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1 | /* NHRP daemon Linux specific glue |
2 | * Copyright (c) 2014-2015 Timo Teräs | |
3 | * | |
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. | |
8 | */ | |
9 | ||
10 | #include <fcntl.h> | |
11 | #include <stdio.h> | |
12 | #include <unistd.h> | |
13 | #include <string.h> | |
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> | |
21 | #include <linux/ip.h> | |
22 | #include <linux/if_arp.h> | |
23 | #include <linux/if_tunnel.h> | |
24 | ||
25 | #include "nhrp_protocol.h" | |
26 | #include "os.h" | |
27 | #include "netlink.h" | |
28 | ||
29 | static int nhrp_socket_fd = -1; | |
30 | ||
31 | int os_socket(void) | |
32 | { | |
33 | if (nhrp_socket_fd < 0) | |
34 | nhrp_socket_fd = socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_NHRP)); | |
35 | return nhrp_socket_fd; | |
36 | } | |
37 | ||
38 | int os_sendmsg(const uint8_t *buf, size_t len, int ifindex, const uint8_t *addr, size_t addrlen) | |
39 | { | |
40 | struct sockaddr_ll lladdr; | |
41 | struct iovec iov = { | |
42 | .iov_base = (void*) buf, | |
43 | .iov_len = len, | |
44 | }; | |
45 | struct msghdr msg = { | |
46 | .msg_name = &lladdr, | |
47 | .msg_namelen = sizeof(lladdr), | |
48 | .msg_iov = &iov, | |
49 | .msg_iovlen = 1, | |
50 | }; | |
51 | int status; | |
52 | ||
53 | if (addrlen > sizeof(lladdr.sll_addr)) | |
54 | return -1; | |
55 | ||
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); | |
62 | ||
63 | status = sendmsg(nhrp_socket_fd, &msg, 0); | |
64 | if (status < 0) | |
65 | return -1; | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
70 | int os_recvmsg(uint8_t *buf, size_t *len, int *ifindex, uint8_t *addr, size_t *addrlen) | |
71 | { | |
72 | struct sockaddr_ll lladdr; | |
73 | struct iovec iov = { | |
74 | .iov_base = buf, | |
75 | .iov_len = *len, | |
76 | }; | |
77 | struct msghdr msg = { | |
78 | .msg_name = &lladdr, | |
79 | .msg_namelen = sizeof(lladdr), | |
80 | .msg_iov = &iov, | |
81 | .msg_iovlen = 1, | |
82 | }; | |
83 | int r; | |
84 | ||
85 | r = recvmsg(nhrp_socket_fd, &msg, MSG_DONTWAIT); | |
86 | if (r < 0) | |
87 | return r; | |
88 | ||
89 | *len = r; | |
90 | *ifindex = lladdr.sll_ifindex; | |
91 | ||
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; | |
96 | } else { | |
97 | *addrlen = 0; | |
98 | } | |
99 | } | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static int linux_configure_arp(const char *iface, int on) | |
105 | { | |
106 | struct ifreq ifr; | |
107 | ||
108 | strncpy(ifr.ifr_name, iface, IFNAMSIZ); | |
109 | if (ioctl(nhrp_socket_fd, SIOCGIFFLAGS, &ifr)) | |
110 | return -1; | |
111 | ||
112 | if (on) | |
113 | ifr.ifr_flags &= ~IFF_NOARP; | |
114 | else | |
115 | ifr.ifr_flags |= IFF_NOARP; | |
116 | ||
117 | if (ioctl(nhrp_socket_fd, SIOCSIFFLAGS, &ifr)) | |
118 | return -1; | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static int linux_icmp_redirect_off(const char *iface) | |
124 | { | |
125 | char fname[256]; | |
126 | int fd, ret = -1; | |
127 | ||
128 | sprintf(fname, "/proc/sys/net/ipv4/conf/%s/send_redirects", iface); | |
129 | fd = open(fname, O_WRONLY); | |
130 | if (fd < 0) | |
131 | return -1; | |
132 | if (write(fd, "0\n", 2) == 2) | |
133 | ret = 0; | |
134 | close(fd); | |
135 | ||
136 | return ret; | |
137 | } | |
138 | ||
139 | int os_configure_dmvpn(unsigned int ifindex, const char *ifname, int af) | |
140 | { | |
141 | int ret = -1; | |
142 | ||
143 | switch (af) { | |
144 | case AF_INET: | |
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); | |
149 | break; | |
150 | } | |
151 | ||
152 | return ret; | |
153 | } |