compat: support 3.14

2 files changed, 130 insertions, 6 deletions

diff --git a/src/compat/compat.h b/src/compat/compat.h
index cf344f7..4f2acb9 100644
--- a/src/compat/compat.h
+++ b/src/compat/compat.h
@@ -7,8 +7,8 @@
 #include <linux/version.h>
 #include <linux/types.h>
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0)
-#error "WireGuard requires Linux >= 3.16"
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0)
+#error "WireGuard requires Linux >= 3.14"
 #endif
 
 /* These conditionals can't be enforced by an out of tree module very easily,
@@ -38,7 +38,10 @@
 #define RCU_LOCKDEP_WARN(cond, message) rcu_lockdep_assert(!(cond), message)
 #endif
 
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(3, 19, 0) && LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 6)) || (LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 12) && LINUX_VERSION_CODE > KERNEL_VERSION(3, 17, 0)) || LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 8)
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(3, 19, 0) && LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 6)) || \
+    (LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 12) && LINUX_VERSION_CODE > KERNEL_VERSION(3, 17, 0)) || \
+    (LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 8) && LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0)) || \
+    (LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 40) && LINUX_VERSION_CODE >= KERNEL_VERSION(3, 13, 0))
 #define dev_recursion_level() 0
 #endif
 
@@ -46,7 +49,11 @@
 #define ipv6_dst_lookup(a, b, c, d) ipv6_dst_lookup(b, c, d)
 #endif
 
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 5) && LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)) || (LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 17) && LINUX_VERSION_CODE > KERNEL_VERSION(3, 19, 0)) || (LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 27) && LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)) || LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 8)
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 5) && LINUX_VERSION_CODE >= KERNEL_VERSION(4, 2, 0)) || \
+    (LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 17) && LINUX_VERSION_CODE > KERNEL_VERSION(3, 19, 0)) || \
+    (LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 27) && LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)) || \
+    (LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 8) && LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0)) || \
+    (LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 40) && LINUX_VERSION_CODE >= KERNEL_VERSION(3, 13, 0))
 #include <linux/if.h>
 #include <net/ip_tunnels.h>
 #define IP6_ECN_set_ce(a, b) IP6_ECN_set_ce(b)
@@ -103,6 +110,22 @@ static inline void netif_keep_dst(struct net_device *dev)
 }
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0)
+#define netdev_alloc_pcpu_stats(type)					\
+({									\
+	typeof(type) __percpu *pcpu_stats = alloc_percpu(type);		\
+	if (pcpu_stats)	{						\
+		int __cpu;						\
+		for_each_possible_cpu(__cpu) {				\
+			typeof(type) *stat;				\
+			stat = per_cpu_ptr(pcpu_stats, __cpu);		\
+			u64_stats_init(&stat->syncp);			\
+		}							\
+	}								\
+	pcpu_stats;							\
+})
+#endif
+
 /* https://lkml.org/lkml/2015/6/12/415 */
 #include <linux/netdevice.h>
 static inline struct net_device *netdev_pub(void *dev)
diff --git a/src/compat/udp_tunnel/udp_tunnel.c b/src/compat/udp_tunnel/udp_tunnel.c
index 35e54e0..58ac61c 100644
--- a/src/compat/udp_tunnel/udp_tunnel.c
+++ b/src/compat/udp_tunnel/udp_tunnel.c
@@ -11,7 +11,11 @@
 
 /* This is global so, uh, only one real call site... This is the kind of horrific hack you'd expect to see in compat code. */
 static udp_tunnel_encap_rcv_t encap_rcv = NULL;
-static void our_sk_data_ready(struct sock *sk)
+static void our_sk_data_ready(struct sock *sk
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0)
+			      ,int unused_vulnerable_length_param
+#endif
+			      )
 {
 	struct sk_buff *skb;
 	while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
@@ -50,7 +54,11 @@ int udp_sock_create4(struct net *net, struct udp_port_cfg *cfg,
 			goto error;
 	}
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0)
+	sock->sk->sk_no_check = !cfg->use_udp_checksums;
+#else
 	sock->sk->sk_no_check_tx = !cfg->use_udp_checksums;
+#endif
 
