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natflow_path.c
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/*
* Author: Chen Minqiang <ptpt52@gmail.com>
* Date : Mon, 14 May 2018 14:49:40 +0800
*/
#include <linux/ctype.h>
#include <linux/device.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/inetdevice.h>
#include <linux/netfilter.h>
#include <linux/skbuff.h>
#include <linux/string.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/version.h>
#include <linux/netfilter.h>
#include <linux/netfilter_bridge.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_conntrack_acct.h>
#include <linux/if_pppox.h>
#include <linux/ppp_defs.h>
#if (defined(CONFIG_NET_RALINK_OFFLOAD) || defined(NATFLOW_OFFLOAD_HWNAT_FAKE) && defined(CONFIG_NET_MEDIATEK_SOC))
#include <net/netfilter/nf_flow_table.h>
#endif
#include "natflow_common.h"
#include "natflow_path.h"
#include "natflow_user.h"
unsigned int hwnat = 1;
unsigned int delay_pkts = 0;
static int disabled = 1;
void natflow_disabled_set(int v)
{
disabled = v;
}
int natflow_disabled_get(void)
{
return disabled;
}
static unsigned short natflow_path_magic = 0;
void natflow_update_magic(int init)
{
if (init) {
natflow_path_magic = jiffies + prandom_u32();
} else {
natflow_path_magic++;
}
}
#ifdef CONFIG_NETFILTER_INGRESS
static natflow_fastnat_node_t *natflow_fast_nat_table = NULL;
static inline void natflow_update_ct_timeout(struct nf_conn *ct, unsigned long extra_jiffies)
{
if (!nf_ct_is_confirmed(ct)) {
/* nothing to do */
} else {
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0)
extra_jiffies += ct->timeout.expires;
if (extra_jiffies - ct->timeout.expires >= HZ) {
mod_timer_pending(&ct->timeout, extra_jiffies);
}
#else
extra_jiffies += ct->timeout;
ct->timeout = extra_jiffies;
#endif
}
}
static inline natflow_fastnat_node_t *nfn_invert_get(natflow_fastnat_node_t *nfn) {
unsigned int hash;
unsigned long diff_jiffies;
struct nf_conntrack_tuple tuple;
struct nf_conntrack_tuple_hash *h;
memset(&tuple, 0, sizeof(tuple));
tuple.src.u3.ip = nfn->saddr;
tuple.src.u.tcp.port = nfn->source;
tuple.dst.u3.ip = nfn->daddr;
tuple.dst.u.tcp.port = nfn->dest;
tuple.src.l3num = PF_INET;
tuple.dst.protonum = NFN_PROTO_DEC(nfn->flags);
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
h = nf_conntrack_find_get(&init_net, NF_CT_DEFAULT_ZONE, &tuple);
#else
h = nf_conntrack_find_get(&init_net, &nf_ct_zone_dflt, &tuple);
#endif
if (h) {
struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
int d = !NF_CT_DIRECTION(h);
__be32 saddr = ct->tuplehash[d].tuple.src.u3.ip;
__be32 daddr = ct->tuplehash[d].tuple.dst.u3.ip;
__be16 source = ct->tuplehash[d].tuple.src.u.all;
__be16 dest = ct->tuplehash[d].tuple.dst.u.all;
__be16 protonum = ct->tuplehash[d].tuple.dst.protonum;
hash = natflow_hash_v4(saddr, daddr, source, dest);
nfn = &natflow_fast_nat_table[hash];
if (nfn->saddr != saddr || nfn->daddr != daddr || nfn->source != source || nfn->dest != dest || NFN_PROTO_DEC(nfn->flags) != protonum) {
hash += 1;
nfn = &natflow_fast_nat_table[hash];
}
diff_jiffies = ulongmindiff(jiffies, nfn->jiffies);
if (nfn->magic == natflow_path_magic &&
(u32)diff_jiffies < NATFLOW_FF_TIMEOUT_LOW &&
nfn->saddr == saddr && nfn->daddr == daddr && nfn->source == source && nfn->dest == dest && NFN_PROTO_DEC(nfn->flags) == protonum) {
nf_ct_put(ct);
return nfn;
}
nf_ct_put(ct);
}
return NULL;
}
static void natflow_offload_keepalive(unsigned int hash, unsigned long bytes, unsigned long packets, unsigned int *speed_bytes, unsigned int *speed_packets, int hw)
{
struct nf_conn_acct *acct;
natflow_fastnat_node_t *nfn;
unsigned long diff_jiffies = 0;
unsigned long current_jiffies = jiffies;
hash = hash % (NATFLOW_FASTNAT_TABLE_SIZE * 2);
nfn = &natflow_fast_nat_table[hash];
diff_jiffies = ulongmindiff(current_jiffies, nfn->jiffies);
if (nfn->magic == natflow_path_magic && (u32)diff_jiffies < NATFLOW_FF_TIMEOUT_LOW) {
struct nf_conntrack_tuple tuple;
struct nf_conntrack_tuple_hash *h;
