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nest-open-source / manifest_repos / sdk / 6a1507de03e5575cec9b8f2dea709f3ed9b81426 / . / qca-nss-sfe / sfe_ipv4.c
blob: 1fd28835231d7385abdfaaf37562977d08ee36ec [file] [log] [blame]
/*
* sfe_ipv4.c
* Shortcut forwarding engine - IPv4 edition.
*
* Copyright (c) 2013-2016, 2019-2020, The Linux Foundation. All rights reserved.
* Copyright (c) 2022 Qualcomm Innovation Center, Inc. All rights reserved.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <linux/module.h>
#include <linux/sysfs.h>
#include <linux/skbuff.h>
#include <linux/icmp.h>
#include <net/tcp.h>
#include <net/udp.h>
#include <net/vxlan.h>
#include <linux/etherdevice.h>
#include <linux/version.h>
#include <linux/lockdep.h>
#include <linux/refcount.h>
#include <linux/netfilter.h>
#include <linux/inetdevice.h>
#include <linux/netfilter_ipv4.h>
#include <net/protocol.h>
#include <net/gre.h>
#include "sfe_debug.h"
#include "sfe_api.h"
#include "sfe.h"
#include "sfe_flow_cookie.h"
#include "sfe_ipv4.h"
#include "sfe_ipv4_udp.h"
#include "sfe_ipv4_tcp.h"
#include "sfe_ipv4_icmp.h"
#include "sfe_pppoe.h"
#include "sfe_ipv4_gre.h"
static char *sfe_ipv4_exception_events_string[SFE_IPV4_EXCEPTION_EVENT_LAST] = {
"UDP_HEADER_INCOMPLETE",
"UDP_NO_CONNECTION",
"UDP_IP_OPTIONS_OR_INITIAL_FRAGMENT",
"UDP_SMALL_TTL",
"UDP_NEEDS_FRAGMENTATION",
"TCP_HEADER_INCOMPLETE",
"TCP_NO_CONNECTION_SLOW_FLAGS",
"TCP_NO_CONNECTION_FAST_FLAGS",
"TCP_IP_OPTIONS_OR_INITIAL_FRAGMENT",
"TCP_SMALL_TTL",
"TCP_NEEDS_FRAGMENTATION",
"TCP_FLAGS",
"TCP_SEQ_EXCEEDS_RIGHT_EDGE",
"TCP_SMALL_DATA_OFFS",
"TCP_BAD_SACK",
"TCP_BIG_DATA_OFFS",
"TCP_SEQ_BEFORE_LEFT_EDGE",
"TCP_ACK_EXCEEDS_RIGHT_EDGE",
"TCP_ACK_BEFORE_LEFT_EDGE",
"ICMP_HEADER_INCOMPLETE",
"ICMP_UNHANDLED_TYPE",
"ICMP_IPV4_HEADER_INCOMPLETE",
"ICMP_IPV4_NON_V4",
"ICMP_IPV4_IP_OPTIONS_INCOMPLETE",
"ICMP_IPV4_UDP_HEADER_INCOMPLETE",
"ICMP_IPV4_TCP_HEADER_INCOMPLETE",
"ICMP_IPV4_UNHANDLED_PROTOCOL",
"ICMP_NO_CONNECTION",
"ICMP_FLUSHED_CONNECTION",
"HEADER_INCOMPLETE",
"HEADER_CSUM_BAD",
"BAD_TOTAL_LENGTH",
"NON_V4",
"NON_INITIAL_FRAGMENT",
"DATAGRAM_INCOMPLETE",
"IP_OPTIONS_INCOMPLETE",
"UNHANDLED_PROTOCOL",
"NO_HEADROOM",
"INVALID_PPPOE_SESSION",
"INCORRECT_PPPOE_PARSING",
"PPPOE_NOT_SET_IN_CME",
"INGRESS_VLAN_TAG_MISMATCH",
"INVALID_SOURCE_INTERFACE",
"GRE_HEADER_INCOMPLETE",
"GRE_NO_CONNECTION",
"GRE_IP_OPTIONS_OR_INITIAL_FRAGMENT",
"GRE_SMALL_TTL",
"GRE_NEEDS_FRAGMENTATION"
};
static struct sfe_ipv4 __si;
/*
* sfe_ipv4_gen_ip_csum()
* Generate the IP checksum for an IPv4 header.
*
* Note that this function assumes that we have only 20 bytes of IP header.
*/
u16 sfe_ipv4_gen_ip_csum(struct iphdr *iph)
{
u32 sum;
u16 *i = (u16 *)iph;
iph->check = 0;
/*
* Generate the sum.
*/
sum = i[0] + i[1] + i[2] + i[3] + i[4] + i[5] + i[6] + i[7] + i[8] + i[9];
/*
* Fold it to ones-complement form.
*/
sum = (sum & 0xffff) + (sum >> 16);
sum = (sum & 0xffff) + (sum >> 16);
return (u16)sum ^ 0xffff;
}
/*
* sfe_ipv4_get_connection_match_hash()
* Generate the hash used in connection match lookups.
*/
static inline unsigned int sfe_ipv4_get_connection_match_hash(struct net_device *dev, u8 protocol,
__be32 src_ip, __be16 src_port,
__be32 dest_ip, __be16 dest_port)
{
u32 hash = ntohl(src_ip ^ dest_ip) ^ protocol ^ ntohs(src_port ^ dest_port);
return ((hash >> SFE_IPV4_CONNECTION_HASH_SHIFT) ^ hash) & SFE_IPV4_CONNECTION_HASH_MASK;
}
/*
* sfe_ipv4_find_connection_match_rcu()
* Get the IPv4 flow match info that corresponds to a particular 5-tuple.
*
* On entry we must be holding the lock that protects the hash table.
*/
struct sfe_ipv4_connection_match *
sfe_ipv4_find_connection_match_rcu(struct sfe_ipv4 *si, struct net_device *dev, u8 protocol,
__be32 src_ip, __be16 src_port,
__be32 dest_ip, __be16 dest_port)
{
struct sfe_ipv4_connection_match *cm = NULL;
unsigned int conn_match_idx;
struct hlist_head *lhead;
WARN_ON_ONCE(!rcu_read_lock_held());
conn_match_idx = sfe_ipv4_get_connection_match_hash(dev, protocol, src_ip, src_port, dest_ip, dest_port);
lhead = &si->hlist_conn_match_hash_head[conn_match_idx];
hlist_for_each_entry_rcu(cm, lhead, hnode) {
if (cm->match_src_port != src_port
|| cm->match_dest_port != dest_port
|| cm->match_src_ip != src_ip
|| cm->match_dest_ip != dest_ip
|| cm->match_protocol != protocol) {
continue;
}
this_cpu_inc(si->stats_pcpu->connection_match_hash_hits64);
break;
}
return cm;
}
/*
* sfe_ipv4_connection_match_update_summary_stats()
* Update the summary stats for a connection match entry.
*
* Stats are incremented atomically. So use atomic substraction to update summary
* stats.
*/
static inline void sfe_ipv4_connection_match_update_summary_stats(struct sfe_ipv4_connection_match *cm,
u32 *packets, u32 *bytes)
{
u32 packet_count, byte_count;
packet_count = atomic_read(&cm->rx_packet_count);
cm->rx_packet_count64 += packet_count;
atomic_sub(packet_count, &cm->rx_packet_count);
byte_count = atomic_read(&cm->rx_byte_count);
cm->rx_byte_count64 += byte_count;
atomic_sub(byte_count, &cm->rx_byte_count);
*packets = packet_count;
*bytes = byte_count;
}
/*
* sfe_ipv4_connection_match_compute_translations()
* Compute port and address translations for a connection match entry.
*/
static void sfe_ipv4_connection_match_compute_translations(struct sfe_ipv4_connection_match *cm)
{
/*
* Before we insert the entry look to see if this is tagged as doing address
* translations. If it is then work out the adjustment that we need to apply
* to the transport checksum.
*/
if (cm->flags & SFE_IPV4_CONNECTION_MATCH_FLAG_XLATE_SRC) {
/*
* Precompute an incremental checksum adjustment so we can
* edit packets in this stream very quickly. The algorithm is from RFC1624.
*/
u16 src_ip_hi = cm->match_src_ip >> 16;
u16 src_ip_lo = cm->match_src_ip & 0xffff;
u32 xlate_src_ip = ~cm->xlate_src_ip;
u16 xlate_src_ip_hi = xlate_src_ip >> 16;
u16 xlate_src_ip_lo = xlate_src_ip & 0xffff;
u16 xlate_src_port = ~cm->xlate_src_port;
u32 adj;
/*
* When we compute this fold it down to a 16-bit offset
* as that way we can avoid having to do a double
* folding of the twos-complement result because the
* addition of 2 16-bit values cannot cause a double
* wrap-around!
*/
adj = src_ip_hi + src_ip_lo + cm->match_src_port
+ xlate_src_ip_hi + xlate_src_ip_lo + xlate_src_port;
adj = (adj & 0xffff) + (adj >> 16);
adj = (adj & 0xffff) + (adj >> 16);
cm->xlate_src_csum_adjustment = (u16)adj;
}
if (cm->flags & SFE_IPV4_CONNECTION_MATCH_FLAG_XLATE_DEST) {
/*
* Precompute an incremental checksum adjustment so we can
* edit packets in this stream very quickly. The algorithm is from RFC1624.
*/
u16 dest_ip_hi = cm->match_dest_ip >> 16;
u16 dest_ip_lo = cm->match_dest_ip & 0xffff;
u32 xlate_dest_ip = ~cm->xlate_dest_ip;
u16 xlate_dest_ip_hi = xlate_dest_ip >> 16;
u16 xlate_dest_ip_lo = xlate_dest_ip & 0xffff;
u16 xlate_dest_port = ~cm->xlate_dest_port;
u32 adj;
/*
* When we compute this fold it down to a 16-bit offset
* as that way we can avoid having to do a double
* folding of the twos-complement result because the
* addition of 2 16-bit values cannot cause a double
* wrap-around!
*/
adj = dest_ip_hi + dest_ip_lo + cm->match_dest_port
+ xlate_dest_ip_hi + xlate_dest_ip_lo + xlate_dest_port;
adj = (adj & 0xffff) + (adj >> 16);
adj = (adj & 0xffff) + (adj >> 16);
cm->xlate_dest_csum_adjustment = (u16)adj;
}
if (cm->flags & SFE_IPV4_CONNECTION_MATCH_FLAG_XLATE_SRC) {
u32 adj = ~cm->match_src_ip + cm->xlate_src_ip;
if (adj < cm->xlate_src_ip) {
adj++;
}
adj = (adj & 0xffff) + (adj >> 16);
adj = (adj & 0xffff) + (adj >> 16);
cm->xlate_src_partial_csum_adjustment = (u16)adj;
}
if (cm->flags & SFE_IPV4_CONNECTION_MATCH_FLAG_XLATE_DEST) {
u32 adj = ~cm->match_dest_ip + cm->xlate_dest_ip;
if (adj < cm->xlate_dest_ip) {
adj++;
}
adj = (adj & 0xffff) + (adj >> 16);
adj = (adj & 0xffff) + (adj >> 16);
cm->xlate_dest_partial_csum_adjustment = (u16)adj;
}
}
/*
* sfe_ipv4_update_summary_stats()
* Update the summary stats.
*/
static void sfe_ipv4_update_summary_stats(struct sfe_ipv4 *si, struct sfe_ipv4_stats *stats)
{
int i = 0;
memset(stats, 0, sizeof(*stats));
for_each_possible_cpu(i) {
const struct sfe_ipv4_stats *s = per_cpu_ptr(si->stats_pcpu, i);
stats->connection_create_requests64 += s->connection_create_requests64;
stats->connection_create_collisions64 += s->connection_create_collisions64;
stats->connection_create_failures64 += s->connection_create_failures64;
stats->connection_destroy_requests64 += s->connection_destroy_requests64;
stats->connection_destroy_misses64 += s->connection_destroy_misses64;
stats->connection_match_hash_hits64 += s->connection_match_hash_hits64;
stats->connection_match_hash_reorders64 += s->connection_match_hash_reorders64;
stats->connection_flushes64 += s->connection_flushes64;
stats->packets_dropped64 += s->packets_dropped64;
stats->packets_forwarded64 += s->packets_forwarded64;
stats->packets_fast_xmited64 += s->packets_fast_xmited64;
stats->packets_not_forwarded64 += s->packets_not_forwarded64;
stats->pppoe_encap_packets_forwarded64 += s->pppoe_encap_packets_forwarded64;
stats->pppoe_decap_packets_forwarded64 += s->pppoe_decap_packets_forwarded64;
stats->pppoe_bridge_packets_forwarded64 += s->pppoe_bridge_packets_forwarded64;
}
}
/*
* sfe_ipv4_insert_connection_match()
* Insert a connection match into the hash.
