Annotation of embedaddon/bird2/sysdep/linux/sysio.h, revision 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 IP_MINTTL
! 11: #define IP_MINTTL 21
! 12: #endif
! 13:
! 14: #ifndef IPV6_TCLASS
! 15: #define IPV6_TCLASS 67
! 16: #endif
! 17:
! 18: #ifndef IPV6_MINHOPCOUNT
! 19: #define IPV6_MINHOPCOUNT 73
! 20: #endif
! 21:
! 22:
! 23: #ifndef TCP_MD5SIG
! 24:
! 25: #define TCP_MD5SIG 14
! 26: #define TCP_MD5SIG_MAXKEYLEN 80
! 27:
! 28: struct tcp_md5sig {
! 29: struct sockaddr_storage tcpm_addr; /* address associated */
! 30: u16 __tcpm_pad1; /* zero */
! 31: u16 tcpm_keylen; /* key length */
! 32: u32 __tcpm_pad2; /* zero */
! 33: u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */
! 34: };
! 35:
! 36: #endif
! 37:
! 38:
! 39: /* Linux does not care if sa_len is larger than needed */
! 40: #define SA_LEN(x) sizeof(sockaddr)
! 41:
! 42:
! 43: /*
! 44: * Linux IPv4 multicast syscalls
! 45: */
! 46:
! 47: #define INIT_MREQ4(maddr,ifa) \
! 48: { .imr_multiaddr = ipa_to_in4(maddr), .imr_ifindex = ifa->index }
! 49:
! 50: static inline int
! 51: sk_setup_multicast4(sock *s)
! 52: {
! 53: struct ip_mreqn mr = { .imr_ifindex = s->iface->index };
! 54: int ttl = s->ttl;
! 55: int n = 0;
! 56:
! 57: /* This defines where should we send _outgoing_ multicasts */
! 58: if (setsockopt(s->fd, SOL_IP, IP_MULTICAST_IF, &mr, sizeof(mr)) < 0)
! 59: ERR("IP_MULTICAST_IF");
! 60:
! 61: if (setsockopt(s->fd, SOL_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
! 62: ERR("IP_MULTICAST_TTL");
! 63:
! 64: if (setsockopt(s->fd, SOL_IP, IP_MULTICAST_LOOP, &n, sizeof(n)) < 0)
! 65: ERR("IP_MULTICAST_LOOP");
! 66:
! 67: return 0;
! 68: }
! 69:
! 70: static inline int
! 71: sk_join_group4(sock *s, ip_addr maddr)
! 72: {
! 73: struct ip_mreqn mr = INIT_MREQ4(maddr, s->iface);
! 74:
! 75: if (setsockopt(s->fd, SOL_IP, IP_ADD_MEMBERSHIP, &mr, sizeof(mr)) < 0)
! 76: ERR("IP_ADD_MEMBERSHIP");
! 77:
! 78: return 0;
! 79: }
! 80:
! 81: static inline int
! 82: sk_leave_group4(sock *s, ip_addr maddr)
! 83: {
! 84: struct ip_mreqn mr = INIT_MREQ4(maddr, s->iface);
! 85:
! 86: if (setsockopt(s->fd, SOL_IP, IP_DROP_MEMBERSHIP, &mr, sizeof(mr)) < 0)
! 87: ERR("IP_DROP_MEMBERSHIP");
! 88:
! 89: return 0;
! 90: }
! 91:
! 92:
! 93: /*
! 94: * Linux IPv4 packet control messages
! 95: */
! 96:
! 97: /* Mostly similar to standardized IPv6 code */
! 98:
! 99: #define CMSG4_SPACE_PKTINFO CMSG_SPACE(sizeof(struct in_pktinfo))
! 100: #define CMSG4_SPACE_TTL CMSG_SPACE(sizeof(int))
! 101:
! 102: static inline int
! 103: sk_request_cmsg4_pktinfo(sock *s)
! 104: {
! 105: int y = 1;
! 106:
! 107: if (setsockopt(s->fd, SOL_IP, IP_PKTINFO, &y, sizeof(y)) < 0)
! 108: ERR("IP_PKTINFO");
! 109:
! 110: return 0;
! 111: }
! 112:
! 113: static inline int
! 114: sk_request_cmsg4_ttl(sock *s)
! 115: {
! 116: int y = 1;
! 117:
! 118: if (setsockopt(s->fd, SOL_IP, IP_RECVTTL, &y, sizeof(y)) < 0)
! 119: ERR("IP_RECVTTL");
! 120:
! 121: return 0;
! 122: }
! 123:
! 124: static inline void
! 125: sk_process_cmsg4_pktinfo(sock *s, struct cmsghdr *cm)
! 126: {
! 127: if (cm->cmsg_type == IP_PKTINFO)
! 128: {
! 129: struct in_pktinfo *pi = (struct in_pktinfo *) CMSG_DATA(cm);
! 130: s->laddr = ipa_from_in4(pi->ipi_addr);
! 131: s->lifindex = pi->ipi_ifindex;
! 132: }
! 133: }
! 134:
! 135: static inline void