nfn->jiffies = current_jiffies;
memset(&tuple, 0, sizeof(tuple));
tuple.src.u3.ip = nfn->saddr;
tuple.src.u.tcp.port = nfn->source;
tuple.dst.u3.ip = nfn->daddr;
tuple.dst.u.tcp.port = nfn->dest;
tuple.src.l3num = PF_INET;
tuple.dst.protonum = NFN_PROTO_DEC(nfn->flags);
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 3, 0)
h = nf_conntrack_find_get(&init_net, NF_CT_DEFAULT_ZONE, &tuple);
#else
h = nf_conntrack_find_get(&init_net, &nf_ct_zone_dflt, &tuple);
#endif
if (h) {
struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
int d = !NF_CT_DIRECTION(h);
__be32 saddr = ct->tuplehash[d].tuple.src.u3.ip;
__be32 daddr = ct->tuplehash[d].tuple.dst.u3.ip;
__be16 source = ct->tuplehash[d].tuple.src.u.all;
__be16 dest = ct->tuplehash[d].tuple.dst.u.all;
__be16 protonum = ct->tuplehash[d].tuple.dst.protonum;
if (d == 1) {
diff_jiffies = ulongmindiff(current_jiffies, nfn->keepalive_jiffies);
nfn->keepalive_jiffies = current_jiffies;
NATFLOW_INFO("keepalive[%u] nfn[%pI4:%u->%pI4:%u] ct%d diff_jiffies=%u HZ=%u bytes=%lu hw=%d\n",
hash, &nfn->saddr, ntohs(nfn->source), &nfn->daddr, ntohs(nfn->dest), !d, (unsigned int)diff_jiffies, HZ, bytes, hw);
natflow_update_ct_timeout(ct, diff_jiffies);
}
hash = natflow_hash_v4(saddr, daddr, source, dest);
nfn = &natflow_fast_nat_table[hash];
if (nfn->saddr != saddr || nfn->daddr != daddr || nfn->source != source || nfn->dest != dest || NFN_PROTO_DEC(nfn->flags) != protonum) {
hash += 1;
nfn = &natflow_fast_nat_table[hash];
}
diff_jiffies = ulongmindiff(current_jiffies, nfn->jiffies);
if ((u32)diff_jiffies < NATFLOW_FF_TIMEOUT_LOW &&
nfn->saddr == saddr && nfn->daddr == daddr && nfn->source == source && nfn->dest == dest && NFN_PROTO_DEC(nfn->flags) == protonum) {
nfn->jiffies = current_jiffies;
if (d == 0) {
diff_jiffies = ulongmindiff(current_jiffies, nfn->keepalive_jiffies);
nfn->keepalive_jiffies = current_jiffies;
NATFLOW_INFO("keepalive[%u] nfn[%pI4:%u->%pI4:%u] ct%d diff_jiffies=%u HZ=%u bytes=%lu hw=%d\n",
hash, &nfn->saddr, ntohs(nfn->source), &nfn->daddr, ntohs(nfn->dest), !d, (unsigned int)diff_jiffies, HZ, bytes, hw);
natflow_update_ct_timeout(ct, diff_jiffies);
}
}
acct = nf_conn_acct_find(ct);
if (acct) {
struct nf_conn_counter *counter = acct->counter;
atomic64_add(packets, &counter[!d].packets);
atomic64_add(bytes, &counter[!d].bytes);
}
/* stats to net_device */
do {
struct natflow_t *nf;
nf = natflow_session_get(ct);
if (nf) {
struct net_device *dev;
dev = nf->rroute[!d].outdev;
#if (defined(CONFIG_NET_RALINK_OFFLOAD) || defined(NATFLOW_OFFLOAD_HWNAT_FAKE) && defined(CONFIG_NET_MEDIATEK_SOC))
if (hw && (((nf->status & NF_FF_ORIGINAL_DSA) && d == NF_FF_DIR_REPLY) ||
((nf->status & NF_FF_REPLY_DSA) && d == NF_FF_DIR_ORIGINAL))) {
struct net_device_stats *stats = &dev->stats;
stats->tx_bytes += bytes;
stats->tx_packets += packets;
}
#endif
if (nf->rroute[!d].vlan_present) {
dev = vlan_lookup_dev(dev, nf->rroute[!d].vlan_tci);
if (dev) {
struct vlan_pcpu_stats *vpstats = this_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats);
u64_stats_update_begin(&vpstats->syncp);
vpstats->tx_bytes += bytes;
vpstats->tx_packets += packets;
u64_stats_update_end(&vpstats->syncp);
}
}
dev = nf->rroute[d].outdev;
#if (defined(CONFIG_NET_RALINK_OFFLOAD) || defined(NATFLOW_OFFLOAD_HWNAT_FAKE) && defined(CONFIG_NET_MEDIATEK_SOC))
if (hw && (((nf->status & NF_FF_ORIGINAL_DSA) && (!d) == NF_FF_DIR_REPLY) ||
((nf->status & NF_FF_REPLY_DSA) && (!d) == NF_FF_DIR_ORIGINAL))) {
struct net_device_stats *stats = &dev->stats;
stats->rx_bytes += bytes;
stats->rx_packets += packets;
}
#endif
if (nf->rroute[d].vlan_present) {
dev = vlan_lookup_dev(dev, nf->rroute[d].vlan_tci);
if (dev) {
struct vlan_pcpu_stats *vpstats = this_cpu_ptr(vlan_dev_priv(dev)->vlan_pcpu_stats);
u64_stats_update_begin(&vpstats->syncp);
vpstats->rx_bytes += bytes;
vpstats->rx_packets += packets;
u64_stats_update_end(&vpstats->syncp);
}
}
}
} while(0);
/* stats to user */
