#ifndef _NF_FLOW_TABLE_H
#define _NF_FLOW_TABLE_H
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/netdevice.h>
#include <linux/rhashtable-types.h>
#include <linux/rcupdate.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_conntrack_tuple_common.h>
#include <net/flow_offload.h>
#include <net/dst.h>
#include <linux/if_pppox.h>
#include <linux/ppp_defs.h>
struct nf_flowtable;
struct nf_flow_rule;
struct flow_offload;
enum flow_offload_tuple_dir;
struct nf_flow_key {
struct flow_dissector_key_meta meta;
struct flow_dissector_key_control control;
struct flow_dissector_key_control enc_control;
struct flow_dissector_key_basic basic;
struct flow_dissector_key_vlan vlan;
struct flow_dissector_key_vlan cvlan;
union {
struct flow_dissector_key_ipv4_addrs ipv4;
struct flow_dissector_key_ipv6_addrs ipv6;
};
struct flow_dissector_key_keyid enc_key_id;
union {
struct flow_dissector_key_ipv4_addrs enc_ipv4;
struct flow_dissector_key_ipv6_addrs enc_ipv6;
};
struct flow_dissector_key_tcp tcp;
struct flow_dissector_key_ports tp;
} __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
struct nf_flow_match {
struct flow_dissector dissector;
struct nf_flow_key key;
struct nf_flow_key mask;
};
struct nf_flow_rule {
struct nf_flow_match match;
struct flow_rule *rule;
};
struct nf_flowtable_type {
struct list_head list;
int family;
int (*init)(struct nf_flowtable *ft);
bool (*gc)(const struct flow_offload *flow);
int (*setup)(struct nf_flowtable *ft,
struct net_device *dev,
enum flow_block_command cmd);
int (*action)(struct net *net,
struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule);
void (*free)(struct nf_flowtable *ft);
void (*get)(struct nf_flowtable *ft);
void (*put)(struct nf_flowtable *ft);
nf_hookfn *hook;
struct module *owner;
};
enum nf_flowtable_flags {
NF_FLOWTABLE_HW_OFFLOAD = 0x1, /* NFT_FLOWTABLE_HW_OFFLOAD */
NF_FLOWTABLE_COUNTER = 0x2, /* NFT_FLOWTABLE_COUNTER */
};
struct nf_flowtable {
unsigned int flags; /* readonly in datapath */
int priority; /* control path (padding hole) */
struct rhashtable rhashtable; /* datapath, read-mostly members come first */
struct list_head list; /* slowpath parts */
const struct nf_flowtable_type *type;
struct delayed_work gc_work;
struct flow_block flow_block;
struct rw_semaphore flow_block_lock; /* Guards flow_block */
possible_net_t net;
};
static inline bool nf_flowtable_hw_offload(struct nf_flowtable *flowtable)
{
return flowtable->flags & NF_FLOWTABLE_HW_OFFLOAD;
}
enum flow_offload_tuple_dir {
FLOW_OFFLOAD_DIR_ORIGINAL = IP_CT_DIR_ORIGINAL,
FLOW_OFFLOAD_DIR_REPLY = IP_CT_DIR_REPLY,
};
#define FLOW_OFFLOAD_DIR_MAX IP_CT_DIR_MAX
enum flow_offload_xmit_type {
FLOW_OFFLOAD_XMIT_UNSPEC = 0,
FLOW_OFFLOAD_XMIT_NEIGH,
FLOW_OFFLOAD_XMIT_XFRM,
FLOW_OFFLOAD_XMIT_DIRECT,
FLOW_OFFLOAD_XMIT_TC,
};
#define NF_FLOW_TABLE_ENCAP_MAX 2
struct flow_offload_tuple {
union {
struct in_addr src_v4;
struct in6_addr src_v6;
};
union {
struct in_addr dst_v4;
struct in6_addr dst_v6;
};
struct {
__be16 src_port;
__be16 dst_port;
};
int iifidx;
u8 l3proto;
u8 l4proto;
struct {
u16 id;
__be16 proto;
} encap[NF_FLOW_TABLE_ENCAP_MAX];
/* All members above are keys for lookups, see flow_offload_hash(). */
struct { } __hash;
u8 dir:2,
xmit_type:3,
