summaryrefslogtreecommitdiffstats
path: root/include/net/netfilter/nf_flow_table.h
diff options
context:
space:
mode:
Diffstat (limited to 'include/net/netfilter/nf_flow_table.h')
-rw-r--r--include/net/netfilter/nf_flow_table.h375
1 files changed, 375 insertions, 0 deletions
diff --git a/include/net/netfilter/nf_flow_table.h b/include/net/netfilter/nf_flow_table.h
new file mode 100644
index 000000000..692d59559
--- /dev/null
+++ b/include/net/netfilter/nf_flow_table.h
@@ -0,0 +1,375 @@
+#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 {
+ struct list_head list;
+ struct rhashtable rhashtable;
+ int priority;
+ const struct nf_flowtable_type *type;
+ struct delayed_work gc_work;
+ unsigned int flags;
+ 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,
+ const 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;
+};
+
+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);
+
+#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;
+}
+
+#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 */
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-30 06:12:34 +0000