Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 95 insertions, 0 deletions

diff --git a/net/ipv4/netfilter.c b/net/ipv4/netfilter.c
new file mode 100644
index 000000000..bd1351654
--- /dev/null
+++ b/net/ipv4/netfilter.c
@@ -0,0 +1,95 @@
+/*
+ * IPv4 specific functions of netfilter core
+ *
+ * Rusty Russell (C) 2000 -- This code is GPL.
+ * Patrick McHardy (C) 2006-2012
+ */
+#include <linux/kernel.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
+#include <linux/ip.h>
+#include <linux/skbuff.h>
+#include <linux/gfp.h>
+#include <linux/export.h>
+#include <net/route.h>
+#include <net/xfrm.h>
+#include <net/ip.h>
+#include <net/netfilter/nf_queue.h>
+
+/* route_me_harder function, used by iptable_nat, iptable_mangle + ip_queue */
+int ip_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb, unsigned int addr_type)
+{
+	const struct iphdr *iph = ip_hdr(skb);
+	struct rtable *rt;
+	struct flowi4 fl4 = {};
+	__be32 saddr = iph->saddr;
+	__u8 flags;
+	struct net_device *dev = skb_dst(skb)->dev;
+	struct flow_keys flkeys;
+	unsigned int hh_len;
+
+	sk = sk_to_full_sk(sk);
+	flags = sk ? inet_sk_flowi_flags(sk) : 0;
+
+	if (addr_type == RTN_UNSPEC)
+		addr_type = inet_addr_type_dev_table(net, dev, saddr);
+	if (addr_type == RTN_LOCAL || addr_type == RTN_UNICAST)
+		flags |= FLOWI_FLAG_ANYSRC;
+	else
+		saddr = 0;
+
+	/* some non-standard hacks like ipt_REJECT.c:send_reset() can cause
+	 * packets with foreign saddr to appear on the NF_INET_LOCAL_OUT hook.
+	 */
+	fl4.daddr = iph->daddr;
+	fl4.saddr = saddr;
+	fl4.flowi4_tos = RT_TOS(iph->tos);
+	fl4.flowi4_oif = sk ? sk->sk_bound_dev_if : 0;
+	fl4.flowi4_l3mdev = l3mdev_master_ifindex(dev);
+	fl4.flowi4_mark = skb->mark;
+	fl4.flowi4_flags = flags;
+	fib4_rules_early_flow_dissect(net, skb, &fl4, &flkeys);
+	rt = ip_route_output_key(net, &fl4);
+	if (IS_ERR(rt))
+		return PTR_ERR(rt);
+
+	/* Drop old route. */
+	skb_dst_drop(skb);
+	skb_dst_set(skb, &rt->dst);
+
+	if (skb_dst(skb)->error)
+		return skb_dst(skb)->error;
+
+#ifdef CONFIG_XFRM
+	if (!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
+	    xfrm_decode_session(skb, flowi4_to_flowi(&fl4), AF_INET) == 0) {
+		struct dst_entry *dst = skb_dst(skb);
+		skb_dst_set(skb, NULL);
+		dst = xfrm_lookup(net, dst, flowi4_to_flowi(&fl4), sk, 0);
+		if (IS_ERR(dst))
+			return PTR_ERR(dst);
+		skb_dst_set(skb, dst);
+	}
+#endif
+
+	/* Change in oif may mean change in hh_len. */
+	hh_len = skb_dst(skb)->dev->hard_header_len;
+	if (skb_headroom(skb) < hh_len &&
+	    pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)),
+				0, GFP_ATOMIC))
+		return -ENOMEM;
+
+	return 0;
+}
+EXPORT_SYMBOL(ip_route_me_harder);
+
+int nf_ip_route(struct net *net, struct dst_entry **dst, struct flowi *fl,
+		bool strict __always_unused)
+{
+	struct rtable *rt = ip_route_output_key(net, &fl->u.ip4);
+	if (IS_ERR(rt))
+		return PTR_ERR(rt);
+	*dst = &rt->dst;
+	return 0;
+}
+EXPORT_SYMBOL_GPL(nf_ip_route);