do {
natflow_fakeuser_t *user;
struct fakeuser_data_t *fud;
user = natflow_user_get(ct);
if (NULL == user) {
break;
}
if (user->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip != ct->tuplehash[!d].tuple.src.u3.ip)
d = 0; /* download */
else
d = 1; /* upload */
acct = nf_conn_acct_find(user);
if (acct) {
struct nf_conn_counter *counter = acct->counter;
atomic64_add(packets, &counter[d].packets);
atomic64_add(bytes, &counter[d].bytes);
}
if (!speed_bytes) {
break;
}
fud = natflow_fakeuser_data(user);
current_jiffies = jiffies;
if (d == 0) {
int i = (current_jiffies/HZ) % 4;
int j = (fud->rx_speed_jiffies/HZ) % 4;
int diff = 0;
diff_jiffies = ulongmindiff(jiffies, fud->rx_speed_jiffies);
if (diff_jiffies >= HZ * 4) {
for(j = 0; j < 4; j++) {
atomic_set(&fud->rx_speed_bytes[j], 0);
atomic_set(&fud->rx_speed_packets[j], 0);
}
j = i;
}
for (; j != i; ) {
diff++;
j = (j + 1) % 4;
atomic_set(&fud->rx_speed_bytes[j], speed_bytes[j]);
atomic_set(&fud->rx_speed_packets[j], speed_packets[j]);
speed_bytes[j] = speed_packets[j] = 0;
}
for (; diff < 4; diff++) {
j = (j + 1) % 4;
atomic_add(speed_bytes[j], &fud->rx_speed_bytes[j]);
atomic_add(speed_packets[j], &fud->rx_speed_packets[j]);
speed_bytes[j] = speed_packets[j] = 0;
}
fud->rx_speed_jiffies = current_jiffies;
} else {
int i = (current_jiffies/HZ) % 4;
int j = (fud->tx_speed_jiffies/HZ) % 4;
int diff = 0;
diff_jiffies = ulongmindiff(jiffies, fud->tx_speed_jiffies);
if (diff_jiffies >= HZ * 4) {
for(j = 0; j < 4; j++) {
atomic_set(&fud->tx_speed_bytes[j], 0);
atomic_set(&fud->tx_speed_packets[j], 0);
}
j = i;
}
for (; j != i; ) {
diff++;
j = (j + 1) % 4;
atomic_set(&fud->tx_speed_bytes[j], speed_bytes[j]);
atomic_set(&fud->tx_speed_packets[j], speed_packets[j]);
speed_bytes[j] = speed_packets[j] = 0;
}
for (; diff < 4; diff++) {
j = (j + 1) % 4;
atomic_add(speed_bytes[j], &fud->tx_speed_bytes[j]);
atomic_add(speed_packets[j], &fud->tx_speed_packets[j]);
speed_bytes[j] = speed_packets[j] = 0;
}
fud->tx_speed_jiffies = current_jiffies;
}
} while (0);
nf_ct_put(ct);
return;
}
NATFLOW_INFO("keepalive[%u] nfn[%pI4:%u->%pI4:%u] diff_jiffies=%u ct not found\n",
hash, &nfn->saddr, ntohs(nfn->source), &nfn->daddr, ntohs(nfn->dest), (unsigned int)diff_jiffies);
nfn->jiffies = jiffies - NATFLOW_FF_TIMEOUT_HIGH;
return;
}
NATFLOW_INFO("keepalive[%u] nfn[%pI4:%u->%pI4:%u] diff_jiffies=%u timeout\n",
hash, &nfn->saddr, ntohs(nfn->source), &nfn->daddr, ntohs(nfn->dest), (unsigned int)diff_jiffies);
}
#if (defined(CONFIG_NET_RALINK_OFFLOAD) || defined(NATFLOW_OFFLOAD_HWNAT_FAKE) && defined(CONFIG_NET_MEDIATEK_SOC))
#if defined(NATFLOW_OFFLOAD_HWNAT_FAKE)
#else
typedef struct flow_offload flow_offload_t;
typedef struct flow_offload_tuple flow_offload_tuple_t;
typedef struct flow_offload_hw_path flow_offload_hw_path_t;
typedef enum flow_offload_type flow_offload_type_t;
#endif
struct natflow_offload {
flow_offload_t flow;
};
static struct natflow_offload *natflow_offload_alloc(struct nf_conn *ct, natflow_t *nf)
{
static struct natflow_offload natflow_offload[NR_CPUS];
int dir;
flow_offload_tuple_t *ft;
struct nf_conntrack_tuple *ctt;
struct natflow_offload *natflow = &natflow_offload[smp_processor_id()];
flow_offload_t *flow = &natflow->flow;
int orig_hash, reply_hash;
natflow_fastnat_node_t *nfn;
dir = 0;
ft = &flow->tuplehash[dir].tuple;
ctt = &ct->tuplehash[dir].tuple;
ft->src_v4 = ctt->src.u3.in;
ft->dst_v4 = ctt->dst.u3.in;
ft->l3proto = ctt->src.l3num;
ft->l4proto = ctt->dst.protonum;
ft->src_port = ctt->src.u.tcp.port;
ft->dst_port = ctt->dst.u.tcp.port;
orig_hash = natflow_hash_v4(ft->src_v4.s_addr, ft->dst_v4.s_addr, ft->src_port, ft->dst_port);
nfn = &natflow_fast_nat_table[orig_hash];
if (nfn->saddr != ft->src_v4.s_addr || nfn->daddr != ft->dst_v4.s_addr || nfn->source != ft->src_port || nfn->dest != ft->dst_port || NFN_PROTO_DEC(nfn->flags) != ft->l4proto)
{
orig_hash += 1;
}
dir = 1;
ft = &flow->tuplehash[dir].tuple;
ctt = &ct->tuplehash[dir].tuple;
