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6f5cde1affe8f18126baea9776f9f5998f1f9227
lcpng/lcpng_nl_sync.c
Pim van Pelt cb78074e46 Fix logline tag
2024-03-23 10:04:10 +01:00

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/* Hey Emacs use -*- mode: C -*- */
/*
* Copyright 2021 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 <sys/socket.h>
#include <linux/if.h>
#include <linux/mpls.h>
#include <vnet/vnet.h>
#include <vnet/plugin/plugin.h>
#include <vppinfra/linux/netns.h>
#include <linux/if_ether.h>
#include <plugins/lcpng/lcpng_interface.h>
#include <plugins/lcpng/lcpng_netlink.h>
#include <vnet/devices/tap/tap.h>
#include <vnet/fib/fib_table.h>
#include <vnet/mfib/mfib_table.h>
#include <vnet/ip/ip6_ll_table.h>
#include <vnet/ip-neighbor/ip_neighbor.h>
#include <vnet/ip/ip6_link.h>
#ifndef NUD_VALID
#define NUD_VALID \
(NUD_PERMANENT | NUD_NOARP | NUD_REACHABLE | NUD_PROBE | NUD_STALE | \
NUD_DELAY)
#endif
/*
* Map of supported route types. Some types are omitted:
* RTN_LOCAL - interface address addition creates these automatically
* RTN_BROADCAST - same as RTN_LOCAL
* RTN_UNSPEC, RTN_ANYCAST, RTN_THROW, RTN_NAT, RTN_XRESOLVE -
* There's not a VPP equivalent for these currently.
*/
const static u8 lcp_nl_route_type_valid[__RTN_MAX] = {
[RTN_UNICAST] = 1, [RTN_MULTICAST] = 1, [RTN_BLACKHOLE] = 1,
[RTN_UNREACHABLE] = 1, [RTN_PROHIBIT] = 1,
};
/* Map of fib entry flags by route type */
const static fib_entry_flag_t lcp_nl_route_type_feflags[__RTN_MAX] = {
[RTN_LOCAL] = FIB_ENTRY_FLAG_LOCAL | FIB_ENTRY_FLAG_CONNECTED,
[RTN_BROADCAST] = FIB_ENTRY_FLAG_DROP | FIB_ENTRY_FLAG_LOOSE_URPF_EXEMPT,
[RTN_BLACKHOLE] = FIB_ENTRY_FLAG_DROP,
};
/* Map of fib route path flags by route type */
const static fib_route_path_flags_t lcp_nl_route_type_frpflags[__RTN_MAX] = {
[RTN_UNREACHABLE] = FIB_ROUTE_PATH_ICMP_UNREACH,
[RTN_PROHIBIT] = FIB_ROUTE_PATH_ICMP_PROHIBIT,
[RTN_BLACKHOLE] = FIB_ROUTE_PATH_DROP,
};
const static fib_prefix_t pfx_all1s = {
.fp_addr = {
.ip4 = {
.as_u32 = 0xffffffff,
}
},
.fp_proto = FIB_PROTOCOL_IP4,
.fp_len = 32,
};
const static mfib_prefix_t ip4_specials[] = {
/* ALL prefixes are in network order */
{
/* (*,224.0.0.0)/24 - all local subnet */
.fp_grp_addr = {
.ip4.data_u32 = 0x000000e0,
},
.fp_len = 24,
.fp_proto = FIB_PROTOCOL_IP4,
},
};
const static mfib_prefix_t ip6_specials[] = {
/* ALL prefixes are in network order */
{
/* (*,ff00::)/8 - all local subnet */
.fp_grp_addr = {
.ip6.as_u64[0] = 0x00000000000000ff,
},
.fp_len = 8,
.fp_proto = FIB_PROTOCOL_IP6,
},
};
static void
lcp_nl_mk_ip_addr (const struct nl_addr *rna, ip_address_t *ia)
{
ip_address_reset (ia);
ip_address_set (ia, nl_addr_get_binary_addr (rna),
nl_addr_get_family (rna) == AF_INET6 ? AF_IP6 : AF_IP4);
}
static void
lcp_nl_mk_mac_addr (const struct nl_addr *rna, mac_address_t *mac)
{
mac_address_from_bytes (mac, nl_addr_get_binary_addr (rna));
}
static int
vnet_sw_interface_subid_exists (vnet_main_t *vnm, u32 sw_if_index, u32 id)
{
u64 sup_and_sub_key = ((u64) (sw_if_index) << 32) | (u64) id;
vnet_interface_main_t *im = &vnm->interface_main;
uword *p;
p = hash_get_mem (im->sw_if_index_by_sup_and_sub, &sup_and_sub_key);
if (p)
return 1;
return 0;
}
static int
vnet_sw_interface_get_available_subid (vnet_main_t *vnm, u32 sw_if_index,
u32 *id)
{
u32 i;
for (i = 1; i < 4096; i++)
{
if (!vnet_sw_interface_subid_exists (vnm, sw_if_index, i))
{
*id = i;
return 0;
}
}
*id = -1;
return 1;
}
static fib_protocol_t
lcp_nl_proto_k2f (uint32_t k)
{
switch (k)
{
case AF_INET6:
return FIB_PROTOCOL_IP6;
case AF_INET:
return FIB_PROTOCOL_IP4;
case AF_MPLS:
return FIB_PROTOCOL_MPLS;
default:
ASSERT (0);