*/
static inline void sfe_ipv4_insert_connection_match(struct sfe_ipv4 *si,
struct sfe_ipv4_connection_match *cm)
{
unsigned int conn_match_idx
= sfe_ipv4_get_connection_match_hash(cm->match_dev, cm->match_protocol,
cm->match_src_ip, cm->match_src_port,
cm->match_dest_ip, cm->match_dest_port);
lockdep_assert_held(&si->lock);
hlist_add_head_rcu(&cm->hnode, &si->hlist_conn_match_hash_head[conn_match_idx]);
#ifdef CONFIG_NF_FLOW_COOKIE
if (!si->flow_cookie_enable)
return;
/*
* Configure hardware to put a flow cookie in packet of this flow,
* then we can accelerate the lookup process when we received this packet.
*/
for (conn_match_idx = 1; conn_match_idx < SFE_FLOW_COOKIE_SIZE; conn_match_idx++) {
struct sfe_flow_cookie_entry *entry = &si->sfe_flow_cookie_table[conn_match_idx];
if ((NULL == entry->match) && time_is_before_jiffies(entry->last_clean_time + HZ)) {
flow_cookie_set_func_t func;
rcu_read_lock();
func = rcu_dereference(si->flow_cookie_set_func);
if (func) {
if (!func(cm->match_protocol, cm->match_src_ip, cm->match_src_port,
cm->match_dest_ip, cm->match_dest_port, conn_match_idx)) {
entry->match = cm;
cm->flow_cookie = conn_match_idx;
}
}
rcu_read_unlock();
break;
}
}
#endif
}
/*
* sfe_ipv4_remove_connection_match()
* Remove a connection match object from the hash.
*/
static inline void sfe_ipv4_remove_connection_match(struct sfe_ipv4 *si, struct sfe_ipv4_connection_match *cm)
{
lockdep_assert_held(&si->lock);
#ifdef CONFIG_NF_FLOW_COOKIE
if (si->flow_cookie_enable) {
/*
* Tell hardware that we no longer need a flow cookie in packet of this flow
*/
unsigned int conn_match_idx;
for (conn_match_idx = 1; conn_match_idx < SFE_FLOW_COOKIE_SIZE; conn_match_idx++) {
struct sfe_flow_cookie_entry *entry = &si->sfe_flow_cookie_table[conn_match_idx];
if (cm == entry->match) {
flow_cookie_set_func_t func;
rcu_read_lock();
func = rcu_dereference(si->flow_cookie_set_func);
if (func) {
func(cm->match_protocol, cm->match_src_ip, cm->match_src_port,
cm->match_dest_ip, cm->match_dest_port, 0);
}
rcu_read_unlock();
cm->flow_cookie = 0;
entry->match = NULL;
entry->last_clean_time = jiffies;
break;
}
}
}
#endif
hlist_del_init_rcu(&cm->hnode);
}
/*
* sfe_ipv4_get_connection_hash()
* Generate the hash used in connection lookups.
*/
static inline unsigned int sfe_ipv4_get_connection_hash(u8 protocol, __be32 src_ip, __be16 src_port,
__be32 dest_ip, __be16 dest_port)
{
u32 hash = ntohl(src_ip ^ dest_ip) ^ protocol ^ ntohs(src_port ^ dest_port);
return ((hash >> SFE_IPV4_CONNECTION_HASH_SHIFT) ^ hash) & SFE_IPV4_CONNECTION_HASH_MASK;
}
/*
* sfe_ipv4_find_connection()
* Get the IPv4 connection info that corresponds to a particular 5-tuple.
*
* On entry we must be holding the lock that protects the hash table.
*/
static inline struct sfe_ipv4_connection *sfe_ipv4_find_connection(struct sfe_ipv4 *si, u32 protocol,
__be32 src_ip, __be16 src_port,
__be32 dest_ip, __be16 dest_port)
{
struct sfe_ipv4_connection *c;
unsigned int conn_idx = sfe_ipv4_get_connection_hash(protocol, src_ip, src_port, dest_ip, dest_port);
lockdep_assert_held(&si->lock);
c = si->conn_hash[conn_idx];
/*
* Will need connection entry for next create/destroy metadata,
* So no need to re-order entry for these requests
*/
while (c) {
if ((c->src_port == src_port)
&& (c->dest_port == dest_port)
&& (c->src_ip == src_ip)
&& (c->dest_ip == dest_ip)
&& (c->protocol == protocol)) {
return c;
}
c = c->next;
}
return NULL;
}
/*
* sfe_ipv4_insert_connection()
* Insert a connection into the hash.
*
* On entry we must be holding the lock that protects the hash table.
*/
static void sfe_ipv4_insert_connection(struct sfe_ipv4 *si, struct sfe_ipv4_connection *c)
{
struct sfe_ipv4_connection **hash_head;
struct sfe_ipv4_connection *prev_head;
unsigned int conn_idx;
lockdep_assert_held(&si->lock);
/*
* Insert entry into the connection hash.
*/
conn_idx = sfe_ipv4_get_connection_hash(c->protocol, c->src_ip, c->src_port,
c->dest_ip, c->dest_port);
hash_head = &si->conn_hash[conn_idx];
prev_head = *hash_head;
c->prev = NULL;
if (prev_head) {
prev_head->prev = c;
}
c->next = prev_head;
*hash_head = c;
/*
* Insert entry into the "all connections" list.
*/
if (si->all_connections_tail) {
c->all_connections_prev = si->all_connections_tail;
si->all_connections_tail->all_connections_next = c;
} else {
c->all_connections_prev = NULL;
si->all_connections_head = c;
}
si->all_connections_tail = c;
c->all_connections_next = NULL;
si->num_connections++;
/*
* Insert the connection match objects too.
*/
sfe_ipv4_insert_connection_match(si, c->original_match);
sfe_ipv4_insert_connection_match(si, c->reply_match);
}
/*
* sfe_ipv4_remove_connection()
* Remove a sfe_ipv4_connection object from the hash.
*/
bool sfe_ipv4_remove_connection(struct sfe_ipv4 *si, struct sfe_ipv4_connection *c)
{
lockdep_assert_held(&si->lock);
if (c->removed) {
DEBUG_ERROR("%px: Connection has been removed already\n", c);
return false;
}
/*
* Remove the connection match objects.
*/
sfe_ipv4_remove_connection_match(si, c->reply_match);
sfe_ipv4_remove_connection_match(si, c->original_match);
/*
* Unlink the connection.
*/
if (c->prev) {
c->prev->next = c->next;
} else {
unsigned int conn_idx = sfe_ipv4_get_connection_hash(c->protocol, c->src_ip, c->src_port,
c->dest_ip, c->dest_port);
si->conn_hash[conn_idx] = c->next;
}
if (c->next) {
c->next->prev = c->prev;
}
/*
* Unlink connection from all_connections list
*/
if (c->all_connections_prev) {
c->all_connections_prev->all_connections_next = c->all_connections_next;
} else {
si->all_connections_head = c->all_connections_next;
}
if (c->all_connections_next) {
c->all_connections_next->all_connections_prev = c->all_connections_prev;
} else {
si->all_connections_tail = c->all_connections_prev;
}
/*
* If I am the next sync connection, move the sync to my next or head.
*/
if (unlikely(si->wc_next == c)) {
si->wc_next = c->all_connections_next;
}
c->removed = true;
si->num_connections--;
return true;
}
/*
* sfe_ipv4_gen_sync_connection()
* Sync a connection.
*
* On entry to this function we expect that the lock for the connection is either
* already held (while called from sfe_ipv4_periodic_sync() or isn't required
* (while called from sfe_ipv4_flush_connection())
*/
static void sfe_ipv4_gen_sync_connection(struct sfe_ipv4 *si, struct sfe_ipv4_connection *c,
struct sfe_connection_sync *sis, sfe_sync_reason_t reason,
u64 now_jiffies)
{
struct sfe_ipv4_connection_match *original_cm;
struct sfe_ipv4_connection_match *reply_cm;
u32 packet_count, byte_count;
/*
* Fill in the update message.
*/
sis->is_v6 = 0;
sis->protocol = c->protocol;
sis->src_ip.ip = c->src_ip;
sis->src_ip_xlate.ip = c->src_ip_xlate;
sis->dest_ip.ip = c->dest_ip;
sis->dest_ip_xlate.ip = c->dest_ip_xlate;
sis->src_port = c->src_port;
sis->src_port_xlate = c->src_port_xlate;
sis->dest_port = c->dest_port;
sis->dest_port_xlate = c->dest_port_xlate;
original_cm = c->original_match;
reply_cm = c->reply_match;
sis->src_td_max_window = original_cm->protocol_state.tcp.max_win;
sis->src_td_end = original_cm->protocol_state.tcp.end;
sis->src_td_max_end = original_cm->protocol_state.tcp.max_end;
sis->dest_td_max_window = reply_cm->protocol_state.tcp.max_win;
sis->dest_td_end = reply_cm->protocol_state.tcp.end;
sis->dest_td_max_end = reply_cm->protocol_state.tcp.max_end;
sfe_ipv4_connection_match_update_summary_stats(original_cm, &packet_count, &byte_count);
sis->src_new_packet_count = packet_count;
sis->src_new_byte_count = byte_count;
sfe_ipv4_connection_match_update_summary_stats(reply_cm, &packet_count, &byte_count);
sis->dest_new_packet_count = packet_count;
sis->dest_new_byte_count = byte_count;
sis->src_dev = original_cm->match_dev;
sis->src_packet_count = original_cm->rx_packet_count64;
sis->src_byte_count = original_cm->rx_byte_count64;
sis->dest_dev = reply_cm->match_dev;
sis->dest_packet_count = reply_cm->rx_packet_count64;
sis->dest_byte_count = reply_cm->rx_byte_count64;
sis->reason = reason;
/*
* Get the time increment since our last sync.
*/
sis->delta_jiffies = now_jiffies - c->last_sync_jiffies;
c->last_sync_jiffies = now_jiffies;
}
/*
* sfe_ipv4_free_connection_rcu()
* Called at RCU qs state to free the connection object.
*/
static void sfe_ipv4_free_connection_rcu(struct rcu_head *head)
{
struct sfe_ipv4_connection *c;
struct udp_sock *up;
struct sock *sk;
/*
* We dont need spin lock as the connection is already removed from link list
*/
c = container_of(head, struct sfe_ipv4_connection, rcu);
BUG_ON(!c->removed);
DEBUG_TRACE("%px: connecton has been deleted\n", c);
/*
* Decrease the refcount taken in function sfe_ipv4_create_rule(),
* during call of __udp4_lib_lookup()
*/
up = c->reply_match->up;
if (up) {
sk = (struct sock *)up;
sock_put(sk);
}
/*
* Release our hold of the source and dest devices and free the memory
* for our connection objects.
*/
dev_put(c->original_dev);
dev_put(c->reply_dev);
kfree(c->original_match);
kfree(c->reply_match);
kfree(c);
}
/*
* sfe_ipv4_sync_status()
* update a connection status to its connection manager.
*
* si: the ipv4 context
* c: which connection to be notified
* reason: what kind of notification: flush, stats or destroy
*/
void sfe_ipv4_sync_status(struct sfe_ipv4 *si,
struct sfe_ipv4_connection *c,
sfe_sync_reason_t reason)
{
struct sfe_connection_sync sis;
u64 now_jiffies;
sfe_sync_rule_callback_t sync_rule_callback;
rcu_read_lock();
sync_rule_callback = rcu_dereference(si->sync_rule_callback);
if (!sync_rule_callback) {
rcu_read_unlock();
return;
}
/*
* Generate a sync message and then sync.
*/
now_jiffies = get_jiffies_64();
sfe_ipv4_gen_sync_connection(si, c, &sis, reason, now_jiffies);
sync_rule_callback(&sis);
rcu_read_unlock();
}
/*
* sfe_ipv4_flush_connection()
* Flush a connection and free all associated resources.
*
* We need to be called with bottom halves disabled locally as we need to acquire
* the connection hash lock and release it again. In general we're actually called
* from within a BH and so we're fine, but we're also called when connections are
* torn down.
*/
void sfe_ipv4_flush_connection(struct sfe_ipv4 *si,
struct sfe_ipv4_connection *c,
sfe_sync_reason_t reason)
{
BUG_ON(!c->removed);
this_cpu_inc(si->stats_pcpu->connection_flushes64);
sfe_ipv4_sync_status(si, c, reason);
/*
* Release our hold of the source and dest devices and free the memory
* for our connection objects.
*/
call_rcu(&c->rcu, sfe_ipv4_free_connection_rcu);
}
/*
* sfe_ipv4_exception_stats_inc()
* Increment exception stats.