ft->src_v4 = ctt->src.u3.in;
ft->dst_v4 = ctt->dst.u3.in;
ft->l3proto = ctt->src.l3num;
ft->l4proto = ctt->dst.protonum;
ft->src_port = ctt->src.u.tcp.port;
ft->dst_port = ctt->dst.u.tcp.port;
reply_hash = natflow_hash_v4(ft->src_v4.s_addr, ft->dst_v4.s_addr, ft->src_port, ft->dst_port);
nfn = &natflow_fast_nat_table[reply_hash];
if (nfn->saddr != ft->src_v4.s_addr || nfn->daddr != ft->dst_v4.s_addr || nfn->source != ft->src_port || nfn->dest != ft->dst_port || NFN_PROTO_DEC(nfn->flags) != ft->l4proto)
{
reply_hash += 1;
}
/*XXX: in fact ppe don't care flags */
flow->flags = 0;
if ((void *)flow->priv != (void *)natflow_offload_keepalive) {
flow->priv = (void *)natflow_offload_keepalive;
}
flow->timeout = (orig_hash << 16) | reply_hash;
return natflow;
}
#endif
#endif
void natflow_session_learn(struct sk_buff *skb, struct nf_conn *ct, natflow_t *nf, int dir)
{
int magic = natflow_path_magic;
struct iphdr *iph = ip_hdr(skb);
struct net_device *dev;
if (nf->magic != magic) {
simple_clear_bit(NF_FF_ORIGINAL_CHECK_BIT, &nf->status);
simple_clear_bit(NF_FF_REPLY_OK_BIT, &nf->status);
simple_clear_bit(NF_FF_REPLY_BIT, &nf->status);
simple_clear_bit(NF_FF_REPLY_CHECK_BIT, &nf->status);
simple_clear_bit(NF_FF_ORIGINAL_OK_BIT, &nf->status);
simple_clear_bit(NF_FF_ORIGINAL_BIT, &nf->status);
nf->magic = magic;
}
if (!skb->dev) {
return;
}
dev = get_macvlan_real_dev(skb->dev);
if (dir == IP_CT_DIR_ORIGINAL) {
if (!(nf->status & NF_FF_REPLY) && !simple_test_and_set_bit(NF_FF_REPLY_BIT, &nf->status)) {
void *l2 = (void *)skb_mac_header(skb);
int l2_len = (void *)iph - l2;
if (dev->type == ARPHRD_PPP || dev->type == ARPHRD_NONE) {
l2_len = 0;
}
if (l2_len >= 0 && l2_len <= NF_L2_MAX_LEN) {
nf->rroute[NF_FF_DIR_REPLY].l2_head_len = l2_len;
if (l2_len >= ETH_HLEN) {
memcpy(ETH(nf->rroute[NF_FF_DIR_REPLY].l2_head)->h_source, ETH(l2)->h_dest, ETH_ALEN);
memcpy(ETH(nf->rroute[NF_FF_DIR_REPLY].l2_head)->h_dest, ETH(l2)->h_source, ETH_ALEN);
ETH(nf->rroute[NF_FF_DIR_REPLY].l2_head)->h_proto = ETH(l2)->h_proto;
memcpy(nf->rroute[NF_FF_DIR_REPLY].l2_head + ETH_HLEN, l2 + ETH_HLEN, l2_len - ETH_HLEN);
}
nf->rroute[NF_FF_DIR_REPLY].outdev = dev;
if (skb_vlan_tag_present(skb)) {
nf->rroute[NF_FF_DIR_REPLY].vlan_present = 1;
nf->rroute[NF_FF_DIR_REPLY].vlan_tci = skb_vlan_tag_get_id(skb);
if (skb->vlan_proto == htons(ETH_P_8021Q))
nf->rroute[NF_FF_DIR_REPLY].vlan_proto = FF_ETH_P_8021Q;
else if (skb->vlan_proto == htons(ETH_P_8021AD))
nf->rroute[NF_FF_DIR_REPLY].vlan_proto = FF_ETH_P_8021AD;
}
nf->rroute[NF_FF_DIR_REPLY].ttl_in = ip_hdr(skb)->ttl;
simple_set_bit(NF_FF_REPLY_OK_BIT, &nf->status);
}
}
} else {
if (!(nf->status & NF_FF_ORIGINAL) && !simple_test_and_set_bit(NF_FF_ORIGINAL_BIT, &nf->status)) {
void *l2 = (void *)skb_mac_header(skb);
int l2_len = (void *)iph - l2;
if (dev->type == ARPHRD_PPP || dev->type == ARPHRD_NONE) {
l2_len = 0;
}
if (l2_len >= 0 && l2_len <= NF_L2_MAX_LEN) {
nf->rroute[NF_FF_DIR_ORIGINAL].l2_head_len = l2_len;
if (l2_len >= ETH_HLEN) {
memcpy(ETH(nf->rroute[NF_FF_DIR_ORIGINAL].l2_head)->h_source, ETH(l2)->h_dest, ETH_ALEN);
memcpy(ETH(nf->rroute[NF_FF_DIR_ORIGINAL].l2_head)->h_dest, ETH(l2)->h_source, ETH_ALEN);
ETH(nf->rroute[NF_FF_DIR_ORIGINAL].l2_head)->h_proto = ETH(l2)->h_proto;
memcpy(nf->rroute[NF_FF_DIR_ORIGINAL].l2_head + ETH_HLEN, l2 + ETH_HLEN, l2_len - ETH_HLEN);
}
nf->rroute[NF_FF_DIR_ORIGINAL].outdev = dev;
if (skb_vlan_tag_present(skb)) {
nf->rroute[NF_FF_DIR_ORIGINAL].vlan_present = 1;
nf->rroute[NF_FF_DIR_ORIGINAL].vlan_tci = skb_vlan_tag_get_id(skb);
if (skb->vlan_proto == htons(ETH_P_8021Q))
nf->rroute[NF_FF_DIR_ORIGINAL].vlan_proto = FF_ETH_P_8021Q;
else if (skb->vlan_proto == htons(ETH_P_8021AD))
nf->rroute[NF_FF_DIR_ORIGINAL].vlan_proto = FF_ETH_P_8021AD;
}
nf->rroute[NF_FF_DIR_ORIGINAL].ttl_in = ip_hdr(skb)->ttl;
simple_set_bit(NF_FF_ORIGINAL_OK_BIT, &nf->status);
}
}
}
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
