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netfilter: nf_flow_table: hardware offload support

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This patch adds the dataplane hardware offload to the flowtable
infrastructure. Three new flags represent the hardware state of this
flow:

* FLOW_OFFLOAD_HW: This flow entry resides in the hardware.
* FLOW_OFFLOAD_HW_DYING: This flow entry has been scheduled to be remove
  from hardware. This might be triggered by either packet path (via TCP
  RST/FIN packet) or via aging.
* FLOW_OFFLOAD_HW_DEAD: This flow entry has been already removed from
  the hardware, the software garbage collector can remove it from the
  software flowtable.

This patch supports for:

* IPv4 only.
* Aging via FLOW_CLS_STATS, no packet and byte counter synchronization
  at this stage.

This patch also adds the action callback that specifies how to convert
the flow entry into the flow_rule object that is passed to the driver.

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 2019-11-12 00:29:56 +01:00 committed by David S. Miller
parent 8bb69f3b29
commit c29f74e0df
8 changed files with 822 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/netdevice.h
View File

@ -848,6 +848,7 @@ enum tc_setup_type {
TC_SETUP_ROOT_QDISC,
TC_SETUP_QDISC_GRED,
TC_SETUP_QDISC_TAPRIO,
TC_SETUP_FT,
};
/* These structures hold the attributes of bpf state that are being passed

31
include/net/netfilter/nf_flow_table.h
View File

@ -12,6 +12,9 @@
#include <net/dst.h>
struct nf_flowtable;
struct nf_flow_rule;
struct flow_offload;
enum flow_offload_tuple_dir;
struct nf_flowtable_type {
struct list_head list;
@ -20,6 +23,10 @@ struct nf_flowtable_type {
int (*setup)(struct nf_flowtable *ft,
struct net_device *dev,
enum flow_block_command cmd);
int (*action)(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule);
void (*free)(struct nf_flowtable *ft);
nf_hookfn *hook;
struct module *owner;
@ -80,6 +87,9 @@ struct flow_offload_tuple_rhash {
#define FLOW_OFFLOAD_DNAT 0x2
#define FLOW_OFFLOAD_DYING 0x4
#define FLOW_OFFLOAD_TEARDOWN 0x8
#define FLOW_OFFLOAD_HW 0x10
#define FLOW_OFFLOAD_HW_DYING 0x20
#define FLOW_OFFLOAD_HW_DEAD 0x40
enum flow_offload_type {
NF_FLOW_OFFLOAD_UNSPEC = 0,
@ -142,11 +152,22 @@ unsigned int nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb,
#define MODULE_ALIAS_NF_FLOWTABLE(family) \
MODULE_ALIAS("nf-flowtable-" __stringify(family))
static inline int nf_flow_table_offload_setup(struct nf_flowtable *flowtable,
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);
int nf_flow_table_offload_setup(struct nf_flowtable *flowtable,
struct net_device *dev,
enum flow_block_command cmd)
{
return 0;
}
enum flow_block_command cmd);
int nf_flow_rule_route(struct net *net, const 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);
#endif /* _NF_FLOW_TABLE_H */

1
net/ipv4/netfilter/nf_flow_table_ipv4.c
View File

@ -10,6 +10,7 @@ static struct nf_flowtable_type flowtable_ipv4 = {
.family = NFPROTO_IPV4,
.init = nf_flow_table_init,
.setup = nf_flow_table_offload_setup,
.action = nf_flow_rule_route,
.free = nf_flow_table_free,
.hook = nf_flow_offload_ip_hook,
.owner = THIS_MODULE,

1
net/ipv6/netfilter/nf_flow_table_ipv6.c
View File

@ -11,6 +11,7 @@ static struct nf_flowtable_type flowtable_ipv6 = {
.family = NFPROTO_IPV6,
.init = nf_flow_table_init,
.setup = nf_flow_table_offload_setup,
.action = nf_flow_rule_route,
.free = nf_flow_table_free,
.hook = nf_flow_offload_ipv6_hook,
.owner = THIS_MODULE,

3
net/netfilter/Makefile
View File

@ -120,7 +120,8 @@ obj-$(CONFIG_NFT_FWD_NETDEV) += nft_fwd_netdev.o
# flow table infrastructure
obj-$(CONFIG_NF_FLOW_TABLE) += nf_flow_table.o
nf_flow_table-objs := nf_flow_table_core.o nf_flow_table_ip.o
nf_flow_table-objs := nf_flow_table_core.o nf_flow_table_ip.o \
nf_flow_table_offload.o
obj-$(CONFIG_NF_FLOW_TABLE_INET) += nf_flow_table_inet.o

