diff options
Diffstat (limited to 'src/plugins/gtpu/gtpu_decap.c')
| -rw-r--r-- | src/plugins/gtpu/gtpu_decap.c | 504 |
1 files changed, 504 insertions, 0 deletions
diff --git a/src/plugins/gtpu/gtpu_decap.c b/src/plugins/gtpu/gtpu_decap.c index 1398ebdb88f..99af7300025 100644 --- a/src/plugins/gtpu/gtpu_decap.c +++ b/src/plugins/gtpu/gtpu_decap.c @@ -1242,4 +1242,508 @@ clib_error_t * ip6_gtpu_bypass_init (vlib_main_t * vm) { return 0; } VLIB_INIT_FUNCTION (ip6_gtpu_bypass_init); + +#define foreach_gtpu_flow_error \ + _(NONE, "no error") \ + _(IP_CHECKSUM_ERROR, "Rx ip checksum errors") \ + _(IP_HEADER_ERROR, "Rx ip header errors") \ + _(UDP_CHECKSUM_ERROR, "Rx udp checksum errors") \ + _(UDP_LENGTH_ERROR, "Rx udp length errors") + +typedef enum +{ +#define _(f,s) GTPU_FLOW_ERROR_##f, + foreach_gtpu_flow_error +#undef _ +#define gtpu_error(n,s) GTPU_FLOW_ERROR_##n, +#include <gtpu/gtpu_error.def> +#undef gtpu_error + GTPU_FLOW_N_ERROR, +} gtpu_flow_error_t; + +static char *gtpu_flow_error_strings[] = { +#define _(n,s) s, + foreach_gtpu_flow_error +#undef _ +#define gtpu_error(n,s) s, +#include <gtpu/gtpu_error.def> +#undef gtpu_error +#undef _ + +}; + +#define gtpu_local_need_csum_check(_b) \ + (!(_b->flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED \ + || _b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM)) + +#define gtpu_local_csum_is_valid(_b) \ + ((_b->flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT \ + || _b->flags & VNET_BUFFER_F_OFFLOAD_UDP_CKSUM) != 0) + +static_always_inline u8 +gtpu_validate_udp_csum (vlib_main_t * vm, vlib_buffer_t *b) +{ + u32 flags = b->flags; + enum { offset = sizeof(ip4_header_t) + sizeof(udp_header_t)}; + + /* Verify UDP checksum */ + if ((flags & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0) + { + vlib_buffer_advance (b, -offset); + flags = ip4_tcp_udp_validate_checksum (vm, b); + vlib_buffer_advance (b, offset); + } + + return (flags & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; +} + +static_always_inline u8 +gtpu_check_ip (vlib_buffer_t *b, u16 payload_len) +{ + ip4_header_t * ip4_hdr = vlib_buffer_get_current(b) - + sizeof(ip4_header_t) - sizeof(udp_header_t); + u16 ip_len = clib_net_to_host_u16 (ip4_hdr->length); + u16 expected = payload_len + sizeof(ip4_header_t) + sizeof(udp_header_t); + return ip_len > expected || ip4_hdr->ttl == 0 || ip4_hdr->ip_version_and_header_length != 0x45; +} + +static_always_inline u8 +gtpu_check_ip_udp_len (vlib_buffer_t *b) +{ + ip4_header_t * ip4_hdr = vlib_buffer_get_current(b) - + sizeof(ip4_header_t) - sizeof(udp_header_t); + udp_header_t * udp_hdr = vlib_buffer_get_current(b) - sizeof(udp_header_t); + u16 ip_len = clib_net_to_host_u16 (ip4_hdr->length); + u16 udp_len = clib_net_to_host_u16 (udp_hdr->length); + return udp_len > ip_len; +} + +static_always_inline u8 +gtpu_err_code (u8 ip_err0, u8 udp_err0, u8 csum_err0) +{ + u8 error0 = GTPU_FLOW_ERROR_NONE; + if (ip_err0) + error0 = GTPU_FLOW_ERROR_IP_HEADER_ERROR; + if (udp_err0) + error0 = GTPU_FLOW_ERROR_UDP_LENGTH_ERROR; + if (csum_err0) + error0 = GTPU_FLOW_ERROR_UDP_CHECKSUM_ERROR; + return error0; +} + + +always_inline uword +gtpu_flow_input (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + u32 n_left_from, next_index, * from, * to_next; + gtpu_main_t * gtm = >pu_main; + vnet_main_t * vnm = gtm->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; + u8 ip_err0, ip_err1, udp_err0, udp_err1, csum_err0, csum_err1; + + from = vlib_frame_vector_args (from_frame); + n_left_from = from_frame->n_vectors; + + 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 >= 4 && n_left_to_next >= 2) + { + u32 bi0, bi1; + vlib_buffer_t * b0, * b1; + u32 next0, next1; + gtpu_header_t * gtpu0, * gtpu1; + u32 gtpu_hdr_len0, gtpu_hdr_len1; + u32 tunnel_index0, tunnel_index1; + gtpu_tunnel_t * t0, * t1; + u32 error0, error1; + u32 sw_if_index0, sw_if_index1, len0, len1; + u8 has_space0 = 0, has_space1 = 0; + u8 ver0, ver1; + + /* Prefetch next iteration. */ + { + vlib_buffer_t * p2, * p3; + + p2 = vlib_get_buffer (vm, from[2]); + p3 = vlib_get_buffer (vm, from[3]); + + vlib_prefetch_buffer_header (p2, LOAD); + vlib_prefetch_buffer_header (p3, LOAD); + + CLIB_PREFETCH (p2->data, 2*CLIB_CACHE_LINE_BYTES, LOAD); + CLIB_PREFETCH (p3->data, 2*CLIB_CACHE_LINE_BYTES, LOAD); + } + + bi0 = from[0]; + bi1 = from[1]; + to_next[0] = bi0; + to_next[1] = bi1; + from += 2; + to_next += 2; + n_left_to_next -= 2; + n_left_from -= 2; + + b0 = vlib_get_buffer (vm, bi0); + b1 = vlib_get_buffer (vm, bi1); + + /* udp leaves current_data pointing at the gtpu header */ + gtpu0 = vlib_buffer_get_current (b0); + gtpu1 = vlib_buffer_get_current (b1); + + len0 = vlib_buffer_length_in_chain (vm, b0); + len1 = vlib_buffer_length_in_chain (vm, b1); + + tunnel_index0 = ~0; + error0 = 0; + + tunnel_index1 = ~0; + error1 = 0; + + ip_err0 = gtpu_check_ip (b0, len0); + udp_err0 = gtpu_check_ip_udp_len (b0); + ip_err1 = gtpu_check_ip (b1, len1); + udp_err1 = gtpu_check_ip_udp_len (b1); + + if (PREDICT_FALSE (gtpu_local_need_csum_check (b0))) + csum_err0 = !gtpu_validate_udp_csum (vm, b0); + else + csum_err0 = !gtpu_local_csum_is_valid (b0); + if (PREDICT_FALSE (gtpu_local_need_csum_check (b1))) + csum_err1 = !gtpu_validate_udp_csum (vm, b1); + else + csum_err1 = !gtpu_local_csum_is_valid (b1); + + if (ip_err0 || udp_err0 || csum_err0) + { + next0 = GTPU_INPUT_NEXT_DROP; + error0 = gtpu_err_code (ip_err0, udp_err0, csum_err0); + goto trace0; + } + + /* speculatively load gtp header version field */ + ver0 = gtpu0->ver_flags; + + /* + * Manipulate gtpu header + * TBD: Manipulate Sequence Number and N-PDU Number + * TBD: Manipulate Next Extension Header + */ + gtpu_hdr_len0 = sizeof(gtpu_header_t) - (((ver0 & GTPU_E_S_PN_BIT) == 0) * 4); + + has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0); + if (PREDICT_FALSE (((ver0 & GTPU_VER_MASK) != GTPU_V1_VER) | (!has_space0))) + { + error0 = has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL; + next0 = GTPU_INPUT_NEXT_DROP; + goto trace0; + } + + /* Manipulate packet 0 */ + ASSERT (b0->flow_id != 0); + tunnel_index0 = b0->flow_id - gtm->flow_id_start; + t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0); + b0->flow_id = 0; + + /* Pop gtpu header */ + vlib_buffer_advance (b0, gtpu_hdr_len0); + + next0 = GTPU_INPUT_NEXT_IP4_INPUT; + sw_if_index0 = t0->sw_if_index; + + /* Set packet input sw_if_index to unicast