diff options
Diffstat (limited to 'src/libsystemd-network/sd-dhcp6-client.c')
| -rw-r--r-- | src/libsystemd-network/sd-dhcp6-client.c | 218 |
1 files changed, 216 insertions, 2 deletions
diff --git a/src/libsystemd-network/sd-dhcp6-client.c b/src/libsystemd-network/sd-dhcp6-client.c index 7be64244ad..431801d6f0 100644 --- a/src/libsystemd-network/sd-dhcp6-client.c +++ b/src/libsystemd-network/sd-dhcp6-client.c @@ -21,6 +21,7 @@ #include <errno.h> #include <string.h> +#include <sys/ioctl.h> #include "udev.h" #include "udev-util.h" @@ -33,6 +34,7 @@ #include "sd-dhcp6-client.h" #include "dhcp6-protocol.h" #include "dhcp6-internal.h" +#include "dhcp6-lease-internal.h" #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) @@ -47,6 +49,7 @@ struct sd_dhcp6_client { struct ether_addr mac_addr; DHCP6IA ia_na; be32_t transaction_id; + struct sd_dhcp6_lease *lease; int fd; sd_event_source *receive_message; usec_t retransmit_time; @@ -81,6 +84,17 @@ const char * dhcp6_message_type_table[_DHCP6_MESSAGE_MAX] = { DEFINE_STRING_TABLE_LOOKUP(dhcp6_message_type, int); +const char * dhcp6_message_status_table[_DHCP6_STATUS_MAX] = { + [DHCP6_STATUS_SUCCESS] = "Success", + [DHCP6_STATUS_UNSPEC_FAIL] = "Unspecified failure", + [DHCP6_STATUS_NO_ADDRS_AVAIL] = "No addresses available", + [DHCP6_STATUS_NO_BINDING] = "Binding unavailable", + [DHCP6_STATUS_NOT_ON_LINK] = "Not on link", + [DHCP6_STATUS_USE_MULTICAST] = "Use multicast", +}; + +DEFINE_STRING_TABLE_LOOKUP(dhcp6_message_status, int); + int sd_dhcp6_client_set_callback(sd_dhcp6_client *client, sd_dhcp6_client_cb_t cb, void *userdata) { @@ -377,9 +391,209 @@ static int client_ensure_iaid(sd_dhcp6_client *client) { return 0; } +static int client_parse_message(sd_dhcp6_client *client, + DHCP6Message *message, size_t len, + sd_dhcp6_lease *lease) { + int r; + uint8_t *optval, *option = (uint8_t *)(message + 1), *id = NULL; + uint16_t optcode, status; + size_t optlen, id_len; + bool clientid = false; + be32_t iaid_lease; + + while ((r = dhcp6_option_parse(&option, &len, &optcode, &optlen, + &optval)) >= 0) { + switch (optcode) { + case DHCP6_OPTION_CLIENTID: + if (clientid) { + log_dhcp6_client(client, "%s contains multiple clientids", + dhcp6_message_type_to_string(message->type)); + return -EINVAL; + } + + if (optlen != sizeof(client->duid) || + memcmp(&client->duid, optval, optlen) != 0) { + log_dhcp6_client(client, "%s DUID does not match", + dhcp6_message_type_to_string(message->type)); + + return -EINVAL; + } + clientid = true; + + break; + + case DHCP6_OPTION_SERVERID: + r = dhcp6_lease_get_serverid(lease, &id, &id_len); + if (r >= 0 && id) { + log_dhcp6_client(client, "%s contains multiple serverids", + dhcp6_message_type_to_string(message->type)); + return -EINVAL; + } + + r = dhcp6_lease_set_serverid(lease, optval, optlen); + if (r < 0) + return r; + + break; + + case DHCP6_OPTION_PREFERENCE: + if (optlen != 1) + return -EINVAL; + + r = dhcp6_lease_set_preference(lease, *optval); + if (r < 0) + return r; + + break; + + case DHCP6_OPTION_STATUS_CODE: + if (optlen < 2) + return -EINVAL; + + status = optval[0] << 8 | optval[1]; + if (status) { + log_dhcp6_client(client, "%s