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2fb975da TT |
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 | ||
b45ac5f5 DL |
10 | #ifdef HAVE_CONFIG_H |
11 | #include "config.h" | |
12 | #endif | |
13 | ||
2fb975da TT |
14 | #include <fcntl.h> |
15 | #include <stdio.h> | |
16 | #include <unistd.h> | |
17 | #include <string.h> | |
18 | #include <sys/ioctl.h> | |
19 | #include <sys/socket.h> | |
20 | #include <sys/types.h> | |
21 | #include <asm/types.h> | |
22 | #include <arpa/inet.h> | |
23 | #include <linux/netlink.h> | |
24 | #include <linux/rtnetlink.h> | |
25 | #include <linux/ip.h> | |
26 | #include <linux/if_arp.h> | |
27 | #include <linux/if_tunnel.h> | |
28 | ||
29 | #include "nhrp_protocol.h" | |
30 | #include "os.h" | |
31 | #include "netlink.h" | |
32 | ||
33 | static int nhrp_socket_fd = -1; | |
34 | ||
35 | int os_socket(void) | |
36 | { | |
37 | if (nhrp_socket_fd < 0) | |
996c9314 LB |
38 | nhrp_socket_fd = |
39 | socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_NHRP)); | |
2fb975da TT |
40 | return nhrp_socket_fd; |
41 | } | |
42 | ||
996c9314 LB |
43 | int os_sendmsg(const uint8_t *buf, size_t len, int ifindex, const uint8_t *addr, |
44 | size_t addrlen) | |
2fb975da TT |
45 | { |
46 | struct sockaddr_ll lladdr; | |
47 | struct iovec iov = { | |
996c9314 | 48 | .iov_base = (void *)buf, .iov_len = len, |
2fb975da TT |
49 | }; |
50 | struct msghdr msg = { | |
51 | .msg_name = &lladdr, | |
52 | .msg_namelen = sizeof(lladdr), | |
53 | .msg_iov = &iov, | |
54 | .msg_iovlen = 1, | |
55 | }; | |
56 | int status; | |
57 | ||
58 | if (addrlen > sizeof(lladdr.sll_addr)) | |
59 | return -1; | |
60 | ||
61 | memset(&lladdr, 0, sizeof(lladdr)); | |
62 | lladdr.sll_family = AF_PACKET; | |
63 | lladdr.sll_protocol = htons(ETH_P_NHRP); | |
64 | lladdr.sll_ifindex = ifindex; | |
65 | lladdr.sll_halen = addrlen; | |
66 | memcpy(lladdr.sll_addr, addr, addrlen); | |
67 | ||
68 | status = sendmsg(nhrp_socket_fd, &msg, 0); | |
69 | if (status < 0) | |
70 | return -1; | |
71 | ||
72 | return 0; | |
73 | } | |
74 | ||
996c9314 LB |
75 | int os_recvmsg(uint8_t *buf, size_t *len, int *ifindex, uint8_t *addr, |
76 | size_t *addrlen) | |
2fb975da TT |
77 | { |
78 | struct sockaddr_ll lladdr; | |
79 | struct iovec iov = { | |
996c9314 | 80 | .iov_base = buf, .iov_len = *len, |
2fb975da TT |
81 | }; |
82 | struct msghdr msg = { | |
83 | .msg_name = &lladdr, | |
84 | .msg_namelen = sizeof(lladdr), | |
85 | .msg_iov = &iov, | |
86 | .msg_iovlen = 1, | |
87 | }; | |
88 | int r; | |
89 | ||
90 | r = recvmsg(nhrp_socket_fd, &msg, MSG_DONTWAIT); | |
91 | if (r < 0) | |
92 | return r; | |
93 | ||
94 | *len = r; | |
95 | *ifindex = lladdr.sll_ifindex; | |
96 | ||
996c9314 | 97 | if (*addrlen <= (size_t)lladdr.sll_addr) { |
2fb975da TT |
98 | if (memcmp(lladdr.sll_addr, "\x00\x00\x00\x00", 4) != 0) { |
99 | memcpy(addr, lladdr.sll_addr, lladdr.sll_halen); | |
100 | *addrlen = lladdr.sll_halen; | |
101 | } else { | |
102 | *addrlen = 0; | |
103 | } | |
104 | } | |
105 | ||
106 | return 0; | |
107 | } | |
108 | ||
109 | static int linux_configure_arp(const char *iface, int on) | |
110 | { | |
111 | struct ifreq ifr; | |
112 | ||
b19abe11 | 113 | strncpy(ifr.ifr_name, iface, IFNAMSIZ - 1); |
2fb975da TT |
114 | if (ioctl(nhrp_socket_fd, SIOCGIFFLAGS, &ifr)) |
115 | return -1; | |
116 | ||
117 | if (on) | |
118 | ifr.ifr_flags &= ~IFF_NOARP; | |
119 | else | |
120 | ifr.ifr_flags |= IFF_NOARP; | |
121 | ||
122 | if (ioctl(nhrp_socket_fd, SIOCSIFFLAGS, &ifr)) | |
123 | return -1; | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
128 | static int linux_icmp_redirect_off(const char *iface) | |
129 | { | |
130 | char fname[256]; | |
131 | int fd, ret = -1; | |
132 | ||
133 | sprintf(fname, "/proc/sys/net/ipv4/conf/%s/send_redirects", iface); | |
134 | fd = open(fname, O_WRONLY); | |
135 | if (fd < 0) | |
136 | return -1; | |
137 | if (write(fd, "0\n", 2) == 2) | |
138 | ret = 0; | |
139 | close(fd); | |
140 | ||
141 | return ret; | |
142 | } | |
143 | ||
144 | int os_configure_dmvpn(unsigned int ifindex, const char *ifname, int af) | |
145 | { | |
896868a6 | 146 | int ret = 0; |
2fb975da TT |
147 | |
148 | switch (af) { | |
149 | case AF_INET: | |
896868a6 | 150 | ret |= linux_icmp_redirect_off("all"); |
2fb975da | 151 | ret |= linux_icmp_redirect_off(ifname); |
2fb975da TT |
152 | break; |
153 | } | |
896868a6 TT |
154 | ret |= linux_configure_arp(ifname, 1); |
155 | ret |= netlink_configure_arp(ifindex, af); | |
2fb975da TT |
156 | |
157 | return ret; | |
158 | } |