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Diffstat (limited to 'plugins/vcgn-plugin/vcgn/cnat_ipv4_tcp_inside_input.c')
-rw-r--r--plugins/vcgn-plugin/vcgn/cnat_ipv4_tcp_inside_input.c424
1 files changed, 424 insertions, 0 deletions
diff --git a/plugins/vcgn-plugin/vcgn/cnat_ipv4_tcp_inside_input.c b/plugins/vcgn-plugin/vcgn/cnat_ipv4_tcp_inside_input.c
new file mode 100644
index 00000000000..5bea707385c
--- /dev/null
+++ b/plugins/vcgn-plugin/vcgn/cnat_ipv4_tcp_inside_input.c
@@ -0,0 +1,424 @@
+/*
+ *---------------------------------------------------------------------------
+ * cnat_ipv4_tcp_inside_input.c - cnat_ipv4_tcp_inside_input node pipeline
+ * stage 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_db.h"
+#include "tcp_header_definitions.h"
+#include "cnat_config.h"
+#include "cnat_global.h"
+#include "cnat_v4_functions.h"
+
+#define foreach_cnat_ipv4_tcp_inside_input_error \
+_(CNAT_V4_TCP_I2O_PKT_IN, "tcp i2o packets received") \
+_(CNAT_V4_TCP_I2O_PKT_T, "tcp i2o packets natted") \
+_(CNAT_V4_TCP_I2O_EXCEPTION, "packets to tcp i2o exception") \
+_(CNAT_V4_TCP_I2O_TTL_GEN, "generated TTL expiry ICMP packets") \
+_(CNAT_V4_TCP_I2O_TTL_GEN_DROP, "could not generate TTL expiry ICMP packets") \
+_(CNAT_V4_TCP_I2O_SESSION_DROP, "could not generate session") \
+_(CNAT_V4_UDP_I2O_FRAG_DROP, "non-first fragment drop")
+
+typedef enum {
+#define _(sym,str) sym,
+ foreach_cnat_ipv4_tcp_inside_input_error
+#undef _
+ CNAT_IPV4_TCP_INSIDE_INPUT_N_ERROR,
+} cnat_ipv4_tcp_inside_input_t;
+
+static char * cnat_ipv4_tcp_inside_input_error_strings[] = {
+#define _(sym,string) string,
+ foreach_cnat_ipv4_tcp_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_tcp_inside_input_main_t;
+
+typedef enum {
+ CNAT_V4_TCP_I2O_E,
+ CNAT_V4_TCP_I2O_T,
+ CNAT_V4_TCP_I2O_D,
+ CNAT_V4_TCP_I2O_NEXT,
+} cnat_ipv4_tcp_inside_input_next_t;
+
+#define CNAT_REWRITE_OUTPUT CNAT_V4_TCP_I2O_T
+#define CNAT_V4_ICMP_GEN CNAT_V4_TCP_I2O_D
+
+//#define CNAT_V4_TCP_I2O_E CNAT_V4_TCP_I2O_D //remove it once exception node is created
+cnat_ipv4_tcp_inside_input_main_t cnat_ipv4_tcp_inside_input_main;
+vlib_node_registration_t cnat_ipv4_tcp_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
+
+
+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;
+ //cnat_feature_data_t *fd = (cnat_feature_data_t *)ctx->feature_data;
+
+
+ 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;
+ tcp_hdr_type *tcp = (tcp_hdr_type *)((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 (tcp->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_TCP)
+ 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 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_TCP_I2O_T;
+ int counter = CNAT_V4_TCP_I2O_PKT_T;
+
+ ipv4_header *ip = (ipv4_header *)vlib_buffer_get_current(b0);
+ u8 ipv4_hdr_len = (ip->version_hdr_len_words & 0xf) << 2;
+ tcp_hdr_type *tcp = (tcp_hdr_type *)((u8*)ip + ipv4_hdr_len);
+ vlib_node_t *n = vlib_get_node (vm, cnat_ipv4_tcp_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_main_db_entry_t *db = NULL;
+ cnat_key_t dest_info;
+ u32 window;
+ u8 scale;
+
+
+ INCREMENT_NODE_COUNTER(CNAT_V4_TCP_I2O_PKT_IN);
+
+ 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_TCP_I2O_TTL_GEN;
+ } else {
+ /* Could not generated ICMP - drop the packet */
+ disposition = CNAT_V4_TCP_I2O_D;
+ counter = CNAT_V4_TCP_I2O_TTL_GEN_DROP;
+ }
+ goto drop_pkt;
+ }
+ }
+
+ if (PREDICT_FALSE(db_index == EMPTY)) {
+ /* Deleted fragment code from here */
+ disposition = CNAT_V4_TCP_I2O_E;
+ counter = CNAT_V4_TCP_I2O_EXCEPTION;
+ } else {
+ db = cnat_main_db + db_index;
+
+ /* Handle destination sessions */
+ dest_info.k.port = clib_net_to_host_u16(tcp->dest_port);
+ dest_info.k.ipv4 = clib_net_to_host_u32(ip->dest_addr);
+
+ 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;
+ goto update_pkt;
+ }
+
+ if(PREDICT_FALSE(db->dst_ipv4 != dest_info.k.ipv4 ||
+ db->dst_port != dest_info.k.port)) {
+ if(PREDICT_TRUE(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);
+ } else if(PREDICT_FALSE(db->nsessions == 1)) {
