/* FIXME this won't work with TCP or IPv4 data, which is probably a bug */
libnet_ptag_t
libnet_build_data(const uint8_t *payload, uint32_t payload_s, libnet_t *l,
libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
if (l == NULL)
{
return (-1);
}
n = payload_s;
h = 0; /* no checksum on generic block */
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_DATA_H);
if (p == NULL)
{
return (-1);
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_DATA_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ospfv2(uint16_t len, uint8_t type, uint32_t rtr_id,
uint32_t area_id, uint16_t sum, uint16_t autype, const uint8_t *payload,
uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_ospf_hdr ospf_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_OSPF_H + payload_s;
h = LIBNET_OSPF_H + payload_s + len;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_OSPF_H);
if (p == NULL)
{
return (-1);
}
memset(&ospf_hdr, 0, sizeof(ospf_hdr));
ospf_hdr.ospf_v = 2; /* OSPF version 2 */
ospf_hdr.ospf_type = type; /* Type of pkt */
ospf_hdr.ospf_len = htons(h); /* Pkt len */
ospf_hdr.ospf_rtr_id.s_addr = rtr_id; /* Router ID */
ospf_hdr.ospf_area_id.s_addr = area_id; /* Area ID */
ospf_hdr.ospf_sum = sum;
ospf_hdr.ospf_auth_type = htons(autype); /* Type of auth */
n = libnet_pblock_append(l, p, (uint8_t *)&ospf_hdr, LIBNET_OSPF_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
if (sum == 0)
{
/*
* If checksum is zero, by default libnet will compute a checksum
* for the user. The programmer can override this by calling
* libnet_toggle_checksum(l, ptag, 1);
*/
libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
}
return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_OSPF_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_igmp(uint8_t type, uint8_t code, uint16_t sum, uint32_t ip,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_igmp_hdr igmp_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_IGMP_H + payload_s;
h = LIBNET_IGMP_H;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_IGMP_H);
if (p == NULL)
{
return (-1);
}
memset(&igmp_hdr, 0, sizeof(igmp_hdr));
igmp_hdr.igmp_type = type; /* packet type */
igmp_hdr.igmp_code = code; /* packet code */
igmp_hdr.igmp_sum = (sum ? htons(sum) : 0); /* packet checksum */
igmp_hdr.igmp_group.s_addr = htonl(ip);
n = libnet_pblock_append(l, p, (uint8_t *)&igmp_hdr, LIBNET_IGMP_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
if (sum == 0)
{
/*
* If checksum is zero, by default libnet will compute a checksum
* for the user. The programmer can override this by calling
* libnet_toggle_checksum(l, ptag, 1);
*/
libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
}
return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_IGMP_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_isl(uint8_t *dhost, uint8_t type, uint8_t user,
uint8_t *shost, uint16_t len, uint8_t *snap, uint16_t vid,
uint16_t portindex, uint16_t reserved, const uint8_t *payload,
uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_isl_hdr isl_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_ISL_H + payload_s; /* size of memory block */
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ISL_H);
if (p == NULL)
{
return (-1);
}
memset(&isl_hdr, 0, sizeof (isl_hdr));
memcpy(&isl_hdr.isl_dhost, dhost, 5);
isl_hdr.isl_type = type;
isl_hdr.isl_user = user;
memcpy(&isl_hdr.isl_shost, shost, 6);
isl_hdr.isl_len = htons(len);
memcpy(&isl_hdr.isl_dhost, snap, 6);
isl_hdr.isl_vid = htons(vid);
isl_hdr.isl_index = htons(portindex);
isl_hdr.isl_reserved= htons(reserved);
n = libnet_pblock_append(l, p, (uint8_t *)&isl_hdr, LIBNET_ISL_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
/* we need to compute the CRC for the ethernet frame and the ISL frame */
libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
return (ptag ? ptag : libnet_pblock_update(l, p, LIBNET_ISL_H,
LIBNET_PBLOCK_ISL_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ethernet(const uint8_t *dst, const uint8_t *src, uint16_t type,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_ethernet_hdr eth_hdr;
if (l == NULL)
{
return (-1);
}
