src/libsystemd-network/radv-internal.h

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2 #pragma once
   3
   4 /***
   5   Copyright © 2017 Intel Corporation. All rights reserved.
   6 ***/
   7
   8 #include "sd-radv.h"
   9
  10 #include "log.h"
  11 #include "list.h"
  12 #include "sparse-endian.h"
  13
  14 assert_cc(SD_RADV_DEFAULT_MIN_TIMEOUT_USEC <= SD_RADV_DEFAULT_MAX_TIMEOUT_USEC);
  15
  16 #define SD_RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC (16*USEC_PER_SEC)
  17 #define SD_RADV_MAX_INITIAL_RTR_ADVERTISEMENTS  3
  18 #define SD_RADV_MAX_FINAL_RTR_ADVERTISEMENTS    3
  19 #define SD_RADV_MIN_DELAY_BETWEEN_RAS           3
  20 #define SD_RADV_MAX_RA_DELAY_TIME_USEC          (500*USEC_PER_MSEC)
  21
  22 #define SD_RADV_OPT_ROUTE_INFORMATION           24
  23 #define SD_RADV_OPT_RDNSS                       25
  24 #define SD_RADV_OPT_DNSSL                       31
  25
  26 enum RAdvState {
  27         SD_RADV_STATE_IDLE                      = 0,
  28         SD_RADV_STATE_ADVERTISING               = 1,
  29 };
  30 typedef enum RAdvState RAdvState;
  31
  32 struct sd_radv_opt_dns {
  33         uint8_t type;
  34         uint8_t length;
  35         uint16_t reserved;
  36         be32_t lifetime;
  37 } _packed_;
  38
  39 struct sd_radv {
  40         unsigned n_ref;
  41         RAdvState state;
  42
  43         int ifindex;
  44
  45         sd_event *event;
  46         int event_priority;
  47
  48         struct ether_addr mac_addr;
  49         uint8_t hop_limit;
  50         uint8_t flags;
  51         uint32_t mtu;
  52         uint16_t lifetime;
  53
  54         int fd;
  55         unsigned ra_sent;
  56         sd_event_source *recv_event_source;
  57         sd_event_source *timeout_event_source;
  58
  59         unsigned n_prefixes;
  60         LIST_HEAD(sd_radv_prefix, prefixes);
  61
  62         unsigned n_route_prefixes;
  63         LIST_HEAD(sd_radv_route_prefix, route_prefixes);
  64
  65         size_t n_rdnss;
  66         struct sd_radv_opt_dns *rdnss;
  67         struct sd_radv_opt_dns *dnssl;
  68 };
  69
  70 #define radv_prefix_opt__contents {             \
  71         uint8_t type;                           \
  72         uint8_t length;                         \
  73         uint8_t prefixlen;                      \
  74         uint8_t flags;                          \
  75         be32_t valid_lifetime;                  \
  76         be32_t preferred_lifetime;              \
  77         uint32_t reserved;                      \
  78         struct in6_addr in6_addr;               \
  79 }
  80
  81 struct radv_prefix_opt radv_prefix_opt__contents;
  82
  83 /* We need the opt substructure to be packed, because we use it in send(). But
  84  * if we use _packed_, this means that the structure cannot be used directly in
  85  * normal code in general, because the fields might not be properly aligned.
  86  * But in this particular case, the structure is defined in a way that gives
  87  * proper alignment, even without the explicit _packed_ attribute. To appease
  88  * the compiler we use the "unpacked" structure, but we also verify that
  89  * structure contains no holes, so offsets are the same when _packed_ is used.
  90  */
  91 struct radv_prefix_opt__packed radv_prefix_opt__contents _packed_;
  92 assert_cc(sizeof(struct radv_prefix_opt) == sizeof(struct radv_prefix_opt__packed));
  93
  94 struct sd_radv_prefix {
  95         unsigned n_ref;
  96
  97         struct radv_prefix_opt opt;
  98
  99         LIST_FIELDS(struct sd_radv_prefix, prefix);
 100
 101         usec_t valid_until;
 102         usec_t preferred_until;
 103 };
 104
 105 #define radv_route_prefix_opt__contents {       \
 106         uint8_t type;                           \
 107         uint8_t length;                         \
 108         uint8_t prefixlen;                      \
 109         uint8_t flags_reserved;                 \
 110         be32_t  lifetime;                       \
 111         struct in6_addr in6_addr;               \
 112 }
 113
 114 struct radv_route_prefix_opt radv_route_prefix_opt__contents;
 115
 116 struct radv_route_prefix_opt__packed radv_route_prefix_opt__contents _packed_;
 117 assert_cc(sizeof(struct radv_route_prefix_opt) == sizeof(struct radv_route_prefix_opt__packed));
 118
 119 struct sd_radv_route_prefix {
 120         unsigned n_ref;
 121
 122         struct radv_route_prefix_opt opt;
 123
 124         LIST_FIELDS(struct sd_radv_route_prefix, prefix);
 125 };
 126
 127 #define log_radv_full(level, error, fmt, ...) log_internal(level, error, PROJECT_FILE, __LINE__, __func__, "RADV: " fmt, ##__VA_ARGS__)
 128 #define log_radv_errno(error, fmt, ...) log_radv_full(LOG_DEBUG, error, fmt, ##__VA_ARGS__)
 129 #define log_radv(fmt, ...) log_radv_errno(0, fmt, ##__VA_ARGS__)