--- /dev/null
+/*
+ * Copyright (c) 2018 SUSE LLC.
+ * 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 <sctp/sctp.h>
+#include <sctp/sctp_debug.h>
+#include <vppinfra/random.h>
+#include <openssl/hmac.h>
+
+u32
+ip6_sctp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
+ ip6_header_t * ip0, int *bogus_lengthp);
+
+u32
+ip4_sctp_compute_checksum (vlib_main_t * vm, vlib_buffer_t * p0,
+ ip4_header_t * ip0);
+
+#define foreach_sctp4_output_next \
+ _ (DROP, "error-drop") \
+ _ (IP_LOOKUP, "ip4-lookup")
+
+#define foreach_sctp6_output_next \
+ _ (DROP, "error-drop") \
+ _ (IP_LOOKUP, "ip6-lookup")
+
+static char *sctp_error_strings[] = {
+#define sctp_error(n,s) s,
+#include <sctp/sctp_error.def>
+#undef sctp_error
+};
+
+typedef enum _sctp_output_next
+{
+ SCTP_OUTPUT_NEXT_DROP,
+ SCTP_OUTPUT_NEXT_IP_LOOKUP,
+ SCTP_OUTPUT_N_NEXT
+} sctp_output_next_t;
+
+typedef struct
+{
+ sctp_header_t sctp_header;
+ sctp_connection_t sctp_connection;
+} sctp_tx_trace_t;
+
+always_inline u8
+sctp_is_retransmitting (sctp_connection_t * sctp_conn, u8 idx)
+{
+ return sctp_conn->sub_conn[idx].is_retransmitting;
+}
+
+always_inline uword
+sctp46_output_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame, int is_ip4)
+{
+ u32 n_left_from, next_index, *from, *to_next;
+ u32 my_thread_index = vm->thread_index;
+
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = from_frame->n_vectors;
+ next_index = node->cached_next_index;
+ sctp_set_time_now (my_thread_index);
+
+ 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;
+ sctp_header_t *sctp_hdr = 0;
+ sctp_connection_t *sctp_conn;
+ sctp_tx_trace_t *t0;
+ sctp_header_t *th0 = 0;
+ u32 error0 = SCTP_ERROR_PKTS_SENT, next0 =
+ SCTP_OUTPUT_NEXT_IP_LOOKUP;
+
+#if SCTP_DEBUG_STATE_MACHINE
+ u16 packet_length = 0;
+#endif
+
+ 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);
+
+ sctp_conn =
+ sctp_connection_get (sctp_buffer_opaque (b0)->
+ sctp.connection_index, my_thread_index);
+
+ if (PREDICT_FALSE (sctp_conn == 0))
+ {
+ error0 = SCTP_ERROR_INVALID_CONNECTION;
+ next0 = SCTP_OUTPUT_NEXT_DROP;
+ goto done;
+ }
+
+ u8 idx = sctp_buffer_opaque (b0)->sctp.subconn_idx;
+
+ th0 = vlib_buffer_get_current (b0);
+
+ if (is_ip4)
+ {
+ ip4_header_t *iph4 = vlib_buffer_push_ip4 (vm,
+ b0,
+ &sctp_conn->sub_conn
+ [idx].connection.
+ lcl_ip.ip4,
+ &sctp_conn->
+ sub_conn
+ [idx].connection.
+ rmt_ip.ip4,
+ IP_PROTOCOL_SCTP, 1);
+
+ u32 checksum = ip4_sctp_compute_checksum (vm, b0, iph4);
+
+ sctp_hdr = ip4_next_header (iph4);
+ sctp_hdr->checksum = checksum;
+
+ vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
+
+#if SCTP_DEBUG_STATE_MACHINE
+ packet_length = clib_net_to_host_u16 (iph4->length);
+#endif
+ }
+ else
+ {
+ ip6_header_t *iph6 = vlib_buffer_push_ip6 (vm,
+ b0,
+ &sctp_conn->sub_conn
+ [idx].
+ connection.lcl_ip.
+ ip6,
+ &sctp_conn->sub_conn
+ [idx].
+ connection.rmt_ip.
