newnode->parent_bit, &CHOOSE_NODE(node, key)); +- rcu_assign_pointer(CHOOSE_NODE(node, key), newnode); ++ connect_node(&node->bit[bit], bit, newnode); + return 0; + } + } +@@ -208,15 +220,11 @@ static int add(struct allowedips_node __ + parent = node; + + if (newnode->cidr == cidr) { +- rcu_assign_pointer(down->parent_bit, &CHOOSE_NODE(newnode, down->bits)); +- rcu_assign_pointer(CHOOSE_NODE(newnode, down->bits), down); +- if (!parent) { +- rcu_assign_pointer(newnode->parent_bit, trie); +- rcu_assign_pointer(*trie, newnode); +- } else { +- rcu_assign_pointer(newnode->parent_bit, &CHOOSE_NODE(parent, newnode->bits)); +- rcu_assign_pointer(CHOOSE_NODE(parent, newnode->bits), newnode); +- } ++ choose_and_connect_node(newnode, down); ++ if (!parent) ++ connect_node(trie, 2, newnode); ++ else ++ choose_and_connect_node(parent, newnode); + return 0; + } + +@@ -229,17 +237,12 @@ static int add(struct allowedips_node __ + INIT_LIST_HEAD(&node->peer_list); + copy_and_assign_cidr(node, newnode->bits, cidr, bits); + +- rcu_assign_pointer(down->parent_bit, &CHOOSE_NODE(node, down->bits)); +- rcu_assign_pointer(CHOOSE_NODE(node, down->bits), down); +- rcu_assign_pointer(newnode->parent_bit, &CHOOSE_NODE(node, newnode->bits)); +- rcu_assign_pointer(CHOOSE_NODE(node, newnode->bits), newnode); +- if (!parent) { +- rcu_assign_pointer(node->parent_bit, trie); +- rcu_assign_pointer(*trie, node); +- } else { +- rcu_assign_pointer(node->parent_bit, &CHOOSE_NODE(parent, node->bits)); +- rcu_assign_pointer(CHOOSE_NODE(parent, node->bits), node); +- } ++ choose_and_connect_node(node, down); ++ choose_and_connect_node(node, newnode); ++ if (!parent) ++ connect_node(trie, 2, node); ++ else ++ choose_and_connect_node(parent, node); + return 0; + } + +@@ -297,7 +300,8 @@ int wg_allowedips_insert_v6(struct allow + void wg_allowedips_remove_by_peer(struct allowedips *table, + struct wg_peer *peer, struct mutex *lock) + { +- struct allowedips_node *node, *child, *tmp; ++ struct allowedips_node *node, *child, **parent_bit, *parent, *tmp; ++ bool free_parent; + + if (list_empty(&peer->allowedips_list)) + return; +@@ -307,19 +311,29 @@ void wg_allowedips_remove_by_peer(struct + RCU_INIT_POINTER(node->peer, NULL); + if (node->bit[0] && node->bit[1]) + continue; +- child = rcu_dereference_protected( +- node->bit[!rcu_access_pointer(node->bit[0])], +- lockdep_is_held(lock)); ++ child = rcu_dereference_protected(node->bit[!rcu_access_pointer(node->bit[0])], ++ lockdep_is_held(lock)); + if (child) +- child->parent_bit = node->parent_bit; +- *rcu_dereference_protected(node->parent_bit, lockdep_is_held(lock)) = child; ++ child->parent_bit_packed = node->parent_bit_packed; ++ parent_bit = (struct allowedips_node **)(node->parent_bit_packed & ~3UL); ++ *parent_bit = child; ++ parent = (void *)parent_bit - ++ offsetof(struct allowedips_node, bit[node->parent_bit_packed & 1]); ++ free_parent = !rcu_access_pointer(node->bit[0]) && ++ !rcu_access_pointer(node->bit[1]) && ++ (node->parent_bit_packed & 3) <= 1 && ++ !rcu_access_pointer(parent->peer); ++ if (free_parent) ++ child = rcu_dereference_protected( ++ parent->bit[!