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-rw-r--r--target/linux/generic/backport-4.19/324-v4.16-netfilter-flow-table-support-for-IPv6.patch354
1 files changed, 0 insertions, 354 deletions
diff --git a/target/linux/generic/backport-4.19/324-v4.16-netfilter-flow-table-support-for-IPv6.patch b/target/linux/generic/backport-4.19/324-v4.16-netfilter-flow-table-support-for-IPv6.patch
deleted file mode 100644
index 3e7db09068..0000000000
--- a/target/linux/generic/backport-4.19/324-v4.16-netfilter-flow-table-support-for-IPv6.patch
+++ /dev/null
@@ -1,354 +0,0 @@
-From: Pablo Neira Ayuso <pablo@netfilter.org>
-Date: Sun, 7 Jan 2018 01:04:19 +0100
-Subject: [PATCH] netfilter: flow table support for IPv6
-
-This patch adds the IPv6 flow table type, that implements the datapath
-flow table to forward IPv6 traffic.
-
-This patch exports ip6_dst_mtu_forward() that is required to check for
-mtu to pass up packets that need PMTUD handling to the classic
-forwarding path.
-
-Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
----
- create mode 100644 net/ipv6/netfilter/nf_flow_table_ipv6.c
-
---- a/include/net/ipv6.h
-+++ b/include/net/ipv6.h
-@@ -889,6 +889,8 @@ static inline struct sk_buff *ip6_finish
- &inet6_sk(sk)->cork);
- }
-
-+unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst);
-+
- int ip6_dst_lookup(struct net *net, struct sock *sk, struct dst_entry **dst,
- struct flowi6 *fl6);
- struct dst_entry *ip6_dst_lookup_flow(const struct sock *sk, struct flowi6 *fl6,
---- a/net/ipv6/ip6_output.c
-+++ b/net/ipv6/ip6_output.c
-@@ -381,7 +381,7 @@ static inline int ip6_forward_finish(str
- return dst_output(net, sk, skb);
- }
-
--static unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
-+unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
- {
- unsigned int mtu;
- struct inet6_dev *idev;
-@@ -401,6 +401,7 @@ static unsigned int ip6_dst_mtu_forward(
-
- return mtu;
- }
-+EXPORT_SYMBOL_GPL(ip6_dst_mtu_forward);
-
- static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
- {
---- a/net/ipv6/netfilter/Kconfig
-+++ b/net/ipv6/netfilter/Kconfig
-@@ -99,6 +99,14 @@ config NFT_FIB_IPV6
- endif # NF_TABLES_IPV6
- endif # NF_TABLES
-
-+config NF_FLOW_TABLE_IPV6
-+ select NF_FLOW_TABLE
-+ tristate "Netfilter flow table IPv6 module"
-+ help
-+ This option adds the flow table IPv6 support.
-+
-+ To compile it as a module, choose M here.
-+
- config NF_DUP_IPV6
- tristate "Netfilter IPv6 packet duplication to alternate destination"
- depends on !NF_CONNTRACK || NF_CONNTRACK
---- a/net/ipv6/netfilter/Makefile
-+++ b/net/ipv6/netfilter/Makefile
-@@ -45,6 +45,9 @@ obj-$(CONFIG_NFT_REDIR_IPV6) += nft_redi
- obj-$(CONFIG_NFT_DUP_IPV6) += nft_dup_ipv6.o
- obj-$(CONFIG_NFT_FIB_IPV6) += nft_fib_ipv6.o
-
-+# flow table support
-+obj-$(CONFIG_NF_FLOW_TABLE_IPV6) += nf_flow_table_ipv6.o
-+
- # matches
- obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o
- obj-$(CONFIG_IP6_NF_MATCH_EUI64) += ip6t_eui64.o
---- /dev/null
-+++ b/net/ipv6/netfilter/nf_flow_table_ipv6.c
-@@ -0,0 +1,277 @@
-+#include <linux/kernel.h>
-+#include <linux/init.h>
-+#include <linux/module.h>
-+#include <linux/netfilter.h>
-+#include <linux/rhashtable.h>
-+#include <linux/ipv6.h>
-+#include <linux/netdevice.h>
-+#include <linux/ipv6.h>
-+#include <net/ipv6.h>
-+#include <net/ip6_route.h>
-+#include <net/neighbour.h>
-+#include <net/netfilter/nf_flow_table.h>
-+#include <net/netfilter/nf_tables.h>
-+/* For layer 4 checksum field offset. */