return FIB_PROTOCOL_NONE;
}
}
static fib_protocol_t
lcp_nl_mk_addr46 (const struct nl_addr *rna, ip46_address_t *ia)
{
fib_protocol_t fproto;
fproto = lcp_nl_proto_k2f (nl_addr_get_family (rna));
ASSERT (FIB_PROTOCOL_MPLS != fproto);
ip46_address_reset (ia);
if (FIB_PROTOCOL_IP4 == fproto)
memcpy (&ia->ip4, nl_addr_get_binary_addr (rna), nl_addr_get_len (rna));
else
memcpy (&ia->ip6, nl_addr_get_binary_addr (rna), nl_addr_get_len (rna));
return (fproto);
}
static void
lcp_nl_mk_route_prefix (struct rtnl_route *r, fib_prefix_t *p)
{
const struct nl_addr *addr = rtnl_route_get_dst (r);
u32 *baddr = nl_addr_get_binary_addr (addr);
u32 blen = nl_addr_get_len (addr);
ip46_address_t *paddr = &p->fp_addr;
u32 entry;
ip46_address_reset (paddr);
p->fp_proto = lcp_nl_proto_k2f (nl_addr_get_family (addr));
switch (p->fp_proto)
{
case FIB_PROTOCOL_MPLS:
entry = ntohl (*baddr);
p->fp_label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
p->fp_len = 21;
p->fp_eos = MPLS_NON_EOS;
return;
case FIB_PROTOCOL_IP4:
memcpy (&paddr->ip4, baddr, blen);
break;
case FIB_PROTOCOL_IP6:
memcpy (&paddr->ip6, baddr, blen);
break;
}
p->fp_len = nl_addr_get_prefixlen (addr);
}
static void
lcp_nl_mk_route_mprefix (struct rtnl_route *r, mfib_prefix_t *p)
{
const struct nl_addr *addr;
addr = rtnl_route_get_dst (r);
p->fp_len = nl_addr_get_prefixlen (addr);
p->fp_proto = lcp_nl_mk_addr46 (addr, &p->fp_grp_addr);
addr = rtnl_route_get_src (r);
if (addr)
p->fp_proto = lcp_nl_mk_addr46 (addr, &p->fp_src_addr);
}
static inline fib_source_t
lcp_nl_proto_fib_source (u8 rt_proto)
{
lcp_nl_main_t *nlm = &lcp_nl_main;
/* See /etc/iproute2/rt_protos for the list */
return (rt_proto <= RTPROT_STATIC) ? nlm->fib_src : nlm->fib_src_dynamic;
}
static fib_entry_flag_t
lcp_nl_mk_route_entry_flags (uint8_t rtype, int table_id, uint8_t rproto)
{
fib_entry_flag_t fef = FIB_ENTRY_FLAG_NONE;
fef |= lcp_nl_route_type_feflags[rtype];
if ((rproto == RTPROT_KERNEL) || PREDICT_FALSE (255 == table_id))
/* kernel proto is interface prefixes, 255 is linux's 'local' table */
fef |= FIB_ENTRY_FLAG_ATTACHED | FIB_ENTRY_FLAG_CONNECTED;
return (fef);
}
static int
lcp_router_mpls_nladdr_to_path (fib_route_path_t *path, struct nl_addr *addr)
{
if (!addr)
return 0;
struct mpls_label *stack = nl_addr_get_binary_addr (addr);
u32 entry, label;
u8 exp, ttl;
int label_count = 0;
while (1)
{
entry = ntohl (stack[label_count++].entry);
label = (entry & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT;
exp = (entry & MPLS_LS_TC_MASK) >> MPLS_LS_TC_SHIFT;
ttl = (entry & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT;
fib_mpls_label_t fml = {
.fml_value = label,
.fml_exp = exp,
.fml_ttl = ttl,
};
vec_add1 (path->frp_label_stack, fml);
if (entry & MPLS_LS_S_MASK)
break;
}
return label_count;
}
static void
lcp_nl_route_path_parse (struct rtnl_nexthop *rnh, void *arg)
{
lcp_nl_route_path_parse_t *ctx = arg;
fib_route_path_t *path;
lcp_itf_pair_t *lip;
fib_protocol_t fproto;
struct nl_addr *addr;
int label_count = 0;
/* We do not log a warning/error here, because some routes (like
* blackhole/unreach) don't have an interface associated with them.
*/
if (!(lip = lcp_itf_pair_get (
lcp_itf_pair_find_by_vif (rtnl_route_nh_get_ifindex (rnh)))))
{
return;
}
vec_add2 (ctx->paths, path, 1);
path->frp_flags = FIB_ROUTE_PATH_FLAG_NONE | ctx->type_flags;
path->frp_sw_if_index = lip->lip_phy_sw_if_index;
path->frp_preference = ctx->preference;
/*
* FIB Path Weight of 0 is meaningless and replaced with 1 further along.
* See fib_path_create. fib_path_cmp_w_route_path would fail to match
* such a fib_route_path_t with any fib_path_t, because a fib_path_t's
* fp_weight can never be 0.