static unsigned int natflow_path_pre_ct_in_hook(unsigned int hooknum,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
#ifdef CONFIG_NETFILTER_INGRESS
u_int8_t pf = PF_INET;
#endif
#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0)
static unsigned int natflow_path_pre_ct_in_hook(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
#ifdef CONFIG_NETFILTER_INGRESS
u_int8_t pf = ops->pf;
#endif
unsigned int hooknum = ops->hooknum;
#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 4, 0)
static unsigned int natflow_path_pre_ct_in_hook(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
#ifdef CONFIG_NETFILTER_INGRESS
u_int8_t pf = state->pf;
#endif
unsigned int hooknum = state->hook;
//const struct net_device *in = state->in;
//const struct net_device *out = state->out;
#else
static unsigned int natflow_path_pre_ct_in_hook(void *priv,
struct sk_buff *skb,
const struct nf_hook_state *state)
{
#ifdef CONFIG_NETFILTER_INGRESS
u_int8_t pf = state->pf;
#endif
unsigned int hooknum = state->hook;
//const struct net_device *in = state->in;
#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0)
//const struct net_device *out = state->out;
#endif
#endif
int dir = 0;
enum ip_conntrack_info ctinfo;
struct nf_conn_acct *acct;
struct nf_conn *ct;
struct iphdr *iph;
void *l4;
natflow_t *nf;
int ret = NF_ACCEPT;
#ifdef CONFIG_NETFILTER_INGRESS
int d;
unsigned int re_learn = 0;
unsigned int ingress_pad_len = 0;
#endif
unsigned int ingress_trim_off = 0;
if (disabled)
return NF_ACCEPT;
#ifdef CONFIG_NETFILTER_INGRESS
if (pf == NFPROTO_NETDEV) {
u32 _I;
u32 hash;
natflow_fastnat_node_t *nfn;
#if (defined(CONFIG_NET_RALINK_OFFLOAD) || defined(NATFLOW_OFFLOAD_HWNAT_FAKE) && defined(CONFIG_NET_MEDIATEK_SOC))
/* XXX: check MTK_CPU_REASON_HIT_BIND_FORCE_CPU
* nated-skb come to cpu from ppe, we just forward to ext dev(Wi-Fi)
* skb->hash stored the hash key
*/
if (hwnat && skb->dev->netdev_ops->ndo_flow_offload &&
(skb->vlan_tci & HWNAT_QUEUE_MAPPING_MAGIC_MASK) == HWNAT_QUEUE_MAPPING_MAGIC &&
(skb->hash & HWNAT_QUEUE_MAPPING_MAGIC_MASK) == HWNAT_QUEUE_MAPPING_MAGIC) {
_I = (skb->hash & HWNAT_QUEUE_MAPPING_HASH_MASK) % (NATFLOW_FASTNAT_TABLE_SIZE * 2);
#if defined(CONFIG_HWNAT_EXTDEV_USE_VLAN_HASH) && !defined(CONFIG_HWNAT_EXTDEV_DISABLED)
if (_I == 0) _I = (skb->vlan_tci & HWNAT_QUEUE_MAPPING_HASH_MASK) % (NATFLOW_FASTNAT_TABLE_SIZE * 2);
#endif
nfn = &natflow_fast_nat_table[_I];
_I = (u32)ulongmindiff(jiffies, nfn->jiffies);
if (nfn->outdev && _I <= NATFLOW_FF_TIMEOUT_LOW && nfn->magic == natflow_path_magic) {
if (!(nfn->flags & FASTNAT_BRIDGE_FWD) && skb_is_gso(skb)) {
if (unlikely(skb_shinfo(skb)->gso_size > nfn->mss)) {
skb_shinfo(skb)->gso_size = nfn->mss;
}
}
//nfn->jiffies = jiffies; /* we update jiffies in keepalive */
#if defined(CONFIG_HWNAT_EXTDEV_USE_VLAN_HASH) && !defined(CONFIG_HWNAT_EXTDEV_DISABLED)
__vlan_hwaccel_clear_tag(skb);
#else
if (skb_vlan_tag_present(skb))
skb->vlan_tci &= ~HWNAT_QUEUE_MAPPING_MAGIC;
#endif
if (skb_is_gso(skb) || (nfn->flags & FASTNAT_NO_ARP)) {
goto fast_output;
}
skb->dev = nfn->outdev;
skb_push(skb, (void *)ip_hdr(skb) - (void *)eth_hdr(skb));
skb_reset_mac_header(skb);
if ((nfn->flags & FASTNAT_PPPOE_FLAG)) {
skb->protocol = __constant_htons(ETH_P_PPP_SES);
}
dev_queue_xmit(skb);
return NF_STOLEN;
}
/* Strict conditions can determine that it is a specially marked skb
* so it is safe to drop
* TODO: del foe
*/
return NF_DROP;
}
#endif
if (unlikely(nf_ct_get(skb, &ctinfo) != NULL))
return NF_ACCEPT;
if (skb->mac_len != ETH_HLEN || skb->pkt_type == PACKET_BROADCAST || skb->pkt_type == PACKET_MULTICAST) {
return NF_ACCEPT;
}
if (skb->protocol == __constant_htons(ETH_P_PPP_SES) &&
pppoe_proto(skb) == __constant_htons(PPP_IP) /* Internet Protocol */) {
ingress_pad_len = PPPOE_SES_HLEN;
} else if (skb->protocol == __constant_htons(ETH_P_IP)) {
ingress_pad_len = 0;
} else {
return NF_ACCEPT;
}
if (ingress_pad_len > 0) {
skb_pull_rcsum(skb, ingress_pad_len);