Status %s", + dhcp6_message_type_to_string(message->type), + dhcp6_message_status_to_string(status)); + return -EINVAL; + } + + break; + + case DHCP6_OPTION_IA_NA: + r = dhcp6_option_parse_ia(&optval, &optlen, optcode, + &lease->ia); + if (r < 0 && r != -ENOMSG) + return r; + + r = dhcp6_lease_get_iaid(lease, &iaid_lease); + if (r < 0) + return r; + + if (client->ia_na.id != iaid_lease) { + log_dhcp6_client(client, "%s has wrong IAID", + dhcp6_message_type_to_string(message->type)); + return -EINVAL; + } + + break; + } + } + + if ((r < 0 && r != -ENOMSG) || !clientid) { + log_dhcp6_client(client, "%s has incomplete options", + dhcp6_message_type_to_string(message->type)); + return -EINVAL; + } + + r = dhcp6_lease_get_serverid(lease, &id, &id_len); + if (r < 0) + log_dhcp6_client(client, "%s has no server id", + dhcp6_message_type_to_string(message->type)); + + return r; +} + +static int client_receive_advertise(sd_dhcp6_client *client, + DHCP6Message *advertise, size_t len) { + int r; + _cleanup_dhcp6_lease_free_ sd_dhcp6_lease *lease = NULL; + uint8_t pref_advertise = 0, pref_lease = 0; + + if (advertise->type != DHCP6_ADVERTISE) + return -EINVAL; + + r = dhcp6_lease_new(&lease); + if (r < 0) + return r; + + r = client_parse_message(client, advertise, len, lease); + if (r < 0) + return r; + + r = dhcp6_lease_get_preference(lease, &pref_advertise); + if (r < 0) + return r; + + r = dhcp6_lease_get_preference(client->lease, &pref_lease); + if (!client->lease || r < 0 || pref_advertise > pref_lease) { + sd_dhcp6_lease_unref(client->lease); + client->lease = lease; + lease = NULL; + r = 0; + } + + return r; +} + static int client_receive_message(sd_event_source *s, int fd, uint32_t revents, - void *userdata) -{ + void *userdata) { + sd_dhcp6_client *client = userdata; + _cleanup_free_ DHCP6Message *message; + int r, buflen, len; + + assert(s); + assert(client); + assert(client->event); + + r = ioctl(fd, FIONREAD, &buflen); + if (r < 0 || buflen <= 0) + buflen = DHCP6_MIN_OPTIONS_SIZE; + + message = malloc0(buflen); + if (!message) + return -ENOMEM; + + len = read(fd, message, buflen); + if ((size_t)len < sizeof(DHCP6Message)) { + log_dhcp6_client(client, "could not receive message from UDP socket: %s", strerror(errno)); + return 0; + } + + switch(message->type) { + case DHCP6_SOLICIT: + case DHCP6_REQUEST: + case DHCP6_CONFIRM: + case DHCP6_RENEW: + case DHCP6_REBIND: + case DHCP6_RELEASE: + case DHCP6_DECLINE: + case DHCP6_INFORMATION_REQUEST: + case DHCP6_RELAY_FORW: + case DHCP6_RELAY_REPL: + return 0; + + case DHCP6_ADVERTISE: + case DHCP6_REPLY: + case DHCP6_RECONFIGURE: + break; + + default: + log_dhcp6_client(client, "unknown message type %d", + message->type); + return 0; + } + + if (client->transaction_id != (message->transaction_id & + htobe32(0x00ffffff))) + return 0; + + switch (client->state) { + case DHCP6_STATE_SOLICITATION: + r = client_receive_advertise(client, message, len); + + break; + + case DHCP6_STATE_STOPPED: + case DHCP6_STATE_RS: + return 0; + } + + if (r >= 0) { + log_dhcp6_client(client, "Recv %s", + dhcp6_message_type_to_string(message->type)); + } + return 0; } |