/* * node.c: udp packet processing * * Copyright (c) 2013-2019 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/pg/pg.h> #include <vnet/udp/udp.h> #include <vnet/udp/udp_packet.h> #include <vppinfra/sparse_vec.h> typedef enum { UDP_LOCAL_NEXT_PUNT, UDP_LOCAL_NEXT_DROP, UDP_LOCAL_NEXT_ICMP, UDP_LOCAL_N_NEXT } udp_local_next_t; typedef struct { u16 src_port; u16 dst_port; u8 bound; } udp_local_rx_trace_t; #define UDP_NO_NODE_SET ((u16) ~0) #ifndef CLIB_MARCH_VARIANT u8 * format_udp_rx_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 *); udp_local_rx_trace_t *t = va_arg (*args, udp_local_rx_trace_t *); s = format (s, "UDP: src-port %d dst-port %d%s", clib_net_to_host_u16 (t->src_port), clib_net_to_host_u16 (t->dst_port), t->bound ? "" : " (no listener)"); return s; } #endif /* CLIB_MARCH_VARIANT */ always_inline uword udp46_local_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, int is_ip4) { udp_main_t *um = &udp_main; __attribute__ ((unused)) u32 n_left_from, next_index, *from, *to_next; u8 punt_unknown = is_ip4 ? um->punt_unknown4 : um->punt_unknown6; u16 *next_by_dst_port = (is_ip4 ? um->next_by_dst_port4 : um->next_by_dst_port6); from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; next_index = node->cached_next_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 >= 4 && n_left_to_next >= 2) { u32 bi0, bi1; vlib_buffer_t *b0, *b1; udp_header_t *h0 = 0, *h1 = 0; u32 i0, i1, dst_port0, dst_port1; u32 advance0, advance1; u32 error0, next0, error1, next1; /* 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, sizeof (h0[0]), LOAD); CLIB_PREFETCH (p3->data, sizeof (h1[0]), 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); /* ip4/6_local hands us the ip header, not the udp header */ if (is_ip4) { advance0 = ip4_header_bytes (vlib_buffer_get_current (b0)); advance1 = ip4_header_bytes (vlib_buffer_get_current (b1)); } else { advance0 = sizeof (ip6_header_t); advance1 = sizeof (ip6_header_t); } if (PREDICT_FALSE (b0->current_length < advance0 + sizeof (*h0))) { error0 = UDP_ERROR_LENGTH_ERROR; next0 = UDP_LOCAL_NEXT_DROP; } else { vlib_buffer_advance (b0, advance0); h0 = vlib_buffer_get_current (b0); error0 = UDP_ERROR_NONE; next0 = UDP_LOCAL_NEXT_PUNT; if (PREDICT_FALSE (clib_net_to_host_u16 (h0->length) > vlib_buffer_length_in_chain (vm, b0))) { error0 = UDP_ERROR_LENGTH_ERROR; next0 = UDP_LOCAL_NEXT_DROP; } } if (PREDICT_FALSE (b1->current_length < advance1 + sizeof (*h1))) { error1 = UDP_ERROR_LENGTH_ERROR; next1 = UDP_LOCAL_NEXT_DROP; } else { vlib_buffer_advance (b1, advance1); h1 = vlib_buffer_get_current (b1); error1 = UDP_ERROR_NONE; next1 = UDP_LOCAL_NEXT_PUNT; if (PREDICT_FALSE (clib_net_to_host_u16 (h1->length) > vlib_buffer_length_in_chain (vm, b1))) { error1 = UDP_ERROR_LENGTH_ERROR; next1 = UDP_LOCAL_NEXT_DROP; } } /* Index sparse array with network byte order. */ dst_port0 = (error0 == 0) ? h0->dst_port : 0; dst_port1 = (error1 == 0) ? h1->dst_port : 0; sparse_vec_index2 (next_by_dst_port, dst_port0, dst_port1, &i0, &i1); next0 = (error0 == 0) ? vec_elt (next_by_dst_port, i0) : next0; next1 = (error1 == 0) ? vec_elt (next_by_dst_port, i1) : next1; if (PREDICT_FALSE (i0 == SPARSE_VEC_INVALID_INDEX || next0 == UDP_NO_NODE_SET)) { // move the pointer back so icmp-error can find the // ip packet header vlib_buffer_advance (b0, -(word) advance0); if (PREDICT_FALSE (punt_unknown)) { b0->error = node->errors[UDP_ERROR_PUNT]; next0 = UDP_LOCAL_NEXT_PUNT; } else if (is_ip4) { icmp4_error_set_vnet_buffer (b0, ICMP4_destination_unreachable, ICMP4_destination_unreachable_port_unreachable, 0); b0->error = node->errors[UDP_ERROR_NO_LISTENER]; next0 = UDP_LOCAL_NEXT_ICMP; } else { icmp6_error_set_vnet_buffer (b0, ICMP6_destination_unreachable, ICMP6_destination_unreachable_port_unreachable, 0); b0->error = node->errors[UDP_ERROR_NO_LISTENER]; next0 = UDP_LOCAL_NEXT_ICMP; } } else { b0->error = node->errors[UDP_ERROR_NONE]; // advance to the payload vlib_buffer_advance (b0, sizeof (*h0)); } if (PREDICT_FALSE (i1 == SPARSE_VEC_INVALID_INDEX || next1 == UDP_NO_NODE_SET)) { // move the pointer back so icmp-error can find the // ip packet header vlib_buffer_advance (b1, -(word) advance1); if (PREDICT_FALSE (punt_unknown)) { b1->error = node->errors[UDP_ERROR_PUNT]; next1 = UDP_LOCAL_NEXT_PUNT; } else if (is_ip4) { icmp4_error_set_vnet_buffer (b1, ICMP4_destination_unreachable, ICMP4_destination_unreachable_port_unreachable, 0); b1->error = node->errors[UDP_ERROR_NO_LISTENER]; next1 = UDP_LOCAL_NEXT_ICMP; } else { icmp6_error_set_vnet_buffer (b1, ICMP6_destination_unreachable, ICMP6_destination_unreachable_port_unreachable, 0); b1->error = node->errors[UDP_ERROR_NO_LISTENER]; next1 = UDP_LOCAL_NEXT_ICMP; } } else { b1->error = node->errors[UDP_ERROR_NONE]; // advance to the payload vlib_buffer_advance (b1, sizeof (*h1)); } if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { udp_local_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); if (b0->error != node->errors[UDP_ERROR_LENGTH_ERROR]) { tr->src_port = h0 ? h0->src_port : 0; tr->dst_port = h0 ? h0->dst_port : 0; tr->bound = (next0 != UDP_LOCAL_NEXT_ICMP); } } if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED)) { udp_local_rx_trace_t *tr = vlib_add_trace (vm, node, b1, sizeof (*tr)); if (b1->error != node->errors[UDP_ERROR_LENGTH_ERROR]) { tr->src_port = h1 ? h1->src_port : 0; tr->dst_port = h1 ? h1->dst_port : 0; tr->bound = (next1 != UDP_LOCAL_NEXT_ICMP); } } 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; udp_header_t *h0 = 0; u32 i0, next0; u32 advance0; 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); /* ip4/6_local hands us the ip header, not the udp header */ if (is_ip4) advance0 = ip4_header_bytes (vlib_buffer_get_current (b0)); else advance0 = sizeof (ip6_header_t); if (PREDICT_FALSE (b0->current_length < advance0 + sizeof (*h0))) { b0->error = node->errors[UDP_ERROR_LENGTH_ERROR]; next0 = UDP_LOCAL_NEXT_DROP; goto trace_x1; } vlib_buffer_advance (b0, advance0); h0 = vlib_buffer_get_current (b0); if (PREDICT_TRUE (clib_net_to_host_u16 (h0->length) <= vlib_buffer_length_in_chain (vm, b0))) { i0 = sparse_vec_index (next_by_dst_port, h0->dst_port); next0 = vec_elt (next_by_dst_port, i0); if (PREDICT_FALSE ((i0 == SPARSE_VEC_INVALID_INDEX) || next0 == UDP_NO_NODE_SET)) { // move the pointer back so icmp-error can find the // ip packet header vlib_buffer_advance (b0, -(word) advance0); if (PREDICT_FALSE (punt_unknown)) { b0->error = node->errors[UDP_ERROR_PUNT]; next0 = UDP_LOCAL_NEXT_PUNT; } else if (is_ip4) { icmp4_error_set_vnet_buffer (b0, ICMP4_destination_unreachable, ICMP4_destination_unreachable_port_unreachable, 0); b0->error = node->errors[UDP_ERROR_NO_LISTENER]; next0 = UDP_LOCAL_NEXT_ICMP; } else { icmp6_error_set_vnet_buffer (b0, ICMP6_destination_unreachable, ICMP6_destination_unreachable_port_unreachable, 0); b0->error = node->errors[UDP_ERROR_NO_LISTENER]; next0 = UDP_LOCAL_NEXT_ICMP; } } else { b0->error = node->errors[UDP_ERROR_NONE]; // advance to the payload vlib_buffer_advance (b0, sizeof (*h0)); } } else { b0->error = node->errors[UDP_ERROR_LENGTH_ERROR]; next0 = UDP_LOCAL_NEXT_DROP; } trace_x1: if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED)) { udp_local_rx_trace_t *tr = vlib_add_trace (vm, node, b0, sizeof (*tr)); if (b0->error != node->errors[UDP_ERROR_LENGTH_ERROR]) { tr->src_port = h0->src_port; tr->dst_port = h0->dst_port; tr->bound = (next0 != UDP_LOCAL_NEXT_ICMP); } } 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; } static char *udp_error_strings[] = { #define udp_error(n,s) s, #include "udp_error.def" #undef udp_error }; VLIB_NODE_FN (udp4_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { return udp46_local_inline (vm, node, from_frame, 1 /* is_ip4 */ ); } VLIB_NODE_FN (udp6_local_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame) { return udp46_local_inline (vm, node, from_frame, 0 /* is_ip4 */ ); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (udp4_local_node) = { .name = "ip4-udp-lookup", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = UDP_N_ERROR, .error_strings = udp_error_strings, .n_next_nodes = UDP_LOCAL_N_NEXT, .next_nodes = { [UDP_LOCAL_NEXT_PUNT]= "ip4-punt", [UDP_LOCAL_NEXT_DROP]= "ip4-drop", [UDP_LOCAL_NEXT_ICMP]= "ip4-icmp-error", }, .format_buffer = format_udp_header, .format_trace = format_udp_rx_trace, .unformat_buffer = unformat_udp_header, }; /* *INDENT-ON* */ /* *INDENT-OFF* */ VLIB_REGISTER_NODE (udp6_local_node) = { .name = "ip6-udp-lookup", /* Takes a vector of packets. */ .vector_size = sizeof (u32), .n_errors = UDP_N_ERROR, .error_strings = udp_error_strings, .n_next_nodes = UDP_LOCAL_N_NEXT, .next_nodes = { [UDP_LOCAL_NEXT_PUNT]= "ip6-punt", [UDP_LOCAL_NEXT_DROP]= "ip6-drop", [UDP_LOCAL_NEXT_ICMP]= "ip6-icmp-error", }, .format_buffer = format_udp_header, .format_trace = format_udp_rx_trace, .unformat_buffer = unformat_udp_header, }; /* *INDENT-ON* */ #ifndef CLIB_MARCH_VARIANT void udp_add_dst_port (udp_main_t * um, udp_dst_port_t dst_port, char *dst_port_name, u8 is_ip4) { udp_dst_port_info_t *pi; u32 i; vec_add2 (um->dst_port_infos[is_ip4], pi, 1); i = pi - um->dst_port_infos[is_ip4]; pi->name = dst_port_name; pi->dst_port = dst_port; pi->next_index = pi->node_index = ~0; hash_set (um->dst_port_info_by_dst_port[is_ip4], dst_port, i); if (pi->name) hash_set_mem (um->dst_port_info_by_name[is_ip4], pi->name, i); } void udp_register_dst_port (vlib_main_t * vm, udp_dst_port_t dst_port, u32 node_index, u8 is_ip4) { udp_main_t *um = &udp_main; udp_dst_port_info_t *pi; u16 *n; { clib_error_t *error = vlib_call_init_function (vm, udp_local_init); if (error) clib_error_report (error); } pi = udp_get_dst_port_info (um, dst_port, is_ip4); if (!pi) { udp_add_dst_port (um, dst_port, 0, is_ip4); pi = udp_get_dst_port_info (um, dst_port, is_ip4); ASSERT (pi); } pi->node_index = node_index; pi->next_index = vlib_node_add_next (vm, is_ip4 ? udp4_local_node.index : udp6_local_node.index, node_index); /* Setup udp protocol -> next index sparse vector mapping. */ if (is_ip4) n = sparse_vec_validate (um->next_by_dst_port4, clib_host_to_net_u16 (dst_port)); else n = sparse_vec_validate (um->next_by_dst_port6, clib_host_to_net_u16 (dst_port)); n[0] = pi->next_index; } void udp_unregister_dst_port (vlib_main_t * vm, udp_dst_port_t dst_port, u8 is_ip4) { udp_main_t *um = &udp_main; udp_dst_port_info_t *pi; u16 *n; pi = udp_get_dst_port_info (um, dst_port, is_ip4); /* Not registered? Fagedaboudit */ if (!pi) return; /* Kill the mapping. Don't bother killing the pi, it may be back. */ if (is_ip4) n = sparse_vec_validate (um->next_by_dst_port4, clib_host_to_net_u16 (dst_port)); else n = sparse_vec_validate (um->next_by_dst_port6, clib_host_to_net_u16 (dst_port)); n[0] = UDP_NO_NODE_SET; } u8 udp_is_valid_dst_port (udp_dst_port_t dst_port, u8 is_ip4) { udp_main_t *um = &udp_main; u16 *n; if (is_ip4) n = sparse_vec_validate (um->next_by_dst_port4, clib_host_to_net_u16 (dst_port)); else n = sparse_vec_validate (um->next_by_dst_port6, clib_host_to_net_u16 (dst_port)); return (n[0] != SPARSE_VEC_INVALID_INDEX && n[0] != UDP_NO_NODE_SET); } void udp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add) { udp_main_t *um = &udp_main; { clib_error_t *error = vlib_call_init_function (vm, udp_local_init); if (error) clib_error_report (error); } if (is_ip4) um->punt_unknown4 = is_add; else um->punt_unknown6 = is_add; } /* Parse a UDP header. */ uword unformat_udp_header (unformat_input_t * input, va_list * args) { u8 **result = va_arg (*args, u8 **); udp_header_t *udp; __attribute__ ((unused)) int old_length; u16 src_port, dst_port; /* Allocate space for IP header. */ { void *p; old_length = vec_len (*result); vec_add2 (*result, p, sizeof (ip4_header_t)); udp = p; } clib_memset (udp, 0, sizeof (udp[0])); if (unformat (input, "src-port %d dst-port %d", &src_port, &dst_port)) { udp->src_port = clib_host_to_net_u16 (src_port); udp->dst_port = clib_host_to_net_u16 (dst_port); return 1; } return 0; } static void udp_setup_node (vlib_main_t * vm, u32 node_index) { vlib_node_t *n = vlib_get_node (vm, node_index); pg_node_t *pn = pg_get_node (node_index); n->format_buffer = format_udp_header; n->unformat_buffer = unformat_udp_header; pn->unformat_edit = unformat_pg_udp_header; } clib_error_t * udp_local_init (vlib_main_t * vm) { udp_main_t *um = &udp_main; int i; { clib_error_t *error; error = vlib_call_init_function (vm, udp_init); if (error) clib_error_report (error); } for (i = 0; i < 2; i++) { um->dst_port_info_by_name[i] = hash_create_string (0, sizeof (uword)); um->dst_port_info_by_dst_port[i] = hash_create (0, sizeof (uword)); } udp_setup_node (vm, udp4_local_node.index); udp_setup_node (vm, udp6_local_node.index); um->punt_unknown4 = 0; um->punt_unknown6 = 0; um->next_by_dst_port4 = sparse_vec_new ( /* elt bytes */ sizeof (um->next_by_dst_port4[0]), /* bits in index */ BITS (((udp_header_t *) 0)->dst_port)); um->next_by_dst_port6 = sparse_vec_new ( /* elt bytes */ sizeof (um->next_by_dst_port6[0]), /* bits in index */ BITS (((udp_header_t *) 0)->dst_port)); #define _(n,s) udp_add_dst_port (um, UDP_DST_PORT_##s, #s, 1 /* is_ip4 */); foreach_udp4_dst_port #undef _ #define _(n,s) udp_add_dst_port (um, UDP_DST_PORT_##s, #s, 0 /* is_ip4 */); foreach_udp6_dst_port #undef _ ip4_register_protocol (IP_PROTOCOL_UDP, udp4_local_node.index); /* Note: ip6 differs from ip4, UDP is hotwired to ip6-udp-lookup */ return 0; } VLIB_INIT_FUNCTION (udp_local_init); #endif /* CLIB_MARCH_VARIANT */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */