From: Felix Fietkau Date: Tue, 20 Feb 2018 15:56:02 +0100 Subject: [PATCH] netfilter: add xt_FLOWOFFLOAD target Signed-off-by: Felix Fietkau --- create mode 100644 net/netfilter/xt_OFFLOAD.c --- a/net/ipv4/netfilter/Kconfig +++ b/net/ipv4/netfilter/Kconfig @@ -56,8 +56,6 @@ config NF_TABLES_ARP help This option enables the ARP support for nf_tables. -endif # NF_TABLES - config NF_FLOW_TABLE_IPV4 tristate "Netfilter flow table IPv4 module" depends on NF_FLOW_TABLE @@ -66,6 +64,8 @@ config NF_FLOW_TABLE_IPV4 To compile it as a module, choose M here. +endif # NF_TABLES + config NF_DUP_IPV4 tristate "Netfilter IPv4 packet duplication to alternate destination" depends on !NF_CONNTRACK || NF_CONNTRACK --- a/net/ipv6/netfilter/Kconfig +++ b/net/ipv6/netfilter/Kconfig @@ -45,7 +45,6 @@ config NFT_FIB_IPV6 multicast or blackhole. endif # NF_TABLES_IPV6 -endif # NF_TABLES config NF_FLOW_TABLE_IPV6 tristate "Netfilter flow table IPv6 module" @@ -55,6 +54,8 @@ config NF_FLOW_TABLE_IPV6 To compile it as a module, choose M here. +endif # NF_TABLES + config NF_DUP_IPV6 tristate "Netfilter IPv6 packet duplication to alternate destination" depends on !NF_CONNTRACK || NF_CONNTRACK --- a/net/netfilter/Kconfig +++ b/net/netfilter/Kconfig @@ -683,8 +683,6 @@ config NFT_FIB_NETDEV endif # NF_TABLES_NETDEV -endif # NF_TABLES - config NF_FLOW_TABLE_INET tristate "Netfilter flow table mixed IPv4/IPv6 module" depends on NF_FLOW_TABLE @@ -693,11 +691,12 @@ config NF_FLOW_TABLE_INET To compile it as a module, choose M here. +endif # NF_TABLES + config NF_FLOW_TABLE tristate "Netfilter flow table module" depends on NETFILTER_INGRESS depends on NF_CONNTRACK - depends on NF_TABLES help This option adds the flow table core infrastructure. @@ -977,6 +976,15 @@ config NETFILTER_XT_TARGET_NOTRACK depends on NETFILTER_ADVANCED select NETFILTER_XT_TARGET_CT +config NETFILTER_XT_TARGET_FLOWOFFLOAD + tristate '"FLOWOFFLOAD" target support' + depends on NF_FLOW_TABLE + depends on NETFILTER_INGRESS + help + This option adds a `FLOWOFFLOAD' target, which uses the nf_flow_offload + module to speed up processing of packets by bypassing the usual + netfilter chains + config NETFILTER_XT_TARGET_RATEEST tristate '"RATEEST" target support' depends on NETFILTER_ADVANCED --- a/net/netfilter/Makefile +++ b/net/netfilter/Makefile @@ -145,6 +145,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_CLASSIF obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSECMARK) += xt_CONNSECMARK.o obj-$(CONFIG_NETFILTER_XT_TARGET_CT) += xt_CT.o obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o +obj-$(CONFIG_NETFILTER_XT_TARGET_FLOWOFFLOAD) += xt_FLOWOFFLOAD.o obj-$(CONFIG_NETFILTER_XT_TARGET_HL) += xt_HL.o obj-$(CONFIG_NETFILTER_XT_TARGET_HMARK) += xt_HMARK.o obj-$(CONFIG_NETFILTER_XT_TARGET_LED) += xt_LED.o --- /dev/null +++ b/net/netfilter/xt_FLOWOFFLOAD.c @@ -0,0 +1,658 @@ +/* + * Copyright (C) 2018-2021 Felix Fietkau + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct xt_flowoffload_hook { + struct hlist_node list; + struct nf_hook_ops ops; + struct net *net; + bool registered; + bool used; +}; + +struct xt_flowoffload_table { + struct nf_flowtable ft; + struct hlist_head hooks; + struct delayed_work work; +}; + +static DEFINE_SPINLOCK(hooks_lock); + +struct xt_flowoffload_table