-+#include <linux/tcp.h>
-+#include <linux/udp.h>
-+
-+static int nf_flow_nat_ipv6_tcp(struct sk_buff *skb, unsigned int thoff,
-+ struct in6_addr *addr,
-+ struct in6_addr *new_addr)
-+{
-+ struct tcphdr *tcph;
-+
-+ if (!pskb_may_pull(skb, thoff + sizeof(*tcph)) ||
-+ skb_try_make_writable(skb, thoff + sizeof(*tcph)))
-+ return -1;
-+
-+ tcph = (void *)(skb_network_header(skb) + thoff);
-+ inet_proto_csum_replace16(&tcph->check, skb, addr->s6_addr32,
-+ new_addr->s6_addr32, true);
-+
-+ return 0;
-+}
-+
-+static int nf_flow_nat_ipv6_udp(struct sk_buff *skb, unsigned int thoff,
-+ struct in6_addr *addr,
-+ struct in6_addr *new_addr)
-+{
-+ struct udphdr *udph;
-+
-+ if (!pskb_may_pull(skb, thoff + sizeof(*udph)) ||
-+ skb_try_make_writable(skb, thoff + sizeof(*udph)))
-+ return -1;
-+
-+ udph = (void *)(skb_network_header(skb) + thoff);
-+ if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) {
-+ inet_proto_csum_replace16(&udph->check, skb, addr->s6_addr32,
-+ new_addr->s6_addr32, true);
-+ if (!udph->check)
-+ udph->check = CSUM_MANGLED_0;
-+ }
-+
-+ return 0;
-+}
-+
-+static int nf_flow_nat_ipv6_l4proto(struct sk_buff *skb, struct ipv6hdr *ip6h,
-+ unsigned int thoff, struct in6_addr *addr,
-+ struct in6_addr *new_addr)
-+{
-+ switch (ip6h->nexthdr) {
-+ case IPPROTO_TCP:
-+ if (nf_flow_nat_ipv6_tcp(skb, thoff, addr, new_addr) < 0)
-+ return NF_DROP;
-+ break;
-+ case IPPROTO_UDP:
-+ if (nf_flow_nat_ipv6_udp(skb, thoff, addr, new_addr) < 0)
-+ return NF_DROP;
-+ break;
-+ }
-+
-+ return 0;
-+}
-+
-+static int nf_flow_snat_ipv6(const struct flow_offload *flow,
-+ struct sk_buff *skb, struct ipv6hdr *ip6h,
-+ unsigned int thoff,
-+ enum flow_offload_tuple_dir dir)
-+{
-+ struct in6_addr addr, new_addr;
-+
-+ switch (dir) {
-+ case FLOW_OFFLOAD_DIR_ORIGINAL:
-+ addr = ip6h->saddr;
-+ new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_v6;
-+ ip6h->saddr = new_addr;
-+ break;
-+ case FLOW_OFFLOAD_DIR_REPLY:
-+ addr = ip6h->daddr;
-+ new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_v6;
-+ ip6h->daddr = new_addr;
-+ break;
-+ default:
-+ return -1;
-+ }
-+
-+ return nf_flow_nat_ipv6_l4proto(skb, ip6h, thoff, &addr, &new_addr);
-+}
-+
-+static int nf_flow_dnat_ipv6(const struct flow_offload *flow,
-+ struct sk_buff *skb, struct ipv6hdr *ip6h,
-+ unsigned int thoff,
-+ enum flow_offload_tuple_dir dir)
-+{
-+ struct in6_addr addr, new_addr;
-+
-+ switch (dir) {
-+ case FLOW_OFFLOAD_DIR_ORIGINAL:
-+ addr = ip6h->daddr;
-+ new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_v6;
-+ ip6h->daddr = new_addr;
-+ break;
-+ case FLOW_OFFLOAD_DIR_REPLY:
-+ addr = ip6h->saddr;
-+ new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_v6;
-+ ip6h->saddr = new_addr;
-+ break;
-+ default:
-+ return -1;
-+ }
-+
-+ return nf_flow_nat_ipv6_l4proto(skb, ip6h, thoff, &addr, &new_addr);
-+}
-+
-+static int nf_flow_nat_ipv6(const struct flow_offload *flow,
-+ struct sk_buff *skb,
-+ enum flow_offload_tuple_dir dir)
-+{
-+ struct ipv6hdr *ip6h = ipv6_hdr(skb);
-+ unsigned int thoff = sizeof(*ip6h);
-+
-+ if (flow->flags & FLOW_OFFLOAD_SNAT &&
-+ (nf_flow_snat_port(flow, skb, thoff, ip6h->nexthdr, dir) < 0 ||
-+ nf_flow_snat_ipv6(flow, skb, ip6h, thoff, dir) < 0))
-+ return -1;
-+ if (flow->flags & FLOW_OFFLOAD_DNAT &&
-+ (nf_flow_dnat_port(flow, skb, thoff, ip6h->nexthdr, dir) < 0 ||
-+ nf_flow_dnat_ipv6(flow, skb, ip6h, thoff, dir) < 0))
-+ return -1;
-+
-+ return 0;
-+}
-+
