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-rw-r--r--src/plugins/pppoe/pppoe_tap_node.c297
1 files changed, 297 insertions, 0 deletions
diff --git a/src/plugins/pppoe/pppoe_tap_node.c b/src/plugins/pppoe/pppoe_tap_node.c
new file mode 100644
index 00000000..f1e0a501
--- /dev/null
+++ b/src/plugins/pppoe/pppoe_tap_node.c
@@ -0,0 +1,297 @@
+/*
+ *------------------------------------------------------------------
+ * Copyright (c) 2017 Intel 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 pemplied.
+ * See the License for the specific language governing permissions and
+ * lpemitations under the License.
+ *------------------------------------------------------------------
+ */
+
+#include <vlib/vlib.h>
+#include <vnet/ppp/packet.h>
+#include <pppoe/pppoe.h>
+
+vlib_node_registration_t pppoe_tap_dispatch_node;
+
+#define foreach_pppoe_tap_next \
+_(DROP, "error-drop") \
+_(TUNTAP, "tuntap-tx" ) \
+_(INTERFACE, "interface-output" ) \
+
+typedef enum
+{
+#define _(s,n) PPPOE_TAP_NEXT_##s,
+ foreach_pppoe_tap_next
+#undef _
+ PPPOE_TAP_N_NEXT,
+} pppoe_tap_next_t;
+
+typedef struct {
+ u32 next_index;
+ u32 sw_if_index;
+ u32 tap_if_index;
+ u8 pppoe_code;
+ u16 ppp_proto;
+ u32 error;
+} pppoe_tap_trace_t;
+
+static u8 * format_pppoe_tap_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ pppoe_tap_trace_t * t = va_arg (*args, pppoe_tap_trace_t *);
+ pppoe_main_t * pem = &pppoe_main;
+
+ if (t->sw_if_index != pem->tap_if_index)
+ {
+ s = format (s, "PPPoE dispatch from sw_if_index %d next %d error %d \n"
+ " pppoe_code 0x%x ppp_proto 0x%x",
+ t->sw_if_index, t->next_index, t->error,
+ t->pppoe_code, t->ppp_proto);
+ }
+ else
+ {
+ s = format (s, "PPPoE dispatch from tap_if_index %d next %d error %d \n"
+ " pppoe_code 0x%x ppp_proto 0x%x",
+ t->tap_if_index, t->next_index, t->error,
+ t->pppoe_code, t->ppp_proto);
+ }
+ return s;
+}
+
+/**
+ * Perform learning on one packet based on the mac table lookup result.
+ * */
+static_always_inline void
+pppoe_learn_process (vlib_node_runtime_t * node,
+ pppoe_main_t * pem,
+ vlib_buffer_t * b0,
+ u32 sw_if_index0,
+ pppoe_entry_key_t * key0,
+ pppoe_entry_key_t * cached_key,
+ u32 * bucket0,
+ pppoe_entry_result_t * result0)
+{
+ /* Check mac table lookup result */
+ if (PREDICT_TRUE (result0->fields.sw_if_index == sw_if_index0))
+ {
+ /*
+ * The entry was in the table, and the sw_if_index matched, the normal case
+ */
+ return;
+ }
+ else if (result0->fields.sw_if_index == ~0)
+ {
+ /* The entry was not in table, so add it */
+ result0->fields.sw_if_index = sw_if_index0;
+ result0->fields.session_index = ~0;
+ cached_key->raw = ~0; /* invalidate the cache */
+ }
+ else
+ {
+ /* The entry was in the table, but with the wrong sw_if_index mapping (mac move) */
+ result0->fields.sw_if_index = sw_if_index0;
+ }
+
+ /* Update the entry */
+ BVT (clib_bihash_kv) kv;
+ kv.key = key0->raw;
+ kv.value = result0->raw;
+ BV (clib_bihash_add_del) (&pem->session_table, &kv, 1 /* is_add */ );
+}
+
+static uword
+pppoe_tap_dispatch (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ u32 n_left_from, next_index, * from, * to_next;
+ pppoe_main_t * pem = &pppoe_main;
+ vnet_main_t * vnm = pem->vnet_main;
+ vnet_interface_main_t * im = &vnm->interface_main;
+ u32 pkts_decapsulated = 0;
+ u32 thread_index = vlib_get_thread_index();
+ u32 stats_sw_if_index, stats_n_packets, stats_n_bytes;
+ pppoe_entry_key_t cached_key;
+ pppoe_entry_result_t cached_result;
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
+
+ /* Clear the one-entry cache in case session table was updated */
+ cached_key.raw = ~0;
+ cached_result.raw = ~0; /* warning be gone */
+
+ next_index = node->cached_next_index;
+ stats_sw_if_index = node->runtime_data[0];
+ stats_n_packets = stats_n_bytes = 0;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index,
