X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Flibsystemd-network%2Fsd-dhcp6-client.c;h=8537d7cc86434f004f90ea365a343dc3882c6fe7;hb=79008bddf679a5e0900369950eb346c9fa687107;hp=6860c66858bc09d25a62742fe046c724fd36ad36;hpb=44481a8b537839cd9ffead4d261491641f5b5260;p=elogind.git diff --git a/src/libsystemd-network/sd-dhcp6-client.c b/src/libsystemd-network/sd-dhcp6-client.c index 6860c6685..8537d7cc8 100644 --- a/src/libsystemd-network/sd-dhcp6-client.c +++ b/src/libsystemd-network/sd-dhcp6-client.c @@ -22,6 +22,7 @@ #include #include #include +#include #include "udev.h" #include "udev-util.h" @@ -39,6 +40,13 @@ #define SYSTEMD_PEN 43793 #define HASH_KEY SD_ID128_MAKE(80,11,8c,c2,fe,4a,03,ee,3e,d6,0c,6f,36,39,14,09) +/* RFC 3315 section 9.1: + * A DUID can be no more than 128 octets long (not including the type code). + */ +#define MAX_DUID_LEN 128 + +#define MAX_MAC_ADDR_LEN INFINIBAND_ALEN + struct sd_dhcp6_client { RefCount n_ref; @@ -46,9 +54,12 @@ struct sd_dhcp6_client { sd_event *event; int event_priority; int index; - struct ether_addr mac_addr; + uint8_t mac_addr[MAX_MAC_ADDR_LEN]; + size_t mac_addr_len; + uint16_t arp_type; DHCP6IA ia_na; be32_t transaction_id; + usec_t transaction_start; struct sd_dhcp6_lease *lease; int fd; be16_t *req_opts; @@ -61,12 +72,33 @@ struct sd_dhcp6_client { sd_event_source *timeout_resend_expire; sd_dhcp6_client_cb_t cb; void *userdata; - - struct duid_en { - uint16_t type; /* DHCP6_DUID_EN */ - uint32_t pen; - uint8_t id[8]; - } _packed_ duid; + union { + struct { + uint16_t type; /* DHCP6_DUID_LLT */ + uint16_t htype; + uint32_t time; + uint8_t haddr[0]; + } _packed_ llt; + struct { + uint16_t type; /* DHCP6_DUID_EN */ + uint32_t pen; + uint8_t id[8]; + } _packed_ en; + struct { + uint16_t type; /* DHCP6_DUID_LL */ + uint16_t htype; + uint8_t haddr[0]; + } _packed_ ll; + struct { + uint16_t type; /* DHCP6_DUID_UUID */ + sd_id128_t uuid; + } _packed_ uuid; + struct { + uint16_t type; + uint8_t data[MAX_DUID_LEN]; + } _packed_ raw; + } duid; + size_t duid_len; }; static const uint16_t default_req_opts[] = { @@ -133,15 +165,64 @@ int sd_dhcp6_client_set_index(sd_dhcp6_client *client, int interface_index) return 0; } -int sd_dhcp6_client_set_mac(sd_dhcp6_client *client, - const struct ether_addr *mac_addr) +int sd_dhcp6_client_set_mac(sd_dhcp6_client *client, const uint8_t *addr, + size_t addr_len, uint16_t arp_type) { assert_return(client, -EINVAL); - - if (mac_addr) - memcpy(&client->mac_addr, mac_addr, sizeof(client->mac_addr)); + assert_return(addr, -EINVAL); + assert_return(addr_len > 0 && addr_len <= MAX_MAC_ADDR_LEN, -EINVAL); + assert_return(arp_type > 0, -EINVAL); + + if (arp_type == ARPHRD_ETHER) + assert_return(addr_len == ETH_ALEN, -EINVAL); + else if (arp_type == ARPHRD_INFINIBAND) + assert_return(addr_len == INFINIBAND_ALEN, -EINVAL); else - memset(&client->mac_addr, 0x00, sizeof(client->mac_addr)); + return -EINVAL; + + if (client->mac_addr_len == addr_len && + memcmp(&client->mac_addr, addr, addr_len) == 0) + return 0; + + memcpy(&client->mac_addr, addr, addr_len); + client->mac_addr_len = addr_len; + client->arp_type = arp_type; + + return 0; +} + +int sd_dhcp6_client_set_duid(sd_dhcp6_client *client, uint16_t type, uint8_t *duid, + size_t duid_len) +{ + assert_return(client, -EINVAL); + assert_return(duid, -EINVAL); + assert_return(duid_len > 0 && duid_len <= MAX_DUID_LEN, -EINVAL); + + switch (type) { + case