skb->network_header += ingress_pad_len;
}
if (!pskb_may_pull(skb, sizeof(struct iphdr))) {
return NF_DROP;
}
iph = ip_hdr(skb);
if (iph->ihl < 5 || iph->version != 4 || ip_is_fragment(iph)) {
goto out;
}
_I = ntohs(iph->tot_len);
if (skb->len < _I || _I < (iph->ihl * 4)) {
goto out;
}
if (iph->protocol != IPPROTO_TCP && iph->protocol != IPPROTO_UDP) {
goto out;
}
if (!pskb_may_pull(skb, iph->ihl * 4)) {
return NF_DROP;
}
iph = ip_hdr(skb);
if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) {
return NF_DROP;
}
ingress_trim_off = skb->len - _I;
if (pskb_trim_rcsum(skb, _I)) {
return NF_DROP;
}
iph = ip_hdr(skb);
skb->protocol = __constant_htons(ETH_P_IP);
skb->transport_header = skb->network_header + ip_hdr(skb)->ihl * 4;
#if defined(CONFIG_HWNAT_EXTDEV_USE_VLAN_HASH) && !defined(CONFIG_HWNAT_EXTDEV_DISABLED)
/* XXX:
* MT7622 hwnat cannot handle vlan for ext dev
* Route forwarding: all good
* Bridge forwarding: cannot handle vlan tag packets, pppoe tag is good
*/
if (skb_vlan_tag_present(skb)) {
goto out;
}
#endif
/* skip for defrag-skb or large packets */
if (skb_is_nonlinear(skb) || ntohs(iph->tot_len) > 1500 - ingress_pad_len) {
if (iph->protocol == IPPROTO_UDP || !skb_is_gso(skb))
goto slow_fastpath;
}
if (iph->protocol == IPPROTO_TCP) {
if (!pskb_may_pull(skb, iph->ihl * 4 + sizeof(struct tcphdr)) || skb_try_make_writable(skb, iph->ihl * 4 + sizeof(struct tcphdr))) {
return NF_DROP;
}
iph = ip_hdr(skb);
l4 = (void *)iph + iph->ihl * 4;
_I = natflow_hash_v4(iph->saddr, iph->daddr, TCPH(l4)->source, TCPH(l4)->dest);
nfn = &natflow_fast_nat_table[_I];
if (nfn->saddr != iph->saddr || nfn->daddr != iph->daddr ||
nfn->source != TCPH(l4)->source || nfn->dest != TCPH(l4)->dest ||
!(nfn->flags & FASTNAT_PROTO_TCP)) {
_I += 1;
nfn = &natflow_fast_nat_table[_I];
}
hash = _I;
_I = (u32)ulongmindiff(jiffies, nfn->jiffies);
if (nfn->magic == natflow_path_magic &&
nfn->saddr == iph->saddr && nfn->daddr == iph->daddr &&
nfn->source == TCPH(l4)->source && nfn->dest == TCPH(l4)->dest &&
(nfn->flags & FASTNAT_PROTO_TCP)) {
if (_I > NATFLOW_FF_TIMEOUT_LOW) {
re_learn = 1;
goto slow_fastpath;
}
#if (defined(CONFIG_NET_RALINK_OFFLOAD) || defined(NATFLOW_OFFLOAD_HWNAT_FAKE) && defined(CONFIG_NET_MEDIATEK_SOC))
/* check hnat hw timeout */
if (_I > 14 * HZ && (nfn->flags & FASTNAT_EXT_HWNAT_FLAG)) {
nfn->flags &= ~FASTNAT_EXT_HWNAT_FLAG;
}
#endif
if (unlikely(TCPH(l4)->fin || TCPH(l4)->rst || (u16)skb->dev->ifindex != nfn->ifindex)) {
if ((u16)skb->dev->ifindex != nfn->ifindex)
re_learn = 2;
nfn->jiffies = jiffies - NATFLOW_FF_TIMEOUT_HIGH;
nfn = nfn_invert_get(nfn);
if (nfn && (u32)ulongmindiff(jiffies, nfn->jiffies) <= NATFLOW_FF_TIMEOUT_LOW)
nfn->jiffies = jiffies - NATFLOW_FF_TIMEOUT_HIGH;
/* just in case bridge to make sure conntrack_in */
goto slow_fastpath;
}
nfn->jiffies = jiffies;
/* sample up to slow path every 2s */
if ((u32)ucharmindiff(((nfn->jiffies / HZ) & 0xff), nfn->count) >= NATFLOW_FF_SAMPLE_TIME && !test_and_set_bit(0, &nfn->status)) {
unsigned long bytes = nfn->flow_bytes;
unsigned long packets = nfn->flow_packets;
nfn->flow_bytes -= bytes;
nfn->flow_packets -= packets;
natflow_offload_keepalive(hash, bytes, packets, nfn->speed_bytes, nfn->speed_packets, 0);
nfn->count = (nfn->jiffies / HZ) & 0xff;
wmb();
clear_bit(0, &nfn->status);
goto slow_fastpath;
}
_I = (nfn->jiffies / HZ) % 4;
nfn->speed_bytes[_I] += skb->len;
nfn->speed_packets[_I] += 1;
nfn->flow_bytes += skb->len;
nfn->flow_packets += 1;
if (!(nfn->flags & FASTNAT_BRIDGE_FWD) && skb_is_gso(skb)) {
if (unlikely(skb_shinfo(skb)->gso_size > nfn->mss)) {
skb_shinfo(skb)->gso_size = nfn->mss;
}
}
#if (defined(CONFIG_NET_RALINK_OFFLOAD) || defined(NATFLOW_OFFLOAD_HWNAT_FAKE) && defined(CONFIG_NET_MEDIATEK_SOC))
if ((nfn->flags & FASTNAT_EXT_HWNAT_FLAG)) {
#if defined(CONFIG_HWNAT_EXTDEV_USE_VLAN_HASH) && !defined(CONFIG_HWNAT_EXTDEV_DISABLED)
__vlan_hwaccel_clear_tag(skb);
#else
if (nfn->vlan_present) {
