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vpp/plugins/vcgn-plugin/vcgn/cnat_ipv4_udp_inside_input.c
Ole Troan ea3e1fc875 Plugins: Clean up the plugin directory so that each plugin has its own 
directory and GNU autotools setup.

Change-Id: I6c59d1297389c9413db0c0b9bdf3b759080bf1b8
Signed-off-by: Ole Troan <ot@cisco.com>
2016-06-27 15:04:00 +00:00

509 lines
16 KiB
C
Raw Blame History

/*
*---------------------------------------------------------------------------
* cnat_ipv4_udp_inside_input.c - cnat_ipv4_udp_inside_input node functions
*
*
* Copyright (c) 2008-2014 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*---------------------------------------------------------------------------
*/
#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include <vppinfra/error.h>
#include <vnet/buffer.h>
#include "cnat_global.h"
#include "cnat_db.h"
#include "cnat_ipv4_udp.h"
#include "cnat_pcp_server.h"
#define foreach_cnat_ipv4_udp_inside_input_error \
_(CNAT_V4_UDP_I2O_T_PKT, "v4 udp i2o transmit") \
_(CNAT_V4_UDP_I2O_MISS_PKT, "v4 udp i2o db miss") \
_(CNAT_V4_UDP_I2O_TTL_GEN, "v4 udp i2o TTL gen") \
_(CNAT_V4_UDP_I2O_TTL_DROP, "v4 udp i2o TTL drop") \
_(CNAT_V4_PCP_PKT, "v4 pcp pkt") \
_(CNAT_V4_UDP_I2O_SESSION_DROP, "v4 udp i2o session drop")
typedef enum {
#define _(sym,str) sym,
foreach_cnat_ipv4_udp_inside_input_error
#undef _
CNAT_IPV4_UDP_INSIDE_INPUT_N_ERROR,
} cnat_ipv4_udp_inside_input_t;
static char * cnat_ipv4_udp_inside_input_error_strings[] = {
#define _(sym,string) string,
foreach_cnat_ipv4_udp_inside_input_error
#undef _
};
typedef struct {
u32 cached_next_index;
/* $$$$ add data here */
/* convenience variables */
vlib_main_t * vlib_main;
vnet_main_t * vnet_main;
} cnat_ipv4_udp_inside_input_main_t;
typedef enum {
CNAT_V4_I2O_FIXME,
CNAT_V4_UDP_I2O_E,
CNAT_REWRITE_OUTPUT,
CNAT_V4_UDP_I2O_T = CNAT_REWRITE_OUTPUT,
CNAT_N_NEXT,
} cnat_ipv4_udp_inside_input_next_t;
#define CNAT_V4_UDP_I2O_D CNAT_V4_I2O_FIXME
#define CNAT_V4_PCP_T CNAT_V4_I2O_FIXME
cnat_ipv4_udp_inside_input_main_t cnat_ipv4_udp_inside_input_main;
vlib_node_registration_t cnat_ipv4_udp_inside_input_node;
#define NSTAGES 6
/*
* Use the generic buffer metadata + first line of packet data prefetch
* stage function from <api/pipeline.h>. This is usually a Good Idea.
*/
#define stage0 generic_stage0
#ifndef TOBE_PORTED
static inline u32
is_pcp_pkt(u32 addr, u16 port)
{
return CNAT_NO_CONFIG;
}
#else
static inline u32
is_pcp_pkt(spp_ctx_t *ctx, u32 addr, u16 port)
{
cnat_vrfmap_t *my_vrfmap = NULL;
u16 my_vrfmap_index;
my_vrfmap_index = vrf_map_array[ctx->ru.rx.uidb_index];
if (PREDICT_TRUE(my_vrfmap_index != VRF_MAP_ENTRY_EMPTY)) {
my_vrfmap = cnat_map_by_vrf + my_vrfmap_index;
if (PREDICT_FALSE( port == my_vrfmap->pcp_server_port)) {
if(PREDICT_TRUE(addr == my_vrfmap->pcp_server_addr)) {
return CNAT_SUCCESS;
}
}
}
return CNAT_NO_CONFIG;
}
#endif
inline void swap_ip_src_udp_port(ipv4_header *ip,
udp_hdr_type_t *udp,
cnat_main_db_entry_t *db)
{
/*
* declare varibale
*/
CNAT_UPDATE_L3_L4_CHECKSUM_DECLARE
/*
* calculate checksum
*/
CNAT_UPDATE_L3_L4_CHECKSUM(((u16)(db->in2out_key.k.ipv4)),
((u16)(db->in2out_key.k.ipv4 >> 16)),
(db->in2out_key.k.port),
(clib_net_to_host_u16(ip->checksum)),
(clib_net_to_host_u16(udp->udp_checksum)),
((u16)(db->out2in_key.k.ipv4)),
((u16)(db->out2in_key.k.ipv4 >> 16)),
(db->out2in_key.k.port))
/* #define UDP_PACKET_DEBUG 1 */
// Temporary debugs which will be suppressed later
#ifdef UDP_PACKET_DEBUG
if (PREDICT_FALSE(udp_inside_packet_dump_enable)) {
printf("\nIn2Out UDP packet before translation");
print_udp_pkt(ip);
}
#endif
//set ip header
ip->src_addr =
clib_host_to_net_u32(db->out2in_key.k.ipv4);
ip->checksum =
clib_host_to_net_u16(new_l3_c);
u16 frag_offset =
clib_net_to_host_u16(ip->frag_flags_offset);
if(PREDICT_FALSE(frag_offset & IP_FRAG_OFFSET_MASK)) {
return; /* No need to update UDP fields */
}
//set udp header
udp->src_port =
clib_host_to_net_u16(db->out2in_key.k.port);
/*
* No easy way to avoid this if check except by using
* complex logic - may not be worth it.
