diff options
Diffstat (limited to 'src/plugins/sctp/sctp_output_node.c')
| -rw-r--r-- | src/plugins/sctp/sctp_output_node.c | 397 |
1 files changed, 397 insertions, 0 deletions
diff --git a/src/plugins/sctp/sctp_output_node.c b/src/plugins/sctp/sctp_output_node.c new file mode 100644 index 00000000000..7bf2e896acc --- /dev/null +++ b/src/plugins/sctp/sctp_output_node.c @@ -0,0 +1,397 @@ +/* + * 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: + */ |