From 2b4200f2510874a3ee9c09f594d5ab6340ffb336 Mon Sep 17 00:00:00 2001 From: Steven Barth Date: Mon, 24 Mar 2014 10:01:54 +0100 Subject: [PATCH] Managed PD: initial support --- src/dhcpv6-ia.c | 217 ++++++++++++++++++++++++++++++++++++++---------- src/dhcpv6.c | 6 ++ src/dhcpv6.h | 8 ++ src/odhcpd.h | 3 + 4 files changed, 189 insertions(+), 45 deletions(-) diff --git a/src/dhcpv6-ia.c b/src/dhcpv6-ia.c index 0d132af..593b5bd 100644 --- a/src/dhcpv6-ia.c +++ b/src/dhcpv6-ia.c @@ -16,15 +16,19 @@ #include "dhcpv6.h" #include "dhcpv4.h" #include "libubox/md5.h" +#include "libubox/usock.h" #include #include #include +#include #include #include #include #include +#include #include +#include #include #include @@ -43,6 +47,20 @@ int dhcpv6_ia_init(void) } +void free_dhcpv6_assignment(struct dhcpv6_assignment *c) +{ + if (c->managed_sock.fd.registered) { + close(c->managed_sock.fd.fd); + ustream_free(&c->managed_sock.stream); + } + + free(c->managed); + free(c->hostname); + free(c->classes); + free(c); +} + + int setup_dhcpv6_ia_interface(struct interface *iface, bool enable) { if (!enable && iface->ia_assignments.next) { @@ -50,9 +68,7 @@ int setup_dhcpv6_ia_interface(struct interface *iface, bool enable) while (!list_empty(&iface->ia_assignments)) { c = list_first_entry(&iface->ia_assignments, struct dhcpv6_assignment, head); list_del(&c->head); - free(c->hostname); - free(c->classes); - free(c); + free_dhcpv6_assignment(c); } } @@ -216,7 +232,7 @@ void dhcpv6_write_statefile(void) if (iface->dhcpv6 == RELAYD_SERVER && iface->ia_assignments.next) { struct dhcpv6_assignment *c; list_for_each_entry(c, &iface->ia_assignments, head) { - if (c->clid_len == 0) + if (c->clid_len == 0 || c->managed_size < 0) continue; char ipbuf[INET6_ADDRSTRLEN]; @@ -233,15 +249,19 @@ void dhcpv6_write_statefile(void) c->assigned, (unsigned)c->length); struct in6_addr addr; - for (size_t i = 0; i < iface->ia_addr_len; ++i) { - if (iface->ia_addr[i].prefix > 96) + struct odhcpd_ipaddr *addrs = (c->managed) ? c->managed : iface->ia_addr; + size_t addrlen = (c->managed) ? (size_t)c->managed_size : iface->ia_addr_len; + + for (size_t i = 0; i < addrlen; ++i) { + if (addrs[i].prefix > 96) continue; - addr = iface->ia_addr[i].addr; + addr = addrs[i].addr; if (c->length == 128) addr.s6_addr32[3] = htonl(c->assigned); else addr.s6_addr32[1] |= htonl(c->assigned); + inet_ntop(AF_INET6, &addr, ipbuf, sizeof(ipbuf) - 1); if (c->length == 128 && c->hostname && i == 0) { @@ -257,7 +277,8 @@ void dhcpv6_write_statefile(void) md5_hash(c->hostname, strlen(c->hostname), &md5); } - l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%hhu ", ipbuf, c->length); + l += snprintf(leasebuf + l, sizeof(leasebuf) - l, "%s/%hhu ", ipbuf, + (c->managed_size) ? addrs[i].prefix : c->length); } leasebuf[l - 1] = '\n'; fwrite(leasebuf, 1, l, fp); @@ -322,28 +343,118 @@ void dhcpv6_write_statefile(void) static void apply_lease(struct interface *iface, struct dhcpv6_assignment *a, bool add) { - if (a->length > 64) + if (a->length > 64 || a->managed_size < 0) return; - for (size_t i = 0; i < iface->ia_addr_len; ++i) { - struct in6_addr prefix = iface->ia_addr[i].addr; + struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr; + size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len; + + for (size_t i = 0; i < addrlen; ++i) { + struct in6_addr prefix = addrs[i].addr; prefix.s6_addr32[1] |= htonl(a->assigned); - odhcpd_setup_route(&prefix, a->length, iface, &a->peer.sin6_addr, add); + odhcpd_setup_route(&prefix, (a->managed_size) ? addrs[i].prefix : a->length, + iface, &a->peer.sin6_addr, add); } } +// More data was received from TCP connection +static void managed_handle_pd_data(struct ustream *s, _unused