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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-gpe/lisp_gpe.h>
lisp_gpe_main_t lisp_gpe_main;
static int
lisp_gpe_rewrite (lisp_gpe_tunnel_t * t)
{
u8 *rw = 0;
lisp_gpe_header_t * lisp0;
int len;
if (ip_addr_version(&t->src) == IP4)
{
ip4_header_t * ip0;
ip4_udp_lisp_gpe_header_t * h0;
len = sizeof(*h0);
vec_validate_aligned(rw, len - 1, CLIB_CACHE_LINE_BYTES);
h0 = (ip4_udp_lisp_gpe_header_t *) rw;
/* Fixed portion of the (outer) ip4 header */
ip0 = &h0->ip4;
ip0->ip_version_and_header_length = 0x45;
ip0->ttl = 254;
ip0->protocol = IP_PROTOCOL_UDP;
/* we fix up the ip4 header length and checksum after-the-fact */
ip_address_copy_addr(&ip0->src_address, &t->src);
ip_address_copy_addr(&ip0->dst_address, &t->dst);
ip0->checksum = ip4_header_checksum (ip0);
/* UDP header, randomize src port on something, maybe? */
h0->udp.src_port = clib_host_to_net_u16 (4341);
h0->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_lisp_gpe);
/* LISP-gpe header */
lisp0 = &h0->lisp;
}
else
{
ip6_header_t * ip0;
ip6_udp_lisp_gpe_header_t * h0;
len = sizeof(*h0);
vec_validate_aligned(rw, len - 1, CLIB_CACHE_LINE_BYTES);
h0 = (ip6_udp_lisp_gpe_header_t *) rw;
/* Fixed portion of the (outer) ip6 header */
ip0 = &h0->ip6;
ip0->ip_version_traffic_class_and_flow_label =
clib_host_to_net_u32 (0x6 << 28);
ip0->hop_limit = 254;
ip0->protocol = IP_PROTOCOL_UDP;
/* we fix up the ip6 header length after-the-fact */
ip_address_copy_addr(&ip0->src_address, &t->src);
ip_address_copy_addr(&ip0->dst_address, &t->dst);
/* UDP header, randomize src port on something, maybe? */
h0->udp.src_port = clib_host_to_net_u16 (4341);
h0->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_lisp_gpe);
/* LISP-gpe header */
lisp0 = &h0->lisp;
}
lisp0->flags = t->flags;
lisp0->ver_res = t->ver_res;
lisp0->res = t->res;
lisp0->next_protocol = t->next_protocol;
lisp0->iid = clib_host_to_net_u32 (t->vni);
t->rewrite = rw;
return 0;
}
/* TODO remove */
int
vnet_lisp_gpe_add_del_tunnel (vnet_lisp_gpe_add_del_tunnel_args_t *a,
u32 * sw_if_indexp)
{
clib_warning ("UNSUPPORTED! Use vnet_lisp_gpe_add_del_fwd_entry");
return 0;
}
#define foreach_copy_field \
_(encap_fib_index) \
_(decap_fib_index) \
_(decap_next_index) \
_(flags) \
_(next_protocol) \
_(ver_res) \
_(res) \
_(vni)
static u32
add_del_tunnel (vnet_lisp_gpe_add_del_fwd_entry_args_t *a, u32 * tun_index_res)
{
lisp_gpe_main_t * lgm = &lisp_gpe_main;
lisp_gpe_tunnel_t *t = 0;
uword * p;
int rv;
lisp_gpe_tunnel_key_t key;
memset(&key, 0, sizeof(key));
ip_prefix_copy(&key.eid, &gid_address_ippref(&a->deid));
ip_address_copy(&key.dst_loc, &a->dlocator);
key.iid = clib_host_to_net_u32 (a->vni);
p = mhash_get (&lgm->lisp_gpe_tunnel_by_key, &key);
if (a->is_add)
{
/* adding a tunnel: tunnel must not already exist */
if (p)
return VNET_API_ERROR_INVALID_VALUE;
if (a->decap_next_index >= LISP_GPE_INPUT_N_NEXT)
return VNET_API_ERROR_INVALID_DECAP_NEXT;
pool_get_aligned (lgm->tunnels, t, CLIB_CACHE_LINE_BYTES);
memset (t, 0, sizeof (*t));
/* copy from arg structure */
#define _(x) t->x = a->x;
foreach_copy_field;
#undef _
ip_address_copy(&t->src, &a->slocator);
ip_address_copy(&t->dst, &a->dlocator);
rv = lisp_gpe_rewrite (t);
if (rv)
{
pool_put(lgm->tunnels, t);
return rv;
}
mhash_set(&lgm->lisp_gpe_tunnel_by_key, &key, t - lgm->tunnels, 0);
/* return tunnel index */
if (tun_index_res)
