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nf_flow_table_offload.c
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nf_flow_table_offload.c
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#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_tables.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_acct.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_tuple.h>
static struct workqueue_struct *nf_flow_offload_add_wq;
static struct workqueue_struct *nf_flow_offload_del_wq;
static struct workqueue_struct *nf_flow_offload_stats_wq;
struct flow_offload_work {
struct list_head list;
enum flow_cls_command cmd;
int priority;
struct nf_flowtable *flowtable;
struct flow_offload *flow;
struct work_struct work;
};
#define NF_FLOW_DISSECTOR(__match, __type, __field) \
(__match)->dissector.offset[__type] = \
offsetof(struct nf_flow_key, __field)
static void nf_flow_rule_lwt_match(struct nf_flow_match *match,
struct ip_tunnel_info *tun_info)
{
struct nf_flow_key *mask = &match->mask;
struct nf_flow_key *key = &match->key;
unsigned int enc_keys;
if (!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX))
return;
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_ENC_CONTROL, enc_control);
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_ENC_KEYID, enc_key_id);
key->enc_key_id.keyid = tunnel_id_to_key32(tun_info->key.tun_id);
mask->enc_key_id.keyid = 0xffffffff;
enc_keys = BIT(FLOW_DISSECTOR_KEY_ENC_KEYID) |
BIT(FLOW_DISSECTOR_KEY_ENC_CONTROL);
if (ip_tunnel_info_af(tun_info) == AF_INET) {
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS,
enc_ipv4);
key->enc_ipv4.src = tun_info->key.u.ipv4.dst;
key->enc_ipv4.dst = tun_info->key.u.ipv4.src;
if (key->enc_ipv4.src)
mask->enc_ipv4.src = 0xffffffff;
if (key->enc_ipv4.dst)
mask->enc_ipv4.dst = 0xffffffff;
enc_keys |= BIT(FLOW_DISSECTOR_KEY_ENC_IPV4_ADDRS);
key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
} else {
memcpy(&key->enc_ipv6.src, &tun_info->key.u.ipv6.dst,
sizeof(struct in6_addr));
memcpy(&key->enc_ipv6.dst, &tun_info->key.u.ipv6.src,
sizeof(struct in6_addr));
if (memcmp(&key->enc_ipv6.src, &in6addr_any,
sizeof(struct in6_addr)))
memset(&key->enc_ipv6.src, 0xff,
sizeof(struct in6_addr));
if (memcmp(&key->enc_ipv6.dst, &in6addr_any,
sizeof(struct in6_addr)))
memset(&key->enc_ipv6.dst, 0xff,
sizeof(struct in6_addr));
enc_keys |= BIT(FLOW_DISSECTOR_KEY_ENC_IPV6_ADDRS);
key->enc_control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
}
match->dissector.used_keys |= enc_keys;
}
static void nf_flow_rule_vlan_match(struct flow_dissector_key_vlan *key,
struct flow_dissector_key_vlan *mask,
u16 vlan_id, __be16 proto)
{
key->vlan_id = vlan_id;
mask->vlan_id = VLAN_VID_MASK;
key->vlan_tpid = proto;
mask->vlan_tpid = 0xffff;
}
static int nf_flow_rule_match(struct nf_flow_match *match,
const struct flow_offload_tuple *tuple,
struct dst_entry *other_dst)
{
struct nf_flow_key *mask = &match->mask;
struct nf_flow_key *key = &match->key;
struct ip_tunnel_info *tun_info;
bool vlan_encap = false;
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_META, meta);
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_IPV6_ADDRS, ipv6);
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_TCP, tcp);
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_PORTS, tp);
if (other_dst && other_dst->lwtstate) {
tun_info = lwt_tun_info(other_dst->lwtstate);
