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netfilter: nf_tables: add hardware offload support

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This patch adds hardware offload support for nftables through the
existing netdev_ops->ndo_setup_tc() interface, the TC_SETUP_CLSFLOWER
classifier and the flow rule API. This hardware offload support is
available for the NFPROTO_NETDEV family and the ingress hook.

Each nftables expression has a new ->offload interface, that is used to
populate the flow rule object that is attached to the transaction
object.

There is a new per-table NFT_TABLE_F_HW flag, that is set on to offload
an entire table, including all of its chains.

This patch supports for basic metadata (layer 3 and 4 protocol numbers),
5-tuple payload matching and the accept/drop actions; this also includes
basechain hardware offload only.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pablo Neira Ayuso
2019-07-09 23:00:43 +02:00
committed by David S. Miller
parent f9e30088d2
commit c9626a2cbd
10 changed files with 691 additions and 7 deletions
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14
include/net/netfilter/nf_tables.h
View File

@@ -161,6 +161,7 @@ struct nft_ctx {
const struct nlattr * const *nla;
u32 portid;
u32 seq;
u16 flags;
u8 family;
u8 level;
bool report;
@@ -735,6 +736,9 @@ enum nft_trans_phase {
NFT_TRANS_RELEASE
};
struct nft_flow_rule;
struct nft_offload_ctx;
/**
* struct nft_expr_ops - nf_tables expression operations
*
@@ -777,6 +781,10 @@ struct nft_expr_ops {
const struct nft_data **data);
bool (*gc)(struct net *net,
const struct nft_expr *expr);
int (*offload)(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
const struct nft_expr *expr);
u32 offload_flags;
const struct nft_expr_type *type;
void *data;
};
@@ -859,6 +867,7 @@ static inline struct nft_userdata *nft_userdata(const struct nft_rule *rule)
enum nft_chain_flags {
NFT_BASE_CHAIN = 0x1,
NFT_CHAIN_HW_OFFLOAD = 0x2,
};
/**
@@ -942,6 +951,7 @@ struct nft_stats {
* @stats: per-cpu chain stats
* @chain: the chain
* @dev_name: device name that this base chain is attached to (if any)
* @cb_list: list of flow block callbacks (for hardware offload)
*/
struct nft_base_chain {
struct nf_hook_ops ops;
@@ -951,6 +961,7 @@ struct nft_base_chain {
struct nft_stats __percpu *stats;
struct nft_chain chain;
char dev_name[IFNAMSIZ];
struct list_head cb_list;
};
static inline struct nft_base_chain *nft_base_chain(const struct nft_chain *chain)
@@ -1322,11 +1333,14 @@ struct nft_trans {
struct nft_trans_rule {
struct nft_rule *rule;
struct nft_flow_rule *flow;
u32 rule_id;
};
#define nft_trans_rule(trans) \
(((struct nft_trans_rule *)trans->data)->rule)
#define nft_trans_flow_rule(trans) \
(((struct nft_trans_rule *)trans->data)->flow)
#define nft_trans_rule_id(trans) \
(((struct nft_trans_rule *)trans->data)->rule_id)

76
include/net/netfilter/nf_tables_offload.h Normal file
View File

@@ -0,0 +1,76 @@
#ifndef _NET_NF_TABLES_OFFLOAD_H
#define _NET_NF_TABLES_OFFLOAD_H
#include <net/flow_offload.h>
#include <net/netfilter/nf_tables.h>
struct nft_offload_reg {
u32 key;
u32 len;
u32 base_offset;
u32 offset;
struct nft_data mask;
};
enum nft_offload_dep_type {
NFT_OFFLOAD_DEP_UNSPEC = 0,
NFT_OFFLOAD_DEP_NETWORK,
NFT_OFFLOAD_DEP_TRANSPORT,
};
struct nft_offload_ctx {
struct {
enum nft_offload_dep_type type;
__be16 l3num;
u8 protonum;
} dep;
unsigned int num_actions;
struct nft_offload_reg regs[NFT_REG32_15 + 1];
};
void nft_offload_set_dependency(struct nft_offload_ctx *ctx,
enum nft_offload_dep_type type);
void nft_offload_update_dependency(struct nft_offload_ctx *ctx,
const void *data, u32 len);
struct nft_flow_key {
struct flow_dissector_key_basic basic;
union {
struct flow_dissector_key_ipv4_addrs ipv4;
struct flow_dissector_key_ipv6_addrs ipv6;
};
struct flow_dissector_key_ports tp;
struct flow_dissector_key_ip ip;
struct flow_dissector_key_vlan vlan;
struct flow_dissector_key_eth_addrs eth_addrs;
} __aligned(BITS_PER_LONG / 8); /* Ensure that we can do comparisons as longs. */
struct nft_flow_match {
struct flow_dissector dissector;
struct nft_flow_key key;
struct nft_flow_key mask;
};
struct nft_flow_rule {
__be16 proto;
struct nft_flow_match match;
struct flow_rule *rule;
};
#define NFT_OFFLOAD_F_ACTION (1 << 0)
struct nft_rule;
struct nft_flow_rule *nft_flow_rule_create(const struct nft_rule *rule);
void nft_flow_rule_destroy(struct nft_flow_rule *flow);
int nft_flow_rule_offload_commit(struct net *net);
#define NFT_OFFLOAD_MATCH(__key, __base, __field, __len, __reg) \
(__reg)->base_offset = \
offsetof(struct nft_flow_key, __base); \
(__reg)->offset = \
offsetof(struct nft_flow_key, __base.__field); \
(__reg)->len = __len; \
(__reg)->key = __key; \
memset(&(__reg)->mask, 0xff, (__reg)->len);
#endif