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author | Daan De Meyer <daan.j.demeyer@gmail.com> | 2024-04-12 08:46:34 +0200 |
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committer | GitHub <noreply@github.com> | 2024-04-12 08:46:34 +0200 |
commit | dd63f00c6471971e96e4f71f186979230ddaf3d1 (patch) | |
tree | 388c14fa00191416f91ae70d38d75cdd24231d67 | |
parent | resolved: use NULL to represent an empty answer (diff) | |
parent | network/ndisc: drop onlink prefix when valid lifetime is zero (diff) | |
download | systemd-dd63f00c6471971e96e4f71f186979230ddaf3d1.tar.xz systemd-dd63f00c6471971e96e4f71f186979230ddaf3d1.zip |
Merge pull request #32240 from yuwata/network-ndisc-fix-on-link-prefix
network/ndisc: fixlets for on-link prefix
-rw-r--r-- | src/network/networkd-ndisc.c | 79 |
1 files changed, 21 insertions, 58 deletions
diff --git a/src/network/networkd-ndisc.c b/src/network/networkd-ndisc.c index 7f5577f6ae..5d1c895f0d 100644 --- a/src/network/networkd-ndisc.c +++ b/src/network/networkd-ndisc.c @@ -1224,59 +1224,23 @@ static int ndisc_router_process_onlink_prefix(Link *link, sd_ndisc_router *rt) { route->pref = preference; route->lifetime_usec = lifetime_usec; - r = ndisc_request_router_route(route, link, rt); - if (r < 0) - return log_link_warning_errno(link, r, "Could not request prefix route: %m"); - - return 0; -} - -static int ndisc_router_drop_onlink_prefix(Link *link, sd_ndisc_router *rt) { - _cleanup_(route_unrefp) Route *route = NULL; - uint8_t prefixlen; - struct in6_addr prefix; - usec_t lifetime_usec; - int r; - - assert(link); - assert(link->network); - assert(rt); - - /* RFC 4861 section 6.3.4. - * Note, however, that a Prefix Information option with the on-link flag set to zero conveys no - * information concerning on-link determination and MUST NOT be interpreted to mean that addresses - * covered by the prefix are off-link. The only way to cancel a previous on-link indication is to - * advertise that prefix with the L-bit set and the Lifetime set to zero. */ - - if (!link->network->ndisc_use_onlink_prefix) - return 0; - - r = sd_ndisc_router_prefix_get_valid_lifetime(rt, &lifetime_usec); - if (r < 0) - return log_link_warning_errno(link, r, "Failed to get prefix lifetime: %m"); - - if (lifetime_usec != 0) - return 0; - - r = sd_ndisc_router_prefix_get_address(rt, &prefix); - if (r < 0) - return log_link_warning_errno(link, r, "Failed to get prefix address: %m"); - - r = sd_ndisc_router_prefix_get_prefixlen(rt, &prefixlen); - if (r < 0) - return log_link_warning_errno(link, r, "Failed to get prefix length: %m"); - - r = route_new(&route); - if (r < 0) - return log_oom(); - - route->family = AF_INET6; - route->dst.in6 = prefix; - route->dst_prefixlen = prefixlen; - - r = ndisc_remove_route(route, link); - if (r < 0) - return log_link_warning_errno(link, r, "Could not remove prefix route: %m"); + /* RFC 4861 section 6.3.4: + * - If the prefix is not already present in the Prefix List, and the Prefix Information option's + * Valid Lifetime field is non-zero, create a new entry for the prefix and initialize its + * invalidation timer to the Valid Lifetime value in the Prefix Information option. + * + * - If the prefix is already present in the host's Prefix List as the result of a previously + * received advertisement, reset its invalidation timer to the Valid Lifetime value in the Prefix + * Information option. If the new Lifetime value is zero, time-out the prefix immediately. */ + if (lifetime_usec == 0) { + r = ndisc_remove_route(route, link); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to remove prefix route: %m"); + } else { + r = ndisc_request_router_route(route, link, rt); + if (r < 0) + return log_link_warning_errno(link, r, "Failed to request prefix route: %m"); + } return 0; } @@ -1319,12 +1283,11 @@ static int ndisc_router_process_prefix(Link *link, sd_ndisc_router *rt) { if (r < 0) return log_link_warning_errno(link, r, "Failed to get RA prefix flags: %m"); - if (FLAGS_SET(flags, ND_OPT_PI_FLAG_ONLINK)) + if (FLAGS_SET(flags, ND_OPT_PI_FLAG_ONLINK)) { r = ndisc_router_process_onlink_prefix(link, rt); - else - r = ndisc_router_drop_onlink_prefix(link, rt); - if (r < 0) - return r; + if (r < 0) + return r; + } if (FLAGS_SET(flags, ND_OPT_PI_FLAG_AUTO)) { r = ndisc_router_process_autonomous_prefix(link, rt); |