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/*
* ip/udp.h: udp protocol
*
* 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.
*/
#ifndef included_udp_h
#define included_udp_h
#include <vnet/vnet.h>
#include <vnet/ip/udp_packet.h>
#include <vnet/ip/ip.h>
#include <vnet/ip/ip4.h>
#include <vnet/ip/ip4_packet.h>
#include <vnet/pg/pg.h>
#include <vnet/ip/format.h>
typedef enum
{
#define udp_error(n,s) UDP_ERROR_##n,
#include <vnet/ip/udp_error.def>
#undef udp_error
UDP_N_ERROR,
} udp_error_t;
#define foreach_udp4_dst_port \
_ (67, dhcp_to_server) \
_ (68, dhcp_to_client) \
_ (500, ikev2) \
_ (3784, bfd4) \
_ (4341, lisp_gpe) \
_ (4342, lisp_cp) \
_ (4739, ipfix) \
_ (4789, vxlan) \
_ (4789, vxlan6) \
_ (4790, vxlan_gpe) \
_ (6633, vpath_3)
#define foreach_udp6_dst_port \
_ (547, dhcpv6_to_server) \
_ (546, dhcpv6_to_client) \
_ (3784, bfd6) \
_ (4341, lisp_gpe6) \
_ (4342, lisp_cp6) \
_ (4790, vxlan6_gpe) \
_ (6633, vpath6_3)
typedef enum
{
#define _(n,f) UDP_DST_PORT_##f = n,
foreach_udp4_dst_port foreach_udp6_dst_port
#undef _
} udp_dst_port_t;
typedef enum
{
#define _(n,f) UDP6_DST_PORT_##f = n,
foreach_udp6_dst_port
#undef _
} udp6_dst_port_t;
typedef struct
{
/* Name (a c string). */
char *name;
/* GRE protocol type in host byte order. */
udp_dst_port_t dst_port;
/* Node which handles this type. */
u32 node_index;
/* Next index for this type. */
u32 next_index;
} udp_dst_port_info_t;
typedef enum
{
UDP_IP6 = 0,
UDP_IP4, /* the code is full of is_ip4... */
N_UDP_AF,
} udp_af_t;
typedef struct
{
udp_dst_port_info_t *dst_port_infos[N_UDP_AF];
/* Hash tables mapping name/protocol to protocol info index. */
uword *dst_port_info_by_name[N_UDP_AF];
uword *dst_port_info_by_dst_port[N_UDP_AF];
/* convenience */
vlib_main_t *vlib_main;
} udp_main_t;
always_inline udp_dst_port_info_t *
udp_get_dst_port_info (udp_main_t * um, udp_dst_port_t dst_port, u8 is_ip4)
{
uword *p = hash_get (um->dst_port_info_by_dst_port[is_ip4], dst_port);
return p ? vec_elt_at_index (um->dst_port_infos[is_ip4], p[0]) : 0;
}
format_function_t format_udp_header;
format_function_t format_udp_rx_trace;
unformat_function_t unformat_udp_header;
void udp_register_dst_port (vlib_main_t * vm,
udp_dst_port_t dst_port,
u32 node_index, u8 is_ip4);
void udp_punt_unknown (vlib_main_t * vm, u8 is_ip4, u8 is_add);
always_inline void
ip_udp_fixup_one (vlib_main_t * vm, vlib_buffer_t * b0, u8 is_ip4)
{
u16 new_l0;
udp_header_t *udp0;
if (is_ip4)
{
ip4_header_t *ip0;
ip_csum_t sum0;
u16 old_l0 = 0;
ip0 = vlib_buffer_get_current (b0);
/* fix the <bleep>ing outer-IP checksum */
sum0 = ip0->checksum;
/* old_l0 always 0, see the rewrite setup */
new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
length /* changed member */ );
ip0->checksum = ip_csum_fold (sum0);
ip0->length = new_l0;
/* Fix UDP length */
udp0 = (udp_header_t *) (ip0 + 1);
new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
- sizeof (*ip0));
udp0->length = new_l0;
}
else
{
ip6_header_t *ip0;
int bogus0;
ip0 = vlib_buffer_get_current (b0);
new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
- sizeof (*ip0));
ip0->payload_length = new_l0;