*/
void sfe_ipv4_exception_stats_inc(struct sfe_ipv4 *si, enum sfe_ipv4_exception_events reason)
{
struct sfe_ipv4_stats *stats = this_cpu_ptr(si->stats_pcpu);
stats->exception_events64[reason]++;
stats->packets_not_forwarded64++;
}
/*
* sfe_ipv4_is_loal_ip()
* Returns true if IP is local; returns false otherwise.
*/
static bool sfe_ipv4_is_local_ip(struct sfe_ipv4 *si, __be32 ip_addr)
{
struct net_device *dev;
dev = ip_dev_find(&init_net, ip_addr);
if (dev) {
dev_put(dev);
return true;
}
return false;
}
/*
* sfe_ipv4_recv()
* Handle packet receives and forwaring.
*
* Returns 1 if the packet is forwarded or 0 if it isn't.
*/
int sfe_ipv4_recv(struct net_device *dev, struct sk_buff *skb, struct sfe_l2_info *l2_info, bool tun_outer)
{
struct sfe_ipv4 *si = &__si;
unsigned int len;
unsigned int tot_len;
unsigned int frag_off;
unsigned int ihl;
bool sync_on_find;
bool ip_options;
struct iphdr *iph;
u32 protocol;
/*
* Check that we have space for an IP header here.
*/
len = skb->len;
if (unlikely(!pskb_may_pull(skb, sizeof(struct iphdr)))) {
sfe_ipv4_exception_stats_inc(si, SFE_IPV4_EXCEPTION_EVENT_HEADER_INCOMPLETE);
DEBUG_TRACE("len: %u is too short\n", len);
return 0;
}
/*
* Validate ip csum if necessary. If ip_summed is set to CHECKSUM_UNNECESSARY, it is assumed
* that the L3 checksum is validated by the Rx interface or the tunnel interface that has
* generated the packet.
*/
iph = (struct iphdr *)skb->data;
if (unlikely(skb->ip_summed != CHECKSUM_UNNECESSARY) && (ip_fast_csum((u8 *)iph, iph->ihl))) {
sfe_ipv4_exception_stats_inc(si, SFE_IPV4_EXCEPTION_EVENT_HEADER_CSUM_BAD);
DEBUG_TRACE("Bad IPv4 header csum: 0x%x\n", iph->check);
return 0;
}
/*
* Check that our "total length" is large enough for an IP header.
*/
tot_len = ntohs(iph->tot_len);
if (unlikely(tot_len < sizeof(struct iphdr))) {
sfe_ipv4_exception_stats_inc(si, SFE_IPV4_EXCEPTION_EVENT_BAD_TOTAL_LENGTH);
DEBUG_TRACE("tot_len: %u is too short\n", tot_len);
return 0;
}
/*
* Is our IP version wrong?
*/
if (unlikely(iph->version != 4)) {
sfe_ipv4_exception_stats_inc(si, SFE_IPV4_EXCEPTION_EVENT_NON_V4);
DEBUG_TRACE("IP version: %u\n", iph->version);
return 0;
}
/*
* Does our datagram fit inside the skb?
*/
if (unlikely(tot_len > len)) {
DEBUG_TRACE("tot_len: %u, exceeds len: %u\n", tot_len, len);
sfe_ipv4_exception_stats_inc(si, SFE_IPV4_EXCEPTION_EVENT_DATAGRAM_INCOMPLETE);
return 0;
}
/*
* Do we have a non-initial fragment?
*/
frag_off = ntohs(iph->frag_off);
if (unlikely(frag_off & IP_OFFSET)) {
sfe_ipv4_exception_stats_inc(si, SFE_IPV4_EXCEPTION_EVENT_NON_INITIAL_FRAGMENT);
DEBUG_TRACE("non-initial fragment\n");
return 0;
}
/*
* If we have a (first) fragment then mark it to cause any connection to flush.
*/
sync_on_find = unlikely(frag_off & IP_MF) ? true : false;
/*
* Do we have any IP options? That's definite a slow path! If we do have IP
* options we need to recheck our header size.
*/
ihl = iph->ihl << 2;
ip_options = unlikely(ihl != sizeof(struct iphdr)) ? true : false;
if (unlikely(ip_options)) {
if (unlikely(len < ihl)) {
DEBUG_TRACE("len: %u is too short for header of size: %u\n", len, ihl);
sfe_ipv4_exception_stats_inc(si, SFE_IPV4_EXCEPTION_EVENT_IP_OPTIONS_INCOMPLETE);
return 0;
}
sync_on_find = true;
}
protocol = iph->protocol;
if (IPPROTO_UDP == protocol) {
return sfe_ipv4_recv_udp(si, skb, dev, len, iph, ihl, sync_on_find, l2_info, tun_outer);
}
if (IPPROTO_TCP == protocol) {
return sfe_ipv4_recv_tcp(si, skb, dev, len, iph, ihl, sync_on_find, l2_info);
}
if (IPPROTO_ICMP == protocol) {
return sfe_ipv4_recv_icmp(si, skb, dev, len, iph, ihl);
}
#ifdef SFE_GRE_TUN_ENABLE
if (IPPROTO_GRE == protocol) {
return sfe_ipv4_recv_gre(si, skb, dev, len, iph, ihl, sync_on_find, l2_info, tun_outer);
}
#endif
sfe_ipv4_exception_stats_inc(si, SFE_IPV4_EXCEPTION_EVENT_UNHANDLED_PROTOCOL);
DEBUG_TRACE("not UDP, TCP or ICMP: %u\n", protocol);
return 0;
}
static void
sfe_ipv4_update_tcp_state(struct sfe_ipv4_connection *c,
struct sfe_ipv4_rule_create_msg *msg)
{
struct sfe_ipv4_connection_match *orig_cm;
struct sfe_ipv4_connection_match *repl_cm;
struct sfe_ipv4_tcp_connection_match *orig_tcp;
struct sfe_ipv4_tcp_connection_match *repl_tcp;
orig_cm = c->original_match;
repl_cm = c->reply_match;
orig_tcp = &orig_cm->protocol_state.tcp;
repl_tcp = &repl_cm->protocol_state.tcp;
/* update orig */
if (orig_tcp->max_win < msg->tcp_rule.flow_max_window) {
orig_tcp->max_win = msg->tcp_rule.flow_max_window;
}
if ((s32)(orig_tcp->end - msg->tcp_rule.flow_end) < 0) {
orig_tcp->end = msg->tcp_rule.flow_end;
}
if ((s32)(orig_tcp->max_end - msg->tcp_rule.flow_max_end) < 0) {
orig_tcp->max_end = msg->tcp_rule.flow_max_end;
}
/* update reply */
if (repl_tcp->max_win < msg->tcp_rule.return_max_window) {
repl_tcp->max_win = msg->tcp_rule.return_max_window;
}
if ((s32)(repl_tcp->end - msg->tcp_rule.return_end) < 0) {
repl_tcp->end = msg->tcp_rule.return_end;
}
if ((s32)(repl_tcp->max_end - msg->tcp_rule.return_max_end) < 0) {
repl_tcp->max_end = msg->tcp_rule.return_max_end;
}
/* update match flags */
orig_cm->flags &= ~SFE_IPV4_CONNECTION_MATCH_FLAG_NO_SEQ_CHECK;
repl_cm->flags &= ~SFE_IPV4_CONNECTION_MATCH_FLAG_NO_SEQ_CHECK;
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_NO_SEQ_CHECK) {
orig_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_NO_SEQ_CHECK;
repl_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_NO_SEQ_CHECK;
}
}
static void
sfe_ipv4_update_protocol_state(struct sfe_ipv4_connection *c,
struct sfe_ipv4_rule_create_msg *msg)
{
switch (msg->tuple.protocol) {
case IPPROTO_TCP:
sfe_ipv4_update_tcp_state(c, msg);
break;
}
}
/*
* sfe_ipv4_match_entry_set_vlan()
*/
static void sfe_ipv4_match_entry_set_vlan(
struct sfe_ipv4_connection_match *cm,
u32 primary_ingress_vlan_tag,
u32 primary_egress_vlan_tag,
u32 secondary_ingress_vlan_tag,
u32 secondary_egress_vlan_tag)
{
u16 tpid;
/*
* Prevent stacking header counts when updating.
*/
cm->ingress_vlan_hdr_cnt = 0;
cm->egress_vlan_hdr_cnt = 0;
memset(cm->ingress_vlan_hdr, 0, sizeof(cm->ingress_vlan_hdr));
memset(cm->egress_vlan_hdr, 0, sizeof(cm->egress_vlan_hdr));
/*
* vlan_hdr[0] corresponds to outer tag
* vlan_hdr[1] corresponds to inner tag
* Extract the vlan information (tpid and tci) from rule message
*/
if ((primary_ingress_vlan_tag & VLAN_VID_MASK) != SFE_VLAN_ID_NOT_CONFIGURED) {
tpid = (u16)(primary_ingress_vlan_tag >> 16);
cm->ingress_vlan_hdr[0].tpid = ntohs(tpid);
cm->ingress_vlan_hdr[0].tci = (u16)primary_ingress_vlan_tag;
cm->ingress_vlan_hdr_cnt++;
}
if ((secondary_ingress_vlan_tag & VLAN_VID_MASK) != SFE_VLAN_ID_NOT_CONFIGURED) {
tpid = (u16)(secondary_ingress_vlan_tag >> 16);
cm->ingress_vlan_hdr[1].tpid = ntohs(tpid);
cm->ingress_vlan_hdr[1].tci = (u16)secondary_ingress_vlan_tag;
cm->ingress_vlan_hdr_cnt++;
}
if ((primary_egress_vlan_tag & VLAN_VID_MASK) != SFE_VLAN_ID_NOT_CONFIGURED) {
tpid = (u16)(primary_egress_vlan_tag >> 16);
cm->egress_vlan_hdr[0].tpid = ntohs(tpid);
cm->egress_vlan_hdr[0].tci = (u16)primary_egress_vlan_tag;
cm->egress_vlan_hdr_cnt++;
}
if ((secondary_egress_vlan_tag & VLAN_VID_MASK) != SFE_VLAN_ID_NOT_CONFIGURED) {
tpid = (u16)(secondary_egress_vlan_tag >> 16);
cm->egress_vlan_hdr[1].tpid = ntohs(tpid);
cm->egress_vlan_hdr[1].tci = (u16)secondary_egress_vlan_tag;
cm->egress_vlan_hdr_cnt++;
}
}
void sfe_ipv4_update_rule(struct sfe_ipv4_rule_create_msg *msg)
{
struct sfe_ipv4_connection *c;
struct sfe_ipv4 *si = &__si;
spin_lock_bh(&si->lock);
c = sfe_ipv4_find_connection(si,
msg->tuple.protocol,
msg->tuple.flow_ip,
msg->tuple.flow_ident,
msg->tuple.return_ip,
msg->tuple.return_ident);
if (c != NULL) {
sfe_ipv4_update_protocol_state(c, msg);
}
spin_unlock_bh(&si->lock);
}
/*
* sfe_ipv4_mark_rule_update()
* Updates the mark values of match entries.
*/
void sfe_ipv4_mark_rule_update(struct sfe_connection_mark *mark)
{
struct sfe_ipv4_connection *c;
struct sfe_ipv4 *si = &__si;
spin_lock_bh(&si->lock);
c = sfe_ipv4_find_connection(si, mark->protocol,
mark->src_ip[0],
mark->src_port,
mark->dest_ip[0],
mark->dest_port);
if (!c) {
spin_unlock_bh(&si->lock);
DEBUG_WARN("%px: connection not found for mark update\n", mark);
return;
}
c->original_match->mark = mark->mark;
c->reply_match->mark = mark->mark;
spin_unlock_bh(&si->lock);
DEBUG_TRACE("%px: connection mark updated with %d\n", mark, mark->mark);
}
EXPORT_SYMBOL(sfe_ipv4_mark_rule_update);
/*
* sfe_ipv4_xmit_eth_type_check()
* Checking if MAC header has to be written.
*/
static inline bool sfe_ipv4_xmit_eth_type_check(struct net_device *dev, u32 cm_flags)
{
if (!(dev->flags & IFF_NOARP)) {
return true;
}
/*
* For PPPoE, since we are now supporting PPPoE encapsulation, we are writing L2 header.
*/
if (unlikely(cm_flags & SFE_IPV4_CONNECTION_MATCH_FLAG_PPPOE_ENCAP)) {
return true;
}
return false;
}
/*
* sfe_ipv4_create_rule()
* Create a forwarding rule.
