diff options
author | Dan Williams <dcbw@redhat.com> | 2014-10-08 14:15:45 -0500 |
---|---|---|
committer | Tom Gundersen <teg@jklm.no> | 2014-10-11 12:15:54 +0200 |
commit | 76253e73f9c9c24fec755e485516f3b55d0707b4 (patch) | |
tree | ae99dc09b50a8d8de2428dbc6e6b57f51ef6776c /src/libsystemd-network/sd-dhcp-client.c | |
parent | 5482192e5774f52f2af0665a3b58539295e9c0a4 (diff) | |
download | systemd-76253e73f9c9c24fec755e485516f3b55d0707b4.tar.gz |
sd-dhcp-client: support non-Ethernet hardware addresses
Like Infiniband. See RFC 4390 section 2.1 for details on DHCP
and Infiniband; chaddr is zeroed, hlen is set to 0, and htype
is set to ARPHRD_INFINIBAND because IB hardware addresses
are 20 bytes in length.
Diffstat (limited to 'src/libsystemd-network/sd-dhcp-client.c')
-rw-r--r-- | src/libsystemd-network/sd-dhcp-client.c | 74 |
1 files changed, 57 insertions, 17 deletions
diff --git a/src/libsystemd-network/sd-dhcp-client.c b/src/libsystemd-network/sd-dhcp-client.c index 2f94c16078..0eba4c379d 100644 --- a/src/libsystemd-network/sd-dhcp-client.c +++ b/src/libsystemd-network/sd-dhcp-client.c @@ -23,6 +23,7 @@ #include <stdio.h> #include <net/ethernet.h> #include <net/if_arp.h> +#include <linux/if_infiniband.h> #include <netinet/ether.h> #include <sys/param.h> #include <sys/ioctl.h> @@ -37,6 +38,8 @@ #include "dhcp-lease-internal.h" #include "sd-dhcp-client.h" +#define MAX_MAC_ADDR_LEN INFINIBAND_ALEN + struct sd_dhcp_client { RefCount n_ref; @@ -57,6 +60,9 @@ struct sd_dhcp_client { uint8_t type; struct ether_addr mac_addr; } _packed_ client_id; + uint8_t mac_addr[MAX_MAC_ADDR_LEN]; + size_t mac_addr_len; + uint16_t arp_type; char *hostname; char *vendor_class_identifier; uint32_t mtu; @@ -163,15 +169,25 @@ int sd_dhcp_client_set_index(sd_dhcp_client *client, int interface_index) { return 0; } -int sd_dhcp_client_set_mac(sd_dhcp_client *client, - const struct ether_addr *addr) { +int sd_dhcp_client_set_mac(sd_dhcp_client *client, const uint8_t *addr, + size_t addr_len, uint16_t arp_type) { DHCP_CLIENT_DONT_DESTROY(client); bool need_restart = false; assert_return(client, -EINVAL); 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 + return -EINVAL; - if (memcmp(&client->client_id.mac_addr, addr, ETH_ALEN) == 0) + if (client->mac_addr_len == addr_len && + memcmp(&client->mac_addr, addr, addr_len) == 0) return 0; if (!IN_SET(client->state, DHCP_STATE_INIT, DHCP_STATE_STOPPED)) { @@ -181,6 +197,10 @@ int sd_dhcp_client_set_mac(sd_dhcp_client *client, client_stop(client, DHCP_EVENT_STOP); } + memcpy(&client->mac_addr, addr, addr_len); + client->mac_addr_len = addr_len; + client->arp_type = arp_type; + memcpy(&client->client_id.mac_addr, addr, ETH_ALEN); client->client_id.type = 0x01; @@ -318,7 +338,7 @@ static int client_message_init(sd_dhcp_client *client, DHCPPacket **ret, return -ENOMEM; r = dhcp_message_init(&packet->dhcp, BOOTREQUEST, client->xid, type, - optlen, &optoffset); + client->arp_type, optlen, &optoffset); if (r < 0) return r; @@ -337,14 +357,17 @@ static int client_message_init(sd_dhcp_client *client, DHCPPacket **ret, Note: some interfaces needs this to be enabled, but some networks needs this to be disabled as broadcasts are filteretd, so this needs to be configurable */ - if (client->request_broadcast) + if (client->request_broadcast || client->arp_type != ARPHRD_ETHER) packet->dhcp.flags = htobe16(0x8000); /* RFC2132 section 4.1.1: The client MUST include its hardware address in the ’chaddr’ field, if - necessary for delivery of DHCP reply messages. + necessary for delivery of DHCP reply messages. Non-Ethernet + interfaces will leave 'chaddr' empty and use the client identifier + instead (eg, RFC 4390 section 2.1). */ - memcpy(&packet->dhcp.chaddr, &client->client_id.mac_addr, ETH_ALEN); + if (client->arp_type == ARPHRD_ETHER) + memcpy(&packet->dhcp.chaddr, &client->mac_addr, ETH_ALEN); /* Some DHCP servers will refuse to issue an DHCP lease if the Client Identifier option is not set */ @@ -843,7 +866,9 @@ static int client_start(sd_dhcp_client *client) { client->xid = random_u32(); - r = dhcp_network_bind_raw_socket(client->index, &client->link, client->xid, client->client_id.mac_addr); + r = dhcp_network_bind_raw_socket(client->index, &client->link, + client->xid, client->mac_addr, + client->mac_addr_len, client->arp_type); if (r < 0) { client_stop(client, r); return r; @@ -887,7 +912,9 @@ static int client_timeout_t2(sd_event_source *s, uint64_t usec, void *userdata) client->state = DHCP_STATE_REBINDING; client->attempt = 1; - r = dhcp_network_bind_raw_socket(client->index, &client->link, client->xid, client->client_id.mac_addr); + r = dhcp_network_bind_raw_socket(client->index, &client->link, + client->xid, client->mac_addr, + client->mac_addr_len, client->arp_type); if (r < 0) { client_stop(client, r); return 0; @@ -1331,6 +1358,9 @@ static int client_receive_message_udp(sd_event_source *s, int fd, sd_dhcp_client *client = userdata; _cleanup_free_ DHCPMessage *message = NULL; int buflen = 0, len, r; + const struct ether_addr zero_mac = { { 0, 0, 0, 0, 0, 0 } }; + const struct ether_addr *expected_chaddr = NULL; + uint8_t expected_hlen = 0; assert(s); assert(client); @@ -1367,13 +1397,26 @@ static int client_receive_message_udp(sd_event_source *s, int fd, return 0; } - if (message->htype != ARPHRD_ETHER || message->hlen != ETHER_ADDR_LEN) { - log_dhcp_client(client, "not an ethernet packet"); + if (message->htype != client->arp_type) { + log_dhcp_client(client, "packet type does not match client type"); + return 0; + } + + if (client->arp_type == ARPHRD_ETHER) { + expected_hlen = ETH_ALEN; + expected_chaddr = (const struct ether_addr *) &client->mac_addr; + } else { + /* Non-ethernet links expect zero chaddr */ + expected_hlen = 0; + expected_chaddr = &zero_mac; + } + + if (message->hlen != expected_hlen) { + log_dhcp_client(client, "unexpected packet hlen %d", message->hlen); return 0; } - if (memcmp(&message->chaddr[0], &client->client_id.mac_addr, - ETH_ALEN)) { + if (memcmp(&message->chaddr[0], expected_chaddr, ETH_ALEN)) { log_dhcp_client(client, "received chaddr does not match " "expected: ignoring"); return 0; @@ -1455,7 +1498,6 @@ static int client_receive_message_raw(sd_event_source *s, int fd, } int sd_dhcp_client_start(sd_dhcp_client *client) { - char buffer[ETHER_ADDR_TO_STRING_MAX]; int r; assert_return(client, -EINVAL); @@ -1469,9 +1511,7 @@ int sd_dhcp_client_start(sd_dhcp_client *client) { r = client_start(client); if (r >= 0) - log_dhcp_client(client, "STARTED on ifindex %u with address %s", - client->index, - ether_addr_to_string(&client->client_id.mac_addr, buffer)); + log_dhcp_client(client, "STARTED on ifindex %u", client->index); return r; } |