openwrt: revert kernel: add netfilter-actual-sk patch
During the update of openwrt-19.07 in 435c5196 a breaking change was
introduced. Let's revert it for now so the master branch builds again.
This commit is contained in:
Martin Weinelt
parent
435c519658
commit
94736703ae
@ -0,0 +1,246 @@
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From: Martin Weinelt <hexa@darmstadt.ccc.de>
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Date: Sun, 6 Dec 2020 00:21:49 +0100
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Subject: Revert "kernel: add netfilter-actual-sk patch"
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This reverts commit c9c7b4b3945c01c2aadf3ef5d9a77c8200db80f1.
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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
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deleted file mode 100644
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index 21722ceb23bdb7cbc1126e7cc08e6151115ed0c9..0000000000000000000000000000000000000000
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--- a/target/linux/generic/backport-4.14/373-netfilter_actual_sk.patch
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+++ /dev/null
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@@ -1,234 +0,0 @@
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-From: "Jason A. Donenfeld" <Jason@zx2c4.com>
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-To: Pablo Neira Ayuso <pablo@netfilter.org>,
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- netfilter-devel@vger.kernel.org, netdev@vger.kernel.org
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-Cc: "Jason A. Donenfeld" <Jason@zx2c4.com>
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-Subject: [PATCH nf 2/2] netfilter: use actual socket sk rather than skb sk when routing harder
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-Date: Thu, 29 Oct 2020 03:56:06 +0100
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-Message-ID: <20201029025606.3523771-3-Jason@zx2c4.com> (raw)
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-In-Reply-To: <20201029025606.3523771-1-Jason@zx2c4.com>
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-
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-If netfilter changes the packet mark when mangling, the packet is
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-rerouted using the route_me_harder set of functions. Prior to this
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-commit, there's one big difference between route_me_harder and the
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-ordinary initial routing functions, described in the comment above
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-__ip_queue_xmit():
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-
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- /* Note: skb->sk can be different from sk, in case of tunnels */
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- int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
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-
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-That function goes on to correctly make use of sk->sk_bound_dev_if,
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-rather than skb->sk->sk_bound_dev_if. And indeed the comment is true: a
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-tunnel will receive a packet in ndo_start_xmit with an initial skb->sk.
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-It will make some transformations to that packet, and then it will send
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-the encapsulated packet out of a *new* socket. That new socket will
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-basically always have a different sk_bound_dev_if (otherwise there'd be
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-a routing loop). So for the purposes of routing the encapsulated packet,
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-the routing information as it pertains to the socket should come from
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-that socket's sk, rather than the packet's original skb->sk. For that
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-reason __ip_queue_xmit() and related functions all do the right thing.
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-
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-One might argue that all tunnels should just call skb_orphan(skb) before
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-transmitting the encapsulated packet into the new socket. But tunnels do
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-*not* do this -- and this is wisely avoided in skb_scrub_packet() too --
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-because features like TSQ rely on skb->destructor() being called when
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-that buffer space is truely available again. Calling skb_orphan(skb) too
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-early would result in buffers filling up unnecessarily and accounting
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-info being all wrong. Instead, additional routing must take into account
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-the new sk, just as __ip_queue_xmit() notes.
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-
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-So, this commit addresses the problem by fishing the correct sk out of
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-state->sk -- it's already set properly in the call to nf_hook() in
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-__ip_local_out(), which receives the sk as part of its normal
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-functionality. So we make sure to plumb state->sk through the various
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-route_me_harder functions, and then make correct use of it following the
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-example of __ip_queue_xmit().