*/
if (PREDICT_TRUE(udp->udp_checksum)) {
udp->udp_checksum =
clib_host_to_net_u16(new_l4_c);
}
// Temporary debugs which will be suppressed later
#ifdef UDP_PACKET_DEBUG
if (PREDICT_FALSE(udp_inside_checksum_disable)) {
printf("\nIn2Out UDP checksum 0x%x disabled by force", new_l4_c);
udp->udp_checksum = 0;
}
if (PREDICT_FALSE(udp_inside_packet_dump_enable)) {
printf("\nIn2Out UDP packet after translation");
print_udp_pkt(ip);
}
#endif
}
static inline void
stage1(vlib_main_t * vm, vlib_node_runtime_t * node, u32 buffer_index)
{
u64 a, b, c;
u32 bucket;
u8 *prefetch_target;
vlib_buffer_t * b0 = vlib_get_buffer (vm, buffer_index);
ipv4_header *ip = vlib_buffer_get_current (b0);
u8 ipv4_hdr_len = (ip->version_hdr_len_words & 0xf) << 2;
udp_hdr_type_t *udp = (udp_hdr_type_t *)((u8*)ip + ipv4_hdr_len);
u64 tmp = 0;
tmp = vnet_buffer(b0)->vcgn_uii.key.k.ipv4 =
clib_net_to_host_u32(ip->src_addr);
vnet_buffer(b0)->vcgn_uii.key.k.port =
clib_net_to_host_u16 (udp->src_port);
tmp |= ((u64)vnet_buffer(b0)->vcgn_uii.key.k.port) << 32;
PLATFORM_CNAT_SET_RX_VRF(vnet_buffer(b0)->sw_if_index[VLIB_RX],
vnet_buffer(b0)->vcgn_uii.key.k.vrf,
CNAT_UDP)
tmp |= ((u64)vnet_buffer(b0)->vcgn_uii.key.k.vrf) << 48;
CNAT_V4_GET_HASH(tmp, bucket, CNAT_MAIN_HASH_MASK)
prefetch_target = (u8 *)(&cnat_in2out_hash[bucket]);
vnet_buffer(b0)->vcgn_uii.bucket = bucket;
/* Prefetch the hash bucket */
CLIB_PREFETCH(prefetch_target, CLIB_CACHE_LINE_BYTES, LOAD);
}
static inline void
stage2(vlib_main_t * vm, vlib_node_runtime_t * node, u32 buffer_index)
{ /* nothing */ }
#define SPP_LOG2_CACHE_LINE_BYTES 6
#define SPP_CACHE_LINE_BYTES (1 << SPP_LOG2_CACHE_LINE_BYTES)
static inline void
stage3(vlib_main_t * vm, vlib_node_runtime_t * node, u32 buffer_index)
{
vlib_buffer_t * b0 = vlib_get_buffer(vm, buffer_index);
uword prefetch_target0, prefetch_target1;
u32 bucket = vnet_buffer(b0)->vcgn_uii.bucket;
/* read the hash bucket */
u32 db_index = vnet_buffer(b0)->vcgn_uii.bucket
= cnat_in2out_hash[bucket].next;
if (PREDICT_TRUE(db_index != EMPTY)) {
/*
* Prefetch database keys. We save space by not cache-line
* aligning the DB entries. We don't want to waste LSU
* bandwidth prefetching stuff we won't need.
