drivers: net: Drop WireGuard

Signed-off-by: arnavpuranik <puranikarnav@gmail.com>

arch/arm64/configs/whyred-newcam_defconfig

@@ -114,7 +114,6 @@ CONFIG_XFRM_USER=y
 CONFIG_XFRM_STATISTICS=y
 CONFIG_NET_KEY=y
 CONFIG_INET=y
-CONFIG_WIREGUARD=y
 CONFIG_IP_MULTICAST=y
 CONFIG_IP_ADVANCED_ROUTER=y
 CONFIG_IP_MULTIPLE_TABLES=y

arch/arm64/configs/whyred_defconfig

@@ -114,7 +114,6 @@ CONFIG_XFRM_USER=y
 CONFIG_XFRM_STATISTICS=y
 CONFIG_NET_KEY=y
 CONFIG_INET=y
-CONFIG_WIREGUARD=y
 CONFIG_IP_MULTICAST=y
 CONFIG_IP_ADVANCED_ROUTER=y
 CONFIG_IP_MULTIPLE_TABLES=y

net/Kconfig

@@ -90,7 +90,6 @@ config INET
 	  Short answer: say Y.
 
 if INET
-source "net/wireguard/Kconfig"
 source "net/ipv4/Kconfig"
 source "net/ipv6/Kconfig"
 source "net/netlabel/Kconfig"

net/Makefile

@@ -14,7 +14,6 @@ obj-$(CONFIG_NET)		+= $(tmp-y)
 obj-$(CONFIG_LLC)		+= llc/
 obj-$(CONFIG_NET)		+= ethernet/ 802/ sched/ netlink/
 obj-$(CONFIG_NETFILTER)		+= netfilter/
-obj-$(CONFIG_WIREGUARD)		+= wireguard/
 obj-$(CONFIG_INET)		+= ipv4/
 obj-$(CONFIG_XFRM)		+= xfrm/
 obj-$(CONFIG_UNIX_SCM)		+= unix/

net/wireguard/Kbuild

-# SPDX-License-Identifier: GPL-2.0
-#
-# Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
-
-ccflags-y := -D'pr_fmt(fmt)=KBUILD_MODNAME ": " fmt'
-ccflags-y += -Wframe-larger-than=2048
-ccflags-$(CONFIG_WIREGUARD_DEBUG) += -DDEBUG -g
-ccflags-$(if $(WIREGUARD_VERSION),y,) += -D'WIREGUARD_VERSION="$(WIREGUARD_VERSION)"'
-
-wireguard-y := main.o noise.o device.o peer.o timers.o queueing.o send.o receive.o socket.o peerlookup.o allowedips.o ratelimiter.o cookie.o netlink.o
-
-include $(src)/crypto/Kbuild.include
-include $(src)/compat/Kbuild.include
-
-obj-$(if $(KBUILD_EXTMOD),m,$(CONFIG_WIREGUARD)) := wireguard.o

net/wireguard/Kconfig

-config WIREGUARD
-	tristate "IP: WireGuard secure network tunnel"
-	depends on NET && INET
-	depends on IPV6 || !IPV6
-	select NET_UDP_TUNNEL
-	select DST_CACHE
-	select CRYPTO
-	select CRYPTO_ALGAPI
-	select VFP
-	select VFPv3 if CPU_V7
-	select NEON if CPU_V7
-	select KERNEL_MODE_NEON if CPU_V7
-	default m
-	help
-	  WireGuard is a secure, fast, and easy to use replacement for IPsec
-	  that uses modern cryptography and clever networking tricks. It's
-	  designed to be fairly general purpose and abstract enough to fit most
-	  use cases, while at the same time remaining extremely simple to
-	  configure. See www.wireguard.com for more info.
-
-	  It's safe to say Y or M here, as the driver is very lightweight and
-	  is only in use when an administrator chooses to add an interface.
-
-config WIREGUARD_DEBUG
-	bool "Debugging checks and verbose messages"
-	depends on WIREGUARD
-	help
-	  This will write log messages for handshake and other events
-	  that occur for a WireGuard interface. It will also perform some
-	  extra validation checks and unit tests at various points. This is
-	  only useful for debugging.
-
-	  Say N here unless you know what you're doing.