*/
path->frp_weight = clib_max (1, rtnl_route_nh_get_weight (rnh));
addr = rtnl_route_nh_get_gateway (rnh);
if (!addr)
addr = rtnl_route_nh_get_via (rnh);
if (addr)
fproto = lcp_nl_mk_addr46 (addr, &path->frp_addr);
else
fproto = ctx->route_proto;
path->frp_proto = fib_proto_to_dpo (fproto);
if (ctx->route_proto == FIB_PROTOCOL_MPLS)
{
addr = rtnl_route_nh_get_newdst (rnh);
label_count = lcp_router_mpls_nladdr_to_path (path, addr);
if (label_count)
{
LCP_NL_DBG ("router_path_parse: is label swap to %u",
path->frp_label_stack[0].fml_value);
}
else
{
fib_mpls_label_t fml = {
.fml_value = MPLS_LABEL_POP,
};
vec_add1 (path->frp_label_stack, fml);
LCP_NL_DBG ("router_path_parse: is label pop");
}
}
#ifdef NL_CAPABILITY_VERSION_3_6_0
addr = rtnl_route_nh_get_encap_mpls_dst (rnh);
label_count = lcp_router_mpls_nladdr_to_path (path, addr);
if (label_count)
LCP_NL_DBG ("router_path_parse: has encap mpls, %d labels", label_count);
#endif
if (ctx->is_mcast)
path->frp_mitf_flags = MFIB_ITF_FLAG_FORWARD;
LCP_NL_DBG ("route_path_parse: path %U", format_fib_route_path, path);
}
/*
* blackhole, unreachable, prohibit will not have a next hop in an
* RTM_NEWROUTE. Add a path for them.
*/
static void
lcp_nl_route_path_add_special (struct rtnl_route *rr,
lcp_nl_route_path_parse_t *ctx)
{
fib_route_path_t *path;
if (rtnl_route_get_type (rr) < RTN_BLACKHOLE)
return;
/* if it already has a path, it does not need us to add one */
if (vec_len (ctx->paths) > 0)
return;
vec_add2 (ctx->paths, path, 1);
path->frp_flags = FIB_ROUTE_PATH_FLAG_NONE | ctx->type_flags;
path->frp_sw_if_index = ~0;
path->frp_proto = fib_proto_to_dpo (ctx->route_proto);
path->frp_preference = ctx->preference;
LCP_NL_DBG ("route_path_add_special: path %U", format_fib_route_path, path);
}
static lcp_nl_table_t *
lcp_nl_table_find (uint32_t id, fib_protocol_t fproto)
{
lcp_nl_main_t *nlm = &lcp_nl_main;
uword *p;
p = hash_get (nlm->table_db[fproto], id);
if (p)
return pool_elt_at_index (nlm->table_pool, p[0]);
return (NULL);
}
static uint32_t
lcp_nl_table_k2f (uint32_t k)
{
// the kernel's table ID 255 is the default table
if (k == 255 || k == 254)
return 0;
return k;
}
static lcp_nl_table_t *
lcp_nl_table_add_or_lock (uint32_t id, fib_protocol_t fproto)
{
lcp_nl_table_t *nlt;
lcp_nl_main_t *nlm = &lcp_nl_main;
id = lcp_nl_table_k2f (id);
nlt = lcp_nl_table_find (id, fproto);
if (NULL == nlt)
{
pool_get_zero (nlm->table_pool, nlt);
nlt->nlt_id = id;
nlt->nlt_proto = fproto;
nlt->nlt_fib_index = fib_table_find_or_create_and_lock (
nlt->nlt_proto, nlt->nlt_id, nlm->fib_src);
nlt->nlt_mfib_index = mfib_table_find_or_create_and_lock (
nlt->nlt_proto, nlt->nlt_id, MFIB_SOURCE_PLUGIN_LOW);
hash_set (nlm->table_db[fproto], nlt->nlt_id, nlt - nlm->table_pool);
if (FIB_PROTOCOL_IP4 == fproto)
{
/* Set the all 1s address in this table to punt */
fib_table_entry_special_add (nlt->nlt_fib_index, &pfx_all1s,
nlm->fib_src, FIB_ENTRY_FLAG_LOCAL);
const fib_route_path_t path = {
.frp_proto = DPO_PROTO_IP4,
.frp_addr = zero_addr,
.frp_sw_if_index = ~0,
.frp_fib_index = ~0,
.frp_weight = 1,
.frp_mitf_flags = MFIB_ITF_FLAG_FORWARD,
.frp_flags = FIB_ROUTE_PATH_LOCAL,
};
int ii;
for (ii = 0; ii < ARRAY_LEN (ip4_specials); ii++)
{
mfib_table_entry_path_update (
nlt->nlt_mfib_index, &ip4_specials[ii], MFIB_SOURCE_PLUGIN_LOW,
MFIB_ENTRY_FLAG_NONE, &path);
}
}
else if (FIB_PROTOCOL_IP6 == fproto)
{
const fib_route_path_t path = {
.frp_proto = DPO_PROTO_IP6,
.frp_addr = zero_addr,
.frp_sw_if_index = ~0,
.frp_fib_index = ~0,
.frp_weight = 1,
.frp_mitf_flags = MFIB_ITF_FLAG_FORWARD,
.frp_flags = FIB_ROUTE_PATH_LOCAL,
};
int ii;
for (ii = 0; ii < ARRAY_LEN (ip6_specials); ii++)
{
mfib_table_entry_path_update (
nlt->nlt_mfib_index, &ip6_specials[ii], MFIB_SOURCE_PLUGIN_LOW,
MFIB_ENTRY_FLAG_NONE, &path);
}
}
}
nlt->nlt_refs++;
