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network.cpp
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/*
* network.cpp
*
* Created on: Jul 29, 2017
* Author: wangyu
*/
#include "common.h"
#include "network.h"
#include "log.h"
#include "misc.h"
int raw_recv_fd=-1;
int raw_send_fd=-1;
u32_t link_level_header_len=0;//set it to 14 if SOCK_RAW is used in socket(PF_PACKET, SOCK_RAW, htons(ETH_P_IP));
int seq_mode=3;
int max_seq_mode=4;
int random_drop=0;
int filter_port=-1;
int disable_bpf_filter=0; //for test only,most time no need to disable this
//u32_t bind_address_uint32=0;
int lower_level=0;
int lower_level_manual=0;
int ifindex=-1;
char if_name[100]="";
char dev[100]="";
unsigned short g_ip_id_counter=0;
unsigned char dest_hw_addr[sizeof(sockaddr_ll::sll_addr)]=
{0xff,0xff,0xff,0xff,0xff,0xff,0,0};
//{0x00,0x23,0x45,0x67,0x89,0xb9};
const u32_t receive_window_lower_bound=40960;
const u32_t receive_window_random_range=512;
const unsigned char wscale=0x05;
char g_packet_buf[buf_len]; //looks dirty but works well
int g_packet_buf_len=-1;
int g_packet_buf_cnt=0;
union
{
sockaddr_ll ll;
sockaddr_in ipv4;
sockaddr_in6 ipv6;
}g_sockaddr;
socklen_t g_sockaddr_len = -1;
struct sock_filter code_tcp_old[] = {
{ 0x28, 0, 0, 0x0000000c },//0
{ 0x15, 0, 10, 0x00000800 },//1
{ 0x30, 0, 0, 0x00000017 },//2
{ 0x15, 0, 8, 0x00000006 },//3
{ 0x28, 0, 0, 0x00000014 },//4
{ 0x45, 6, 0, 0x00001fff },//5
{ 0xb1, 0, 0, 0x0000000e },//6
{ 0x48, 0, 0, 0x0000000e },//7
{ 0x15, 2, 0, 0x0000ef32 },//8
{ 0x48, 0, 0, 0x00000010 },//9
{ 0x15, 0, 1, 0x0000ef32 },//10
{ 0x6, 0, 0, 0x0000ffff },//11
{ 0x6, 0, 0, 0x00000000 },//12
};
struct sock_filter code_tcp[] = {
//{ 0x5, 0, 0, 0x00000001 },//0 //jump to 2,dirty hack from tcpdump -d's output
//{ 0x5, 0, 0, 0x00000000 },//1
{ 0x30, 0, 0, 0x00000009 },//2
{ 0x15, 0, 6, 0x00000006 },//3
{ 0x28, 0, 0, 0x00000006 },//4
{ 0x45, 4, 0, 0x00001fff },//5
{ 0xb1, 0, 0, 0x00000000 },//6
{ 0x48, 0, 0, 0x00000002 },//7
{ 0x15, 0, 1, 0x0000fffe },//8 //modify this fffe to the port you listen on
{ 0x6, 0, 0, 0x0000ffff },//9
{ 0x6, 0, 0, 0x00000000 },//10
};
/*
{ 0x28, 0, 0, 0x0000000c },
{ 0x15, 0, 8, 0x00000800 },
{ 0x30, 0, 0, 0x00000017 },
{ 0x15, 0, 6, 0x00000006 },
{ 0x28, 0, 0, 0x00000014 },
{ 0x45, 4, 0, 0x00001fff },
{ 0xb1, 0, 0, 0x0000000e },
{ 0x48, 0, 0, 0x00000010 },
{ 0x15, 0, 1, 0x0000fffe },
{ 0x6, 0, 0, 0x0000ffff },
{ 0x6, 0, 0, 0x00000000 },
*/
int code_tcp_port_index=6;
//tcpdump -i ens33 ip6 and tcp and dst port 65534 -dd
struct sock_filter code_tcp6[] = {
//{ 0x28, 0, 0, 0x0000000c },//0
//{ 0x15, 0, 5, 0x000086dd },//1
{ 0x30, 0, 0, 0x00000006 },//2
{ 0x15, 0, 3, 0x00000006 },//3
{ 0x28, 0, 0, 0x0000002a },//4
{ 0x15, 0, 1, 0x0000fffe },//5
{ 0x6, 0, 0, 0x00040000 },//6
{ 0x6, 0, 0, 0x00000000 },//7