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-
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-Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
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-Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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-[aaronjg@stanford.edu: backported to 4.14]
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-Signed-off-by: Aaron Goodman <aaronjg@stanford.edu>
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---- a/include/linux/netfilter_ipv4.h
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-+++ b/include/linux/netfilter_ipv4.h
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-@@ -16,7 +16,7 @@ struct ip_rt_info {
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- u_int32_t mark;
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- };
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-
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--int ip_route_me_harder(struct net *net, struct sk_buff *skb, unsigned addr_type);
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-+int ip_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb, unsigned addr_type);
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-
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- struct nf_queue_entry;
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-
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---- a/include/linux/netfilter_ipv6.h
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-+++ b/include/linux/netfilter_ipv6.h
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-@@ -41,7 +41,7 @@ struct nf_ipv6_ops {
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- };
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-
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- #ifdef CONFIG_NETFILTER
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--int ip6_route_me_harder(struct net *net, struct sk_buff *skb);
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-+int ip6_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb);
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- __sum16 nf_ip6_checksum(struct sk_buff *skb, unsigned int hook,
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- unsigned int dataoff, u_int8_t protocol);
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-
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---- a/net/ipv4/netfilter.c
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-+++ b/net/ipv4/netfilter.c
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-@@ -17,17 +17,19 @@
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- #include <net/netfilter/nf_queue.h>
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-
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- /* route_me_harder function, used by iptable_nat, iptable_mangle + ip_queue */
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--int ip_route_me_harder(struct net *net, struct sk_buff *skb, unsigned int addr_type)
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-+int ip_route_me_harder(struct net *net, struct sock *sk, struct sk_buff *skb, unsigned int addr_type)
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- {
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- const struct iphdr *iph = ip_hdr(skb);
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- struct rtable *rt;
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- struct flowi4 fl4 = {};
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- __be32 saddr = iph->saddr;
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-- const struct sock *sk = skb_to_full_sk(skb);
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-- __u8 flags = sk ? inet_sk_flowi_flags(sk) : 0;
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-+ __u8 flags;
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- struct net_device *dev = skb_dst(skb)->dev;
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- unsigned int hh_len;
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-
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-+ sk = sk_to_full_sk(sk);
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-+ flags = sk ? inet_sk_flowi_flags(sk) : 0;
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-+
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- if (addr_type == RTN_UNSPEC)
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- addr_type = inet_addr_type_dev_table(net, dev, saddr);
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- if (addr_type == RTN_LOCAL || addr_type == RTN_UNICAST)
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-@@ -91,7 +93,7 @@ int nf_ip_reroute(struct sk_buff *skb, c
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- skb->mark == rt_info->mark &&
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- iph->daddr == rt_info->daddr &&
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- iph->saddr == rt_info->saddr))
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-- return ip_route_me_harder(entry->state.net, skb,
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-+ return ip_route_me_harder(entry->state.net, entry->state.sk, skb,
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- RTN_UNSPEC);
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- }
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- return 0;
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---- a/net/ipv4/netfilter/ipt_SYNPROXY.c
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-+++ b/net/ipv4/netfilter/ipt_SYNPROXY.c
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-@@ -53,7 +53,7 @@ synproxy_send_tcp(struct net *net,
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-
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- skb_dst_set_noref(nskb, skb_dst(skb));
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- nskb->protocol = htons(ETH_P_IP);
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-- if (ip_route_me_harder(net, nskb, RTN_UNSPEC))
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-+ if (ip_route_me_harder(net, nskb->sk, nskb, RTN_UNSPEC))
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- goto free_nskb;
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-
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- if (nfct) {
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---- a/net/ipv4/netfilter/iptable_mangle.c
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-+++ b/net/ipv4/netfilter/iptable_mangle.c
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-@@ -65,7 +65,7 @@ ipt_mangle_out(struct sk_buff *skb, cons
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- iph->daddr != daddr ||
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- skb->mark != mark ||
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- iph->tos != tos) {
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-- err = ip_route_me_harder(state->net, skb, RTN_UNSPEC);
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-+ err = ip_route_me_harder(state->net, state->sk, skb, RTN_UNSPEC);
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- if (err < 0)
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- ret = NF_DROP_ERR(err);
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- }
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---- a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
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-+++ b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c
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-@@ -397,7 +397,7 @@ nf_nat_ipv4_local_fn(void *priv, struct
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-
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- if (ct->tuplehash[dir].tuple.dst.u3.ip !=
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- ct->tuplehash[!dir].tuple.src.u3.ip) {
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-- err = ip_route_me_harder(state->net, skb, RTN_UNSPEC);
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-+ err = ip_route_me_harder(state->net, state->sk, skb, RTN_UNSPEC);
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- if (err < 0)
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- ret = NF_DROP_ERR(err);
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- }
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---- a/net/ipv4/netfilter/nf_reject_ipv4.c
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-+++ b/net/ipv4/netfilter/nf_reject_ipv4.c
