1: /*
2: * BIRD Socket Interface
3: *
4: * (c) 1998--2004 Martin Mares <mj@ucw.cz>
5: *
6: * Can be freely distributed and used under the terms of the GNU GPL.
7: */
8:
9: #ifndef _BIRD_SOCKET_H_
10: #define _BIRD_SOCKET_H_
11:
12: #include <errno.h>
13: // #include <sys/socket.h>
14:
15: #include "lib/resource.h"
16:
17: typedef struct birdsock {
18: resource r;
19: pool *pool; /* Pool where incoming connections should be allocated (for SK_xxx_PASSIVE) */
20: int type; /* Socket type */
21: void *data; /* User data */
22: ip_addr saddr, daddr; /* IPA_NONE = unspecified */
23: uint sport, dport; /* 0 = unspecified (for IP: protocol type) */
24: int tos; /* TOS / traffic class, -1 = default */
25: int priority; /* Local socket priority, -1 = default */
26: int ttl; /* Time To Live, -1 = default */
27: u32 flags;
28: struct iface *iface; /* Interface; specify this for broad/multicast sockets */
29:
30: byte *rbuf, *rpos; /* NULL=allocate automatically */
31: uint fast_rx; /* RX has higher priority in event loop */
32: uint rbsize;
33: int (*rx_hook)(struct birdsock *, uint size); /* NULL=receiving turned off, returns 1 to clear rx buffer */
34:
35: byte *tbuf, *tpos; /* NULL=allocate automatically */
36: byte *ttx; /* Internal */
37: uint tbsize;
38: void (*tx_hook)(struct birdsock *);
39:
40: void (*err_hook)(struct birdsock *, int); /* errno or zero if EOF */
41:
42: /* Information about received datagrams (UDP, RAW), valid in rx_hook */
43: ip_addr faddr, laddr; /* src (From) and dst (Local) address of the datagram */
44: uint fport; /* src port of the datagram */
45: uint lifindex; /* local interface that received the datagram */
46: /* laddr and lifindex are valid only if SKF_LADDR_RX flag is set to request it */
47:
48: int af; /* Address family (AF_INET, AF_INET6 or 0 for non-IP) of fd */
49: int fd; /* System-dependent data */
50: int index; /* Index in poll buffer */
51: int rcv_ttl; /* TTL of last received datagram */
52: node n;
53: void *rbuf_alloc, *tbuf_alloc;
54: char *password; /* Password for MD5 authentication */
55: char *err; /* Error message */
56: } sock;
57:
58: sock *sock_new(pool *); /* Allocate new socket */
59: #define sk_new(X) sock_new(X) /* Wrapper to avoid name collision with OpenSSL */
60:
61: int sk_open(sock *); /* Open socket */
62: int sk_rx_ready(sock *s);
63: int sk_send(sock *, uint len); /* Send data, <0=err, >0=ok, 0=sleep */
64: int sk_send_to(sock *, uint len, ip_addr to, uint port); /* sk_send to given destination */
65: void sk_reallocate(sock *); /* Free and allocate tbuf & rbuf */
66: void sk_set_rbsize(sock *s, uint val); /* Resize RX buffer */
67: void sk_set_tbsize(sock *s, uint val); /* Resize TX buffer, keeping content */
68: void sk_set_tbuf(sock *s, void *tbuf); /* Switch TX buffer, NULL-> return to internal */
69: void sk_dump_all(void);
70:
71: static inline int sk_send_buffer_empty(sock *sk)
72: { return sk->tbuf == sk->tpos; }
73:
74:
75: #ifdef IPV6
76: #define sk_is_ipv4(X) 0
77: #define sk_is_ipv6(X) 1
78: #else
79: #define sk_is_ipv4(X) 1
80: #define sk_is_ipv6(X) 0
81: #endif
82:
83:
84: int sk_setup_multicast(sock *s); /* Prepare UDP or IP socket for multicasting */
85: int sk_join_group(sock *s, ip_addr maddr); /* Join multicast group on sk iface */
86: int sk_leave_group(sock *s, ip_addr maddr); /* Leave multicast group on sk iface */
87: int sk_setup_broadcast(sock *s);
88: int sk_set_ttl(sock *s, int ttl); /* Set transmit TTL for given socket */
89: int sk_set_min_ttl(sock *s, int ttl); /* Set minimal accepted TTL for given socket */
90: int sk_set_md5_auth(sock *s, ip_addr local, ip_addr remote, struct iface *ifa, char *passwd, int setkey);
91: int sk_set_ipv6_checksum(sock *s, int offset);
92: int sk_set_icmp6_filter(sock *s, int p1, int p2);
93: void sk_log_error(sock *s, const char *p);
94:
95: byte * sk_rx_buffer(sock *s, int *len); /* Temporary */
96:
97: extern int sk_priority_control; /* Suggested priority for control traffic, should be sysdep define */
98:
99:
100: /* Socket flags */
101:
102: #define SKF_V4ONLY 0x01 /* Use IPv4 for IP sockets */
103: #define SKF_V6ONLY 0x02 /* Use IPV6_V6ONLY socket option */
104: #define SKF_LADDR_RX 0x04 /* Report local address for RX packets */
105: #define SKF_TTL_RX 0x08 /* Report TTL / Hop Limit for RX packets */
106: #define SKF_BIND 0x10 /* Bind datagram socket to given source address */
107: #define SKF_HIGH_PORT 0x20 /* Choose port from high range if possible */
108:
109: #define SKF_THREAD 0x100 /* Socked used in thread, Do not add to main loop */
110: #define SKF_TRUNCATED 0x200 /* Received packet was truncated, set by IO layer */
111: #define SKF_HDRINCL 0x400 /* Used internally */
112: #define SKF_PKTINFO 0x800 /* Used internally */
113:
114: /*
115: * Socket types SA SP DA DP IF TTL SendTo (?=may, -=must not, *=must)
116: */
117:
118: #define SK_TCP_PASSIVE 0 /* ? * - - - ? - */
119: #define SK_TCP_ACTIVE 1 /* ? ? * * - ? - */
120: #define SK_TCP 2
121: #define SK_UDP 3 /* ? ? ? ? ? ? ? */
122: #define SK_IP 5 /* ? - ? * ? ? ? */
123: #define SK_MAGIC 7 /* Internal use by sysdep code */
124: #define SK_UNIX_PASSIVE 8
125: #define SK_UNIX 9
126:
127: /*
128: * For SK_UDP or SK_IP sockets setting DA/DP allows to use sk_send(),
129: * otherwise sk_send_to() must be used.
130: *
131: * For SK_IP sockets setting DP specifies protocol number, which is used
132: * for both receiving and sending.
133: *
134: * For multicast on SK_UDP or SK_IP sockets set IF and TTL,
135: * call sk_setup_multicast() to enable multicast on that socket,
136: * and then use sk_join_group() and sk_leave_group() to manage
137: * a set of received multicast groups.
138: *
139: * For datagram (SK_UDP, SK_IP) sockets, there are two ways to handle
140: * source address. The socket could be bound to it using bind()
141: * syscall, but that also forbids the reception of multicast packets,
142: * or the address could be set on per-packet basis using platform
143: * dependent options (but these are not available in some corner
144: * cases). The first way is used when SKF_BIND is specified, the
145: * second way is used otherwise.
146: */
147:
148: #endif
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