--- /dev/null
+/*
+ * node.c: udp packet processing
+ *
+ * Copyright (c) 2013 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>
+
+udp_main_t udp_main;
+
+#define foreach_udp_input_next \
+ _ (PUNT, "error-punt") \
+ _ (DROP, "error-drop") \
+ _ (ICMP4_ERROR, "ip4-icmp-error") \
+ _ (ICMP6_ERROR, "ip6-icmp-error")
+
+typedef enum
+{
+#define _(s,n) UDP_INPUT_NEXT_##s,
+ foreach_udp_input_next
+#undef _
+ UDP_INPUT_N_NEXT,
+} udp_input_next_t;
+
+typedef struct
+{
+ u16 src_port;
+ u16 dst_port;
+ u8 bound;
+} udp_rx_trace_t;
+
+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_rx_trace_t *t = va_arg (*args, udp_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;
+}
+
+typedef struct
+{
+ /* Sparse vector mapping udp dst_port in network byte order
+ to next index. */
+ u16 *next_by_dst_port;
+ u8 punt_unknown;
+} udp_input_runtime_t;
+
+vlib_node_registration_t udp4_input_node;
+vlib_node_registration_t udp6_input_node;
+
+always_inline uword
+udp46_input_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame, int is_ip4)
+{
+ udp_input_runtime_t *rt = is_ip4 ?
+ (void *) vlib_node_get_runtime_data (vm, udp4_input_node.index)
+ : (void *) vlib_node_get_runtime_data (vm, udp6_input_node.index);
+ __attribute__ ((unused)) u32 n_left_from, next_index, *from, *to_next;
+ word n_no_listener = 0;
+ u8 punt_unknown = rt->punt_unknown;
+
+ 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 = sizeof (ip4_header_t);
+ advance1 = sizeof (ip4_header_t);
+ }
+ 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_INPUT_NEXT_DROP;
+ }
+ else
+ {
+ vlib_buffer_advance (b0, advance0);
+ h0 = vlib_buffer_get_current (b0);
+ error0 = next0 = 0;
+ if (PREDICT_FALSE (clib_net_to_host_u16 (h0->length) >
+ vlib_buffer_length_in_chain (vm, b0)))
+ {
+ error0 = UDP_ERROR_LENGTH_ERROR;
+ next0 = UDP_INPUT_NEXT_DROP;
+ }
+ }
+
+ if (PREDICT_FALSE (b1->current_length < advance1 + sizeof (*h1)))
+ {
+ error1 = UDP_ERROR_LENGTH_ERROR;
+ next1 = UDP_INPUT_NEXT_DROP;
+ }
+ else
+ {
+ vlib_buffer_advance (b1, advance1);
+ h1 = vlib_buffer_get_current (b1);
+ error1 = next1 = 0;
+ if (PREDICT_FALSE (clib_net_to_host_u16 (h1->length) >
+ vlib_buffer_length_in_chain (vm, b1)))
+ {
+ error1 = UDP_ERROR_LENGTH_ERROR;
+ next1 = UDP_INPUT_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 (rt->next_by_dst_port, dst_port0, dst_port1,
+ &i0, &i1);
+ next0 = (error0 == 0) ? vec_elt (rt->next_by_dst_port, i0) : next0;
+ next1 = (error1 == 0) ? vec_elt (rt->next_by_dst_port, i1) : next1;
+
+ if (PREDICT_FALSE (i0 == SPARSE_VEC_INVALID_INDEX))
+ {
+ // 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_INPUT_NEXT_PUNT;
+ }
+ else if (is_ip4)
+ {
+ icmp4_error_set_vnet_buffer (b0,
+ ICMP4_destination_unreachable,
+ ICMP4_destination_unreachable_port_unreachable,
+ 0);
+ next0 = UDP_INPUT_NEXT_ICMP4_ERROR;
+ n_no_listener++;
+ }
+ else
+ {
+ icmp6_error_set_vnet_buffer (b0,
+ ICMP6_destination_unreachable,
+ ICMP6_destination_unreachable_port_unreachable,
+ 0);
+ next0 = UDP_INPUT_NEXT_ICMP6_ERROR;
+ n_no_listener++;
+ }
+ }
+ 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))
+ {
+ // 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_INPUT_NEXT_PUNT;
+ }
+ else if (is_ip4)
+ {
+ icmp4_error_set_vnet_buffer (b1,
+ ICMP4_destination_unreachable,
+ ICMP4_destination_unreachable_port_unreachable,
+ 0);
+ next1 = UDP_INPUT_NEXT_ICMP4_ERROR;
+ n_no_listener++;
+ }
+ else
+ {
+ icmp6_error_set_vnet_buffer (b1,
+ ICMP6_destination_unreachable,
+ ICMP6_destination_unreachable_port_unreachable,
+ 0);
+ next1 = UDP_INPUT_NEXT_ICMP6_ERROR;
+ n_no_listener++;
+ }
+ }
+ 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_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_INPUT_NEXT_ICMP4_ERROR &&
+ next0 != UDP_INPUT_NEXT_ICMP6_ERROR);
+ }
+ }
+ if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ udp_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_INPUT_NEXT_ICMP4_ERROR &&
+ next1 != UDP_INPUT_NEXT_ICMP6_ERROR);
+ }
+ }
+
+ 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 = sizeof (ip4_header_t);
+ 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_INPUT_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 (rt->next_by_dst_port, h0->dst_port);
+ next0 = vec_elt (rt->next_by_dst_port, i0);
+
+ if (PREDICT_FALSE (i0 == SPARSE_VEC_INVALID_INDEX))
+ {
+ // 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_INPUT_NEXT_PUNT;
+ }
+ else if (is_ip4)
+ {
+ icmp4_error_set_vnet_buffer (b0,
+ ICMP4_destination_unreachable,
+ ICMP4_destination_unreachable_port_unreachable,
+ 0);
+ next0 = UDP_INPUT_NEXT_ICMP4_ERROR;
+ n_no_listener++;
+ }
+ else
+ {
+ icmp6_error_set_vnet_buffer (b0,
+ ICMP6_destination_unreachable,
+ ICMP6_destination_unreachable_port_unreachable,
+ 0);