*/
int sfe_ipv4_create_rule(struct sfe_ipv4_rule_create_msg *msg)
{
struct sfe_ipv4 *si = &__si;
struct sfe_ipv4_connection *c, *c_old;
struct sfe_ipv4_connection_match *original_cm;
struct sfe_ipv4_connection_match *reply_cm;
struct net_device *dest_dev;
struct net_device *src_dev;
struct sfe_ipv4_5tuple *tuple = &msg->tuple;
s32 flow_interface_num = msg->conn_rule.flow_top_interface_num;
s32 return_interface_num = msg->conn_rule.return_top_interface_num;
struct net *net;
struct sock *sk;
unsigned int src_if_idx;
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_USE_FLOW_BOTTOM_INTERFACE) {
flow_interface_num = msg->conn_rule.flow_interface_num;
}
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_USE_RETURN_BOTTOM_INTERFACE) {
return_interface_num = msg->conn_rule.return_interface_num;
}
src_dev = dev_get_by_index(&init_net, flow_interface_num);
if (!src_dev) {
DEBUG_WARN("%px: Unable to find src_dev corresponding to %d\n", msg,
flow_interface_num);
this_cpu_inc(si->stats_pcpu->connection_create_failures64);
return -EINVAL;
}
dest_dev = dev_get_by_index(&init_net, return_interface_num);
if (!dest_dev) {
DEBUG_WARN("%px: Unable to find dest_dev corresponding to %d\n", msg,
return_interface_num);
this_cpu_inc(si->stats_pcpu->connection_create_failures64);
dev_put(src_dev);
return -EINVAL;
}
if (unlikely((dest_dev->reg_state != NETREG_REGISTERED) ||
(src_dev->reg_state != NETREG_REGISTERED))) {
dev_put(src_dev);
dev_put(dest_dev);
DEBUG_WARN("%px: src_dev=%s and dest_dev=%s are unregistered\n", msg,
src_dev->name, dest_dev->name);
this_cpu_inc(si->stats_pcpu->connection_create_failures64);
return -EINVAL;
}
/*
* Allocate the various connection tracking objects.
*/
c = (struct sfe_ipv4_connection *)kzalloc(sizeof(struct sfe_ipv4_connection), GFP_ATOMIC);
if (unlikely(!c)) {
DEBUG_WARN("%px: memory allocation of connection entry failed\n", msg);
this_cpu_inc(si->stats_pcpu->connection_create_failures64);
dev_put(src_dev);
dev_put(dest_dev);
return -ENOMEM;
}
original_cm = (struct sfe_ipv4_connection_match *)kzalloc(sizeof(struct sfe_ipv4_connection_match), GFP_ATOMIC);
if (unlikely(!original_cm)) {
DEBUG_WARN("%px: memory allocation of connection match entry failed\n", msg);
this_cpu_inc(si->stats_pcpu->connection_create_failures64);
kfree(c);
dev_put(src_dev);
dev_put(dest_dev);
return -ENOMEM;
}
reply_cm = (struct sfe_ipv4_connection_match *)kzalloc(sizeof(struct sfe_ipv4_connection_match), GFP_ATOMIC);
if (unlikely(!reply_cm)) {
DEBUG_WARN("%px: memory allocation of connection match entry failed\n", msg);
this_cpu_inc(si->stats_pcpu->connection_create_failures64);
kfree(original_cm);
kfree(c);
dev_put(src_dev);
dev_put(dest_dev);
return -ENOMEM;
}
this_cpu_inc(si->stats_pcpu->connection_create_requests64);
spin_lock_bh(&si->lock);
/*
* Check to see if there is already a flow that matches the rule we're
* trying to create. If there is then we can't create a new one.
*/
c_old = sfe_ipv4_find_connection(si,
msg->tuple.protocol,
msg->tuple.flow_ip,
msg->tuple.flow_ident,
msg->tuple.return_ip,
msg->tuple.return_ident);
if (c_old != NULL) {
this_cpu_inc(si->stats_pcpu->connection_create_collisions64);
/*
* If we already have the flow then it's likely that this
* request to create the connection rule contains more
* up-to-date information. Check and update accordingly.
*/
sfe_ipv4_update_protocol_state(c, msg);
spin_unlock_bh(&si->lock);
kfree(reply_cm);
kfree(original_cm);
kfree(c);
dev_put(src_dev);
dev_put(dest_dev);
DEBUG_TRACE("%px: connection already exists - p:%d\n"
" s: %s:%pM:%pI4:%u, d: %s:%pM:%pI4:%u\n",
msg, tuple->protocol,
src_dev->name, msg->conn_rule.flow_mac, &tuple->flow_ip, ntohs(tuple->flow_ident),
dest_dev->name, msg->conn_rule.return_mac, &tuple->return_ip, ntohs(tuple->return_ident));
return -EADDRINUSE;
}
/*
* Fill in the "original" direction connection matching object.
* Note that the transmit MAC address is "dest_mac_xlate" because
* we always know both ends of a connection by their translated
* addresses and not their public addresses.
*/
original_cm->match_dev = src_dev;
original_cm->match_protocol = tuple->protocol;
original_cm->match_src_ip = tuple->flow_ip;
original_cm->match_src_port = netif_is_vxlan(src_dev) ? 0 : tuple->flow_ident;
original_cm->match_dest_ip = tuple->return_ip;
original_cm->match_dest_port = tuple->return_ident;
original_cm->xlate_src_ip = msg->conn_rule.flow_ip_xlate;
original_cm->xlate_src_port = msg->conn_rule.flow_ident_xlate;
original_cm->xlate_dest_ip = msg->conn_rule.return_ip_xlate;
original_cm->xlate_dest_port = msg->conn_rule.return_ident_xlate;
if (tuple->protocol == IPPROTO_GRE) {
/*
* the PPTP is 4 tuple lookup.
* During th rule lookup destination call id from packet
* is matched against destination port in cm.
*/
original_cm->match_src_port = 0;
original_cm->xlate_src_port = 0;
}
original_cm->xmit_dev = dest_dev;
original_cm->xmit_dev_mtu = msg->conn_rule.return_mtu;
original_cm->connection = c;
original_cm->counter_match = reply_cm;
/*
* UDP Socket is valid only in decap direction.
*/
RCU_INIT_POINTER(original_cm->up, NULL);
if (msg->valid_flags & SFE_RULE_CREATE_MARK_VALID) {
original_cm->mark = msg->mark_rule.flow_mark;
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_MARK;
}
if (msg->valid_flags & SFE_RULE_CREATE_QOS_VALID) {
original_cm->priority = msg->qos_rule.flow_qos_tag;
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_PRIORITY_REMARK;
}
if (msg->valid_flags & SFE_RULE_CREATE_DSCP_MARKING_VALID) {
original_cm->dscp = msg->dscp_rule.flow_dscp << SFE_IPV4_DSCP_SHIFT;
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_DSCP_REMARK;
}
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_BRIDGE_FLOW) {
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_BRIDGE_FLOW;
}
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_FLOW_TRANSMIT_FAST) {
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_FAST_XMIT_DEV_ADMISSION;
}
/*
* Add VLAN rule to original_cm
*/
if (msg->valid_flags & SFE_RULE_CREATE_VLAN_VALID) {
struct sfe_vlan_rule *vlan_primary_rule = &msg->vlan_primary_rule;
struct sfe_vlan_rule *vlan_secondary_rule = &msg->vlan_secondary_rule;
sfe_ipv4_match_entry_set_vlan(original_cm,
vlan_primary_rule->ingress_vlan_tag,
vlan_primary_rule->egress_vlan_tag,
vlan_secondary_rule->ingress_vlan_tag,
vlan_secondary_rule->egress_vlan_tag);
if ((msg->rule_flags & SFE_RULE_CREATE_FLAG_USE_RETURN_BOTTOM_INTERFACE) &&
original_cm->egress_vlan_hdr_cnt > 0) {
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_INSERT_EGRESS_VLAN_TAG;
original_cm->l2_hdr_size += original_cm->egress_vlan_hdr_cnt * VLAN_HLEN;
}
}
if ((IPPROTO_GRE == tuple->protocol) && !sfe_ipv4_is_local_ip(si, original_cm->match_dest_ip)) {
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_PASSTHROUGH;
}
#ifdef CONFIG_NF_FLOW_COOKIE
original_cm->flow_cookie = 0;
#endif
#ifdef CONFIG_XFRM
if (msg->valid_flags & SFE_RULE_CREATE_DIRECTION_VALID) {
original_cm->flow_accel = msg->direction_rule.flow_accel;
} else {
original_cm->flow_accel = 1;
}
#endif
/*
* If l2_features are disabled and flow uses l2 features such as macvlan/bridge/pppoe/vlan,
* bottom interfaces are expected to be disabled in the flow rule and always top interfaces
* are used. In such cases, do not use HW csum offload. csum offload is used only when we
* are sending directly to the destination interface that supports it.
*/
if (likely(dest_dev->features & NETIF_F_HW_CSUM) && sfe_dev_has_hw_csum(dest_dev)) {
if ((msg->conn_rule.return_top_interface_num == msg->conn_rule.return_interface_num) ||
(msg->rule_flags & SFE_RULE_CREATE_FLAG_USE_RETURN_BOTTOM_INTERFACE)) {
/*
* Dont enable CSUM offload
*/
#if 0
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_CSUM_OFFLOAD;
#endif
}
}
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_FLOW_SRC_INTERFACE_CHECK) {
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_SRC_INTERFACE_CHECK;
}
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_FLOW_SRC_INTERFACE_CHECK_NO_FLUSH) {
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_SRC_INTERFACE_CHECK_NO_FLUSH;
}
/*
* Adding PPPoE parameters to original and reply entries based on the direction where
* PPPoE header is valid in ECM rule.
*
* If PPPoE is valid in flow direction (from interface is PPPoE), then
* original cm will have PPPoE at ingress (strip PPPoE header)
* reply cm will have PPPoE at egress (add PPPoE header)
*
* If PPPoE is valid in return direction (to interface is PPPoE), then
* original cm will have PPPoE at egress (add PPPoE header)
* reply cm will have PPPoE at ingress (strip PPPoE header)
*/
if (msg->valid_flags & SFE_RULE_CREATE_PPPOE_DECAP_VALID) {
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_PPPOE_DECAP;
original_cm->pppoe_session_id = msg->pppoe_rule.flow_pppoe_session_id;
ether_addr_copy(original_cm->pppoe_remote_mac, msg->pppoe_rule.flow_pppoe_remote_mac);
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_PPPOE_ENCAP;
reply_cm->l2_hdr_size += SFE_PPPOE_SESSION_HEADER_SIZE;
reply_cm->pppoe_session_id = msg->pppoe_rule.flow_pppoe_session_id;
ether_addr_copy(reply_cm->pppoe_remote_mac, msg->pppoe_rule.flow_pppoe_remote_mac);
}
if (msg->valid_flags & SFE_RULE_CREATE_PPPOE_ENCAP_VALID) {
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_PPPOE_ENCAP;
original_cm->l2_hdr_size += SFE_PPPOE_SESSION_HEADER_SIZE;
original_cm->pppoe_session_id = msg->pppoe_rule.return_pppoe_session_id;
ether_addr_copy(original_cm->pppoe_remote_mac, msg->pppoe_rule.return_pppoe_remote_mac);
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_PPPOE_DECAP;
reply_cm->pppoe_session_id = msg->pppoe_rule.return_pppoe_session_id;
ether_addr_copy(reply_cm->pppoe_remote_mac, msg->pppoe_rule.return_pppoe_remote_mac);
}
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_RETURN_SRC_INTERFACE_CHECK) {
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_SRC_INTERFACE_CHECK;
}
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_RETURN_SRC_INTERFACE_CHECK_NO_FLUSH) {
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_SRC_INTERFACE_CHECK_NO_FLUSH;
}
/*
* For the non-arp interface, we don't write L2 HDR.
*/
if (sfe_ipv4_xmit_eth_type_check(dest_dev, original_cm->flags)) {
/*
* Check whether the rule has configured a specific source MAC address to use.
* This is needed when virtual L3 interfaces such as br-lan, macvlan, vlan are used during egress
*/
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_BRIDGE_FLOW) {
ether_addr_copy((u8 *)original_cm->xmit_src_mac, (u8 *)msg->conn_rule.flow_mac);
} else {
if ((msg->valid_flags & SFE_RULE_CREATE_SRC_MAC_VALID) &&
(msg->src_mac_rule.mac_valid_flags & SFE_SRC_MAC_RETURN_VALID)) {
ether_addr_copy((u8 *)original_cm->xmit_src_mac, (u8 *)msg->src_mac_rule.return_src_mac);
} else {
ether_addr_copy((u8 *)original_cm->xmit_src_mac, (u8 *)dest_dev->dev_addr);
}
}
ether_addr_copy((u8 *)original_cm->xmit_dest_mac, (u8 *)msg->conn_rule.return_mac);
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_WRITE_L2_HDR;
original_cm->l2_hdr_size += ETH_HLEN;
/*
* If our dev writes Ethernet headers then we can write a really fast
* version.