31
net/netfilter/nf_flow_table_core.c
View File

@ -250,6 +250,9 @@ int flow_offload_add(struct nf_flowtable *flow_table, struct flow_offload *flow)
return err;
}
if (flow_table->flags & NF_FLOWTABLE_HW_OFFLOAD)
nf_flow_offload_add(flow_table, flow);
return 0;
}
EXPORT_SYMBOL_GPL(flow_offload_add);
@ -350,9 +353,20 @@ static void nf_flow_offload_gc_step(struct flow_offload *flow, void *data)
{
struct nf_flowtable *flow_table = data;
if (flow->flags & FLOW_OFFLOAD_HW)
nf_flow_offload_stats(flow_table, flow);
if (nf_flow_has_expired(flow) || nf_ct_is_dying(flow->ct) ||
(flow->flags & (FLOW_OFFLOAD_DYING | FLOW_OFFLOAD_TEARDOWN)))
(flow->flags & (FLOW_OFFLOAD_DYING | FLOW_OFFLOAD_TEARDOWN))) {
if (flow->flags & FLOW_OFFLOAD_HW) {
if (!(flow->flags & FLOW_OFFLOAD_HW_DYING))
nf_flow_offload_del(flow_table, flow);
else if (flow->flags & FLOW_OFFLOAD_HW_DEAD)
flow_offload_del(flow_table, flow);
} else {
flow_offload_del(flow_table, flow);
}
}
}
static void nf_flow_offload_work_gc(struct work_struct *work)
@ -485,6 +499,7 @@ int nf_flow_table_init(struct nf_flowtable *flowtable)
int err;
INIT_DEFERRABLE_WORK(&flowtable->gc_work, nf_flow_offload_work_gc);
flow_block_init(&flowtable->flow_block);
err = rhashtable_init(&flowtable->rhashtable,
&nf_flow_offload_rhash_params);
@ -520,6 +535,7 @@ static void nf_flow_table_do_cleanup(struct flow_offload *flow, void *data)
static void nf_flow_table_iterate_cleanup(struct nf_flowtable *flowtable,
struct net_device *dev)
{
nf_flow_table_offload_flush(flowtable);
nf_flow_table_iterate(flowtable, nf_flow_table_do_cleanup, dev);
flush_delayed_work(&flowtable->gc_work);
}
@ -547,5 +563,18 @@ void nf_flow_table_free(struct nf_flowtable *flow_table)
}
EXPORT_SYMBOL_GPL(nf_flow_table_free);
static int __init nf_flow_table_module_init(void)
{
return nf_flow_table_offload_init();
}
static void __exit nf_flow_table_module_exit(void)
{
nf_flow_table_offload_exit();
}
module_init(nf_flow_table_module_init);
module_exit(nf_flow_table_module_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");

1
net/netfilter/nf_flow_table_inet.c
View File

@ -25,6 +25,7 @@ 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,
.free = nf_flow_table_free,
.hook = nf_flow_offload_inet_hook,
.owner = THIS_MODULE,