return (nlt);
}
static void
lcp_nl_table_unlock (lcp_nl_table_t *nlt)
{
lcp_nl_main_t *nlm = &lcp_nl_main;
nlt->nlt_refs--;
if (0 == nlt->nlt_refs)
{
if (FIB_PROTOCOL_IP4 == nlt->nlt_proto)
{
/* Remove the all 1s address in this table to punt */
fib_table_entry_special_remove (nlt->nlt_fib_index, &pfx_all1s,
nlm->fib_src);
}
fib_table_unlock (nlt->nlt_fib_index, nlt->nlt_proto, nlm->fib_src);
hash_unset (nlm->table_db[nlt->nlt_proto], nlt->nlt_id);
pool_put (nlm->table_pool, nlt);
}
}
void
lcp_nl_route_del (struct rtnl_route *rr)
{
uint32_t table_id;
fib_prefix_t pfx;
lcp_nl_table_t *nlt;
uint8_t rtype, rproto;
LCP_NL_DBG ("route_del: netlink %U", format_nl_object, rr);
rtype = rtnl_route_get_type (rr);
table_id = rtnl_route_get_table (rr);
rproto = rtnl_route_get_protocol (rr);
/* skip unsupported route types and local table */
if (!lcp_nl_route_type_valid[rtype] || (table_id == 255))
return;
lcp_nl_mk_route_prefix (rr, &pfx);
nlt = lcp_nl_table_find (lcp_nl_table_k2f (table_id), pfx.fp_proto);
if (NULL == nlt)
{
return;
}
lcp_nl_route_path_parse_t np = {
.route_proto = pfx.fp_proto,
.type_flags = lcp_nl_route_type_frpflags[rtype],
};
rtnl_route_foreach_nexthop (rr, lcp_nl_route_path_parse, &np);
lcp_nl_route_path_add_special (rr, &np);
if (0 != vec_len (np.paths))
{
fib_source_t fib_src = lcp_nl_proto_fib_source (rproto);
fib_entry_flag_t entry_flags;
entry_flags = lcp_nl_mk_route_entry_flags (rtype, table_id, rproto);
LCP_NL_DBG ("route_del: table %d prefix %U flags %U",
rtnl_route_get_table (rr), format_fib_prefix, &pfx,
format_fib_entry_flags, entry_flags);
switch (pfx.fp_proto)
{
case FIB_PROTOCOL_IP6:
fib_table_entry_delete (nlt->nlt_fib_index, &pfx, fib_src);
break;
case FIB_PROTOCOL_MPLS:
fib_table_entry_path_remove2 (nlt->nlt_fib_index, &pfx, fib_src,
np.paths);
/* delete the EOS route in addition to NEOS - fallthrough */
pfx.fp_eos = MPLS_EOS;
default:
fib_table_entry_path_remove2 (nlt->nlt_fib_index, &pfx, fib_src,
np.paths);
}
}
vec_free (np.paths);
lcp_nl_table_unlock (nlt);
}
static fib_route_path_t *
lcp_router_fib_route_path_dup (fib_route_path_t *old)
{
int idx;
fib_route_path_t *p;
fib_route_path_t *new = vec_dup (old);
if (!new)
return NULL;
for (idx = 0; idx < vec_len (new); idx++)
{
p = &new[idx];
if (p->frp_label_stack)
p->frp_label_stack = vec_dup (p->frp_label_stack);
}
return new;
}
void
lcp_nl_route_add (struct rtnl_route *rr, int is_replace)
{
fib_entry_flag_t entry_flags;
uint32_t table_id;
fib_prefix_t pfx;
lcp_nl_table_t *nlt;
uint8_t rtype, rproto;
LCP_NL_DBG ("route_add: netlink %U %s", format_nl_object, rr,
is_replace ? "replace" : "");
rtype = rtnl_route_get_type (rr);
table_id = rtnl_route_get_table (rr);
rproto = rtnl_route_get_protocol (rr);
/* skip unsupported route types and local table */
if (!lcp_nl_route_type_valid[rtype] || (table_id == 255))
return;
lcp_nl_mk_route_prefix (rr, &pfx);
entry_flags = lcp_nl_mk_route_entry_flags (rtype, table_id, rproto);
nlt = lcp_nl_table_add_or_lock (table_id, pfx.fp_proto);
/* Skip any kernel routes and IPv6 LL or multicast routes */
if (rproto == RTPROT_KERNEL ||
(FIB_PROTOCOL_IP6 == pfx.fp_proto &&
(ip6_address_is_multicast (&pfx.fp_addr.ip6) ||
ip6_address_is_link_local_unicast (&pfx.fp_addr.ip6))))
{
LCP_NL_DBG ("route_add: skip linklocal table %d prefix %U flags %U",
rtnl_route_get_table (rr), format_fib_prefix, &pfx,
format_fib_entry_flags, entry_flags);
return;
}
lcp_nl_route_path_parse_t np = {
.route_proto = pfx.fp_proto,
.is_mcast = (rtype == RTN_MULTICAST),
.type_flags = lcp_nl_route_type_frpflags[rtype],
.preference = (u8) rtnl_route_get_priority (rr),
};
rtnl_route_foreach_nexthop (rr, lcp_nl_route_path_parse, &np);
lcp_nl_route_path_add_special (rr, &np);
if (0 != vec_len (np.paths))
{
if (rtype == RTN_MULTICAST)
{
/* it's not clear to me how linux expresses the RPF paramters
