diff options
Diffstat (limited to 'src/ndp.c')
| -rw-r--r-- | src/ndp.c | 56 |
1 files changed, 54 insertions, 2 deletions
@@ -29,6 +29,7 @@ #include <linux/rtnetlink.h> #include <linux/filter.h> #include "router.h" +#include "dhcpv6.h" #include "ndp.h" @@ -272,6 +273,58 @@ static void setup_route(struct in6_addr *addr, struct interface *iface, bool add odhcpd_setup_route(addr, 128, iface, NULL, 1024, add); } +// compare prefixes +static int prefixcmp(const void *va, const void *vb) +{ + const struct odhcpd_ipaddr *a = va, *b = vb; + uint32_t a_pref = ((a->addr.s6_addr[0] & 0xfe) != 0xfc) ? a->preferred : 1; + uint32_t b_pref = ((b->addr.s6_addr[0] & 0xfe) != 0xfc) ? b->preferred : 1; + return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0; +} + +// Check address update +static void check_updates(struct interface *iface) +{ + struct odhcpd_ipaddr addr[8] = {{IN6ADDR_ANY_INIT, 0, 0, 0, 0}}; + time_t now = odhcpd_time(); + ssize_t len = odhcpd_get_interface_addresses(iface->ifindex, addr, 8); + + if (len < 0) + return; + + qsort(addr, len, sizeof(*addr), prefixcmp); + + for (int i = 0; i < len; ++i) { + addr[i].addr.s6_addr32[3] = 0; + + if (addr[i].preferred < UINT32_MAX - now) + addr[i].preferred += now; + + if (addr[i].valid < UINT32_MAX - now) + addr[i].valid += now; + } + + bool change = len != (ssize_t)iface->ia_addr_len; + for (ssize_t i = 0; !change && i < len; ++i) + if (!IN6_ARE_ADDR_EQUAL(&addr[i].addr, &iface->ia_addr[i].addr) || + (addr[i].preferred > 0) != (iface->ia_addr[i].preferred > 0) || + addr[i].valid < iface->ia_addr[i].valid || + addr[i].preferred < iface->ia_addr[i].preferred) + change = true; + + if (change) + dhcpv6_ia_preupdate(iface); + + memcpy(iface->ia_addr, addr, len * sizeof(*addr)); + iface->ia_addr_len = len; + + if (change) + dhcpv6_ia_postupdate(iface, now); + + if (change) + raise(SIGUSR1); +} + // Handler for neighbor cache entries from the kernel. This is our source // to learn and unlearn hosts on interfaces. @@ -412,8 +465,7 @@ static void handle_rtnetlink(_unused void *addr, void *data, size_t len, } if (is_addr) { - if (iface->ra == RELAYD_SERVER) - raise(SIGUSR1); // Inform about a change in addresses + check_updates(iface); if (iface->dhcpv6 == RELAYD_SERVER) iface->ia_reconf = true; |