Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 222 insertions, 0 deletions

diff --git a/src/libsystemd-network/radv-internal.h b/src/libsystemd-network/radv-internal.h
new file mode 100644
index 0000000..d6cec90
--- /dev/null
+++ b/src/libsystemd-network/radv-internal.h
@@ -0,0 +1,222 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+/***
+  Copyright © 2017 Intel Corporation. All rights reserved.
+***/
+
+#include <netinet/icmp6.h>
+
+#include "sd-radv.h"
+
+#include "list.h"
+#include "ndisc-protocol.h"
+#include "network-common.h"
+#include "sparse-endian.h"
+#include "time-util.h"
+
+/* RFC 4861 section 6.2.1.
+ * MaxRtrAdvInterval
+ * The maximum time allowed between sending unsolicited multicast Router Advertisements from the
+ * interface, in seconds. MUST be no less than 4 seconds and no greater than 1800 seconds.
+ * Default: 600 seconds */
+#define RADV_MIN_MAX_TIMEOUT_USEC                 (4 * USEC_PER_SEC)
+#define RADV_MAX_MAX_TIMEOUT_USEC                 (1800 * USEC_PER_SEC)
+#define RADV_DEFAULT_MAX_TIMEOUT_USEC             (600 * USEC_PER_SEC)
+/* RFC 4861 section 6.2.1.
+ * MinRtrAdvInterval
+ * The minimum time allowed between sending unsolicited multicast Router Advertisements from the
+ * interface, in seconds. MUST be no less than 3 seconds and no greater than .75 * MaxRtrAdvInterval.
+ * Default: 0.33 * MaxRtrAdvInterval If MaxRtrAdvInterval >= 9 seconds; otherwise, the Default is
+ * MaxRtrAdvInterval (Note, this should be a typo. We use 0.75 * MaxRtrAdvInterval). */
+#define RADV_MIN_MIN_TIMEOUT_USEC                 (3 * USEC_PER_SEC)
+/* RFC 4861 section 6.2.4.
+ * AdvDefaultLifetime
+ * The value to be placed in the Router Lifetime field of Router Advertisements sent from the interface,
+ * in seconds. MUST be either zero or between MaxRtrAdvInterval and 9000 seconds. A value of zero
+ * indicates that the router is not to be used as a default router. These limits may be overridden by
+ * specific documents that describe how IPv6 operates over different link layers. For instance, in a
+ * point-to-point link the peers may have enough information about the number and status of devices at
+ * the other end so that advertisements are needed less frequently.
+ * Default: 3 * MaxRtrAdvInterval */
+#define RADV_MIN_ROUTER_LIFETIME_USEC             RADV_MIN_MAX_TIMEOUT_USEC
+#define RADV_MAX_ROUTER_LIFETIME_USEC             (9000 * USEC_PER_SEC)
+#define RADV_DEFAULT_ROUTER_LIFETIME_USEC         (3 * RADV_DEFAULT_MAX_TIMEOUT_USEC)
+/* RFC 4861 section 4.2.
+ * Retrans Timer
+ * 32-bit unsigned integer. The time, in milliseconds. */
+#define RADV_MAX_RETRANSMIT_USEC                  (UINT32_MAX * USEC_PER_MSEC)
+/* draft-ietf-6man-slaac-renum-02 section 4.1.1.
+ * AdvPreferredLifetime: max(AdvDefaultLifetime, 3 * MaxRtrAdvInterval)
+ * AdvValidLifetime: 2 * AdvPreferredLifetime */
+#define RADV_DEFAULT_PREFERRED_LIFETIME_USEC      CONST_MAX(RADV_DEFAULT_ROUTER_LIFETIME_USEC, 3 * RADV_DEFAULT_MAX_TIMEOUT_USEC)
+#define RADV_DEFAULT_VALID_LIFETIME_USEC          (2 * RADV_DEFAULT_PREFERRED_LIFETIME_USEC)
+/* RFC 4861 section 10.
+ * MAX_INITIAL_RTR_ADVERT_INTERVAL  16 seconds
+ * MAX_INITIAL_RTR_ADVERTISEMENTS    3 transmissions
+ * MAX_FINAL_RTR_ADVERTISEMENTS      3 transmissions
+ * MIN_DELAY_BETWEEN_RAS             3 seconds
+ * MAX_RA_DELAY_TIME                .5 seconds */
+#define RADV_MAX_INITIAL_RTR_ADVERT_INTERVAL_USEC (16 * USEC_PER_SEC)
+#define RADV_MAX_INITIAL_RTR_ADVERTISEMENTS       3
+#define RADV_MAX_FINAL_RTR_ADVERTISEMENTS         3
+#define RADV_MIN_DELAY_BETWEEN_RAS                3
+#define RADV_MAX_RA_DELAY_TIME_USEC               (500 * USEC_PER_MSEC)
+/* From RFC 8781 section 4.1
+ * By default, the value of the Scaled Lifetime field SHOULD be set to the lesser of 3 x MaxRtrAdvInterval */
+#define RADV_PREF64_DEFAULT_LIFETIME_USEC         (3 * RADV_DEFAULT_MAX_TIMEOUT_USEC)
+
+#define RADV_RDNSS_MAX_LIFETIME_USEC              (UINT32_MAX * USEC_PER_SEC)
+#define RADV_DNSSL_MAX_LIFETIME_USEC              (UINT32_MAX * USEC_PER_SEC)
+/* rfc6275 7.4 Neighbor Discovery Home Agent Lifetime.
+ * The default value is the same as the Router Lifetime.