int bytes_new) +{ + struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock); + time_t now = odhcpd_time(); + bool first = c->managed_size < 0; + + for (;;) { + int pending; + char *data = ustream_get_read_buf(s, &pending); + char *end = memmem(data, pending, "\n\n", 2); + + if (!end) + break; + + end += 2; + end[-1] = 0; + + c->managed_size = 0; + if (c->accept_reconf) + c->reconf_cnt = 1; + + char *saveptr; + for (char *line = strtok_r(data, "\n", &saveptr); line; line = strtok_r(NULL, "\n", &saveptr)) { + c->managed = realloc(c->managed, (c->managed_size + 1) * sizeof(*c->managed)); + struct odhcpd_ipaddr *n = &c->managed[c->managed_size]; + + char *saveptr2, *x = strtok_r(line, "/", &saveptr2); + if (!x || inet_pton(AF_INET6, x, &n->addr) < 1) + continue; + + x = strtok_r(NULL, ",", &saveptr2); + if (sscanf(x, "%hhu", &n->prefix) < 1) + continue; + + x = strtok_r(NULL, ",", &saveptr2); + if (sscanf(x, "%u", &n->preferred) < 1) + continue; + + x = strtok_r(NULL, ",", &saveptr2); + if (sscanf(x, "%u", &n->valid) < 1) + continue; + + n->preferred += now; + n->valid += now; + + ++c->managed_size; + } + + ustream_consume(s, end - data); + } + + if (first && c->managed_size == 0) { + list_del(&c->head); + free_dhcpv6_assignment(c); + } +} + + +// TCP transmission has ended, either because of success or timeout or other error +static void managed_handle_pd_done(struct ustream *s) +{ + struct dhcpv6_assignment *c = container_of(s, struct dhcpv6_assignment, managed_sock); + c->valid_until = odhcpd_time() + 15; + c->managed_size = 0; + if (c->accept_reconf) + c->reconf_cnt = 1; +} + + + static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign) { struct dhcpv6_assignment *c; - if (iface->ia_addr_len < 1) + + if (iface->dhcpv6_pd_manager[0]) { + int fd = usock(USOCK_UNIX | USOCK_TCP, iface->dhcpv6_pd_manager, NULL); + if (fd >= 0) { + assign->managed_sock.stream.notify_read = managed_handle_pd_data; + assign->managed_sock.stream.notify_state = managed_handle_pd_done; + ustream_fd_init(&assign->managed_sock, fd); + ustream_printf(&assign->managed_sock.stream, "::/%d,0,0\n\n", assign->length); + ustream_write_pending(&assign->managed_sock.stream); + assign->managed_size = -1; + list_add(&assign->head, &iface->ia_assignments); + } + return false; + } else if (iface->ia_addr_len < 1) { + return false; + } // Try honoring the hint first uint32_t current = 1, asize = (1 << (64 - assign->length)) - 1; if (assign->assigned) { list_for_each_entry(c, &iface->ia_assignments, head) { - if (c->length == 128) + if (c->length == 128 || c->length == 0) continue; if (assign->assigned >= current && assign->assigned + asize < c->assigned) { @@ -360,7 +471,7 @@ static bool assign_pd(struct interface *iface, struct dhcpv6_assignment *assign) // Fallback to a variable assignment current = 1; list_for_each_entry(c, &iface->ia_assignments, head) { - if (c->length == 128) + if (c->length == 128 || c->length == 0) continue; current = (current + asize) & (~asize); @@ -411,6 +522,9 @@ static bool assign_na(struct interface *iface, struct dhcpv6_assignment *assign) struct dhcpv6_assignment *c; list_for_each_entry(c, &iface->ia_assignments, head) { + if (c->length == 0) + continue; + if (c->assigned > try || c->length != 128) { assign->assigned = try; list_add_tail(&assign->head, &c->head); @@ -487,7 +601,7 @@ static void update(struct interface *iface) struct list_head reassign = LIST_HEAD_INIT(reassign); struct dhcpv6_assignment *c, *d; list_for_each_entry_safe(c, d, &iface->ia_assignments, head) { - if (c->clid_len == 0 || c->valid_until < now) + if (c->clid_len == 0 || c->valid_until < now || c->managed_size) continue; if (c->length < 128 && c->assigned >= border->assigned && c != border) @@ -537,9 +651,7 @@ static void reconf_timer(struct uloop_timeout *event) if ((a->length < 128 && a->clid_len > 0) || (a->length == 128 && a->clid_len == 0)) { list_del(&a->head); - free(a->classes); - free(a->hostname); - free(a); + free_dhcpv6_assignment(a); } } else if (a->reconf_cnt > 0 && a->reconf_cnt < 8 && now > a->reconf_sent + (1 << a->reconf_cnt)) { @@ -548,13 +660,7 @@ static void reconf_timer(struct uloop_timeout *event) send_reconf(iface, a); } } - - if (iface->ia_reconf) { - update(iface); - iface->ia_reconf = false; - } } - uloop_timeout_set(event, 2000); } @@ -585,13 +691,15 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status, uint32_t pref = 3600; uint32_t valid = 3600; - for (size_t i = 0; i < iface->ia_addr_len; ++i) { + struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr; + size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len; + for (size_t i = 0; i < addrlen; ++i) { bool match = true; - if (iface->ia_addr[i].has_class) { + if (addrs[i].has_class) { match = false; if (a->classes_cnt) { for (size_t j = 0; j < a->classes_cnt; ++j) - if (a->classes[j] == iface->ia_addr[i].class) + if (a->classes[j] == addrs[i].class) match = true; } else if (a->all_class) { match = true; @@ -601,11 +709,11 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status, if (!match) continue; - uint32_t prefix_pref = iface->ia_addr[i].preferred - now; - uint32_t prefix_valid = iface->ia_addr[i].valid - now; + uint32_t prefix_pref = addrs[i].preferred - now; + uint32_t prefix_valid = addrs[i].valid - now; - if (iface->ia_addr[i].prefix > 96 || - iface->ia_addr[i].preferred <= (uint32_t)now) + if (addrs[i].prefix > 96 || + addrs[i].preferred <= (uint32_t)now) continue; if (prefix_pref > 86400) @@ -629,10 +737,11 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status, .len = htons(sizeof(p) - 4), .preferred = htonl(prefix_pref), .valid = htonl(prefix_valid), - .prefix = a->length, - .addr = iface->ia_addr[i].addr + .prefix = (a->managed_size) ? a->managed_size : a->length, + .addr = addrs[i].addr }; p.addr.s6_addr32[1] |= htonl(a->assigned); + size_t entrlen = sizeof(p) - 4; #ifdef DHCPV6_OPT_PREFIX_CLASS @@ -654,7 +763,7 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status, struct dhcpv6_ia_addr n = { .type = htons(DHCPV6_OPT_IA_ADDR), .len = htons(sizeof(n) - 4), - .addr = iface->ia_addr[i].addr, + .addr = addrs[i].addr, .preferred = htonl(prefix_pref), .valid = htonl(prefix_valid) }; @@ -711,12 +820,15 @@ static size_t append_reply(uint8_t *buf, size_t buflen, uint16_t status, bool found = false; if (a) { - for (size_t i = 0; i < iface->ia_addr_len; ++i) { - if (iface->ia_addr[i].prefix > 96 || - iface->ia_addr[i].preferred <= (uint32_t)now) + struct odhcpd_ipaddr *addrs = (a->managed) ? a->managed : iface->ia_addr; + size_t addrlen = (a->managed) ? (size_t)a->managed_size : iface->ia_addr_len; + + for (size_t i = 0; i < addrlen; ++i) { + if (addrs[i].prefix > 96 || + addrs[i].preferred <= (uint32_t)now) continue; - struct in6_addr addr = iface->ia_addr[i].addr; + struct in6_addr addr = addrs[i].addr; if (ia->type == htons(DHCPV6_OPT_IA_PD)) { addr.s6_addr32[1] |= htonl(a->assigned); @@ -823,6 +935,7 @@ size_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface, update(iface); bool update_state = false; + bool managed_pd_out = false; struct dhcpv6_assignment *first = NULL; dhcpv6_for_each_option(start, end, otype, olen, odata) { @@ -926,7 +1039,11 @@ size_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface, // Generic message handling uint16_t status = DHCPV6_STATUS_OK; - if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) { + if (a && a->managed_size < 0) { + managed_pd_out = true; + status = DHCPV6_STATUS_NOTONLINK; + ia_response_len = append_reply(buf, buflen, status, ia, NULL, iface, true); + } else if (hdr->msg_type == DHCPV6_MSG_SOLICIT || hdr->msg_type == DHCPV6_MSG_REQUEST) { bool assigned = !!a; if (!a && !iface->no_dynamic_dhcp) { // Create new binding @@ -952,9 +1069,13 @@ size_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface, memcpy(a->clid_data, clid_data, clid_len); if (is_pd) - while (!