*/
if (dest_dev->header_ops) {
if (dest_dev->header_ops->create == eth_header) {
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_WRITE_FAST_ETH_HDR;
}
}
}
/*
* Fill in the "reply" direction connection matching object.
*/
reply_cm->match_dev = dest_dev;
reply_cm->match_protocol = tuple->protocol;
reply_cm->match_src_ip = msg->conn_rule.return_ip_xlate;
/*
* Keep source port as 0 for VxLAN tunnels.
*/
if (netif_is_vxlan(src_dev) || netif_is_vxlan(dest_dev)) {
reply_cm->match_src_port = 0;
} else {
reply_cm->match_src_port = msg->conn_rule.return_ident_xlate;
}
reply_cm->match_dest_ip = msg->conn_rule.flow_ip_xlate;
reply_cm->match_dest_port = msg->conn_rule.flow_ident_xlate;
reply_cm->xlate_src_ip = tuple->return_ip;
reply_cm->xlate_src_port = tuple->return_ident;
reply_cm->xlate_dest_ip = tuple->flow_ip;
reply_cm->xlate_dest_port = tuple->flow_ident;
if (tuple->protocol == IPPROTO_GRE) {
/*
* the PPTP is 4 tuple lookup.
* During th rule lookup destination call id from packet
* is matched against destination port in cm.
*/
reply_cm->match_src_port = 0;
reply_cm->xlate_src_port = 0;
}
reply_cm->xmit_dev = src_dev;
reply_cm->xmit_dev_mtu = msg->conn_rule.flow_mtu;
reply_cm->connection = c;
reply_cm->counter_match = original_cm;
if (msg->valid_flags & SFE_RULE_CREATE_MARK_VALID) {
reply_cm->mark = msg->mark_rule.return_mark;
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_MARK;
}
if (msg->valid_flags & SFE_RULE_CREATE_QOS_VALID) {
reply_cm->priority = msg->qos_rule.return_qos_tag;
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_PRIORITY_REMARK;
}
if (msg->valid_flags & SFE_RULE_CREATE_DSCP_MARKING_VALID) {
reply_cm->dscp = msg->dscp_rule.return_dscp << SFE_IPV4_DSCP_SHIFT;
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_DSCP_REMARK;
}
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_BRIDGE_FLOW) {
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_BRIDGE_FLOW;
}
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_RETURN_TRANSMIT_FAST) {
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_FAST_XMIT_DEV_ADMISSION;
}
if ((IPPROTO_GRE == tuple->protocol) && !sfe_ipv4_is_local_ip(si, reply_cm->match_dest_ip)) {
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_PASSTHROUGH;
}
/*
* Setup UDP Socket if found to be valid for decap.
*/
RCU_INIT_POINTER(reply_cm->up, NULL);
net = dev_net(reply_cm->match_dev);
src_if_idx = src_dev->ifindex;
rcu_read_lock();
/*
* Look for the associated sock object.
* __udp4_lib_lookup() holds a reference for this sock object,
* which will be released in sfe_ipv4_free_connection_rcu()
*/
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0))
sk = __udp4_lib_lookup(net, reply_cm->match_dest_ip, reply_cm->match_dest_port,
reply_cm->xlate_src_ip, reply_cm->xlate_src_port, src_if_idx, &udp_table);
#else
sk = __udp4_lib_lookup(net, reply_cm->match_dest_ip, reply_cm->match_dest_port,
reply_cm->xlate_src_ip, reply_cm->xlate_src_port, src_if_idx, 0, &udp_table, NULL);
#endif
rcu_read_unlock();
/*
* We set the UDP sock pointer as valid only for decap direction.
*/
if (sk && udp_sk(sk)->encap_type) {
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0))
if (!atomic_add_unless(&sk->sk_refcnt, 1, 0)) {
#else
if (!refcount_inc_not_zero(&sk->sk_refcnt)) {
#endif
spin_unlock_bh(&si->lock);
kfree(reply_cm);
kfree(original_cm);
kfree(c);
DEBUG_TRACE("%px: sfe: unable to take reference for socket(%px) p:%d\n"
" s: %s:%pM:%pI4:%u, d: %s:%pM:%pI4:%u\n",
msg, sk, tuple->protocol,
src_dev->name, msg->conn_rule.flow_mac, &tuple->flow_ip, ntohs(tuple->flow_ident),
dest_dev->name, msg->conn_rule.return_mac, &tuple->return_ip, ntohs(tuple->return_ident));
dev_put(src_dev);
dev_put(dest_dev);
return -ESHUTDOWN;
}
rcu_assign_pointer(reply_cm->up, udp_sk(sk));
DEBUG_INFO("%px: Sock(%px) lookup success with reply_cm direction\n", msg, sk);
DEBUG_INFO("%px: SFE connection -\n"
" s: %s:%pI4(%pI4):%u(%u)\n"
" d: %s:%pI4(%pI4):%u(%u)\n",
msg, reply_cm->match_dev->name, &reply_cm->match_src_ip, &reply_cm->xlate_src_ip,
ntohs(reply_cm->match_src_port), ntohs(reply_cm->xlate_src_port),
reply_cm->xmit_dev->name, &reply_cm->match_dest_ip, &reply_cm->xlate_dest_ip,
ntohs(reply_cm->match_dest_port), ntohs(reply_cm->xlate_dest_port));
}
/*
* Add VLAN rule to reply_cm
*/
if (msg->valid_flags & SFE_RULE_CREATE_VLAN_VALID) {
struct sfe_vlan_rule *vlan_primary_rule = &msg->vlan_primary_rule;
struct sfe_vlan_rule *vlan_secondary_rule = &msg->vlan_secondary_rule;
sfe_ipv4_match_entry_set_vlan(reply_cm,
vlan_primary_rule->egress_vlan_tag,
vlan_primary_rule->ingress_vlan_tag,
vlan_secondary_rule->egress_vlan_tag,
vlan_secondary_rule->ingress_vlan_tag);
if ((msg->rule_flags & SFE_RULE_CREATE_FLAG_USE_FLOW_BOTTOM_INTERFACE) &&
reply_cm->egress_vlan_hdr_cnt > 0) {
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_INSERT_EGRESS_VLAN_TAG;
reply_cm->l2_hdr_size += reply_cm->egress_vlan_hdr_cnt * VLAN_HLEN;
}
}
/*
* the net_protocol handler will be used only in decap path
* for non passthrough case.
*/
original_cm->proto = NULL;
reply_cm->proto = NULL;
#ifdef SFE_GRE_TUN_ENABLE
if ((IPPROTO_GRE == tuple->protocol) && !(reply_cm->flags & SFE_IPV4_CONNECTION_MATCH_FLAG_PASSTHROUGH)) {
rcu_read_lock();
reply_cm->proto = rcu_dereference(inet_protos[IPPROTO_GRE]);
rcu_read_unlock();
if (unlikely(!reply_cm->proto)) {
kfree(reply_cm);
kfree(original_cm);
kfree(c);
dev_put(src_dev);
dev_put(dest_dev);
DEBUG_WARN("sfe: GRE proto handler is not registered\n");
return -EPERM;
}
}
#endif
#ifdef CONFIG_NF_FLOW_COOKIE
reply_cm->flow_cookie = 0;
#endif
#ifdef CONFIG_XFRM
if (msg->valid_flags & SFE_RULE_CREATE_DIRECTION_VALID) {
reply_cm->flow_accel = msg->direction_rule.return_accel;
} else {
reply_cm->flow_accel = 1;
}
#endif
/*
* If l2_features are disabled and flow uses l2 features such as macvlan/bridge/pppoe/vlan,
* bottom interfaces are expected to be disabled in the flow rule and always top interfaces
* are used. In such cases, do not use HW csum offload. csum offload is used only when we
* are sending directly to the destination interface that supports it.
*/
if (likely(src_dev->features & NETIF_F_HW_CSUM) && sfe_dev_has_hw_csum(src_dev)) {
if ((msg->conn_rule.flow_top_interface_num == msg->conn_rule.flow_interface_num) ||
(msg->rule_flags & SFE_RULE_CREATE_FLAG_USE_FLOW_BOTTOM_INTERFACE)) {
/*
* Dont enable CSUM offload
*/
#if 0
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_CSUM_OFFLOAD;
#endif
}
}
/*
* For the non-arp interface, we don't write L2 HDR.
*/
if (sfe_ipv4_xmit_eth_type_check(src_dev, reply_cm->flags)) {
/*
* Check whether the rule has configured a specific source MAC address to use.
* This is needed when virtual L3 interfaces such as br-lan, macvlan, vlan are used during egress
*/
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_BRIDGE_FLOW) {
ether_addr_copy((u8 *)reply_cm->xmit_src_mac, (u8 *)msg->conn_rule.return_mac);
} else {
if ((msg->valid_flags & SFE_RULE_CREATE_SRC_MAC_VALID) &&
(msg->src_mac_rule.mac_valid_flags & SFE_SRC_MAC_FLOW_VALID)) {
ether_addr_copy((u8 *)reply_cm->xmit_src_mac, (u8 *)msg->src_mac_rule.flow_src_mac);
} else {
ether_addr_copy((u8 *)reply_cm->xmit_src_mac, (u8 *)src_dev->dev_addr);
}
}
ether_addr_copy((u8 *)reply_cm->xmit_dest_mac, (u8 *)msg->conn_rule.flow_mac);
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_WRITE_L2_HDR;
reply_cm->l2_hdr_size += ETH_HLEN;
/*
* If our dev writes Ethernet headers then we can write a really fast
* version.
*/
if (src_dev->header_ops) {
if (src_dev->header_ops->create == eth_header) {
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_WRITE_FAST_ETH_HDR;
}
}
}
if ((tuple->return_ip != msg->conn_rule.return_ip_xlate) ||
(tuple->return_ident != msg->conn_rule.return_ident_xlate)) {
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_XLATE_DEST;
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_XLATE_SRC;
}
if ((tuple->flow_ip != msg->conn_rule.flow_ip_xlate) ||
(tuple->flow_ident != msg->conn_rule.flow_ident_xlate)) {
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_XLATE_SRC;
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_XLATE_DEST;
}
/*
* Initialize the protocol-specific information that we track.
*/
switch (tuple->protocol) {
case IPPROTO_TCP:
original_cm->protocol_state.tcp.win_scale = msg->tcp_rule.flow_window_scale;
original_cm->protocol_state.tcp.max_win = msg->tcp_rule.flow_max_window ? msg->tcp_rule.flow_max_window : 1;
original_cm->protocol_state.tcp.end = msg->tcp_rule.flow_end;
original_cm->protocol_state.tcp.max_end = msg->tcp_rule.flow_max_end;
reply_cm->protocol_state.tcp.win_scale = msg->tcp_rule.return_window_scale;
reply_cm->protocol_state.tcp.max_win = msg->tcp_rule.return_max_window ? msg->tcp_rule.return_max_window : 1;
reply_cm->protocol_state.tcp.end = msg->tcp_rule.return_end;
reply_cm->protocol_state.tcp.max_end = msg->tcp_rule.return_max_end;
if (msg->rule_flags & SFE_RULE_CREATE_FLAG_NO_SEQ_CHECK) {
original_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_NO_SEQ_CHECK;
reply_cm->flags |= SFE_IPV4_CONNECTION_MATCH_FLAG_NO_SEQ_CHECK;
}
break;
}
/*
* Fill in the ipv4_connection object.
*/
c->protocol = tuple->protocol;
c->src_ip = tuple->flow_ip;
c->src_ip_xlate = msg->conn_rule.flow_ip_xlate;
c->src_port = tuple->flow_ident;
c->src_port_xlate = msg->conn_rule.flow_ident_xlate;
c->original_dev = src_dev;
c->original_match = original_cm;
c->dest_ip = tuple->return_ip;
c->dest_ip_xlate = msg->conn_rule.return_ip_xlate;
c->dest_port = tuple->return_ident;
c->dest_port_xlate = msg->conn_rule.return_ident_xlate;
c->reply_dev = dest_dev;
c->reply_match = reply_cm;
c->debug_read_seq = 0;
c->last_sync_jiffies = get_jiffies_64();
c->removed = false;
sfe_ipv4_connection_match_compute_translations(original_cm);
sfe_ipv4_connection_match_compute_translations(reply_cm);
sfe_ipv4_insert_connection(si, c);
spin_unlock_bh(&si->lock);
/*
* We have everything we need!