*/
prefetch_target0 = (uword)(cnat_main_db + db_index);
CLIB_PREFETCH((void*)prefetch_target0, CLIB_CACHE_LINE_BYTES, LOAD);
/* Just beyond DB key #2 */
prefetch_target1 = prefetch_target0 +
STRUCT_OFFSET_OF(cnat_main_db_entry_t, user_ports);
/* If the targets are in different lines, do the second prefetch */
if (PREDICT_FALSE((prefetch_target0 & ~(SPP_CACHE_LINE_BYTES-1)) !=
(prefetch_target1 & ~(SPP_CACHE_LINE_BYTES-1)))) {
CLIB_PREFETCH((void *)prefetch_target1, CLIB_CACHE_LINE_BYTES, LOAD);
}
}
}
static inline void
stage4(vlib_main_t * vm, vlib_node_runtime_t * node, u32 buffer_index)
{
cnat_main_db_entry_t *db;
vlib_buffer_t * b0 = vlib_get_buffer(vm, buffer_index);
u32 db_index = vnet_buffer(b0)->vcgn_uii.bucket;
/*
* Note: if the search already failed (empty bucket),
* the answer is already in the pipeline context structure
*/
if (PREDICT_TRUE(db_index != EMPTY)) {
/*
* Note: hash collisions suck. We can't easily prefetch around them.
* The first trip around the track will be fast. After that, maybe
* not so much...
*/
do {
db = cnat_main_db + db_index;
if (PREDICT_TRUE(db->in2out_key.key64 ==
vnet_buffer(b0)->vcgn_uii.key.key64)) {
break;
}
db_index = db->in2out_hash.next;
} while (db_index != EMPTY);
/* Stick the answer back into the pipeline context structure */
vnet_buffer(b0)->vcgn_uii.bucket = db_index;
}
}
static u64 pkt_num = 0;
static inline u32 last_stage (vlib_main_t *vm, vlib_node_runtime_t *node,
u32 bi)
{
vlib_buffer_t *b0 = vlib_get_buffer (vm, bi);
u32 db_index = vnet_buffer(b0)->vcgn_uii.bucket;
spp_ctx_t *ctx = (spp_ctx_t *) &vnet_buffer(b0)->vcgn_uii;
int disposition = CNAT_V4_UDP_I2O_T;
int counter = CNAT_V4_UDP_I2O_T_PKT;
ipv4_header *ip = (ipv4_header *)vlib_buffer_get_current(b0);
u8 ipv4_hdr_len = (ip->version_hdr_len_words & 0xf) << 2;
udp_hdr_type_t *udp = (udp_hdr_type_t *)((u8*)ip + ipv4_hdr_len);
vlib_node_t *n = vlib_get_node (vm, cnat_ipv4_udp_inside_input_node.index);
u32 node_counter_base_index = n->error_heap_index;
vlib_error_main_t * em = &vm->error_main;
cnat_session_entry_t *session_db = NULL;
cnat_key_t dest_info;
pkt_num++;
if(PREDICT_FALSE(is_pcp_pkt(ip->dest_addr, udp->dest_port) ==
CNAT_SUCCESS))
{
PCP_INCR(input);
disposition = CNAT_V4_PCP_T;
counter = CNAT_V4_PCP_PKT;
goto pcp_pkt;
}
if (PLATFORM_HANDLE_TTL_DECREMENT) {
if (PREDICT_FALSE(ip->ttl <= 1)) {
/* Try to generate ICMP error msg, as TTL is <= 1 */
if (icmpv4_generate_with_throttling
(ctx, ip, ctx->ru.rx.uidb_index)) {
/* Generated ICMP */
disposition = CNAT_REWRITE_OUTPUT;
counter = CNAT_V4_UDP_I2O_TTL_GEN;
} else {
/* Could not generated ICMP - drop the packet */
disposition = CNAT_V4_UDP_I2O_D;
counter = CNAT_V4_UDP_I2O_TTL_DROP;
}
goto drop_pkt;
}
}
if (PREDICT_TRUE(db_index != EMPTY)) {
cnat_main_db_entry_t *db = cnat_main_db + db_index;
dest_info.k.ipv4 = clib_net_to_host_u32(ip->dest_addr);
/* MUST revisit: it seems farg is set to 1 for few packets & because of
* this the port is not updated & it becomes 0. Commenting teporarily
* this fargment check & setting dst port with udp dst port value */
dest_info.k.port = clib_net_to_host_u16(udp->dest_port);
#if 0 // DONOT REMOVE THIS if 0
if(PREDICT_FALSE(ctx->ru.rx.frag)) {
#ifdef TOBE_PORTED
/* Must have routed through cnat_v4_frag_in2out node */
u16 *feature_data_ports = (u16 *)&ctx->feature_data[4];
dest_info.k.port = *feature_data_ports;
#endif
} else {
dest_info.k.port = clib_net_to_host_u16(udp->dest_port);
}
#endif
if (PLATFORM_HANDLE_TTL_DECREMENT) {