};//note: this filter doesnt support extension headers
/*
{ 0x30, 0, 0, 0x00000014 },//2
{ 0x15, 0, 3, 0x00000006 },//3
{ 0x28, 0, 0, 0x00000038 },//4
{ 0x15, 0, 1, 0x0000fffe },//5
{ 0x6, 0, 0, 0x00040000 },//6
{ 0x6, 0, 0, 0x00000000 },//7
*/
int code_tcp6_port_index=3;
struct sock_filter code_udp[] = {
//{ 0x5, 0, 0, 0x00000001 },
//{ 0x5, 0, 0, 0x00000000 },
{ 0x30, 0, 0, 0x00000009 },
{ 0x15, 0, 6, 0x00000011 },
{ 0x28, 0, 0, 0x00000006 },
{ 0x45, 4, 0, 0x00001fff },
{ 0xb1, 0, 0, 0x00000000 },
{ 0x48, 0, 0, 0x00000002 },
{ 0x15, 0, 1, 0x0000fffe }, //modify this fffe to the port you listen on
{ 0x6, 0, 0, 0x0000ffff },
{ 0x6, 0, 0, 0x00000000 },
};
int code_udp_port_index=6;
struct sock_filter code_udp6[] = {
// { 0x28, 0, 0, 0x0000000c },
// { 0x15, 0, 5, 0x000086dd },
{ 0x30, 0, 0, 0x00000006 },
{ 0x15, 0, 3, 0x00000011 },
{ 0x28, 0, 0, 0x0000002a },
{ 0x15, 0, 1, 0x0000fffe },
{ 0x6, 0, 0, 0x00040000 },
{ 0x6, 0, 0, 0x00000000 },
};
int code_udp6_port_index=3;
struct sock_filter code_icmp[] = {
//{ 0x5, 0, 0, 0x00000001 },
//{ 0x5, 0, 0, 0x00000000 },
{ 0x30, 0, 0, 0x00000009 },
{ 0x15, 0, 1, 0x00000001 },
{ 0x6, 0, 0, 0x0000ffff },
{ 0x6, 0, 0, 0x00000000 },
};
/*
tcpdump -i eth1 ip and icmp -d
(000) ldh [12]
(001) jeq #0x800 jt 2 jf 5
(002) ldb [23]
(003) jeq #0x1 jt 4 jf 5
(004) ret #65535
(005) ret #0
tcpdump -i eth1 ip and icmp -dd
{ 0x28, 0, 0, 0x0000000c },
{ 0x15, 0, 3, 0x00000800 },
{ 0x30, 0, 0, 0x00000017 },
{ 0x15, 0, 1, 0x00000001 },
{ 0x6, 0, 0, 0x0000ffff },
{ 0x6, 0, 0, 0x00000000 },
*/
/*
tcpdump -i eth1 ip and tcp and dst port 65534 -dd
{ 0x28, 0, 0, 0x0000000c },
{ 0x15, 0, 8, 0x00000800 },
{ 0x30, 0, 0, 0x00000017 },
{ 0x15, 0, 6, 0x00000006 },
{ 0x28, 0, 0, 0x00000014 },
{ 0x45, 4, 0, 0x00001fff },
{ 0xb1, 0, 0, 0x0000000e },
{ 0x48, 0, 0, 0x00000010 },
{ 0x15, 0, 1, 0x0000fffe },
{ 0x6, 0, 0, 0x0000ffff },
{ 0x6, 0, 0, 0x00000000 },
(000) ldh [12]
(001) jeq #0x800 jt 2 jf 10
(002) ldb [23]
(003) jeq #0x6 jt 4 jf 10
(004) ldh [20]
(005) jset #0x1fff jt 10 jf 6
(006) ldxb 4*([14]&0xf)
(007) ldh [x + 16]
(008) jeq #0xfffe jt 9 jf 10
(009) ret #65535
(010) ret #0
*/
packet_info_t::packet_info_t()
{
src_port=0;
dst_port=0;
if (raw_mode == mode_faketcp)
{
protocol = IPPROTO_TCP;
ack_seq = get_true_random_number();
seq = get_true_random_number();
has_ts=0;
ts_ack=0;
syn=0;
ack=1;
ack_seq_counter=0;
//mylog(log_info,"<cons ,ts_ack= %u>\n",ts_ack);
}
else if (raw_mode == mode_udp)
{
protocol = IPPROTO_UDP;
}
else if (raw_mode == mode_icmp)
{
protocol = IPPROTO_ICMP;
icmp_seq=0;
}
}
int init_raw_socket()
{
assert(raw_ip_version==AF_INET||raw_ip_version==AF_INET6);
g_ip_id_counter=get_true_random_number()%65535;
if(lower_level==0)
{
raw_send_fd = socket(raw_ip_version , SOCK_RAW , IPPROTO_RAW);// IPPROTO_TCP??