*/
DEBUG_INFO("NEW connection - p: %d\n"
"original_cm: match_dev=src_dev: %s %d %pM\n"
" xmit_dev=dest_dev: %s %d %pM\n"
" xmit_src_mac: %pM\n"
" xmit_dest_mac: %pM\n"
" flags: %x l2_hdr: %u\n"
"flow_ip: %pI4:%u\n"
"flow_ip_xlate: %pI4:%u\n"
"flow_mac: %pM\n"
"reply_cm: match_dev=dest_dev: %s %d %pM\n"
" xmit_dev=src_dev: %s %d %pM\n"
" xmit_src_mac: %pM\n"
" xmit_dest_mac: %pM\n"
" flags: %x l2_hdr: %u\n"
"return_ip: %pI4:%u\n"
"return_ip_xlate: %pI4:%u\n"
"return_mac: %pM\n"
"flags: valid=%x src_mac_valid=%x\n",
tuple->protocol,
original_cm->match_dev->name, original_cm->match_dev->ifindex, original_cm->match_dev->dev_addr,
original_cm->xmit_dev->name, original_cm->xmit_dev->ifindex, original_cm->xmit_dev->dev_addr,
original_cm->xmit_src_mac, original_cm->xmit_dest_mac, original_cm->flags, original_cm->l2_hdr_size,
&tuple->flow_ip, ntohs(tuple->flow_ident),
&msg->conn_rule.flow_ip_xlate, ntohs(msg->conn_rule.flow_ident_xlate),
msg->conn_rule.flow_mac,
reply_cm->match_dev->name, reply_cm->match_dev->ifindex, reply_cm->match_dev->dev_addr,
reply_cm->xmit_dev->name, reply_cm->xmit_dev->ifindex, reply_cm->xmit_dev->dev_addr,
reply_cm->xmit_src_mac, reply_cm->xmit_dest_mac, reply_cm->flags, reply_cm->l2_hdr_size,
&tuple->return_ip, ntohs(tuple->return_ident),
&msg->conn_rule.return_ip_xlate, ntohs(msg->conn_rule.return_ident_xlate),
msg->conn_rule.return_mac,
msg->valid_flags, msg->src_mac_rule.mac_valid_flags);
return 0;
}
/*
* sfe_ipv4_destroy_rule()
* Destroy a forwarding rule.
*/
void sfe_ipv4_destroy_rule(struct sfe_ipv4_rule_destroy_msg *msg)
{
struct sfe_ipv4 *si = &__si;
struct sfe_ipv4_connection *c;
bool ret;
struct sfe_ipv4_5tuple *tuple = &msg->tuple;
this_cpu_inc(si->stats_pcpu->connection_destroy_requests64);
spin_lock_bh(&si->lock);
/*
* Check to see if we have a flow that matches the rule we're trying
* to destroy. If there isn't then we can't destroy it.
*/
c = sfe_ipv4_find_connection(si, tuple->protocol, tuple->flow_ip, tuple->flow_ident,
tuple->return_ip, tuple->return_ident);
if (!c) {
spin_unlock_bh(&si->lock);
this_cpu_inc(si->stats_pcpu->connection_destroy_misses64);
DEBUG_TRACE("connection does not exist - p: %d, s: %pI4:%u, d: %pI4:%u\n",
tuple->protocol, &tuple->flow_ip, ntohs(tuple->flow_ident),
&tuple->return_ip, ntohs(tuple->return_ident));
return;
}
/*
* Remove our connection details from the hash tables.
*/
ret = sfe_ipv4_remove_connection(si, c);
spin_unlock_bh(&si->lock);
if (ret) {
sfe_ipv4_flush_connection(si, c, SFE_SYNC_REASON_DESTROY);
}
DEBUG_INFO("connection destroyed - p: %d, s: %pI4:%u, d: %pI4:%u\n",
tuple->protocol, &tuple->flow_ip, ntohs(tuple->flow_ident),
&tuple->return_ip, ntohs(tuple->return_ident));
}
/*
* sfe_ipv4_register_sync_rule_callback()
* Register a callback for rule synchronization.
*/
void sfe_ipv4_register_sync_rule_callback(sfe_sync_rule_callback_t sync_rule_callback)
{
struct sfe_ipv4 *si = &__si;
spin_lock_bh(&si->lock);
rcu_assign_pointer(si->sync_rule_callback, sync_rule_callback);
spin_unlock_bh(&si->lock);
}
/*
* sfe_ipv4_get_debug_dev()
*/
static ssize_t sfe_ipv4_get_debug_dev(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct sfe_ipv4 *si = &__si;
ssize_t count;
int num;
spin_lock_bh(&si->lock);
num = si->debug_dev;
spin_unlock_bh(&si->lock);
count = snprintf(buf, (ssize_t)PAGE_SIZE, "%d\n", num);
return count;
}
/*
* sysfs attributes.
*/
static const struct device_attribute sfe_ipv4_debug_dev_attr =
__ATTR(debug_dev, S_IWUSR | S_IRUGO, sfe_ipv4_get_debug_dev, NULL);
/*
* sfe_ipv4_destroy_all_rules_for_dev()
* Destroy all connections that match a particular device.
*
* If we pass dev as NULL then this destroys all connections.
*/
void sfe_ipv4_destroy_all_rules_for_dev(struct net_device *dev)
{
struct sfe_ipv4 *si = &__si;
struct sfe_ipv4_connection *c;
bool ret;
another_round:
spin_lock_bh(&si->lock);
for (c = si->all_connections_head; c; c = c->all_connections_next) {
/*
* Does this connection relate to the device we are destroying?
*/
if (!dev
|| (dev == c->original_dev)
|| (dev == c->reply_dev)) {
break;
}
}
if (c) {
ret = sfe_ipv4_remove_connection(si, c);
}
spin_unlock_bh(&si->lock);
if (c) {
if (ret) {
sfe_ipv4_flush_connection(si, c, SFE_SYNC_REASON_DESTROY);
}
goto another_round;
}
}
/*
* sfe_ipv4_periodic_sync()
*/
static void sfe_ipv4_periodic_sync(struct work_struct *work)
{
struct sfe_ipv4 *si = container_of((struct delayed_work *)work, struct sfe_ipv4, sync_dwork);
u64 now_jiffies;
int quota;
sfe_sync_rule_callback_t sync_rule_callback;
struct sfe_ipv4_connection *c;
now_jiffies = get_jiffies_64();
rcu_read_lock();
sync_rule_callback = rcu_dereference(si->sync_rule_callback);
if (!sync_rule_callback) {
rcu_read_unlock();
goto done;
}
spin_lock_bh(&si->lock);
/*
* If we have reached the end of the connection list, walk from
* the connection head.
*/
c = si->wc_next;
if (unlikely(!c)) {
c = si->all_connections_head;
}
/*
* Get an estimate of the number of connections to parse in this sync.
*/
quota = (si->num_connections + 63) / 64;
/*
* Walk the "all connection" list and sync the connection state.
*/
while (likely(c && quota)) {
struct sfe_ipv4_connection_match *cm;
struct sfe_ipv4_connection_match *counter_cm;
struct sfe_connection_sync sis;
cm = c->original_match;
counter_cm = c->reply_match;
/*
* Didn't receive packets in the original direction or reply
* direction, move to the next connection.
*/
if ((!atomic_read(&cm->rx_packet_count)) && !(atomic_read(&counter_cm->rx_packet_count))) {
c = c->all_connections_next;
continue;
}
quota--;
sfe_ipv4_gen_sync_connection(si, c, &sis, SFE_SYNC_REASON_STATS, now_jiffies);
si->wc_next = c->all_connections_next;
/*
* We don't want to be holding the lock when we sync!
*/
spin_unlock_bh(&si->lock);
sync_rule_callback(&sis);
spin_lock_bh(&si->lock);
/*
* c must be set and used in the same lock/unlock window;
* because c could be removed when we don't hold the lock,
* so delay grabbing until after the callback and relock.
*/
c = si->wc_next;
}
/*
* At the end of the sync, put the wc_next to the connection we left.
*/
si->wc_next = c;
spin_unlock_bh(&si->lock);
rcu_read_unlock();
done:
schedule_delayed_work_on(si->work_cpu, (struct delayed_work *)work, ((HZ + 99) / 100));
}
#define CHAR_DEV_MSG_SIZE 768
/*
* sfe_ipv4_debug_dev_read_start()
* Generate part of the XML output.
*/
static bool sfe_ipv4_debug_dev_read_start(struct sfe_ipv4 *si, char *buffer, char *msg, size_t *length,
int *total_read, struct sfe_ipv4_debug_xml_write_state *ws)
{
int bytes_read;
si->debug_read_seq++;
bytes_read = snprintf(msg, CHAR_DEV_MSG_SIZE, "<sfe_ipv4>\n");
if (copy_to_user(buffer + *total_read, msg, CHAR_DEV_MSG_SIZE)) {
return false;
}
*length -= bytes_read;
*total_read += bytes_read;
ws->state++;
return true;
}
/*
* sfe_ipv4_debug_dev_read_connections_start()
* Generate part of the XML output.
*/
static bool sfe_ipv4_debug_dev_read_connections_start(struct sfe_ipv4 *si, char *buffer, char *msg, size_t *length,
int *total_read, struct sfe_ipv4_debug_xml_write_state *ws)
{
int bytes_read;
bytes_read = snprintf(msg, CHAR_DEV_MSG_SIZE, "\t<connections>\n");
if (copy_to_user(buffer + *total_read, msg, CHAR_DEV_MSG_SIZE)) {
return false;
}
*length -= bytes_read;
*total_read += bytes_read;
ws->state++;
return true;
}
/*
* sfe_ipv4_debug_dev_read_connections_connection()
* Generate part of the XML output.
*/
static bool sfe_ipv4_debug_dev_read_connections_connection(struct sfe_ipv4 *si, char *buffer, char *msg, size_t *length,
int *total_read, struct sfe_ipv4_debug_xml_write_state *ws)
{
struct sfe_ipv4_connection *c;
struct sfe_ipv4_connection_match *original_cm;
struct sfe_ipv4_connection_match *reply_cm;
int bytes_read;
int protocol;
struct net_device *src_dev;
__be32 src_ip;
__be32 src_ip_xlate;
__be16 src_port;
__be16 src_port_xlate;
u64 src_rx_packets;
u64 src_rx_bytes;
struct net_device *dest_dev;
__be32 dest_ip;
__be32 dest_ip_xlate;
__be16 dest_port;
__be16 dest_port_xlate;
u64 dest_rx_packets;
u64 dest_rx_bytes;
u64 last_sync_jiffies;
u32 src_mark, dest_mark, src_priority, dest_priority, src_dscp, dest_dscp;
u32 packet, byte, original_cm_flags;
u16 pppoe_session_id;
u8 pppoe_remote_mac[ETH_ALEN];
u32 original_fast_xmit, reply_fast_xmit;
#ifdef CONFIG_NF_FLOW_COOKIE
int src_flow_cookie, dst_flow_cookie;
#endif
spin_lock_bh(&si->lock);
for (c = si->all_connections_head; c; c = c->all_connections_next) {
if (c->debug_read_seq < si->debug_read_seq) {
c->debug_read_seq = si->debug_read_seq;
break;
}
}
/*
* If there were no connections then move to the next state.