net/wireguard/Makefile

-# SPDX-License-Identifier: GPL-2.0
-#
-# Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
-
-KERNELRELEASE ?= $(shell uname -r)
-KERNELDIR ?= /lib/modules/$(KERNELRELEASE)/build
-PREFIX ?= /usr
-DESTDIR ?=
-SRCDIR ?= $(PREFIX)/src
-DKMSDIR ?= $(SRCDIR)/wireguard
-DEPMOD ?= depmod
-DEPMODBASEDIR ?= /
-
-PWD := $(shell pwd)
-
-all: module
-debug: module-debug
-
-ifneq ($(V),1)
-MAKEFLAGS += --no-print-directory
-endif
-
-WIREGUARD_VERSION = $(patsubst v%,%,$(shell GIT_CEILING_DIRECTORIES="$(PWD)/../.." git describe --dirty 2>/dev/null))
-
-module:
-	@$(MAKE) -C $(KERNELDIR) M=$(PWD) WIREGUARD_VERSION="$(WIREGUARD_VERSION)" modules
-
-module-debug:
-	@$(MAKE) -C $(KERNELDIR) M=$(PWD) V=1 CONFIG_WIREGUARD_DEBUG=y WIREGUARD_VERSION="$(WIREGUARD_VERSION)" modules
-
-clean:
-	@$(MAKE) -C $(KERNELDIR) M=$(PWD) clean
-
-module-install:
-	@$(MAKE) -C $(KERNELDIR) M=$(PWD) WIREGUARD_VERSION="$(WIREGUARD_VERSION)" modules_install
-	$(DEPMOD) -b "$(DEPMODBASEDIR)" -a $(KERNELRELEASE)
-
-install: module-install
-
-rwildcard=$(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2) $(filter $(subst *,%,$2),$d))
-DKMS_SOURCES := version.h Makefile Kbuild Kconfig dkms.conf $(filter-out version.h wireguard.mod.c tests/%,$(call rwildcard,,*.c *.h *.S *.pl *.include))
-dkms-install: $(DKMS_SOURCES)
-	@$(foreach f,$(DKMS_SOURCES),install -v -m0644 -D $(f) $(DESTDIR)$(DKMSDIR)/$(f);)
-
-style:
-	$(KERNELDIR)/scripts/checkpatch.pl -f --max-line-length=4000 --codespell --color=always $(filter-out wireguard.mod.c,$(wildcard *.c)) $(wildcard *.h) $(wildcard selftest/*.c)
-
-check: clean
-	scan-build --html-title=wireguard-linux-compat -maxloop 100 --view --keep-going $(MAKE) module CONFIG_WIREGUARD_DEBUG=y C=2 CF="-D__CHECK_ENDIAN__"
-
-coccicheck: clean
-	@$(MAKE) -C $(KERNELDIR) M=$(PWD) CONFIG_WIREGUARD_DEBUG=y coccicheck MODE=report
-
-cloc:
-	@cloc --skip-uniqueness --by-file --extract-with="$$(readlink -f ../kernel-tree-scripts/filter-compat-defines.sh) >FILE< > \$$(basename >FILE<)" $(filter-out wireguard.mod.c,$(wildcard *.c)) $(wildcard *.h)
-
--include tests/debug.mk
-
-.PHONY: all module module-debug module-install install dkms-install clean cloc check style