(node->parent_bit_packed & 1)], ++ lockdep_is_held(lock)); + call_rcu(&node->rcu, node_free_rcu); +- +- /* TODO: Note that we currently don't walk up and down in order to +- * free any potential filler nodes. This means that this function +- * doesn't free up as much as it could, which could be revisited +- * at some point. +- */ ++ if (!free_parent) ++ continue; ++ if (child) ++ child->parent_bit_packed = parent->parent_bit_packed; ++ *(struct allowedips_node **)(parent->parent_bit_packed & ~3UL) = child; ++ call_rcu(&parent->rcu, node_free_rcu); + } + } + +--- a/drivers/net/wireguard/allowedips.h ++++ b/drivers/net/wireguard/allowedips.h +@@ -19,7 +19,7 @@ struct allowedips_node { + u8 bits[16] __aligned(__alignof(u64)); + + /* Keep rarely used members at bottom to be beyond cache line. */ +- struct allowedips_node *__rcu *parent_bit; ++ unsigned long parent_bit_packed; + union { + struct list_head peer_list; + struct rcu_head rcu; +@@ -30,7 +30,7 @@ struct allowedips { + struct allowedips_node __rcu *root4; + struct allowedips_node __rcu *root6; + u64 seq; +-}; ++} __aligned(4); /* We pack the lower 2 bits of &root, but m68k only gives 16-bit alignment. */ + + void wg_allowedips_init(struct allowedips *table); + void wg_allowedips_free(struct allowedips *table, struct mutex *mutex); +--- a/drivers/net/wireguard/selftest/allowedips.c ++++ b/drivers/net/wireguard/selftest/allowedips.c +@@ -19,32 +19,22 @@ + + #include <linux/siphash.h> + +-static __init void swap_endian_and_apply_cidr(u8 *dst, const u8 *src, u8 bits, +- u8 cidr) +-{ +- swap_endian(dst, src, bits); +- memset(dst + (cidr + 7) / 8, 0, bits / 8 - (cidr + 7) / 8); +- if (cidr) +- dst[(cidr + 7) / 8 - 1] &= ~0U << ((8 - (cidr % 8)) % 8); +-} +- + static __init void print_node(struct allowedips_node *node, u8 bits) + { + char *fmt_connection = KERN_DEBUG "\t\"%p/%d\" -> \"%p/%d\";\n"; +- char *fmt_declaration = KERN_DEBUG +- "\t\"%p/%d\"[style=%s, color=\"#%06x\"];\n"; ++ char *fmt_declaration = KERN_DEBUG "\t\"%p/%d\"[style=%s, color=\"#%06x\"];\n"; ++ u8 ip1[16], ip2[16], cidr1, cidr2; + char *style = "dotted"; +- u8 ip1[16], ip2[16]; + u32 color = 0; + ++ if (node == NULL) ++ return; + if (bits == 32) { + fmt_connection = KERN_DEBUG "\t\"%pI4/%d\" -> \"%pI4/%d\";\n"; +- fmt_declaration = KERN_DEBUG +- "\t\"%pI4/%d\"[style=%s, color=\"#%06x\"];\n"; ++ fmt_declaration = KERN_DEBUG "\t\"%pI4/%d\"[style=%s, color=\"#%06x\"];\n"; + } else if (bits == 128) { + fmt_connection = KERN_DEBUG "\t\"%pI6/%d\" -> \"%pI6/%d\";\n"; +- fmt_declaration = KERN_DEBUG +- "\t\"%pI6/%d\"[style=%s, color=\"#%06x\"];\n"; ++ fmt_declaration = KERN_DEBUG "\t\"%pI6/%d\"[style=%s, color=\"#%06x\"];\n"; + } + if (node->peer) { + hsiphash_key_t key = { { 0 } }; +@@ -55,24 +45,20 @@ static __init void print_node(struct all + hsiphash_1u32(0xabad1dea, &key) % 200; + style = "bold"; + } +- swap_endian_and_apply_cidr(ip1, node->bits, bits, node->cidr); +- printk(fmt_declaration, ip1, node->cidr, style, color); ++ wg_allowedips_read_node(node, ip1, &cidr1); ++ printk(fmt_declaration, ip1, cidr1, style, color); + if (node->bit[0]) { +- swap_endian_and_apply_cidr(ip2, +- rcu_dereference_raw(node->bit[0])->bits, bits, +- node->cidr); +- printk(fmt_connection, ip1, node->cidr, ip2, +- rcu_dereference_raw(node->bit[0])->cidr); +- print_node(rcu_dereference_raw(node->bit[0]), bits); ++ wg_allowedips_read_node(rcu_dereference_raw(node->bit[0]), ip2, &cidr2); ++ printk(fmt_connection, ip1, cidr1, ip2, cidr2); + } + if (node->bit[1]) { +- swap_endian_and_apply_cidr(ip2, +- rcu_dereference_raw(node->bit[1])->bits, +- bits, node->cidr); +- printk(fmt_connection, ip1, node->cidr, ip2, +- rcu_dereference_raw(node->bit[1])->cidr); +- print_node(rcu_dereference_raw(node->bit[1]), bits); ++ wg_allowedips_read_node(rcu_dereference_raw(node->bit[1]), ip2, &cidr2); ++ printk(fmt_connection, ip1, cidr1, ip2, cidr2); + } ++ if (node->bit[0]) ++ print_node(rcu_dereference_raw(node->bit[0]), bits); ++ if (node->bit[1]) ++ print_node(rcu_dereference_raw(node->bit[1]), bits); + } + + static __init void print_tree(struct allowedips_node __rcu *top, u8 bits) +@@ -121,8 +107,8 @@ static __init inline union nf_inet_addr + { + union nf_inet_addr mask; + +- memset(&mask, 0x00, 128 / 8); +- memset(&mask, 0xff, cidr / 8); ++ memset(&mask, 0, sizeof(mask)); ++ memset(&mask.all, 0xff, cidr / 8); + if (cidr % 32) + mask.all[cidr / 32] = (__force u32)htonl( + (0xFFFFFFFFUL << (32 - (cidr % 32))) & 0xFFFFFFFFUL); +@@ -149,42 +135,36 @@ horrible_mask_self(struct horrible_allow + } + + static __init inline bool +-horrible_match_v4(const struct horrible_allowedips_node *node, +- struct in_addr *ip) ++horrible_match_v4(const struct horrible_allowedips_node *node, struct in_addr *ip) + { + return (ip->s_addr & node->mask.ip) == node->ip.ip; + } + + static __init inline bool +-horrible_match_v6(const struct horrible_allowedips_node *node, +- struct in6_addr *ip) ++horrible_match_v6(const struct horrible_allowedips_node *node, struct in6_addr *ip) + { +- return (ip->in6_u.u6_addr32[0] & node->mask.ip6[0]) == +- node->ip.ip6[0] && +- (ip->in6_u.u6_addr32[1] & node->mask.ip6[1]) == +- node->ip.ip6[1] && +- (ip->in6_u.u6_addr32[2] & node->mask.ip6[2]) == +- node->ip.ip6[2] && ++ return (ip->in6_u.u6_addr32[0] & node->mask.ip6[0]) == node->ip.ip6[0] && ++ (ip->in6_u.u6_addr32[1] & node->mask.ip6[1]) == node->ip.ip6[1] && ++ (ip->in6_u.u6_addr32[2] & node->mask.ip6[2]) == node->ip.ip6[2] && + (ip->in6_u.u6_addr32[3] & node->mask.ip6[3]) == node->ip.ip6[3]; + } + + static __init void +-horrible_insert_ordered(struct horrible_allowedips *table, +- struct horrible_allowedips_node *node) ++horrible_insert_ordered(struct horrible_allowedips *table, struct horrible_allowedips_node *node) + { + struct horrible_allowedips_node *other = NULL, *where = NULL; + u8 my_cidr = horrible_mask_to_cidr(node->mask); + + hlist_for_each_entry(other, &table->head, table) { +- if (!memcmp(&other->mask, &node->mask, +- sizeof(union nf_inet_addr)) && +- !memcmp(&other->ip, &node->ip, +- sizeof(union nf_inet_addr)) && +- other->ip_version == node->ip_version) { ++ if (other->ip_version == node->ip_version && ++ !memcmp(&other->mask, &node->mask, sizeof(union nf_inet_addr)) && ++ !memcmp(&other->ip, &node->ip, sizeof(union nf_inet_addr))) { + other->value = node->value; + kfree(node); + return; + } ++ } ++ hlist_for_each_entry(other, &table->head, table) { + where = other; + if (horrible_mask_to_cidr(other->mask) <= my_cidr) + break; +@@ -201,8 +181,7 @@ static __init int + horrible_allowedips_insert_v4(struct horrible_allowedips *table, + struct in_addr *ip, u8 cidr, void *value) + { +- struct horrible_allowedips_node *node = kzalloc(sizeof(*node), +- GFP_KERNEL); ++ struct horrible_allowedips_node *node = kzalloc(sizeof(*node), GFP_KERNEL); + + if (unlikely(!node)) + return -ENOMEM; +@@ -219,8 +198,7 @@ static __init int + horrible_allowedips_insert_v6(struct horrible_allowedips *table, + struct in6_addr *ip, u8 cidr, void *value) + { +- struct horrible_allowedips_node *node = kzalloc(sizeof(*node), +- GFP_KERNEL); ++ struct horrible_allowedips_node *node = kzalloc(sizeof(*node), GFP_KERNEL); + + if (unlikely(!node)) + return -ENOMEM; +@@ -234,39 +212,43 @@ horrible_allowedips_insert_v6(struct hor + } + + static __init void * +-horrible_allowedips_lookup_v4(struct horrible_allowedips *table, +- struct in_addr *ip) ++horrible_allowedips_lookup_v4(struct horrible_allowedips *table, struct in_addr *ip) + { + struct horrible_allowedips_node *node; +- void *ret = NULL; + + hlist_for_each_entry(node, &table->head, table) { +- if (node->ip_version != 4) +- continue; +- if (horrible_match_v4(node, ip)) { +- ret = node->value; +- break; +- } ++ if (node->ip_version == 4 && horrible_match_v4(node, ip)) ++ return node->value; + } +- return ret; ++ return NULL; + } + + static __init void * +-horrible_allowedips_lookup_v6(struct horrible_allowedips *table, +- struct in6_addr *ip) ++horrible_allowedips_lookup_v6(struct horrible_allowedips *table, struct in6_addr *ip) + { + struct horrible_allowedips_node *node; +- void *ret = NULL; + + hlist_for_each_entry(node, &table->head, table) { +- if (node->ip_version != 6) ++ if (node->ip_version == 6 && horrible_match_v6(node, ip)) ++ return node->value; ++ } ++ return NULL; ++} ++ ++ ++static __init void ++horrible_allowedips_remove_by_value(struct horrible_allowedips *table, void *value) ++{ ++ struct horrible_allowedips_node *node; ++ struct hlist_node *h; ++ ++ hlist_for_each_entry_safe(node, h, &table->head, table) { ++ if (node->value != value) + continue; +- if (horrible_match_v6(node, ip)) { +- ret = node->value; +- break; +- } ++ hlist_del(&node->table); ++ kfree(node); + } +- return ret; ++ + } + + static __init bool randomized_test(void) +@@ -397,23 +379,33 @@ static __init bool randomized_test(void) + print_tree(t.root6, 128); + } + +- for (i = 0; i < NUM_QUERIES; ++i) { +- prandom_bytes(ip, 4); +- if (lookup(t.root4, 32, ip) != +- horrible_allowedips_lookup_v4(&h, (struct in_addr *)ip)) { +- pr_err("allowedips random self-test: FAIL\n"); +- goto free; ++ for (j = 0;; ++j) { ++ for (i = 0; i < NUM_QUERIES; ++i) { ++ prandom_bytes(ip, 4); ++ if (lookup(t.root4, 32, ip) != horrible_allowedips_lookup_v4(&h, (struct in_addr *)ip)) { ++ horrible_allowedips_lookup_v4(&h, (struct in_addr *)ip); ++ pr_err("allowedips random v4 self-test: FAIL\n"); ++ goto free; ++ } ++ prandom_bytes(ip, 16); ++ if (lookup(t.root6, 128, ip) != horrible_allowedips_lookup_v6(&h, (struct in6_addr *)ip)) { ++ pr_err("allowedips random v6 self-test: FAIL\n"); ++ goto free; ++ } + } ++ if (j >= NUM_PEERS) ++ break; ++ mutex_lock(&mutex); ++ wg_allowedips_remove_by_peer(&t, peers[j], &mutex); ++ mutex_unlock(&mutex); ++ horrible_allowedips_remove_by_value(&h, peers[j]); + } + +- for (i = 0; i < NUM_QUERIES; ++i) { +- prandom_bytes(ip, 16); +- if (lookup(t.root6, 128, ip) != +- horrible_allowedips_lookup_v6(&h, (struct in6_addr *)ip)) { +- pr_err("allowedips random self-test: FAIL\n"); +- goto free; +- } ++ if (t.root4 || t.root6) { ++ pr_err("allowedips random self-test removal: FAIL\n"); ++ goto free; + } ++ + ret = true; + + free: |