+ to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t * b0;
+ ethernet_header_t *h0;
+ pppoe_header_t * pppoe0;
+ pppoe_entry_key_t key0;
+ pppoe_entry_result_t result0;
+
+ u32 bucket0;
+ u32 next0;
+ u32 error0 = 0;
+ u32 rx_sw_if_index0=~0, tx_sw_if_index0=~0, len0;
+ vnet_hw_interface_t *hi;
+ vnet_sw_interface_t *si;
+
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ /* leaves current_data pointing at the pppoe header */
+ pppoe0 = vlib_buffer_get_current (b0);
+ rx_sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
+
+ if (PREDICT_FALSE (pppoe0->ver_type != PPPOE_VER_TYPE))
+ {
+ error0 = PPPOE_ERROR_BAD_VER_TYPE;
+ next0 = PPPOE_INPUT_NEXT_DROP;
+ goto trace00;
+ }
+
+ vlib_buffer_reset(b0);
+ h0 = vlib_buffer_get_current (b0);
+
+ if(rx_sw_if_index0 == pem->tap_if_index)
+ {
+ pppoe_lookup_1 (&pem->session_table, &cached_key, &cached_result,
+ h0->dst_address, 0,
+ &key0, &bucket0, &result0);
+ tx_sw_if_index0 = result0.fields.sw_if_index;
+
+ if (PREDICT_FALSE (tx_sw_if_index0 == ~0))
+ {
+ error0 = PPPOE_ERROR_NO_SUCH_SESSION;
+ next0 = PPPOE_INPUT_NEXT_DROP;
+ goto trace00;
+ }
+
+ next0 = PPPOE_TAP_NEXT_INTERFACE;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
+
+ /* set src mac address */
+ si = vnet_get_sw_interface(vnm, tx_sw_if_index0);
+ hi = vnet_get_hw_interface (vnm, si->hw_if_index);
+ clib_memcpy (vlib_buffer_get_current (b0)+6, hi->hw_address, 6);
+ }
+ else
+ {
+ pppoe_lookup_1 (&pem->session_table, &cached_key, &cached_result,
+ h0->src_address, pppoe0->session_id,
+ &key0, &bucket0, &result0);
+ tx_sw_if_index0 = result0.fields.sw_if_index;
+
+ /* learn client session */
+ pppoe_learn_process (node, pem, b0, rx_sw_if_index0,
+ &key0, &cached_key,
+ &bucket0, &result0);
+
+ next0 = PPPOE_TAP_NEXT_TUNTAP;
+ vnet_buffer(b0)->sw_if_index[VLIB_TX] = pem->tap_if_index;
+ }
+
+ len0 = vlib_buffer_length_in_chain (vm, b0);
+
+ pkts_decapsulated ++;
+ stats_n_packets += 1;
+ stats_n_bytes += len0;
+
+ /* Batch stats increment on the same pppoe session so counter
+ is not incremented per packet */
+ if (PREDICT_FALSE (rx_sw_if_index0 != stats_sw_if_index))
+ {
+ stats_n_packets -= 1;
+ stats_n_bytes -= len0;
+ if (stats_n_packets)
+ vlib_increment_combined_counter
+ (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
+ thread_index, stats_sw_if_index,
+ stats_n_packets, stats_n_bytes);
+ stats_n_packets = 1;
+ stats_n_bytes = len0;
+ stats_sw_if_index = rx_sw_if_index0;
+ }
+
+ trace00:
+ b0->error = error0 ? node->errors[error0] : 0;
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ pppoe_tap_trace_t *tr
+ = vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->next_index = next0;
+ tr->error = error0;
+ tr->sw_if_index = tx_sw_if_index0;
+ tr->tap_if_index = pem->tap_if_index;
+ tr->pppoe_code = pppoe0->code;
+ tr->ppp_proto = clib_net_to_host_u16(pppoe0->ppp_proto);
+ }
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+ /* Do we still need this now that session tx stats is kept? */
+ vlib_node_increment_counter (vm, pppoe_input_node.index,
+ PPPOE_ERROR_DECAPSULATED,
+ pkts_decapsulated);
+
+ /* Increment any remaining batch stats */
+ if (stats_n_packets)
+ {
+ vlib_increment_combined_counter
+ (im->combined_sw_if_counters + VNET_INTERFACE_COUNTER_RX,
+ thread_index, stats_sw_if_index, stats_n_packets, stats_n_bytes);
+ node->runtime_data[0] = stats_sw_if_index;
+ }
+
+ return from_frame->n_vectors;
+}
+
+VLIB_REGISTER_NODE (pppoe_tap_dispatch_node) = {
+ .function = pppoe_tap_dispatch,
+ .name = "pppoe-tap-dispatch",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+
+ .n_next_nodes = PPPOE_TAP_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [PPPOE_TAP_NEXT_##s] = n,
+ foreach_pppoe_tap_next
+#undef _
+ },
+
+ .format_trace = format_pppoe_tap_trace,
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (pppoe_tap_dispatch_node, pppoe_tap_dispatch)
+