758
net/netfilter/nf_flow_table_offload.c Normal file
View File

@ -0,0 +1,758 @@
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netfilter.h>
#include <linux/rhashtable.h>
#include <linux/netdevice.h>
#include <linux/tc_act/tc_csum.h>
#include <net/flow_offload.h>
#include <net/netfilter/nf_flow_table.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_tuple.h>
static struct work_struct nf_flow_offload_work;
static DEFINE_SPINLOCK(flow_offload_pending_list_lock);
static LIST_HEAD(flow_offload_pending_list);
struct flow_offload_work {
struct list_head list;
enum flow_cls_command cmd;
int priority;
struct nf_flowtable *flowtable;
struct flow_offload *flow;
};
struct nf_flow_key {
struct flow_dissector_key_control control;
struct flow_dissector_key_basic basic;
union {
struct flow_dissector_key_ipv4_addrs ipv4;
};
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;
};
#define NF_FLOW_DISSECTOR(__match, __type, __field) \
(__match)->dissector.offset[__type] = \
offsetof(struct nf_flow_key, __field)
static int nf_flow_rule_match(struct nf_flow_match *match,
const struct flow_offload_tuple *tuple)
{
struct nf_flow_key *mask = &match->mask;
struct nf_flow_key *key = &match->key;
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_CONTROL, control);
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_BASIC, basic);
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4);
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_TCP, tcp);
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_PORTS, tp);
switch (tuple->l3proto) {
case AF_INET:
key->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
key->basic.n_proto = htons(ETH_P_IP);
key->ipv4.src = tuple->src_v4.s_addr;
mask->ipv4.src = 0xffffffff;
key->ipv4.dst = tuple->dst_v4.s_addr;
mask->ipv4.dst = 0xffffffff;
break;
default:
return -EOPNOTSUPP;
}
mask->basic.n_proto = 0xffff;
switch (tuple->l4proto) {
case IPPROTO_TCP:
key->tcp.flags = 0;
mask->tcp.flags = TCP_FLAG_RST | TCP_FLAG_FIN;
match->dissector.used_keys |= BIT(FLOW_DISSECTOR_KEY_TCP);
break;
case IPPROTO_UDP:
break;
default:
return -EOPNOTSUPP;
}
key->basic.ip_proto = tuple->l4proto;
mask->basic.ip_proto = 0xff;
key->tp.src = tuple->src_port;
mask->tp.src = 0xffff;
key->tp.dst = tuple->dst_port;
mask->tp.dst = 0xffff;
match->dissector.used_keys |= BIT(FLOW_DISSECTOR_KEY_CONTROL) |
BIT(FLOW_DISSECTOR_KEY_BASIC) |
BIT(FLOW_DISSECTOR_KEY_IPV4_ADDRS) |
BIT(FLOW_DISSECTOR_KEY_PORTS);
return 0;
}
static void flow_offload_mangle(struct flow_action_entry *entry,
enum flow_action_mangle_base htype,
u32 offset, u8 *value, u8 *mask)
{
entry->id = FLOW_ACTION_MANGLE;
entry->mangle.htype = htype;
entry->mangle.offset = offset;
memcpy(&entry->mangle.mask, mask, sizeof(u32));
memcpy(&entry->mangle.val, value, sizeof(u32));
}
static int flow_offload_eth_src(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct flow_action_entry *entry0,
struct flow_action_entry *entry1)
{
const struct flow_offload_tuple *tuple = &flow->tuplehash[!dir].tuple;
struct net_device *dev;
u32 mask, val;
u16 val16;
dev = dev_get_by_index(net, tuple->iifidx);
if (!dev)
return -ENOENT;
mask = ~0xffff0000;
memcpy(&val16, dev->dev_addr, 2);
val = val16 << 16;
flow_offload_mangle(entry0, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 4,
(u8 *)&val, (u8 *)&mask);
mask = ~0xffffffff;
memcpy(&val, dev->dev_addr + 2, 4);
flow_offload_mangle(entry1, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 8,
(u8 *)&val, (u8 *)&mask);
dev_put(dev);
return 0;
}
static int flow_offload_eth_dst(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct flow_action_entry *entry0,
struct flow_action_entry *entry1)