encap_num:2,
in_vlan_ingress:2;
u16 mtu;
union {
struct {
struct dst_entry *dst_cache;
u32 dst_cookie;
};
struct {
u32 ifidx;
u32 hw_ifidx;
u8 h_source[ETH_ALEN];
u8 h_dest[ETH_ALEN];
} out;
struct {
u32 iifidx;
} tc;
};
};
struct flow_offload_tuple_rhash {
struct rhash_head node;
struct flow_offload_tuple tuple;
};
enum nf_flow_flags {
NF_FLOW_SNAT,
NF_FLOW_DNAT,
NF_FLOW_TEARDOWN,
NF_FLOW_HW,
NF_FLOW_HW_DYING,
NF_FLOW_HW_DEAD,
NF_FLOW_HW_PENDING,
NF_FLOW_HW_BIDIRECTIONAL,
NF_FLOW_HW_ESTABLISHED,
};
enum flow_offload_type {
NF_FLOW_OFFLOAD_UNSPEC = 0,
NF_FLOW_OFFLOAD_ROUTE,
};
struct flow_offload {
struct flow_offload_tuple_rhash tuplehash[FLOW_OFFLOAD_DIR_MAX];
struct nf_conn *ct;
unsigned long flags;
u16 type;
u32 timeout;
struct rcu_head rcu_head;
};
#define NF_FLOW_TIMEOUT (30 * HZ)
#define nf_flowtable_time_stamp (u32)jiffies
unsigned long flow_offload_get_timeout(struct flow_offload *flow);
static inline __s32 nf_flow_timeout_delta(unsigned int timeout)
{
return (__s32)(timeout - nf_flowtable_time_stamp);
}
struct nf_flow_route {
struct {
struct dst_entry *dst;
struct {
u32 ifindex;
struct {
u16 id;
__be16 proto;
} encap[NF_FLOW_TABLE_ENCAP_MAX];
u8 num_encaps:2,
ingress_vlans:2;
} in;
struct {
u32 ifindex;
u32 hw_ifindex;
u8 h_source[ETH_ALEN];
u8 h_dest[ETH_ALEN];
} out;
enum flow_offload_xmit_type xmit_type;
} tuple[FLOW_OFFLOAD_DIR_MAX];
};
struct flow_offload *flow_offload_alloc(struct nf_conn *ct);
void flow_offload_free(struct flow_offload *flow);
static inline int
nf_flow_table_offload_add_cb(struct nf_flowtable *flow_table,
flow_setup_cb_t *cb, void *cb_priv)
{
struct flow_block *block = &flow_table->flow_block;
struct flow_block_cb *block_cb;
int err = 0;
down_write(&flow_table->flow_block_lock);
block_cb = flow_block_cb_lookup(block, cb, cb_priv);
if (block_cb) {
err = -EEXIST;
goto unlock;
}
block_cb = flow_block_cb_alloc(cb, cb_priv, cb_priv, NULL);
if (IS_ERR(block_cb)) {
err = PTR_ERR(block_cb);
goto unlock;
}
list_add_tail(&block_cb->list, &block->cb_list);
up_write(&flow_table->flow_block_lock);
if (flow_table->type->get)
flow_table->type->get(flow_table);
return 0;
unlock:
up_write(&flow_table->flow_block_lock);
return err;
}
static inline void
nf_flow_table_offload_del_cb(struct nf_flowtable *flow_table,
flow_setup_cb_t *cb, void *cb_priv)
{
struct flow_block *block = &flow_table->flow_block;
struct flow_block_cb *block_cb;
down_write(&flow_table->flow_block_lock);
block_cb = flow_block_cb_lookup(block, cb, cb_priv);
if (block_cb) {
list_del(&block_cb->list);
flow_block_cb_free(block_cb);
} else {
WARN_ON(true);
}
up_write(&flow_table->flow_block_lock);
if (flow_table->type->put)
flow_table->type->put(flow_table);
}
void flow_offload_route_init(struct flow_offload *flow,
struct nf_flow_route *route);
int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow);
void flow_offload_refresh(struct nf_flowtable *flow_table,
struct flow_offload *flow, bool force);
struct flow_offload_tuple_rhash *flow_offload_lookup(struct nf_flowtable *flow_table,
struct flow_offload_tuple *tuple);
void nf_flow_table_gc_run(struct nf_flowtable *flow_table);
void nf_flow_table_gc_cleanup(struct nf_flowtable *flowtable,
struct net_device *dev);