GTPU tunnel for learning */ + vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0; + + pkts_decapsulated ++; + stats_n_packets += 1; + stats_n_bytes += len0; + + /* Batch stats increment on the same gtpu tunnel so counter + is not incremented per packet */ + if (PREDICT_FALSE (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 = sw_if_index0; + } + +trace0: + b0->error = error0 ? node->errors[error0] : 0; + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + gtpu_rx_trace_t *tr + = vlib_add_trace (vm, node, b0, sizeof (*tr)); + tr->next_index = next0; + tr->error = error0; + tr->tunnel_index = tunnel_index0; + tr->teid = has_space0 ? clib_net_to_host_u32(gtpu0->teid) : ~0; + } + + if (ip_err1 || udp_err1 || csum_err1) + { + next1 = GTPU_INPUT_NEXT_DROP; + error1 = gtpu_err_code (ip_err1, udp_err1, csum_err1); + goto trace1; + } + + /* speculatively load gtp header version field */ + ver1 = gtpu1->ver_flags; + + /* + * Manipulate gtpu header + * TBD: Manipulate Sequence Number and N-PDU Number + * TBD: Manipulate Next Extension Header + */ + gtpu_hdr_len1 = sizeof(gtpu_header_t) - (((ver1 & GTPU_E_S_PN_BIT) == 0) * 4); + has_space1 = vlib_buffer_has_space (b1, gtpu_hdr_len1); + if (PREDICT_FALSE (((ver1 & GTPU_VER_MASK) != GTPU_V1_VER) | (!has_space1))) + { + error1 = has_space1 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL; + next1 = GTPU_INPUT_NEXT_DROP; + goto trace1; + } + + /* Manipulate packet 1 */ + ASSERT (b1->flow_id != 0); + tunnel_index1 = b1->flow_id - gtm->flow_id_start; + t1 = pool_elt_at_index (gtm->tunnels, tunnel_index1); + b1->flow_id = 0; + + /* Pop gtpu header */ + vlib_buffer_advance (b1, gtpu_hdr_len1); + + next1 = GTPU_INPUT_NEXT_IP4_INPUT; + sw_if_index1 = t1->sw_if_index; + + /* Required to make the l2 tag push / pop code work on l2 subifs */ + /* This won't happen in current implementation as only + ipv4/udp/gtpu/IPV4 type packets can be matched */ + if (PREDICT_FALSE(next1 == GTPU_INPUT_NEXT_L2_INPUT)) + vnet_update_l2_len (b1); + + /* Set packet input sw_if_index to unicast GTPU tunnel for learning */ + vnet_buffer(b1)->sw_if_index[VLIB_RX] = sw_if_index1; + + pkts_decapsulated ++; + stats_n_packets += 1; + stats_n_bytes += len1; + + /* Batch stats increment on the same gtpu tunnel so counter + is not incremented per packet */ + if (PREDICT_FALSE (sw_if_index1 != stats_sw_if_index)) + { + stats_n_packets -= 1; + stats_n_bytes -= len1; + 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 = len1; + stats_sw_if_index = sw_if_index1; + } + +trace1: + b1->error = error1 ? node->errors[error1] : 0; + + if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED)) + { + gtpu_rx_trace_t *tr + = vlib_add_trace (vm, node, b1, sizeof (*tr)); + tr->next_index = next1; + tr->error = error1; + tr->tunnel_index = tunnel_index1; + tr->teid = has_space1 ? clib_net_to_host_u32(gtpu1->teid) : ~0; + } + + vlib_validate_buffer_enqueue_x2 (vm, node, next_index, + to_next, n_left_to_next, + bi0, bi1, next0, next1); + } + + while (n_left_from > 0 && n_left_to_next > 0) + { + u32 bi0; + vlib_buffer_t * b0; + u32 next0; + gtpu_header_t * gtpu0; + u32 gtpu_hdr_len0; + u32 error0; + u32 tunnel_index0; + gtpu_tunnel_t * t0; + u32 