gluon/patches/openwrt/0018-Revert-kernel-add-netfilter-actual-sk-patch.patch

From: Martin Weinelt <hexa@darmstadt.ccc.de>
Date: Sun, 6 Dec 2020 00:21:49 +0100
Subject: Revert "kernel: add netfilter-actual-sk patch"

This reverts commit c9c7b4b3945c01c2aadf3ef5d9a77c8200db80f1.

diff --git a/target/linux/generic/backport-4.14/373-netfilter_actual_sk.patch b/target/linux/generic/backport-4.14/373-netfilter_actual_sk.patch
deleted file mode 100644
index 21722ceb23bdb7cbc1126e7cc08e6151115ed0c9..0000000000000000000000000000000000000000
--- a/target/linux/generic/backport-4.14/373-netfilter_actual_sk.patch
+++ /dev/null
@@ -1,234 +0,0 @@
-From: "Jason A. Donenfeld" <Jason@zx2c4.com>
-To: Pablo Neira Ayuso <pablo@netfilter.org>,
-        netfilter-devel@vger.kernel.org, netdev@vger.kernel.org
-Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
-Subject: [PATCH nf 2/2] netfilter: use actual socket sk rather than skb sk when routing harder
-Date: Thu, 29 Oct 2020 03:56:06 +0100
-Message-ID: <20201029025606.3523771-3-Jason@zx2c4.com> (raw)
-In-Reply-To: <20201029025606.3523771-1-Jason@zx2c4.com>
-
-If netfilter changes the packet mark when mangling, the packet is
-rerouted using the route_me_harder set of functions. Prior to this
-commit, there's one big difference between route_me_harder and the
-ordinary initial routing functions, described in the comment above
-__ip_queue_xmit():
-
-   /* Note: skb->sk can be different from sk, in case of tunnels */
-   int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
-
-That function goes on to correctly make use of sk->sk_bound_dev_if,
-rather than skb->sk->sk_bound_dev_if. And indeed the comment is true: a
-tunnel will receive a packet in ndo_start_xmit with an initial skb->sk.
-It will make some transformations to that packet, and then it will send
-the encapsulated packet out of a *new* socket. That new socket will
-basically always have a different sk_bound_dev_if (otherwise there'd be
-a routing loop). So for the purposes of routing the encapsulated packet,
-the routing information as it pertains to the socket should come from
-that socket's sk, rather than the packet's original skb->sk. For that
-reason __ip_queue_xmit() and related functions all do the right thing.
-
-One might argue that all tunnels should just call skb_orphan(skb) before
-transmitting the encapsulated packet into the new socket. But tunnels do
-*not* do this -- and this is wisely avoided in skb_scrub_packet() too --
-because features like TSQ rely on skb->destructor() being called when
-that buffer space is truely available again. Calling skb_orphan(skb) too
-early would result in buffers filling up unnecessarily and accounting
-info being all wrong. Instead, additional routing must take into account
-the new sk, just as __ip_queue_xmit() notes.
-
-So, this commit addresses the problem by fishing the correct sk out of
-state->sk -- it's already set properly in the call to nf_hook() in
-__ip_local_out(), which receives the sk as part of its normal
-functionality. So we make sure to plumb state->sk through the various
-route_me_harder functions, and then make correct use of it following the
-example of __ip_queue_xmit().