{
const struct flow_offload_tuple *tuple = &flow->tuplehash[dir].tuple;
struct neighbour *n;
u32 mask, val;
u16 val16;
n = dst_neigh_lookup(tuple->dst_cache, &tuple->dst_v4);
if (!n)
return -ENOENT;
mask = ~0xffffffff;
memcpy(&val, n->ha, 4);
flow_offload_mangle(entry0, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 0,
(u8 *)&val, (u8 *)&mask);
mask = ~0x0000ffff;
memcpy(&val16, n->ha + 4, 2);
val = val16;
flow_offload_mangle(entry1, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 4,
(u8 *)&val, (u8 *)&mask);
neigh_release(n);
return 0;
}
static void flow_offload_ipv4_snat(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct flow_action_entry *entry)
{
u32 mask = ~htonl(0xffffffff);
__be32 addr;
u32 offset;
switch (dir) {
case FLOW_OFFLOAD_DIR_ORIGINAL:
addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_v4.s_addr;
offset = offsetof(struct iphdr, saddr);
break;
case FLOW_OFFLOAD_DIR_REPLY:
addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_v4.s_addr;
offset = offsetof(struct iphdr, daddr);
break;
default:
return;
}
flow_offload_mangle(entry, FLOW_ACT_MANGLE_HDR_TYPE_IP4, offset,
(u8 *)&addr, (u8 *)&mask);
}
static void flow_offload_ipv4_dnat(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct flow_action_entry *entry)
{
u32 mask = ~htonl(0xffffffff);
__be32 addr;
u32 offset;
switch (dir) {
case FLOW_OFFLOAD_DIR_ORIGINAL:
addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_v4.s_addr;
offset = offsetof(struct iphdr, daddr);
break;
case FLOW_OFFLOAD_DIR_REPLY:
addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_v4.s_addr;
offset = offsetof(struct iphdr, saddr);
break;
default:
return;
}
flow_offload_mangle(entry, FLOW_ACT_MANGLE_HDR_TYPE_IP4, offset,
(u8 *)&addr, (u8 *)&mask);
}
static int flow_offload_l4proto(const struct flow_offload *flow)
{
u8 protonum = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.l4proto;
u8 type = 0;
switch (protonum) {
case IPPROTO_TCP:
type = FLOW_ACT_MANGLE_HDR_TYPE_TCP;
break;
case IPPROTO_UDP:
type = FLOW_ACT_MANGLE_HDR_TYPE_UDP;
break;
default:
break;
}
return type;
}
static void flow_offload_port_snat(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct flow_action_entry *entry)
{
u32 mask = ~htonl(0xffff0000);
__be16 port;
u32 offset;
switch (dir) {
case FLOW_OFFLOAD_DIR_ORIGINAL:
port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_port;
offset = 0; /* offsetof(struct tcphdr, source); */
break;
case FLOW_OFFLOAD_DIR_REPLY:
port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_port;
offset = 0; /* offsetof(struct tcphdr, dest); */
break;
default:
break;
}
flow_offload_mangle(entry, flow_offload_l4proto(flow), offset,
(u8 *)&port, (u8 *)&mask);
}
static void flow_offload_port_dnat(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct flow_action_entry *entry)
{
u32 mask = ~htonl(0xffff);
__be16 port;
u32 offset;
switch (dir) {
case FLOW_OFFLOAD_DIR_ORIGINAL:
port = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_port;
offset = 0; /* offsetof(struct tcphdr, source); */
break;
case FLOW_OFFLOAD_DIR_REPLY:
port = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_port;
offset = 0; /* offsetof(struct tcphdr, dest); */
break;
default:
break;
}
flow_offload_mangle(entry, flow_offload_l4proto(flow), offset,
(u8 *)&port, (u8 *)&mask);
}
static void flow_offload_ipv4_checksum(struct net *net,
const struct flow_offload *flow,
struct flow_action_entry *entry)
{
u8 protonum = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.l4proto;
entry->id = FLOW_ACTION_CSUM;
entry->csum_flags = TCA_CSUM_UPDATE_FLAG_IPV4HDR;
switch (protonum) {
case IPPROTO_TCP:
entry->csum_flags |= TCA_CSUM_UPDATE_FLAG_TCP;