if (nfn->vlan_proto == FF_ETH_P_8021Q)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), nfn->vlan_tci);
else if (nfn->vlan_proto == FF_ETH_P_8021AD)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021AD), nfn->vlan_tci);
} else if (skb_vlan_tag_present(skb))
__vlan_hwaccel_clear_tag(skb);
#endif
skb_push(skb, (void *)ip_hdr(skb) - (void *)eth_hdr(skb));
if (unlikely(ingress_pad_len == PPPOE_SES_HLEN)) {
skb->protocol = __constant_htons(ETH_P_PPP_SES);
}
skb_reset_mac_header(skb);
skb->dev = nfn->outdev;
skb->mark = HWNAT_QUEUE_MAPPING_MAGIC;
skb->hash = HWNAT_QUEUE_MAPPING_MAGIC;
dev_queue_xmit(skb);
return NF_STOLEN;
}
#endif
if (!(nfn->flags & FASTNAT_BRIDGE_FWD)) {
if (iph->ttl <= 1) {
return NF_DROP;
}
ip_decrease_ttl(iph);
}
if (TCPH(l4)->source != nfn->nat_source) {
natflow_nat_port_tcp(skb, iph->ihl * 4, TCPH(l4)->source, nfn->nat_source);
TCPH(l4)->source = nfn->nat_source;
}
if (TCPH(l4)->dest != nfn->nat_dest) {
natflow_nat_port_tcp(skb, iph->ihl * 4, TCPH(l4)->dest, nfn->nat_dest);
TCPH(l4)->dest = nfn->nat_dest;
}
if (iph->saddr != nfn->nat_saddr) {
csum_replace4(&iph->check, iph->saddr, nfn->nat_saddr);
natflow_nat_ip_tcp(skb, iph->ihl * 4, iph->saddr, nfn->nat_saddr);
iph->saddr = nfn->nat_saddr;
}
if (iph->daddr != nfn->nat_daddr) {
csum_replace4(&iph->check, iph->daddr, nfn->nat_daddr);
natflow_nat_ip_tcp(skb, iph->ihl * 4, iph->daddr, nfn->nat_daddr);
iph->daddr = nfn->nat_daddr;
}
fast_output:
_I = ETH_HLEN;
if ((nfn->flags & FASTNAT_PPPOE_FLAG)) {
_I += PPPOE_SES_HLEN;
} else if ((nfn->flags & FASTNAT_NO_ARP)) {
_I = 0;
}
if (skb_is_gso(skb)) {
/* XXX: to xmit gso directly
* 1. hw offload features needed
* 2. hw csum features needed
* 3. ether type only
*/
netdev_features_t features = nfn->outdev->features;
if (nfn->vlan_present)
features = netdev_intersect_features(features,
nfn->outdev->vlan_features | NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_STAG_TX);
ingress_trim_off = (NFN_PROTO_DEC(nfn->flags) == IPPROTO_TCP && (features & NETIF_F_TSO)) && \
(features & (NETIF_F_HW_CSUM | NETIF_F_IP_CSUM)) && \
_I == ETH_HLEN;
if (!ingress_trim_off) {
struct sk_buff *segs;
skb->ip_summed = CHECKSUM_PARTIAL;
skb->dev = nfn->outdev;
segs = skb_gso_segment(skb, 0);
if (IS_ERR(segs)) {
return NF_DROP;
}
consume_skb(skb);
skb = segs;
}
}
do {
struct sk_buff *next = skb->next;
if (_I > skb_headroom(skb) && pskb_expand_head(skb, _I, skb_tailroom(skb), GFP_ATOMIC)) {
kfree_skb_list(skb);
return NF_STOLEN;
}
skb_push(skb, _I);
skb_reset_mac_header(skb);
if (_I >= ETH_HLEN) {
memcpy(eth_hdr(skb)->h_source, nfn->h_source, ETH_ALEN);
memcpy(eth_hdr(skb)->h_dest, nfn->h_dest, ETH_ALEN);
}
if (_I == ETH_HLEN + PPPOE_SES_HLEN) {
struct pppoe_hdr *ph = (struct pppoe_hdr *)((void *)eth_hdr(skb) + ETH_HLEN);
eth_hdr(skb)->h_proto = __constant_htons(ETH_P_PPP_SES);
skb->protocol = __constant_htons(ETH_P_PPP_SES);
ph->ver = 1;
ph->type = 1;
ph->code = 0;
ph->sid = nfn->pppoe_sid;
ph->length = htons(ntohs(ip_hdr(skb)->tot_len) + 2);
*(__be16 *)((void *)ph + sizeof(struct pppoe_hdr)) = __constant_htons(PPP_IP);
} else if (_I == ETH_HLEN) {
eth_hdr(skb)->h_proto = __constant_htons(ETH_P_IP);
}
skb->dev = nfn->outdev;
if (nfn->vlan_present) {
if (nfn->vlan_proto == FF_ETH_P_8021Q)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), nfn->vlan_tci);
else if (nfn->vlan_proto == FF_ETH_P_8021AD)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021AD), nfn->vlan_tci);
} else if (skb_vlan_tag_present(skb))
__vlan_hwaccel_clear_tag(skb);
skb->next = NULL;
dev_queue_xmit(skb);
skb = next;
} while (skb);
return NF_STOLEN;
}
/* for TCP */
} else {
if (!pskb_may_pull(skb, iph->ihl * 4 + sizeof(struct udphdr)) || skb_try_make_writable(skb, iph->ihl * 4 + sizeof(struct udphdr))) {
return NF_DROP;
}
iph = ip_hdr(skb);
l4 = (void *)iph + iph->ihl * 4;
_I = natflow_hash_v4(iph->saddr, iph->daddr, UDPH(l4)->source, UDPH(l4)->dest);
nfn = &natflow_fast_nat_table[_I];
if (nfn->saddr != iph->saddr || nfn->daddr != iph->daddr ||
