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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.
13 #include <linux/if_packet.h>
15 #include "nhrp_protocol.h"
19 size_t strlcpy(char *__restrict dest
,
20 const char *__restrict src
, size_t destsize
);
23 static int nhrp_socket_fd
= -1;
27 if (nhrp_socket_fd
< 0)
29 socket(PF_PACKET
, SOCK_DGRAM
, htons(ETH_P_NHRP
));
30 return nhrp_socket_fd
;
33 int os_sendmsg(const uint8_t *buf
, size_t len
, int ifindex
, const uint8_t *addr
,
34 size_t addrlen
, uint16_t protocol
)
36 struct sockaddr_ll lladdr
;
38 .iov_base
= (void *)buf
, .iov_len
= len
,
42 .msg_namelen
= sizeof(lladdr
),
48 if (addrlen
> sizeof(lladdr
.sll_addr
))
51 memset(&lladdr
, 0, sizeof(lladdr
));
52 lladdr
.sll_family
= AF_PACKET
;
53 lladdr
.sll_protocol
= htons(protocol
);
54 lladdr
.sll_ifindex
= ifindex
;
55 lladdr
.sll_halen
= addrlen
;
56 memcpy(lladdr
.sll_addr
, addr
, addrlen
);
62 status
= sendmsg(fd
, &msg
, 0);
69 int os_recvmsg(uint8_t *buf
, size_t *len
, int *ifindex
, uint8_t *addr
,
72 struct sockaddr_ll lladdr
;
74 .iov_base
= buf
, .iov_len
= *len
,
78 .msg_namelen
= sizeof(lladdr
),
84 r
= recvmsg(nhrp_socket_fd
, &msg
, MSG_DONTWAIT
);
89 *ifindex
= lladdr
.sll_ifindex
;
91 if (*addrlen
<= (size_t)lladdr
.sll_addr
) {
92 if (memcmp(lladdr
.sll_addr
, "\x00\x00\x00\x00", 4) != 0) {
93 memcpy(addr
, lladdr
.sll_addr
, lladdr
.sll_halen
);
94 *addrlen
= lladdr
.sll_halen
;
103 static int linux_configure_arp(const char *iface
, int on
)
107 strlcpy(ifr
.ifr_name
, iface
, IFNAMSIZ
);
108 if (ioctl(nhrp_socket_fd
, SIOCGIFFLAGS
, &ifr
))
112 ifr
.ifr_flags
&= ~IFF_NOARP
;
114 ifr
.ifr_flags
|= IFF_NOARP
;
116 if (ioctl(nhrp_socket_fd
, SIOCSIFFLAGS
, &ifr
))
122 static int linux_icmp_redirect_off(const char *iface
)
124 char fname
[PATH_MAX
];
127 snprintf(fname
, sizeof(fname
),
128 "/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
);
149 ret
|= linux_configure_arp(ifname
, 1);