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>

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);