void nf_flow_table_cleanup(struct net_device *dev);
int nf_flow_table_init(struct nf_flowtable *flow_table);
void nf_flow_table_free(struct nf_flowtable *flow_table);
void flow_offload_teardown(struct flow_offload *flow);
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);
void nf_flow_dnat_port(const struct flow_offload *flow,
struct sk_buff *skb, unsigned int thoff,
u8 protocol, enum flow_offload_tuple_dir dir);
struct flow_ports {
__be16 source, dest;
};
struct nf_flowtable *nf_flowtable_by_dev(const struct net_device *dev);
int nf_flow_offload_xdp_setup(struct nf_flowtable *flowtable,
struct net_device *dev,
enum flow_block_command cmd);
unsigned int nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state);
unsigned int nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
const struct nf_hook_state *state);
#if (IS_BUILTIN(CONFIG_NF_FLOW_TABLE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF)) || \
(IS_MODULE(CONFIG_NF_FLOW_TABLE) && IS_ENABLED(CONFIG_DEBUG_INFO_BTF_MODULES))
extern int nf_flow_register_bpf(void);
#else
static inline int nf_flow_register_bpf(void)
{
return 0;
}
#endif
#define MODULE_ALIAS_NF_FLOWTABLE(family) \
MODULE_ALIAS("nf-flowtable-" __stringify(family))
void nf_flow_offload_add(struct nf_flowtable *flowtable,
struct flow_offload *flow);
void nf_flow_offload_del(struct nf_flowtable *flowtable,
struct flow_offload *flow);
void nf_flow_offload_stats(struct nf_flowtable *flowtable,
struct flow_offload *flow);
void nf_flow_table_offload_flush(struct nf_flowtable *flowtable);
void nf_flow_table_offload_flush_cleanup(struct nf_flowtable *flowtable);
int nf_flow_table_offload_setup(struct nf_flowtable *flowtable,
struct net_device *dev,
enum flow_block_command cmd);
int nf_flow_rule_route_ipv4(struct net *net, struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule);
int nf_flow_rule_route_ipv6(struct net *net, struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule);
int nf_flow_table_offload_init(void);
void nf_flow_table_offload_exit(void);
static inline __be16 __nf_flow_pppoe_proto(const struct sk_buff *skb)
{
__be16 proto;
proto = *((__be16 *)(skb_mac_header(skb) + ETH_HLEN +
sizeof(struct pppoe_hdr)));
switch (proto) {
case htons(PPP_IP):
return htons(ETH_P_IP);
case htons(PPP_IPV6):
return htons(ETH_P_IPV6);
}
return 0;
}
static inline bool nf_flow_pppoe_proto(struct sk_buff *skb, __be16 *inner_proto)
{
if (!pskb_may_pull(skb, PPPOE_SES_HLEN))
return false;
*inner_proto = __nf_flow_pppoe_proto(skb);
return true;
}
#define NF_FLOW_TABLE_STAT_INC(net, count) __this_cpu_inc((net)->ft.stat->count)
#define NF_FLOW_TABLE_STAT_DEC(net, count) __this_cpu_dec((net)->ft.stat->count)
#define NF_FLOW_TABLE_STAT_INC_ATOMIC(net, count) \
this_cpu_inc((net)->ft.stat->count)
#define NF_FLOW_TABLE_STAT_DEC_ATOMIC(net, count) \
this_cpu_dec((net)->ft.stat->count)
#ifdef CONFIG_NF_FLOW_TABLE_PROCFS
int nf_flow_table_init_proc(struct net *net);
void nf_flow_table_fini_proc(struct net *net);
#else
static inline int nf_flow_table_init_proc(struct net *net)
{
return 0;
}
static inline void nf_flow_table_fini_proc(struct net *net)
{
}
#endif /* CONFIG_NF_FLOW_TABLE_PROCFS */
#endif /* _NF_FLOW_TABLE_H */
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