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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 <vnet/lisp-cp/lisp_msg_serdes.h>
#include <vnet/lisp-cp/packets.h>
#include <vppinfra/time.h>
void *lisp_msg_put_gid (vlib_buffer_t * b, gid_address_t * gid);
static void
lisp_msg_put_locators (vlib_buffer_t * b, locator_t * locators)
{
locator_t *loc;
vec_foreach (loc, locators)
{
u8 *p = vlib_buffer_put_uninit (b, sizeof (locator_hdr_t));
memset (p, 0, sizeof (locator_hdr_t));
LOC_PRIORITY (p) = loc->priority;
LOC_MPRIORITY (p) = loc->mpriority;
LOC_WEIGHT (p) = loc->weight;
LOC_MWEIGHT (p) = loc->mweight;
LOC_LOCAL (p) = loc->local;
LOC_PROBED (p) = loc->probed ? 1 : 0;
lisp_msg_put_gid (b, &loc->address);
}
}
static void
lisp_msg_put_mapping_record (vlib_buffer_t * b, mapping_t * record)
{
mapping_record_hdr_t *p =
vlib_buffer_put_uninit (b, sizeof (mapping_record_hdr_t));
gid_address_t *eid = &record->eid;
memset (p, 0, sizeof (*p));
MAP_REC_EID_PLEN (p) = gid_address_len (eid);
MAP_REC_TTL (p) = clib_host_to_net_u32 (record->ttl);
MAP_REC_AUTH (p) = record->authoritative ? 1 : 0;
MAP_REC_LOC_COUNT (p) = vec_len (record->locators);
lisp_msg_put_gid (b, eid);
lisp_msg_put_locators (b, record->locators);
}
static void
lisp_msg_put_mreg_records (vlib_buffer_t * b, mapping_t * records)
{
u32 i;
for (i = 0; i < vec_len (records); i++)
lisp_msg_put_mapping_record (b, &records[i]);
}
void *
lisp_msg_put_gid (vlib_buffer_t * b, gid_address_t * gid)
{
u8 *p = 0;
if (!gid)
{
/* insert only src-eid-afi field set to 0 */
p = vlib_buffer_put_uninit (b, sizeof (u16));
*(u16 *) p = 0;
}
else
{
p = vlib_buffer_put_uninit (b, gid_address_size_to_put (gid));
gid_address_put (p, gid);
}
return p;
}
static void *
lisp_msg_put_itr_rlocs (lisp_cp_main_t * lcm, vlib_buffer_t * b,
gid_address_t * rlocs, u8 * locs_put)
{
u8 *bp, count = 0;
u32 i;
bp = vlib_buffer_get_current (b);
for (i = 0; i < vec_len (rlocs); i++)
{
lisp_msg_put_gid (b, &rlocs[i]);
count++;
}
*locs_put = count - 1;
return bp;
}
void *
lisp_msg_put_eid_rec (vlib_buffer_t * b, gid_address_t * eid)
{
eid_record_hdr_t *h = vlib_buffer_put_uninit (b, sizeof (*h));
memset (h, 0, sizeof (*h));
EID_REC_MLEN (h) = gid_address_len (eid);
lisp_msg_put_gid (b, eid);
return h;
}
u64
nonce_build (u32 seed)
{
u64 nonce;
u32 nonce_lower;
u32 nonce_upper;
struct timespec ts;
/* Put nanosecond clock in lower 32-bits and put an XOR of the nanosecond
* clock with the seond clock in the upper 32-bits. */
syscall (SYS_clock_gettime, CLOCK_REALTIME, &ts);
nonce_lower = ts.tv_nsec;
nonce_upper = ts.tv_sec ^ clib_host_to_net_u32 (nonce_lower);
/* OR in a caller provided seed to the low-order 32-bits. */
nonce_lower |= seed;
/* Return 64-bit nonce. */
nonce = nonce_upper;
nonce = (nonce << 32) | nonce_lower;
return nonce;
}
void *
lisp_msg_put_map_reply (vlib_buffer_t * b, mapping_t * records, u64 nonce,
u8 probe_bit)
{
map_reply_hdr_t *h = vlib_buffer_put_uninit (b, sizeof (h[0]));
memset (h, 0, sizeof (h[0]));
MREP_TYPE (h) = LISP_MAP_REPLY;
MREP_NONCE (h) = nonce;
MREP_REC_COUNT (h) = 1;
MREP_RLOC_PROBE (h) = probe_bit;
lisp_msg_put_mreg_records (b, records);
return h;
}
void *
lisp_msg_put_map_register (vlib_buffer_t * b, mapping_t * records,
u8 want_map_notify, u16 auth_data_len, u64 * nonce,
u32 * msg_len)
{
u8 *auth_data = 0;
/* Basic header init */
map_register_hdr_t *h = vlib_buffer_put_uninit (b, sizeof (h[0]));
memset (h, 0, sizeof (h[0]));
MREG_TYPE (h) = LISP_MAP_REGISTER;
MREG_NONCE (h) = nonce_build (0);
MREG_WANT_MAP_NOTIFY (h) = want_map_notify ? 1 : 0;
MREG_REC_COUNT (h) = vec_len (records);
auth_data = vlib_buffer_put_uninit (b, auth_data_len);
memset (auth_data, 0, auth_data_len);
/* Put map register records */
lisp_msg_put_mreg_records (b, records);
nonce[0] = MREG_NONCE (h);
msg_len[0] = vlib_buffer_get_tail (b) - (u8 *) h;
return h;
}
void *