* so we'll allow from all interfaces and hope for the best */
mfib_prefix_t mpfx = {};
lcp_nl_mk_route_mprefix (rr, &mpfx);
LCP_NL_DBG ("route_add: mcast table %d prefix %U flags %U",
rtnl_route_get_table (rr), format_mfib_prefix, &mpfx,
format_fib_entry_flags, entry_flags);
mfib_table_entry_update (nlt->nlt_mfib_index, &mpfx,
MFIB_SOURCE_PLUGIN_LOW, MFIB_RPF_ID_NONE,
MFIB_ENTRY_FLAG_ACCEPT_ALL_ITF);
mfib_table_entry_paths_update (nlt->nlt_mfib_index, &mpfx,
MFIB_SOURCE_PLUGIN_LOW,
MFIB_ENTRY_FLAG_NONE, np.paths);
}
else
{
fib_source_t fib_src;
const fib_route_path_t *rpath;
vec_foreach (rpath, np.paths)
{
if (fib_route_path_is_attached (rpath))
{
entry_flags |= FIB_ENTRY_FLAG_ATTACHED;
break;
}
}
fib_src = lcp_nl_proto_fib_source (rproto);
LCP_NL_DBG ("route_add: table %d prefix %U flags %U",
rtnl_route_get_table (rr), format_fib_prefix, &pfx,
format_fib_entry_flags, entry_flags);
if (pfx.fp_proto == FIB_PROTOCOL_MPLS)
{
/* in order to avoid double-frees, we duplicate the paths. */
fib_route_path_t *pathdup =
lcp_router_fib_route_path_dup (np.paths);
if (is_replace)
fib_table_entry_update (nlt->nlt_fib_index, &pfx, fib_src,
entry_flags, pathdup);
else
fib_table_entry_path_add2 (nlt->nlt_fib_index, &pfx, fib_src,
entry_flags, pathdup);
vec_free (pathdup);
/* install EOS route in addition to NEOS */
pfx.fp_eos = MPLS_EOS;
pfx.fp_payload_proto = np.paths[0].frp_proto;
}
if (is_replace)
fib_table_entry_update (nlt->nlt_fib_index, &pfx, fib_src,
entry_flags, np.paths);
else
fib_table_entry_path_add2 (nlt->nlt_fib_index, &pfx, fib_src,
entry_flags, np.paths);
}
}
else
LCP_NL_WARN ("route_add: No paths table %d prefix %U flags %U netlink %U",
rtnl_route_get_table (rr), format_fib_prefix, &pfx,
format_fib_entry_flags, entry_flags, format_nl_object, rr);
vec_free (np.paths);
}
// Returns the LIP for a newly created sub-int pair, or
// NULL in case no sub-int could be created.
static lcp_itf_pair_t *
lcp_nl_link_add_vlan (struct rtnl_link *rl)
{
vnet_main_t *vnm = vnet_get_main ();
int parent_idx, idx;
lcp_itf_pair_t *parent_lip, *phy_lip;
vnet_sw_interface_t *parent_sw;
int vlan;
u32 proto;
u32 subid;
u32 inner_vlan, outer_vlan, flags;
u32 phy_sw_if_index, host_sw_if_index;
lcp_main_t *lcpm = &lcp_main;
u8 old_lcp_auto_subint;
if (!rtnl_link_is_vlan (rl))
return NULL;
idx = rtnl_link_get_ifindex (rl);
parent_idx = rtnl_link_get_link (rl);
vlan = rtnl_link_vlan_get_id (rl);
proto = rtnl_link_vlan_get_protocol (rl);
/* Get the LIP of the parent, can be a phy Te3/0/0 or a subint Te3/0/0.1000
*/
if (!(parent_lip = lcp_itf_pair_get (lcp_itf_pair_find_by_vif (parent_idx))))
{
LCP_NL_WARN ("link_add_vlan: No LIP for parent of %U", format_nl_object,
rl);
return NULL;
}
parent_sw = vnet_get_sw_interface (vnm, parent_lip->lip_phy_sw_if_index);
if (!parent_sw)
{
LCP_NL_ERROR ("link_add_vlan: Cannot get parent of %U",
format_lcp_itf_pair, parent_lip);
return NULL;
}
/* Get the LIP of the phy, ie "phy TenGigabitEthernet3/0/0 host tap1 host-if
* e0" */
phy_lip =
lcp_itf_pair_get (lcp_itf_pair_find_by_phy (parent_sw->sup_sw_if_index));
if (vnet_sw_interface_is_sub (vnm, parent_lip->lip_phy_sw_if_index))
{
// QinQ or QinAD
inner_vlan = vlan;
outer_vlan = parent_sw->sub.eth.outer_vlan_id;
if (ntohs (proto) == ETH_P_8021AD)
{
LCP_NL_ERROR ("link_add_vlan: Cannot create inner dot1ad: %U",
format_nl_object, rl);
return NULL;
}
}
else
{
inner_vlan = 0;
outer_vlan = vlan;
}
// Flags: no_tags(1), one_tag(2), two_tags(4), dot1ad(8), exact_match(16) see
// vnet/interface.h
flags = 16; // exact-match
if ((parent_sw->sub.eth.flags.dot1ad) || (ntohs (proto) == ETH_P_8021AD))
flags += 8; // dot1ad
if (inner_vlan)
flags += 4; // two_tags
else
flags += 2; // one_tag
/* Create sub on the phy and on the tap, but avoid triggering sub-int
* autocreation if it's enabled.