/* sanity check injection type if we're not in advanced mode */
if (l->injection_type != LIBNET_LINK &&
!(((l->injection_type) & LIBNET_ADV_MASK)))
{
snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
"%s(): called with non-link layer wire injection primitive",
__func__);
p = NULL;
goto bad;
}
n = LIBNET_ETH_H + payload_s;
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ETH_H);
if (p == NULL)
{
return (-1);
}
memset(ð_hdr, 0, sizeof(eth_hdr));
memcpy(eth_hdr.ether_dhost, dst, ETHER_ADDR_LEN); /* destination address */
memcpy(eth_hdr.ether_shost, src, ETHER_ADDR_LEN); /* source address */
eth_hdr.ether_type = htons(type); /* packet type */
n = libnet_pblock_append(l, p, (uint8_t *)ð_hdr, LIBNET_ETH_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_ETH_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_sebek(uint32_t magic, uint16_t version, uint16_t type,
uint32_t counter, uint32_t time_sec, uint32_t time_usec, uint32_t pid,
uint32_t uid, uint32_t fd, uint8_t cmd[SEBEK_CMD_LENGTH], uint32_t length,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n;
libnet_pblock_t *p;
struct libnet_sebek_hdr sebek_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_SEBEK_H + payload_s; /* size of memory block */
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_SEBEK_H);
if (p == NULL)
{
return (-1);
}
memset(&sebek_hdr, 0, sizeof(sebek_hdr));
sebek_hdr.magic = htonl(magic);
sebek_hdr.version = htons(version);
sebek_hdr.type = htons(type);
sebek_hdr.counter = htonl(counter);
sebek_hdr.time_sec = htonl(time_sec);
sebek_hdr.time_usec = htonl(time_usec);
sebek_hdr.pid = htonl(pid);
sebek_hdr.uid = htonl(uid);
sebek_hdr.fd = htonl(fd);
memcpy(sebek_hdr.cmd, cmd, SEBEK_CMD_LENGTH*sizeof(uint8_t));
sebek_hdr.length = htonl(length);
n = libnet_pblock_append(l, p, (uint8_t *)&sebek_hdr, LIBNET_SEBEK_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, 0, LIBNET_PBLOCK_SEBEK_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_rip(uint8_t cmd, uint8_t version, uint16_t rd, uint16_t af,
uint16_t rt, uint32_t addr, uint32_t mask, uint32_t next_hop,
uint32_t metric, const uint8_t *payload, uint32_t payload_s, libnet_t *l,
libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_rip_hdr rip_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_RIP_H + payload_s;
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_RIP_H);
if (p == NULL)
{
return (-1);
}
memset(&rip_hdr, 0, sizeof(rip_hdr));
rip_hdr.rip_cmd = cmd;
rip_hdr.rip_ver = version;
rip_hdr.rip_rd = htons(rd);
rip_hdr.rip_af = htons(af);
rip_hdr.rip_rt = htons(rt);
rip_hdr.rip_addr = addr;
rip_hdr.rip_mask = mask;
rip_hdr.rip_next_hop = next_hop;
rip_hdr.rip_metric = htonl(metric);
n = libnet_pblock_append(l, p, (uint8_t *)&rip_hdr, LIBNET_RIP_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_RIP_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ospfv2_lsa_rtr(uint16_t flags, uint16_t num, uint32_t id,
uint32_t data, uint8_t type, uint8_t tos, uint16_t metric,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_rtr_lsa_hdr rtr_lsa_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_OSPF_LS_RTR_H + payload_s;
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_LS_RTR_H);
if (p == NULL)
{
return (-1);
}
memset(&rtr_lsa_hdr, 0, sizeof(rtr_lsa_hdr));
rtr_lsa_hdr.rtr_flags = htons(flags);
rtr_lsa_hdr.rtr_num = htons(num);
rtr_lsa_hdr.rtr_link_id = htonl(id);
rtr_lsa_hdr.rtr_link_data = htonl(data);
rtr_lsa_hdr.rtr_type = type;
rtr_lsa_hdr.rtr_tos_num = tos;
rtr_lsa_hdr.rtr_metric = htons(metric);
n = libnet_pblock_append(l, p, (uint8_t *)&rtr_lsa_hdr,
LIBNET_OSPF_LS_RTR_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_LS_RTR_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ospfv2_hello(uint32_t netmask, uint16_t interval, uint8_t opts,
uint8_t priority, uint32_t dead_int, uint32_t des_rtr, uint32_t bkup_rtr,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_ospf_hello_hdr hello_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_OSPF_HELLO_H + payload_s;
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_OSPF_HELLO_H);
if (p == NULL)
{
return (-1);
}
memset(&hello_hdr, 0, sizeof(hello_hdr));
