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network/ndisc: set IPv6 MTU through sysctl

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Closes #31496.
This commit is contained in:
Yu Watanabe 2024-04-10 10:13:07 +09:00
parent fb71748e4f
commit 8c9ef90b19
3 changed files with 42 additions and 2 deletions
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1
src/network/networkd-link.h
View File

@ -167,6 +167,7 @@ typedef struct Link {
Set *ndisc_captive_portals;
Set *ndisc_pref64;
Set *ndisc_redirects;
uint32_t ndisc_mtu;
unsigned ndisc_messages;
bool ndisc_configured:1;

36
src/network/networkd-ndisc.c
View File

@ -1027,6 +1027,37 @@ static int ndisc_router_process_hop_limit(Link *link, sd_ndisc_router *rt) {
return 0;
}
static int ndisc_router_process_mtu(Link *link, sd_ndisc_router *rt) {
uint32_t mtu;
int r;
assert(link);
assert(link->network);
assert(rt);
if (!link->network->ndisc_use_mtu)
return 0;
/* Ignore the MTU option if the lifetime is zero. */
r = sd_ndisc_router_get_lifetime(rt, NULL);
if (r <= 0)
return r;
r = sd_ndisc_router_get_mtu(rt, &mtu);
if (r == -ENODATA)
return 0;
if (r < 0)
return log_link_warning_errno(link, r, "Failed to get MTU from RA: %m");
link->ndisc_mtu = mtu;
r = link_set_ipv6_mtu(link, LOG_DEBUG);
if (r < 0)
log_link_warning_errno(link, r, "Failed to apply IPv6 MTU (%"PRIu32"), ignoring: %m", mtu);
return 0;
}
static int ndisc_router_process_autonomous_prefix(Link *link, sd_ndisc_router *rt) {
usec_t lifetime_valid_usec, lifetime_preferred_usec;
_cleanup_set_free_ Set *addresses = NULL;
@ -2098,6 +2129,10 @@ static int ndisc_router_handler(Link *link, sd_ndisc_router *rt) {
if (r < 0)
return r;
r = ndisc_router_process_mtu(link, rt);
if (r < 0)
return r;
r = ndisc_router_process_options(link, rt);
if (r < 0)
return r;
@ -2432,6 +2467,7 @@ void ndisc_flush(Link *link) {
link->ndisc_captive_portals = set_free(link->ndisc_captive_portals);
link->ndisc_pref64 = set_free(link->ndisc_pref64);
link->ndisc_redirects = set_free(link->ndisc_redirects);
link->ndisc_mtu = 0;
}
static const char* const ndisc_start_dhcp6_client_table[_IPV6_ACCEPT_RA_START_DHCP6_CLIENT_MAX] = {

7
src/network/networkd-sysctl.c
View File

@ -251,7 +251,7 @@ static int link_set_ipv6_proxy_ndp(Link *link) {
}
int link_set_ipv6_mtu(Link *link, int log_level) {
uint32_t mtu;
uint32_t mtu = 0;
assert(link);
@ -260,7 +260,10 @@ int link_set_ipv6_mtu(Link *link, int log_level) {
assert(link->network);
mtu = link->network->ipv6_mtu;
if (link->network->ndisc_use_mtu)
mtu = link->ndisc_mtu;
if (mtu == 0)
mtu = link->network->ipv6_mtu;
if (mtu == 0)
return 0;