if(raw_send_fd == -1) {
mylog(log_fatal,"Failed to create raw_send_fd\n");
//perror("Failed to create raw_send_fd");
myexit(1);
}
/*ETH_P_IP
int one = 1;
const int *val = &one;
if (setsockopt (raw_send_fd, IPPROTO_IP, IP_HDRINCL, val, sizeof (one)) < 0) {
mylog(log_fatal,"Error setting IP_HDRINCL %d\n",errno);
//perror("Error setting IP_HDRINCL");
myexit(2);
}*/
}
else
{
raw_send_fd = socket(PF_PACKET , SOCK_DGRAM , htons(ETH_P_IP));// todo how to create a recv only raw socket?
if(raw_send_fd == -1) {
mylog(log_fatal,"Failed to create raw_send_fd\n");
//perror("Failed to create raw_send_fd");
myexit(1);
}
//init_ifindex(if_name);
}
int opt = 0;
assert(setsockopt(raw_send_fd, SOL_SOCKET, SO_RCVBUF, &opt, sizeof(opt))==0);// raw_send_fd is for send only, set its recv buffer to zero
if(force_socket_buf)
{
if(setsockopt(raw_send_fd, SOL_SOCKET, SO_SNDBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
{
mylog(log_fatal,"SO_SNDBUFFORCE fail socket_buf_size=%d errno=%s\n",socket_buf_size,strerror(errno));
myexit(1);
}
}
else
{
if(setsockopt(raw_send_fd, SOL_SOCKET, SO_SNDBUF, &socket_buf_size, sizeof(socket_buf_size))<0)
{
mylog(log_fatal,"SO_SNDBUF fail socket_buf_size=%d errno=%s\n",socket_buf_size,strerror(errno));
myexit(1);
}
}
//raw_fd = socket(AF_PACKET, SOCK_DGRAM, htons(ETH_P_ALL));
if(raw_ip_version==AF_INET)
raw_recv_fd= socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
else
raw_recv_fd= socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IPV6));
//ETH_P_IP doesnt read outgoing packets
// https://stackoverflow.com/questions/20264895/eth-p-ip-is-not-working-as-expected-i-can-only-receive-incoming-packets
// to capture both incoming and outgoing packets use ETH_P_ALL
if(raw_recv_fd == -1) {
mylog(log_fatal,"Failed to create raw_recv_fd\n");
//perror("");
myexit(1);
}
if(strlen(dev)!=0)
{
struct sockaddr_ll bind_address;
memset(&bind_address, 0, sizeof(bind_address));
int index=-1;
assert(init_ifindex(dev,raw_recv_fd,index)==0);
bind_address.sll_family = AF_PACKET;
if(raw_ip_version==AF_INET)
bind_address.sll_protocol = htons(ETH_P_IP);
else
bind_address.sll_protocol = htons(ETH_P_IPV6);
bind_address.sll_ifindex = index;
if(bind(raw_recv_fd, (struct sockaddr *)&bind_address, sizeof(bind_address))==-1)
{
mylog(log_fatal,"bind to dev [%s] failed\n",dev);
myexit(1);
}
}
if(force_socket_buf)
{
if(setsockopt(raw_recv_fd, SOL_SOCKET, SO_RCVBUFFORCE, &socket_buf_size, sizeof(socket_buf_size))<0)
{
mylog(log_fatal,"SO_RCVBUFFORCE fail socket_buf_size=%d errno=%s\n",socket_buf_size,strerror(errno));
myexit(1);
}
}
else
{
if(setsockopt(raw_recv_fd, SOL_SOCKET, SO_RCVBUF, &socket_buf_size, sizeof(socket_buf_size))<0)
{
mylog(log_fatal,"SO_RCVBUF fail socket_buf_size=%d errno=%s\n",socket_buf_size,strerror(errno));
myexit(1);
}
}
//IP_HDRINCL to tell the kernel that headers are included in the packet
setnonblocking(raw_send_fd); //not really necessary
setnonblocking(raw_recv_fd);
return 0;
}
