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network/radv: introduce ReachableTimeSec= setting

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To make the reachable time in the RA header sent by networkd
configurable.
This commit is contained in:
Yu Watanabe 2024-02-21 14:08:57 +09:00
parent bc50700c7e
commit 59d475ba40
6 changed files with 30 additions and 9 deletions
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13
man/systemd.network.xml
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@ -4017,6 +4017,19 @@ ServerAddress=192.168.0.1/24</programlisting>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>ReachableTimeSec=</varname></term>
<listitem>
<para>Configures the time, used in the Neighbor Unreachability Detection algorithm, for which
clients can assume a neighbor is reachable after having received a reachability confirmation. Takes
a time span in the range 0…4294967295 ms. When 0, clients will handle it as if the value wasn't
specified. Defaults to 0.</para>
<xi:include href="version-info.xml" xpointer="v256"/>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>RetransmitSec=</varname></term>

6
src/libsystemd-network/radv-internal.h
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@ -43,9 +43,11 @@
#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
* Reachable Time and Retrans Timer
* 32-bit unsigned integer. The time, in milliseconds. */
#define RADV_MAX_RETRANSMIT_USEC (UINT32_MAX * USEC_PER_MSEC)
#define RADV_MAX_UINT32_MSEC_USEC (UINT32_MAX * USEC_PER_MSEC)
#define RADV_MAX_REACHABLE_TIME_USEC RADV_MAX_UINT32_MSEC_USEC
#define RADV_MAX_RETRANSMIT_USEC RADV_MAX_UINT32_MSEC_USEC
/* draft-ietf-6man-slaac-renum-02 section 4.1.1.
* AdvPreferredLifetime: max(AdvDefaultLifetime, 3 * MaxRtrAdvInterval)
* AdvValidLifetime: 2 * AdvPreferredLifetime */

3
src/network/networkd-network-gperf.gperf
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@ -393,7 +393,8 @@ DHCPPrefixDelegation.RouteMetric, config_parse_uint32,
DHCPPrefixDelegation.NetLabel, config_parse_string, CONFIG_PARSE_STRING_SAFE, offsetof(Network, dhcp_pd_netlabel)
DHCPPrefixDelegation.NFTSet, config_parse_nft_set, NFT_SET_PARSE_NETWORK, offsetof(Network, dhcp_pd_nft_set_context)
IPv6SendRA.RouterLifetimeSec, config_parse_router_lifetime, 0, offsetof(Network, router_lifetime_usec)
IPv6SendRA.RetransmitSec, config_parse_router_retransmit, 0, offsetof(Network, router_retransmit_usec)
IPv6SendRA.ReachableTimeSec, config_parse_router_uint32_msec_usec, 0, offsetof(Network, router_reachable_usec)
IPv6SendRA.RetransmitSec, config_parse_router_uint32_msec_usec, 0, offsetof(Network, router_retransmit_usec)
IPv6SendRA.Managed, config_parse_bool, 0, offsetof(Network, router_managed)
IPv6SendRA.OtherInformation, config_parse_bool, 0, offsetof(Network, router_other_information)
IPv6SendRA.RouterPreference, config_parse_router_preference, 0, 0

1
src/network/networkd-network.h
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@ -246,6 +246,7 @@ struct Network {
RADVPrefixDelegation router_prefix_delegation;
usec_t router_lifetime_usec;
uint8_t router_preference;
usec_t router_reachable_usec;
usec_t router_retransmit_usec;
uint8_t router_hop_limit;
bool router_managed;

14
src/network/networkd-radv.c
View File

@ -577,6 +577,10 @@ static int radv_configure(Link *link) {
return r;
}
r = sd_radv_set_reachable_time(link->radv, link->network->router_reachable_usec);
if (r < 0)
return r;
if (link->network->router_retransmit_usec > 0) {
r = sd_radv_set_retransmit(link->radv, link->network->router_retransmit_usec);
if (r < 0)
@ -1496,7 +1500,7 @@ int config_parse_router_lifetime(
return 0;
}
int config_parse_router_retransmit(
int config_parse_router_uint32_msec_usec(
const char *unit,
const char *filename,
unsigned line,
@ -1508,7 +1512,7 @@ int config_parse_router_retransmit(
void *data,
void *userdata) {
usec_t usec, *router_retransmit_usec = ASSERT_PTR(data);
usec_t usec, *router_usec = ASSERT_PTR(data);
int r;
assert(filename);
@ -1517,7 +1521,7 @@ int config_parse_router_retransmit(
assert(rvalue);
if (isempty(rvalue)) {
*router_retransmit_usec = 0;
*router_usec = 0;
return 0;
}
@ -1529,13 +1533,13 @@ int config_parse_router_retransmit(
}
if (usec != USEC_INFINITY &&
usec > RADV_MAX_RETRANSMIT_USEC) {
usec > RADV_MAX_UINT32_MSEC_USEC) {
log_syntax(unit, LOG_WARNING, filename, line, 0,
"Invalid [%s] %s=, ignoring assignment: %s", section, lvalue, rvalue);
return 0;
}
*router_retransmit_usec = usec;
*router_usec = usec;
return 0;
}

2
src/network/networkd-radv.h
View File

@ -86,7 +86,7 @@ RADVPrefixDelegation radv_prefix_delegation_from_string(const char *s) _pure_;
CONFIG_PARSER_PROTOTYPE(config_parse_router_prefix_delegation);
CONFIG_PARSER_PROTOTYPE(config_parse_router_lifetime);
CONFIG_PARSER_PROTOTYPE(config_parse_router_retransmit);
CONFIG_PARSER_PROTOTYPE(config_parse_router_uint32_msec_usec);
CONFIG_PARSER_PROTOTYPE(config_parse_router_preference);
CONFIG_PARSER_PROTOTYPE(config_parse_prefix);
CONFIG_PARSER_PROTOTYPE(config_parse_prefix_boolean);