*/
if (!c || c->removed) {
spin_unlock_bh(&si->lock);
ws->state++;
return true;
}
original_cm = c->original_match;
reply_cm = c->reply_match;
protocol = c->protocol;
src_dev = c->original_dev;
src_ip = c->src_ip;
src_ip_xlate = c->src_ip_xlate;
src_port = c->src_port;
src_port_xlate = c->src_port_xlate;
src_priority = original_cm->priority;
src_dscp = original_cm->dscp >> SFE_IPV4_DSCP_SHIFT;
sfe_ipv4_connection_match_update_summary_stats(original_cm, &packet, &byte);
sfe_ipv4_connection_match_update_summary_stats(reply_cm, &packet, &byte);
src_rx_packets = original_cm->rx_packet_count64;
src_rx_bytes = original_cm->rx_byte_count64;
src_mark = original_cm->mark;
original_fast_xmit = (original_cm->flags & SFE_IPV4_CONNECTION_MATCH_FLAG_FAST_XMIT);
dest_dev = c->reply_dev;
dest_ip = c->dest_ip;
dest_ip_xlate = c->dest_ip_xlate;
dest_port = c->dest_port;
dest_port_xlate = c->dest_port_xlate;
dest_priority = reply_cm->priority;
dest_dscp = reply_cm->dscp >> SFE_IPV4_DSCP_SHIFT;
dest_rx_packets = reply_cm->rx_packet_count64;
dest_rx_bytes = reply_cm->rx_byte_count64;
dest_mark = reply_cm->mark;
reply_fast_xmit = (reply_cm->flags & SFE_IPV4_CONNECTION_MATCH_FLAG_FAST_XMIT);
last_sync_jiffies = get_jiffies_64() - c->last_sync_jiffies;
original_cm_flags = original_cm->flags;
pppoe_session_id = original_cm->pppoe_session_id;
ether_addr_copy(pppoe_remote_mac, original_cm->pppoe_remote_mac);
#ifdef CONFIG_NF_FLOW_COOKIE
src_flow_cookie = original_cm->flow_cookie;
dst_flow_cookie = reply_cm->flow_cookie;
#endif
spin_unlock_bh(&si->lock);
bytes_read = snprintf(msg, CHAR_DEV_MSG_SIZE, "\t\t<connection "
"protocol=\"%u\" "
"src_dev=\"%s\" "
"src_ip=\"%pI4\" src_ip_xlate=\"%pI4\" "
"src_port=\"%u\" src_port_xlate=\"%u\" "
"src_priority=\"%u\" src_dscp=\"%u\" "
"src_rx_pkts=\"%llu\" src_rx_bytes=\"%llu\" "
"src_mark=\"%08x\" "
"src_fast_xmit=\"%s\" "
"dest_dev=\"%s\" "
"dest_ip=\"%pI4\" dest_ip_xlate=\"%pI4\" "
"dest_port=\"%u\" dest_port_xlate=\"%u\" "
"dest_priority=\"%u\" dest_dscp=\"%u\" "
"dest_rx_pkts=\"%llu\" dest_rx_bytes=\"%llu\" "
"dest_mark=\"%08x\" "
"reply_fast_xmit=\"%s\" "
#ifdef CONFIG_NF_FLOW_COOKIE
"src_flow_cookie=\"%d\" dst_flow_cookie=\"%d\" "
#endif
"last_sync=\"%llu\" ",
protocol,
src_dev->name,
&src_ip, &src_ip_xlate,
ntohs(src_port), ntohs(src_port_xlate),
src_priority, src_dscp,
src_rx_packets, src_rx_bytes,
src_mark,
original_fast_xmit ? "Yes" : "No",
dest_dev->name,
&dest_ip, &dest_ip_xlate,
ntohs(dest_port), ntohs(dest_port_xlate),
dest_priority, dest_dscp,
dest_rx_packets, dest_rx_bytes,
dest_mark,
reply_fast_xmit ? "Yes" : "No",
#ifdef CONFIG_NF_FLOW_COOKIE
src_flow_cookie, dst_flow_cookie,
#endif
last_sync_jiffies);
if (original_cm_flags &= (SFE_IPV4_CONNECTION_MATCH_FLAG_PPPOE_DECAP | SFE_IPV4_CONNECTION_MATCH_FLAG_PPPOE_ENCAP)) {
bytes_read += snprintf(msg + bytes_read, CHAR_DEV_MSG_SIZE, "pppoe_session_id=\"%u\" pppoe_server MAC=\"%pM\" ",
pppoe_session_id, pppoe_remote_mac);
}
bytes_read += snprintf(msg + bytes_read, CHAR_DEV_MSG_SIZE, "/>\n");
if (copy_to_user(buffer + *total_read, msg, CHAR_DEV_MSG_SIZE)) {
return false;
}
*length -= bytes_read;
*total_read += bytes_read;
return true;
}
/*
* sfe_ipv4_debug_dev_read_connections_end()
* Generate part of the XML output.
*/
static bool sfe_ipv4_debug_dev_read_connections_end(struct sfe_ipv4 *si, char *buffer, char *msg, size_t *length,
int *total_read, struct sfe_ipv4_debug_xml_write_state *ws)
{
int bytes_read;
bytes_read = snprintf(msg, CHAR_DEV_MSG_SIZE, "\t</connections>\n");
if (copy_to_user(buffer + *total_read, msg, CHAR_DEV_MSG_SIZE)) {
return false;
}
*length -= bytes_read;
*total_read += bytes_read;
ws->state++;
return true;
}
/*
* sfe_ipv4_debug_dev_read_exceptions_start()
* Generate part of the XML output.
*/
static bool sfe_ipv4_debug_dev_read_exceptions_start(struct sfe_ipv4 *si, char *buffer, char *msg, size_t *length,
int *total_read, struct sfe_ipv4_debug_xml_write_state *ws)
{
int bytes_read;
bytes_read = snprintf(msg, CHAR_DEV_MSG_SIZE, "\t<exceptions>\n");
if (copy_to_user(buffer + *total_read, msg, CHAR_DEV_MSG_SIZE)) {
return false;
}
*length -= bytes_read;
*total_read += bytes_read;
ws->state++;
return true;
}
/*
* sfe_ipv4_debug_dev_read_exceptions_exception()
* Generate part of the XML output.
*/
static bool sfe_ipv4_debug_dev_read_exceptions_exception(struct sfe_ipv4 *si, char *buffer, char *msg, size_t *length,
int *total_read, struct sfe_ipv4_debug_xml_write_state *ws)
{
int i;
u64 val = 0;
for_each_possible_cpu(i) {
const struct sfe_ipv4_stats *s = per_cpu_ptr(si->stats_pcpu, i);
val += s->exception_events64[ws->iter_exception];
}
if (val) {
int bytes_read;
bytes_read = snprintf(msg, CHAR_DEV_MSG_SIZE,
"\t\t<exception name=\"%s\" count=\"%llu\" />\n",
sfe_ipv4_exception_events_string[ws->iter_exception],
val);
if (copy_to_user(buffer + *total_read, msg, CHAR_DEV_MSG_SIZE)) {
return false;
}
*length -= bytes_read;
*total_read += bytes_read;
}
ws->iter_exception++;
if (ws->iter_exception >= SFE_IPV4_EXCEPTION_EVENT_LAST) {
ws->iter_exception = 0;
ws->state++;
}
return true;
}
/*
* sfe_ipv4_debug_dev_read_exceptions_end()
* Generate part of the XML output.
*/
static bool sfe_ipv4_debug_dev_read_exceptions_end(struct sfe_ipv4 *si, char *buffer, char *msg, size_t *length,
int *total_read, struct sfe_ipv4_debug_xml_write_state *ws)
{
int bytes_read;
bytes_read = snprintf(msg, CHAR_DEV_MSG_SIZE, "\t</exceptions>\n");
if (copy_to_user(buffer + *total_read, msg, CHAR_DEV_MSG_SIZE)) {
return false;
}
*length -= bytes_read;
*total_read += bytes_read;
ws->state++;
return true;
}
/*
* sfe_ipv4_debug_dev_read_stats()
* Generate part of the XML output.
*/
static bool sfe_ipv4_debug_dev_read_stats(struct sfe_ipv4 *si, char *buffer, char *msg, size_t *length,
int *total_read, struct sfe_ipv4_debug_xml_write_state *ws)
{
int bytes_read;
struct sfe_ipv4_stats stats;
unsigned int num_conn;
sfe_ipv4_update_summary_stats(si, &stats);
spin_lock_bh(&si->lock);
num_conn = si->num_connections;
spin_unlock_bh(&si->lock);
bytes_read = snprintf(msg, CHAR_DEV_MSG_SIZE, "\t<stats "
"num_connections=\"%u\" "
"pkts_dropped=\"%llu\" "
"pkts_fast_xmited=\"%llu\" "
"pkts_forwarded=\"%llu\" pkts_not_forwarded=\"%llu\" "
"create_requests=\"%llu\" create_collisions=\"%llu\" "
"create_failures=\"%llu\" "
"destroy_requests=\"%llu\" destroy_misses=\"%llu\" "
"flushes=\"%llu\" "
"hash_hits=\"%llu\" hash_reorders=\"%llu\" "
"pppoe_encap_pkts_fwded=\"%llu\" "
"pppoe_decap_pkts_fwded=\"%llu\" "
"pppoe_bridge_pkts_fwded=\"%llu\" />\n",
num_conn,
stats.packets_dropped64,
stats.packets_fast_xmited64,
stats.packets_forwarded64,
stats.packets_not_forwarded64,
stats.connection_create_requests64,
stats.connection_create_collisions64,
stats.connection_create_failures64,
stats.connection_destroy_requests64,
stats.connection_destroy_misses64,
stats.connection_flushes64,
stats.connection_match_hash_hits64,
stats.connection_match_hash_reorders64,
stats.pppoe_encap_packets_forwarded64,
stats.pppoe_decap_packets_forwarded64,
stats.pppoe_bridge_packets_forwarded64);
if (copy_to_user(buffer + *total_read, msg, CHAR_DEV_MSG_SIZE)) {
return false;
}
*length -= bytes_read;
*total_read += bytes_read;
ws->state++;
return true;
}
/*
* sfe_ipv4_debug_dev_read_end()
* Generate part of the XML output.
*/
static bool sfe_ipv4_debug_dev_read_end(struct sfe_ipv4 *si, char *buffer, char *msg, size_t *length,
int *total_read, struct sfe_ipv4_debug_xml_write_state *ws)
{
int bytes_read;
bytes_read = snprintf(msg, CHAR_DEV_MSG_SIZE, "</sfe_ipv4>\n");
if (copy_to_user(buffer + *total_read, msg, CHAR_DEV_MSG_SIZE)) {
return false;
}
*length -= bytes_read;
*total_read += bytes_read;
ws->state++;
return true;
}
/*
* Array of write functions that write various XML elements that correspond to
* our XML output state machine.
*/
static sfe_ipv4_debug_xml_write_method_t sfe_ipv4_debug_xml_write_methods[SFE_IPV4_DEBUG_XML_STATE_DONE] = {
sfe_ipv4_debug_dev_read_start,
sfe_ipv4_debug_dev_read_connections_start,
sfe_ipv4_debug_dev_read_connections_connection,
sfe_ipv4_debug_dev_read_connections_end,
sfe_ipv4_debug_dev_read_exceptions_start,
sfe_ipv4_debug_dev_read_exceptions_exception,
sfe_ipv4_debug_dev_read_exceptions_end,
sfe_ipv4_debug_dev_read_stats,
sfe_ipv4_debug_dev_read_end,
};
/*
* sfe_ipv4_debug_dev_read()
* Send info to userspace upon read request from user
*/
static ssize_t sfe_ipv4_debug_dev_read(struct file *filp, char *buffer, size_t length, loff_t *offset)
{
char msg[CHAR_DEV_MSG_SIZE];
int total_read = 0;
struct sfe_ipv4_debug_xml_write_state *ws;
struct sfe_ipv4 *si = &__si;
ws = (struct sfe_ipv4_debug_xml_write_state *)filp->private_data;
while ((ws->state != SFE_IPV4_DEBUG_XML_STATE_DONE) && (length > CHAR_DEV_MSG_SIZE)) {
if ((sfe_ipv4_debug_xml_write_methods[ws->state])(si, buffer, msg, &length, &total_read, ws)) {
continue;
}
}
return total_read;
}
/*
* sfe_ipv4_debug_dev_open()
*/
static int sfe_ipv4_debug_dev_open(struct inode *inode, struct file *file)
{
struct sfe_ipv4_debug_xml_write_state *ws;
ws = (struct sfe_ipv4_debug_xml_write_state *)file->private_data;
if (!ws) {
ws = kzalloc(sizeof(struct sfe_ipv4_debug_xml_write_state), GFP_KERNEL);
if (!ws) {
return -ENOMEM;
}
ws->state = SFE_IPV4_DEBUG_XML_STATE_START;
file->private_data = ws;
}
return 0;
}
/*
* sfe_ipv4_debug_dev_release()
*/
static int sfe_ipv4_debug_dev_release(struct inode *inode, struct file *file)
{
struct sfe_ipv4_debug_xml_write_state *ws;
ws = (struct sfe_ipv4_debug_xml_write_state *)file->private_data;
if (ws) {
/*
* We've finished with our output so free the write state.
*/
kfree(ws);
file->private_data = NULL;
}
return 0;
}
/*
* File operations used in the debug char device
*/
static struct file_operations sfe_ipv4_debug_dev_fops = {
.read = sfe_ipv4_debug_dev_read,
.open = sfe_ipv4_debug_dev_open,
.release = sfe_ipv4_debug_dev_release
};
#ifdef CONFIG_NF_FLOW_COOKIE
/*
* sfe_register_flow_cookie_cb
* register a function in SFE to let SFE use this function to configure flow cookie for a flow
*
* Hardware driver which support flow cookie should register a callback function in SFE. Then SFE
* can use this function to configure flow cookie for a flow.
