c4e3043ea1
Register lcp_nl_init() which adds interface pair add/del callbacks.
lcb_nl_pair_add_cb: Initiate netlink listener for first interface in its
netns. If subsequent adds are in other netns, issue a warning. Keep
refcount.
lcb_nl_pair_del_cb: Remove listener when the last interface pair is
removed.
Socket is opened, file is added to VPP's epoll, with lcp_nl_read_cb()
and lcp_nl_error_cb() callbacks installed.
- lcp_nl_read_cb() calls lcp_nl_callback() which pushes netlink messages
onto a queue and issues NL_EVENT_READ event, any socket read error
issues NL_EVENT_READ_ERR event.
- lcp_nl_error_cb() simply issues NL_EVENT_READ_ERR event.
Then, initialize a process node called lcp_nl_process(), which handles:
- NL_EVENT_READ and call lcp_nl_process_msgs()
- if messages are left in the queue, reschedule consumption after M
msecs. This allows new netlink messages to continuously be read from
the kernel, even if we have lots of messages to consume.
- NL_EVENT_READ_ERR and close/reopens the netlink socket.
lcp_nl_process_msgs() processes up to N messages and/or for up to M
msecs, whichever comes first. For each, calling lcp_nl_dispatch().
lcp_nl_dispatch() ultimately just throws the message away after
logging it with format_nl_object()
91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/*
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* Copyright (c) 2021 Cisco and/or its affiliates.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <vlib/vlib.h>
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#include <plugins/lcpng/lcpng.h>
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#include <netlink/msg.h>
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#include <netlink/netlink.h>
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#include <netlink/socket.h>
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#include <netlink/route/link.h>
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#include <netlink/route/route.h>
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#include <netlink/route/neighbour.h>
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#include <netlink/route/addr.h>
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#include <netlink/route/link/vlan.h>
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typedef enum nl_event_type_t_
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{
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NL_EVENT_READ,
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NL_EVENT_READ_ERR,
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} nl_event_type_t;
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#define NL_RX_BUF_SIZE_DEF (1 << 27) /* 128 MB */
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#define NL_TX_BUF_SIZE_DEF (1 << 18) /* 256 kB */
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#define NL_BATCH_SIZE_DEF (1 << 11) /* 2048 */
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#define NL_BATCH_DELAY_MS_DEF 50 /* 50 ms, max 20 batch/s */
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#define NL_DBG(...) vlib_log_debug (lcp_nl_main.nl_logger, __VA_ARGS__);
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#define NL_INFO(...) vlib_log_info (lcp_nl_main.nl_logger, __VA_ARGS__);
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#define NL_NOTICE(...) vlib_log_notice (lcp_nl_main.nl_logger, __VA_ARGS__);
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#define NL_WARN(...) vlib_log_warn (lcp_nl_main.nl_logger, __VA_ARGS__);
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#define NL_ERROR(...) vlib_log_err (lcp_nl_main.nl_logger, __VA_ARGS__);
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/* struct type to hold context on the netlink message being processed.
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*/
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typedef struct nl_msg_info
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{
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struct nl_msg *msg;
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f64 ts;
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} nl_msg_info_t;
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typedef struct lcp_nl_netlink_namespace
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{
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struct nl_sock *sk_route;
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nl_msg_info_t *nl_msg_queue;
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uword clib_file_index; // clib file that holds the netlink socket for this
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// namespace
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u32 clib_file_lcp_refcnt; // number of interfaces watched in the this netlink
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// namespace
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u8 netns_name[LCP_NS_LEN]; // namespace name (can be empty, for 'self')
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} lcp_nl_netlink_namespace_t;
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typedef struct lcp_nl_main
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{
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vlib_log_class_t nl_logger;
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/* TODO(pim): nl_ns should become a list, one for each unique namespace we
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* created LCP pairs in.
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*/
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lcp_nl_netlink_namespace_t nl_ns;
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u32 rx_buf_size;
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u32 tx_buf_size;
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u32 batch_size;
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u32 batch_delay_ms;
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} lcp_nl_main_t;
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static void lcp_nl_open_socket (u8 *ns);
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static void lcp_nl_close_socket (void);
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u8 *format_nl_object (u8 *s, va_list *args);
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/*
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* fd.io coding-style-patch-verification: ON
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*
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* Local Variables:
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* eval: (c-set-style "gnu")
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* End:
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*/
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