net/wireguard/allowedips.c

-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
- */
-
-#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) {
-		*(u32 *)dst = be32_to_cpu(*(const __be32 *)src);
-	} else if (bits == 128) {
-		((u64 *)dst)[0] = be64_to_cpu(((const __be64 *)src)[0]);
-		((u64 *)dst)[1] = be64_to_cpu(((const __be64 *)src)[1]);
-	}
-}
-
-static void copy_and_assign_cidr(struct allowedips_node *node, const u8 *src,
-				 u8 cidr, u8 bits)
-{
-	node->cidr = cidr;
-	node->bit_at_a = cidr / 8U;
-#ifdef __LITTLE_ENDIAN
-	node->bit_at_a ^= (bits / 8U - 1U) % 8U;
-#endif
-	node->bit_at_b = 7U - (cidr % 8U);
-	node->bitlen = bits;
-	memcpy(node->bits, src, bits / 8U);
-}
-
-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)
-{
-	if (rcu_access_pointer(p)) {
-		WARN_ON(IS_ENABLED(DEBUG) && *len >= 128);
-		stack[(*len)++] = rcu_dereference_raw(p);
-	}
-}
-
-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] = {
-		container_of(rcu, struct allowedips_node, rcu) };
-	unsigned int len = 1;
-
-	while (len > 0 && (node = stack[--len])) {
-		push_rcu(stack, node->bit[0], &len);
-		push_rcu(stack, node->bit[1], &len);
-		kmem_cache_free(node_cache, node);
-	}
-}
-
-static void root_remove_peer_lists(struct allowedips_node *root)
-{
-	struct allowedips_node *node, *stack[128] = { root };
-	unsigned int len = 1;
-
-	while (len > 0 && (node = stack[--len])) {
-		push_rcu(stack, node->bit[0], &len);
-		push_rcu(stack, node->bit[1], &len);
-		if (rcu_access_pointer(node->peer))
-			list_del(&node->peer_list);
-	}
-}
-
-static unsigned int fls128(u64 a, u64 b)
-{
-	return a ? fls64(a) + 64U : fls64(b);
-}
-
-static u8 common_bits(const struct allowedips_node *node, const u8 *key,
-		      u8 bits)
-{
-	if (bits == 32)
-		return 32U - fls(*(const u32 *)node->bits ^ *(const u32 *)key);
-	else if (bits == 128)
-		return 128U - fls128(
-			*(const u64 *)&node->bits[0] ^ *(const u64 *)&key[0],
-			*(const u64 *)&node->bits[8] ^ *(const u64 *)&key[8]);
-	return 0;
-}
-
-static bool prefix_matches(const struct allowedips_node *node, const u8 *key,
-			   u8 bits)
-{
-	/* This could be much faster if it actually just compared the common
-	 * bits properly, by precomputing a mask bswap(~0 << (32 - cidr)), and
-	 * the rest, but it turns out that common_bits is already super fast on
-	 * modern processors, even taking into account the unfortunate bswap.
-	 * So, we just inline it like this instead.
-	 */
-	return common_bits(node, key, bits) >= node->cidr;
-}
-
-static struct allowedips_node *find_node(struct allowedips_node *trie, u8 bits,
-					 const u8 *key)
-{
-	struct allowedips_node *node = trie, *found = NULL;
-
-	while (node && prefix_matches(node, key, bits)) {
-		if (rcu_access_pointer(node->peer))
-			found = node;
-		if (node->cidr == bits)
-			break;
-		node = rcu_dereference_bh(node->bit[choose(node, key)]);
-	}
-	return found;
-}
-
-/* Returns a strong reference to a peer */
-static struct wg_peer *lookup(struct allowedips_node __rcu *root, u8 bits,
-			      const void *be_ip)
-{
-	/* Aligned so it can be passed to fls/fls64 */
-	u8 ip[16] __aligned(__alignof(u64));
-	struct allowedips_node *node;
-	struct wg_peer *peer = NULL;
-
-	swap_endian(ip, be_ip, bits);
-
-	rcu_read_lock_bh();
-retry:
-	node = find_node(rcu_dereference_bh(root), bits, ip);
-	if (node) {
-		peer = wg_peer_get_maybe_zero(rcu_dereference_bh(node->peer));
-		if (!peer)
-			goto retry;
-	}
-	rcu_read_unlock_bh();
-	return peer;
-}
-
-static bool node_placement(struct allowedips_node __rcu *trie, const u8 *key,
-			   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 *parent = NULL;
-	bool exact = false;
-
-	while (node && node->cidr <= cidr && prefix_matches(node, key, bits)) {
-		parent = node;
-		if (parent->cidr == cidr) {
-			exact = true;
-			break;
-		}
-		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 __rcu **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)
-{
-	struct allowedips_node *node, *parent, *down, *newnode;
-
-	if (unlikely(cidr > bits || !peer))
-		return -EINVAL;
-
-	if (!rcu_access_pointer(*trie)) {
-		node = kmem_cache_zalloc(node_cache, GFP_KERNEL);
-		if (unlikely(!node))
-			return -ENOMEM;
-		RCU_INIT_POINTER(node->peer, peer);
-		list_add_tail(&node->peer_list, &peer->allowedips_list);
-		copy_and_assign_cidr(node, key, cidr, bits);
-		connect_node(trie, 2, node);
-		return 0;
-	}
