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154 lines
3.1 KiB
C
154 lines
3.1 KiB
C
/* NHRP daemon Linux specific glue
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* Copyright (c) 2014-2015 Timo Teräs
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*
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* This file is free software: you may copy, redistribute and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <asm/types.h>
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#include <arpa/inet.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/ip.h>
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#include <linux/if_arp.h>
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#include <linux/if_tunnel.h>
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#include "nhrp_protocol.h"
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#include "os.h"
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#include "netlink.h"
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static int nhrp_socket_fd = -1;
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int os_socket(void)
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{
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if (nhrp_socket_fd < 0)
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nhrp_socket_fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_NHRP));
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return nhrp_socket_fd;
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}
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int os_sendmsg(const uint8_t *buf, size_t len, int ifindex, const uint8_t *addr, size_t addrlen)
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{
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struct sockaddr_ll lladdr;
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struct iovec iov = {
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.iov_base = (void*) buf,
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.iov_len = len,
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};
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struct msghdr msg = {
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.msg_name = &lladdr,
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.msg_namelen = sizeof(lladdr),
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.msg_iov = &iov,
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.msg_iovlen = 1,
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};
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int status;
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if (addrlen > sizeof(lladdr.sll_addr))
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return -1;
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memset(&lladdr, 0, sizeof(lladdr));
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lladdr.sll_family = AF_PACKET;
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lladdr.sll_protocol = htons(ETH_P_NHRP);
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lladdr.sll_ifindex = ifindex;
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lladdr.sll_halen = addrlen;
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memcpy(lladdr.sll_addr, addr, addrlen);
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status = sendmsg(nhrp_socket_fd, &msg, 0);
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if (status < 0)
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return -1;
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return 0;
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}
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int os_recvmsg(uint8_t *buf, size_t *len, int *ifindex, uint8_t *addr, size_t *addrlen)
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{
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struct sockaddr_ll lladdr;
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struct iovec iov = {
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.iov_base = buf,
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.iov_len = *len,
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};
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struct msghdr msg = {
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.msg_name = &lladdr,
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.msg_namelen = sizeof(lladdr),
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.msg_iov = &iov,
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.msg_iovlen = 1,
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};
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int r;
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r = recvmsg(nhrp_socket_fd, &msg, MSG_DONTWAIT);
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if (r < 0)
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return r;
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*len = r;
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*ifindex = lladdr.sll_ifindex;
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if (*addrlen <= (size_t) lladdr.sll_addr) {
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if (memcmp(lladdr.sll_addr, "\x00\x00\x00\x00", 4) != 0) {
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memcpy(addr, lladdr.sll_addr, lladdr.sll_halen);
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*addrlen = lladdr.sll_halen;
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} else {
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*addrlen = 0;
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}
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}
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return 0;
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}
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static int linux_configure_arp(const char *iface, int on)
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{
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struct ifreq ifr;
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strncpy(ifr.ifr_name, iface, IFNAMSIZ - 1);
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if (ioctl(nhrp_socket_fd, SIOCGIFFLAGS, &ifr))
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return -1;
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if (on)
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ifr.ifr_flags &= ~IFF_NOARP;
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else
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ifr.ifr_flags |= IFF_NOARP;
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if (ioctl(nhrp_socket_fd, SIOCSIFFLAGS, &ifr))
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return -1;
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return 0;
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}
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static int linux_icmp_redirect_off(const char *iface)
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{
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char fname[256];
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int fd, ret = -1;
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sprintf(fname, "/proc/sys/net/ipv4/conf/%s/send_redirects", iface);
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fd = open(fname, O_WRONLY);
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if (fd < 0)
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return -1;
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if (write(fd, "0\n", 2) == 2)
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ret = 0;
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close(fd);
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return ret;
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}
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int os_configure_dmvpn(unsigned int ifindex, const char *ifname, int af)
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{
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int ret = 0;
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switch (af) {
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case AF_INET:
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ret |= linux_icmp_redirect_off("all");
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ret |= linux_icmp_redirect_off(ifname);
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break;
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}
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ret |= linux_configure_arp(ifname, 1);
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ret |= netlink_configure_arp(ifindex, af);
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return ret;
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}
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