+++ /dev/null
-/*
- * Copyright (c) 2015 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.
- */
-/*
- * ip/udp_pg: UDP packet-generator interface
- *
- * Copyright (c) 2008 Eliot Dresselhaus
- *
- * Permission is hereby granted, free of charge, to any person obtaining
- * a copy of this software and associated documentation files (the
- * "Software"), to deal in the Software without restriction, including
- * without limitation the rights to use, copy, modify, merge, publish,
- * distribute, sublicense, and/or sell copies of the Software, and to
- * permit persons to whom the Software is furnished to do so, subject to
- * the following conditions:
- *
- * The above copyright notice and this permission notice shall be
- * included in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
- * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
- * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
- * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
- * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-#include <vnet/pg/pg.h>
-#include <vnet/ip/ip.h> /* for unformat_udp_udp_port */
-
-#define UDP_PG_EDIT_LENGTH (1 << 0)
-#define UDP_PG_EDIT_CHECKSUM (1 << 1)
-
-always_inline void
-udp_pg_edit_function_inline (pg_main_t * pg,
- pg_stream_t * s,
- pg_edit_group_t * g,
- u32 * packets, u32 n_packets, u32 flags)
-{
- vlib_main_t *vm = vlib_get_main ();
- u32 ip_offset, udp_offset;
-
- udp_offset = g->start_byte_offset;
- ip_offset = (g - 1)->start_byte_offset;
-
- while (n_packets >= 1)
- {
- vlib_buffer_t *p0;
- ip4_header_t *ip0;
- udp_header_t *udp0;
- u32 udp_len0;
-
- p0 = vlib_get_buffer (vm, packets[0]);
- n_packets -= 1;
- packets += 1;
-
- ip0 = (void *) (p0->data + ip_offset);
- udp0 = (void *) (p0->data + udp_offset);
- udp_len0 = clib_net_to_host_u16 (ip0->length) - sizeof (ip0[0]);
-
- if (flags & UDP_PG_EDIT_LENGTH)
- udp0->length =
- clib_net_to_host_u16 (vlib_buffer_length_in_chain (vm, p0)
- - ip_offset);
-
- /* Initialize checksum with header. */
- if (flags & UDP_PG_EDIT_CHECKSUM)
- {
- ip_csum_t sum0;
-
- sum0 = clib_mem_unaligned (&ip0->src_address, u64);
-
- sum0 = ip_csum_with_carry
- (sum0, clib_host_to_net_u32 (udp_len0 + (ip0->protocol << 16)));
-
- /* Invalidate possibly old checksum. */
- udp0->checksum = 0;
-
- sum0 =
- ip_incremental_checksum_buffer (vm, p0, udp_offset, udp_len0,
- sum0);
-
- sum0 = ~ip_csum_fold (sum0);
-
- /* Zero checksum means checksumming disabled. */
- sum0 = sum0 != 0 ? sum0 : 0xffff;
-
- udp0->checksum = sum0;
- }
- }
-}
-
-static void
-udp_pg_edit_function (pg_main_t * pg,
- pg_stream_t * s,
- pg_edit_group_t * g, u32 * packets, u32 n_packets)
-{
- switch (g->edit_function_opaque)
- {
- case UDP_PG_EDIT_LENGTH:
- udp_pg_edit_function_inline (pg, s, g, packets, n_packets,
- UDP_PG_EDIT_LENGTH);
- break;
-
- case UDP_PG_EDIT_CHECKSUM:
- udp_pg_edit_function_inline (pg, s, g, packets, n_packets,
- UDP_PG_EDIT_CHECKSUM);
- break;
-
- case UDP_PG_EDIT_CHECKSUM | UDP_PG_EDIT_LENGTH:
- udp_pg_edit_function_inline (pg, s, g, packets, n_packets,
- UDP_PG_EDIT_CHECKSUM | UDP_PG_EDIT_LENGTH);
- break;
-
- default:
- ASSERT (0);
- break;
- }
-}
-
-typedef struct
-{
- pg_edit_t src_port, dst_port;
- pg_edit_t length;
- pg_edit_t checksum;
-} pg_udp_header_t;
-
-static inline void
-pg_udp_header_init (pg_udp_header_t * p)
-{
- /* Initialize fields that are not bit fields in the IP header. */
-#define _(f) pg_edit_init (&p->f, udp_header_t, f);
- _(src_port);
- _(dst_port);
- _(length);
- _(checksum);
-#undef _
-}
-
-uword
-unformat_pg_udp_header (unformat_input_t * input, va_list * args)
-{
- pg_stream_t *s = va_arg (*args, pg_stream_t *);
- pg_udp_header_t *p;
- u32 group_index;
-
- p = pg_create_edit_group (s, sizeof (p[0]), sizeof (udp_header_t),
- &group_index);
- pg_udp_header_init (p);
-
- /* Defaults. */
- p->checksum.type = PG_EDIT_UNSPECIFIED;
- p->length.type = PG_EDIT_UNSPECIFIED;
-
- if (!unformat (input, "UDP: %U -> %U",
- unformat_pg_edit,
- unformat_tcp_udp_port, &p->src_port,
- unformat_pg_edit, unformat_tcp_udp_port, &p->dst_port))
- goto error;
-
- /* Parse options. */
- while (1)
- {
- if (unformat (input, "length %U",
- unformat_pg_edit, unformat_pg_number, &p->length))
- ;
-
- else if (unformat (input, "checksum %U",
- unformat_pg_edit, unformat_pg_number, &p->checksum))
- ;
-
- /* Can't parse input: try next protocol level. */
- else
- break;
- }
-
- {
- ip_main_t *im = &ip_main;
- u16 dst_port;
- tcp_udp_port_info_t *pi;
-
- pi = 0;
- if (p->dst_port.type == PG_EDIT_FIXED)
- {
- dst_port = pg_edit_get_value (&p->dst_port, PG_EDIT_LO);
- pi = ip_get_tcp_udp_port_info (im, dst_port);
- }
-
- if (pi && pi->unformat_pg_edit
- && unformat_user (input, pi->unformat_pg_edit, s))
- ;
-
- else if (!unformat_user (input, unformat_pg_payload, s))
- goto error;
-
- p = pg_get_edit_group (s, group_index);
- if (p->checksum.type == PG_EDIT_UNSPECIFIED
- || p->length.type == PG_EDIT_UNSPECIFIED)
- {
- pg_edit_group_t *g = pg_stream_get_group (s, group_index);
- g->edit_function = udp_pg_edit_function;
- g->edit_function_opaque = 0;
- if (p->checksum.type == PG_EDIT_UNSPECIFIED)
- g->edit_function_opaque |= UDP_PG_EDIT_CHECKSUM;
- if (p->length.type == PG_EDIT_UNSPECIFIED)
- g->edit_function_opaque |= UDP_PG_EDIT_LENGTH;
- }
-
- return 1;
- }
-
-error:
- /* Free up any edits we may have added. */
- pg_free_edit_group (s);
- return 0;
-}
-
-
-/*
- * fd.io coding-style-patch-verification: ON
- *
- * Local Variables:
- * eval: (c-set-style "gnu")
- * End:
- */
Code Review / vpp.git / blobdiff