break;
case IPPROTO_UDP:
entry->csum_flags |= TCA_CSUM_UPDATE_FLAG_UDP;
break;
}
}
static void flow_offload_redirect(const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct flow_action_entry *entry)
{
struct rtable *rt;
rt = (struct rtable *)flow->tuplehash[dir].tuple.dst_cache;
entry->id = FLOW_ACTION_REDIRECT;
entry->dev = rt->dst.dev;
dev_hold(rt->dst.dev);
}
int nf_flow_rule_route(struct net *net, const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
int i;
if (flow_offload_eth_src(net, flow, dir,
&flow_rule->rule->action.entries[0],
&flow_rule->rule->action.entries[1]) < 0)
return -1;
if (flow_offload_eth_dst(net, flow, dir,
&flow_rule->rule->action.entries[2],
&flow_rule->rule->action.entries[3]) < 0)
return -1;
i = 4;
if (flow->flags & FLOW_OFFLOAD_SNAT) {
flow_offload_ipv4_snat(net, flow, dir,
&flow_rule->rule->action.entries[i++]);
flow_offload_port_snat(net, flow, dir,
&flow_rule->rule->action.entries[i++]);
}
if (flow->flags & FLOW_OFFLOAD_DNAT) {
flow_offload_ipv4_dnat(net, flow, dir,
&flow_rule->rule->action.entries[i++]);
flow_offload_port_dnat(net, flow, dir,
&flow_rule->rule->action.entries[i++]);
}
if (flow->flags & FLOW_OFFLOAD_SNAT ||
flow->flags & FLOW_OFFLOAD_DNAT)
flow_offload_ipv4_checksum(net, flow,
&flow_rule->rule->action.entries[i++]);
flow_offload_redirect(flow, dir, &flow_rule->rule->action.entries[i++]);
return i;
}
EXPORT_SYMBOL_GPL(nf_flow_rule_route);
static struct nf_flow_rule *
nf_flow_offload_rule_alloc(struct net *net,
const struct flow_offload_work *offload,
enum flow_offload_tuple_dir dir)
{
const struct nf_flowtable *flowtable = offload->flowtable;
const struct flow_offload *flow = offload->flow;
const struct flow_offload_tuple *tuple;
struct nf_flow_rule *flow_rule;
int err = -ENOMEM, num_actions;
flow_rule = kzalloc(sizeof(*flow_rule), GFP_KERNEL);
if (!flow_rule)
goto err_flow;
flow_rule->rule = flow_rule_alloc(10);
if (!flow_rule->rule)
goto err_flow_rule;
flow_rule->rule->match.dissector = &flow_rule->match.dissector;
flow_rule->rule->match.mask = &flow_rule->match.mask;
flow_rule->rule->match.key = &flow_rule->match.key;
tuple = &flow->tuplehash[dir].tuple;
err = nf_flow_rule_match(&flow_rule->match, tuple);
if (err < 0)
goto err_flow_match;
num_actions = flowtable->type->action(net, flow, dir, flow_rule);
if (num_actions < 0)
goto err_flow_match;
flow_rule->rule->action.num_entries = num_actions;
return flow_rule;
err_flow_match:
kfree(flow_rule->rule);
err_flow_rule:
kfree(flow_rule);
err_flow:
return NULL;
}
static void __nf_flow_offload_destroy(struct nf_flow_rule *flow_rule)
{
struct flow_action_entry *entry;
int i;
for (i = 0; i < flow_rule->rule->action.num_entries; i++) {
entry = &flow_rule->rule->action.entries[i];
if (entry->id != FLOW_ACTION_REDIRECT)
continue;
dev_put(entry->dev);
}
kfree(flow_rule->rule);
kfree(flow_rule);
}
static void nf_flow_offload_destroy(struct nf_flow_rule *flow_rule[])
{
int i;
for (i = 0; i < FLOW_OFFLOAD_DIR_MAX; i++)
__nf_flow_offload_destroy(flow_rule[i]);
}
static int nf_flow_offload_alloc(const struct flow_offload_work *offload,
struct nf_flow_rule *flow_rule[])
{
struct net *net = read_pnet(&offload->flowtable->net);
flow_rule[0] = nf_flow_offload_rule_alloc(net, offload,
FLOW_OFFLOAD_DIR_ORIGINAL);
if (!flow_rule[0])
return -ENOMEM;
flow_rule[1] = nf_flow_offload_rule_alloc(net, offload,
FLOW_OFFLOAD_DIR_REPLY);
if (!flow_rule[1]) {
__nf_flow_offload_destroy(flow_rule[0]);
return -ENOMEM;
}
return 0;
}
static void nf_flow_offload_init(struct flow_cls_offload *cls_flow,
__be16 proto, int priority,
enum flow_cls_command cmd,
const struct flow_offload_tuple *tuple,