+ /* Destn is not same as in main db. Multiple session
+ * scenario
+ */
+ dest_info.k.vrf = db->in2out_key.k.vrf;
+ session_db = cnat_handle_1to2_session(db, &dest_info);
+ if(PREDICT_FALSE(session_db == NULL)) {
+ disposition = CNAT_V4_TCP_I2O_D;
+ counter = CNAT_V4_TCP_I2O_SESSION_DROP;
+ goto drop_pkt;
+ }
+ } else { /* There are already multiple destinations */
+ 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)) {
+ disposition = CNAT_V4_TCP_I2O_D;
+ counter = CNAT_V4_TCP_I2O_SESSION_DROP;
+ goto drop_pkt;
+ }
+ }
+ if(PREDICT_TRUE(session_db != 0)) {
+ /* Have to repeat the window size check for new destinations */
+ window = (u32)clib_net_to_host_u16(tcp->window_size);
+ window = window << session_db->scale;
+ if(PREDICT_TRUE(!session_db->window)) {
+ calculate_window_scale(tcp, &scale);
+ session_db->scale = scale;
+ session_db->window = window;
+ } else if (PREDICT_FALSE(session_db->window <
+ window)) {
+ /* Update the db entry with window option from packet */
+ session_db->window = window;
+ } else {
+ /* Do nothing */
+ }
+ session_db->tcp_seq_num = clib_net_to_host_u32(tcp->seq_num);
+ session_db->ack_no = clib_net_to_host_u32(tcp->ack_num);
+#if DEBUG > 1
+ printf("\n In2out SDB stages seq no = %u,"
+ " ack no = %u, window = %u\n",
+ session_db->tcp_seq_num,
+ session_db->ack_no,
+ session_db->window);
+#endif
+
+ }
+ } else {
+ //Update the seq no and ack no for subsequent communication
+ //after connection establishment
+ //No need to update window here. Window is already updated
+ //during connection establishment
+ window = (u32)clib_net_to_host_u16(tcp->window_size);
+ window = window << db->scale;
+ if(PREDICT_FALSE(!ALG_ENABLED_DB(db))) {
+ //This check is done since proto_data is part of union in main
+ //db entry
+ db->proto_data.tcp_seq_chk.seq_no =
+ clib_net_to_host_u32(tcp->seq_num);
+ db->proto_data.tcp_seq_chk.ack_no =
+ clib_net_to_host_u32(tcp->ack_num);
+ }
+ if (PREDICT_FALSE(db->diff_window < window)) {
+ /* Update the db entry with window option from packet */
+ db->diff_window = window;
+ }
+#if DEBUG > 1
+ printf("\n In2out MainDB seq no = %u,"
+ "\n ack no = %u\n",
+ db->proto_data.tcp_seq_chk.seq_no,
+ db->proto_data.tcp_seq_chk.ack_no);
+ printf("\n In2out MAINDB window = %u\n",
+ db->diff_window);
+#endif
+ }
+update_pkt:
+
+ counter = CNAT_V4_TCP_I2O_PKT_T;
+ disposition = CNAT_V4_TCP_I2O_T;
+
+ /* NO FRAGMENT & ALG HANDLING. DELETING THE CODE */
+
+ if (PLATFORM_HANDLE_TTL_DECREMENT) {
+ /*
+ * Decrement TTL and update IPv4 checksum
+ */
+ ipv4_decr_ttl_n_calc_csum(ip);
+ }
+
+ tcp_in2out_nat_mss_n_checksum(ip,
+ tcp,
+ db->out2in_key.k.ipv4,
+ db->out2in_key.k.port,
+ db
+ /*, db->in2out_key.k.vrf */);
+
+ /* update transaltion counters */
+ db->in2out_pkts++;
+ in2out_forwarding_count++;
+
+ /* update the timer for good mode, or evil mode dst_ip match */
+
+ if(PREDICT_FALSE(session_db != NULL)) {
+ V4_TCP_UPDATE_SESSION_DB_FLAG(session_db, tcp);
+ CNAT_DB_TIMEOUT_RST(session_db);
+ } else {
+ V4_TCP_UPDATE_SESSION_FLAG(db, tcp);
+ CNAT_DB_TIMEOUT_RST(db);
+ }
+ }
+
+drop_pkt:
+
+ em->counters[node_counter_base_index + counter] += 1;
+ return disposition;
+}
+
+#include <vnet/pipeline.h>
+
+static uword cnat_ipv4_tcp_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_tcp_inside_input_node) = {
+ .function = cnat_ipv4_tcp_inside_input_node_fn,
+ .name = "vcgn-v4-tcp-i2o",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(cnat_ipv4_tcp_inside_input_error_strings),
+ .error_strings = cnat_ipv4_tcp_inside_input_error_strings,
+
+ .n_next_nodes = CNAT_V4_TCP_I2O_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [CNAT_V4_TCP_I2O_E] = "vcgn-v4-tcp-i2o-e",
+ [CNAT_V4_TCP_I2O_T] = "ip4-input",
+ [CNAT_V4_TCP_I2O_D] = "error-drop",
+ },
+};
+
+clib_error_t *cnat_ipv4_tcp_inside_input_init (vlib_main_t *vm)
+{
+ cnat_ipv4_tcp_inside_input_main_t * mp = &cnat_ipv4_tcp_inside_input_main;
+
+ mp->vlib_main = vm;
+ mp->vnet_main = vnet_get_main();
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (cnat_ipv4_tcp_inside_input_init);