-	if (node_placement(*trie, key, cidr, bits, &node, lock)) {
-		rcu_assign_pointer(node->peer, peer);
-		list_move_tail(&node->peer_list, &peer->allowedips_list);
-		return 0;
-	}
-
-	newnode = kmem_cache_zalloc(node_cache, GFP_KERNEL);
-	if (unlikely(!newnode))
-		return -ENOMEM;
-	RCU_INIT_POINTER(newnode->peer, peer);
-	list_add_tail(&newnode->peer_list, &peer->allowedips_list);
-	copy_and_assign_cidr(newnode, key, cidr, bits);
-
-	if (!node) {
-		down = rcu_dereference_protected(*trie, lockdep_is_held(lock));
-	} else {
-		const u8 bit = choose(node, key);
-		down = rcu_dereference_protected(node->bit[bit], lockdep_is_held(lock));
-		if (!down) {
-			connect_node(&node->bit[bit], bit, newnode);
-			return 0;
-		}
-	}
-	cidr = min(cidr, common_bits(down, key, bits));
-	parent = node;
-
-	if (newnode->cidr == cidr) {
-		choose_and_connect_node(newnode, down);
-		if (!parent)
-			connect_node(trie, 2, newnode);
-		else
-			choose_and_connect_node(parent, newnode);
-		return 0;
-	}
-
-	node = kmem_cache_zalloc(node_cache, GFP_KERNEL);
-	if (unlikely(!node)) {
-		list_del(&newnode->peer_list);
-		kmem_cache_free(node_cache, newnode);
-		return -ENOMEM;
-	}
-	INIT_LIST_HEAD(&node->peer_list);
-	copy_and_assign_cidr(node, newnode->bits, cidr, bits);
-
-	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;
-}
-
-void wg_allowedips_init(struct allowedips *table)
-{
-	table->root4 = table->root6 = NULL;
-	table->seq = 1;
-}
-
-void wg_allowedips_free(struct allowedips *table, struct mutex *lock)
-{
-	struct allowedips_node __rcu *old4 = table->root4, *old6 = table->root6;
-
-	++table->seq;
-	RCU_INIT_POINTER(table->root4, NULL);
-	RCU_INIT_POINTER(table->root6, NULL);
-	if (rcu_access_pointer(old4)) {
-		struct allowedips_node *node = rcu_dereference_protected(old4,
-							lockdep_is_held(lock));
-
-		root_remove_peer_lists(node);
-		call_rcu(&node->rcu, root_free_rcu);
-	}
-	if (rcu_access_pointer(old6)) {
-		struct allowedips_node *node = rcu_dereference_protected(old6,
-							lockdep_is_held(lock));
-
-		root_remove_peer_lists(node);
-		call_rcu(&node->rcu, root_free_rcu);
-	}
-}
-
-int wg_allowedips_insert_v4(struct allowedips *table, const struct in_addr *ip,
-			    u8 cidr, struct wg_peer *peer, struct mutex *lock)
-{
-	/* Aligned so it can be passed to fls */
-	u8 key[4] __aligned(__alignof(u32));
-
-	++table->seq;
-	swap_endian(key, (const u8 *)ip, 32);
-	return add(&table->root4, 32, key, cidr, peer, lock);
-}
-
-int wg_allowedips_insert_v6(struct allowedips *table, const struct in6_addr *ip,
-			    u8 cidr, struct wg_peer *peer, struct mutex *lock)
-{
-	/* Aligned so it can be passed to fls64 */
-	u8 key[16] __aligned(__alignof(u64));
-
-	++table->seq;
-	swap_endian(key, (const u8 *)ip, 128);
-	return add(&table->root6, 128, key, cidr, peer, lock);
-}
-
-void wg_allowedips_remove_by_peer(struct allowedips *table,
-				  struct wg_peer *peer, struct mutex *lock)
-{
-	struct allowedips_node *node, *child, **parent_bit, *parent, *tmp;
-	bool free_parent;
-
-	if (list_empty(&peer->allowedips_list))
-		return;
-	++table->seq;
-	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_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);
-		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);
-	}
-}
-
-int wg_allowedips_read_node(struct allowedips_node *node, u8 ip[16], u8 *cidr)
-{
-	const unsigned int cidr_bytes = DIV_ROUND_UP(node->cidr, 8U);
-	swap_endian(ip, node->bits, node->bitlen);
-	memset(ip + cidr_bytes, 0, node->bitlen / 8U - cidr_bytes);
-	if (node->cidr)
-		ip[cidr_bytes - 1U] &= ~0U << (-node->cidr % 8U);
-
-	*cidr = node->cidr;
-	return node->bitlen == 32 ? AF_INET : AF_INET6;
-}
-
-/* Returns a strong reference to a peer */
-struct wg_peer *wg_allowedips_lookup_dst(struct allowedips *table,
-					 struct sk_buff *skb)
-{
-	if (skb->protocol == htons(ETH_P_IP))
-		return lookup(table->root4, 32, &ip_hdr(skb)->daddr);
-	else if (skb->protocol == htons(ETH_P_IPV6))
-		return lookup(table->root6, 128, &ipv6_hdr(skb)->daddr);
-	return NULL;
-}
-
-/* Returns a strong reference to a peer */
-struct wg_peer *wg_allowedips_lookup_src(struct allowedips *table,
-					 struct sk_buff *skb)
-{
-	if (skb->protocol == htons(ETH_P_IP))
-		return lookup(table->root4, 32, &ip_hdr(skb)->saddr);
-	else if (skb->protocol == htons(ETH_P_IPV6))
-		return lookup(table->root6, 128, &ipv6_hdr(skb)->saddr);
-	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"

