f3c33b234d
When loading .netdev files we parse them twice: first we do one parsing iteration to figure out their "kind", and then we do it again to parse out the kind's parameters. The first iteration is run with a "short" NetDev structure, that only covers the generic NetDev properties. Which should be enough, as we don't parse the per-kind properties. However, before this patch we'd still try to destruct the per-kind properties which resulted in memory corruption. With this change we distuingish the two iterations by the state field, so that the destruction only happens when the state signals we are running with a full NetDev structure. Since this is not obvious, let's add a lot of comments.
210 lines
7.8 KiB
C
210 lines
7.8 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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/***
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This file is part of systemd.
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Copyright 2013 Tom Gundersen <teg@jklm.no>
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "sd-netlink.h"
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#include "list.h"
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#include "time-util.h"
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typedef struct netdev_join_callback netdev_join_callback;
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typedef struct Link Link;
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struct netdev_join_callback {
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sd_netlink_message_handler_t callback;
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Link *link;
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LIST_FIELDS(netdev_join_callback, callbacks);
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};
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typedef enum NetDevKind {
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NETDEV_KIND_BRIDGE,
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NETDEV_KIND_BOND,
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NETDEV_KIND_VLAN,
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NETDEV_KIND_MACVLAN,
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NETDEV_KIND_MACVTAP,
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NETDEV_KIND_IPVLAN,
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NETDEV_KIND_VXLAN,
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NETDEV_KIND_IPIP,
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NETDEV_KIND_GRE,
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NETDEV_KIND_GRETAP,
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NETDEV_KIND_IP6GRE,
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NETDEV_KIND_IP6GRETAP,
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NETDEV_KIND_SIT,
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NETDEV_KIND_VETH,
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NETDEV_KIND_VTI,
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NETDEV_KIND_VTI6,
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NETDEV_KIND_IP6TNL,
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NETDEV_KIND_DUMMY,
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NETDEV_KIND_TUN,
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NETDEV_KIND_TAP,
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NETDEV_KIND_VRF,
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NETDEV_KIND_VCAN,
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NETDEV_KIND_GENEVE,
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NETDEV_KIND_VXCAN,
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_NETDEV_KIND_MAX,
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_NETDEV_KIND_INVALID = -1
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} NetDevKind;
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typedef enum NetDevState {
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NETDEV_STATE_LOADING,
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NETDEV_STATE_FAILED,
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NETDEV_STATE_CREATING,
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NETDEV_STATE_READY,
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NETDEV_STATE_LINGER,
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_NETDEV_STATE_MAX,
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_NETDEV_STATE_INVALID = -1,
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} NetDevState;
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typedef enum NetDevCreateType {
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NETDEV_CREATE_INDEPENDENT,
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NETDEV_CREATE_MASTER,
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NETDEV_CREATE_STACKED,
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_NETDEV_CREATE_MAX,
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_NETDEV_CREATE_INVALID = -1,
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} NetDevCreateType;
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typedef struct Manager Manager;
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typedef struct Condition Condition;
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typedef struct NetDev {
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Manager *manager;
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int n_ref;
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char *filename;
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Condition *match_host;
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Condition *match_virt;
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Condition *match_kernel_cmdline;
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Condition *match_kernel_version;
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Condition *match_arch;
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NetDevState state;
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NetDevKind kind;
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char *description;
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char *ifname;
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struct ether_addr *mac;
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size_t mtu;
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int ifindex;
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LIST_HEAD(netdev_join_callback, callbacks);
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} NetDev;
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typedef struct NetDevVTable {
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/* How much memory does an object of this unit type need */
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size_t object_size;
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/* Config file sections this netdev kind understands, separated
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* by NUL chars */
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const char *sections;
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/* This should reset all type-specific variables. This should
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* not allocate memory, and is called with zero-initialized
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* data. It should hence only initialize variables that need