void init_filter(int port)
{
sock_fprog bpf;
assert(raw_ip_version==AF_INET||raw_ip_version==AF_INET6);
if(raw_mode==mode_faketcp||raw_mode==mode_udp)
{
filter_port=port;
}
if(disable_bpf_filter) return;
//if(raw_mode==mode_icmp) return ;
//code_tcp[8].k=code_tcp[10].k=port;
if(raw_mode==mode_faketcp)
{
if(raw_ip_version==AF_INET)
{
bpf.len = sizeof(code_tcp)/sizeof(code_tcp[0]);
code_tcp[code_tcp_port_index].k=port;
bpf.filter = code_tcp;
}else
{
bpf.len = sizeof(code_tcp6)/sizeof(code_tcp6[0]);
code_tcp6[code_tcp6_port_index].k=port;
bpf.filter = code_tcp6;
}
}
else if(raw_mode==mode_udp)
{
if(raw_ip_version==AF_INET)
{
bpf.len = sizeof(code_udp)/sizeof(code_udp[0]);
code_udp[code_udp_port_index].k=port;
bpf.filter = code_udp;
}else
{
bpf.len = sizeof(code_udp6)/sizeof(code_udp6[0]);
code_udp6[code_udp6_port_index].k=port;
bpf.filter = code_udp6;
}
}
else if(raw_mode==mode_icmp)
{
bpf.len = sizeof(code_icmp)/sizeof(code_icmp[0]);
bpf.filter = code_icmp;
}
int dummy;
int ret=setsockopt(raw_recv_fd, SOL_SOCKET, SO_DETACH_FILTER, &dummy, sizeof(dummy)); //in case i forgot to remove
if (ret != 0)
{
mylog(log_debug,"error remove fiter\n");
//perror("filter");
//exit(-1);
}
ret = setsockopt(raw_recv_fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf, sizeof(bpf));
if (ret != 0)
{
mylog(log_fatal,"error set fiter\n");
//perror("filter");
myexit(-1);
}
}
void remove_filter()
{
filter_port=0;
int dummy;
int ret=setsockopt(raw_recv_fd, SOL_SOCKET, SO_DETACH_FILTER, &dummy, sizeof(dummy));
if (ret != 0)
{
mylog(log_debug,"error remove fiter\n");
//perror("filter");
//exit(-1);
}
}
int init_ifindex(const char * if_name,int fd,int &index)
{
struct ifreq ifr;
size_t if_name_len=strlen(if_name);
if (if_name_len<sizeof(ifr.ifr_name)) {
memcpy(ifr.ifr_name,if_name,if_name_len);
ifr.ifr_name[if_name_len]=0;
} else {
mylog(log_fatal,"interface name is too long\n");
myexit(-1);
}
if (ioctl(fd,SIOCGIFINDEX,&ifr)==-1) {
mylog(log_fatal,"SIOCGIFINDEX fail ,%s\n",strerror(errno));
myexit(-1);
}
index=ifr.ifr_ifindex;
mylog(log_info,"ifname:%s ifindex:%d\n",if_name,index);
return 0;
}
bool interface_has_arp(const char * interface) {
struct ifreq ifr;
// int sock = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
int sock=raw_send_fd;
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, interface);
if (ioctl(sock, SIOCGIFFLAGS, &ifr) < 0) {
//perror("SIOCGIFFLAGS");
mylog(log_fatal,"ioctl(sock, SIOCGIFFLAGS, &ifr) failed for interface %s,errno %s\n",interface,strerror(errno));
myexit(-1);
}
//close(sock);
return !(ifr.ifr_flags & IFF_NOARP);
}
struct route_info_t
{
string if_name;
u32_t dest;
u32_t mask;
u32_t gw;
u32_t flag;
};
int dest_idx=1;
int gw_idx=2;
int if_idx=0;
int mask_idx=7;
int flag_idx=3;
vector<int> find_route_entry(const vector<route_info_t> &route_info_vec,u32_t ip)
{
vector<int> res;
for(u32_t i=0;i<=32;i++)
{
u32_t mask=0xffffffff;
//mask >>=i;
//if(i==32) mask=0; //why 0xffffffff>>32 equals 0xffffffff??