sw_if_index0, len0; + u8 has_space0 = 0; + u8 ver0; + + 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); + len0 = vlib_buffer_length_in_chain (vm, b0); + + tunnel_index0 = ~0; + error0 = 0; + + ip_err0 = gtpu_check_ip (b0, len0); + udp_err0 = gtpu_check_ip_udp_len (b0); + if (PREDICT_FALSE (gtpu_local_need_csum_check (b0))) + csum_err0 = !gtpu_validate_udp_csum (vm, b0); + else + csum_err0 = !gtpu_local_csum_is_valid (b0); + + if (ip_err0 || udp_err0 || csum_err0) + { + next0 = GTPU_INPUT_NEXT_DROP; + error0 = gtpu_err_code (ip_err0, udp_err0, csum_err0); + goto trace00; + } + + /* udp leaves current_data pointing at the gtpu header */ + gtpu0 = vlib_buffer_get_current (b0); + + /* speculatively load gtp header version field */ + ver0 = gtpu0->ver_flags; + + /* + * Manipulate gtpu header + * TBD: Manipulate Sequence Number and N-PDU Number + * TBD: Manipulate Next Extension Header + */ + gtpu_hdr_len0 = sizeof(gtpu_header_t) - (((ver0 & GTPU_E_S_PN_BIT) == 0) * 4); + + has_space0 = vlib_buffer_has_space (b0, gtpu_hdr_len0); + if (PREDICT_FALSE (((ver0 & GTPU_VER_MASK) != GTPU_V1_VER) | (!has_space0))) + { + error0 = has_space0 ? GTPU_ERROR_BAD_VER : GTPU_ERROR_TOO_SMALL; + next0 = GTPU_INPUT_NEXT_DROP; + goto trace00; + } + + ASSERT (b0->flow_id != 0); + tunnel_index0 = b0->flow_id - gtm->flow_id_start; + t0 = pool_elt_at_index (gtm->tunnels, tunnel_index0); + b0->flow_id = 0; + + /* Pop gtpu header */ + vlib_buffer_advance (b0, gtpu_hdr_len0); + + next0 = GTPU_INPUT_NEXT_IP4_INPUT; + sw_if_index0 = t0->sw_if_index; + + /* Set packet input sw_if_index to unicast GTPU tunnel for learning */ + vnet_buffer(b0)->sw_if_index[VLIB_RX] = sw_if_index0; + + pkts_decapsulated ++; + stats_n_packets += 1; + stats_n_bytes += len0; + + /* Batch stats increment on the same gtpu tunnel so counter + is not incremented per packet */ + if (PREDICT_FALSE (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 = sw_if_index0; + } + trace00: + b0->error = error0 ? node->errors[error0] : 0; + + if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED)) + { + gtpu_rx_trace_t *tr + = vlib_add_trace (vm, node, b0, sizeof (*tr)); + tr->next_index = next0; + tr->error = error0; + tr->tunnel_index = tunnel_index0; + tr->teid = has_space0 ? clib_net_to_host_u32(gtpu0->teid) : ~0; + } + 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 tunnel tx stats is kept? */ + vlib_node_increment_counter (vm, gtpu4_flow_input_node.index, + GTPU_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_NODE_FN (gtpu4_flow_input_node) (vlib_main_t * vm, + vlib_node_runtime_t * node, + vlib_frame_t * from_frame) +{ + return gtpu_flow_input(vm, node, from_frame); +} + + +/* *INDENT-OFF* */ +#ifndef CLIB_MULTIARCH_VARIANT +VLIB_REGISTER_NODE (gtpu4_flow_input_node) = { + .name = "gtpu4-flow-input", + .type = VLIB_NODE_TYPE_INTERNAL, + .vector_size = sizeof (u32), + + .format_trace = format_gtpu_rx_trace, + + .n_errors = GTPU_FLOW_N_ERROR, + .error_strings = gtpu_flow_error_strings, + + .n_next_nodes = GTPU_INPUT_N_NEXT, + .next_nodes = { +#define _(s,n) [GTPU_INPUT_NEXT_##s] = n, + foreach_gtpu_input_next +#undef _ + + }, +}; +#endif +/* *INDENT-ON* */ + #endif /* CLIB_MARCH_VARIANT */ |