nfn->source != UDPH(l4)->source || nfn->dest != UDPH(l4)->dest ||
!(nfn->flags & FASTNAT_PROTO_UDP)) {
_I += 1;
nfn = &natflow_fast_nat_table[_I];
}
hash = _I;
_I = (u32)ulongmindiff(jiffies, nfn->jiffies);
if (nfn->magic == natflow_path_magic &&
nfn->saddr == iph->saddr && nfn->daddr == iph->daddr &&
nfn->source == UDPH(l4)->source && nfn->dest == UDPH(l4)->dest &&
(nfn->flags & FASTNAT_PROTO_UDP)) {
if (_I > NATFLOW_FF_TIMEOUT_LOW) {
re_learn = 1;
goto slow_fastpath;
}
#if (defined(CONFIG_NET_RALINK_OFFLOAD) || defined(NATFLOW_OFFLOAD_HWNAT_FAKE) && defined(CONFIG_NET_MEDIATEK_SOC))
/* check hnat hw timeout */
if (_I > 14 * HZ && (nfn->flags & FASTNAT_EXT_HWNAT_FLAG)) {
nfn->flags &= ~FASTNAT_EXT_HWNAT_FLAG;
}
#endif
if (unlikely((u16)skb->dev->ifindex != nfn->ifindex)) {
re_learn = 2;
nfn->jiffies = jiffies - NATFLOW_FF_TIMEOUT_HIGH;
nfn = nfn_invert_get(nfn);
if (nfn && (u32)ulongmindiff(jiffies, nfn->jiffies) <= NATFLOW_FF_TIMEOUT_LOW)
nfn->jiffies = jiffies - NATFLOW_FF_TIMEOUT_HIGH;
/* just in case bridge to make sure conntrack_in */
goto slow_fastpath;
}
nfn->jiffies = jiffies;
/* sample up to slow path every 2s */
if ((u32)ucharmindiff(((nfn->jiffies / HZ) & 0xff), nfn->count) >= NATFLOW_FF_SAMPLE_TIME && !test_and_set_bit(0, &nfn->status)) {
unsigned long bytes = nfn->flow_bytes;
unsigned long packets = nfn->flow_packets;
nfn->flow_bytes -= bytes;
nfn->flow_packets -= packets;
natflow_offload_keepalive(hash, bytes, packets, nfn->speed_bytes, nfn->speed_packets, 0);
nfn->count = (nfn->jiffies / HZ) & 0xff;
wmb();
clear_bit(0, &nfn->status);
goto slow_fastpath;
}
_I = (nfn->jiffies / HZ) % 4;
nfn->speed_bytes[_I] += skb->len;
nfn->speed_packets[_I] += 1;
nfn->flow_bytes += skb->len;
nfn->flow_packets += 1;
#if (defined(CONFIG_NET_RALINK_OFFLOAD) || defined(NATFLOW_OFFLOAD_HWNAT_FAKE) && defined(CONFIG_NET_MEDIATEK_SOC))
if ((nfn->flags & FASTNAT_EXT_HWNAT_FLAG)) {
#if defined(CONFIG_HWNAT_EXTDEV_USE_VLAN_HASH) && !defined(CONFIG_HWNAT_EXTDEV_DISABLED)
__vlan_hwaccel_clear_tag(skb);
#else
if (nfn->vlan_present) {
if (nfn->vlan_proto == FF_ETH_P_8021Q)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), nfn->vlan_tci);
else if (nfn->vlan_proto == FF_ETH_P_8021AD)
__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021AD), nfn->vlan_tci);
} else if (skb_vlan_tag_present(skb))
__vlan_hwaccel_clear_tag(skb);
#endif
skb_push(skb, (void *)ip_hdr(skb) - (void *)eth_hdr(skb));
if (unlikely(ingress_pad_len == PPPOE_SES_HLEN)) {
skb->protocol = __constant_htons(ETH_P_PPP_SES);
}
skb_reset_mac_header(skb);
skb->dev = nfn->outdev;
skb->mark = HWNAT_QUEUE_MAPPING_MAGIC;
skb->hash = HWNAT_QUEUE_MAPPING_MAGIC;
dev_queue_xmit(skb);
return NF_STOLEN;
}
#endif
if (!(nfn->flags & FASTNAT_BRIDGE_FWD)) {
if (iph->ttl <= 1) {
return NF_DROP;
}
ip_decrease_ttl(iph);
}
if (UDPH(l4)->source != nfn->nat_source) {
natflow_nat_port_udp(skb, iph->ihl * 4, UDPH(l4)->source, nfn->nat_source);
UDPH(l4)->source = nfn->nat_source;
}
if (UDPH(l4)->dest != nfn->nat_dest) {
natflow_nat_port_udp(skb, iph->ihl * 4, UDPH(l4)->dest, nfn->nat_dest);
UDPH(l4)->dest = nfn->nat_dest;
}
if (iph->saddr != nfn->nat_saddr) {
csum_replace4(&iph->check, iph->saddr, nfn->nat_saddr);
natflow_nat_ip_udp(skb, iph->ihl * 4, iph->saddr, nfn->nat_saddr);
iph->saddr = nfn->nat_saddr;
}
if (iph->daddr != nfn->nat_daddr) {
csum_replace4(&iph->check, iph->daddr, nfn->nat_daddr);
natflow_nat_ip_udp(skb, iph->ihl * 4, iph->daddr, nfn->nat_daddr);
iph->daddr = nfn->nat_daddr;
}
goto fast_output;
}
/* for UDP */
}
/* fall to slow fastnat path */
slow_fastpath:
ret = nf_conntrack_in_compat(dev_net(skb->dev), PF_INET, NF_INET_PRE_ROUTING, skb);
if (ret != NF_ACCEPT) {
goto out;
}
}
#endif
if (skb->pkt_type == PACKET_BROADCAST || skb->pkt_type == PACKET_MULTICAST)
goto out;
if (skb->protocol != __constant_htons(ETH_P_IP))
goto out;
iph = ip_hdr(skb);
if (iph->protocol != IPPROTO_TCP && iph->protocol != IPPROTO_UDP) {