* return: 0, success; !=0, fail
*/
int sfe_register_flow_cookie_cb(flow_cookie_set_func_t cb)
{
struct sfe_ipv4 *si = &__si;
BUG_ON(!cb);
if (si->flow_cookie_set_func) {
return -1;
}
rcu_assign_pointer(si->flow_cookie_set_func, cb);
return 0;
}
/*
* sfe_unregister_flow_cookie_cb
* unregister function which is used to configure flow cookie for a flow
*
* return: 0, success; !=0, fail
*/
int sfe_unregister_flow_cookie_cb(flow_cookie_set_func_t cb)
{
struct sfe_ipv4 *si = &__si;
RCU_INIT_POINTER(si->flow_cookie_set_func, NULL);
return 0;
}
/*
* sfe_ipv4_get_flow_cookie()
*/
static ssize_t sfe_ipv4_get_flow_cookie(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct sfe_ipv4 *si = &__si;
return snprintf(buf, (ssize_t)PAGE_SIZE, "%d\n", si->flow_cookie_enable);
}
/*
* sfe_ipv4_set_flow_cookie()
*/
static ssize_t sfe_ipv4_set_flow_cookie(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct sfe_ipv4 *si = &__si;
si->flow_cookie_enable = simple_strtol(buf, NULL, 0);
return size;
}
/*
* sysfs attributes.
*/
static const struct device_attribute sfe_ipv4_flow_cookie_attr =
__ATTR(flow_cookie_enable, S_IWUSR | S_IRUGO, sfe_ipv4_get_flow_cookie, sfe_ipv4_set_flow_cookie);
#endif /*CONFIG_NF_FLOW_COOKIE*/
/*
* sfe_ipv4_get_cpu()
*/
static ssize_t sfe_ipv4_get_cpu(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct sfe_ipv4 *si = &__si;
return snprintf(buf, (ssize_t)PAGE_SIZE, "%d\n", si->work_cpu);
}
/*
* sfe_ipv4_set_cpu()
*/
static ssize_t sfe_ipv4_set_cpu(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct sfe_ipv4 *si = &__si;
int work_cpu;
work_cpu = simple_strtol(buf, NULL, 0);
if ((work_cpu >= 0) && (work_cpu <= NR_CPUS)) {
si->work_cpu = work_cpu;
} else {
dev_err(dev, "%s is not in valid range[0,%d]", buf, NR_CPUS);
}
return size;
}
/*
* sysfs attributes.
*/
static const struct device_attribute sfe_ipv4_cpu_attr =
__ATTR(stats_work_cpu, S_IWUSR | S_IRUGO, sfe_ipv4_get_cpu, sfe_ipv4_set_cpu);
/*
* DSCP rewrite table
*/
static ssize_t
sfe_ipv4_get_dscp_rewrite_mark_to_match(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct sfe_ipv4 *si = &__si;
return snprintf(buf, (ssize_t)PAGE_SIZE, "0x%x\n",
si->dscp_rewrite_mark_to_match);
}
static ssize_t
sfe_ipv4_set_dscp_rewrite_mark_to_match(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct sfe_ipv4 *si = &__si;
int ret;
u32 mark_to_match;
ret = kstrtou32(buf, 0, &mark_to_match);
if (ret)
return ret;
si->dscp_rewrite_mark_to_match = mark_to_match;
return size;
}
static const struct device_attribute sfe_ipv4_dscp_rewrite_mark_to_match_attr =
__ATTR(dscp_rewrite_mark_to_match, S_IWUSR | S_IRUGO,
sfe_ipv4_get_dscp_rewrite_mark_to_match,
sfe_ipv4_set_dscp_rewrite_mark_to_match);
static ssize_t
sfe_ipv4_get_dscp_rewrite_dscp_to_set(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct sfe_ipv4 *si = &__si;
return snprintf(buf, (ssize_t)PAGE_SIZE, "0x%x\n",
si->dscp_rewrite_dscp_to_set >> SFE_IPV4_DSCP_SHIFT);
}
static ssize_t
sfe_ipv4_set_dscp_rewrite_dscp_to_set(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
struct sfe_ipv4 *si = &__si;
int ret;
u32 dscp_to_set;
ret = kstrtou32(buf, 0, &dscp_to_set);
if (ret)
return ret;
si->dscp_rewrite_dscp_to_set = dscp_to_set << SFE_IPV4_DSCP_SHIFT;
return size;
}
static const struct device_attribute sfe_ipv4_dscp_rewrite_dscp_to_set_attr =
__ATTR(dscp_rewrite_dscp_to_set, S_IWUSR | S_IRUGO,
sfe_ipv4_get_dscp_rewrite_dscp_to_set,
sfe_ipv4_set_dscp_rewrite_dscp_to_set);
/*
* sfe_ipv4_conn_match_hash_init()
* Initialize conn match hash lists
*/
static void sfe_ipv4_conn_match_hash_init(struct sfe_ipv4 *si, int len)
{
struct hlist_head *hash_list = si->hlist_conn_match_hash_head;
int i;
for (i = 0; i < len; i++) {
INIT_HLIST_HEAD(&hash_list[i]);
}
}
#ifdef SFE_PROCESS_LOCAL_OUT
/*
* sfe_ipv4_local_out()
* Called for packets from ip_local_out() - post encapsulation & other packets
*/
static unsigned int sfe_ipv4_local_out(void *priv, struct sk_buff *skb, const struct nf_hook_state *nhs)
{
struct sfe_l2_info l2_info = {0};
DEBUG_TRACE("%px: sfe: sfe_ipv4_local_out hook called.\n", skb);
if (likely(skb->skb_iif)) {
return sfe_ipv4_recv(skb->dev, skb, &l2_info, true) ? NF_STOLEN : NF_ACCEPT;
}
return NF_ACCEPT;
}
/*
* struct nf_hook_ops sfe_ipv4_ops_local_out[]
* Hooks into netfilter local out packet monitoring points.
*/
static struct nf_hook_ops sfe_ipv4_ops_local_out[] __read_mostly = {
/*
* Local out routing hook is used to monitor packets.
*/
{
.hook = sfe_ipv4_local_out,
.pf = PF_INET,
.hooknum = NF_INET_LOCAL_OUT,
.priority = NF_IP_PRI_FIRST,
},
};
#endif
/*
* sfe_ipv4_init()
*/
int sfe_ipv4_init(void)
{
struct sfe_ipv4 *si = &__si;
int result = -1;
DEBUG_INFO("SFE IPv4 init\n");
sfe_ipv4_conn_match_hash_init(si, ARRAY_SIZE(si->hlist_conn_match_hash_head));
si->stats_pcpu = alloc_percpu_gfp(struct sfe_ipv4_stats, GFP_KERNEL | __GFP_ZERO);
if (!si->stats_pcpu) {
DEBUG_ERROR("failed to allocate stats memory for sfe_ipv4\n");
goto exit0;
}
/*
* Create sys/sfe_ipv4
*/
si->sys_ipv4 = kobject_create_and_add("sfe_ipv4", NULL);
if (!si->sys_ipv4) {
DEBUG_ERROR("failed to register sfe_ipv4\n");
goto exit1;
}
/*
* Create files, one for each parameter supported by this module.
*/
result = sysfs_create_file(si->sys_ipv4, &sfe_ipv4_debug_dev_attr.attr);
if (result) {
DEBUG_ERROR("failed to register debug dev file: %d\n", result);
goto exit2;
}
result = sysfs_create_file(si->sys_ipv4, &sfe_ipv4_cpu_attr.attr);
if (result) {
DEBUG_ERROR("failed to register debug dev file: %d\n", result);
goto exit3;
}
result = sysfs_create_file(si->sys_ipv4,
&sfe_ipv4_dscp_rewrite_mark_to_match_attr.attr);
if (result) {
DEBUG_ERROR("failed to register DSCP rewrite mark_to_match file: %d\n",
result);
goto exit4;
}
result = sysfs_create_file(si->sys_ipv4,
&sfe_ipv4_dscp_rewrite_dscp_to_set_attr.attr);
if (result) {
DEBUG_ERROR("failed to register DSCP rewrite dscp_to_set file: %d\n",
result);
goto exit5;
}
#ifdef CONFIG_NF_FLOW_COOKIE
result = sysfs_create_file(si->sys_ipv4, &sfe_ipv4_flow_cookie_attr.attr);
if (result) {
DEBUG_ERROR("failed to register flow cookie enable file: %d\n", result);
goto exit6;
}
#endif /* CONFIG_NF_FLOW_COOKIE */
#ifdef SFE_PROCESS_LOCAL_OUT
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0))
result = nf_register_hooks(sfe_ipv4_ops_local_out, ARRAY_SIZE(sfe_ipv4_ops_local_out));
#else
result = nf_register_net_hooks(&init_net, sfe_ipv4_ops_local_out, ARRAY_SIZE(sfe_ipv4_ops_local_out));
#endif
if (result < 0) {
DEBUG_ERROR("can't register nf local out hook: %d\n", result);
goto exit7;
}
DEBUG_INFO("Register nf local out hook success: %d\n", result);
#endif
/*
* Register our debug char device.
*/
result = register_chrdev(0, "sfe_ipv4", &sfe_ipv4_debug_dev_fops);
if (result < 0) {
DEBUG_ERROR("Failed to register chrdev: %d\n", result);
goto exit8;
}
si->debug_dev = result;
si->work_cpu = WORK_CPU_UNBOUND;
/*
* Create a work to handle periodic statistics.
*/
INIT_DELAYED_WORK(&(si->sync_dwork), sfe_ipv4_periodic_sync);
schedule_delayed_work_on(si->work_cpu, &(si->sync_dwork), ((HZ + 99) / 100));
spin_lock_init(&si->lock);
return 0;
exit8:
#ifdef SFE_PROCESS_LOCAL_OUT
DEBUG_TRACE("sfe: Unregister local out hook\n");
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0))
nf_unregister_hooks(sfe_ipv4_ops_local_out, ARRAY_SIZE(sfe_ipv4_ops_local_out));
#else
nf_unregister_net_hooks(&init_net, sfe_ipv4_ops_local_out, ARRAY_SIZE(sfe_ipv4_ops_local_out));
#endif
exit7:
#endif
#ifdef CONFIG_NF_FLOW_COOKIE
sysfs_remove_file(si->sys_ipv4, &sfe_ipv4_flow_cookie_attr.attr);
exit6:
#endif /* CONFIG_NF_FLOW_COOKIE */
sysfs_remove_file(si->sys_ipv4,
&sfe_ipv4_dscp_rewrite_dscp_to_set_attr.attr);
exit5:
sysfs_remove_file(si->sys_ipv4,
&sfe_ipv4_dscp_rewrite_mark_to_match_attr.attr);
exit4:
sysfs_remove_file(si->sys_ipv4, &sfe_ipv4_cpu_attr.attr);
exit3:
sysfs_remove_file(si->sys_ipv4, &sfe_ipv4_debug_dev_attr.attr);
exit2:
kobject_put(si->sys_ipv4);
exit1:
free_percpu(si->stats_pcpu);
exit0:
return result;
}
/*
* sfe_ipv4_exit()
*/
void sfe_ipv4_exit(void)
{
struct sfe_ipv4 *si = &__si;
DEBUG_INFO("SFE IPv4 exit\n");
/*
* Destroy all connections.
*/
sfe_ipv4_destroy_all_rules_for_dev(NULL);
cancel_delayed_work_sync(&si->sync_dwork);
unregister_chrdev(si->debug_dev, "sfe_ipv4");
#ifdef SFE_PROCESS_LOCAL_OUT
DEBUG_TRACE("sfe: Unregister local out hook\n");
#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 13, 0))
nf_unregister_hooks(sfe_ipv4_ops_local_out, ARRAY_SIZE(sfe_ipv4_ops_local_out));
#else
nf_unregister_net_hooks(&init_net, sfe_ipv4_ops_local_out, ARRAY_SIZE(sfe_ipv4_ops_local_out));
#endif
#endif
#ifdef CONFIG_NF_FLOW_COOKIE
sysfs_remove_file(si->sys_ipv4, &sfe_ipv4_flow_cookie_attr.attr);
#endif /* CONFIG_NF_FLOW_COOKIE */
sysfs_remove_file(si->sys_ipv4,
&sfe_ipv4_dscp_rewrite_dscp_to_set_attr.attr);
sysfs_remove_file(si->sys_ipv4,
&sfe_ipv4_dscp_rewrite_mark_to_match_attr.attr);
sysfs_remove_file(si->sys_ipv4, &sfe_ipv4_debug_dev_attr.attr);
sysfs_remove_file(si->sys_ipv4, &sfe_ipv4_cpu_attr.attr);
kobject_put(si->sys_ipv4);
free_percpu(si->stats_pcpu);
}
#ifdef CONFIG_NF_FLOW_COOKIE
EXPORT_SYMBOL(sfe_register_flow_cookie_cb);
EXPORT_SYMBOL(sfe_unregister_flow_cookie_cb);
#endif