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-rw-r--r--plugins/vcgn-plugin/vcgn/cnat_ipv4_udp_inside_input.c508
1 files changed, 508 insertions, 0 deletions
diff --git a/plugins/vcgn-plugin/vcgn/cnat_ipv4_udp_inside_input.c b/plugins/vcgn-plugin/vcgn/cnat_ipv4_udp_inside_input.c
new file mode 100644
index 00000000000..657c5f1e64e
--- /dev/null
+++ b/plugins/vcgn-plugin/vcgn/cnat_ipv4_udp_inside_input.c
@@ -0,0 +1,508 @@
+/*
+ *---------------------------------------------------------------------------
+ * 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);