hello_hdr.hello_nmask.s_addr = netmask; /* Netmask */
hello_hdr.hello_intrvl = htons(interval); /* # seconds since last packet sent */
hello_hdr.hello_opts = opts; /* OSPF_* options */
hello_hdr.hello_rtr_pri = priority; /* If 0, can't be backup */
hello_hdr.hello_dead_intvl = htonl(dead_int); /* Time til router is deemed down */
hello_hdr.hello_des_rtr.s_addr = des_rtr; /* Networks designated router */
hello_hdr.hello_bkup_rtr.s_addr = bkup_rtr; /* Networks backup router */
/*hello_hdr.hello_nbr.s_addr = htonl(neighbor); */
n = libnet_pblock_append(l, p, (uint8_t *)&hello_hdr, LIBNET_OSPF_HELLO_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_OSPF_HELLO_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ipsec_ah(uint8_t nh, uint8_t len, uint16_t res,
uint32_t spi, uint32_t seq, uint32_t auth, const uint8_t *payload,
uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_ah_hdr ah_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_IPSEC_AH_H + payload_s;/* size of memory block */
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_IPSEC_AH_H);
if (p == NULL)
{
return (-1);
}
memset(&ah_hdr, 0, sizeof(ah_hdr));
ah_hdr.ah_nh = nh; /* next header */
ah_hdr.ah_len = len; /* length */
ah_hdr.ah_res = (res ? htons(res) : 0);
ah_hdr.ah_spi = htonl(spi); /* SPI */
ah_hdr.ah_seq = htonl(seq); /* AH sequence number */
ah_hdr.ah_auth = htonl(auth); /* authentication data */
n = libnet_pblock_append(l, p, (uint8_t *)&ah_hdr, LIBNET_IPSEC_AH_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_IPSEC_AH_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ospfv2_lsa_as(uint32_t nmask, uint32_t metric, uint32_t fwdaddr,
uint32_t tag, const uint8_t *payload, uint32_t payload_s, libnet_t *l,
libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_as_lsa_hdr as_lsa_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_OSPF_LS_AS_EXT_H + payload_s;
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_LS_AS_EXT_H);
if (p == NULL)
{
return (-1);
}
memset(&as_lsa_hdr, 0, sizeof(as_lsa_hdr));
as_lsa_hdr.as_nmask.s_addr = htonl(nmask);
as_lsa_hdr.as_metric = htonl(metric);
as_lsa_hdr.as_fwd_addr.s_addr = htonl(fwdaddr);
as_lsa_hdr.as_rte_tag = htonl(tag);
n = libnet_pblock_append(l, p, (uint8_t *)&as_lsa_hdr,
LIBNET_OSPF_LS_AS_EXT_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_LS_AS_EXT_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ipsec_esp_ftr(uint8_t len, uint8_t nh, int8_t *auth,
const uint8_t *payload, uint32_t payload_s, libnet_t *l,
libnet_ptag_t ptag)
{
/* XXX we need to know the size of auth */
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_esp_ftr esp_ftr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_IPSEC_ESP_FTR_H + payload_s;/* size of memory block */
h = 0;
memset(&esp_ftr, 0, sizeof(esp_ftr));
esp_ftr.esp_pad_len = len; /* pad length */
esp_ftr.esp_nh = nh; /* next header pointer */
esp_ftr.esp_auth = auth; /* authentication data */
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_IPSEC_ESP_FTR_H);
if (p == NULL)
{
return (-1);
}
n = libnet_pblock_append(l, p, (uint8_t *)&esp_ftr, LIBNET_IPSEC_ESP_FTR_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_IPSEC_ESP_FTR_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ospfv2_dbd(uint16_t dgram_len, uint8_t opts, uint8_t type,
uint32_t seqnum, const uint8_t *payload, uint32_t payload_s, libnet_t *l,
libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_dbd_hdr dbd_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_OSPF_DBD_H + payload_s;
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_OSPF_DBD_H);
if (p == NULL)
{
return (-1);
}
memset(&dbd_hdr, 0, sizeof(dbd_hdr));
dbd_hdr.dbd_mtu_len = htons(dgram_len); /* Max length of IP packet IF can use */
dbd_hdr.dbd_opts = opts; /* OSPF_* options */
dbd_hdr.dbd_type = type; /* Type of exchange occuring */
dbd_hdr.dbd_seq = htonl(seqnum); /* DBD sequence number */
n = libnet_pblock_append(l, p, (uint8_t *)&dbd_hdr, LIBNET_OSPF_DBD_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_OSPF_DBD_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ospfv2_lsr(uint32_t type, uint32_t lsid, uint32_t advrtr,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_lsr_hdr lsr_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_OSPF_LSR_H + payload_s;
