compat: support 3.16

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

1 files changed, 22 insertions, 109 deletions

diff --git a/src/compat/compat.h b/src/compat/compat.h
index 4e6010f..cf344f7 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, 18, 0)
-#error "WireGuard requires Linux >= 3.18"
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 16, 0)
+#error "WireGuard requires Linux >= 3.16"
 #endif
 
 /* These conditionals can't be enforced by an out of tree module very easily,
@@ -20,6 +20,15 @@
 #error "WireGuard requires CONFIG_IP6_NF_IPTABLES when using CONFIG_IPV6."
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0)
+#define headers_start data
+#define headers_end data
+#endif
+
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 17, 0)
+#include "udp_tunnel/udp_tunnel_partial_compat.h"
+#endif
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0) && !defined(DEBUG) && defined(net_dbg_ratelimited)
 #undef net_dbg_ratelimited
 #define net_dbg_ratelimited(fmt, ...) do { if (0) no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0)
@@ -29,120 +38,17 @@
 #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)
+#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)
 #define dev_recursion_level() 0
 #endif
 
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 0, 0)
-#include <linux/if.h>
-#include <net/udp_tunnel.h>
-#define udp_tunnel_xmit_skb(a, b, c, d, e, f, g, h, i, j, k, l) do { struct net_device *dev__ = (c)->dev; int ret__; ret__ = udp_tunnel_xmit_skb((b)->sk_socket, a, c, d, e, f, g, h, i, j, k); iptunnel_xmit_stats(ret__, &dev__->stats, dev__->tstats); } while (0)
-#if IS_ENABLED(CONFIG_IPV6)
-#define udp_tunnel6_xmit_skb(a, b, c, d, e, f, g, h, i, j, k, l) udp_tunnel6_xmit_skb((b)->sk_socket, a, c, d, e, f, g, h, j, k);
-#endif
-#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0)
-#include <linux/if.h>
-#include <net/udp_tunnel.h>
-static inline void fake_destructor(struct sk_buff *skb)
-{
-}
-#define udp_tunnel_xmit_skb(a, b, c, d, e, f, g, h, i, j, k, l) do { struct net_device *dev__ = (c)->dev; int ret__; (c)->destructor = fake_destructor; (c)->sk = (b); ret__ = udp_tunnel_xmit_skb(a, c, d, e, f, g, h, i, j, k, l); iptunnel_xmit_stats(ret__, &dev__->stats, dev__->tstats); } while (0)
-#if IS_ENABLED(CONFIG_IPV6)
-#define udp_tunnel6_xmit_skb(a, b, c, d, e, f, g, h, i, j, k, l) do { (c)->destructor = fake_destructor; (c)->sk = (b); udp_tunnel6_xmit_skb(a, c, d, e, f, g, h, j, k, l); } while(0)
-#endif
-#else
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 5, 0)
-#include <linux/if.h>
-#include <net/udp_tunnel.h>
-#define udp_tunnel_xmit_skb(a, b, c, d, e, f, g, h, i, j, k, l) do { struct net_device *dev__ = (c)->dev; int ret__ = udp_tunnel_xmit_skb(a, b, c, d, e, f, g, h, i, j, k, l);  iptunnel_xmit_stats(ret__, &dev__->stats, dev__->tstats); } while (0)
-#endif
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0) && IS_ENABLED(CONFIG_IPV6)
-#include <linux/if.h>
-#include <net/udp_tunnel.h>
-#define udp_tunnel6_xmit_skb(a, b, c, d, e, f, g, h, i, j, k, l) udp_tunnel6_xmit_skb(a, b, c, d, e, f, g, h, j, k, l)
-#endif
-
-#endif
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
-#include <linux/if.h>
-#include <net/udp_tunnel.h>
-struct udp_port_cfg_new {
-	u8 family;
-	union {
-		struct in_addr local_ip;
-#if IS_ENABLED(CONFIG_IPV6)
-		struct in6_addr local_ip6;
-#endif
-	};
-	union {
-		struct in_addr peer_ip;
-#if IS_ENABLED(CONFIG_IPV6)
-		struct in6_addr peer_ip6;
-#endif
-	};
-	__be16 local_udp_port;
-	__be16 peer_udp_port;
-	unsigned int use_udp_checksums:1, use_udp6_tx_checksums:1, use_udp6_rx_checksums:1, ipv6_v6only:1;
-};
-static inline int __maybe_unused udp_sock_create_new(struct net *net, struct udp_port_cfg_new *cfg, struct socket **sockp)
-{
-	struct udp_port_cfg old_cfg = {
-		.family = cfg->family,
-		.local_ip = cfg->local_ip,
-#if IS_ENABLED(CONFIG_IPV6)
-		.local_ip6 = cfg->local_ip6,
-#endif
-		.peer_ip = cfg->peer_ip,
-#if IS_ENABLED(CONFIG_IPV6)
-		.peer_ip6 = cfg->peer_ip6,
-#endif
-		.local_udp_port = cfg->local_udp_port,
-		.peer_udp_port = cfg->peer_udp_port,
-		.use_udp_checksums = cfg->use_udp_checksums,
-		.use_udp6_tx_checksums = cfg->use_udp6_tx_checksums,
-		.use_udp6_rx_checksums = cfg->use_udp6_rx_checksums
-	};
-	if (cfg->family == AF_INET)
-		return udp_sock_create4(net, &old_cfg, sockp);
-
-#if IS_ENABLED(CONFIG_IPV6)
-	if (cfg->family == AF_INET6) {
-		int ret;
-		int old_bindv6only;
-		struct net *nobns;
-
-		if (cfg->ipv6_v6only) {
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 2, 0)
-			nobns = &init_net;
-#else
-			nobns = net;
-#endif
-			/* Since udp_port_cfg only learned of ipv6_v6only in 4.3, we do this horrible
-			 * hack here and set the sysctl variable temporarily to something that will
-			 * set the right option for us in sock_create. It's super racey! */
-			old_bindv6only = nobns->ipv6.sysctl.bindv6only;
-			nobns->ipv6.sysctl.bindv6only = 1;
-		}
-		ret = udp_sock_create6(net, &old_cfg, sockp);
-		if (cfg->ipv6_v6only)
-			nobns->ipv6.sysctl.bindv6only = old_bindv6only;
-		return ret;
-	}
-#endif
-	return -EPFNOSUPPORT;
-}
-#define udp_port_cfg udp_port_cfg_new
-#define udp_sock_create(a, b, c) udp_sock_create_new(a, b, c)
-#endif
-
 #if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
 #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)
+#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)
+#include <linux/if.h>
+#include <net/ip_tunnels.h>
 #define IP6_ECN_set_ce(a, b) IP6_ECN_set_ce(b)
 #endif
 
@@ -190,6 +96,13 @@ static inline u32 get_random_u32(void)
 }
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 18, 0)
+static inline void netif_keep_dst(struct net_device *dev)
+{
+	dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
+}
+#endif
+
 /* https://lkml.org/lkml/2015/6/12/415 */
 #include <linux/netdevice.h>
 static inline struct net_device *netdev_pub(void *dev)