diff options
Diffstat (limited to 'src/ipcpd/normal/dt_pci.c')
| -rw-r--r-- | src/ipcpd/normal/dt_pci.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/src/ipcpd/normal/dt_pci.c b/src/ipcpd/normal/dt_pci.c new file mode 100644 index 00000000..0e596803 --- /dev/null +++ b/src/ipcpd/normal/dt_pci.c @@ -0,0 +1,149 @@ +/* + * Ouroboros - Copyright (C) 2016 - 2017 + * + * Protocol Control Information of Data Transfer AE + * + * Dimitri Staessens <dimitri.staessens@ugent.be> + * Sander Vrijders <sander.vrijders@ugent.be> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <ouroboros/config.h> +#include <ouroboros/errno.h> +#include <ouroboros/crc32.h> +#include <ouroboros/rib.h> + +#include "dt_const.h" +#include "dt_pci.h" +#include "ribconfig.h" + +#include <stdlib.h> +#include <string.h> +#include <assert.h> + +#define PDU_TYPE_SIZE 1 +#define QC_SIZE 1 +#define DEFAULT_TTL 60 +#define TTL_SIZE 1 +#define CHK_SIZE 4 + +struct { + struct dt_const dtc; + size_t head_size; + size_t tail_size; + + /* offsets */ + size_t qc_o; + size_t ttl_o; + size_t pdu_type_o; +} dt_pci_info; + +int dt_pci_init(void) +{ + /* read dt constants from the RIB */ + if (rib_read(BOOT_PATH "/dt/const/addr_size", + &dt_pci_info.dtc.addr_size, + sizeof(dt_pci_info.dtc.addr_size)) < 0 || + rib_read(BOOT_PATH "/dt/const/has_ttl", + &dt_pci_info.dtc.has_ttl, + sizeof(dt_pci_info.dtc.has_ttl)) < 0 || + rib_read(BOOT_PATH "/dt/const/has_chk", + &dt_pci_info.dtc.has_chk, + sizeof(dt_pci_info.dtc.has_chk)) < 0) + return -1; + + dt_pci_info.qc_o = dt_pci_info.dtc.addr_size; + dt_pci_info.ttl_o = dt_pci_info.qc_o + QC_SIZE; + + dt_pci_info.head_size = dt_pci_info.ttl_o + PDU_TYPE_SIZE; + + if (dt_pci_info.dtc.has_ttl) + dt_pci_info.head_size += TTL_SIZE; + + dt_pci_info.tail_size = dt_pci_info.dtc.has_chk ? CHK_SIZE : 0; + + return 0; +} + +void dt_pci_fini(void) { + return; +} + +int dt_pci_ser(struct shm_du_buff * sdb, + struct dt_pci * dt_pci) +{ + uint8_t * head; + uint8_t * tail; + uint8_t ttl = DEFAULT_TTL; + + assert(sdb); + assert(dt_pci); + + head = shm_du_buff_head_alloc(sdb, dt_pci_info.head_size); + if (head == NULL) + return -EPERM; + + /* FIXME: Add check and operations for Big Endian machines */ + memcpy(head, &dt_pci->dst_addr, dt_pci_info.dtc.addr_size); + memcpy(head + dt_pci_info.qc_o, &dt_pci->qc, QC_SIZE); + if (dt_pci_info.dtc.has_ttl) + memcpy(head + dt_pci_info.ttl_o, &ttl, TTL_SIZE); + memcpy(head + dt_pci_info.pdu_type_o, &dt_pci->pdu_type, PDU_TYPE_SIZE); + + if (dt_pci_info.dtc.has_chk) { + tail = shm_du_buff_tail_alloc(sdb, dt_pci_info.tail_size); + if (tail == NULL) { + shm_du_buff_head_release(sdb, dt_pci_info.head_size); + return -EPERM; + } + + *((uint32_t *) tail) = 0; + crc32((uint32_t *) tail, head, tail - head); + } + + return 0; +} + +void dt_pci_des(struct shm_du_buff * sdb, + struct dt_pci * dt_pci) +{ + uint8_t * head; + + assert(sdb); + assert(dt_pci); + + head = shm_du_buff_head(sdb); + + /* FIXME: Add check and operations for Big Endian machines */ + memcpy(&dt_pci->dst_addr, head, dt_pci_info.dtc.addr_size); + memcpy(&dt_pci->qc, head + dt_pci_info.qc_o, QC_SIZE); + + if (dt_pci_info.dtc.has_ttl) { + --*(head + dt_pci_info.ttl_o); /* decrease TTL */ + memcpy(&dt_pci->ttl, head + dt_pci_info.ttl_o, TTL_SIZE); + } else { + dt_pci->ttl = 1; + } + + memcpy(&dt_pci->pdu_type, head + dt_pci_info.pdu_type_o, PDU_TYPE_SIZE); +} + +void dt_pci_shrink(struct shm_du_buff * sdb) +{ + assert(sdb); + + shm_du_buff_head_release(sdb, dt_pci_info.head_size); + shm_du_buff_tail_release(sdb, dt_pci_info.tail_size); +} |