nf_flow_rule_lwt_match(match, tun_info);
}
key->meta.ingress_ifindex = tuple->iifidx;
mask->meta.ingress_ifindex = 0xffffffff;
if (tuple->encap_num > 0 && !(tuple->in_vlan_ingress & BIT(0)) &&
tuple->encap[0].proto == htons(ETH_P_8021Q)) {
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_VLAN, vlan);
nf_flow_rule_vlan_match(&key->vlan, &mask->vlan,
tuple->encap[0].id,
tuple->encap[0].proto);
vlan_encap = true;
}
if (tuple->encap_num > 1 && !(tuple->in_vlan_ingress & BIT(1)) &&
tuple->encap[1].proto == htons(ETH_P_8021Q)) {
if (vlan_encap) {
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_CVLAN,
cvlan);
nf_flow_rule_vlan_match(&key->cvlan, &mask->cvlan,
tuple->encap[1].id,
tuple->encap[1].proto);
} else {
NF_FLOW_DISSECTOR(match, FLOW_DISSECTOR_KEY_VLAN,
vlan);
nf_flow_rule_vlan_match(&key->vlan, &mask->vlan,
tuple->encap[1].id,
tuple->encap[1].proto);
}
}
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;
case AF_INET6:
key->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
key->basic.n_proto = htons(ETH_P_IPV6);
key->ipv6.src = tuple->src_v6;
memset(&mask->ipv6.src, 0xff, sizeof(mask->ipv6.src));
key->ipv6.dst = tuple->dst_v6;
memset(&mask->ipv6.dst, 0xff, sizeof(mask->ipv6.dst));
break;
default:
return -EOPNOTSUPP;
}
mask->control.addr_type = 0xffff;
match->dissector.used_keys |= BIT(key->control.addr_type);
mask->basic.n_proto = 0xffff;
switch (tuple->l4proto) {
case IPPROTO_TCP:
key->tcp.flags = 0;
mask->tcp.flags = cpu_to_be16(be32_to_cpu(TCP_FLAG_RST | TCP_FLAG_FIN) >> 16);
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_META) |
BIT(FLOW_DISSECTOR_KEY_CONTROL) |
BIT(FLOW_DISSECTOR_KEY_BASIC) |
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,
const __be32 *value, const __be32 *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 inline struct flow_action_entry *
flow_action_entry_next(struct nf_flow_rule *flow_rule)
{
int i = flow_rule->rule->action.num_entries++;
return &flow_rule->rule->action.entries[i];
}
static int flow_offload_eth_src(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
struct flow_action_entry *entry0 = flow_action_entry_next(flow_rule);
struct flow_action_entry *entry1 = flow_action_entry_next(flow_rule);
const struct flow_offload_tuple *other_tuple, *this_tuple;
struct net_device *dev = NULL;
const unsigned char *addr;
u32 mask, val;
u16 val16;
this_tuple = &flow->tuplehash[dir].tuple;
switch (this_tuple->xmit_type) {
case FLOW_OFFLOAD_XMIT_DIRECT:
addr = this_tuple->out.h_source;
break;
case FLOW_OFFLOAD_XMIT_NEIGH:
other_tuple = &flow->tuplehash[!dir].tuple;
dev = dev_get_by_index(net, other_tuple->iifidx);
if (!dev)
return -ENOENT;
addr = dev->dev_addr;
break;
default:
return -EOPNOTSUPP;
}
mask = ~0xffff0000;
memcpy(&val16, addr, 2);
val = val16 << 16;
flow_offload_mangle(entry0, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 4,
&val, &mask);
mask = ~0xffffffff;
memcpy(&val, addr + 2, 4);
flow_offload_mangle(entry1, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 8,
&val, &mask);
if (dev)
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 nf_flow_rule *flow_rule)
{
struct flow_action_entry *entry0 = flow_action_entry_next(flow_rule);
struct flow_action_entry *entry1 = flow_action_entry_next(flow_rule);
const struct flow_offload_tuple *other_tuple, *this_tuple;
const struct dst_entry *dst_cache;
unsigned char ha[ETH_ALEN];