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* to be set != 0. */
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void (*init)(NetDev *n);
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/* This should free all kind-specific variables. It should be
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* idempotent. */
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void (*done)(NetDev *n);
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/* fill in message to create netdev */
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int (*fill_message_create)(NetDev *netdev, Link *link, sd_netlink_message *message);
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/* specifies if netdev is independent, or a master device or a stacked device */
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NetDevCreateType create_type;
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/* create netdev, if not done via rtnl */
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int (*create)(NetDev *netdev);
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/* perform additional configuration after netdev has been createad */
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int (*post_create)(NetDev *netdev, Link *link, sd_netlink_message *message);
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/* verify that compulsory configuration options were specified */
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int (*config_verify)(NetDev *netdev, const char *filename);
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} NetDevVTable;
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extern const NetDevVTable * const netdev_vtable[_NETDEV_KIND_MAX];
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#define NETDEV_VTABLE(n) ((n)->kind != _NETDEV_KIND_INVALID ? netdev_vtable[(n)->kind] : NULL)
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/* For casting a netdev into the various netdev kinds */
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#define DEFINE_NETDEV_CAST(UPPERCASE, MixedCase) \
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static inline MixedCase* UPPERCASE(NetDev *n) { \
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if (_unlikely_(!n || \
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n->kind != NETDEV_KIND_##UPPERCASE) || \
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n->state == _NETDEV_STATE_INVALID) \
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return NULL; \
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\
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return (MixedCase*) n; \
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}
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/* For casting the various netdev kinds into a netdev */
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#define NETDEV(n) (&(n)->meta)
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int netdev_load(Manager *manager);
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void netdev_drop(NetDev *netdev);
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NetDev *netdev_unref(NetDev *netdev);
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NetDev *netdev_ref(NetDev *netdev);
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DEFINE_TRIVIAL_CLEANUP_FUNC(NetDev*, netdev_unref);
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#define _cleanup_netdev_unref_ _cleanup_(netdev_unrefp)
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int netdev_get(Manager *manager, const char *name, NetDev **ret);
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int netdev_set_ifindex(NetDev *netdev, sd_netlink_message *newlink);
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int netdev_enslave(NetDev *netdev, Link *link, sd_netlink_message_handler_t callback);
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int netdev_get_mac(const char *ifname, struct ether_addr **ret);
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int netdev_join(NetDev *netdev, Link *link, sd_netlink_message_handler_t cb);
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const char *netdev_kind_to_string(NetDevKind d) _const_;
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NetDevKind netdev_kind_from_string(const char *d) _pure_;
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int config_parse_netdev_kind(const char *unit, const char *filename, unsigned line, const char *section, unsigned section_line, const char *lvalue, int ltype, const char *rvalue, void *data, void *userdata);
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/* gperf */
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const struct ConfigPerfItem* network_netdev_gperf_lookup(const char *key, GPERF_LEN_TYPE length);
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/* Macros which append INTERFACE= to the message */
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#define log_netdev_full(netdev, level, error, ...) \
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({ \
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const NetDev *_n = (netdev); \
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_n ? log_object_internal(level, error, __FILE__, __LINE__, __func__, "INTERFACE=", _n->ifname, NULL, NULL, ##__VA_ARGS__) : \
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log_internal(level, error, __FILE__, __LINE__, __func__, ##__VA_ARGS__); \
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})
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#define log_netdev_debug(netdev, ...) log_netdev_full(netdev, LOG_DEBUG, 0, ##__VA_ARGS__)
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#define log_netdev_info(netdev, ...) log_netdev_full(netdev, LOG_INFO, 0, ##__VA_ARGS__)
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#define log_netdev_notice(netdev, ...) log_netdev_full(netdev, LOG_NOTICE, 0, ##__VA_ARGS__)
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#define log_netdev_warning(netdev, ...) log_netdev_full(netdev, LOG_WARNING, 0, ## __VA_ARGS__)
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#define log_netdev_error(netdev, ...) log_netdev_full(netdev, LOG_ERR, 0, ##__VA_ARGS__)
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#define log_netdev_debug_errno(netdev, error, ...) log_netdev_full(netdev, LOG_DEBUG, error, ##__VA_ARGS__)
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#define log_netdev_info_errno(netdev, error, ...) log_netdev_full(netdev, LOG_INFO, error, ##__VA_ARGS__)
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#define log_netdev_notice_errno(netdev, error, ...) log_netdev_full(netdev, LOG_NOTICE, error, ##__VA_ARGS__)
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#define log_netdev_warning_errno(netdev, error, ...) log_netdev_full(netdev, LOG_WARNING, error, ##__VA_ARGS__)
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#define log_netdev_error_errno(netdev, error, ...) log_netdev_full(netdev, LOG_ERR, error, ##__VA_ARGS__)
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#define LOG_NETDEV_MESSAGE(netdev, fmt, ...) "MESSAGE=%s: " fmt, (netdev)->ifname, ##__VA_ARGS__
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#define LOG_NETDEV_INTERFACE(netdev) "INTERFACE=%s", (netdev)->ifname
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