diff options
Diffstat (limited to 'lease.c')
| -rw-r--r-- | lease.c | 342 |
1 files changed, 274 insertions, 68 deletions
@@ -14,6 +14,7 @@ #include <stdlib.h> #include <sys/socket.h> #include <time.h> +#include <string.h> #include "common.h" #include "dbg.h" @@ -90,10 +91,13 @@ void leases_free() ipp_free(&pool); } -struct wg_dynamic_lease *new_lease(wg_key pubkey, uint32_t leasetime, - struct in_addr *ipv4, struct in6_addr *ipv6) +struct wg_dynamic_lease *set_lease(const char *devname, wg_key pubkey, + uint32_t leasetime, + const struct in6_addr *lladdr, + const struct in_addr *ipv4, + const struct in6_addr *ipv6) { - struct wg_dynamic_lease *lease, *parent; + struct wg_dynamic_lease *current, *new; uint64_t index_l; uint32_t index, index_h; struct timespec tp; @@ -101,34 +105,79 @@ struct wg_dynamic_lease *new_lease(wg_key pubkey, uint32_t leasetime, int ret; bool wants_ipv4 = !ipv4 || ipv4->s_addr; bool wants_ipv6 = !ipv6 || !IN6_IS_ADDR_UNSPECIFIED(ipv6); + bool ipv4_extended = false; + bool ipv6_extended = false; - lease = malloc(sizeof *lease); - if (!lease) - fatal("malloc()"); +#if DEBUG + char ipv4_asc[INET_ADDRSTRLEN], ipv6_asc[INET6_ADDRSTRLEN]; + wg_key_b64_string pubkey_asc; + wg_key_to_base64(pubkey_asc, pubkey); +#endif + + new = calloc(1, sizeof *new); + if (!new) + fatal("calloc()"); + + current = get_leases(pubkey); - if (wants_ipv4 && !pool.total_ipv4) - return NULL; /* no ipv4 addresses available */ + if (lease_is_valid(current)) { + if (current->ipv4.s_addr) { + if (ipv4 && ipv4->s_addr == current->ipv4.s_addr) { +#if DEBUG + inet_ntop(AF_INET, ¤t->ipv4, ipv4_asc, + INET_ADDRSTRLEN); + debug("extending %s\n", ipv4_asc); +#endif + new->ipv4 = current->ipv4; + ipv4_extended = true; + } + } + if (!IN6_IS_ADDR_UNSPECIFIED(¤t->ipv6)) { + if (ipv6 && IN6_ARE_ADDR_EQUAL(ipv6, ¤t->ipv6)) { +#if DEBUG + inet_ntop(AF_INET6, ¤t->ipv6, ipv6_asc, + INET6_ADDRSTRLEN); + debug("extending %s\n", ipv6_asc); +#endif + new->ipv6 = current->ipv6; + ipv6_extended = true; + } + } + } - if (wants_ipv6 && !pool.totalh_ipv6 && !pool.totall_ipv6) - return NULL; /* no ipv6 addresses available */ +#if DEBUG + if (ipv4) + inet_ntop(AF_INET, ipv4, ipv4_asc, INET_ADDRSTRLEN); + if (ipv6) + inet_ntop(AF_INET6, ipv6, ipv6_asc, INET6_ADDRSTRLEN); +#endif - if (wants_ipv4) { - if (!ipv4) { + if (wants_ipv4 && !ipv4_extended) { + if (!pool.total_ipv4) { + debug("IPv4 pool empty\n"); + } else if (!ipv4) { index = random_bounded(pool.total_ipv4 - 1); debug("new_lease(v4): %u of %u\n", index, pool.total_ipv4); - ipp_addnth_v4(&pool, &lease->ipv4, index); + ipp_addnth_v4(&pool, &new->ipv4, index); } else { - if (ipp_add_v4(&pool, ipv4, 32)) - return NULL; + debug("wants %s: ", ipv4_asc); + + if (!ipp_add_v4(&pool, ipv4, 32)) { + debug("allocated\n"); - memcpy(&lease->ipv4, ipv4, sizeof *ipv4); + new->ipv4 = *ipv4; + } else { + debug("not free\n"); + } } } - if (wants_ipv6) { - if (!ipv6) { + if (wants_ipv6 && !ipv6_extended) { + if (!pool.totalh_ipv6 && !pool.totall_ipv6) { + debug("IPv6 pool empty\n"); + } else if (!ipv6) { if (pool.totalh_ipv6 > 0) { index_l = random_bounded(UINT64_MAX); index_h = random_bounded(pool.totalh_ipv6 - 1); @@ -139,26 +188,49 @@ struct wg_dynamic_lease *new_lease(wg_key pubkey, uint32_t leasetime, debug("new_lease(v6): %u:%ju of %u:%ju\n", index_h, index_l, pool.totalh_ipv6, pool.totall_ipv6); - ipp_addnth_v6(&pool, &lease->ipv6, index_l, index_h); + ipp_addnth_v6(&pool, &new->ipv6, index_l, index_h); } else { - if (ipp_add_v6(&pool, ipv6, 128)) { - if (!ipv4 || ipv4->s_addr) - ipp_del_v4(&pool, ipv4, 32); + debug("wants %s: ", ipv6_asc); - return NULL; - } + if (!ipp_add_v6(&pool, ipv6, 128)) { + debug("allocated\n"); - memcpy(&lease->ipv6, ipv6, sizeof *ipv6); + new->ipv6 = *ipv6; + } else { + debug("not free\n"); + } } } + if (!wants_ipv4 && !ipv4_extended && ipv4 && ipv4->s_addr) { + debug("releasing %s\n", ipv4_asc); + + if (ipp_del_v4(&pool, &new->ipv4, 32)) + die("ipp_del_v4()\n"); + new->ipv4 = (struct in_addr){ 0 }; + } + + if (!wants_ipv6 && !ipv6_extended && ipv6 && + !IN6_IS_ADDR_UNSPECIFIED(ipv6)) { + debug("releasing %s\n", ipv6_asc); + + if (ipp_del_v6(&pool, &new->ipv6, 128)) + die("ipp_del_v6()\n"); + new->ipv6 = (struct in6_addr){ 0 }; + } + + if (!new->ipv4.s_addr && IN6_IS_ADDR_UNSPECIFIED(&new->ipv6)) { + free(new); + return NULL; + } + + new->lladdr = *lladdr; + if (clock_gettime(CLOCK_REALTIME, &tp)) fatal("clock_gettime(CLOCK_REALTIME)"); - - lease->start_real = tp.tv_sec; - lease->start_mono = get_monotonic_time(); - lease->leasetime = leasetime; - lease->next = NULL; + new->start_real = tp.tv_sec; + new->start_mono = get_monotonic_time(); + new->leasetime = leasetime; wg_key *pubcopy = malloc(sizeof(wg_key)); if (!pubcopy) @@ -169,21 +241,23 @@ struct wg_dynamic_lease *new_lease(wg_key pubkey, uint32_t leasetime, if (ret < 0) { fatal("kh_put()"); } else if (ret == 0) { - parent = kh_value(leases_ht, k); - while (parent->next) - parent = parent->next; - - parent->next = lease; - } else { - kh_value(leases_ht, k) = lease; + BUG_ON(!current); + BUG_ON(kh_value(leases_ht, k) != current); + debug("freeing lease: %s\n", lease_to_str(current)); + free(current); } + kh_value(leases_ht, k) = new; + + update_allowed_ips(devname, pubkey, new); - if (lease->start_mono + lease->leasetime < gexpires) - gexpires = lease->start_mono + lease->leasetime; + debug("new lease: %s\n", lease_to_str(new)); + + if (new->start_mono + new->leasetime < gexpires) + gexpires = new->start_mono + new->leasetime; /* TODO: add record to file */ - return lease; + return new; } struct wg_dynamic_lease *get_leases(wg_key pubkey) @@ -196,55 +270,158 @@ struct wg_dynamic_lease *get_leases(wg_key pubkey) return kh_val(leases_ht, k); } -bool extend_lease(struct wg_dynamic_lease *lease, uint32_t leasetime) +struct allowedips_update { + wg_key peer_pubkey; + struct in6_addr lladdr; + struct in_addr ipv4; + struct in6_addr ipv6; +}; + +#if DEBUG +static char *updates_to_str(const struct allowedips_update *u) +{ + static char buf[4096]; + wg_key_b64_string pubkey_asc; + char ll[INET6_ADDRSTRLEN], v4[INET_ADDRSTRLEN], v6[INET6_ADDRSTRLEN]; + + if (!u) + return "(null)"; + + wg_key_to_base64(pubkey_asc, u->peer_pubkey); + inet_ntop(AF_INET, &u->ipv4, v4, sizeof v4); + inet_ntop(AF_INET6, &u->ipv6, v6, sizeof v6); + inet_ntop(AF_INET6, &u->lladdr, ll, sizeof ll); + snprintf(buf, sizeof buf, "(%p) [%s] %s [%s]", u, ll, v4, v6); + + return buf; +} +#endif + +static void update_allowed_ips_bulk(const char *devname, + const struct allowedips_update *updates, + int nupdates) +{ + wg_peer peers[WG_DYNAMIC_LEASE_CHUNKSIZE] = { 0 }; + wg_allowedip allowedips[3 * WG_DYNAMIC_LEASE_CHUNKSIZE] = { 0 }; + wg_device dev = { 0 }; + wg_peer **pp = &dev.first_peer; + + int peer_idx = 0; + int allowedips_idx = 0; + for (int i = 0; i < nupdates; i++) { + debug("setting allowedips for %s\n", + updates_to_str(&updates[i])); + + peers[peer_idx].flags |= WGPEER_REPLACE_ALLOWEDIPS; + memcpy(peers[peer_idx].public_key, updates[i].peer_pubkey, + sizeof(wg_key)); + wg_allowedip **aipp = &peers[peer_idx].first_allowedip; + + if (!IN6_IS_ADDR_UNSPECIFIED(&updates[i].lladdr)) { + allowedips[allowedips_idx] = (wg_allowedip){ + .family = AF_INET6, + .cidr = 128, + .ip6 = updates[i].lladdr, + }; + *aipp = &allowedips[allowedips_idx]; + aipp = &allowedips[allowedips_idx].next_allowedip; + ++allowedips_idx; + } + if (updates[i].ipv4.s_addr) { + allowedips[allowedips_idx] = (wg_allowedip){ + .family = AF_INET, + .cidr = 32, + .ip4 = updates[i].ipv4, + }; + *aipp = &allowedips[allowedips_idx]; + aipp = &allowedips[allowedips_idx].next_allowedip; + ++allowedips_idx; + } + if (!IN6_IS_ADDR_UNSPECIFIED(&updates[i].ipv6)) { + allowedips[allowedips_idx] = (wg_allowedip){ + .family = AF_INET6, + .cidr = 128, + .ip6 = updates[i].ipv6, + }; + *aipp = &allowedips[allowedips_idx]; + ++allowedips_idx; + } + + *pp = &peers[peer_idx]; + pp = &peers[peer_idx].next_peer; + ++peer_idx; + } + + strncpy(dev.name, devname, sizeof(dev.name) - 1); + if (wg_set_device(&dev)) + fatal("wg_set_device()"); +} + +void update_allowed_ips(const char *devname, wg_key peer_pubkey, + const struct wg_dynamic_lease *lease) { - UNUSED(lease); - UNUSED(leasetime); - return false; + struct allowedips_update update; + + memcpy(update.peer_pubkey, peer_pubkey, sizeof(wg_key)); + update.lladdr = lease->lladdr; + update.ipv4 = lease->ipv4; + update.ipv6 = lease->ipv6; + + update_allowed_ips_bulk(devname, &update, 1); } -int leases_refresh() +int leases_refresh(const char *devname) { time_t cur_time = get_monotonic_time(); + struct allowedips_update updates[WG_DYNAMIC_LEASE_CHUNKSIZE] = { 0 }; if (cur_time < gexpires) return MIN(INT_MAX / 1000, gexpires - cur_time); gexpires = TIME_T_MAX; + int i = 0; for (khint_t k = kh_begin(leases_ht); k != kh_end(leases_ht); ++k) { if (!kh_exist(leases_ht, k)) continue; - - struct wg_dynamic_lease **pp = &kh_val(leases_ht, k), *tmp; - while (*pp) { - struct in_addr *ipv4 = &(*pp)->ipv4; - struct in6_addr *ipv6 = &(*pp)->ipv6; - time_t expires = (*pp)->start_mono + (*pp)->leasetime; - if (cur_time >= expires) { - if (ipv4->s_addr) - ipp_del_v4(&pool, ipv4, 32); - - if (!IN6_IS_ADDR_UNSPECIFIED(ipv6)) - ipp_del_v6(&pool, ipv6, 128); - - tmp = *pp; - *pp = (*pp)->next; - free(tmp); - } else { - if (expires < gexpires) - gexpires = expires; - - pp = &(*pp)->next; + struct wg_dynamic_lease *lease = kh_val(leases_ht, k); + BUG_ON(!lease); + time_t expires = lease->start_mono + lease->leasetime; + if (cur_time >= expires) { + if (lease->ipv4.s_addr) + ipp_del_v4(&pool, &lease->ipv4, 32); + + if (!IN6_IS_ADDR_UNSPECIFIED(&lease->ipv6)) + ipp_del_v6(&pool, &lease->ipv6, 128); + + memcpy(updates[i].peer_pubkey, kh_key(leases_ht, k), + sizeof(wg_key)); + updates[i].lladdr = lease->lladdr; + +#if DEBUG + wg_key_b64_string pubkey_asc; + wg_key_to_base64(pubkey_asc, updates[i].peer_pubkey); + debug("Peer losing its lease: %s\n", pubkey_asc); +#endif + ++i; + if (i == WG_DYNAMIC_LEASE_CHUNKSIZE) { + update_allowed_ips_bulk(devname, updates, i); + i = 0; + memset(updates, 0, sizeof updates); } - } - if (!kh_val(leases_ht, k)) { + free(lease); free((char *)kh_key(leases_ht, k)); kh_del(leaseht, leases_ht, k); + } else { + if (expires < gexpires) + gexpires = expires; } } + if (i) + update_allowed_ips_bulk(devname, updates, i); + return MIN(INT_MAX / 1000, gexpires - cur_time); } @@ -347,3 +524,32 @@ void leases_update_pools(struct mnl_socket *nlsock) if (ret == -1 && errno != EAGAIN && errno != EWOULDBLOCK) fatal("mnl_socket_recvfrom()"); } + +bool lease_is_valid(const struct wg_dynamic_lease *lease) +{ + if (!lease) + return false; + + if (get_monotonic_time() >= lease->start_mono + lease->leasetime) + return false; + + return true; +} + +#ifdef DEBUG +char *lease_to_str(const struct wg_dynamic_lease *l) +{ + static char buf[4096]; + char ll[INET6_ADDRSTRLEN], v4[INET_ADDRSTRLEN], v6[INET6_ADDRSTRLEN]; + + if (!l) + return "(null)"; + + inet_ntop(AF_INET6, &l->lladdr, ll, sizeof ll); + inet_ntop(AF_INET, &l->ipv4, v4, sizeof v4); + inet_ntop(AF_INET6, &l->ipv6, v6, sizeof v6); + snprintf(buf, sizeof buf, "(%p) [%s] %s [%s]", l, ll, v4, v6); + + return buf; +} +#endif |