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_OSPF_LSR_H);
if (p == NULL)
{
return (-1);
}
memset(&lsr_hdr, 0, sizeof(lsr_hdr));
lsr_hdr.lsr_type = htonl(type); /* Type of LS being requested */
lsr_hdr.lsr_lsid = htonl(lsid); /* Link State ID */
lsr_hdr.lsr_adrtr.s_addr = htonl(advrtr); /* Advertising router */
n = libnet_pblock_append(l, p, (uint8_t *)&lsr_hdr, LIBNET_OSPF_LSR_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_OSPF_LSR_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ipsec_esp_hdr(uint32_t spi, uint32_t seq, uint32_t iv,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_esp_hdr esp_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_IPSEC_ESP_HDR_H + payload_s;/* size of memory block */
h = 0;
memset(&esp_hdr, 0, sizeof(esp_hdr));
esp_hdr.esp_spi = htonl(spi); /* SPI */
esp_hdr.esp_seq = htonl(seq); /* ESP sequence number */
esp_hdr.esp_iv = htonl(iv); /* initialization vector */
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_IPSEC_ESP_HDR_H);
if (p == NULL)
{
return (-1);
}
n = libnet_pblock_append(l, p, (uint8_t *)&esp_hdr, LIBNET_IPSEC_ESP_HDR_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_IPSEC_ESP_HDR_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_802_1x(uint8_t eap_ver, uint8_t eap_type, uint16_t length,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_802_1x_hdr dot1x_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_802_1X_H + payload_s;
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_802_1X_H);
if (p == NULL)
{
return (-1);
}
memset(&dot1x_hdr, 0, sizeof(dot1x_hdr));
dot1x_hdr.dot1x_version = eap_ver;
dot1x_hdr.dot1x_type = eap_type;
dot1x_hdr.dot1x_length = htons(length);
n = libnet_pblock_append(l, p, (uint8_t *)&dot1x_hdr, LIBNET_802_1X_H);
if (n == (uint32_t)-1)
{
goto bad;
}
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_802_1X_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ospfv2_lsu(uint32_t num, const uint8_t *payload, uint32_t payload_s,
libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_lsu_hdr lh_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_OSPF_LSU_H + payload_s;
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_OSPF_LSU_H);
if (p == NULL)
{
return (-1);
}
memset(&lh_hdr, 0, sizeof(lh_hdr));
lh_hdr.lsu_num = htonl(num); /* Number of LSAs that will be bcasted */
n = libnet_pblock_append(l, p, (uint8_t *)&lh_hdr, LIBNET_OSPF_LSU_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_OSPF_LSU_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_cdp(uint8_t version, uint8_t ttl, uint16_t sum, uint16_t type,
uint16_t len, const uint8_t *value, const uint8_t *payload, uint32_t payload_s,
libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n,h;
libnet_pblock_t *p;
struct libnet_cdp_hdr cdp_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_CDP_H + LIBNET_CDP_H + len + payload_s;
h = LIBNET_CDP_H + LIBNET_CDP_H + len + payload_s;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_CDP_H);
if (p == NULL)
{
return (-1);
}
memset(&cdp_hdr, 0, sizeof(cdp_hdr));
cdp_hdr.cdp_version = version;
cdp_hdr.cdp_ttl = ttl;
cdp_hdr.cdp_sum = (sum ? htons(sum) : 0);
cdp_hdr.cdp_type = htons(type);
cdp_hdr.cdp_len = htons(len + 4); /* 4 bytes for len and type */
n = libnet_pblock_append(l, p, (uint8_t *)&cdp_hdr, LIBNET_CDP_H);
if (n == -1)
{
goto bad;
}
n = libnet_pblock_append(l, p, value, len);
if (n == -1)
{
/* err msg set in libnet_pblock_append() */
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
if (sum == 0)
{
/*
* If checksum is zero, by default libnet will compute a checksum
* for the user. The programmer can override this by calling
* libnet_toggle_checksum(l, ptag, 1);
*/
libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
}
return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_CDP_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
/*
* Routing (variable)
*
* The Routing field is optional and is present only if the Routing
* Present bit is set to 1.
