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1.1 root 1: /*
2: * INET An implementation of the TCP/IP protocol suite for the LINUX
3: * operating system. INET is implemented using the BSD Socket
4: * interface as the means of communication with the user level.
5: *
6: * Definitions for the IP module.
7: *
8: * Version: @(#)ip.h 1.0.2 05/07/93
9: *
10: * Authors: Ross Biro, <[email protected]>
11: * Fred N. van Kempen, <[email protected]>
12: * Alan Cox, <[email protected]>
13: *
14: * This program is free software; you can redistribute it and/or
15: * modify it under the terms of the GNU General Public License
16: * as published by the Free Software Foundation; either version
17: * 2 of the License, or (at your option) any later version.
18: */
19: #ifndef _IP_H
20: #define _IP_H
21:
22:
23: #include <linux/config.h>
24: #include <linux/types.h>
25: #include <linux/socket.h>
26: #include <linux/ip.h>
27: #include <linux/netdevice.h>
28: #include <net/route.h>
29:
30: #ifndef _SNMP_H
31: #include <net/snmp.h>
32: #endif
33:
34: #include <net/sock.h> /* struct sock */
35:
36: /* IP flags. */
37: #define IP_CE 0x8000 /* Flag: "Congestion" */
38: #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
39: #define IP_MF 0x2000 /* Flag: "More Fragments" */
40: #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
41:
42: #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
43:
44: #ifdef CONFIG_IP_MULTICAST
45: extern void ip_mc_dropsocket(struct sock *);
46: extern void ip_mc_dropdevice(struct device *dev);
47: extern int ip_mc_procinfo(char *, char **, off_t, int, int);
48: #endif
49:
50: #include <net/ip_forward.h>
51:
52: /* Describe an IP fragment. */
53: struct ipfrag
54: {
55: int offset; /* offset of fragment in IP datagram */
56: int end; /* last byte of data in datagram */
57: int len; /* length of this fragment */
58: struct sk_buff *skb; /* complete received fragment */
59: unsigned char *ptr; /* pointer into real fragment data */
60: struct ipfrag *next; /* linked list pointers */
61: struct ipfrag *prev;
62: };
63:
64: /*
65: * Describe an entry in the "incomplete datagrams" queue.
66: */
67:
68: struct ipq
69: {
70: unsigned char *mac; /* pointer to MAC header */
71: struct iphdr *iph; /* pointer to IP header */
72: int len; /* total length of original datagram */
73: short ihlen; /* length of the IP header */
74: short maclen; /* length of the MAC header */
75: struct timer_list timer; /* when will this queue expire? */
76: struct ipfrag *fragments; /* linked list of received fragments */
77: struct ipq *next; /* linked list pointers */
78: struct ipq *prev;
79: struct device *dev; /* Device - for icmp replies */
80: };
81:
82: /*
83: * Functions provided by ip.c
84: */
85:
86: extern void ip_print(const struct iphdr *ip);
87: extern int ip_ioctl(struct sock *sk, int cmd, unsigned long arg);
88: extern void ip_route_check(__u32 daddr);
89: extern int ip_send(struct rtable *rt, struct sk_buff *skb, __u32 daddr, int len, struct device *dev, __u32 saddr);
90: extern int ip_build_header(struct sk_buff *skb,
91: __u32 saddr,
92: __u32 daddr,
93: struct device **dev, int type,
94: struct options *opt, int len,
95: int tos,int ttl,struct rtable **rp);
96: extern int ip_rcv(struct sk_buff *skb, struct device *dev,
97: struct packet_type *pt);
98: extern int ip_options_echo(struct options * dopt, struct options * sopt,
99: __u32 daddr, __u32 saddr,
100: struct sk_buff * skb);
101: extern int ip_options_compile(struct options * opt, struct sk_buff * skb);
102: extern void ip_send_check(struct iphdr *ip);
103: extern int ip_id_count;
104: extern void ip_queue_xmit(struct sock *sk,
105: struct device *dev, struct sk_buff *skb,
106: int free);
107: extern void ip_init(void);
108: extern int ip_build_xmit(struct sock *sk,
109: void getfrag (const void *,
110: __u32,
111: char *,
112: unsigned int,
113: unsigned int),
114: const void *frag,
115: unsigned short int length,
116: __u32 daddr,
117: __u32 saddr,
118: struct options * opt,
119: int flags,
120: int type,
121: int noblock);
122:
123: extern struct ip_mib ip_statistics;
124:
125: extern int sysctl_ip_dynaddr;
126: int ip_rewrite_addrs(struct sock *sk, struct sk_buff *skb, struct device *dev);
127:
128: /*
129: * Functions provided by ip_fragment.o
130: */
131:
132: struct sk_buff *ip_defrag(struct iphdr *iph, struct sk_buff *skb, struct device *dev);
133: void ip_fragment(struct sock *sk, struct sk_buff *skb, struct device *dev, int is_frag);
134:
135: /*
136: * Functions provided by ip_forward.c
137: */
138:
139: extern int ip_forward(struct sk_buff *skb, struct device *dev, int is_frag, __u32 target_addr);
140: extern int sysctl_ip_forward;
141:
142:
143: /*
144: * Functions provided by ip_options.c
145: */
146:
147: extern void ip_options_build(struct sk_buff *skb, struct options *opt, __u32 daddr, __u32 saddr, int is_frag);
148: extern int ip_options_echo(struct options *dopt, struct options *sopt, __u32 daddr, __u32 saddr, struct sk_buff *skb);
149: extern void ip_options_fragment(struct sk_buff *skb);
150: extern int ip_options_compile(struct options *opt, struct sk_buff *skb);
151:
152: /*
153: * Functions provided by ip_sockglue.c
154: */
155:
156: extern int ip_setsockopt(struct sock *sk, int level, int optname, char *optval, int optlen);
157: extern int ip_getsockopt(struct sock *sk, int level, int optname, char *optval, int *optlen);
158:
159: #endif /* _IP_H */
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