net/wireguard/allowedips.h

-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
- */
-
-#ifndef _WG_ALLOWEDIPS_H
-#define _WG_ALLOWEDIPS_H
-
-#include <linux/mutex.h>
-#include <linux/ip.h>
-#include <linux/ipv6.h>
-
-struct wg_peer;
-
-struct allowedips_node {
-	struct wg_peer __rcu *peer;
-	struct allowedips_node __rcu *bit[2];
-	u8 cidr, bit_at_a, bit_at_b, bitlen;
-	u8 bits[16] __aligned(__alignof(u64));
-
-	/* Keep rarely used members at bottom to be beyond cache line. */
-	unsigned long parent_bit_packed;
-	union {
-		struct list_head peer_list;
-		struct rcu_head rcu;
-	};
-};
-
-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);
-int wg_allowedips_insert_v4(struct allowedips *table, const struct in_addr *ip,
-			    u8 cidr, struct wg_peer *peer, struct mutex *lock);
-int wg_allowedips_insert_v6(struct allowedips *table, const struct in6_addr *ip,
-			    u8 cidr, struct wg_peer *peer, struct mutex *lock);
-void wg_allowedips_remove_by_peer(struct allowedips *table,
-				  struct wg_peer *peer, struct mutex *lock);
-/* The ip input pointer should be __aligned(__alignof(u64))) */
-int wg_allowedips_read_node(struct allowedips_node *node, u8 ip[16], u8 *cidr);
-
-/* These return a strong reference to a peer: */
-struct wg_peer *wg_allowedips_lookup_dst(struct allowedips *table,
-					 struct sk_buff *skb);
-struct wg_peer *wg_allowedips_lookup_src(struct allowedips *table,
-					 struct sk_buff *skb);
-
-#ifdef DEBUG
-bool wg_allowedips_selftest(void);
-#endif
-
-int wg_allowedips_slab_init(void);
-void wg_allowedips_slab_uninit(void);
-
-#endif /* _WG_ALLOWEDIPS_H */