struct neighbour *n;
const void *daddr;
u32 mask, val;
u8 nud_state;
u16 val16;
this_tuple = &flow->tuplehash[dir].tuple;
switch (this_tuple->xmit_type) {
case FLOW_OFFLOAD_XMIT_DIRECT:
ether_addr_copy(ha, this_tuple->out.h_dest);
break;
case FLOW_OFFLOAD_XMIT_NEIGH:
other_tuple = &flow->tuplehash[!dir].tuple;
daddr = &other_tuple->src_v4;
dst_cache = this_tuple->dst_cache;
n = dst_neigh_lookup(dst_cache, daddr);
if (!n)
return -ENOENT;
read_lock_bh(&n->lock);
nud_state = n->nud_state;
ether_addr_copy(ha, n->ha);
read_unlock_bh(&n->lock);
neigh_release(n);
if (!(nud_state & NUD_VALID))
return -ENOENT;
break;
default:
return -EOPNOTSUPP;
}
mask = ~0xffffffff;
memcpy(&val, ha, 4);
flow_offload_mangle(entry0, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 0,
&val, &mask);
mask = ~0x0000ffff;
memcpy(&val16, ha + 4, 2);
val = val16;
flow_offload_mangle(entry1, FLOW_ACT_MANGLE_HDR_TYPE_ETH, 4,
&val, &mask);
return 0;
}
static void flow_offload_ipv4_snat(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
struct flow_action_entry *entry = flow_action_entry_next(flow_rule);
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,
&addr, &mask);
}
static void flow_offload_ipv4_dnat(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
struct flow_action_entry *entry = flow_action_entry_next(flow_rule);
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,
&addr, &mask);
}
static void flow_offload_ipv6_mangle(struct nf_flow_rule *flow_rule,
unsigned int offset,
const __be32 *addr, const __be32 *mask)
{
struct flow_action_entry *entry;
int i, j;
for (i = 0, j = 0; i < sizeof(struct in6_addr) / sizeof(u32); i += sizeof(u32), j++) {
entry = flow_action_entry_next(flow_rule);
flow_offload_mangle(entry, FLOW_ACT_MANGLE_HDR_TYPE_IP6,
offset + i, &addr[j], mask);
}
}
static void flow_offload_ipv6_snat(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
u32 mask = ~htonl(0xffffffff);
const __be32 *addr;
u32 offset;
switch (dir) {
case FLOW_OFFLOAD_DIR_ORIGINAL:
addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_v6.s6_addr32;
offset = offsetof(struct ipv6hdr, saddr);
break;
case FLOW_OFFLOAD_DIR_REPLY:
addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_v6.s6_addr32;
offset = offsetof(struct ipv6hdr, daddr);
break;
default:
return;
}
flow_offload_ipv6_mangle(flow_rule, offset, addr, &mask);
}
static void flow_offload_ipv6_dnat(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
u32 mask = ~htonl(0xffffffff);
const __be32 *addr;
u32 offset;
switch (dir) {
case FLOW_OFFLOAD_DIR_ORIGINAL:
addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_v6.s6_addr32;
offset = offsetof(struct ipv6hdr, daddr);
break;
case FLOW_OFFLOAD_DIR_REPLY:
addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_v6.s6_addr32;
offset = offsetof(struct ipv6hdr, saddr);
break;
default:
return;
}
flow_offload_ipv6_mangle(flow_rule, offset, addr, &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 nf_flow_rule *flow_rule)
{
struct flow_action_entry *entry = flow_action_entry_next(flow_rule);
u32 mask, port;
u32 offset;
switch (dir) {
case FLOW_OFFLOAD_DIR_ORIGINAL:
port = ntohs(flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_port);
offset = 0; /* offsetof(struct tcphdr, source); */
port = htonl(port << 16);
mask = ~htonl(0xffff0000);
break;
case FLOW_OFFLOAD_DIR_REPLY:
port = ntohs(flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_port);
