2 * Copyright (c) 2015 Cisco and/or its affiliates.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at:
7 * http://www.apache.org/licenses/LICENSE-2.0
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
16 * ip/tcp_pg: TCP packet-generator interface
18 * Copyright (c) 2008 Eliot Dresselhaus
20 * Permission is hereby granted, free of charge, to any person obtaining
21 * a copy of this software and associated documentation files (the
22 * "Software"), to deal in the Software without restriction, including
23 * without limitation the rights to use, copy, modify, merge, publish,
24 * distribute, sublicense, and/or sell copies of the Software, and to
25 * permit persons to whom the Software is furnished to do so, subject to
26 * the following conditions:
28 * The above copyright notice and this permission notice shall be
29 * included in all copies or substantial portions of the Software.
31 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
32 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
33 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
34 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
35 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
36 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
37 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
40 #include <vnet/ip/ip.h>
41 #include <vnet/pg/pg.h>
44 tcp_pg_edit_function (pg_main_t * pg,
50 vlib_main_t * vm = pg->vlib_main;
51 u32 ip_offset, tcp_offset;
53 tcp_offset = g->start_byte_offset;
54 ip_offset = (g-1)->start_byte_offset;
56 while (n_packets >= 1)
64 p0 = vlib_get_buffer (vm, packets[0]);
68 ASSERT (p0->current_data == 0);
69 ip0 = (void *) (p0->data + ip_offset);
70 tcp0 = (void *) (p0->data + tcp_offset);
71 tcp_len0 = clib_net_to_host_u16 (ip0->length) - sizeof (ip0[0]);
73 /* Initialize checksum with header. */
74 if (BITS (sum0) == 32)
76 sum0 = clib_mem_unaligned (&ip0->src_address, u32);
77 sum0 = ip_csum_with_carry (sum0, clib_mem_unaligned (&ip0->dst_address, u32));
80 sum0 = clib_mem_unaligned (&ip0->src_address, u64);
82 sum0 = ip_csum_with_carry
83 (sum0, clib_host_to_net_u32 (tcp_len0 + (ip0->protocol << 16)));
85 /* Invalidate possibly old checksum. */
88 sum0 = ip_incremental_checksum_buffer (vm, p0, tcp_offset, tcp_len0, sum0);
90 tcp0->checksum = ~ ip_csum_fold (sum0);
95 struct { pg_edit_t src, dst; } ports;
96 pg_edit_t seq_number, ack_number;
97 pg_edit_t tcp_header_u32s;
98 #define _(f) pg_edit_t f##_flag;
103 pg_edit_t urgent_pointer;
107 pg_tcp_header_init (pg_tcp_header_t * p)
109 /* Initialize fields that are not bit fields in the IP header. */
110 #define _(f) pg_edit_init (&p->f, tcp_header_t, f);
120 /* Initialize bit fields. */
122 pg_edit_init_bitfield (&p->f##_flag, tcp_header_t, \
124 TCP_FLAG_BIT_##f, 1);
129 pg_edit_init_bitfield (&p->tcp_header_u32s, tcp_header_t,
130 tcp_header_u32s_and_reserved,
135 unformat_pg_tcp_header (unformat_input_t * input, va_list * args)
137 pg_stream_t * s = va_arg (*args, pg_stream_t *);
141 p = pg_create_edit_group (s, sizeof (p[0]), sizeof (tcp_header_t),
143 pg_tcp_header_init (p);
146 pg_edit_set_fixed (&p->seq_number, 0);
147 pg_edit_set_fixed (&p->ack_number, 0);
149 pg_edit_set_fixed (&p->tcp_header_u32s, sizeof (tcp_header_t) / sizeof (u32));
151 pg_edit_set_fixed (&p->window, 4096);
152 pg_edit_set_fixed (&p->urgent_pointer, 0);
154 #define _(f) pg_edit_set_fixed (&p->f##_flag, 0);
158 p->checksum.type = PG_EDIT_UNSPECIFIED;
160 if (! unformat (input, "TCP: %U -> %U",
162 unformat_tcp_udp_port, &p->ports.src,
164 unformat_tcp_udp_port, &p->ports.dst))
170 if (unformat (input, "window %U",
172 unformat_pg_number, &p->window))
175 else if (unformat (input, "checksum %U",
177 unformat_pg_number, &p->checksum))
181 #define _(f) else if (unformat (input, #f)) pg_edit_set_fixed (&p->f##_flag, 1);
185 /* Can't parse input: try next protocol level. */
191 ip_main_t * im = &ip_main;
193 tcp_udp_port_info_t * pi;
196 if (p->ports.dst.type == PG_EDIT_FIXED)
198 dst_port = pg_edit_get_value (&p->ports.dst, PG_EDIT_LO);
199 pi = ip_get_tcp_udp_port_info (im, dst_port);
202 if (pi && pi->unformat_pg_edit
203 && unformat_user (input, pi->unformat_pg_edit, s))
206 else if (! unformat_user (input, unformat_pg_payload, s))
209 if (p->checksum.type == PG_EDIT_UNSPECIFIED)
211 pg_edit_group_t * g = pg_stream_get_group (s, group_index);
212 g->edit_function = tcp_pg_edit_function;
213 g->edit_function_opaque = 0;
220 /* Free up any edits we may have added. */
221 pg_free_edit_group (s);