tun_index_res[0] = t - lgm->tunnels;
}
else
{
/* deleting a tunnel: tunnel must exist */
if (!p)
{
clib_warning("Tunnel for eid %U doesn't exist!", format_gid_address,
&a->deid);
return VNET_API_ERROR_NO_SUCH_ENTRY;
}
t = pool_elt_at_index(lgm->tunnels, p[0]);
mhash_unset(&lgm->lisp_gpe_tunnel_by_key, &key, 0);
vec_free(t->rewrite);
pool_put(lgm->tunnels, t);
}
return 0;
}
static int
add_del_negative_fwd_entry (lisp_gpe_main_t * lgm,
vnet_lisp_gpe_add_del_fwd_entry_args_t * a)
{
ip_adjacency_t adj;
/* setup adjacency for eid */
memset (&adj, 0, sizeof(adj));
adj.n_adj = 1;
adj.explicit_fib_index = ~0;
ip_prefix_t * dpref = &gid_address_ippref(&a->deid);
ip_prefix_t * spref = &gid_address_ippref(&a->seid);
switch (a->action)
{
case NO_ACTION:
/* TODO update timers? */
case FORWARD_NATIVE:
/* TODO check if route/next-hop for eid exists in fib and add
* more specific for the eid with the next-hop found */
case SEND_MAP_REQUEST:
/* TODO insert tunnel that always sends map-request */
case DROP:
/* for drop fwd entries, just add route, no need to add encap tunnel */
adj.lookup_next_index = ip_prefix_version(dpref) == IP4 ?
LGPE_IP4_LOOKUP_NEXT_DROP : LGPE_IP6_LOOKUP_NEXT_DROP;
/* add/delete route for prefix */
return ip_sd_fib_add_del_route (lgm, dpref, spref, a->table_id, &adj,
a->is_add);
break;
default:
return -1;
}
}
int
vnet_lisp_gpe_add_del_fwd_entry (vnet_lisp_gpe_add_del_fwd_entry_args_t * a,
u32 * hw_if_indexp)
{
lisp_gpe_main_t * lgm = &lisp_gpe_main;
ip_adjacency_t adj, * adjp;
u32 adj_index, rv, tun_index = ~0;
ip_prefix_t * dpref, * spref;
uword * lookup_next_index, * lgpe_sw_if_index, * lnip;
u8 ip_ver;
/* treat negative fwd entries separately */
if (a->is_negative)
return add_del_negative_fwd_entry (lgm, a);
dpref = &gid_address_ippref(&a->deid);
spref = &gid_address_ippref(&a->seid);
ip_ver = ip_prefix_version(dpref);
a->next_protocol = ip_ver == IP4 ?
LISP_GPE_NEXT_PROTO_IP4 : LISP_GPE_NEXT_PROTO_IP6;
a->flags |= LISP_GPE_FLAGS_P;
/* add/del tunnel to tunnels pool and prepares rewrite */
rv = add_del_tunnel (a, &tun_index);
if (rv)
return rv;
/* setup adjacency for eid */
memset (&adj, 0, sizeof(adj));
adj.n_adj = 1;
adj.explicit_fib_index = ~0;
if (a->is_add)
{
/* send packets that hit this adj to lisp-gpe interface output node in
* requested vrf. */
lnip = ip_ver == IP4 ?
lgm->lgpe_ip4_lookup_next_index_by_table_id :
lgm->lgpe_ip6_lookup_next_index_by_table_id;
lookup_next_index = hash_get(lnip, a->table_id);
lgpe_sw_if_index = hash_get(lgm->lisp_gpe_hw_if_index_by_table_id,
a->table_id);
/* the assumption is that the interface must've been created before
* programming the dp */
ASSERT(lookup_next_index != 0);
ASSERT(lgpe_sw_if_index != 0);
adj.lookup_next_index = lookup_next_index[0];
adj.rewrite_header.node_index = tun_index;
adj.rewrite_header.sw_if_index = lgpe_sw_if_index[0];
}
/* add/delete route for prefix */
rv = ip_sd_fib_add_del_route (lgm, dpref, spref, a->table_id, &adj,
a->is_add);
/* check that everything worked */
if (CLIB_DEBUG && a->is_add)
{
adj_index = ip_sd_fib_get_route (lgm, dpref, spref, a->table_id);
ASSERT(adj_index != 0);
adjp = ip_get_adjacency ((ip_ver == IP4) ? lgm->lm4 : lgm->lm6,
adj_index);
ASSERT(adjp != 0);
ASSERT(adjp->rewrite_header.node_index == tun_index);
}
return rv;
}
static clib_error_t *
lisp_gpe_add_del_fwd_entry_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, * line_input = &_line_input;