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-@@ -129,7 +129,7 @@ void nf_send_reset(struct net *net, stru
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- ip4_dst_hoplimit(skb_dst(nskb)));
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- nf_reject_ip_tcphdr_put(nskb, oldskb, oth);
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-
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-- if (ip_route_me_harder(net, nskb, RTN_UNSPEC))
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-+ if (ip_route_me_harder(net, nskb->sk, nskb, RTN_UNSPEC))
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- goto free_nskb;
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-
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- niph = ip_hdr(nskb);
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---- a/net/ipv4/netfilter/nft_chain_route_ipv4.c
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-+++ b/net/ipv4/netfilter/nft_chain_route_ipv4.c
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-@@ -50,7 +50,7 @@ static unsigned int nf_route_table_hook(
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- iph->daddr != daddr ||
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- skb->mark != mark ||
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- iph->tos != tos) {
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-- err = ip_route_me_harder(state->net, skb, RTN_UNSPEC);
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-+ err = ip_route_me_harder(state->net, state->sk, skb, RTN_UNSPEC);
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- if (err < 0)
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- ret = NF_DROP_ERR(err);
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- }
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---- a/net/ipv6/netfilter.c
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-+++ b/net/ipv6/netfilter.c
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-@@ -18,10 +18,10 @@
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- #include <net/ip6_checksum.h>
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- #include <net/netfilter/nf_queue.h>
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-
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--int ip6_route_me_harder(struct net *net, struct sk_buff *skb)
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-+int ip6_route_me_harder(struct net *net, struct sock *sk_partial, struct sk_buff *skb)
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- {
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- const struct ipv6hdr *iph = ipv6_hdr(skb);
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-- struct sock *sk = sk_to_full_sk(skb->sk);
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-+ struct sock *sk = sk_to_full_sk(sk_partial);
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- unsigned int hh_len;
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- struct dst_entry *dst;
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- int strict = (ipv6_addr_type(&iph->daddr) &
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-@@ -82,7 +82,7 @@ static int nf_ip6_reroute(struct sk_buff
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- if (!ipv6_addr_equal(&iph->daddr, &rt_info->daddr) ||
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- !ipv6_addr_equal(&iph->saddr, &rt_info->saddr) ||
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- skb->mark != rt_info->mark)
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-- return ip6_route_me_harder(entry->state.net, skb);
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-+ return ip6_route_me_harder(entry->state.net, entry->state.sk, skb);
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- }
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- return 0;
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- }
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---- a/net/ipv6/netfilter/ip6table_mangle.c
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-+++ b/net/ipv6/netfilter/ip6table_mangle.c
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-@@ -60,7 +60,7 @@ ip6t_mangle_out(struct sk_buff *skb, con
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- skb->mark != mark ||
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- ipv6_hdr(skb)->hop_limit != hop_limit ||
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- flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
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-- err = ip6_route_me_harder(state->net, skb);
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-+ err = ip6_route_me_harder(state->net, state->sk, skb);
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- if (err < 0)
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- ret = NF_DROP_ERR(err);
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- }
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---- a/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
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-+++ b/net/ipv6/netfilter/nf_nat_l3proto_ipv6.c
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-@@ -414,7 +414,7 @@ nf_nat_ipv6_local_fn(void *priv, struct
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-
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- if (!nf_inet_addr_cmp(&ct->tuplehash[dir].tuple.dst.u3,
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- &ct->tuplehash[!dir].tuple.src.u3)) {
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-- err = ip6_route_me_harder(state->net, skb);
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-+ err = ip6_route_me_harder(state->net, state->sk, skb);
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- if (err < 0)
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- ret = NF_DROP_ERR(err);
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- }
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---- a/net/ipv6/netfilter/nft_chain_route_ipv6.c
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-+++ b/net/ipv6/netfilter/nft_chain_route_ipv6.c
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-@@ -52,7 +52,7 @@ static unsigned int nf_route_table_hook(
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- skb->mark != mark ||
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- ipv6_hdr(skb)->hop_limit != hop_limit ||
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- flowlabel != *((u_int32_t *)ipv6_hdr(skb)))) {
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-- err = ip6_route_me_harder(state->net, skb);
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-+ err = ip6_route_me_harder(state->net, state->sk, skb);
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- if (err < 0)
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- ret = NF_DROP_ERR(err);
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- }
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---- a/net/netfilter/ipvs/ip_vs_core.c
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-+++ b/net/netfilter/ipvs/ip_vs_core.c
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-@@ -713,12 +713,12 @@ static int ip_vs_route_me_harder(struct
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- struct dst_entry *dst = skb_dst(skb);
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-
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- if (dst->dev && !(dst->dev->flags & IFF_LOOPBACK) &&
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-- ip6_route_me_harder(ipvs->net, skb) != 0)
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-+ ip6_route_me_harder(ipvs->net, skb->sk, skb) != 0)
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- return 1;
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- } else
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- #endif
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- if (!(skb_rtable(skb)->rt_flags & RTCF_LOCAL) &&
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-- ip_route_me_harder(ipvs->net, skb, RTN_LOCAL) != 0)
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-+ ip_route_me_harder(ipvs->net, skb->sk, skb, RTN_LOCAL) != 0)
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- return 1;
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-
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- return 0;
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