mask <<=i;
if(i==32) mask=0;
log_bare(log_debug,"(mask:%x)",mask);
for(u32_t j=0;j<route_info_vec.size();j++)
{
const route_info_t & info=route_info_vec[j];
if(info.mask!=mask)
continue;
log_bare(log_debug,"<<%d,%d>>",i,j);
if((info.dest&mask)==(ip&mask))
{
log_bare(log_debug,"found!");
res.push_back(j);
}
}
if(res.size()!=0)
{
return res;
}
}
return res;
}
int find_direct_dest(const vector<route_info_t> &route_info_vec,u32_t ip,u32_t &dest_ip,string &if_name)
{
vector<int> res;
for(int i=0;i<1000;i++)
{
res=find_route_entry(route_info_vec,ip);
log_bare(log_debug,"<entry:%u>",(u32_t)res.size());
if(res.size()==0)
{
mylog(log_error,"cant find route entry\n");
return -1;
}
if(res.size()>1)
{
mylog(log_error,"found duplicated entries\n");
return -1;
}
if((route_info_vec[res[0]].flag&2)==0)
{
dest_ip=ip;
if_name=route_info_vec[res[0]].if_name;
return 0;
}
else
{
ip=route_info_vec[res[0]].gw;
}
}
mylog(log_error,"dead loop in find_direct_dest\n");
return -1;
}
struct arp_info_t
{
u32_t ip;
string hw;
string if_name;
};
int arp_ip_idx=0;
int arp_hw_idx=3;
int arp_if_idx=5;
int find_arp(const vector<arp_info_t> &arp_info_vec,u32_t ip,string if_name,string &hw)
{
int pos=-1;
int count=0;
for(u32_t i=0;i<arp_info_vec.size();i++)
{
const arp_info_t & info=arp_info_vec[i];
if(info.if_name!=if_name) continue;
if(info.ip==ip)
{
count++;
pos=i;
}
}
if(count==0)
{
//mylog(log_warn,"cant find arp entry for %s %s,using 00:00:00:00:00:00\n",my_ntoa(ip),if_name.c_str());
//hw="00:00:00:00:00:00";
mylog(log_error,"cant find arp entry for %s %s\n",my_ntoa(ip),if_name.c_str());
return -1;
}
if(count>1)
{
mylog(log_error,"find multiple arp entry for %s %s\n",my_ntoa(ip),if_name.c_str());
return -1;
}
hw=arp_info_vec[pos].hw;
return 0;
}
int find_lower_level_info(u32_t ip,u32_t &dest_ip,string &if_name,string &hw)
{
ip=htonl(ip);
if(ip==htonl(inet_addr("127.0.0.1")))
{
dest_ip=ntohl(ip);
if_name="lo";
hw="00:00:00:00:00:00";
return 0;
}
string route_file;
if(read_file("/proc/net/route",route_file)!=0) return -1;
string arp_file;
if(read_file("/proc/net/arp",arp_file)!=0) return -1;
log_bare(log_debug,"/proc/net/route:<<%s>>\n",route_file.c_str());
log_bare(log_debug,"/proc/net/arp:<<%s>>\n",route_file.c_str());
auto route_vec2=string_to_vec2(route_file.c_str());
vector<route_info_t> route_info_vec;
for(u32_t i=1;i<route_vec2.size();i++)
{
log_bare(log_debug,"<size:%u>",(u32_t)route_vec2[i].size());
if(route_vec2[i].size()!=11)
{
mylog(log_error,"route coloum %d !=11 \n",int(route_vec2[i].size()));
return -1;
}
route_info_t tmp;
tmp.if_name=route_vec2[i][if_idx];
if(hex_to_u32_with_endian(route_vec2[i][dest_idx],tmp.dest)!=0) return -1;
if(hex_to_u32_with_endian(route_vec2[i][gw_idx],tmp.gw)!=0) return -1;
if(hex_to_u32_with_endian(route_vec2[i][mask_idx],tmp.mask)!=0) return -1;
if(hex_to_u32(route_vec2[i][flag_idx],tmp.flag)!=0)return -1;
route_info_vec.push_back(tmp);
for(u32_t j=0;j<route_vec2[i].size();j++)
{
log_bare(log_debug,"<%s>",route_vec2[i][j].c_str());
}
log_bare(log_debug,"%s dest:%x mask:%x gw:%x flag:%x",tmp.if_name.c_str(),tmp.dest,tmp.mask,tmp.gw,tmp.flag);