flowtable[2]; + +static unsigned int +xt_flowoffload_net_hook(void *priv, struct sk_buff *skb, + const struct nf_hook_state *state) +{ + struct nf_flowtable *ft = priv; + + if (!atomic_read(&ft->rhashtable.nelems)) + return NF_ACCEPT; + + switch (skb->protocol) { + case htons(ETH_P_IP): + return nf_flow_offload_ip_hook(priv, skb, state); + case htons(ETH_P_IPV6): + return nf_flow_offload_ipv6_hook(priv, skb, state); + } + + return NF_ACCEPT; +} + +static int +xt_flowoffload_create_hook(struct xt_flowoffload_table *table, + struct net_device *dev) +{ + struct xt_flowoffload_hook *hook; + struct nf_hook_ops *ops; + + hook = kzalloc(sizeof(*hook), GFP_ATOMIC); + if (!hook) + return -ENOMEM; + + ops = &hook->ops; + ops->pf = NFPROTO_NETDEV; + ops->hooknum = NF_NETDEV_INGRESS; + ops->priority = 10; + ops->priv = &table->ft; + ops->hook = xt_flowoffload_net_hook; + ops->dev = dev; + + hlist_add_head(&hook->list, &table->hooks); + mod_delayed_work(system_power_efficient_wq, &table->work, 0); + + return 0; +} + +static struct xt_flowoffload_hook * +flow_offload_lookup_hook(struct xt_flowoffload_table *table, + struct net_device *dev) +{ + struct xt_flowoffload_hook *hook; + + hlist_for_each_entry(hook, &table->hooks, list) { + if (hook->ops.dev == dev) + return hook; + } + + return NULL; +} + +static void +xt_flowoffload_check_device(struct xt_flowoffload_table *table, + struct net_device *dev) +{ + struct xt_flowoffload_hook *hook; + + if (!dev) + return; + + spin_lock_bh(&hooks_lock); + hook = flow_offload_lookup_hook(table, dev); + if (hook) + hook->used = true; + else + xt_flowoffload_create_hook(table, dev); + spin_unlock_bh(&hooks_lock); +} + +static void +xt_flowoffload_register_hooks(struct xt_flowoffload_table *table) +{ + struct xt_flowoffload_hook *hook; + +restart: + hlist_for_each_entry(hook, &table->hooks, list) { + if (hook->registered) + continue; + + hook->registered = true; + hook->net = dev_net(hook->ops.dev); + spin_unlock_bh(&hooks_lock); + nf_register_net_hook(hook->net, &hook->ops); + if (table->ft.flags & NF_FLOWTABLE_HW_OFFLOAD) + table->ft.type->setup(&table->ft, hook->ops.dev, + FLOW_BLOCK_BIND); + spin_lock_bh(&hooks_lock); + goto restart; + } + +} + +static bool +xt_flowoffload_cleanup_hooks(struct xt_flowoffload_table *table) +{ + struct xt_flowoffload_hook *hook; + bool active = false; + +restart: + spin_lock_bh(&hooks_lock); + hlist_for_each_entry(hook, &table->hooks, list) { + if (hook->used || !hook->registered) { + active = true; + continue; + } + + hlist_del(&hook->list); + spin_unlock_bh(&hooks_lock); + if (table->ft.flags & NF_FLOWTABLE_HW_OFFLOAD) + table->ft.type->setup(&table->ft, hook->ops.dev, + FLOW_BLOCK_UNBIND); + nf_unregister_net_hook(hook->net, &hook->ops); + kfree(hook); + goto restart; + } + spin_unlock_bh(&hooks_lock); + + return active; +} + +static void +xt_flowoffload_check_hook(struct flow_offload *flow, void *data) +{ + struct xt_flowoffload_table *table = data; + struct flow_offload_tuple *tuple0 = &flow->tuplehash[0].tuple; + struct flow_offload_tuple *tuple1 = &flow->tuplehash[1].tuple; + struct xt_flowoffload_hook *hook; + + spin_lock_bh(&hooks_lock); + hlist_for_each_entry(hook, &table->hooks, list) { + if (hook->ops.dev->ifindex != tuple0->iifidx && + hook->ops.dev->ifindex != tuple1->iifidx) + continue; + + hook->used = true; + } + spin_unlock_bh(&hooks_lock); + + cond_resched(); +} + +static void +xt_flowoffload_hook_work(struct work_struct *work) +{ + struct xt_flowoffload_table *table; + struct xt_flowoffload_hook *hook; + int err; + + table = container_of(work, struct xt_flowoffload_table, work.work); + + spin_lock_bh(&hooks_lock); + xt_flowoffload_register_hooks(table); + hlist_for_each_entry(hook, &table->hooks, list) + hook->used = false; + spin_unlock_bh(&hooks_lock); + + err = nf_flow_table_iterate(&table->ft, xt_flowoffload_check_hook, + table); + if (err && err != -EAGAIN) + goto out; + + if (!xt_flowoffload_cleanup_hooks(table)) + return; + +out: + queue_delayed_work(system_power_efficient_wq, &table->work, HZ); +} + +static bool +xt_flowoffload_skip(struct sk_buff *skb, int family) +{ + if (skb_sec_path(skb)) + return true; + + if (family == NFPROTO_IPV4) { + const struct ip_options *opt = &(IPCB(skb)->opt); + + if (unlikely(opt->optlen)) + return true; + } + + return false; +} + +static bool flow_is_valid_ether_device(const struct net_device *dev) +{ + if (!dev || (dev->flags & IFF_LOOPBACK) || dev->type != ARPHRD_ETHER || + dev->addr_len != ETH_ALEN || !is_valid_ether_addr(dev->dev_addr)) + return false; + + return true; +} + +static void +xt_flowoffload_route_check_path(struct nf_flow_route *route, + const struct nf_conn *ct, + enum ip_conntrack_dir dir, + struct net_device **out_dev) +{ + const struct dst_entry *dst = route->tuple[dir].dst; + const void *daddr = &ct->tuplehash[!dir].tuple.src.u3; + struct net_device_path_stack stack; + enum net_device_path_type prev_type; + struct net_device *dev = dst->dev; + struct neighbour *n; + bool last = false; + u8 nud_state; + int i; + + route->tuple[!dir].in.ifindex = dev->ifindex; + route->tuple[dir].out.ifindex = dev->ifindex; + + if (route->tuple[dir].xmit_type == FLOW_OFFLOAD_XMIT_XFRM) + return; + + if ((dev->flags & IFF_LOOPBACK) || + dev->type != ARPHRD_ETHER || dev->addr_len != ETH_ALEN || + !is_valid_ether_addr(dev->dev_addr)) + return; + + n = dst_neigh_lookup(dst, daddr); + if (!n) + return; + + read_lock_bh(&n->lock); + nud_state = n->nud_state; + memcpy(route->tuple[dir].out.h_dest, n->ha, ETH_ALEN); + read_unlock_bh(&n->lock); + neigh_release(n); + + if (!(nud_state & NUD_VALID)) + return; + + if (dev_fill_forward_path(dev, route->tuple[dir].out.h_dest, &stack) || + !stack.num_paths) + return; + + prev_type = DEV_PATH_ETHERNET; + for (i = 0; i <= stack.num_paths; i++) { + const struct net_device_path *path = &stack.path[i]; + int n_encaps = route->tuple[!dir].in.num_encaps; + + dev = (struct net_device *)path->dev; + if (flow_is_valid_ether_device(dev)) { + if (route->tuple[dir].xmit_type != FLOW_OFFLOAD_XMIT_DIRECT) { + memcpy(route->tuple[dir].out.h_source, + dev->dev_addr, ETH_ALEN); + route->tuple[dir].out.ifindex = dev->ifindex; + } + route->tuple[dir].xmit_type = FLOW_OFFLOAD_XMIT_DIRECT; + } + + switch (path->type) { + case DEV_PATH_PPPOE: + case DEV_PATH_VLAN: + if (n_encaps >= NF_FLOW_TABLE_ENCAP_MAX || + i == stack.num_paths) { + last = true; + break; + } + + route->tuple[!dir].in.num_encaps++; + route->tuple[!dir].in.encap[n_encaps].id = path->encap.id; + route->tuple[!dir].in.encap[n_encaps].proto = path->encap.proto; + if (path->type == DEV_PATH_PPPOE) + memcpy(route->tuple[dir].out.h_dest, + path->encap.h_dest, ETH_ALEN); + break; + case DEV_PATH_BRIDGE: + switch (path->bridge.vlan_mode) { + case DEV_PATH_BR_VLAN_TAG: + if (n_encaps >= NF_FLOW_TABLE_ENCAP_MAX || + i == stack.num_paths) { + last = true; + break; + } + + route->tuple[!dir].in.num_encaps++; + route->tuple[!dir].in.encap[n_encaps].id = + path->bridge.vlan_id; + route->tuple[!dir].in.encap[n_encaps].proto = + path->bridge.vlan_proto; + break; + case DEV_PATH_BR_VLAN_UNTAG: + route->tuple[!dir].in.num_encaps--; + break; + case DEV_PATH_BR_VLAN_UNTAG_HW: + route->tuple[!dir].in.ingress_vlans |= BIT(n_encaps - 1); + break; + case DEV_PATH_BR_VLAN_KEEP: + break; + } + break; + default: + last = true; + break; + } + + if (last) + break; + } + + *out_dev = dev; + route->tuple[dir].out.hw_ifindex = dev->ifindex; + route->tuple[!dir].in.ifindex = dev->ifindex; +} + +static int +xt_flowoffload_route_dir(struct nf_flow_route *route, const struct nf_conn *ct, + enum ip_conntrack_dir dir, + const struct xt_action_param *par, int ifindex) +{ + struct dst_entry *dst = NULL; + struct flowi fl; + + memset(&fl, 0, sizeof(fl)); + switch (xt_family(par)) { + case NFPROTO_IPV4: + fl.u.ip4.daddr = ct->tuplehash[!dir].tuple.src.u3.ip; + fl.u.ip4.flowi4_oif = ifindex; + break; + case NFPROTO_IPV6: + fl.u.ip6.saddr = ct->tuplehash[!dir].tuple.dst.u3.in6; + fl.u.ip6.daddr = ct->tuplehash[!dir].tuple.src.u3.in6; + fl.u.ip6.flowi6_oif = ifindex; + break; + } + + nf_route(xt_net(par), &dst, &fl, false, xt_family(par)); + if (!dst) + return -ENOENT; + + route->tuple[dir].dst = dst; + if (dst_xfrm(dst)) + route->tuple[dir].xmit_type = FLOW_OFFLOAD_XMIT_XFRM; + else + route->tuple[dir].xmit_type = FLOW_OFFLOAD_XMIT_NEIGH; + + return 0; +} + +static int +xt_flowoffload_route(struct sk_buff *skb, const struct nf_conn *ct, + const struct xt_action_param *par, + struct nf_flow_route *route, enum ip_conntrack_dir dir, + struct net_device **dev) +{ + int ret; + + ret = xt_flowoffload_route_dir(route, ct, dir, par, + dev[dir]->ifindex); + if (ret) + return ret; + + ret = xt_flowoffload_route_dir(route, ct, !dir, par, + dev[!dir]->ifindex); + if (ret) + return ret; + + xt_flowoffload_route_check_path(route, ct, dir, &dev[!dir]); + xt_flowoffload_route_check_path(route, ct, !dir, &dev[dir]); + + return 0; +} + +static unsigned int +flowoffload_tg(struct sk_buff *skb, const struct xt_action_param *par) +{ + struct xt_flowoffload_table *table; + const struct xt_flowoffload_target_info *info = par->targinfo; + struct tcphdr _tcph, *tcph = NULL; + enum ip_conntrack_info ctinfo; + enum ip_conntrack_dir dir; + struct nf_flow_route route = {}; + struct flow_offload *flow = NULL; + struct net_device *devs[2] = {}; + struct nf_conn *ct; + struct net *net; + + if (xt_flowoffload_skip(skb, xt_family(par))) + return XT_CONTINUE; + + ct = nf_ct_get(skb, &ctinfo); + if (ct == NULL) + return XT_CONTINUE; + + switch (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum) { + case IPPROTO_TCP: + if (ct->proto.tcp.state != TCP_CONNTRACK_ESTABLISHED) + return XT_CONTINUE; + + tcph = skb_header_pointer(skb, par->thoff, + sizeof(_tcph), &_tcph); + if (unlikely(!tcph || tcph->fin || tcph->rst)) + return XT_CONTINUE; + break; + case