+ * The maximum value corresponds to 18.2 hours. 0 MUST NOT be used. */
+#define RADV_HOME_AGENT_MAX_LIFETIME_USEC         (UINT16_MAX * USEC_PER_SEC)
+
+#define RADV_OPT_ROUTE_INFORMATION                24
+#define RADV_OPT_RDNSS                            25
+#define RADV_OPT_DNSSL                            31
+/* Pref64 option type (RFC8781, section 4) */
+#define RADV_OPT_PREF64                           38
+
+enum RAdvState {
+        RADV_STATE_IDLE                      = 0,
+        RADV_STATE_ADVERTISING               = 1,
+};
+typedef enum RAdvState RAdvState;
+
+struct sd_radv_opt_dns {
+        uint8_t type;
+        uint8_t length;
+        uint16_t reserved;
+        be32_t lifetime;
+} _packed_;
+
+struct sd_radv {
+        unsigned n_ref;
+        RAdvState state;
+
+        int ifindex;
+        char *ifname;
+
+        sd_event *event;
+        int event_priority;
+
+        struct ether_addr mac_addr;
+        uint8_t hop_limit;
+        uint8_t flags;
+        uint32_t mtu;
+        usec_t retransmit_usec;
+        usec_t lifetime_usec; /* timespan */
+
+        int fd;
+        unsigned ra_sent;
+        sd_event_source *recv_event_source;
+        sd_event_source *timeout_event_source;
+
+        unsigned n_prefixes;
+        LIST_HEAD(sd_radv_prefix, prefixes);
+
+        unsigned n_route_prefixes;
+        LIST_HEAD(sd_radv_route_prefix, route_prefixes);
+
+        unsigned n_pref64_prefixes;
+        LIST_HEAD(sd_radv_pref64_prefix, pref64_prefixes);
+
+        size_t n_rdnss;
+        struct sd_radv_opt_dns *rdnss;
+        struct sd_radv_opt_dns *dnssl;
+
+        /* Mobile IPv6 extension: Home Agent Info.  */
+        struct nd_opt_home_agent_info home_agent;
+};
+
+#define radv_prefix_opt__contents {             \
+        uint8_t type;                           \
+        uint8_t length;                         \
+        uint8_t prefixlen;                      \
+        uint8_t flags;                          \
+        be32_t lifetime_valid;                  \
+        be32_t lifetime_preferred;              \
+        uint32_t reserved;                      \
+        struct in6_addr in6_addr;               \
+}
+
+struct radv_prefix_opt radv_prefix_opt__contents;
+
+/* We need the opt substructure to be packed, because we use it in send(). But
+ * if we use _packed_, this means that the structure cannot be used directly in
+ * normal code in general, because the fields might not be properly aligned.
+ * But in this particular case, the structure is defined in a way that gives
+ * proper alignment, even without the explicit _packed_ attribute. To appease
+ * the compiler we use the "unpacked" structure, but we also verify that
+ * structure contains no holes, so offsets are the same when _packed_ is used.
+ */
+struct radv_prefix_opt__packed radv_prefix_opt__contents _packed_;
+assert_cc(sizeof(struct radv_prefix_opt) == sizeof(struct radv_prefix_opt__packed));
+
+struct sd_radv_prefix {
+        unsigned n_ref;
+
+        struct radv_prefix_opt opt;
+
+        LIST_FIELDS(struct sd_radv_prefix, prefix);
+
+        /* These are timespans, NOT points in time. */
+        usec_t lifetime_valid_usec;
+        usec_t lifetime_preferred_usec;
+        /* These are points in time specified with clock_boottime_or_monotonic(), NOT timespans. */
+        usec_t valid_until;
+        usec_t preferred_until;
+};
+
+#define radv_route_prefix_opt__contents {       \
+        uint8_t type;                           \
+        uint8_t length;                         \
+        uint8_t prefixlen;                      \
+        uint8_t flags_reserved;                 \
+        be32_t  lifetime;                       \
+        struct in6_addr in6_addr;               \
+}
+
+struct radv_route_prefix_opt radv_route_prefix_opt__contents;
+
+struct radv_route_prefix_opt__packed radv_route_prefix_opt__contents _packed_;
+assert_cc(sizeof(struct radv_route_prefix_opt) == sizeof(struct radv_route_prefix_opt__packed));
+
+struct sd_radv_route_prefix {
+        unsigned n_ref;
+
+        struct radv_route_prefix_opt opt;
+
+        LIST_FIELDS(struct sd_radv_route_prefix, prefix);
+
+        /* This is a timespan, NOT a point in time. */
+        usec_t lifetime_usec;
+        /* This is a point in time specified with clock_boottime_or_monotonic(), NOT a timespan. */
+        usec_t valid_until;
+};
+
+struct sd_radv_pref64_prefix {
+        unsigned n_ref;
+
+        struct nd_opt_prefix64_info opt;
+
+        struct in6_addr in6_addr;
+        uint8_t prefixlen;
+
+        usec_t lifetime_usec;
+
+        LIST_FIELDS(struct sd_radv_pref64_prefix, prefix);
+};
+
+#define log_radv_errno(radv, error, fmt, ...)           \
+        log_interface_prefix_full_errno(                \
+                "RADV: ",                               \
+                sd_radv, radv,                          \
+                error, fmt, ##__VA_ARGS__)
+#define log_radv(radv, fmt, ...)                        \
+        log_interface_prefix_full_errno_zerook(         \
+                "RADV: ",                               \
+                sd_radv, radv,                          \
+                0, fmt, ##__VA_ARGS__)