u8 is_add = 1;
ip_address_t slocator, dlocator, *slocators = 0, *dlocators = 0;
ip_prefix_t * prefp;
gid_address_t * eids = 0, eid;
clib_error_t * error = 0;
u32 i;
prefp = &gid_address_ippref(&eid);
/* Get a line of input. */
if (! unformat_user (input, unformat_line_input, line_input))
return 0;
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (line_input, "del"))
is_add = 0;
else if (unformat (line_input, "add"))
is_add = 1;
else if (unformat (line_input, "eid %U slocator %U dlocator %U",
unformat_ip_prefix, prefp,
unformat_ip_address, &slocator,
unformat_ip_address, &dlocator))
{
vec_add1 (eids, eid);
vec_add1 (slocators, slocator);
vec_add1 (dlocators, dlocator);
}
else
{
error = unformat_parse_error (line_input);
goto done;
}
}
unformat_free (line_input);
if (vec_len (eids) + vec_len (slocators) == 0)
{
error = clib_error_return (0, "expected ip4/ip6 eids/locators.");
goto done;
}
if (vec_len (eids) != vec_len (slocators))
{
error = clib_error_return (0, "number of eids not equal to that of "
"locators.");
goto done;
}
for (i = 0; i < vec_len(eids); i++)
{
vnet_lisp_gpe_add_del_fwd_entry_args_t a;
memset (&a, 0, sizeof(a));
a.is_add = is_add;
a.deid = eids[i];
a.slocator = slocators[i];
a.dlocator = dlocators[i];
prefp = &gid_address_ippref(&a.deid);
a.decap_next_index = (ip_prefix_version(prefp) == IP4) ?
LISP_GPE_INPUT_NEXT_IP4_INPUT : LISP_GPE_INPUT_NEXT_IP6_INPUT;
vnet_lisp_gpe_add_del_fwd_entry (&a, 0);
}
done:
vec_free(eids);
vec_free(slocators);
return error;
}
VLIB_CLI_COMMAND (add_del_lisp_gpe_mapping_tunnel_command, static) = {
.path = "lisp gpe maptunnel",
.short_help = "lisp gpe maptunnel eid <eid> sloc <src-locator> "
"dloc <dst-locator> [del]",
.function = lisp_gpe_add_del_fwd_entry_command_fn,
};
static u8 *
format_decap_next (u8 * s, va_list * args)
{
u32 next_index = va_arg (*args, u32);
switch (next_index)
{
case LISP_GPE_INPUT_NEXT_DROP:
return format (s, "drop");
case LISP_GPE_INPUT_NEXT_IP4_INPUT:
return format (s, "ip4");
case LISP_GPE_INPUT_NEXT_IP6_INPUT:
return format (s, "ip6");
default:
return format (s, "unknown %d", next_index);
}
return s;
}
u8 *
format_lisp_gpe_tunnel (u8 * s, va_list * args)
{
lisp_gpe_tunnel_t * t = va_arg (*args, lisp_gpe_tunnel_t *);
lisp_gpe_main_t * lgm = &lisp_gpe_main;
s = format (s,
"[%d] %U (src) %U (dst) fibs: encap %d, decap %d",
t - lgm->tunnels,
format_ip_address, &t->src,
format_ip_address, &t->dst,
t->encap_fib_index,
t->decap_fib_index);
s = format (s, " decap next %U\n", format_decap_next, t->decap_next_index);
s = format (s, "lisp ver %d ", (t->ver_res>>6));
#define _(n,v) if (t->flags & v) s = format (s, "%s-bit ", #n);
foreach_lisp_gpe_flag_bit;
#undef _
s = format (s, "next_protocol %d ver_res %x res %x\n",
t->next_protocol, t->ver_res, t->res);
s = format (s, "iid %d (0x%x)\n", t->vni, t->vni);
return s;
}
static clib_error_t *
show_lisp_gpe_tunnel_command_fn (vlib_main_t * vm,
unformat_input_t * input,
vlib_cli_command_t * cmd)
{
lisp_gpe_main_t * lgm = &lisp_gpe_main;
lisp_gpe_tunnel_t * t;
if (pool_elts (lgm->tunnels) == 0)
vlib_cli_output (vm, "No lisp-gpe tunnels configured...");
pool_foreach (t, lgm->tunnels,
({
vlib_cli_output (vm, "%U", format_lisp_gpe_tunnel, t);
}));
return 0;
}
VLIB_CLI_COMMAND (show_lisp_gpe_tunnel_command, static) = {
.path = "show lisp gpe tunnel",
.function = show_lisp_gpe_tunnel_command_fn,
};
clib_error_t *
