Annotation of embedaddon/bird/sysdep/linux/sysio.h, revision 1.1.1.1
1.1 misho 1: /*
2: * BIRD Internet Routing Daemon -- Linux Multicasting and Network Includes
3: *
4: * (c) 1998--2000 Martin Mares <mj@ucw.cz>
5: *
6: * Can be freely distributed and used under the terms of the GNU GPL.
7: */
8:
9:
10: #ifndef HAVE_STRUCT_IP_MREQN
11: /* Several versions of glibc don't define this structure, so we have to do it ourselves */
12: struct ip_mreqn
13: {
14: struct in_addr imr_multiaddr; /* IP multicast address of group */
15: struct in_addr imr_address; /* local IP address of interface */
16: int imr_ifindex; /* Interface index */
17: };
18: #endif
19:
20: #ifndef IP_MINTTL
21: #define IP_MINTTL 21
22: #endif
23:
24: #ifndef IPV6_TCLASS
25: #define IPV6_TCLASS 67
26: #endif
27:
28: #ifndef IPV6_MINHOPCOUNT
29: #define IPV6_MINHOPCOUNT 73
30: #endif
31:
32:
33: #ifndef TCP_MD5SIG
34:
35: #define TCP_MD5SIG 14
36: #define TCP_MD5SIG_MAXKEYLEN 80
37:
38: struct tcp_md5sig {
39: struct sockaddr_storage tcpm_addr; /* address associated */
40: u16 __tcpm_pad1; /* zero */
41: u16 tcpm_keylen; /* key length */
42: u32 __tcpm_pad2; /* zero */
43: u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */
44: };
45:
46: #endif
47:
48:
49: /* Linux does not care if sa_len is larger than needed */
50: #define SA_LEN(x) sizeof(sockaddr)
51:
52:
53: /*
54: * Linux IPv4 multicast syscalls
55: */
56:
57: #define INIT_MREQ4(maddr,ifa) \
58: { .imr_multiaddr = ipa_to_in4(maddr), .imr_ifindex = ifa->index }
59:
60: static inline int
61: sk_setup_multicast4(sock *s)
62: {
63: struct ip_mreqn mr = { .imr_ifindex = s->iface->index };
64: int ttl = s->ttl;
65: int n = 0;
66:
67: /* This defines where should we send _outgoing_ multicasts */
68: if (setsockopt(s->fd, SOL_IP, IP_MULTICAST_IF, &mr, sizeof(mr)) < 0)
69: ERR("IP_MULTICAST_IF");
70:
71: if (setsockopt(s->fd, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
72: ERR("IP_MULTICAST_TTL");
73:
74: if (setsockopt(s->fd, SOL_IP, IP_MULTICAST_LOOP, &n, sizeof(n)) < 0)
75: ERR("IP_MULTICAST_LOOP");
76:
77: return 0;
78: }
79:
80: static inline int
81: sk_join_group4(sock *s, ip_addr maddr)
82: {
83: struct ip_mreqn mr = INIT_MREQ4(maddr, s->iface);
84:
85: if (setsockopt(s->fd, SOL_IP, IP_ADD_MEMBERSHIP, &mr, sizeof(mr)) < 0)
86: ERR("IP_ADD_MEMBERSHIP");
87:
88: return 0;
89: }
90:
91: static inline int
92: sk_leave_group4(sock *s, ip_addr maddr)
93: {
94: struct ip_mreqn mr = INIT_MREQ4(maddr, s->iface);
95:
96: if (setsockopt(s->fd, SOL_IP, IP_DROP_MEMBERSHIP, &mr, sizeof(mr)) < 0)
97: ERR("IP_DROP_MEMBERSHIP");
98:
99: return 0;
100: }
101:
102:
103: /*
104: * Linux IPv4 packet control messages
105: */
106:
107: /* Mostly similar to standardized IPv6 code */
108:
109: #define CMSG4_SPACE_PKTINFO CMSG_SPACE(sizeof(struct in_pktinfo))
110: #define CMSG4_SPACE_TTL CMSG_SPACE(sizeof(int))
111:
112: static inline int
113: sk_request_cmsg4_pktinfo(sock *s)
114: {
115: int y = 1;
116:
117: if (setsockopt(s->fd, SOL_IP, IP_PKTINFO, &y, sizeof(y)) < 0)
118: ERR("IP_PKTINFO");
119:
120: return 0;
121: }
122:
123: static inline int
124: sk_request_cmsg4_ttl(sock *s)
125: {
126: int y = 1;
127:
128: if (setsockopt(s->fd, SOL_IP, IP_RECVTTL, &y, sizeof(y)) < 0)
129: ERR("IP_RECVTTL");
130:
131: return 0;
132: }
133:
134: static inline void
135: sk_process_cmsg4_pktinfo(sock *s, struct cmsghdr *cm)