*
* The Routing field is a list of Source Route Entries (SREs). Each
* SRE has the form:
*
* 0 1 2 3
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Address Family | SRE Offset | SRE Length |
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
* | Routing Information ...
* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
*
*/
libnet_ptag_t
libnet_build_gre_sre(uint16_t af, uint8_t offset, uint8_t length,
uint8_t *routing, const uint8_t *payload, uint32_t payload_s, libnet_t *l,
libnet_ptag_t ptag)
{
uint32_t n;
libnet_pblock_t *p;
struct libnet_gre_sre_hdr sre_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_GRE_SRE_H + length + payload_s;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_GRE_SRE_H);
if (p == NULL)
{
return (-1);
}
sre_hdr.af = htons(af);
sre_hdr.sre_offset = offset;
sre_hdr.sre_length = length;
n = libnet_pblock_append(l, p, (uint8_t *)&sre_hdr, LIBNET_GRE_SRE_H);
if (n == -1)
{
/* err msg set in libnet_pblock_append() */
goto bad;
}
if ((routing && !length) || (!routing && length))
{
sprintf(l->err_buf, "%s(): routing inconsistency\n", __func__);
goto bad;
}
if (routing && length)
{
n = libnet_pblock_append(l, p, routing, length);
if (n == -1)
{
/* err msg set in libnet_pblock_append() */
goto bad;
}
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, 0,
LIBNET_PBLOCK_GRE_SRE_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_gre(uint16_t fv, uint16_t type, uint16_t sum,
uint16_t offset, uint32_t key, uint32_t seq, uint16_t len,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n;
libnet_pblock_t *p;
struct libnet_gre_hdr gre_hdr;
if (l == NULL)
{
return (-1);
}
n = libnet_getgre_length(fv) + payload_s;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_GRE_H);
if (p == NULL)
{
return (-1);
}
gre_hdr.flags_ver = htons(fv);
gre_hdr.type = htons(type);
n = libnet_pblock_append(l, p, (uint8_t *)&gre_hdr, LIBNET_GRE_H);
if (n == -1)
{
/* err msg set in libnet_pblock_append() */
goto bad;
}
if ((!(fv & GRE_VERSION_MASK) && (fv & (GRE_CSUM|GRE_ROUTING))) || /* v0 */
(fv & GRE_VERSION_MASK)) /* v1 */
{
sum = htons(sum);
n = libnet_pblock_append(l, p, (uint8_t*)&sum,
sizeof(gre_hdr.gre_sum));
if (n == -1)
{
/* err msg set in libnet_pblock_append() */
goto bad;
}
offset = htons(offset);
n = libnet_pblock_append(l, p, (uint8_t*)&offset,
sizeof(gre_hdr.gre_offset));
if (n == -1)
{
/* err msg set in libnet_pblock_append() */
goto bad;
}
}
if ((!(fv & GRE_VERSION_MASK) && (fv & GRE_KEY)) || /* v0 */
( (fv & GRE_VERSION_MASK) && (fv & GRE_SEQ)) ) /* v1 */
{
key = htonl(key);
n = libnet_pblock_append(l, p, (uint8_t*)&key,
sizeof(gre_hdr.gre_key));
if (n == -1)
{
/* err msg set in libnet_pblock_append() */
goto bad;
}
}
if ((!(fv & GRE_VERSION_MASK) && (fv & GRE_SEQ)) || /* v0 */
( (fv & GRE_VERSION_MASK) && (fv & GRE_ACK)) ) /* v1 */
{
seq = htonl(seq);
n = libnet_pblock_append(l, p, (uint8_t*)&seq,
sizeof(gre_hdr.gre_seq));
if (n == -1)
{
/* err msg set in libnet_pblock_append() */
goto bad;
}
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
if ( (fv & GRE_CSUM) && (!sum) )
{
libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
}
return (ptag ? ptag : libnet_pblock_update(l, p, len, LIBNET_PBLOCK_GRE_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_arp(uint16_t hrd, uint16_t pro, uint8_t hln, uint8_t pln,
