diff options
Diffstat (limited to 'src/systemd/src/libsystemd-network/sd-dhcp-client.c')
| -rw-r--r-- | src/systemd/src/libsystemd-network/sd-dhcp-client.c | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/src/systemd/src/libsystemd-network/sd-dhcp-client.c b/src/systemd/src/libsystemd-network/sd-dhcp-client.c index 20429306bd..27f7963890 100644 --- a/src/systemd/src/libsystemd-network/sd-dhcp-client.c +++ b/src/systemd/src/libsystemd-network/sd-dhcp-client.c @@ -1680,8 +1680,7 @@ static int client_receive_message_udp( sd_dhcp_client *client = userdata; _cleanup_free_ DHCPMessage *message = NULL; - const struct ether_addr zero_mac = {}; - const struct ether_addr *expected_chaddr = NULL; + const uint8_t *expected_chaddr = NULL; uint8_t expected_hlen = 0; ssize_t len, buflen; @@ -1689,6 +1688,12 @@ static int client_receive_message_udp( assert(client); buflen = next_datagram_size_fd(fd); + if (buflen == -ENETDOWN) { + /* the link is down. Don't return an error or the I/O event + source will be disconnected and we won't be able to receive + packets again when the link comes back. */ + return 0; + } if (buflen < 0) return buflen; @@ -1698,7 +1703,8 @@ static int client_receive_message_udp( len = recv(fd, message, buflen, 0); if (len < 0) { - if (IN_SET(errno, EAGAIN, EINTR)) + /* see comment above for why we shouldn't error out on ENETDOWN. */ + if (IN_SET(errno, EAGAIN, EINTR, ENETDOWN)) return 0; return log_dhcp_client_errno(client, errno, @@ -1726,11 +1732,7 @@ static int client_receive_message_udp( 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; + expected_chaddr = &client->mac_addr[0]; } if (message->hlen != expected_hlen) { @@ -1738,7 +1740,7 @@ static int client_receive_message_udp( return 0; } - if (memcmp(&message->chaddr[0], expected_chaddr, ETH_ALEN)) { + if (expected_hlen > 0 && memcmp(&message->chaddr[0], expected_chaddr, expected_hlen)) { log_dhcp_client(client, "Received chaddr does not match expected: ignoring"); return 0; } @@ -1780,6 +1782,8 @@ static int client_receive_message_raw( assert(client); buflen = next_datagram_size_fd(fd); + if (buflen == -ENETDOWN) + return 0; if (buflen < 0) return buflen; @@ -1791,7 +1795,7 @@ static int client_receive_message_raw( len = recvmsg(fd, &msg, 0); if (len < 0) { - if (IN_SET(errno, EAGAIN, EINTR)) + if (IN_SET(errno, EAGAIN, EINTR, ENETDOWN)) return 0; return log_dhcp_client_errno(client, errno, |