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authorNeale Ranns <nranns@cisco.com>2020-09-18 12:58:40 +0000
committerOle Tr�an <otroan@employees.org>2020-09-21 15:34:56 +0000
commit3f9fdd98463bd926fc78a2b366875c929058e2db (patch)
treea38c26372ed7b1a433afbacf05e686044f1cf583 /src/plugins/lldp/lldp_output.c
parent4b1b13315a3c532d45fb41cc3ce34a48ad72a757 (diff)
lldp: Move to plugin
Type: refactor Change-Id: Ifd770ff4850e63474bf4682ad463021b03786b4b Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/plugins/lldp/lldp_output.c')
-rw-r--r--src/plugins/lldp/lldp_output.c308
1 files changed, 308 insertions, 0 deletions
diff --git a/src/plugins/lldp/lldp_output.c b/src/plugins/lldp/lldp_output.c
new file mode 100644
index 00000000000..dc03faf4d5c
--- /dev/null
+++ b/src/plugins/lldp/lldp_output.c
@@ -0,0 +1,308 @@
+/*
+ * Copyright (c) 2011-2016 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.
+ */
+/**
+ * @file
+ * @brief LLDP packet generation implementation
+ */
+#include <lldp/lldp_node.h>
+
+static void
+lldp_build_mgmt_addr_tlv (u8 ** t0p, u8 subtype, u8 addr_len, u8 * addr,
+ u32 if_index, u8 oid_len, u8 * oid)
+{
+ lldp_tlv_t *t = (lldp_tlv_t *) * t0p;
+
+ lldp_tlv_set_code (t, LLDP_TLV_NAME (mgmt_addr));
+ t->v[0] = addr_len + 1; /* address string length */
+ t->v[1] = subtype; /* address subtype */
+ clib_memcpy_fast (&(t->v[2]), addr, addr_len); /* address */
+ t->v[addr_len + 2] = 2; /* interface numbering subtype: ifIndex */
+ t->v[addr_len + 3] = (if_index >> 24) & 0xFF; /* interface number */
+ t->v[addr_len + 4] = (if_index >> 16) & 0xFF;
+ t->v[addr_len + 5] = (if_index >> 8) & 0xFF;
+ t->v[addr_len + 6] = (if_index >> 0) & 0xFF;
+ t->v[addr_len + 7] = oid_len; /* OID string length */
+
+ if (oid_len > 0)
+ clib_memcpy_fast ((u8 *) & (t->v[addr_len + 8]), oid, oid_len);
+
+ lldp_tlv_set_length (t, addr_len + oid_len + 8);
+ *t0p += STRUCT_SIZE_OF (lldp_tlv_t, head) + addr_len + oid_len + 8;
+}
+
+static void
+lldp_add_chassis_id (const vnet_hw_interface_t * hw, u8 ** t0p)
+{
+ lldp_chassis_id_tlv_t *t = (lldp_chassis_id_tlv_t *) * t0p;
+
+ lldp_tlv_set_code ((lldp_tlv_t *) t, LLDP_TLV_NAME (chassis_id));
+ t->subtype = LLDP_CHASS_ID_SUBTYPE_NAME (mac_addr);
+
+ const size_t addr_len = 6;
+ clib_memcpy_fast (&t->id, hw->hw_address, addr_len);
+ const size_t len =
+ STRUCT_SIZE_OF (lldp_chassis_id_tlv_t, subtype) + addr_len;
+ lldp_tlv_set_length ((lldp_tlv_t *) t, len);
+ *t0p += STRUCT_SIZE_OF (lldp_tlv_t, head) + len;
+}
+
+static void
+lldp_add_port_id (const vnet_hw_interface_t * hw, u8 ** t0p)
+{
+ lldp_port_id_tlv_t *t = (lldp_port_id_tlv_t *) * t0p;
+
+ lldp_tlv_set_code ((lldp_tlv_t *) t, LLDP_TLV_NAME (port_id));
+ t->subtype = LLDP_PORT_ID_SUBTYPE_NAME (intf_name);
+
+ const size_t name_len = vec_len (hw->name);
+ clib_memcpy_fast (&t->id, hw->name, name_len);
+ const size_t len = STRUCT_SIZE_OF (lldp_port_id_tlv_t, subtype) + name_len;
