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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 | ||
372b8878 | 10 | #include "zebra.h" |
5b4f4e62 DL |
11 | |
12 | #include <errno.h> | |
aea6c49e | 13 | #include <linux/if_packet.h> |
2fb975da TT |
14 | |
15 | #include "nhrp_protocol.h" | |
16 | #include "os.h" | |
2fb975da | 17 | |
ca317495 RD |
18 | #ifndef HAVE_STRLCPY |
19 | size_t strlcpy(char *__restrict dest, | |
c2bb9917 | 20 | const char *__restrict src, size_t destsize); |
ca317495 RD |
21 | #endif |
22 | ||
2fb975da TT |
23 | static int nhrp_socket_fd = -1; |
24 | ||
25 | int os_socket(void) | |
26 | { | |
27 | if (nhrp_socket_fd < 0) | |
996c9314 LB |
28 | nhrp_socket_fd = |
29 | socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_NHRP)); | |
2fb975da TT |
30 | return nhrp_socket_fd; |
31 | } | |
32 | ||
996c9314 | 33 | int os_sendmsg(const uint8_t *buf, size_t len, int ifindex, const uint8_t *addr, |
fa31fcf2 | 34 | size_t addrlen, uint16_t protocol) |
2fb975da TT |
35 | { |
36 | struct sockaddr_ll lladdr; | |
37 | struct iovec iov = { | |
996c9314 | 38 | .iov_base = (void *)buf, .iov_len = len, |
2fb975da TT |
39 | }; |
40 | struct msghdr msg = { | |
41 | .msg_name = &lladdr, | |
42 | .msg_namelen = sizeof(lladdr), | |
43 | .msg_iov = &iov, | |
44 | .msg_iovlen = 1, | |
45 | }; | |
f5a1fb4f | 46 | int status, fd; |
2fb975da TT |
47 | |
48 | if (addrlen > sizeof(lladdr.sll_addr)) | |
49 | return -1; | |
50 | ||
51 | memset(&lladdr, 0, sizeof(lladdr)); | |
52 | lladdr.sll_family = AF_PACKET; | |
fa31fcf2 | 53 | lladdr.sll_protocol = htons(protocol); |
2fb975da TT |
54 | lladdr.sll_ifindex = ifindex; |
55 | lladdr.sll_halen = addrlen; | |
56 | memcpy(lladdr.sll_addr, addr, addrlen); | |
57 | ||
f5a1fb4f MS |
58 | fd = os_socket(); |
59 | if (fd < 0) | |
60 | return -1; | |
61 | ||
62 | status = sendmsg(fd, &msg, 0); | |
2fb975da | 63 | if (status < 0) |
fa31fcf2 | 64 | return -errno; |
2fb975da | 65 | |
fa31fcf2 | 66 | return status; |
2fb975da TT |
67 | } |
68 | ||
996c9314 LB |
69 | int os_recvmsg(uint8_t *buf, size_t *len, int *ifindex, uint8_t *addr, |
70 | size_t *addrlen) | |
2fb975da TT |
71 | { |
72 | struct sockaddr_ll lladdr; | |
73 | struct iovec iov = { | |
996c9314 | 74 | .iov_base = buf, .iov_len = *len, |
2fb975da TT |
75 | }; |
76 | struct msghdr msg = { | |
77 | .msg_name = &lladdr, | |
78 | .msg_namelen = sizeof(lladdr), | |
79 | .msg_iov = &iov, | |
80 | .msg_iovlen = 1, | |
81 | }; | |
82 | int r; | |
83 | ||
84 | r = recvmsg(nhrp_socket_fd, &msg, MSG_DONTWAIT); | |
85 | if (r < 0) | |
86 | return r; | |
87 | ||
88 | *len = r; | |
89 | *ifindex = lladdr.sll_ifindex; | |
90 | ||
996c9314 | 91 | if (*addrlen <= (size_t)lladdr.sll_addr) { |
2fb975da TT |
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; | |
95 | } else { | |
96 | *addrlen = 0; | |
97 | } | |
98 | } | |
99 | ||
100 | return 0; | |
101 | } | |
102 | ||
103 | static int linux_configure_arp(const char *iface, int on) | |
104 | { | |
105 | struct ifreq ifr; | |
106 | ||
ca317495 | 107 | strlcpy(ifr.ifr_name, iface, IFNAMSIZ); |
2fb975da TT |
108 | if (ioctl(nhrp_socket_fd, SIOCGIFFLAGS, &ifr)) |
109 | return -1; | |
110 | ||
111 | if (on) | |
112 | ifr.ifr_flags &= ~IFF_NOARP; | |
113 | else | |
114 | ifr.ifr_flags |= IFF_NOARP; | |
115 | ||
116 | if (ioctl(nhrp_socket_fd, SIOCSIFFLAGS, &ifr)) | |
117 | return -1; | |
118 | ||
119 | return 0; | |
120 | } | |
121 | ||
122 | static int linux_icmp_redirect_off(const char *iface) | |
123 | { | |
2b7165e7 | 124 | char fname[PATH_MAX]; |
2fb975da TT |
125 | int fd, ret = -1; |
126 | ||
772270f3 QY |
127 | snprintf(fname, sizeof(fname), |
128 | "/proc/sys/net/ipv4/conf/%s/send_redirects", iface); | |
2fb975da TT |
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 | { | |
896868a6 | 141 | int ret = 0; |
2fb975da TT |
142 | |
143 | switch (af) { | |
144 | case AF_INET: | |
896868a6 | 145 | ret |= linux_icmp_redirect_off("all"); |
2fb975da | 146 | ret |= linux_icmp_redirect_off(ifname); |
2fb975da TT |
147 | break; |
148 | } | |
896868a6 | 149 | ret |= linux_configure_arp(ifname, 1); |
2fb975da TT |
150 | |
151 | return ret; | |
152 | } |