-
-Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
-Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
-[aaronjg@stanford.edu: backported to 4.14]
-Signed-off-by: Aaron Goodman <aaronjg@stanford.edu>
---- a/include/linux/netfilter_ipv4.h
-+++ b/include/linux/netfilter_ipv4.h
-@@ -16,7 +16,7 @@ struct ip_rt_info {
- 	u_int32_t mark;
- };
-
--int ip_route_me_harder(struct net *net, struct sk_buff *skb, unsigned addr_type);
-+int ip_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb, unsigned addr_type);
-
- struct nf_queue_entry;
-
---- a/include/linux/netfilter_ipv6.h
-+++ b/include/linux/netfilter_ipv6.h
-@@ -41,7 +41,7 @@ struct nf_ipv6_ops {
- };
-
- #ifdef CONFIG_NETFILTER
--int ip6_route_me_harder(struct net *net, struct sk_buff *skb);
-+int ip6_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb);
- __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
- 			unsigned int dataoff, u_int8_t protocol);
-
---- a/net/ipv4/netfilter.c
-+++ b/net/ipv4/netfilter.c
-@@ -17,17 +17,19 @@
- #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 sk_buff *skb, unsigned int addr_type)
-+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;
--	const struct sock *sk = skb_to_full_sk(skb);
--	__u8 flags = sk ? inet_sk_flowi_flags(sk) : 0;
-+	__u8 flags;
- 	struct net_device *dev = skb_dst(skb)->dev;
- 	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)
-@@ -91,7 +93,7 @@ int nf_ip_reroute(struct sk_buff *skb, c
- 		      skb->mark == rt_info->mark &&
- 		      iph->daddr == rt_info->daddr &&
- 		      iph->saddr == rt_info->saddr))
--			return ip_route_me_harder(entry->state.net, skb,
-+			return ip_route_me_harder(entry->state.net, entry->state.sk, skb,
- 						  RTN_UNSPEC);
- 	}
- 	return 0;
---- a/net/ipv4/netfilter/ipt_SYNPROXY.c
-+++ b/net/ipv4/netfilter/ipt_SYNPROXY.c
-@@ -53,7 +53,7 @@ synproxy_send_tcp(struct net *net,
-
- 	skb_dst_set_noref(nskb, skb_dst(skb));
- 	nskb->protocol = htons(ETH_P_IP);
--	if (ip_route_me_harder(net, nskb, RTN_UNSPEC))
-+	if (ip_route_me_harder(net, nskb->sk, nskb, RTN_UNSPEC))
- 		goto free_nskb;
-
- 	if (nfct) {
---- a/net/ipv4/netfilter/iptable_mangle.c
-+++ b/net/ipv4/netfilter/iptable_mangle.c
-@@ -65,7 +65,7 @@ ipt_mangle_out(struct sk_buff *skb, cons
- 		    iph->daddr != daddr ||
- 		    skb->mark != mark ||
- 		    iph->tos != tos) {
--			err = ip_route_me_harder(state->net, skb, RTN_UNSPEC);
-+			err = ip_route_me_harder(state->net, state->sk, skb, RTN_UNSPEC);
- 			if (err < 0)
- 				ret = NF_DROP_ERR(err);
- 		}
---- a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
-+++ b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
-@@ -397,7 +397,7 @@ nf_nat_ipv4_local_fn(void *priv, struct
-
- 		if (ct->tuplehash[dir].tuple.dst.u3.ip !=
- 		    ct->tuplehash[!dir].tuple.src.u3.ip) {
--			err = ip_route_me_harder(state->net, skb, RTN_UNSPEC);
-+			err = ip_route_me_harder(state->net, state->sk, skb, RTN_UNSPEC);
- 			if (err < 0)
- 				ret = NF_DROP_ERR(err);
- 		}
---- a/net/ipv4/netfilter/nf_reject_ipv4.c
-+++ b/net/ipv4/netfilter/nf_reject_ipv4.c
-@@ -129,7 +129,7 @@ void nf_send_reset(struct net *net, stru
- 				   ip4_dst_hoplimit(skb_dst(nskb)));
- 	nf_reject_ip_tcphdr_put(nskb, oldskb, oth);
-
--	if (ip_route_me_harder(net, nskb, RTN_UNSPEC))
-+	if (ip_route_me_harder(net, nskb->sk, nskb, RTN_UNSPEC))
- 		goto free_nskb;