struct netlink_ext_ack *extack)
{
cls_flow->common.protocol = proto;
cls_flow->common.prio = priority;
cls_flow->common.extack = extack;
cls_flow->command = cmd;
cls_flow->cookie = (unsigned long)tuple;
}
static int flow_offload_tuple_add(struct flow_offload_work *offload,
struct nf_flow_rule *flow_rule,
enum flow_offload_tuple_dir dir)
{
struct nf_flowtable *flowtable = offload->flowtable;
struct flow_cls_offload cls_flow = {};
struct flow_block_cb *block_cb;
struct netlink_ext_ack extack;
__be16 proto = ETH_P_ALL;
int err, i = 0;
nf_flow_offload_init(&cls_flow, proto, offload->priority,
FLOW_CLS_REPLACE,
&offload->flow->tuplehash[dir].tuple, &extack);
cls_flow.rule = flow_rule->rule;
list_for_each_entry(block_cb, &flowtable->flow_block.cb_list, list) {
err = block_cb->cb(TC_SETUP_FT, &cls_flow,
block_cb->cb_priv);
if (err < 0)
continue;
i++;
}
return i;
}
static void flow_offload_tuple_del(struct flow_offload_work *offload,
enum flow_offload_tuple_dir dir)
{
struct nf_flowtable *flowtable = offload->flowtable;
struct flow_cls_offload cls_flow = {};
struct flow_block_cb *block_cb;
struct netlink_ext_ack extack;
__be16 proto = ETH_P_ALL;
nf_flow_offload_init(&cls_flow, proto, offload->priority,
FLOW_CLS_DESTROY,
&offload->flow->tuplehash[dir].tuple, &extack);
list_for_each_entry(block_cb, &flowtable->flow_block.cb_list, list)
block_cb->cb(TC_SETUP_FT, &cls_flow, block_cb->cb_priv);
offload->flow->flags |= FLOW_OFFLOAD_HW_DEAD;
}
static int flow_offload_rule_add(struct flow_offload_work *offload,
struct nf_flow_rule *flow_rule[])
{
int ok_count = 0;
ok_count += flow_offload_tuple_add(offload, flow_rule[0],
FLOW_OFFLOAD_DIR_ORIGINAL);
ok_count += flow_offload_tuple_add(offload, flow_rule[1],
FLOW_OFFLOAD_DIR_REPLY);
if (ok_count == 0)
return -ENOENT;
return 0;
}
static int flow_offload_work_add(struct flow_offload_work *offload)
{
struct nf_flow_rule *flow_rule[FLOW_OFFLOAD_DIR_MAX];
int err;
err = nf_flow_offload_alloc(offload, flow_rule);
if (err < 0)
return -ENOMEM;
err = flow_offload_rule_add(offload, flow_rule);
nf_flow_offload_destroy(flow_rule);
return err;
}
static void flow_offload_work_del(struct flow_offload_work *offload)
{
flow_offload_tuple_del(offload, FLOW_OFFLOAD_DIR_ORIGINAL);
flow_offload_tuple_del(offload, FLOW_OFFLOAD_DIR_REPLY);
}
static void flow_offload_tuple_stats(struct flow_offload_work *offload,
enum flow_offload_tuple_dir dir,
struct flow_stats *stats)
{
struct nf_flowtable *flowtable = offload->flowtable;
struct flow_cls_offload cls_flow = {};
struct flow_block_cb *block_cb;
struct netlink_ext_ack extack;
__be16 proto = ETH_P_ALL;
nf_flow_offload_init(&cls_flow, proto, offload->priority,
FLOW_CLS_STATS,
&offload->flow->tuplehash[dir].tuple, &extack);
list_for_each_entry(block_cb, &flowtable->flow_block.cb_list, list)
block_cb->cb(TC_SETUP_FT, &cls_flow, block_cb->cb_priv);
memcpy(stats, &cls_flow.stats, sizeof(*stats));
}
static void flow_offload_work_stats(struct flow_offload_work *offload)
{
struct flow_stats stats[FLOW_OFFLOAD_DIR_MAX] = {};
u64 lastused;
flow_offload_tuple_stats(offload, FLOW_OFFLOAD_DIR_ORIGINAL, &stats[0]);
flow_offload_tuple_stats(offload, FLOW_OFFLOAD_DIR_REPLY, &stats[1]);
lastused = max_t(u64, stats[0].lastused, stats[1].lastused);
offload->flow->timeout = max_t(u64, offload->flow->timeout,
lastused + NF_FLOW_TIMEOUT);
}
static void flow_offload_work_handler(struct work_struct *work)
{
struct flow_offload_work *offload, *next;
LIST_HEAD(offload_pending_list);
int ret;
spin_lock_bh(&flow_offload_pending_list_lock);
list_replace_init(&flow_offload_pending_list, &offload_pending_list);