-+static int nf_flow_tuple_ipv6(struct sk_buff *skb, const struct net_device *dev,
-+ struct flow_offload_tuple *tuple)
-+{
-+ struct flow_ports *ports;
-+ struct ipv6hdr *ip6h;
-+ unsigned int thoff;
-+
-+ if (!pskb_may_pull(skb, sizeof(*ip6h)))
-+ return -1;
-+
-+ ip6h = ipv6_hdr(skb);
-+
-+ if (ip6h->nexthdr != IPPROTO_TCP &&
-+ ip6h->nexthdr != IPPROTO_UDP)
-+ return -1;
-+
-+ thoff = sizeof(*ip6h);
-+ if (!pskb_may_pull(skb, thoff + sizeof(*ports)))
-+ return -1;
-+
-+ ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
-+
-+ tuple->src_v6 = ip6h->saddr;
-+ tuple->dst_v6 = ip6h->daddr;
-+ tuple->src_port = ports->source;
-+ tuple->dst_port = ports->dest;
-+ tuple->l3proto = AF_INET6;
-+ tuple->l4proto = ip6h->nexthdr;
-+ tuple->iifidx = dev->ifindex;
-+
-+ return 0;
-+}
-+
-+/* Based on ip_exceeds_mtu(). */
-+static bool __nf_flow_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu)
-+{
-+ if (skb->len <= mtu)
-+ return false;
-+
-+ if (skb_is_gso(skb) && skb_gso_validate_mtu(skb, mtu))
-+ return false;
-+
-+ return true;
-+}
-+
-+static bool nf_flow_exceeds_mtu(struct sk_buff *skb, const struct rt6_info *rt)
-+{
-+ u32 mtu;
-+
-+ mtu = ip6_dst_mtu_forward(&rt->dst);
-+ if (__nf_flow_exceeds_mtu(skb, mtu))
-+ return true;
-+
-+ return false;
-+}
-+
-+static unsigned int
-+nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
-+ const struct nf_hook_state *state)
-+{
-+ struct flow_offload_tuple_rhash *tuplehash;
-+ struct nf_flowtable *flow_table = priv;
-+ struct flow_offload_tuple tuple = {};
-+ enum flow_offload_tuple_dir dir;
-+ struct flow_offload *flow;
-+ struct net_device *outdev;
-+ struct in6_addr *nexthop;
-+ struct ipv6hdr *ip6h;
-+ struct rt6_info *rt;
-+
-+ if (skb->protocol != htons(ETH_P_IPV6))
-+ return NF_ACCEPT;
-+
-+ if (nf_flow_tuple_ipv6(skb, state->in, &tuple) < 0)
-+ return NF_ACCEPT;
-+
-+ tuplehash = flow_offload_lookup(flow_table, &tuple);
-+ if (tuplehash == NULL)
-+ return NF_ACCEPT;
-+
-+ outdev = dev_get_by_index_rcu(state->net, tuplehash->tuple.oifidx);
-+ if (!outdev)
-+ return NF_ACCEPT;
-+
-+ dir = tuplehash->tuple.dir;
-+ flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
-+
-+ rt = (struct rt6_info *)flow->tuplehash[dir].tuple.dst_cache;
-+ if (unlikely(nf_flow_exceeds_mtu(skb, rt)))
-+ return NF_ACCEPT;
-+
-+ if (skb_try_make_writable(skb, sizeof(*ip6h)))
-+ return NF_DROP;
-+
-+ if (flow->flags & (FLOW_OFFLOAD_SNAT | FLOW_OFFLOAD_DNAT) &&
-+ nf_flow_nat_ipv6(flow, skb, dir) < 0)
-+ return NF_DROP;
-+
-+ flow->timeout = (u32)jiffies + NF_FLOW_TIMEOUT;
-+ ip6h = ipv6_hdr(skb);
-+ ip6h->hop_limit--;
-+
-+ skb->dev = outdev;
-+ nexthop = rt6_nexthop(rt, &flow->tuplehash[!dir].tuple.src_v6);
-+ neigh_xmit(NEIGH_ND_TABLE, outdev, nexthop, skb);
-+
-+ return NF_STOLEN;
-+}
-+
-+static struct nf_flowtable_type flowtable_ipv6 = {
-+ .family = NFPROTO_IPV6,
-+ .params = &nf_flow_offload_rhash_params,
-+ .gc = nf_flow_offload_work_gc,
-+ .hook = nf_flow_offload_ipv6_hook,
-+ .owner = THIS_MODULE,
-+};
-+
-+static int __init nf_flow_ipv6_module_init(void)
-+{
-+ nft_register_flowtable_type(&flowtable_ipv6);
-+
-+ return 0;
-+}
-+
-+static void __exit nf_flow_ipv6_module_exit(void)
-+{
-+ nft_unregister_flowtable_type(&flowtable_ipv6);
-+}
-+
-+module_init(nf_flow_ipv6_module_init);
-+module_exit(nf_flow_ipv6_module_exit);
-+
-+MODULE_LICENSE("GPL");
-+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
-+MODULE_ALIAS_NF_FLOWTABLE(AF_INET6);
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