uint16_t op, const uint8_t *sha, const uint8_t *spa, const uint8_t *tha, const uint8_t *tpa,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_arp_hdr arp_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_ARP_H + (2 * hln) + (2 * pln) + payload_s;
h = 0; /* ARP headers have no checksum */
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_ARP_H);
if (p == NULL)
{
return (-1);
}
memset(&arp_hdr, 0, sizeof(arp_hdr));
arp_hdr.ar_hrd = htons(hrd); /* hardware address type */
arp_hdr.ar_pro = htons(pro); /* protocol address type */
arp_hdr.ar_hln = hln; /* hardware address length */
arp_hdr.ar_pln = pln; /* protocol address length */
arp_hdr.ar_op = htons(op); /* opcode command */
n = libnet_pblock_append(l, p, (uint8_t *)&arp_hdr, LIBNET_ARP_H);
if (n == -1)
{
/* err msg set in libnet_pblock_append() */
goto bad;
}
n = libnet_pblock_append(l, p, sha, hln);
if (n == -1)
{
/* err msg set in libnet_pblock_append() */
goto bad;
}
n = libnet_pblock_append(l, p, spa, pln);
if (n == -1)
{
/* err msg set in libnet_pblock_append() */
goto bad;
}
n = libnet_pblock_append(l, p, tha, hln);
if (n == -1)
{
/* err msg set in libnet_pblock_append() */
goto bad;
}
n = libnet_pblock_append(l, p, tpa, pln);
if (n == -1)
{
/* err msg set in libnet_pblock_append() */
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_ARP_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ntp(uint8_t leap_indicator, uint8_t version, uint8_t mode,
uint8_t stratum, uint8_t poll, uint8_t precision, uint16_t delay_int,
uint16_t delay_frac, uint16_t dispersion_int, uint16_t dispersion_frac,
uint32_t reference_id, uint32_t ref_ts_int, uint32_t ref_ts_frac,
uint32_t orig_ts_int, uint32_t orig_ts_frac, uint32_t rec_ts_int,
uint32_t rec_ts_frac, uint32_t xmt_ts_int, uint32_t xmt_ts_frac,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_ntp_hdr ntp_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_NTP_H + payload_s;
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_NTP_H);
if (p == NULL)
{
return (-1);
}
memset(&ntp_hdr, 0, sizeof(ntp_hdr));
ntp_hdr.ntp_li_vn_mode = LIBNET_NTP_DO_LI_VN_MODE(
leap_indicator, version, mode);
ntp_hdr.ntp_stratum = stratum;
ntp_hdr.ntp_poll = poll;
ntp_hdr.ntp_precision = precision;
ntp_hdr.ntp_delay.integer = htons(delay_int);
ntp_hdr.ntp_delay.fraction = htons(delay_frac);
ntp_hdr.ntp_dispersion.integer = htons(dispersion_int);
ntp_hdr.ntp_dispersion.fraction = htons(dispersion_frac);
ntp_hdr.ntp_reference_id = htonl(reference_id);
ntp_hdr.ntp_ref_ts.integer = htonl(ref_ts_int);
ntp_hdr.ntp_ref_ts.fraction = htonl(ref_ts_frac);
ntp_hdr.ntp_orig_ts.integer = htonl(orig_ts_int);
ntp_hdr.ntp_orig_ts.fraction = htonl(orig_ts_frac);
ntp_hdr.ntp_rec_ts.integer = htonl(rec_ts_int);
ntp_hdr.ntp_rec_ts.fraction = htonl(rec_ts_frac);
ntp_hdr.ntp_xmt_ts.integer = htonl(xmt_ts_int);
ntp_hdr.ntp_xmt_ts.fraction = htonl(xmt_ts_frac);
n = libnet_pblock_append(l, p, (uint8_t *)&ntp_hdr, LIBNET_NTP_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_NTP_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_rpc_call(u_int32_t rm, u_int32_t xid, u_int32_t prog_num,
u_int32_t prog_vers, u_int32_t procedure, u_int32_t cflavor, u_int32_t clength,
u_int8_t *cdata, u_int32_t vflavor, u_int32_t vlength, u_int8_t *vdata,
u_int8_t *payload, u_int32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
u_int32_t n, h;
libnet_pblock_t *p;
struct libnet_rpc_call_tcp_hdr rpc_hdr;
if (l == NULL)
{
return (-1);
}
/* Credential and Verifier buffers not yet implemented.