DHCP6_DUID_LLT: + if (duid_len <= sizeof(client->duid.llt) - 2) + return -EINVAL; + break; + case DHCP6_DUID_EN: + if (duid_len != sizeof(client->duid.en) - 2) + return -EINVAL; + break; + case DHCP6_DUID_LL: + if (duid_len <= sizeof(client->duid.ll) - 2) + return -EINVAL; + break; + case DHCP6_DUID_UUID: + if (duid_len != sizeof(client->duid.uuid) - 2) + return -EINVAL; + break; + default: + /* accept unknown type in order to be forward compatible */ + break; + } + + client->duid.raw.type = htobe16(type); + memcpy(&client->duid.raw.data, duid, duid_len); + client->duid_len = duid_len + 2; /* +2 for sizeof(type) */ return 0; } @@ -203,6 +284,7 @@ static int client_reset(sd_dhcp6_client *client) { client->fd = safe_close(client->fd); client->transaction_id = 0; + client->transaction_start = 0; client->ia_na.timeout_t1 = sd_event_source_unref(client->ia_na.timeout_t1); @@ -230,13 +312,15 @@ static void client_stop(sd_dhcp6_client *client, int error) { client_reset(client); } -static int client_send_message(sd_dhcp6_client *client) { +static int client_send_message(sd_dhcp6_client *client, usec_t time_now) { _cleanup_free_ DHCP6Message *message = NULL; struct in6_addr all_servers = IN6ADDR_ALL_DHCP6_RELAY_AGENTS_AND_SERVERS_INIT; size_t len, optlen = 512; uint8_t *opt; int r; + usec_t elapsed_usec; + be16_t elapsed_time; len = sizeof(DHCP6Message) + optlen; @@ -304,7 +388,18 @@ static int client_send_message(sd_dhcp6_client *client) { return r; r = dhcp6_option_append(&opt, &optlen, DHCP6_OPTION_CLIENTID, - sizeof(client->duid), &client->duid); + client->duid_len, &client->duid); + if (r < 0) + return r; + + elapsed_usec = time_now - client->transaction_start; + if (elapsed_usec < 0xffff * USEC_PER_MSEC * 10) + elapsed_time = htobe16(elapsed_usec / USEC_PER_MSEC / 10); + else + elapsed_time = 0xffff; + + r = dhcp6_option_append(&opt, &optlen, DHCP6_OPTION_ELAPSED_TIME, + sizeof(elapsed_time), &elapsed_time); if (r < 0) return r; @@ -455,15 +550,14 @@ static int client_timeout_resend(sd_event_source *s, uint64_t usec, return 0; } - r = client_send_message(client); - if (r >= 0) - client->retransmit_count++; - - r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); if (r < 0) goto error; + r = client_send_message(client, time_now); + if (r >= 0) + client->retransmit_count++; + if (!client->retransmit_time) { client->retransmit_time = client_timeout_compute_random(init_retransmit_time); @@ -496,8 +590,7 @@ static int client_timeout_resend(sd_event_source *s, uint64_t usec, if (r < 0) goto error; - r = sd_event_source_set_name(client->timeout_resend, - "dhcp6-resend-timer"); + r = sd_event_source_set_description(client->timeout_resend, "dhcp6-resend-timer"); if (r < 0) goto error; @@ -520,8 +613,7 @@ static int client_timeout_resend(sd_event_source *s, uint64_t usec, if (r < 0) goto error; - r = sd_event_source_set_name(client->timeout_resend_expire, - "dhcp6-resend-expire-timer"); + r = sd_event_source_set_description(client->timeout_resend_expire, "dhcp6-resend-expire-timer"); if (r < 0) goto error; } @@ -570,8 +662,8 @@ static int client_ensure_iaid(sd_dhcp6_client *client) { siphash24((uint8_t*)&id, name, strlen(name), HASH_KEY.bytes); else /* fall back to mac address if no predictable name available */ - siphash24((uint8_t*)&id, &client->mac_addr, ETH_ALEN, - HASH_KEY.bytes); + siphash24((uint8_t*)&id, &client->mac_addr, + client->mac_addr_len, HASH_KEY.bytes); /* fold into 