(assigned = assign_pd(iface, a)) && ++a->length <= 64); + while (!(assigned = assign_pd(iface, a)) && + ++a->length <= 64 && !a->managed_size); else assigned = assign_na(iface, a); + + if (a->managed_size && !assigned) + managed_pd_out = true; } } @@ -992,7 +1113,7 @@ size_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface, // Was only a solicitation: mark binding for removal if (assigned && hdr->msg_type == DHCPV6_MSG_SOLICIT) { - a->valid_until = 0; + a->valid_until = now + 15; } else if (assigned && hdr->msg_type == DHCPV6_MSG_REQUEST) { if (hostname_len > 0) { a->hostname = realloc(a->hostname, hostname_len + 1); @@ -1005,9 +1126,7 @@ size_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface, apply_lease(iface, a, true); update_state = true; } else if (!assigned && a) { // Cleanup failed assignment - free(a->classes); - free(a->hostname); - free(a); + free_dhcpv6_assignment(a); } } else if (hdr->msg_type == DHCPV6_MSG_RENEW || hdr->msg_type == DHCPV6_MSG_RELEASE || @@ -1049,6 +1168,14 @@ size_t dhcpv6_handle_ia(uint8_t *buf, size_t buflen, struct interface *iface, buf[4] = 0; buf[5] = DHCPV6_STATUS_OK; response_len += 6; + } else if (managed_pd_out && response_len + 6 < buflen) { + buf[0] = 0; + buf[1] = DHCPV6_OPT_STATUS; + buf[2] = 0; + buf[3] = 2; + buf[4] = 0; + buf[5] = DHCPV6_STATUS_NOADDRSAVAIL; + response_len += 6; } if (update_state) diff --git a/src/dhcpv6.c b/src/dhcpv6.c index bf48d78..3fa2acf 100644 --- a/src/dhcpv6.c +++ b/src/dhcpv6.c @@ -175,6 +175,9 @@ static void handle_client_request(void *addr, void *data, size_t len, uint16_t duid_type; uint16_t hardware_type; uint8_t mac[6]; + uint16_t solmaxrt_type; + uint16_t solmaxrt_length; + uint32_t solmaxrt_value; uint16_t clientid_type; uint16_t clientid_length; uint8_t clientid_buf[130]; @@ -184,6 +187,9 @@ static void handle_client_request(void *addr, void *data, size_t len, .serverid_length = htons(10), .duid_type = htons(3), .hardware_type = htons(1), + .solmaxrt_type = htons(DHCPV6_OPT_SOL_MAX_RT), + .solmaxrt_length = htons(4), + .solmaxrt_value = htonl(60), .clientid_type = htons(DHCPV6_OPT_CLIENTID), .clientid_buf = {0} }; diff --git a/src/dhcpv6.h b/src/dhcpv6.h index 9b38283..936a350 100644 --- a/src/dhcpv6.h +++ b/src/dhcpv6.h @@ -13,6 +13,8 @@ */ #pragma once +#include + #define ALL_DHCPV6_RELAYS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\ 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x02}}} @@ -54,6 +56,7 @@ #define DHCPV6_OPT_IA_PREFIX 26 #define DHCPV6_OPT_INFO_REFRESH 32 #define DHCPV6_OPT_FQDN 39 +#define DHCPV6_OPT_SOL_MAX_RT 82 #ifdef EXT_PREFIX_CLASS /* draft-bhandari-dhc-class-based-prefix, not yet standardized */ @@ -152,6 +155,11 @@ struct dhcpv6_assignment { uint8_t mac[6]; uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD bool accept_reconf; + + struct odhcpd_ipaddr *managed; + ssize_t managed_size; + struct ustream_fd managed_sock; + uint8_t clid_len; uint8_t clid_data[]; }; diff --git a/src/odhcpd.h b/src/odhcpd.h index 2b7829e..d0373f5 100644 --- a/src/odhcpd.h +++ b/src/odhcpd.h @@ -120,6 +120,9 @@ struct interface { struct odhcpd_event dhcpv4_event; struct list_head dhcpv4_assignments; + // Managed PD + char dhcpv6_pd_manager[128]; + // Services enum odhcpd_mode ra; enum odhcpd_mode dhcpv6; -- 2.25.1