-
- 	niph = ip_hdr(nskb);
---- a/net/ipv4/netfilter/nft_chain_route_ipv4.c
-+++ b/net/ipv4/netfilter/nft_chain_route_ipv4.c
-@@ -50,7 +50,7 @@ static unsigned int nf_route_table_hook(
- 		    iph->daddr != daddr ||
- 		    skb->mark != mark ||
- 		    iph->tos != tos) {
--			err = ip_route_me_harder(state->net, skb, RTN_UNSPEC);
-+			err = ip_route_me_harder(state->net, state->sk, skb, RTN_UNSPEC);
- 			if (err < 0)
- 				ret = NF_DROP_ERR(err);
- 		}
---- a/net/ipv6/netfilter.c
-+++ b/net/ipv6/netfilter.c
-@@ -18,10 +18,10 @@
- #include <net/ip6_checksum.h>
- #include <net/netfilter/nf_queue.h>
-
--int ip6_route_me_harder(struct net *net, struct sk_buff *skb)
-+int ip6_route_me_harder(struct net *net, struct sock *sk_partial, struct sk_buff *skb)
- {
- 	const struct ipv6hdr *iph = ipv6_hdr(skb);
--	struct sock *sk = sk_to_full_sk(skb->sk);
-+	struct sock *sk = sk_to_full_sk(sk_partial);
- 	unsigned int hh_len;
- 	struct dst_entry *dst;
- 	int strict = (ipv6_addr_type(&iph->daddr) &
-@@ -82,7 +82,7 @@ static int nf_ip6_reroute(struct sk_buff
- 		if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
- 		    !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) ||
- 		    skb->mark != rt_info->mark)
--			return ip6_route_me_harder(entry->state.net, skb);
-+			return ip6_route_me_harder(entry->state.net, entry->state.sk, skb);
- 	}
- 	return 0;
- }
---- a/net/ipv6/netfilter/ip6table_mangle.c
-+++ b/net/ipv6/netfilter/ip6table_mangle.c
-@@ -60,7 +60,7 @@ ip6t_mangle_out(struct sk_buff *skb, con
- 	     skb->mark != mark ||
- 	     ipv6_hdr(skb)->hop_limit != hop_limit ||
- 	     flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
--		err = ip6_route_me_harder(state->net, skb);
-+		err = ip6_route_me_harder(state->net, state->sk, skb);
- 		if (err < 0)
- 			ret = NF_DROP_ERR(err);
- 	}
---- a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
-+++ b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
-@@ -414,7 +414,7 @@ nf_nat_ipv6_local_fn(void *priv, struct
-
- 		if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3,
- 				      &ct->tuplehash[!dir].tuple.src.u3)) {
--			err = ip6_route_me_harder(state->net, skb);
-+			err = ip6_route_me_harder(state->net, state->sk,  skb);
- 			if (err < 0)
- 				ret = NF_DROP_ERR(err);
- 		}
---- a/net/ipv6/netfilter/nft_chain_route_ipv6.c
-+++ b/net/ipv6/netfilter/nft_chain_route_ipv6.c
-@@ -52,7 +52,7 @@ static unsigned int nf_route_table_hook(
- 	     skb->mark != mark ||
- 	     ipv6_hdr(skb)->hop_limit != hop_limit ||
- 	     flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
--		err = ip6_route_me_harder(state->net, skb);
-+		err = ip6_route_me_harder(state->net, state->sk, skb);
- 		if (err < 0)
- 			ret = NF_DROP_ERR(err);
- 	}
---- a/net/netfilter/ipvs/ip_vs_core.c
-+++ b/net/netfilter/ipvs/ip_vs_core.c
-@@ -713,12 +713,12 @@ static int ip_vs_route_me_harder(struct
- 		struct dst_entry *dst = skb_dst(skb);
-
- 		if (dst->dev && !(dst->dev->flags & IFF_LOOPBACK) &&
--		    ip6_route_me_harder(ipvs->net, skb) != 0)
-+		    ip6_route_me_harder(ipvs->net, skb->sk, skb) != 0)
- 			return 1;
- 	} else
- #endif
- 		if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL) &&
--		    ip_route_me_harder(ipvs->net, skb, RTN_LOCAL) != 0)
-+		    ip_route_me_harder(ipvs->net, skb->sk, skb, RTN_LOCAL) != 0)
- 			return 1;
-
- 	return 0;