+ lldp_tlv_set_length ((lldp_tlv_t *) t, len);
+ *t0p += STRUCT_SIZE_OF (lldp_tlv_t, head) + len;
+}
+
+static void
+lldp_add_ttl (const lldp_main_t * lm, u8 ** t0p, int shutdown)
+{
+ lldp_ttl_tlv_t *t = (lldp_ttl_tlv_t *) * t0p;
+ lldp_tlv_set_code ((lldp_tlv_t *) t, LLDP_TLV_NAME (ttl));
+ if (shutdown)
+ {
+ t->ttl = 0;
+ }
+ else
+ {
+ if ((size_t) lm->msg_tx_interval * lm->msg_tx_hold + 1 > (1 << 16) - 1)
+ {
+ t->ttl = htons ((1 << 16) - 1);
+ }
+ else
+ {
+ t->ttl = htons (lm->msg_tx_hold * lm->msg_tx_interval + 1);
+ }
+ }
+ const size_t len = STRUCT_SIZE_OF (lldp_ttl_tlv_t, ttl);
+ lldp_tlv_set_length ((lldp_tlv_t *) t, len);
+ *t0p += STRUCT_SIZE_OF (lldp_tlv_t, head) + len;
+}
+
+static void
+lldp_add_port_desc (const lldp_main_t * lm, lldp_intf_t * n, u8 ** t0p)
+{
+ const size_t len = vec_len (n->port_desc);
+ if (len)
+ {
+ lldp_tlv_t *t = (lldp_tlv_t *) * t0p;
+ lldp_tlv_set_code (t, LLDP_TLV_NAME (port_desc));
+ lldp_tlv_set_length (t, len);
+ clib_memcpy_fast (t->v, n->port_desc, len);
+ *t0p += STRUCT_SIZE_OF (lldp_tlv_t, head) + len;
+ }
+}
+
+static void
+lldp_add_sys_name (const lldp_main_t * lm, u8 ** t0p)
+{
+ const size_t len = vec_len (lm->sys_name);
+ if (len)
+ {
+ lldp_tlv_t *t = (lldp_tlv_t *) * t0p;
+ lldp_tlv_set_code (t, LLDP_TLV_NAME (sys_name));
+ lldp_tlv_set_length (t, len);
+ clib_memcpy_fast (t->v, lm->sys_name, len);
+ *t0p += STRUCT_SIZE_OF (lldp_tlv_t, head) + len;
+ }
+}
+
+static void
+lldp_add_mgmt_addr (const lldp_intf_t * n, const vnet_hw_interface_t * hw,
+ u8 ** t0p)
+{
+ const size_t len_ip4 = vec_len (n->mgmt_ip4);
+ const size_t len_ip6 = vec_len (n->mgmt_ip6);
+
+ if (!(len_ip4 | len_ip6))
+ {
+ /*
+ If no management address is configured, the interface port's MAC
+ address is sent in one TLV.
+ */
+
+ lldp_build_mgmt_addr_tlv (t0p, 1, /* address subtype: Ipv4 */
+ 6, /* address string length */
+ hw->hw_address, /* address */
+ hw->hw_if_index, /* if index */
+ vec_len (n->mgmt_oid), /* OID length */
+ n->mgmt_oid); /* OID */
+ return;
+ }
+
+ if (len_ip4)
+ {
+ lldp_build_mgmt_addr_tlv (t0p, 1, /* address subtype: Ipv4 */
+ len_ip4, /* address string length */
+ n->mgmt_ip4, /* address */
+ hw->hw_if_index, /* if index */
+ vec_len (n->mgmt_oid), /* OID length */
+ n->mgmt_oid); /* OID */
+ }
+
+ if (len_ip6)
+ {
+ lldp_build_mgmt_addr_tlv (t0p, 2, /* address subtype: Ipv6 */
+ len_ip6, /* address string length */
+ n->mgmt_ip6, /* address */
+ hw->hw_if_index, /* if index */
+ vec_len (n->mgmt_oid), /* OID length */
+ n->mgmt_oid); /* OID */
+ }
+}
+
+static void
+lldp_add_pdu_end (u8 ** t0p)
+{
+ lldp_tlv_t *t = (lldp_tlv_t *) * t0p;
+ lldp_tlv_set_code (t, LLDP_TLV_NAME (pdu_end));
+ lldp_tlv_set_length (t, 0);
+ *t0p += STRUCT_SIZE_OF (lldp_tlv_t, head);
+}
+
+static void
+lldp_add_tlvs (lldp_main_t * lm, vnet_hw_interface_t * hw, u8 ** t0p,
+ int shutdown, lldp_intf_t * n)
+{