* n = LIBNET_RPC_CALL_H + clength + vlength + payload_s;
*/
if (rm)
{
n = LIBNET_RPC_CALL_TCP_H + payload_s;
}
else
{
n = LIBNET_RPC_CALL_H + payload_s;
}
h = 0;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_RPC_CALL_H);
if (p == NULL)
{
return (-1);
}
memset(&rpc_hdr, 0, sizeof(rpc_hdr));
if (rm)
{
rpc_hdr.rpc_record_marking = htonl(rm + payload_s);
}
rpc_hdr.rpc_common.rpc_xid = htonl(xid);
rpc_hdr.rpc_common.rpc_type = LIBNET_RPC_CALL;
rpc_hdr.rpc_common.rpc_call.rpc_rpcvers = htonl(LIBNET_RPC_VERS);
rpc_hdr.rpc_common.rpc_call.rpc_prognum = htonl(prog_num);
rpc_hdr.rpc_common.rpc_call.rpc_vers = htonl(prog_vers);
rpc_hdr.rpc_common.rpc_call.rpc_procedure = htonl(procedure);
/* XXX Eventually should allow for opaque auth data. */
rpc_hdr.rpc_common.rpc_call.rpc_credentials.rpc_auth_flavor= htonl(cflavor);
rpc_hdr.rpc_common.rpc_call.rpc_credentials.rpc_auth_length= htonl(clength);
rpc_hdr.rpc_common.rpc_call.rpc_verifier.rpc_auth_flavor = htonl(vflavor);
rpc_hdr.rpc_common.rpc_call.rpc_verifier.rpc_auth_length = htonl(vlength);
if (rm)
{
n = libnet_pblock_append(l, p, (u_int8_t *)&rpc_hdr,
LIBNET_RPC_CALL_TCP_H);
}
else
{
n = libnet_pblock_append(l, p, (u_int8_t *)&rpc_hdr.rpc_common,
LIBNET_RPC_CALL_H);
}
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_RPC_CALL_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_dnsv4(uint16_t h_len, uint16_t id, uint16_t flags,
uint16_t num_q, uint16_t num_anws_rr, uint16_t num_auth_rr,
uint16_t num_addi_rr, const uint8_t *payload, uint32_t payload_s,
libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
uint offset;
libnet_pblock_t *p;
struct libnet_dnsv4_hdr dns_hdr;
if (l == NULL)
{
return (-1);
}
if (h_len != LIBNET_UDP_DNSV4_H && h_len != LIBNET_TCP_DNSV4_H)
{
snprintf(l->err_buf, LIBNET_ERRBUF_SIZE,
"%s(): invalid header length: %d", __func__, h_len);
return (-1);
}
offset = (h_len == LIBNET_UDP_DNSV4_H ? sizeof(dns_hdr.h_len) : 0);
n = h_len + payload_s;
h = 0; /* no checksum */
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_DNSV4_H);
if (p == NULL)
{
return (-1);
}
/*
* The sizeof(dns_hdr.h_len) is not counted is the packet size
* for TCP packet.
* And since this will be ignored for udp packets, let's compute it
* anyway.