*/
old_lcp_auto_subint = lcpm->lcp_auto_subint;
lcpm->lcp_auto_subint = 0;
/* Generate a subid, take the first available one */
if (vnet_sw_interface_get_available_subid (vnm, parent_sw->sup_sw_if_index,
&subid))
{
LCP_NL_ERROR ("link_add_vlan: Cannot find available subid on phy %U",
format_vnet_sw_if_index_name, vnm,
parent_sw->sup_sw_if_index);
lcpm->lcp_auto_subint = old_lcp_auto_subint;
return NULL;
}
LCP_NL_INFO (
"link_add_vlan: Creating subid %u outer %u inner %u flags %u on phy %U",
subid, outer_vlan, inner_vlan, flags, format_vnet_sw_if_index_name, vnm,
parent_sw->sup_sw_if_index);
if (vnet_create_sub_interface (parent_sw->sup_sw_if_index, subid, flags,
inner_vlan, outer_vlan, &phy_sw_if_index))
{
LCP_NL_ERROR ("link_add_vlan: Cannot create sub-int on phy %U flags %u "
"inner-dot1q %u dot1%s %u",
format_vnet_sw_if_index_name, vnm,
parent_sw->sup_sw_if_index, flags, inner_vlan,
parent_sw->sub.eth.flags.dot1ad ? "ad" : "q", outer_vlan);
lcpm->lcp_auto_subint = old_lcp_auto_subint;
return NULL;
}
/* Try to use the same subid on the TAP, generate a unique one otherwise. */
if (vnet_sw_interface_subid_exists (vnm, phy_lip->lip_host_sw_if_index,
subid) &&
vnet_sw_interface_get_available_subid (
vnm, phy_lip->lip_host_sw_if_index, &subid))
{
LCP_NL_ERROR ("link_add_vlan: Cannot find available subid on host %U",
format_vnet_sw_if_index_name, vnm,
phy_lip->lip_host_sw_if_index);
lcpm->lcp_auto_subint = old_lcp_auto_subint;
return NULL;
}
LCP_NL_INFO (
"link_add_vlan: creating subid %u outer %u inner %u flags %u on "
"host %U phy %U",
subid, outer_vlan, inner_vlan, flags, format_vnet_sw_if_index_name, vnm,
parent_lip->lip_host_sw_if_index, format_vnet_sw_if_index_name, vnm,
phy_lip->lip_host_sw_if_index);
if (vnet_create_sub_interface (phy_lip->lip_host_sw_if_index, subid, flags,
inner_vlan, outer_vlan, &host_sw_if_index))
{
LCP_NL_ERROR ("link_add_vlan: Cannot create sub-int on host %U flags %u "
"inner-dot1q %u dot1%s %u",
format_vnet_sw_if_index_name, vnm,
phy_lip->lip_host_sw_if_index, flags, inner_vlan,
parent_sw->sub.eth.flags.dot1ad ? "ad" : "q", outer_vlan);
lcpm->lcp_auto_subint = old_lcp_auto_subint;
return NULL;
}
// Always keep sub-int on the TAP up
vnet_sw_interface_admin_up (vnm, host_sw_if_index);
LCP_NL_NOTICE (
"link_add_vlan: Creating LIP for host %U phy %U name %s idx %d",
format_vnet_sw_if_index_name, vnm, host_sw_if_index,
format_vnet_sw_if_index_name, vnm, phy_sw_if_index,
rtnl_link_get_name (rl), idx);
lcpm->lcp_auto_subint = old_lcp_auto_subint;
u8 *if_namev = 0;
char *if_name;
if_name = rtnl_link_get_name (rl);
vec_validate_init_c_string (if_namev, if_name, strnlen (if_name, IFNAMSIZ));
lcp_itf_pair_add (host_sw_if_index, phy_sw_if_index, if_namev, idx,
phy_lip->lip_host_type, phy_lip->lip_namespace);
vec_free (if_namev);
// If all went well, we just created a new LIP and added it to the index --
// so return that new (sub-interface) LIP to the caller.
return lcp_itf_pair_get (lcp_itf_pair_find_by_phy (phy_sw_if_index));
}
void
lcp_nl_link_del (struct rtnl_link *rl)
{
lcp_itf_pair_t *lip;
LCP_NL_DBG ("link_del: netlink %U", format_nl_object, rl);
if (!(lip = lcp_itf_pair_get (
lcp_itf_pair_find_by_vif (rtnl_link_get_ifindex (rl)))))
{
LCP_NL_WARN ("link_del: No LIP for %U ", format_nl_object, rl);
return;
}
LCP_NL_NOTICE ("link_del: Removing %U", format_lcp_itf_pair, lip);
lcp_itf_pair_delete (lip->lip_phy_sw_if_index);
if (rtnl_link_is_vlan (rl))
{
LCP_NL_NOTICE ("link_del: Removing subint %U",
format_vnet_sw_if_index_name, vnet_get_main (),
lip->lip_phy_sw_if_index);
vnet_delete_sub_interface (lip->lip_phy_sw_if_index);
vnet_delete_sub_interface (lip->lip_host_sw_if_index);
}
return;
}
static void
lcp_nl_link_set_mtu (struct rtnl_link *rl, lcp_itf_pair_t *lip)
{
vnet_main_t *vnm = vnet_get_main ();
u32 mtu;
vnet_sw_interface_t *sw;
vnet_hw_interface_t *hw;
mtu = rtnl_link_get_mtu (rl);
if (!mtu)
return;
sw = vnet_get_sw_interface (vnm, lip->lip_phy_sw_if_index);
hw = vnet_get_sup_hw_interface (vnm, lip->lip_phy_sw_if_index);
if (!sw || !hw)
return;
/* Set the MTU on the TAP and sw */
vnet_sw_interface_set_mtu (vnm, lip->lip_host_sw_if_index, mtu);
vnet_sw_interface_set_mtu (vnm, lip->lip_phy_sw_if_index, mtu);
}
static void
lcp_nl_link_set_lladdr (struct rtnl_link *rl, lcp_itf_pair_t *lip)
{
vnet_main_t *vnm = vnet_get_main ();
struct nl_addr *mac_addr;
vnet_sw_interface_t *sw;
vnet_hw_interface_t *hw;
void *mac_addr_bytes;
mac_addr = rtnl_link_get_addr (rl);
if (!mac_addr || (nl_addr_get_family (mac_addr) != AF_LLC))
return;
sw = vnet_get_sw_interface (vnm, lip->lip_phy_sw_if_index);
hw = vnet_get_sup_hw_interface (vnm, lip->lip_phy_sw_if_index);
if (!sw || !hw)
return;
/* can only change address on hw interface */
if (sw->sw_if_index != sw->sup_sw_if_index)
return;
/* can only change if there's an address present */
if (!vec_len (hw->hw_address))
return;
mac_addr_bytes = nl_addr_get_binary_addr (mac_addr);
if (clib_memcmp (mac_addr_bytes, hw->hw_address, nl_addr_get_len (mac_addr)))
vnet_hw_interface_change_mac_address (vnm, hw->hw_if_index,
mac_addr_bytes);
/* mcast adjacencies need to be updated */
vnet_update_adjacency_for_sw_interface (vnm, lip->lip_phy_sw_if_index,
lip->lip_phy_adjs.adj_index[AF_IP4]);
vnet_update_adjacency_for_sw_interface (vnm, lip->lip_phy_sw_if_index,
lip->lip_phy_adjs.adj_index[AF_IP6]);
}
void
lcp_nl_link_add (struct rtnl_link *rl, void *ctx)
{
vnet_main_t *vnm = vnet_get_main ();
lcp_itf_pair_t *lip;
int admin_state;
LCP_NL_DBG ("link_add: netlink %U", format_nl_object, rl);
/* For NEWLINK messages, if this interface doesn't have a LIP, it
* may be a request to create a sub-int; so we call add_vlan()
* to create it and pass its new LIP so we can finish the request.
*/
if (!(lip = lcp_itf_pair_get (
lcp_itf_pair_find_by_vif (rtnl_link_get_ifindex (rl)))))
{
if (!(lip = lcp_nl_link_add_vlan (rl)))
return;
}
admin_state = (IFF_UP & rtnl_link_get_flags (rl));
// Note: Cannot use lcp_itf_set_link_state() here because it creates a loop
// by sending a netlink message.
if (admin_state)
{
vnet_sw_interface_admin_up (vnm, lip->lip_phy_sw_if_index);
}
else
{
vnet_sw_interface_admin_down (vnm, lip->lip_phy_sw_if_index);
}
lcp_nl_link_set_mtu (rl, lip);
lcp_nl_link_set_lladdr (rl, lip);
LCP_NL_INFO ("link_add: %U admin %s", format_lcp_itf_pair, lip,
admin_state ? "up" : "down");
return;
}
static void
lcp_nl_ip4_mroutes_add_del (u32 sw_if_index, u8 is_add)
{
const fib_route_path_t path = {
.frp_proto = DPO_PROTO_IP4,
.frp_addr = zero_addr,
.frp_sw_if_index = sw_if_index,
.frp_fib_index = ~0,
.frp_weight = 1,
.frp_mitf_flags = MFIB_ITF_FLAG_ACCEPT,
};
u32 mfib_index;
int ii;
mfib_index =
mfib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index);
for (ii = 0; ii < ARRAY_LEN (ip4_specials); ii++)
{
if (is_add)
{
mfib_table_entry_path_update (mfib_index, &ip4_specials[ii],
MFIB_SOURCE_PLUGIN_LOW,
MFIB_ENTRY_FLAG_NONE, &path);
}
else
{
mfib_table_entry_path_remove (mfib_index, &ip4_specials[ii],
MFIB_SOURCE_PLUGIN_LOW, &path);
}
}
}
static void
lcp_nl_ip6_mroutes_add_del (u32 sw_if_index, u8 is_add)
{
const fib_route_path_t path = {
.frp_proto = DPO_PROTO_IP6,
.frp_addr = zero_addr,
.frp_sw_if_index = sw_if_index,
.frp_fib_index = ~0,
.frp_weight = 1,
.frp_mitf_flags = MFIB_ITF_FLAG_ACCEPT,
};
u32 mfib_index;
int ii;
mfib_index =
mfib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6, sw_if_index);
for (ii = 0; ii < ARRAY_LEN (ip6_specials); ii++)
{
if (is_add)
{
mfib_table_entry_path_update (mfib_index, &ip6_specials[ii],
MFIB_SOURCE_PLUGIN_LOW,
MFIB_ENTRY_FLAG_NONE, &path);
}
else
{
mfib_table_entry_path_remove (mfib_index, &ip6_specials[ii],
MFIB_SOURCE_PLUGIN_LOW, &path);
}
}
}
static void
lcp_nl_addr_add_del (struct rtnl_addr *ra, int is_del)
{
lcp_itf_pair_t *lip;
ip_address_t nh;