+ next0 = UDP_INPUT_NEXT_ICMP6_ERROR;
+ n_no_listener++;
+ }
+ }
+ 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_INPUT_NEXT_DROP;
+ }
+
+ trace_x1:
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ udp_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_INPUT_NEXT_ICMP4_ERROR &&
+ next0 != UDP_INPUT_NEXT_ICMP6_ERROR);
+ }
+ }
+
+ 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);
+ }
+ vlib_error_count (vm, node->node_index, UDP_ERROR_NO_LISTENER,
+ n_no_listener);
+ return from_frame->n_vectors;
+}
+
+static char *udp_error_strings[] = {
+#define udp_error(n,s) s,
+#include "udp_error.def"
+#undef udp_error
+};
+
+static uword
+udp4_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * from_frame)
+{
+ return udp46_input_inline (vm, node, from_frame, 1 /* is_ip4 */ );
+}
+
+static uword
+udp6_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * from_frame)
+{
+ return udp46_input_inline (vm, node, from_frame, 0 /* is_ip4 */ );
+}
+
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (udp4_input_node) = {
+ .function = udp4_input,
+ .name = "ip4-udp-lookup",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+
+ .runtime_data_bytes = sizeof (udp_input_runtime_t),
+
+ .n_errors = UDP_N_ERROR,
+ .error_strings = udp_error_strings,
+
+ .n_next_nodes = UDP_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [UDP_INPUT_NEXT_##s] = n,
+ foreach_udp_input_next
+#undef _
+ },
+
+ .format_buffer = format_udp_header,
+ .format_trace = format_udp_rx_trace,
+ .unformat_buffer = unformat_udp_header,
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (udp4_input_node, udp4_input);
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (udp6_input_node) = {
+ .function = udp6_input,
+ .name = "ip6-udp-lookup",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+
+ .runtime_data_bytes = sizeof (udp_input_runtime_t),
+
+ .n_errors = UDP_N_ERROR,
+ .error_strings = udp_error_strings,
+
+ .n_next_nodes = UDP_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [UDP_INPUT_NEXT_##s] = n,
+ foreach_udp_input_next
+#undef _
+ },
+
+ .format_buffer = format_udp_header,
+ .format_trace = format_udp_rx_trace,
+ .unformat_buffer = unformat_udp_header,
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (udp6_input_node, udp6_input);
+
+static void
+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;
+ udp_input_runtime_t *rt;
+ 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)
+ {
+ 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_input_node.index
+ : udp6_input_node.index, node_index);
+
+ /* Setup udp protocol -> next index sparse vector mapping. */
+ rt = vlib_node_get_runtime_data
+ (vm, is_ip4 ? udp4_input_node.index : udp6_input_node.index);
+ n = sparse_vec_validate (rt->next_by_dst_port,
+ 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;
+ udp_input_runtime_t *rt;
+ 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. */
+ rt = vlib_node_get_runtime_data
+ (vm, is_ip4 ? udp4_input_node.index : udp6_input_node.index);
+ n = sparse_vec_validate (rt->next_by_dst_port,
+ clib_host_to_net_u16 (dst_port));
+ n[0] = SPARSE_VEC_INVALID_INDEX;
+}
+
+void
+udp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add)
+{
+ udp_input_runtime_t *rt;
+
+ {
+ clib_error_t *error = vlib_call_init_function (vm, udp_local_init);
+ if (error)
+ clib_error_report (error);
+ }
+
+ rt = vlib_node_get_runtime_data
+ (vm, is_ip4 ? udp4_input_node.index : udp6_input_node.index);
+
+ rt->punt_unknown = 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;
+ }
+
+ 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_input_runtime_t *rt;
+ 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_input_node.index);
+ udp_setup_node (vm, udp6_input_node.index);
+
+ rt = vlib_node_get_runtime_data (vm, udp4_input_node.index);
+
+ rt->next_by_dst_port = sparse_vec_new
+ ( /* elt bytes */ sizeof (rt->next_by_dst_port[0]),
+ /* bits in index */ BITS (((udp_header_t *) 0)->dst_port));
+
+ rt->punt_unknown = 0;
+
+#define _(n,s) add_dst_port (um, UDP_DST_PORT_##s, #s, 1 /* is_ip4 */);
+ foreach_udp4_dst_port
+#undef _
+ rt = vlib_node_get_runtime_data (vm, udp6_input_node.index);
+
+ rt->next_by_dst_port = sparse_vec_new
+ ( /* elt bytes */ sizeof (rt->next_by_dst_port[0]),
+ /* bits in index */ BITS (((udp_header_t *) 0)->dst_port));
+
+ rt->punt_unknown = 0;
+
+#define _(n,s) add_dst_port (um, UDP_DST_PORT_##s, #s, 0 /* is_ip4 */);
+ foreach_udp6_dst_port
+#undef _
+ ip4_register_protocol (IP_PROTOCOL_UDP, udp4_input_node.index);
+ /* Note: ip6 differs from ip4, UDP is hotwired to ip6-udp-lookup */
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (udp_local_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
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