2 * ip/udp.h: udp protocol
4 * Copyright (c) 2013 Cisco and/or its affiliates.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
18 #ifndef included_udp_h
19 #define included_udp_h
21 #include <vnet/vnet.h>
22 #include <vnet/ip/udp_packet.h>
23 #include <vnet/ip/ip.h>
24 #include <vnet/ip/ip4.h>
25 #include <vnet/ip/ip4_packet.h>
26 #include <vnet/pg/pg.h>
27 #include <vnet/ip/format.h>
30 #define udp_error(n,s) UDP_ERROR_##n,
31 #include <vnet/ip/udp_error.def>
36 #define foreach_udp4_dst_port \
37 _ (67, dhcp_to_server) \
38 _ (68, dhcp_to_client) \
48 #define foreach_udp6_dst_port \
49 _ (547, dhcpv6_to_server) \
50 _ (546, dhcpv6_to_client) \
55 #define _(n,f) UDP_DST_PORT_##f = n,
62 #define _(n,f) UDP6_DST_PORT_##f = n,
68 /* Name (a c string). */
71 /* GRE protocol type in host byte order. */
72 udp_dst_port_t dst_port;
74 /* Node which handles this type. */
77 /* Next index for this type. */
79 } udp_dst_port_info_t;
83 UDP_IP4, /* the code is full of is_ip4... */
88 udp_dst_port_info_t * dst_port_infos [N_UDP_AF];
90 /* Hash tables mapping name/protocol to protocol info index. */
91 uword * dst_port_info_by_name[N_UDP_AF];
92 uword * dst_port_info_by_dst_port[N_UDP_AF];
95 vlib_main_t * vlib_main;
98 always_inline udp_dst_port_info_t *
99 udp_get_dst_port_info (udp_main_t * um, udp_dst_port_t dst_port, u8 is_ip4)
101 uword * p = hash_get (um->dst_port_info_by_dst_port[is_ip4], dst_port);
102 return p ? vec_elt_at_index (um->dst_port_infos[is_ip4], p[0]) : 0;
105 format_function_t format_udp_header;
106 format_function_t format_udp_rx_trace;
108 unformat_function_t unformat_udp_header;
110 void udp_register_dst_port (vlib_main_t * vm,
111 udp_dst_port_t dst_port,
112 u32 node_index, u8 is_ip4);
115 ip4_udp_encap_one (vlib_main_t * vm, vlib_buffer_t * b0, u8 * ec0, word ec_len)
123 vlib_buffer_advance (b0, - ec_len);
124 ip0 = vlib_buffer_get_current(b0);
126 /* Apply the encap string. */
127 clib_memcpy(ip0, ec0, ec_len);
129 /* fix the <bleep>ing outer-IP checksum */
130 sum0 = ip0->checksum;
131 /* old_l0 always 0, see the rewrite setup */
132 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
134 sum0 = ip_csum_update(sum0, old_l0, new_l0, ip4_header_t,
135 length /* changed member */);
136 ip0->checksum = ip_csum_fold (sum0);
137 ip0->length = new_l0;
140 udp0 = (udp_header_t *)(ip0+1);
141 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
144 udp0->length = new_l0;
148 ip4_udp_encap_two (vlib_main_t * vm, vlib_buffer_t * b0, vlib_buffer_t * b1,
149 u8 * ec0, u8 * ec1, word ec_len)
151 ip4_header_t * ip0, *ip1;
152 ip_csum_t sum0, sum1;
153 u16 old_l0 = 0, old_l1 = 0;
155 udp_header_t * udp0, *udp1;
157 ASSERT(_vec_len(ec0) == _vec_len(ec1));
159 vlib_buffer_advance (b0, -ec_len);
160 vlib_buffer_advance (b1, -ec_len);
162 ip0 = vlib_buffer_get_current (b0);
163 ip1 = vlib_buffer_get_current (b1);
165 /* Apply the encap string */
166 clib_memcpy (ip0, ec0, ec_len);
167 clib_memcpy (ip1, ec1, ec_len);
169 /* fix the <bleep>ing outer-IP checksum */
170 sum0 = ip0->checksum;
171 sum1 = ip1->checksum;
173 /* old_l0 always 0, see the rewrite setup */
174 new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
175 new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
177 sum0 = ip_csum_update(sum0, old_l0, new_l0, ip4_header_t,
178 length /* changed member */);
179 sum1 = ip_csum_update(sum1, old_l1, new_l1, ip4_header_t,
180 length /* changed member */);
182 ip0->checksum = ip_csum_fold (sum0);
183 ip1->checksum = ip_csum_fold (sum1);
185 ip0->length = new_l0;
186 ip1->length = new_l1;
189 udp0 = (udp_header_t *) (ip0 + 1);
190 udp1 = (udp_header_t *) (ip1 + 1);
192 new_l0 = clib_host_to_net_u16 (
193 vlib_buffer_length_in_chain (vm, b0) - sizeof(*ip0));
194 new_l1 = clib_host_to_net_u16 (
195 vlib_buffer_length_in_chain (vm, b1) - sizeof(*ip1));
196 udp0->length = new_l0;
197 udp1->length = new_l1;
201 #endif /* included_udp_h */