LCP_NL_DBG ("addr_%s: netlink %U", is_del ? "del" : "add", format_nl_object,
ra);
if (!(lip = lcp_itf_pair_get (
lcp_itf_pair_find_by_vif (rtnl_addr_get_ifindex (ra)))))
{
LCP_NL_WARN ("addr_%s: No LIP for %U ", is_del ? "del" : "add",
format_nl_object, ra);
return;
}
lcp_nl_mk_ip_addr (rtnl_addr_get_local (ra), &nh);
if (AF_IP4 == ip_addr_version (&nh))
{
ip4_add_del_interface_address (
vlib_get_main (), lip->lip_phy_sw_if_index, &ip_addr_v4 (&nh),
rtnl_addr_get_prefixlen (ra), is_del);
lcp_nl_ip4_mroutes_add_del (lip->lip_phy_sw_if_index, !is_del);
}
else if (AF_IP6 == ip_addr_version (&nh))
{
if (ip6_address_is_link_local_unicast (&ip_addr_v6 (&nh)))
if (is_del)
ip6_link_disable (lip->lip_phy_sw_if_index);
else
{
ip6_link_enable (lip->lip_phy_sw_if_index, NULL);
ip6_link_set_local_address (lip->lip_phy_sw_if_index,
&ip_addr_v6 (&nh));
}
else
ip6_add_del_interface_address (
vlib_get_main (), lip->lip_phy_sw_if_index, &ip_addr_v6 (&nh),
rtnl_addr_get_prefixlen (ra), is_del);
lcp_nl_ip6_mroutes_add_del (lip->lip_phy_sw_if_index, !is_del);
}
LCP_NL_NOTICE (
"addr_%s %U/%d iface %U", is_del ? "del: Deleted" : "add: Added",
format_ip_address, &nh, rtnl_addr_get_prefixlen (ra),
format_vnet_sw_if_index_name, vnet_get_main (), lip->lip_phy_sw_if_index);
}
void
lcp_nl_addr_add (struct rtnl_addr *ra)
{
lcp_nl_addr_add_del (ra, 0);
}
void
lcp_nl_addr_del (struct rtnl_addr *ra)
{
lcp_nl_addr_add_del (ra, 1);
}
void
lcp_nl_neigh_add (struct rtnl_neigh *rn)
{
lcp_itf_pair_t *lip;
struct nl_addr *ll;
ip_address_t nh;
int state;
struct nl_addr *rna;
LCP_NL_DBG ("neigh_add: netlink %U", format_nl_object, rn);
if (!(lip = lcp_itf_pair_get (
lcp_itf_pair_find_by_vif (rtnl_neigh_get_ifindex (rn)))))
{
LCP_NL_WARN ("neigh_add: No LIP for %U ", format_nl_object, rn);
return;
}
if (ip46_address_is_multicast (&ip_addr_46 (&nh)))
{
LCP_NL_DBG ("neigh_add: ignore multicast %U", format_nl_object, rn);
return;
}
if ((rna = rtnl_neigh_get_dst (rn)) == NULL)
{
LCP_NL_DBG ("neigh_add: ignore missing neighbor %U", format_nl_object,
rn);
return;
}
lcp_nl_mk_ip_addr (rna, &nh);
ll = rtnl_neigh_get_lladdr (rn);
state = rtnl_neigh_get_state (rn);
if (ll && (state & NUD_VALID))
{
mac_address_t mac;
ip_neighbor_flags_t flags;
int rv;
lcp_nl_mk_mac_addr (ll, &mac);
if (state & (NUD_NOARP | NUD_PERMANENT))
flags = IP_NEIGHBOR_FLAG_STATIC;
else
flags = IP_NEIGHBOR_FLAG_DYNAMIC;
rv = ip_neighbor_add (&nh, &mac, lip->lip_phy_sw_if_index, flags, NULL);
if (rv)
{
LCP_NL_ERROR ("neigh_add: Failed %U lladdr %U iface %U",
format_ip_address, &nh, format_mac_address, &mac,
format_vnet_sw_if_index_name, vnet_get_main (),
lip->lip_phy_sw_if_index);
}
else
{
LCP_NL_INFO ("neigh_add: Added %U lladdr %U iface %U",
format_ip_address, &nh, format_mac_address, &mac,
format_vnet_sw_if_index_name, vnet_get_main (),
lip->lip_phy_sw_if_index);
}
}
}
void
lcp_nl_neigh_del (struct rtnl_neigh *rn)
{
ip_address_t nh;
int rv;
struct nl_addr *rna;
LCP_NL_DBG ("neigh_del: netlink %U", format_nl_object, rn);
lcp_itf_pair_t *lip;
if (!(lip = lcp_itf_pair_get (
lcp_itf_pair_find_by_vif (rtnl_neigh_get_ifindex (rn)))))
{
LCP_NL_WARN ("neigh_del: No LIP for %U ", format_nl_object, rn);
return;
}
if (ip46_address_is_multicast (&ip_addr_46 (&nh)))
{
LCP_NL_DBG ("neigh_del: ignore multicast %U", format_nl_object, rn);
return;
}
if ((rna = rtnl_neigh_get_dst (rn)) == NULL)
{
LCP_NL_DBG ("neigh_del: ignore missing neighbor %U", format_nl_object,
rn);
return;
}
lcp_nl_mk_ip_addr (rna, &nh);
rv = ip_neighbor_del (&nh, lip->lip_phy_sw_if_index);
if (rv == 0 || rv == VNET_API_ERROR_NO_SUCH_ENTRY)
{
LCP_NL_INFO ("neigh_del: Deleted %U iface %U", format_ip_address, &nh,
format_vnet_sw_if_index_name, vnet_get_main (),
lip->lip_phy_sw_if_index);
}
else
{
LCP_NL_ERROR ("neigh_del: Failed %U iface %U", format_ip_address, &nh,
format_vnet_sw_if_index_name, vnet_get_main (),
lip->lip_phy_sw_if_index);
}
}
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