+ ip6,
+ IP_PROTOCOL_SCTP);
+
+ int bogus = ~0;
+ u32 checksum = ip6_sctp_compute_checksum (vm, b0, iph6, &bogus);
+ ASSERT (!bogus);
+
+ sctp_hdr = ip6_next_header (iph6);
+ sctp_hdr->checksum = checksum;
+
+ vnet_buffer (b0)->l3_hdr_offset = (u8 *) iph6 - b0->data;
+ vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
+
+#if SCTP_DEBUG_STATE_MACHINE
+ packet_length = clib_net_to_host_u16 (iph6->payload_length);
+#endif
+ }
+
+ sctp_full_hdr_t *full_hdr = (sctp_full_hdr_t *) sctp_hdr;
+ u8 chunk_type = vnet_sctp_get_chunk_type (&full_hdr->common_hdr);
+ if (chunk_type >= UNKNOWN)
+ {
+ clib_warning
+ ("Trying to send an unrecognized chunk... something is really bad.");
+ error0 = SCTP_ERROR_UNKNOWN_CHUNK;
+ next0 = SCTP_OUTPUT_NEXT_DROP;
+ goto done;
+ }
+
+#if SCTP_DEBUG_STATE_MACHINE
+ u8 is_valid =
+ (sctp_conn->sub_conn[idx].connection.lcl_port ==
+ sctp_hdr->src_port
+ || sctp_conn->sub_conn[idx].connection.lcl_port ==
+ sctp_hdr->dst_port)
+ && (sctp_conn->sub_conn[idx].connection.rmt_port ==
+ sctp_hdr->dst_port
+ || sctp_conn->sub_conn[idx].connection.rmt_port ==
+ sctp_hdr->src_port);
+
+ if (!is_valid)
+ {
+ SCTP_DBG_STATE_MACHINE ("BUFFER IS INCORRECT: conn_index = %u, "
+ "packet_length = %u, "
+ "chunk_type = %u [%s], "
+ "connection.lcl_port = %u, sctp_hdr->src_port = %u, "
+ "connection.rmt_port = %u, sctp_hdr->dst_port = %u",
+ sctp_conn->sub_conn[idx].
+ connection.c_index, packet_length,
+ chunk_type,
+ sctp_chunk_to_string (chunk_type),
+ sctp_conn->sub_conn[idx].
+ connection.lcl_port, sctp_hdr->src_port,
+ sctp_conn->sub_conn[idx].
+ connection.rmt_port,
+ sctp_hdr->dst_port);
+
+ error0 = SCTP_ERROR_UNKNOWN_CHUNK;
+ next0 = SCTP_OUTPUT_NEXT_DROP;
+ goto done;
+ }
+#endif
+ SCTP_DBG_STATE_MACHINE
+ ("SESSION_INDEX = %u, CONN_INDEX = %u, CURR_CONN_STATE = %u (%s), "
+ "CHUNK_TYPE = %s, " "SRC_PORT = %u, DST_PORT = %u",
+ sctp_conn->sub_conn[idx].connection.s_index,
+ sctp_conn->sub_conn[idx].connection.c_index,
+ sctp_conn->state, sctp_state_to_string (sctp_conn->state),
+ sctp_chunk_to_string (chunk_type), full_hdr->hdr.src_port,
+ full_hdr->hdr.dst_port);
+
+ /* Let's make sure the state-machine does not send anything crazy */
+#if SCTP_DEBUG_STATE_MACHINE
+ if (sctp_validate_output_state_machine (sctp_conn, chunk_type) != 0)
+ {
+ SCTP_DBG_STATE_MACHINE
+ ("Sending the wrong chunk (%s) based on state-machine status (%s)",
+ sctp_chunk_to_string (chunk_type),
+ sctp_state_to_string (sctp_conn->state));
+
+ error0 = SCTP_ERROR_UNKNOWN_CHUNK;
+ next0 = SCTP_OUTPUT_NEXT_DROP;
+ goto done;
+
+ }
+#endif
+
+ /* Karn's algorithm: RTT measurements MUST NOT be made using
+ * packets that were retransmitted
+ */
+ if (!sctp_is_retransmitting (sctp_conn, idx))
+ {
+ /* Measure RTT with this */
+ if (chunk_type == DATA
+ && sctp_conn->sub_conn[idx].RTO_pending == 0)
+ {
+ sctp_conn->sub_conn[idx].RTO_pending = 1;
+ sctp_conn->sub_conn[idx].rtt_ts = sctp_time_now ();
+ }
+ else
+ sctp_conn->sub_conn[idx].rtt_ts = sctp_time_now ();
+ }
+
+ /* Let's take care of TIMERS */
+ switch (chunk_type)
+ {
+ case COOKIE_ECHO:
+ {
+ sctp_conn->state = SCTP_STATE_COOKIE_ECHOED;