offset = 0; /* offsetof(struct tcphdr, dest); */
port = htonl(port);
mask = ~htonl(0xffff);
break;
default:
return;
}
flow_offload_mangle(entry, flow_offload_l4proto(flow), offset,
&port, &mask);
}
static void flow_offload_port_dnat(struct net *net,
const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
struct flow_action_entry *entry = flow_action_entry_next(flow_rule);
u32 mask, port;
u32 offset;
switch (dir) {
case FLOW_OFFLOAD_DIR_ORIGINAL:
port = ntohs(flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_port);
offset = 0; /* offsetof(struct tcphdr, dest); */
port = htonl(port);
mask = ~htonl(0xffff);
break;
case FLOW_OFFLOAD_DIR_REPLY:
port = ntohs(flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_port);
offset = 0; /* offsetof(struct tcphdr, source); */
port = htonl(port << 16);
mask = ~htonl(0xffff0000);
break;
default:
return;
}
flow_offload_mangle(entry, flow_offload_l4proto(flow), offset,
&port, &mask);
}
static void flow_offload_ipv4_checksum(struct net *net,
const struct flow_offload *flow,
struct nf_flow_rule *flow_rule)
{
u8 protonum = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.l4proto;
struct flow_action_entry *entry = flow_action_entry_next(flow_rule);
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(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 *this_tuple, *other_tuple;
struct flow_action_entry *entry;
struct net_device *dev;
int ifindex;
this_tuple = &flow->tuplehash[dir].tuple;
switch (this_tuple->xmit_type) {
case FLOW_OFFLOAD_XMIT_DIRECT:
this_tuple = &flow->tuplehash[dir].tuple;
ifindex = this_tuple->out.hw_ifidx;
break;
case FLOW_OFFLOAD_XMIT_NEIGH:
other_tuple = &flow->tuplehash[!dir].tuple;
ifindex = other_tuple->iifidx;
break;
default:
return;
}
dev = dev_get_by_index(net, ifindex);
if (!dev)
return;
entry = flow_action_entry_next(flow_rule);
entry->id = FLOW_ACTION_REDIRECT;
entry->dev = dev;
}
static void flow_offload_encap_tunnel(const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
const struct flow_offload_tuple *this_tuple;
struct flow_action_entry *entry;
struct dst_entry *dst;
this_tuple = &flow->tuplehash[dir].tuple;
if (this_tuple->xmit_type == FLOW_OFFLOAD_XMIT_DIRECT)
return;
dst = this_tuple->dst_cache;
if (dst && dst->lwtstate) {
struct ip_tunnel_info *tun_info;
tun_info = lwt_tun_info(dst->lwtstate);
if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX)) {
entry = flow_action_entry_next(flow_rule);
entry->id = FLOW_ACTION_TUNNEL_ENCAP;
entry->tunnel = tun_info;
}
}
}
static void flow_offload_decap_tunnel(const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
const struct flow_offload_tuple *other_tuple;
struct flow_action_entry *entry;
struct dst_entry *dst;
other_tuple = &flow->tuplehash[!dir].tuple;
if (other_tuple->xmit_type == FLOW_OFFLOAD_XMIT_DIRECT)
return;
dst = other_tuple->dst_cache;
if (dst && dst->lwtstate) {
struct ip_tunnel_info *tun_info;
tun_info = lwt_tun_info(dst->lwtstate);
if (tun_info && (tun_info->mode & IP_TUNNEL_INFO_TX)) {
entry = flow_action_entry_next(flow_rule);
entry->id = FLOW_ACTION_TUNNEL_DECAP;
}
}
}
static int
nf_flow_rule_route_common(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 *other_tuple;
const struct flow_offload_tuple *tuple;
int i;
flow_offload_decap_tunnel(flow, dir, flow_rule);
flow_offload_encap_tunnel(flow, dir, flow_rule);