log_bare(log_debug,"\n");
}
if(find_direct_dest(route_info_vec,ip,dest_ip,if_name)!=0)
{
mylog(log_error,"find_direct_dest failed for ip %s\n",my_ntoa(ntohl(ip)));
return -1;
}
log_bare(log_debug,"========\n");
auto arp_vec2=string_to_vec2(arp_file.c_str());
vector<arp_info_t> arp_info_vec;
for(u32_t i=1;i<arp_vec2.size();i++)
{
log_bare(log_debug,"<<arp_vec2[i].size(): %d>>",(int)arp_vec2[i].size());
for(u32_t j=0;j<arp_vec2[i].size();j++)
{
log_bare(log_debug,"<%s>",arp_vec2[i][j].c_str());
}
if(arp_vec2[i].size()!=6)
{
mylog(log_error,"arp coloum %d !=11 \n",int(arp_vec2[i].size()));
return -1;
}
arp_info_t tmp;
tmp.if_name=arp_vec2[i][arp_if_idx];
tmp.hw=arp_vec2[i][arp_hw_idx];
tmp.ip=htonl(inet_addr(arp_vec2[i][arp_ip_idx].c_str()));
arp_info_vec.push_back(tmp);
log_bare(log_debug,"\n");
}
if(!interface_has_arp(if_name.c_str()))
{
mylog(log_info,"%s is a noarp interface,using 00:00:00:00:00:00\n",if_name.c_str());
hw="00:00:00:00:00:00";
}
else if(find_arp(arp_info_vec,dest_ip,if_name,hw)!=0)
{
mylog(log_error,"find_arp failed for dest_ip %s ,if_name %s\n",my_ntoa(ntohl(ip)),if_name.c_str());
return -1;
}
//printf("%s\n",hw.c_str());
dest_ip=ntohl(dest_ip);
return 0;
}
int send_raw_packet(raw_info_t &raw_info,const char * packet,int len)
{
const packet_info_t &send_info=raw_info.send_info;
const packet_info_t &recv_info=raw_info.recv_info;
int ret;
if(lower_level==0)
{
if(raw_ip_version==AF_INET)
{
struct sockaddr_in sin={0};
sin.sin_family = raw_ip_version;
//sin.sin_port = htons(info.dst_port); //dont need this
sin.sin_addr.s_addr = send_info.new_dst_ip.v4;
ret = sendto(raw_send_fd, packet, len , 0, (struct sockaddr *) &sin, sizeof (sin));
}
else if(raw_ip_version==AF_INET6)
{
struct sockaddr_in6 sin={0};
sin.sin6_family = raw_ip_version;
//sin.sin_port = htons(info.dst_port); //dont need this
sin.sin6_addr = send_info.new_dst_ip.v6;
ret = sendto(raw_send_fd, packet, len , 0, (struct sockaddr *) &sin, sizeof (sin));
}else
{
assert(0==1);
}
}
else
{
struct sockaddr_ll addr={0}; //={0} not necessary
memcpy(&addr,&send_info.addr_ll,sizeof(addr));
ret = sendto(raw_send_fd, packet, len , 0, (struct sockaddr *) &addr, sizeof (addr));
}
if(ret==-1)
{
mylog(log_trace,"sendto failed\n");
//perror("why?");
return -1;
}
else
{
//mylog(log_info,"sendto succ\n");
}
return 0;
}
int send_raw_ip(raw_info_t &raw_info,const char * payload,int payloadlen)
{
const packet_info_t &send_info=raw_info.send_info;
const packet_info_t &recv_info=raw_info.recv_info;
char send_raw_ip_buf[buf_len];
if(raw_info.disabled)
{
mylog(log_debug,"[%s,%d]connection disabled, no packet will be sent\n",recv_info.new_src_ip.get_str1(),recv_info.src_port);
assert(max_rst_allowed>=0);
return 0;
}
uint16_t ip_tot_len;
if(raw_ip_version==AF_INET)
{
struct iphdr *iph = (struct iphdr *) send_raw_ip_buf;
memset(iph,0,sizeof(iphdr));
iph->ihl = sizeof(iphdr)/4; //we dont use ip options,so the length is just sizeof(iphdr)
iph->version = 4;
iph->tos = 0;
if(lower_level)
{
//iph->id=0;
iph->id = htons (g_ip_id_counter++); //Id of this packet
}
else//no need to else?
{
iph->id = htons (g_ip_id_counter++); //Id of this packet
//iph->id = 0; //Id of this packet ,kernel will auto fill this if id is zero ,or really?????// todo //seems like there is a problem
}
iph->frag_off = htons(0x4000); //DF set,others are zero
// iph->frag_off = htons(0x0000); //DF set,others are zero
iph->ttl = (unsigned char)ttl_value;
iph->protocol = send_info.protocol;
iph->check = 0; //Set to 0 before calculating checksum
iph->saddr = send_info.new_src_ip.v4; //Spoof the source ip address
iph->daddr = send_info.new_dst_ip.v4;
ip_tot_len=sizeof (struct iphdr)+payloadlen;
if(lower_level)iph->tot_len = htons(ip_tot_len); //this is not necessary ,kernel will always auto fill this //http://man7.org/linux/man-pages/man7/raw.7.html
else
iph->tot_len = 0;
memcpy(send_raw_ip_buf+sizeof(iphdr) , payload, payloadlen);
if(lower_level) iph->check =
csum ((unsigned short *) send_raw_ip_buf, iph->ihl*4); //this is not necessary ,kernel will always auto fill this
else
iph->check=0;
}
else
{
assert(raw_ip_version==AF_INET6);
struct my_ip6hdr *ip6h = (struct my_ip6hdr *) send_raw_ip_buf;
memset(ip6h,0,sizeof(my_ip6hdr));
ip6h->version=6;
ip6h->payload_len=htons(payloadlen);
ip6h->next_header=send_info.protocol;
ip6h->hop_limit=(unsigned char)ttl_value;
ip6h->src=send_info.new_src_ip.v6;
ip6h->dst=send_info.new_dst_ip.v6;
ip_tot_len=sizeof (struct my_ip6hdr)+payloadlen;
memcpy(send_raw_ip_buf+sizeof(my_ip6hdr) , payload, payloadlen);
}
return send_raw_packet(raw_info,send_raw_ip_buf,ip_tot_len);
}
int pre_recv_raw_packet()
{
assert(g_packet_buf_cnt==0);
g_sockaddr_len=sizeof(g_sockaddr.ll);
g_packet_buf_len = recvfrom(raw_recv_fd, g_packet_buf, max_data_len+1, 0 ,(sockaddr*)&g_sockaddr , &g_sockaddr_len);
//assert(g_sockaddr_len==sizeof(g_sockaddr.ll)); //g_sockaddr_len=18, sizeof(g_sockaddr.ll)=20, why its not equal? maybe its bc sll_halen is 6?
//assert(g_addr_ll_size==sizeof(g_addr_ll));
if(g_packet_buf_len==max_data_len+1)
{
mylog(log_warn,"huge packet, data_len > %d,dropped\n",max_data_len);
return -1;
}
if(g_packet_buf_len<0)
{
mylog(log_trace,"recv_len %d\n",g_packet_buf_len);
return -1;
}
g_packet_buf_cnt++;
return 0;
}
int discard_raw_packet()
{
assert(g_packet_buf_cnt==1);
g_packet_buf_cnt--;
return 0;
}
int recv_raw_packet(char * &packet,int &len,int peek)
{
assert(g_packet_buf_cnt==1);
if(!peek)
g_packet_buf_cnt--;
if(g_packet_buf_len<int(link_level_header_len))
{
mylog(log_trace,"packet len %d shorter than link_level_header_len %d\n",g_packet_buf_len,int(link_level_header_len));
return -1;
}
if(link_level_header_len ==14)
{
unsigned char a=g_packet_buf[12];
unsigned char b=g_packet_buf[13];
if(! ((a==0x08&&b==0x00) ||(a==0x86&&b==0xdd)) )
{
mylog(log_trace,"not an ipv4 or ipv6 packet!\n");
return -1;
}
}
packet=g_packet_buf+int(link_level_header_len);
len=g_packet_buf_len-int(link_level_header_len);
return 0;
}
int recv_raw_ip(raw_info_t &raw_info,char * &payload,int &payloadlen)
{
char *raw_packet_buf;
//static char recv_raw_ip_buf[buf_len];
int raw_packet_len;
if(recv_raw_packet(raw_packet_buf,raw_packet_len,raw_info.peek)!=0) return -1;
//const packet_info_t &send_info=raw_info.send_info;
packet_info_t &recv_info=raw_info.recv_info;
iphdr * iph;
my_ip6hdr * ip6h;
int flag=0;
//int recv_len = recvfrom(raw_recv_fd, recv_raw_ip_buf, max_data_len+1, flag ,(sockaddr*)&saddr , &saddr_size);
char *ip_begin=raw_packet_buf; //14 is eth net header
if(raw_packet_len<1)
{
mylog(log_trace,"raw_packet_len <1, dropped\n");
return -1;
}
iph = (struct iphdr *) (ip_begin);
ip6h= (struct my_ip6hdr *) (ip_begin);
if(raw_ip_version==AF_INET)
{
if(iph->version!=4)
{
mylog(log_trace,"expect ipv4 packet, but got something else: %02x\n",iph->version);
return -1;
}
if(raw_packet_len<(int)sizeof(iphdr))
{
mylog(log_trace,"raw_packet_len<sizeof(iphdr)\n");
return -1;
}
}
else
{
assert(raw_ip_version==AF_INET6);
if(ip6h->version!=6)
{
mylog(log_trace,"expect ipv6 packet, but got something else: %02x\n",ip6h->version);
return -1;
}
if(raw_packet_len<(int)sizeof(my_ip6hdr))
{
mylog(log_trace,"raw_packet_len<sizeof(ip6_hdr)\n");
return -1;
}
}
if(lower_level)
{
memcpy(&recv_info.addr_ll,&g_sockaddr.ll,sizeof(recv_info.addr_ll));
}
if(bind_addr_used && !recv_info.new_dst_ip.equal(bind_addr))
{
mylog(log_trace,"bind adress doenst match, dropped\n");
//printf(" bind adress doenst match, dropped\n");
return -1;
}
unsigned short iphdrlen;
int ip_len;
if(raw_ip_version==AF_INET)
{
recv_info.new_src_ip.v4=iph->saddr;
recv_info.new_dst_ip.v4=iph->daddr;
recv_info.protocol=iph->protocol;
iphdrlen =iph->ihl*4;
ip_len=ntohs(iph->tot_len);
}
else
{
//todo flow id
recv_info.new_src_ip.v6=ip6h->src;
recv_info.new_dst_ip.v6=ip6h->dst;
iphdrlen=40;
recv_info.protocol=ip6h->next_header; //todo handle extension headers;
ip_len=ntohs(ip6h->payload_len)+iphdrlen;
}
//if (!(iph->ihl > 0 && iph->ihl <=60)) {
// mylog(log_trace,"iph ihl error\n");
// return -1;
// }
if(raw_packet_len <ip_len)
{
mylog(log_debug,"incomplete packet\n");
return -1;
}
if(raw_ip_version==AF_INET)
{
if(raw_info.peek==0)// avoid cal it twice
{
u32_t ip_chk=csum ((unsigned short *) ip_begin, iphdrlen);
if(ip_chk!=0)
{
mylog(log_debug,"ip header error %x\n",ip_chk);
return -1;
}
}
}
else
{
}
payload=ip_begin+iphdrlen;
payloadlen=ip_len-iphdrlen;
if(payloadlen<0)
{
mylog(log_warn,"error payload len\n");
return -1;
}
return 0;
}
int peek_raw(raw_info_t &raw_info)
{
//static char peek_raw_buf[buf_len];
//assert(g_packet_buf_cnt==1);
//g_packet_buf_cnt--;
//char * peek_raw_buf=g_packet_buf;
//int recv_len=g_packet_buf_len;
//char *ip_begin=peek_raw_buf+link_level_header_len;
//struct sockaddr saddr={0};
//socklen_t saddr_size=sizeof(saddr);