136: {
137: if (cm->cmsg_type == IP_PKTINFO)
138: {
139: struct in_pktinfo *pi = (struct in_pktinfo *) CMSG_DATA(cm);
140: s->laddr = ipa_from_in4(pi->ipi_addr);
141: s->lifindex = pi->ipi_ifindex;
142: }
143: }
144:
145: static inline void
146: sk_process_cmsg4_ttl(sock *s, struct cmsghdr *cm)
147: {
148: if (cm->cmsg_type == IP_TTL)
149: s->rcv_ttl = * (int *) CMSG_DATA(cm);
150: }
151:
152: static inline void
153: sk_prepare_cmsgs4(sock *s, struct msghdr *msg, void *cbuf, size_t cbuflen)
154: {
155: struct cmsghdr *cm;
156: struct in_pktinfo *pi;
157: int controllen = 0;
158:
159: msg->msg_control = cbuf;
160: msg->msg_controllen = cbuflen;
161:
162: cm = CMSG_FIRSTHDR(msg);
163: cm->cmsg_level = SOL_IP;
164: cm->cmsg_type = IP_PKTINFO;
165: cm->cmsg_len = CMSG_LEN(sizeof(*pi));
166: controllen += CMSG_SPACE(sizeof(*pi));
167:
168: pi = (struct in_pktinfo *) CMSG_DATA(cm);
169: pi->ipi_ifindex = s->iface ? s->iface->index : 0;
170: pi->ipi_spec_dst = ipa_to_in4(s->saddr);
171: pi->ipi_addr = ipa_to_in4(IPA_NONE);
172:
173: msg->msg_controllen = controllen;
174: }
175:
176:
177: /*
178: * Miscellaneous Linux socket syscalls
179: */
180:
181: int
182: sk_set_md5_auth(sock *s, ip_addr local UNUSED, ip_addr remote, struct iface *ifa, char *passwd, int setkey UNUSED)
183: {
184: struct tcp_md5sig md5;
185:
186: memset(&md5, 0, sizeof(md5));
187: sockaddr_fill((sockaddr *) &md5.tcpm_addr, s->af, remote, ifa, 0);
188:
189: if (passwd)
190: {
191: int len = strlen(passwd);
192:
193: if (len > TCP_MD5SIG_MAXKEYLEN)
194: ERR_MSG("The password for TCP MD5 Signature is too long");
195:
196: md5.tcpm_keylen = len;
197: memcpy(&md5.tcpm_key, passwd, len);
198: }
199:
200: if (setsockopt(s->fd, SOL_TCP, TCP_MD5SIG, &md5, sizeof(md5)) < 0)
201: {
202: if (errno == ENOPROTOOPT)
203: ERR_MSG("Kernel does not support TCP MD5 signatures");
204: else
205: ERR("TCP_MD5SIG");
206: }
207:
208: return 0;
209: }
210:
211: static inline int
212: sk_set_min_ttl4(sock *s, int ttl)
213: {
214: if (setsockopt(s->fd, SOL_IP, IP_MINTTL, &ttl, sizeof(ttl)) < 0)
215: {
216: if (errno == ENOPROTOOPT)
217: ERR_MSG("Kernel does not support IPv4 TTL security");
218: else
219: ERR("IP_MINTTL");
220: }
221:
222: return 0;
223: }
224:
225: static inline int
226: sk_set_min_ttl6(sock *s, int ttl)
227: {
228: if (setsockopt(s->fd, SOL_IPV6, IPV6_MINHOPCOUNT, &ttl, sizeof(ttl)) < 0)
229: {
230: if (errno == ENOPROTOOPT)
231: ERR_MSG("Kernel does not support IPv6 TTL security");
232: else
233: ERR("IPV6_MINHOPCOUNT");
234: }
235:
236: return 0;
237: }
238:
239: static inline int
240: sk_disable_mtu_disc4(sock *s)
241: {
242: int dont = IP_PMTUDISC_DONT;
243:
244: if (setsockopt(s->fd, SOL_IP, IP_MTU_DISCOVER, &dont, sizeof(dont)) < 0)
245: ERR("IP_MTU_DISCOVER");
246:
247: return 0;
248: }
249:
250: static inline int
251: sk_disable_mtu_disc6(sock *s)
252: {
253: int dont = IPV6_PMTUDISC_DONT;
254:
255: if (setsockopt(s->fd, SOL_IPV6, IPV6_MTU_DISCOVER, &dont, sizeof(dont)) < 0)
256: ERR("IPV6_MTU_DISCOVER");
257:
258: return 0;
259: }
260:
261: int sk_priority_control = 7;
262:
263: static inline int
264: sk_set_priority(sock *s, int prio)
265: {
266: if (setsockopt(s->fd, SOL_SOCKET, SO_PRIORITY, &prio, sizeof(prio)) < 0)
267: ERR("SO_PRIORITY");
268:
269: return 0;
270: }
271:
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