spin_unlock_bh(&flow_offload_pending_list_lock);
list_for_each_entry_safe(offload, next, &offload_pending_list, list) {
switch (offload->cmd) {
case FLOW_CLS_REPLACE:
ret = flow_offload_work_add(offload);
if (ret < 0)
offload->flow->flags &= ~FLOW_OFFLOAD_HW;
break;
case FLOW_CLS_DESTROY:
flow_offload_work_del(offload);
break;
case FLOW_CLS_STATS:
flow_offload_work_stats(offload);
break;
default:
WARN_ON_ONCE(1);
}
list_del(&offload->list);
kfree(offload);
}
}
static void flow_offload_queue_work(struct flow_offload_work *offload)
{
spin_lock_bh(&flow_offload_pending_list_lock);
list_add_tail(&offload->list, &flow_offload_pending_list);
spin_unlock_bh(&flow_offload_pending_list_lock);
schedule_work(&nf_flow_offload_work);
}
void nf_flow_offload_add(struct nf_flowtable *flowtable,
struct flow_offload *flow)
{
struct flow_offload_work *offload;
offload = kmalloc(sizeof(struct flow_offload_work), GFP_ATOMIC);
if (!offload)
return;
offload->cmd = FLOW_CLS_REPLACE;
offload->flow = flow;
offload->priority = flowtable->priority;
offload->flowtable = flowtable;
flow->flags |= FLOW_OFFLOAD_HW;
flow_offload_queue_work(offload);
}
void nf_flow_offload_del(struct nf_flowtable *flowtable,
struct flow_offload *flow)
{
struct flow_offload_work *offload;
offload = kzalloc(sizeof(struct flow_offload_work), GFP_ATOMIC);
if (!offload)
return;
offload->cmd = FLOW_CLS_DESTROY;
offload->flow = flow;
offload->flow->flags |= FLOW_OFFLOAD_HW_DYING;
offload->flowtable = flowtable;
flow_offload_queue_work(offload);
}
void nf_flow_offload_stats(struct nf_flowtable *flowtable,
struct flow_offload *flow)
{
struct flow_offload_work *offload;
s64 delta;
delta = flow->timeout - jiffies;
if ((delta >= (9 * NF_FLOW_TIMEOUT) / 10) ||
flow->flags & FLOW_OFFLOAD_HW_DYING)
return;
offload = kzalloc(sizeof(struct flow_offload_work), GFP_ATOMIC);
if (!offload)
return;
offload->cmd = FLOW_CLS_STATS;
offload->flow = flow;
offload->flowtable = flowtable;
flow_offload_queue_work(offload);
}
void nf_flow_table_offload_flush(struct nf_flowtable *flowtable)
{
if (flowtable->flags & NF_FLOWTABLE_HW_OFFLOAD)
flush_work(&nf_flow_offload_work);
}
static int nf_flow_table_block_setup(struct nf_flowtable *flowtable,
struct flow_block_offload *bo,
enum flow_block_command cmd)
{
struct flow_block_cb *block_cb, *next;
int err = 0;
switch (cmd) {
case FLOW_BLOCK_BIND:
list_splice(&bo->cb_list, &flowtable->flow_block.cb_list);
break;
case FLOW_BLOCK_UNBIND:
list_for_each_entry_safe(block_cb, next, &bo->cb_list, list) {
list_del(&block_cb->list);
flow_block_cb_free(block_cb);
}
break;
default:
WARN_ON_ONCE(1);
err = -EOPNOTSUPP;
}
return err;
}
int nf_flow_table_offload_setup(struct nf_flowtable *flowtable,
struct net_device *dev,
enum flow_block_command cmd)
{
struct netlink_ext_ack extack = {};
struct flow_block_offload bo = {};
int err;
if (!(flowtable->flags & NF_FLOWTABLE_HW_OFFLOAD))
return 0;
bo.net = dev_net(dev);
bo.block = &flowtable->flow_block;
bo.command = cmd;
bo.binder_type = FLOW_BLOCK_BINDER_TYPE_CLSACT_INGRESS;
bo.extack = &extack;
INIT_LIST_HEAD(&bo.cb_list);
err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_BLOCK, &bo);
if (err < 0)
return err;
return nf_flow_table_block_setup(flowtable, &bo, cmd);
}
EXPORT_SYMBOL_GPL(nf_flow_table_offload_setup);
int nf_flow_table_offload_init(void)
{
INIT_WORK(&nf_flow_offload_work, flow_offload_work_handler);
return 0;
}
void nf_flow_table_offload_exit(void)
{
struct flow_offload_work *offload, *next;
LIST_HEAD(offload_pending_list);
cancel_work_sync(&nf_flow_offload_work);
list_for_each_entry_safe(offload, next, &offload_pending_list, list) {
list_del(&offload->list);
kfree(offload);
}
}