diff options
Diffstat (limited to 'ipv4.c')
| -rw-r--r-- | ipv4.c | 30 |
1 files changed, 10 insertions, 20 deletions
@@ -64,40 +64,30 @@ void icmp_packet(int fd, const char *packet, size_t len, struct iphdr *ip) { * ip - ip header */ void tcp_packet(int fd, const char *packet, size_t len, struct iphdr *ip) { - struct tcphdr tcp; + const struct tcphdr *tcp = (const struct tcphdr *) packet; const char *payload; - const char *options; - size_t payload_size, options_size; + size_t payload_size, header_size; if(len < sizeof(tcp)) { logmsg_dbg(ANDROID_LOG_ERROR,"tcp_packet/(too small)"); return; } - memcpy(&tcp, packet, sizeof(tcp)); - - if(tcp.doff < 5) { - logmsg_dbg(ANDROID_LOG_ERROR,"tcp_packet/tcp header length set to less than 5: %x",tcp.doff); + if(tcp->doff < 5) { + logmsg_dbg(ANDROID_LOG_ERROR,"tcp_packet/tcp header length set to less than 5: %x", tcp->doff); return; } - if((size_t)tcp.doff*4 > len) { - logmsg_dbg(ANDROID_LOG_ERROR,"tcp_packet/tcp header length set too large: %x",tcp.doff); + if((size_t) tcp->doff*4 > len) { + logmsg_dbg(ANDROID_LOG_ERROR,"tcp_packet/tcp header length set too large: %x", tcp->doff); return; } - if(tcp.doff > 5) { - options = packet + sizeof(tcp); - options_size = tcp.doff*4 - sizeof(tcp); - } else { - options = NULL; - options_size = 0; - } - - payload = packet + tcp.doff*4; - payload_size = len - tcp.doff*4; + header_size = tcp->doff * 4; + payload = packet + header_size; + payload_size = len - header_size; - tcp_to_tcp6(fd,ip,&tcp,payload,payload_size,options,options_size); + tcp_to_tcp6(fd, ip, tcp, header_size, payload, payload_size); } /* function: udp_packet |