/*
* Decrement TTL and update IPv4 checksum
*/
ipv4_decr_ttl_n_calc_csum(ip);
}
if(PREDICT_TRUE(!PLATFORM_DBL_SUPPORT)) {
/* No DBL support, so just update the destn and proceed */
db->dst_ipv4 = dest_info.k.ipv4;
db->dst_port = dest_info.k.port;
CNAT_DB_TIMEOUT_RST(db);
goto update_pkt;
}
if(PREDICT_TRUE((db->dst_ipv4 == dest_info.k.ipv4) &&
(db->dst_port == dest_info.k.port))) {
CNAT_DB_TIMEOUT_RST(db);
goto update_pkt;
} else {
if (PREDICT_FALSE(db->nsessions == 0)) {
/* Should be a static entry
* Note this session as the first session and log
*/
cnat_add_dest_n_log(db, &dest_info);
/*
* update db counter, timer
*/
CNAT_DB_TIMEOUT_RST(db);
} else if(PREDICT_TRUE(db->nsessions == 1)) {
/* Destn is not same as in main db. Multiple session
* scenario
*/
//printf(">>> [pkt# %lu] src_ip: 0x%x, db ip: 0x%x, db port: %u; dest ip: 0x%x, dest port: %u\n",
// pkt_num, ntohl(ip->src_addr), db->dst_ipv4, db->dst_port, dest_info.k.ipv4, dest_info.k.port);
dest_info.k.vrf = db->in2out_key.k.vrf;
session_db = cnat_handle_1to2_session(db, &dest_info);
if(PREDICT_TRUE(session_db != NULL)) {
/* session exists */
CNAT_DB_TIMEOUT_RST(session_db);
} else {
/* could not create session db - drop packet */
disposition = CNAT_V4_UDP_I2O_D;
counter = CNAT_V4_UDP_I2O_SESSION_DROP;
goto drop_pkt;
}
} else {
/* More than 2 sessions exists */
dest_info.k.vrf = db->in2out_key.k.vrf;
/* If session already exists,
* cnat_create_session_db_entry will return the existing db
* else create a new db
* If could not create, return NULL
*/
session_db = cnat_create_session_db_entry(&dest_info,
db, TRUE);
if(PREDICT_FALSE(session_db != NULL)) {
/* session exists */
CNAT_DB_TIMEOUT_RST(session_db);
} else {
/* could not create session db - drop packet */
disposition = CNAT_V4_UDP_I2O_D;
counter = CNAT_V4_UDP_I2O_SESSION_DROP;
goto drop_pkt;
}
}
}
update_pkt:
/*
* 1. update src ipv4 addr and src udp port
* 2. update ipv4 checksum and udp checksum
*/
swap_ip_src_udp_port(ip, udp, db);
/*
* update db counter, timer
*/
db->in2out_pkts++;
/*
* need to set outside vrf
* from db->out2in_key.k.vrf
*/
/* Temporarily keeping this commented */
//PLATFORM_CNAT_SET_TX_VRF(vnet_buffer(b0)->sw_if_index[VLIB_TX],
// db->out2in_key.k.vrf)
in2out_forwarding_count++;
} else {
disposition = CNAT_V4_UDP_I2O_E;
counter = CNAT_V4_UDP_I2O_MISS_PKT;
}
drop_pkt:
pcp_pkt:
em->counters[node_counter_base_index + counter] += 1;
return disposition;
}
#include <vnet/pipeline.h>
static uword cnat_ipv4_udp_inside_input_node_fn (vlib_main_t * vm,
vlib_node_runtime_t * node,
vlib_frame_t * frame)
{
return dispatch_pipeline (vm, node, frame);
}
VLIB_REGISTER_NODE (cnat_ipv4_udp_inside_input_node) = {
.function = cnat_ipv4_udp_inside_input_node_fn,
.name = "vcgn-v4-udp-i2o",
.vector_size = sizeof (u32),
.type = VLIB_NODE_TYPE_INTERNAL,
.n_errors = ARRAY_LEN(cnat_ipv4_udp_inside_input_error_strings),
.error_strings = cnat_ipv4_udp_inside_input_error_strings,
.n_next_nodes = CNAT_N_NEXT,
/* edit / add dispositions here */
.next_nodes = {
[CNAT_V4_I2O_FIXME] = "error-drop",
// [CNAT_V4_UDP_I2O_T] = "ip4-input",
[CNAT_V4_UDP_I2O_E] = "vcgn-v4-udp-i2o-e",
[CNAT_REWRITE_OUTPUT] = "ip4-input",
},
};
clib_error_t *cnat_ipv4_udp_inside_input_init (vlib_main_t *vm)
{
cnat_ipv4_udp_inside_input_main_t * mp = &cnat_ipv4_udp_inside_input_main;
mp->vlib_main = vm;
mp->vnet_main = vnet_get_main();
return 0;
}
VLIB_INIT_FUNCTION (cnat_ipv4_udp_inside_input_init);
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