vnet_lisp_gpe_enable_disable (vnet_lisp_gpe_enable_disable_args_t * a)
{
lisp_gpe_main_t * lgm = &lisp_gpe_main;
vnet_main_t * vnm = lgm->vnet_main;
if (a->is_en)
{
/* add lgpe_ip4_lookup as possible next_node for ip4 lookup */
if (lgm->ip4_lookup_next_lgpe_ip4_lookup == ~0)
{
lgm->ip4_lookup_next_lgpe_ip4_lookup = vlib_node_add_next (
vnm->vlib_main, ip4_lookup_node.index,
lgpe_ip4_lookup_node.index);
}
/* add lgpe_ip6_lookup as possible next_node for ip6 lookup */
if (lgm->ip6_lookup_next_lgpe_ip6_lookup == ~0)
{
lgm->ip6_lookup_next_lgpe_ip6_lookup = vlib_node_add_next (
vnm->vlib_main, ip6_lookup_node.index,
lgpe_ip6_lookup_node.index);
}
else
{
/* ask cp to re-add ifaces and defaults */
}
}
else
{
CLIB_UNUSED(uword * val);
hash_pair_t * p;
u32 * table_ids = 0, * table_id;
lisp_gpe_tunnel_key_t * tunnels = 0, * tunnel;
vnet_lisp_gpe_add_del_fwd_entry_args_t _at, * at = &_at;
vnet_lisp_gpe_add_del_iface_args_t _ai, * ai= &_ai;
/* remove all tunnels */
mhash_foreach(tunnel, val, &lgm->lisp_gpe_tunnel_by_key, ({
vec_add1(tunnels, tunnel[0]);
}));
vec_foreach(tunnel, tunnels) {
memset(at, 0, sizeof(at[0]));
at->is_add = 0;
gid_address_type(&at->deid) = GID_ADDR_IP_PREFIX;
ip_prefix_copy(&gid_address_ippref(&at->deid), &tunnel->eid);
ip_address_copy(&at->dlocator, &tunnel->dst_loc);
vnet_lisp_gpe_add_del_fwd_entry (at, 0);
}
vec_free(tunnels);
/* disable all ifaces */
hash_foreach_pair(p, lgm->lisp_gpe_hw_if_index_by_table_id, ({
vec_add1(table_ids, p->key);
}));
vec_foreach(table_id, table_ids) {
ai->is_add = 0;
ai->table_id = table_id[0];
/* disables interface and removes defaults */
vnet_lisp_gpe_add_del_iface(ai, 0);
}
vec_free(table_ids);
}
return 0;
}
static clib_error_t *
lisp_gpe_enable_disable_command_fn (vlib_main_t * vm, unformat_input_t * input,
vlib_cli_command_t * cmd)
{
unformat_input_t _line_input, * line_input = &_line_input;
u8 is_en = 1;
vnet_lisp_gpe_enable_disable_args_t _a, * a = &_a;
/* Get a line of input. */
if (! unformat_user (input, unformat_line_input, line_input))
return 0;
while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
{
if (unformat (line_input, "enable"))
is_en = 1;
else if (unformat (line_input, "disable"))
is_en = 0;
else
{
return clib_error_return (0, "parse error: '%U'",
format_unformat_error, line_input);
}
}
a->is_en = is_en;
return vnet_lisp_gpe_enable_disable (a);
}
VLIB_CLI_COMMAND (enable_disable_lisp_gpe_command, static) = {
.path = "lisp gpe",
.short_help = "lisp gpe [enable|disable]",
.function = lisp_gpe_enable_disable_command_fn,
};
clib_error_t *
lisp_gpe_init (vlib_main_t *vm)
{
lisp_gpe_main_t * lgm = &lisp_gpe_main;
clib_error_t * error = 0;
if ((error = vlib_call_init_function (vm, ip_main_init)))
return error;
if ((error = vlib_call_init_function (vm, ip4_lookup_init)))
return error;
lgm->vnet_main = vnet_get_main();
lgm->vlib_main = vm;
lgm->im4 = &ip4_main;
lgm->im6 = &ip6_main;
lgm->lm4 = &ip4_main.lookup_main;
lgm->lm6 = &ip6_main.lookup_main;
lgm->ip4_lookup_next_lgpe_ip4_lookup = ~0;
lgm->ip6_lookup_next_lgpe_ip6_lookup = ~0;
mhash_init (&lgm->lisp_gpe_tunnel_by_key, sizeof(uword),
sizeof(lisp_gpe_tunnel_key_t));
udp_register_dst_port (vm, UDP_DST_PORT_lisp_gpe,
lisp_gpe_ip4_input_node.index, 1 /* is_ip4 */);
udp_register_dst_port (vm, UDP_DST_PORT_lisp_gpe6,
lisp_gpe_ip6_input_node.index, 0 /* is_ip4 */);
return 0;
}
VLIB_INIT_FUNCTION(lisp_gpe_init);
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