/* Fix UDP length */
udp0 = (udp_header_t *) (ip0 + 1);
udp0->length = new_l0;
udp0->checksum =
ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0, &bogus0);
ASSERT (bogus0 == 0);
if (udp0->checksum == 0)
udp0->checksum = 0xffff;
}
}
always_inline void
ip_udp_encap_one (vlib_main_t * vm, vlib_buffer_t * b0, u8 * ec0, word ec_len,
u8 is_ip4)
{
vlib_buffer_advance (b0, -ec_len);
if (is_ip4)
{
ip4_header_t *ip0;
ip0 = vlib_buffer_get_current (b0);
/* Apply the encap string. */
clib_memcpy (ip0, ec0, ec_len);
ip_udp_fixup_one (vm, b0, 1);
}
else
{
ip6_header_t *ip0;
ip0 = vlib_buffer_get_current (b0);
/* Apply the encap string. */
clib_memcpy (ip0, ec0, ec_len);
ip_udp_fixup_one (vm, b0, 0);
}
}
always_inline void
ip_udp_encap_two (vlib_main_t * vm, vlib_buffer_t * b0, vlib_buffer_t * b1,
u8 * ec0, u8 * ec1, word ec_len, u8 is_v4)
{
u16 new_l0, new_l1;
udp_header_t *udp0, *udp1;
ASSERT (_vec_len (ec0) == _vec_len (ec1));
vlib_buffer_advance (b0, -ec_len);
vlib_buffer_advance (b1, -ec_len);
if (is_v4)
{
ip4_header_t *ip0, *ip1;
ip_csum_t sum0, sum1;
u16 old_l0 = 0, old_l1 = 0;
ip0 = vlib_buffer_get_current (b0);
ip1 = vlib_buffer_get_current (b1);
/* Apply the encap string */
clib_memcpy (ip0, ec0, ec_len);
clib_memcpy (ip1, ec1, ec_len);
/* fix the <bleep>ing outer-IP checksum */
sum0 = ip0->checksum;
sum1 = ip1->checksum;
/* old_l0 always 0, see the rewrite setup */
new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0));
new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1));
sum0 = ip_csum_update (sum0, old_l0, new_l0, ip4_header_t,
length /* changed member */ );
sum1 = ip_csum_update (sum1, old_l1, new_l1, ip4_header_t,
length /* changed member */ );
ip0->checksum = ip_csum_fold (sum0);
ip1->checksum = ip_csum_fold (sum1);
ip0->length = new_l0;
ip1->length = new_l1;
/* Fix UDP length */
udp0 = (udp_header_t *) (ip0 + 1);
udp1 = (udp_header_t *) (ip1 + 1);
new_l0 =
clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0) -
sizeof (*ip0));
new_l1 =
clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1) -
sizeof (*ip1));
udp0->length = new_l0;
udp1->length = new_l1;
}
else
{
ip6_header_t *ip0, *ip1;
int bogus0, bogus1;
ip0 = vlib_buffer_get_current (b0);
ip1 = vlib_buffer_get_current (b1);
/* Apply the encap string. */
clib_memcpy (ip0, ec0, ec_len);
clib_memcpy (ip1, ec1, ec_len);
new_l0 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b0)
- sizeof (*ip0));
new_l1 = clib_host_to_net_u16 (vlib_buffer_length_in_chain (vm, b1)
- sizeof (*ip1));
ip0->payload_length = new_l0;
ip1->payload_length = new_l1;
/* Fix UDP length */
udp0 = (udp_header_t *) (ip0 + 1);
udp1 = (udp_header_t *) (ip1 + 1);
udp0->length = new_l0;
udp1->length = new_l1;
udp0->checksum =
ip6_tcp_udp_icmp_compute_checksum (vm, b0, ip0, &bogus0);
udp1->checksum =
ip6_tcp_udp_icmp_compute_checksum (vm, b1, ip1, &bogus1);
ASSERT (bogus0 == 0);
ASSERT (bogus1 == 0);
if (udp0->checksum == 0)
udp0->checksum = 0xffff;
if (udp1->checksum == 0)
udp1->checksum = 0xffff;
}
}
#endif /* included_udp_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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