*/
memset(&dns_hdr, 0, sizeof(dns_hdr));
dns_hdr.h_len = htons(n - sizeof (dns_hdr.h_len));
dns_hdr.id = htons(id);
dns_hdr.flags = htons(flags);
dns_hdr.num_q = htons(num_q);
dns_hdr.num_answ_rr = htons(num_anws_rr);
dns_hdr.num_auth_rr = htons(num_auth_rr);
dns_hdr.num_addi_rr = htons(num_addi_rr);
/*
* A dirty trick: DNS can be either TCP or UDP based, and depending on
* that, the header changes. A 'length' field is present in TCP packets,
* but not in UDP packets. As they are the first 2 bytes of the header,
* they are skipped if the packet is UDP...
*/
n = libnet_pblock_append(l, p, ((uint8_t *)&dns_hdr) + offset, h_len);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_DNSV4_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_vrrp(uint8_t version, uint8_t type, uint8_t vrouter_id,
uint8_t priority, uint8_t ip_count, uint8_t auth_type, uint8_t advert_int,
uint16_t sum, const uint8_t *payload, uint32_t payload_s, libnet_t *l,
libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_vrrp_hdr vrrp_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_VRRP_H + payload_s;
h = LIBNET_VRRP_H + payload_s;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_VRRP_H);
if (p == NULL)
{
return (-1);
}
memset(&vrrp_hdr, 0, sizeof(vrrp_hdr));
vrrp_hdr.vrrp_v = version;
vrrp_hdr.vrrp_t = type;
vrrp_hdr.vrrp_vrouter_id = vrouter_id;
vrrp_hdr.vrrp_priority = priority;
vrrp_hdr.vrrp_ip_count = ip_count;
vrrp_hdr.vrrp_auth_type = auth_type;
vrrp_hdr.vrrp_advert_int = advert_int;
vrrp_hdr.vrrp_sum = (sum ? htons(sum) : 0);
n = libnet_pblock_append(l, p, (uint8_t *)&vrrp_hdr, LIBNET_VRRP_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
if (sum == 0)
{
/*
* If checksum is zero, by default libnet will compute a checksum
* for the user. The programmer can override this by calling
* libnet_toggle_checksum(l, ptag, 1);
*/
libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
}
return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_VRRP_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}
libnet_ptag_t
libnet_build_ospfv2_lsa(uint16_t age, uint8_t opts, uint8_t type, uint32_t lsid,
uint32_t advrtr, uint32_t seqnum, uint16_t sum, uint16_t len,
const uint8_t *payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag)
{
uint32_t n, h;
libnet_pblock_t *p;
struct libnet_lsa_hdr lsa_hdr;
if (l == NULL)
{
return (-1);
}
n = LIBNET_OSPF_LSA_H + payload_s;
h = len + payload_s;
/*
* Find the existing protocol block if a ptag is specified, or create
* a new one.
*/
p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_OSPF_LSA_H);
if (p == NULL)
{
return (-1);
}
memset(&lsa_hdr, 0, sizeof(lsa_hdr));
lsa_hdr.lsa_age = htons(age);
lsa_hdr.lsa_opts = opts;
lsa_hdr.lsa_type = type;
lsa_hdr.lsa_id = htonl(lsid);
lsa_hdr.lsa_adv.s_addr = htonl(advrtr);
lsa_hdr.lsa_seq = htonl(seqnum);
lsa_hdr.lsa_sum = sum;
lsa_hdr.lsa_len = htons(h);
n = libnet_pblock_append(l, p, (uint8_t *)&lsa_hdr, LIBNET_OSPF_LSA_H);
if (n == -1)
{
goto bad;
}
/* boilerplate payload sanity check / append macro */
LIBNET_DO_PAYLOAD(l, p);
if (sum == 0)
{
/*
* If checksum is zero, by default libnet will compute a checksum
* for the user. The programmer can override this by calling
* libnet_toggle_checksum(l, ptag, 1);
*/
libnet_pblock_setflags(p, LIBNET_PBLOCK_DO_CHECKSUM);
}
return (ptag ? ptag : libnet_pblock_update(l, p, h,
LIBNET_PBLOCK_OSPF_LSA_H));
bad:
libnet_pblock_delete(l, p);
return (-1);
}