+ lldp_add_chassis_id (hw, t0p);
+ lldp_add_port_id (hw, t0p);
+ lldp_add_ttl (lm, t0p, shutdown);
+ lldp_add_port_desc (lm, n, t0p);
+ lldp_add_sys_name (lm, t0p);
+ lldp_add_mgmt_addr (n, hw, t0p);
+ lldp_add_pdu_end (t0p);
+}
+
+/*
+ * send a lldp pkt on an ethernet interface
+ */
+void
+lldp_send_ethernet (lldp_main_t * lm, lldp_intf_t * n, int shutdown)
+{
+ u32 *to_next;
+ ethernet_header_t *h0;
+ vnet_hw_interface_t *hw;
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u8 *t0;
+ vlib_frame_t *f;
+ vlib_main_t *vm = lm->vlib_main;
+ vnet_main_t *vnm = lm->vnet_main;
+
+ /*
+ * see lldp_template_init() to understand what's already painted
+ * into the buffer by the packet template mechanism
+ */
+ h0 = vlib_packet_template_get_packet (vm, &lm->packet_template, &bi0);
+
+ if (!h0)
+ return;
+
+ /* Add the interface's ethernet source address */
+ hw = vnet_get_hw_interface (vnm, n->hw_if_index);
+
+ clib_memcpy_fast (h0->src_address, hw->hw_address,
+ vec_len (hw->hw_address));
+
+ u8 *data = ((u8 *) h0) + sizeof (*h0);
+ t0 = data;
+
+ /* add TLVs */
+ lldp_add_tlvs (lm, hw, &t0, shutdown, n);
+
+ /* Set the outbound packet length */
+ b0 = vlib_get_buffer (vm, bi0);
+ b0->current_length = sizeof (*h0) + t0 - data;
+
+ /* And the outbound interface */
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = hw->sw_if_index;
+
+ /* And output the packet on the correct interface */
+ f = vlib_get_frame_to_node (vm, hw->output_node_index);
+ to_next = vlib_frame_vector_args (f);
+ to_next[0] = bi0;
+ f->n_vectors = 1;
+
+ vlib_put_frame_to_node (vm, hw->output_node_index, f);
+ n->last_sent = vlib_time_now (vm);
+}
+
+void
+lldp_delete_intf (lldp_main_t * lm, lldp_intf_t * n)
+{
+ if (n)
+ {
+ lldp_unschedule_intf (lm, n);
+ hash_unset (lm->intf_by_hw_if_index, n->hw_if_index);
+ vec_free (n->chassis_id);
+ vec_free (n->port_id);
+ vec_free (n->port_desc);
+ vec_free (n->mgmt_ip4);
+ vec_free (n->mgmt_ip6);
+ vec_free (n->mgmt_oid);
+ pool_put (lm->intfs, n);
+ }
+}
+
+static clib_error_t *
+lldp_template_init (vlib_main_t * vm)
+{
+ lldp_main_t *lm = &lldp_main;
+
+ /* Create the ethernet lldp packet template */
+ {
+ ethernet_header_t h;
+
+ clib_memset (&h, 0, sizeof (h));
+
+ /*
+ * Send to 01:80:C2:00:00:0E - propagation constrained to a single
+ * physical link - stopped by all type of bridge
+ */
+ h.dst_address[0] = 0x01;
+ h.dst_address[1] = 0x80;
+ h.dst_address[2] = 0xC2;
+ /* h.dst_address[3] = 0x00; (clib_memset) */
+ /* h.dst_address[4] = 0x00; (clib_memset) */
+ h.dst_address[5] = 0x0E;
+
+ /* leave src address blank (fill in at send time) */
+
+ h.type = htons (ETHERNET_TYPE_802_1_LLDP);
+
+ vlib_packet_template_init (vm, &lm->packet_template,
+ /* data */ &h, sizeof (h),
+ /* alloc chunk size */ 8, "lldp-ethernet");
+ }
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (lldp_template_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */