diff options
Diffstat (limited to 'udp.c')
| -rw-r--r-- | udp.c | 26 |
1 files changed, 3 insertions, 23 deletions
@@ -65,16 +65,15 @@ unsigned short udp_sum_calc(unsigned char *src_addr,unsigned char *dst_addr, uns sum += word16; } - len = len; sum += prot_udp + len; while (sum>>16) - sum = (sum & 0xFFFF)+(sum >> 16); + sum = (sum & 0xFFFF) + (sum >> 16); sum = ~sum; - if (sum == 0) - sum = 0xffff; + if ((unsigned short)sum == 0) + sum = 0xFFFF; return (unsigned short) sum; } @@ -114,11 +113,7 @@ int send_custom_udp(const int socket, const int ifindex, const unsigned char *so /* Init SendTo struct */ socket_address.sll_family = PF_PACKET; -#if BYTE_ORDER == LITTLE_ENDIAN socket_address.sll_protocol = htons(ETH_P_IP); -#else - socket_address.sll_protocol = ETH_P_IP; -#endif socket_address.sll_ifindex = ifindex; socket_address.sll_hatype = ARPHRD_ETHER; socket_address.sll_pkttype = PACKET_OTHERHOST; @@ -132,15 +127,9 @@ int send_custom_udp(const int socket, const int ifindex, const unsigned char *so ip->version = 4; ip->ihl = 5; ip->tos = 0x10; -#if BYTE_ORDER == LITTLE_ENDIAN ip->tot_len = htons(datalen + 8 + 20); ip->id = htons(id++); ip->frag_off = htons(0x4000); -#else - ip->tot_len = datalen + 8 + 20; - ip->id = id++; - ip->frag_off = 0x4000; -#endif ip->ttl = 64; ip->protocol = 17; /* UDP */ ip->check = 0x0000; @@ -151,26 +140,17 @@ int send_custom_udp(const int socket, const int ifindex, const unsigned char *so ip->check = in_cksum((unsigned short *)ip, sizeof(struct iphdr)); /* Init UDP Header */ -#if BYTE_ORDER == LITTLE_ENDIAN udp->source = htons(sourceport); udp->dest = htons(destport); udp->len = htons(sizeof(struct udphdr) + datalen); udp->check = 0; -#else - udp->source = sourceport; - udp->dest = destport; - udp->check = 0; - udp->len = sizeof(struct udphdr) + datalen; -#endif /* Insert actual data */ memcpy(rest, data, datalen); /* Add UDP checksum */ udp->check = udp_sum_calc((unsigned char *)&(ip->saddr), (unsigned char *)&(ip->daddr), (unsigned char *)udp, sizeof(struct udphdr) + datalen); -#if BYTE_ORDER == LITTLE_ENDIAN udp->check = htons(udp->check); -#endif /* Send the packet */ send_result = sendto(socket, buffer, datalen+8+14+20, 0, (struct sockaddr*)&socket_address, sizeof(socket_address)); |