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1 /* NHRP daemon Linux specific glue
2 * Copyright (c) 2014-2015 Timo Teräs
4 * This file is free software: you may copy, redistribute and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation, either version 2 of the License, or
7 * (at your option) any later version.
14 #include <sys/ioctl.h>
15 #include <sys/socket.h>
16 #include <sys/types.h>
17 #include <asm/types.h>
18 #include <arpa/inet.h>
19 #include <linux/netlink.h>
20 #include <linux/rtnetlink.h>
22 #include <linux/if_arp.h>
23 #include <linux/if_tunnel.h>
25 #include "nhrp_protocol.h"
29 static int nhrp_socket_fd
= -1;
33 if (nhrp_socket_fd
< 0)
34 nhrp_socket_fd
= socket(PF_PACKET
, SOCK_DGRAM
, htons(ETH_P_NHRP
));
35 return nhrp_socket_fd
;
38 int os_sendmsg(const uint8_t *buf
, size_t len
, int ifindex
, const uint8_t *addr
, size_t addrlen
)
40 struct sockaddr_ll lladdr
;
42 .iov_base
= (void*) buf
,
47 .msg_namelen
= sizeof(lladdr
),
53 if (addrlen
> sizeof(lladdr
.sll_addr
))
56 memset(&lladdr
, 0, sizeof(lladdr
));
57 lladdr
.sll_family
= AF_PACKET
;
58 lladdr
.sll_protocol
= htons(ETH_P_NHRP
);
59 lladdr
.sll_ifindex
= ifindex
;
60 lladdr
.sll_halen
= addrlen
;
61 memcpy(lladdr
.sll_addr
, addr
, addrlen
);
63 status
= sendmsg(nhrp_socket_fd
, &msg
, 0);
70 int os_recvmsg(uint8_t *buf
, size_t *len
, int *ifindex
, uint8_t *addr
, size_t *addrlen
)
72 struct sockaddr_ll lladdr
;
79 .msg_namelen
= sizeof(lladdr
),
85 r
= recvmsg(nhrp_socket_fd
, &msg
, MSG_DONTWAIT
);
90 *ifindex
= lladdr
.sll_ifindex
;
92 if (*addrlen
<= (size_t) lladdr
.sll_addr
) {
93 if (memcmp(lladdr
.sll_addr
, "\x00\x00\x00\x00", 4) != 0) {
94 memcpy(addr
, lladdr
.sll_addr
, lladdr
.sll_halen
);
95 *addrlen
= lladdr
.sll_halen
;
104 static int linux_configure_arp(const char *iface
, int on
)
108 strncpy(ifr
.ifr_name
, iface
, IFNAMSIZ
);
109 if (ioctl(nhrp_socket_fd
, SIOCGIFFLAGS
, &ifr
))
113 ifr
.ifr_flags
&= ~IFF_NOARP
;
115 ifr
.ifr_flags
|= IFF_NOARP
;
117 if (ioctl(nhrp_socket_fd
, SIOCSIFFLAGS
, &ifr
))
123 static int linux_icmp_redirect_off(const char *iface
)
128 sprintf(fname
, "/proc/sys/net/ipv4/conf/%s/send_redirects", iface
);
129 fd
= open(fname
, O_WRONLY
);
132 if (write(fd
, "0\n", 2) == 2)
139 int os_configure_dmvpn(unsigned int ifindex
, const char *ifname
, int af
)
145 ret
= linux_icmp_redirect_off("all");
146 ret
|= linux_icmp_redirect_off(ifname
);
147 ret
|= netlink_configure_arp(ifindex
, AF_INET
);
148 ret
|= linux_configure_arp(ifname
, 1);