IPPROTO_UDP: + break; + default: + return XT_CONTINUE; + } + + if (nf_ct_ext_exist(ct, NF_CT_EXT_HELPER) || + ct->status & IPS_SEQ_ADJUST) + return XT_CONTINUE; + + if (!nf_ct_is_confirmed(ct)) + return XT_CONTINUE; + + devs[dir] = xt_out(par); + devs[!dir] = xt_in(par); + + if (!devs[dir] || !devs[!dir]) + return XT_CONTINUE; + + if (test_and_set_bit(IPS_OFFLOAD_BIT, &ct->status)) + return XT_CONTINUE; + + dir = CTINFO2DIR(ctinfo); + + if (xt_flowoffload_route(skb, ct, par, &route, dir, devs) < 0) + goto err_flow_route; + + flow = flow_offload_alloc(ct); + if (!flow) + goto err_flow_alloc; + + if (flow_offload_route_init(flow, &route) < 0) + goto err_flow_add; + + if (tcph) { + ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL; + ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL; + } + + table = &flowtable[!!(info->flags & XT_FLOWOFFLOAD_HW)]; + if (flow_offload_add(&table->ft, flow) < 0) + goto err_flow_add; + + xt_flowoffload_check_device(table, devs[0]); + xt_flowoffload_check_device(table, devs[1]); + + net = read_pnet(&table->ft.net); + if (!net) + write_pnet(&table->ft.net, xt_net(par)); + + dst_release(route.tuple[dir].dst); + dst_release(route.tuple[!dir].dst); + + return XT_CONTINUE; + +err_flow_add: + flow_offload_free(flow); +err_flow_alloc: + dst_release(route.tuple[dir].dst); + dst_release(route.tuple[!dir].dst); +err_flow_route: + clear_bit(IPS_OFFLOAD_BIT, &ct->status); + + return XT_CONTINUE; +} + +static int flowoffload_chk(const struct xt_tgchk_param *par) +{ + struct xt_flowoffload_target_info *info = par->targinfo; + + if (info->flags & ~XT_FLOWOFFLOAD_MASK) + return -EINVAL; + + return 0; +} + +static struct xt_target offload_tg_reg __read_mostly = { + .family = NFPROTO_UNSPEC, + .name = "FLOWOFFLOAD", + .revision = 0, + .targetsize = sizeof(struct xt_flowoffload_target_info), + .usersize = sizeof(struct xt_flowoffload_target_info), + .checkentry = flowoffload_chk, + .target = flowoffload_tg, + .me = THIS_MODULE, +}; + +static int flow_offload_netdev_event(struct notifier_block *this, + unsigned long event, void *ptr) +{ + struct xt_flowoffload_hook *hook0, *hook1; + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + + if (event != NETDEV_UNREGISTER) + return NOTIFY_DONE; + + spin_lock_bh(&hooks_lock); + hook0 = flow_offload_lookup_hook(&flowtable[0], dev); + if (hook0) + hlist_del(&hook0->list); + + hook1 = flow_offload_lookup_hook(&flowtable[1], dev); + if (hook1) + hlist_del(&hook1->list); + spin_unlock_bh(&hooks_lock); + + if (hook0) { + nf_unregister_net_hook(hook0->net, &hook0->ops); + kfree(hook0); + } + + if (hook1) { + nf_unregister_net_hook(hook1->net, &hook1->ops); + kfree(hook1); + } + + nf_flow_table_cleanup(dev); + + return NOTIFY_DONE; +} + +static struct notifier_block flow_offload_netdev_notifier = { + .notifier_call = flow_offload_netdev_event, +}; + +static unsigned int +nf_flow_offload_inet_hook(void *priv, struct sk_buff *skb, + const struct nf_hook_state *state) +{ + switch (skb->protocol) { + case htons(ETH_P_IP): + return nf_flow_offload_ip_hook(priv, skb, state); + case htons(ETH_P_IPV6): + return nf_flow_offload_ipv6_hook(priv, skb, state); + } + + return NF_ACCEPT; +} + +static int nf_flow_rule_route_inet(struct net *net, + const struct flow_offload *flow, + enum flow_offload_tuple_dir dir, + struct nf_flow_rule *flow_rule) +{ + const struct flow_offload_tuple *flow_tuple = &flow->tuplehash[dir].tuple; + int err; + + switch (flow_tuple->l3proto) { + case NFPROTO_IPV4: + err = nf_flow_rule_route_ipv4(net, flow, dir, flow_rule); + break; + case NFPROTO_IPV6: + err = nf_flow_rule_route_ipv6(net, flow, dir, flow_rule); + break; + default: + err = -1; + break; + } + + return err; +} + +static struct nf_flowtable_type flowtable_inet = { + .family = NFPROTO_INET, + .init = nf_flow_table_init, + .setup = nf_flow_table_offload_setup, + .action = nf_flow_rule_route_inet, + .free = nf_flow_table_free, + .hook = nf_flow_offload_inet_hook, + .owner = THIS_MODULE, +}; + +static int init_flowtable(struct xt_flowoffload_table *tbl) +{ + INIT_DELAYED_WORK(&tbl->work, xt_flowoffload_hook_work); + tbl->ft.type = &flowtable_inet; + + return nf_flow_table_init(&tbl->ft); +} + +static int __init xt_flowoffload_tg_init(void) +{ + int ret; + + register_netdevice_notifier(&flow_offload_netdev_notifier); + + ret = init_flowtable(&flowtable[0]); + if (ret) + return ret; + + ret = init_flowtable(&flowtable[1]); + if (ret) + goto cleanup; + + flowtable[1].ft.flags = NF_FLOWTABLE_HW_OFFLOAD; + + ret = xt_register_target(&offload_tg_reg); + if (ret) + goto cleanup2; + + return 0; + +cleanup2: + nf_flow_table_free(&flowtable[1].ft); +cleanup: + nf_flow_table_free(&flowtable[0].ft); + return ret; +} + +static void __exit xt_flowoffload_tg_exit(void) +{ + xt_unregister_target(&offload_tg_reg); + unregister_netdevice_notifier(&flow_offload_netdev_notifier); + nf_flow_table_free(&flowtable[0].ft); + nf_flow_table_free(&flowtable[1].ft); +} + +MODULE_LICENSE("GPL"); +module_init(xt_flowoffload_tg_init); +module_exit(xt_flowoffload_tg_exit); --- a/net/netfilter/nf_flow_table_core.c +++ b/net/netfilter/nf_flow_table_core.c @@ -7,7 +7,6 @@ #include #include #include -#include #include #include #include @@ -356,8 +355,7 @@ flow_offload_lookup(struct nf_flowtable } EXPORT_SYMBOL_GPL(flow_offload_lookup); -static int -nf_flow_table_iterate(struct nf_flowtable *flow_table, +int nf_flow_table_iterate(struct nf_flowtable *flow_table, void (*iter)(struct flow_offload *flow, void *data), void *data) { @@ -389,6 +387,7 @@ nf_flow_table_iterate(struct nf_flowtabl return err; } +EXPORT_SYMBOL_GPL(nf_flow_table_iterate); static void nf_flow_offload_gc_step(struct flow_offload *flow, void *data) { --- /dev/null +++ b/include/uapi/linux/netfilter/xt_FLOWOFFLOAD.h @@ -0,0 +1,17 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _XT_FLOWOFFLOAD_H +#define _XT_FLOWOFFLOAD_H + +#include + +enum { + XT_FLOWOFFLOAD_HW = 1 << 0, + + XT_FLOWOFFLOAD_MASK = XT_FLOWOFFLOAD_HW +}; + +struct xt_flowoffload_target_info { + __u32 flags; +}; + +#endif /* _XT_FLOWOFFLOAD_H */ --- a/include/net/netfilter/nf_flow_table.h +++ b/include/net/netfilter/nf_flow_table.h @@ -266,6 +266,10 @@ void nf_flow_table_free(struct nf_flowta void flow_offload_teardown(struct flow_offload *flow); +int nf_flow_table_iterate(struct nf_flowtable *flow_table, + void (*iter)(struct flow_offload *flow, void *data), + void *data); + void nf_flow_snat_port(const struct flow_offload *flow, struct sk_buff *skb, unsigned int thoff, u8 protocol, enum flow_offload_tuple_dir dir);