if (flow_offload_eth_src(net, flow, dir, flow_rule) < 0 ||
flow_offload_eth_dst(net, flow, dir, flow_rule) < 0)
return -1;
tuple = &flow->tuplehash[dir].tuple;
for (i = 0; i < tuple->encap_num; i++) {
struct flow_action_entry *entry;
if (tuple->in_vlan_ingress & BIT(i))
continue;
if (tuple->encap[i].proto == htons(ETH_P_8021Q)) {
entry = flow_action_entry_next(flow_rule);
entry->id = FLOW_ACTION_VLAN_POP;
}
}
other_tuple = &flow->tuplehash[!dir].tuple;
for (i = 0; i < other_tuple->encap_num; i++) {
struct flow_action_entry *entry;
if (other_tuple->in_vlan_ingress & BIT(i))
continue;
entry = flow_action_entry_next(flow_rule);
switch (other_tuple->encap[i].proto) {
case htons(ETH_P_PPP_SES):
entry->id = FLOW_ACTION_PPPOE_PUSH;
entry->pppoe.sid = other_tuple->encap[i].id;
break;
case htons(ETH_P_8021Q):
entry->id = FLOW_ACTION_VLAN_PUSH;
entry->vlan.vid = other_tuple->encap[i].id;
entry->vlan.proto = other_tuple->encap[i].proto;
break;
}
}
return 0;
}
int nf_flow_rule_route_ipv4(struct net *net, const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
if (nf_flow_rule_route_common(net, flow, dir, flow_rule) < 0)
return -1;
if (test_bit(NF_FLOW_SNAT, &flow->flags)) {
flow_offload_ipv4_snat(net, flow, dir, flow_rule);
flow_offload_port_snat(net, flow, dir, flow_rule);
}
if (test_bit(NF_FLOW_DNAT, &flow->flags)) {
flow_offload_ipv4_dnat(net, flow, dir, flow_rule);
flow_offload_port_dnat(net, flow, dir, flow_rule);
}
if (test_bit(NF_FLOW_SNAT, &flow->flags) ||
test_bit(NF_FLOW_DNAT, &flow->flags))
flow_offload_ipv4_checksum(net, flow, flow_rule);
flow_offload_redirect(net, flow, dir, flow_rule);
return 0;
}
EXPORT_SYMBOL_GPL(nf_flow_rule_route_ipv4);
int nf_flow_rule_route_ipv6(struct net *net, const struct flow_offload *flow,
enum flow_offload_tuple_dir dir,
struct nf_flow_rule *flow_rule)
{
if (nf_flow_rule_route_common(net, flow, dir, flow_rule) < 0)
return -1;
if (test_bit(NF_FLOW_SNAT, &flow->flags)) {
flow_offload_ipv6_snat(net, flow, dir, flow_rule);
flow_offload_port_snat(net, flow, dir, flow_rule);
}
if (test_bit(NF_FLOW_DNAT, &flow->flags)) {
flow_offload_ipv6_dnat(net, flow, dir, flow_rule);
flow_offload_port_dnat(net, flow, dir, flow_rule);
}
flow_offload_redirect(net, flow, dir, flow_rule);
return 0;
}
EXPORT_SYMBOL_GPL(nf_flow_rule_route_ipv6);
#define NF_FLOW_RULE_ACTION_MAX 16
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_tuple *tuple, *other_tuple;
const struct flow_offload *flow = offload->flow;
struct dst_entry *other_dst = NULL;
struct nf_flow_rule *flow_rule;
int err = -ENOMEM;
flow_rule = kzalloc(sizeof(*flow_rule), GFP_KERNEL);
if (!flow_rule)
goto err_flow;
flow_rule->rule = flow_rule_alloc(NF_FLOW_RULE_ACTION_MAX);
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;
other_tuple = &flow->tuplehash[!dir].tuple;
if (other_tuple->xmit_type == FLOW_OFFLOAD_XMIT_NEIGH)
other_dst = other_tuple->dst_cache;
err = nf_flow_rule_match(&flow_rule->match, tuple, other_dst);
if (err < 0)
goto err_flow_match;
flow_rule->rule->action.num_entries = 0;
if (flowtable->type->action(net, flow, dir, flow_rule) < 0)
goto err_flow_match;
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 nf_flow_offload_tuple(struct nf_flowtable *flowtable,
struct flow_offload *flow,
struct nf_flow_rule *flow_rule,
enum flow_offload_tuple_dir dir,
int priority, int cmd,
struct flow_stats *stats,
struct list_head *block_cb_list)
{