32 bits */ client->ia_na.id = (id & 0xffffffff) ^ (id >> 32); @@ -602,7 +694,7 @@ static int client_parse_message(sd_dhcp6_client *client, return -EINVAL; } - if (optlen != sizeof(client->duid) || + if (optlen != client->duid_len || memcmp(&client->duid, optval, optlen) != 0) { log_dhcp6_client(client, "%s DUID does not match", dhcp6_message_type_to_string(message->type)); @@ -882,6 +974,15 @@ static int client_start(sd_dhcp6_client *client, enum DHCP6State state) client->retransmit_time = 0; client->retransmit_count = 0; + if (client->state == DHCP6_STATE_STOPPED) { + time_now = now(clock_boottime_or_monotonic()); + } else { + r = sd_event_now(client->event, clock_boottime_or_monotonic(), + &time_now); + if (r < 0) + return r; + } + switch (state) { case DHCP6_STATE_STOPPED: case DHCP6_STATE_SOLICITATION: @@ -907,8 +1008,7 @@ static int client_start(sd_dhcp6_client *client, enum DHCP6State state) if (r < 0) return r; - r = sd_event_source_set_name(client->receive_message, - "dhcp6-receive-message"); + r = sd_event_source_set_description(client->receive_message, "dhcp6-receive-message"); if (r < 0) return r; @@ -926,10 +1026,6 @@ static int client_start(sd_dhcp6_client *client, enum DHCP6State state) case DHCP6_STATE_BOUND: - r = sd_event_now(client->event, clock_boottime_or_monotonic(), &time_now); - if (r < 0) - return r; - if (client->lease->ia.lifetime_t1 == 0xffffffff || client->lease->ia.lifetime_t2 == 0xffffffff) { @@ -960,8 +1056,7 @@ static int client_start(sd_dhcp6_client *client, enum DHCP6State state) if (r < 0) return r; - r = sd_event_source_set_name(client->lease->ia.timeout_t1, - "dhcp6-t1-timeout"); + r = sd_event_source_set_description(client->lease->ia.timeout_t1, "dhcp6-t1-timeout"); if (r < 0) return r; @@ -985,8 +1080,7 @@ static int client_start(sd_dhcp6_client *client, enum DHCP6State state) if (r < 0) return r; - r = sd_event_source_set_name(client->lease->ia.timeout_t2, - "dhcp6-t2-timeout"); + r = sd_event_source_set_description(client->lease->ia.timeout_t2, "dhcp6-t2-timeout"); if (r < 0) return r; @@ -996,6 +1090,7 @@ static int client_start(sd_dhcp6_client *client, enum DHCP6State state) } client->transaction_id = random_u32() & htobe32(0x00ffffff); + client->transaction_start = time_now; r = sd_event_add_time(client->event, &client->timeout_resend, clock_boottime_or_monotonic(), 0, 0, client_timeout_resend, @@ -1008,8 +1103,7 @@ static int client_start(sd_dhcp6_client *client, enum DHCP6State state) if (r < 0) return r; - r = sd_event_source_set_name(client->timeout_resend, - "dhcp6-resend-timeout"); + r = sd_event_source_set_description(client->timeout_resend, "dhcp6-resend-timeout"); if (r < 0) return r; @@ -1118,8 +1212,9 @@ int sd_dhcp6_client_new(sd_dhcp6_client **ret) client->fd = -1; /* initialize DUID */ - client->duid.type = htobe16(DHCP6_DUID_EN); - client->duid.pen = htobe32(SYSTEMD_PEN); + client->duid.en.type = htobe16(DHCP6_DUID_EN); + client->duid.en.pen = htobe32(SYSTEMD_PEN); + client->duid_len = sizeof(client->duid.en); r = sd_id128_get_machine(&machine_id); if (r < 0) @@ -1127,8 +1222,7 @@ int sd_dhcp6_client_new(sd_dhcp6_client **ret) /* a bit of snake-oil perhaps, but no need to expose the machine-id directly */ - siphash24(client->duid.id, &machine_id, sizeof(machine_id), - HASH_KEY.bytes); + siphash24(client->duid.en.id, &machine_id, sizeof(machine_id), HASH_KEY.bytes); client->req_opts_len = ELEMENTSOF(default_req_opts);