I've had reports of UEFI platforms failing iSCSI boot in various configurations, that ended up being caused by network initialization scripts getting tripped up by unexpected null addresses (0.0.0.0) being reported for gateways, dhcp servers, and dns servers. The tianocore EDK2 iSCSI driver generates an iBFT table that always uses IPv4-mapped IPv6 addresses for the NIC structure fields. This results in values that are "not present or not specified" being reported as ::ffff:0.0.0.0 rather than all zeros as specified. The iscsi_ibft module filters unspecified fields from the iBFT from sysfs, preventing userspace from using invalid values and making it easy to check for the presence of a value. This currently fails in regard to these mapped null addresses. In order to remain consistent with how the iBFT information is exposed, we should accommodate the behavior of the tianocore iSCSI driver as it's already in the wild in a large number of servers. Tested under qemu using an OVMF build of tianocore EDK2.
Unified · Split
| @@ -186,8 +186,20 @@ struct ibft_kobject { · 185 unmodified lines | ||
| 186 | 186 | |
| 187 | 187 | static struct iscsi_boot_kset *boot_kset; |
| 188 | 188 | |
| 189 | +/* fully null address */ | |
| 189 | 190 | static const char nulls[16]; |
| 190 | 191 | |
| 192 | +/* IPv4-mapped IPv6 ::ffff:0.0.0.0 */ | |
| 193 | +static const char mapped_nulls[16] = { 0x00, 0x00, 0x00, 0x00, | |
| 194 | + 0x00, 0x00, 0x00, 0x00, | |
| 195 | + 0x00, 0x00, 0xff, 0xff, | |
| 196 | + 0x00, 0x00, 0x00, 0x00 }; | |
| 197 | + | |
| 198 | +static int address_not_null(u8 *ip) | |
| 199 | +{ | |
| 200 | + return (memcmp(ip, nulls, 16) && memcmp(ip, mapped_nulls, 16)); | |
| 201 | +} | |
| 202 | + | |
| 191 | 203 | /* |
| 192 | 204 | * Helper functions to parse data properly. |
| 193 | 205 | */ |
| @@ -445,7 +457,7 @@ static umode_t ibft_check_nic_for(void *data, int type) · 251 unmodified lines | ||
| 445 | 457 | rc = S_IRUGO; |
| 446 | 458 | break; |
| 447 | 459 | case ISCSI_BOOT_ETH_IP_ADDR: |
| 448 | − if (memcmp(nic->ip_addr, nulls, sizeof(nic->ip_addr))) | |
| 460 | + if (address_not_null(nic->ip_addr)) | |
| 449 | 461 | rc = S_IRUGO; |
| 450 | 462 | break; |
| 451 | 463 | case ISCSI_BOOT_ETH_SUBNET_MASK: |
| @@ -456,21 +468,19 @@ static umode_t ibft_check_nic_for(void *data, int type) · 4 unmodified lines | ||
| 456 | 468 | rc = S_IRUGO; |
| 457 | 469 | break; |
| 458 | 470 | case ISCSI_BOOT_ETH_GATEWAY: |
| 459 | − if (memcmp(nic->gateway, nulls, sizeof(nic->gateway))) | |
| 471 | + if (address_not_null(nic->gateway)) | |
| 460 | 472 | rc = S_IRUGO; |
| 461 | 473 | break; |
| 462 | 474 | case ISCSI_BOOT_ETH_PRIMARY_DNS: |
| 463 | − if (memcmp(nic->primary_dns, nulls, | |
| 464 | − sizeof(nic->primary_dns))) | |
| 475 | + if (address_not_null(nic->primary_dns)) | |
| 465 | 476 | rc = S_IRUGO; |
| 466 | 477 | break; |
| 467 | 478 | case ISCSI_BOOT_ETH_SECONDARY_DNS: |
| 468 | − if (memcmp(nic->secondary_dns, nulls, | |
| 469 | − sizeof(nic->secondary_dns))) | |
| 479 | + if (address_not_null(nic->secondary_dns)) | |
| 470 | 480 | rc = S_IRUGO; |
| 471 | 481 | break; |
| 472 | 482 | case ISCSI_BOOT_ETH_DHCP: |
| 473 | − if (memcmp(nic->dhcp, nulls, sizeof(nic->dhcp))) | |
| 483 | + if (address_not_null(nic->dhcp)) | |
| 474 | 484 | rc = S_IRUGO; |
| 475 | 485 | break; |
| 476 | 486 | case ISCSI_BOOT_ETH_VLAN: |
| @@ -536,23 +546,19 @@ static umode_t __init ibft_check_initiator_for(void *data, int type) · 59 unmodified lines | ||
| 536 | 546 | rc = S_IRUGO; |
| 537 | 547 | break; |
| 538 | 548 | case ISCSI_BOOT_INI_ISNS_SERVER: |
| 539 | − if (memcmp(init->isns_server, nulls, | |
| 540 | − sizeof(init->isns_server))) | |
| 549 | + if (address_not_null(init->isns_server)) | |
| 541 | 550 | rc = S_IRUGO; |
| 542 | 551 | break; |
| 543 | 552 | case ISCSI_BOOT_INI_SLP_SERVER: |
| 544 | − if (memcmp(init->slp_server, nulls, | |
| 545 | − sizeof(init->slp_server))) | |
| 553 | + if (address_not_null(init->slp_server)) | |
| 546 | 554 | rc = S_IRUGO; |
| 547 | 555 | break; |
| 548 | 556 | case ISCSI_BOOT_INI_PRI_RADIUS_SERVER: |
| 549 | − if (memcmp(init->pri_radius_server, nulls, | |
| 550 | − sizeof(init->pri_radius_server))) | |
| 557 | + if (address_not_null(init->pri_radius_server)) | |
| 551 | 558 | rc = S_IRUGO; |
| 552 | 559 | break; |
| 553 | 560 | case ISCSI_BOOT_INI_SEC_RADIUS_SERVER: |
| 554 | − if (memcmp(init->sec_radius_server, nulls, | |
| 555 | − sizeof(init->sec_radius_server))) | |
| 561 | + if (address_not_null(init->sec_radius_server)) | |
| 556 | 562 | rc = S_IRUGO; |
| 557 | 563 | break; |
| 558 | 564 | case ISCSI_BOOT_INI_INITIATOR_NAME: |