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, priority, cmd,
&flow->tuplehash[dir].tuple, &extack);
if (cmd == FLOW_CLS_REPLACE)
cls_flow.rule = flow_rule->rule;
down_read(&flowtable->flow_block_lock);
list_for_each_entry(block_cb, block_cb_list, list) {
err = block_cb->cb(TC_SETUP_CLSFLOWER, &cls_flow,
block_cb->cb_priv);
if (err < 0)
continue;
i++;
}
up_read(&flowtable->flow_block_lock);
if (cmd == FLOW_CLS_STATS)
memcpy(stats, &cls_flow.stats, sizeof(*stats));
return i;
}
static int flow_offload_tuple_add(struct flow_offload_work *offload,
struct nf_flow_rule *flow_rule,
enum flow_offload_tuple_dir dir)
{
return nf_flow_offload_tuple(offload->flowtable, offload->flow,
flow_rule, dir, offload->priority,
FLOW_CLS_REPLACE, NULL,
&offload->flowtable->flow_block.cb_list);
}
static void flow_offload_tuple_del(struct flow_offload_work *offload,
enum flow_offload_tuple_dir dir)
{
nf_flow_offload_tuple(offload->flowtable, offload->flow, NULL, dir,
offload->priority, FLOW_CLS_DESTROY, NULL,
&offload->flowtable->flow_block.cb_list);
}
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 void 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;
err = flow_offload_rule_add(offload, flow_rule);
if (err < 0)
goto out;
set_bit(IPS_HW_OFFLOAD_BIT, &offload->flow->ct->status);
out:
nf_flow_offload_destroy(flow_rule);
}
static void flow_offload_work_del(struct flow_offload_work *offload)
{
clear_bit(IPS_HW_OFFLOAD_BIT, &offload->flow->ct->status);
flow_offload_tuple_del(offload, FLOW_OFFLOAD_DIR_ORIGINAL);
flow_offload_tuple_del(offload, FLOW_OFFLOAD_DIR_REPLY);
set_bit(NF_FLOW_HW_DEAD, &offload->flow->flags);
}
static void flow_offload_tuple_stats(struct flow_offload_work *offload,
enum flow_offload_tuple_dir dir,
struct flow_stats *stats)
{
nf_flow_offload_tuple(offload->flowtable, offload->flow, NULL, dir,
offload->priority, FLOW_CLS_STATS, stats,
&offload->flowtable->flow_block.cb_list);
}
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 + flow_offload_get_timeout(offload->flow));
if (offload->flowtable->flags & NF_FLOWTABLE_COUNTER) {
if (stats[0].pkts)
nf_ct_acct_add(offload->flow->ct,
FLOW_OFFLOAD_DIR_ORIGINAL,
stats[0].pkts, stats[0].bytes);
if (stats[1].pkts)
nf_ct_acct_add(offload->flow->ct,
FLOW_OFFLOAD_DIR_REPLY,
stats[1].pkts, stats[1].bytes);
}
}
static void flow_offload_work_handler(struct work_struct *work)
{
struct flow_offload_work *offload;
offload = container_of(work, struct flow_offload_work, work);
switch (offload->cmd) {
case FLOW_CLS_REPLACE:
flow_offload_work_add(offload);
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);
}
clear_bit(NF_FLOW_HW_PENDING, &offload->flow->flags);
kfree(offload);
}
static void flow_offload_queue_work(struct flow_offload_work *offload)
{
if (offload->cmd == FLOW_CLS_REPLACE)
queue_work(nf_flow_offload_add_wq, &offload->work);
else if (offload->cmd == FLOW_CLS_DESTROY)
queue_work(nf_flow_offload_del_wq, &offload->work);
else
queue_work(nf_flow_offload_stats_wq, &offload->work);
}
static struct flow_offload_work *
nf_flow_offload_work_alloc(struct nf_flowtable *flowtable,
struct flow_offload *flow, unsigned int cmd)
{
struct flow_offload_work *offload;
if (test_and_set_bit(NF_FLOW_HW_PENDING, &flow->flags))
return NULL;
offload = kmalloc(sizeof(struct flow_offload_work), GFP_ATOMIC);
if (!offload) {
clear_bit(NF_FLOW_HW_PENDING, &flow->flags);
return NULL;
}