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/*
* Copyright (c) 2016 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 <lisp/lisp-cp/packets.h>
#include <lisp/lisp-cp/lisp_cp_messages.h>
#include <vnet/udp/udp_packet.h>
#include <vnet/ip/ip4_inlines.h>
#include <vnet/ip/ip6_inlines.h>
/* Returns IP ID for the packet */
/* static u16 ip_id = 0;
static inline u16
get_IP_ID()
{
ip_id++;
return (ip_id);
} */
u16
udp_ip4_checksum (const void *b, u32 len, u8 * src, u8 * dst)
{
const u16 *buf = b;
u16 *ip_src = (u16 *) src;
u16 *ip_dst = (u16 *) dst;
u32 length = len;
u32 sum = 0;
while (len > 1)
{
sum += *buf++;
if (sum & 0x80000000)
sum = (sum & 0xFFFF) + (sum >> 16);
len -= 2;
}
/* Add the padding if the packet length is odd */
if (len & 1)
sum += *((u8 *) buf);
/* Add the pseudo-header */
sum += *(ip_src++);
sum += *ip_src;
sum += *(ip_dst++);
sum += *ip_dst;
sum += clib_host_to_net_u16 (IP_PROTOCOL_UDP);
sum += clib_host_to_net_u16 (length);
/* Add the carries */
while (sum >> 16)
sum = (sum & 0xFFFF) + (sum >> 16);
/* Return the one's complement of sum */
return ((u16) (~sum));
}
u16
udp_ip6_checksum (ip6_header_t * ip6, udp_header_t * up, u32 len)
{
size_t i;
register const u16 *sp;
u32 sum;
union
{
struct
{
ip6_address_t ph_src;
ip6_address_t ph_dst;
u32 ph_len;
u8 ph_zero[3];
u8 ph_nxt;
} ph;
u16 pa[20];
} phu;
/* pseudo-header */
clib_memset (&phu, 0, sizeof (phu));
phu.ph.ph_src = ip6->src_address;
phu.ph.ph_dst = ip6->dst_address;
phu.ph.ph_len = clib_host_to_net_u32 (len);
phu.ph.ph_nxt = IP_PROTOCOL_UDP;
sum = 0;
for (i = 0; i < sizeof (phu.pa) / sizeof (phu.pa[0]); i++)
sum += phu.pa[i];
sp = (const u16 *) up;
for (i = 0; i < (len & ~1); i += 2)
sum += *sp++;
if (len & 1)
sum += clib_host_to_net_u16 ((*(const u8 *) sp) << 8);
while (sum > 0xffff)
sum = (sum & 0xffff) + (sum >> 16);
sum = ~sum & 0xffff;
return (sum);
}
u16
udp_checksum (udp_header_t * uh, u32 udp_len, void *ih, u8 version)
{
switch (version)
{
case AF_IP4:
return (udp_ip4_checksum (uh, udp_len,
((ip4_header_t *) ih)->src_address.as_u8,
((ip4_header_t *) ih)->dst_address.as_u8));
case AF_IP6:
return (udp_ip6_checksum (ih, uh, udp_len));
default:
return ~0;
}
}
void *
pkt_push_udp (vlib_main_t * vm, vlib_buffer_t * b, u16 sp, u16 dp)
{
udp_header_t *uh;
u16 udp_len = sizeof (udp_header_t) + vlib_buffer_length_in_chain (vm, b);
uh = vlib_buffer_push_uninit (b, sizeof (*uh));
uh->src_port = clib_host_to_net_u16 (sp);
uh->dst_port = clib_host_to_net_u16 (dp);
uh->length = clib_host_to_net_u16 (udp_len);
uh->checksum = 0;
return uh;
}
void *
pkt_push_ip (vlib_main_t * vm, vlib_buffer_t * b, ip_address_t * src,
ip_address_t * dst, u32 proto, u8 csum_offload)
{
if (ip_addr_version (src) != ip_addr_version (dst))
{
clib_warning ("src %U and dst %U IP have different AFI! Discarding!",
format_ip_address, src, format_ip_address, dst);
return 0;
}
switch (ip_addr_version (src))
{
case AF_IP4:
return vlib_buffer_push_ip4 (vm, b, &ip_addr_v4 (src),
&ip_addr_v4 (dst), proto, csum_offload);
break;
case AF_IP6:
return vlib_buffer_push_ip6 (vm, b, &ip_addr_v6 (src),
&ip_addr_v6 (dst), proto);
break;
}
return 0;
}
void *
pkt_push_udp_and_ip (vlib_main_t * vm, vlib_buffer_t * b, u16 sp, u16 dp,
ip_address_t * sip, ip_address_t * dip, u8 csum_offload)
{
u16 udpsum;
udp_header_t *uh;
void *ih;
uh = pkt_push_udp (vm, b, sp, dp);
if (csum_offload)
{
ih = pkt_push_ip (vm, b, sip, dip, IP_PROTOCOL_UDP, 1);
vnet_buffer_offload_flags_set (b, VNET_BUFFER_OFFLOAD_F_UDP_CKSUM);
vnet_buffer (b)->l3_hdr_offset = (u8 *) ih - b->data;
vnet_buffer (b)->l4_hdr_offset = (u8 *) uh - b->data;
uh->checksum = 0;
}
else
{
ih = pkt_push_ip (vm, b, sip, dip, IP_PROTOCOL_UDP, 0);
udpsum = udp_checksum (uh, clib_net_to_host_u16 (uh->length), ih,
ip_addr_version (sip));
if (udpsum == (u16) ~ 0)
{
clib_warning ("Failed UDP checksum! Discarding");
return 0;
}
/* clear flags used for csum since we're not offloading */
b->flags &= ~(VNET_BUFFER_F_IS_IP4 | VNET_BUFFER_F_IS_IP6);
uh->checksum = udpsum;
}
return ih;
}
void *
pkt_push_ecm_hdr (vlib_buffer_t * b)
{
ecm_hdr_t *h;
h = vlib_buffer_push_uninit (b, sizeof (h[0]));
clib_memset (h, 0, sizeof (h[0]));
h->type = LISP_ENCAP_CONTROL_TYPE;
clib_memset (h->reserved2, 0, sizeof (h->reserved2));
return h;
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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