+ break;
+ }
+ case DATA:
+ {
+ SCTP_ADV_DBG_OUTPUT ("PACKET_LENGTH = %u", packet_length);
+
+ sctp_timer_update (sctp_conn, idx, SCTP_TIMER_T3_RXTX,
+ sctp_conn->sub_conn[idx].RTO);
+ break;
+ }
+ case SHUTDOWN:
+ {
+ /* Start the SCTP_TIMER_T2_SHUTDOWN timer */
+ sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T2_SHUTDOWN,
+ sctp_conn->sub_conn[idx].RTO);
+ sctp_conn->state = SCTP_STATE_SHUTDOWN_SENT;
+ break;
+ }
+ case SHUTDOWN_ACK:
+ {
+ /* Start the SCTP_TIMER_T2_SHUTDOWN timer */
+ sctp_timer_set (sctp_conn, idx, SCTP_TIMER_T2_SHUTDOWN,
+ sctp_conn->sub_conn[idx].RTO);
+ sctp_conn->state = SCTP_STATE_SHUTDOWN_ACK_SENT;
+ break;
+ }
+ case SHUTDOWN_COMPLETE:
+ {
+ sctp_conn->state = SCTP_STATE_CLOSED;
+ break;
+ }
+ }
+
+ vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] =
+ sctp_conn->sub_conn[idx].c_fib_index;
+
+ b0->flags |= VNET_BUFFER_F_LOCALLY_ORIGINATED;
+
+ SCTP_DBG_STATE_MACHINE
+ ("SESSION_INDEX = %u, CONNECTION_INDEX = %u, " "NEW_STATE = %s, "
+ "CHUNK_SENT = %s", sctp_conn->sub_conn[idx].connection.s_index,
+ sctp_conn->sub_conn[idx].connection.c_index,
+ sctp_state_to_string (sctp_conn->state),
+ sctp_chunk_to_string (chunk_type));
+
+ vnet_sctp_common_hdr_params_host_to_net (&full_hdr->common_hdr);
+
+ done:
+ b0->error = node->errors[error0];
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ t0 = vlib_add_trace (vm, node, b0, sizeof (*t0));
+ if (th0)
+ {
+ clib_memcpy_fast (&t0->sctp_header, th0,
+ sizeof (t0->sctp_header));
+ }
+ else
+ {
+ clib_memset (&t0->sctp_header, 0, sizeof (t0->sctp_header));
+ }
+ clib_memcpy_fast (&t0->sctp_connection, sctp_conn,
+ sizeof (t0->sctp_connection));
+ }
+
+ 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);
+ }
+
+ return from_frame->n_vectors;
+}
+
+VLIB_NODE_FN (sctp4_output_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return sctp46_output_inline (vm, node, from_frame, 1 /* is_ip4 */ );
+}
+
+VLIB_NODE_FN (sctp6_output_node) (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return sctp46_output_inline (vm, node, from_frame, 0 /* is_ip4 */ );
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (sctp4_output_node) =
+{
+ .name = "sctp4-output",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+ .n_errors = SCTP_N_ERROR,
+ .error_strings = sctp_error_strings,
+ .n_next_nodes = SCTP_OUTPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [SCTP_OUTPUT_NEXT_##s] = n,
+ foreach_sctp4_output_next
+#undef _
+ },
+ .format_buffer = format_sctp_header,
+ .format_trace = format_sctp_tx_trace,
+};
+/* *INDENT-ON* */
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (sctp6_output_node) =
+{
+ .name = "sctp6-output",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+ .n_errors = SCTP_N_ERROR,
+ .error_strings = sctp_error_strings,
+ .n_next_nodes = SCTP_OUTPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [SCTP_OUTPUT_NEXT_##s] = n,
+ foreach_sctp6_output_next
+#undef _
+ },
+ .format_buffer = format_sctp_header,
+ .format_trace = format_sctp_tx_trace,
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
Code Review / vpp.git / blobdiff