 	*sockp = sock;
 	return 0;
@@ -75,6 +83,48 @@ void setup_udp_tunnel_sock(struct net *net, struct socket *sock,
 }
 EXPORT_SYMBOL_GPL(setup_udp_tunnel_sock);
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0)
+static inline __sum16 udp_v4_check(int len, __be32 saddr,
+				   __be32 daddr, __wsum base)
+{
+	return csum_tcpudp_magic(saddr, daddr, len, IPPROTO_UDP, base);
+}
+
+static void udp_set_csum(bool nocheck, struct sk_buff *skb,
+		  __be32 saddr, __be32 daddr, int len)
+{
+	struct udphdr *uh = udp_hdr(skb);
+
+	if (nocheck)
+		uh->check = 0;
+	else if (skb_is_gso(skb))
+		uh->check = ~udp_v4_check(len, saddr, daddr, 0);
+	else if (skb_dst(skb) && skb_dst(skb)->dev &&
+		 (skb_dst(skb)->dev->features & NETIF_F_V4_CSUM)) {
+
+		BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
+
+		skb->ip_summed = CHECKSUM_PARTIAL;
+		skb->csum_start = skb_transport_header(skb) - skb->head;
+		skb->csum_offset = offsetof(struct udphdr, check);
+		uh->check = ~udp_v4_check(len, saddr, daddr, 0);
+	} else {
+		__wsum csum;
+
+		BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
+
+		uh->check = 0;
+		csum = skb_checksum(skb, 0, len, 0);
+		uh->check = udp_v4_check(len, saddr, daddr, csum);
+		if (uh->check == 0)
+			uh->check = CSUM_MANGLED_0;
+
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+	}
+}
+
+#endif
+
 static void fake_destructor(struct sk_buff *skb)
 {
 }
@@ -103,7 +153,11 @@ void udp_tunnel_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb
 		skb->destructor = fake_destructor;
 	}
 
-	iptunnel_xmit(sk, rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, xnet);
+	iptunnel_xmit(
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 15, 0)
+		       sk,
+#endif
+		       rt, skb, src, dst, IPPROTO_UDP, tos, ttl, df, xnet);
 }
 EXPORT_SYMBOL_GPL(udp_tunnel_xmit_skb);
 
@@ -171,8 +225,12 @@ int udp_sock_create6(struct net *net, struct udp_port_cfg *cfg,
 	if (err < 0)
 		goto error;
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0)
+	sock->sk->sk_no_check = !cfg->use_udp_checksums;
+#else
 	udp_set_no_check6_tx(sock->sk, !cfg->use_udp6_tx_checksums);
 	udp_set_no_check6_rx(sock->sk, !cfg->use_udp6_rx_checksums);
+#endif
 
 	*sockp = sock;
 	return 0;
@@ -187,6 +245,49 @@ error:
 }
 EXPORT_SYMBOL_GPL(udp_sock_create6);
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0)
+static inline __sum16 udp_v6_check(int len,
+		const struct in6_addr *saddr,
+		const struct in6_addr *daddr,
+		__wsum base)
+{
+	return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base);
+}
+static void udp6_set_csum(bool nocheck, struct sk_buff *skb,
+		   const struct in6_addr *saddr,
+		   const struct in6_addr *daddr, int len)
+{
+	struct udphdr *uh = udp_hdr(skb);
+
+	if (nocheck)
+		uh->check = 0;
+	else if (skb_is_gso(skb))
+		uh->check = ~udp_v6_check(len, saddr, daddr, 0);
+	else if (skb_dst(skb) && skb_dst(skb)->dev &&
+		 (skb_dst(skb)->dev->features & NETIF_F_IPV6_CSUM)) {
+
+		BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
+
+		skb->ip_summed = CHECKSUM_PARTIAL;
+		skb->csum_start = skb_transport_header(skb) - skb->head;
+		skb->csum_offset = offsetof(struct udphdr, check);
+		uh->check = ~udp_v6_check(len, saddr, daddr, 0);
+	} else {
+		__wsum csum;
+
+		BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
+
+		uh->check = 0;
+		csum = skb_checksum(skb, 0, len, 0);
+		uh->check = udp_v6_check(len, saddr, daddr, csum);
+		if (uh->check == 0)
+			uh->check = CSUM_MANGLED_0;
+
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+	}
+}
+#endif
+
 int udp_tunnel6_xmit_skb(struct dst_entry *dst, struct sock *sk,
 			 struct sk_buff *skb,
 			 struct net_device *dev, struct in6_addr *saddr,