! 136: sk_process_cmsg4_ttl(sock *s, struct cmsghdr *cm)
! 137: {
! 138: if (cm->cmsg_type == IP_TTL)
! 139: s->rcv_ttl = * (int *) CMSG_DATA(cm);
! 140: }
! 141:
! 142: static inline void
! 143: sk_prepare_cmsgs4(sock *s, struct msghdr *msg, void *cbuf, size_t cbuflen)
! 144: {
! 145: struct cmsghdr *cm;
! 146: struct in_pktinfo *pi;
! 147: int controllen = 0;
! 148:
! 149: msg->msg_control = cbuf;
! 150: msg->msg_controllen = cbuflen;
! 151:
! 152: cm = CMSG_FIRSTHDR(msg);
! 153: cm->cmsg_level = SOL_IP;
! 154: cm->cmsg_type = IP_PKTINFO;
! 155: cm->cmsg_len = CMSG_LEN(sizeof(*pi));
! 156: controllen += CMSG_SPACE(sizeof(*pi));
! 157:
! 158: pi = (struct in_pktinfo *) CMSG_DATA(cm);
! 159: pi->ipi_ifindex = s->iface ? s->iface->index : 0;
! 160: pi->ipi_spec_dst = ipa_to_in4(s->saddr);
! 161: pi->ipi_addr = ipa_to_in4(IPA_NONE);
! 162:
! 163: msg->msg_controllen = controllen;
! 164: }
! 165:
! 166:
! 167: /*
! 168: * Miscellaneous Linux socket syscalls
! 169: */
! 170:
! 171: int
! 172: sk_set_md5_auth(sock *s, ip_addr local UNUSED, ip_addr remote, struct iface *ifa, char *passwd, int setkey UNUSED)
! 173: {
! 174: struct tcp_md5sig md5;
! 175:
! 176: memset(&md5, 0, sizeof(md5));
! 177: sockaddr_fill((sockaddr *) &md5.tcpm_addr, s->af, remote, ifa, 0);
! 178:
! 179: if (passwd)
! 180: {
! 181: int len = strlen(passwd);
! 182:
! 183: if (len > TCP_MD5SIG_MAXKEYLEN)
! 184: ERR_MSG("The password for TCP MD5 Signature is too long");
! 185:
! 186: md5.tcpm_keylen = len;
! 187: memcpy(&md5.tcpm_key, passwd, len);
! 188: }
! 189:
! 190: if (setsockopt(s->fd, SOL_TCP, TCP_MD5SIG, &md5, sizeof(md5)) < 0)
! 191: {
! 192: if (errno == ENOPROTOOPT)
! 193: ERR_MSG("Kernel does not support TCP MD5 signatures");
! 194: else
! 195: ERR("TCP_MD5SIG");
! 196: }
! 197:
! 198: return 0;
! 199: }
! 200:
! 201: static inline int
! 202: sk_set_min_ttl4(sock *s, int ttl)
! 203: {
! 204: if (setsockopt(s->fd, SOL_IP, IP_MINTTL, &ttl, sizeof(ttl)) < 0)
! 205: {
! 206: if (errno == ENOPROTOOPT)
! 207: ERR_MSG("Kernel does not support IPv4 TTL security");
! 208: else
! 209: ERR("IP_MINTTL");
! 210: }
! 211:
! 212: return 0;
! 213: }
! 214:
! 215: static inline int
! 216: sk_set_min_ttl6(sock *s, int ttl)
! 217: {
! 218: if (setsockopt(s->fd, SOL_IPV6, IPV6_MINHOPCOUNT, &ttl, sizeof(ttl)) < 0)
! 219: {
! 220: if (errno == ENOPROTOOPT)
! 221: ERR_MSG("Kernel does not support IPv6 TTL security");
! 222: else
! 223: ERR("IPV6_MINHOPCOUNT");
! 224: }
! 225:
! 226: return 0;
! 227: }
! 228:
! 229: static inline int
! 230: sk_disable_mtu_disc4(sock *s)
! 231: {
! 232: int dont = IP_PMTUDISC_DONT;
! 233:
! 234: if (setsockopt(s->fd, SOL_IP, IP_MTU_DISCOVER, &dont, sizeof(dont)) < 0)
! 235: ERR("IP_MTU_DISCOVER");
! 236:
! 237: return 0;
! 238: }
! 239:
! 240: static inline int
! 241: sk_disable_mtu_disc6(sock *s)
! 242: {
! 243: int dont = IPV6_PMTUDISC_DONT;
! 244:
! 245: if (setsockopt(s->fd, SOL_IPV6, IPV6_MTU_DISCOVER, &dont, sizeof(dont)) < 0)
! 246: ERR("IPV6_MTU_DISCOVER");
! 247:
! 248: return 0;
! 249: }
! 250:
! 251: int sk_priority_control = 7;
! 252:
! 253: static inline int
! 254: sk_set_priority(sock *s, int prio)
! 255: {
! 256: if (setsockopt(s->fd, SOL_SOCKET, SO_PRIORITY, &prio, sizeof(prio)) < 0)
! 257: ERR("SO_PRIORITY");
! 258:
! 259: return 0;
! 260: }
! 261:
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