lisp_msg_put_mreq (lisp_cp_main_t * lcm, vlib_buffer_t * b,
gid_address_t * seid, gid_address_t * deid,
gid_address_t * rlocs, u8 is_smr_invoked,
u8 rloc_probe_set, u64 * nonce)
{
u8 loc_count = 0;
/* Basic header init */
map_request_hdr_t *h = vlib_buffer_put_uninit (b, sizeof (h[0]));
memset (h, 0, sizeof (h[0]));
MREQ_TYPE (h) = LISP_MAP_REQUEST;
MREQ_NONCE (h) = nonce_build (0);
MREQ_SMR_INVOKED (h) = is_smr_invoked ? 1 : 0;
MREQ_RLOC_PROBE (h) = rloc_probe_set ? 1 : 0;
/* We're adding one eid record */
increment_record_count (h);
/* Fill source eid */
lisp_msg_put_gid (b, seid);
/* Put itr rlocs */
lisp_msg_put_itr_rlocs (lcm, b, rlocs, &loc_count);
MREQ_ITR_RLOC_COUNT (h) = loc_count;
/* Put eid record */
lisp_msg_put_eid_rec (b, deid);
nonce[0] = MREQ_NONCE (h);
return h;
}
void *
lisp_msg_push_ecm (vlib_main_t * vm, vlib_buffer_t * b, int lp, int rp,
gid_address_t * la, gid_address_t * ra)
{
ecm_hdr_t *h;
ip_address_t _src_ip, *src_ip = &_src_ip, _dst_ip, *dst_ip = &_dst_ip;
if (gid_address_type (la) != GID_ADDR_IP_PREFIX)
{
/* empty ip4 */
memset (src_ip, 0, sizeof (src_ip[0]));
memset (dst_ip, 0, sizeof (dst_ip[0]));
}
else
{
src_ip = &gid_address_ip (la);
dst_ip = &gid_address_ip (ra);
}
/* Push inner ip and udp */
pkt_push_udp_and_ip (vm, b, lp, rp, src_ip, dst_ip);
/* Push lisp ecm hdr */
h = pkt_push_ecm_hdr (b);
return h;
}
static u32
msg_type_to_hdr_len (lisp_msg_type_e type)
{
switch (type)
{
case LISP_MAP_REQUEST:
return (sizeof (map_request_hdr_t));
case LISP_MAP_REPLY:
return (sizeof (map_reply_hdr_t));
default:
return (0);
}
}
void *
lisp_msg_pull_hdr (vlib_buffer_t * b, lisp_msg_type_e type)
{
return vlib_buffer_pull (b, msg_type_to_hdr_len (type));
}
u32
lisp_msg_parse_addr (vlib_buffer_t * b, gid_address_t * eid)
{
u32 len;
memset (eid, 0, sizeof (*eid));
len = gid_address_parse (vlib_buffer_get_current (b), eid);
if (len != ~0)
vlib_buffer_pull (b, len);
return len;
}
u32
lisp_msg_parse_eid_rec (vlib_buffer_t * b, gid_address_t * eid)
{
eid_record_hdr_t *h = vlib_buffer_get_current (b);
u32 len;
memset (eid, 0, sizeof (*eid));
len = gid_address_parse (EID_REC_ADDR (h), eid);
if (len == ~0)
return len;
gid_address_ippref_len (eid) = EID_REC_MLEN (h);
vlib_buffer_pull (b, len + sizeof (eid_record_hdr_t));
return len + sizeof (eid_record_hdr_t);
}
u32
lisp_msg_parse_itr_rlocs (vlib_buffer_t * b, gid_address_t ** rlocs,
u8 rloc_count)
{
gid_address_t tloc;
u32 i, len = 0, tlen = 0;
//MREQ_ITR_RLOC_COUNT(mreq_hdr) + 1
for (i = 0; i < rloc_count; i++)
{
len = lisp_msg_parse_addr (b, &tloc);
if (len == ~0)
return len;
vec_add1 (*rlocs, tloc);
tlen += len;
}
return tlen;
}
u32
lisp_msg_parse_loc (vlib_buffer_t * b, locator_t * loc)
{
int len;
len = locator_parse (vlib_buffer_get_current (b), loc);
if (len == ~0)
return ~0;
vlib_buffer_pull (b, len);
return len;
}
u32
lisp_msg_parse_mapping_record (vlib_buffer_t * b, gid_address_t * eid,
locator_t ** locs, locator_t * probed_)
{
void *h = 0, *loc_hdr = 0;
locator_t loc, *probed = 0;
int i = 0, len = 0, llen = 0;
h = vlib_buffer_get_current (b);
vlib_buffer_pull (b, sizeof (mapping_record_hdr_t));
memset (eid, 0, sizeof (*eid));
len = gid_address_parse (vlib_buffer_get_current (b), eid);
if (len == ~0)
return len;
vlib_buffer_pull (b, len);
if (GID_ADDR_IP_PREFIX == gid_address_type (eid))
gid_address_ippref_len (eid) = MAP_REC_EID_PLEN (h);
for (i = 0; i < MAP_REC_LOC_COUNT (h); i++)
{
loc_hdr = vlib_buffer_get_current (b);
llen = lisp_msg_parse_loc (b, &loc);
if (llen == ~0)
return llen;
vec_add1 (*locs, loc);
len += llen;
if (LOC_PROBED (loc_hdr))
{
if (probed != 0)
clib_warning
("Multiple locators probed! Probing only the first!");
else
probed = &loc;
}
}
/* XXX */
if (probed_ != 0 && probed)
*probed_ = *probed;
return len + sizeof (map_reply_hdr_t);
}
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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