From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sat, 16 Apr 2005 15:20:36 -0700 Subject: Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! --- include/net/ip.h | 353 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 353 insertions(+) create mode 100644 include/net/ip.h (limited to 'include/net/ip.h') diff --git a/include/net/ip.h b/include/net/ip.h new file mode 100644 index 00000000000..b4db1375da2 --- /dev/null +++ b/include/net/ip.h @@ -0,0 +1,353 @@ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * Definitions for the IP module. + * + * Version: @(#)ip.h 1.0.2 05/07/93 + * + * Authors: Ross Biro, + * Fred N. van Kempen, + * Alan Cox, + * + * Changes: + * Mike McLagan : Routing by source + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ +#ifndef _IP_H +#define _IP_H + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct sock; + +struct inet_skb_parm +{ + struct ip_options opt; /* Compiled IP options */ + unsigned char flags; + +#define IPSKB_MASQUERADED 1 +#define IPSKB_TRANSLATED 2 +#define IPSKB_FORWARDED 4 +#define IPSKB_XFRM_TUNNEL_SIZE 8 +}; + +struct ipcm_cookie +{ + u32 addr; + int oif; + struct ip_options *opt; +}; + +#define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) + +struct ip_ra_chain +{ + struct ip_ra_chain *next; + struct sock *sk; + void (*destructor)(struct sock *); +}; + +extern struct ip_ra_chain *ip_ra_chain; +extern rwlock_t ip_ra_lock; + +/* IP flags. */ +#define IP_CE 0x8000 /* Flag: "Congestion" */ +#define IP_DF 0x4000 /* Flag: "Don't Fragment" */ +#define IP_MF 0x2000 /* Flag: "More Fragments" */ +#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ + +#define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ + +extern void ip_mc_dropsocket(struct sock *); +extern void ip_mc_dropdevice(struct net_device *dev); +extern int igmp_mc_proc_init(void); + +/* + * Functions provided by ip.c + */ + +extern int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, + u32 saddr, u32 daddr, + struct ip_options *opt); +extern int ip_rcv(struct sk_buff *skb, struct net_device *dev, + struct packet_type *pt); +extern int ip_local_deliver(struct sk_buff *skb); +extern int ip_mr_input(struct sk_buff *skb); +extern int ip_output(struct sk_buff *skb); +extern int ip_mc_output(struct sk_buff *skb); +extern int ip_fragment(struct sk_buff *skb, int (*out)(struct sk_buff*)); +extern int ip_do_nat(struct sk_buff *skb); +extern void ip_send_check(struct iphdr *ip); +extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok); +extern void ip_init(void); +extern int ip_append_data(struct sock *sk, + int getfrag(void *from, char *to, int offset, int len, + int odd, struct sk_buff *skb), + void *from, int len, int protolen, + struct ipcm_cookie *ipc, + struct rtable *rt, + unsigned int flags); +extern int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb); +extern ssize_t ip_append_page(struct sock *sk, struct page *page, + int offset, size_t size, int flags); +extern int ip_push_pending_frames(struct sock *sk); +extern void ip_flush_pending_frames(struct sock *sk); + +/* datagram.c */ +extern int ip4_datagram_connect(struct sock *sk, + struct sockaddr *uaddr, int addr_len); + +/* + * Map a multicast IP onto multicast MAC for type Token Ring. + * This conforms to RFC1469 Option 2 Multicasting i.e. + * using a functional address to transmit / receive + * multicast packets. + */ + +static inline void ip_tr_mc_map(u32 addr, char *buf) +{ + buf[0]=0xC0; + buf[1]=0x00; + buf[2]=0x00; + buf[3]=0x04; + buf[4]=0x00; + buf[5]=0x00; +} + +struct ip_reply_arg { + struct kvec iov[1]; + u32 csum; + int csumoffset; /* u16 offset of csum in iov[0].iov_base */ + /* -1 if not needed */ +}; + +void ip_send_reply(struct sock *sk, struct sk_buff *skb, struct ip_reply_arg *arg, + unsigned int len); + +extern int ip_finish_output(struct sk_buff *skb); + +struct ipv4_config +{ + int log_martians; + int autoconfig; + int no_pmtu_disc; +}; + +extern struct ipv4_config ipv4_config; +DECLARE_SNMP_STAT(struct ipstats_mib, ip_statistics); +#define IP_INC_STATS(field) SNMP_INC_STATS(ip_statistics, field) +#define IP_INC_STATS_BH(field) SNMP_INC_STATS_BH(ip_statistics, field) +#define IP_INC_STATS_USER(field) SNMP_INC_STATS_USER(ip_statistics, field) +DECLARE_SNMP_STAT(struct linux_mib, net_statistics); +#define NET_INC_STATS(field) SNMP_INC_STATS(net_statistics, field) +#define NET_INC_STATS_BH(field) SNMP_INC_STATS_BH(net_statistics, field) +#define NET_INC_STATS_USER(field) SNMP_INC_STATS_USER(net_statistics, field) +#define NET_ADD_STATS_BH(field, adnd) SNMP_ADD_STATS_BH(net_statistics, field, adnd) +#define NET_ADD_STATS_USER(field, adnd) SNMP_ADD_STATS_USER(net_statistics, field, adnd) + +extern int sysctl_local_port_range[2]; +extern int sysctl_ip_default_ttl; + +#ifdef CONFIG_INET +/* The function in 2.2 was invalid, producing wrong result for + * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ +static inline +int ip_decrease_ttl(struct iphdr *iph) +{ + u32 check = iph->check; + check += htons(0x0100); + iph->check = check + (check>=0xFFFF); + return --iph->ttl; +} + +static inline +int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) +{ + return (inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || + (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && + !(dst_metric(dst, RTAX_LOCK)&(1<frag_off & htons(IP_DF)) { + /* This is only to work around buggy Windows95/2000 + * VJ compression implementations. If the ID field + * does not change, they drop every other packet in + * a TCP stream using header compression. + */ + iph->id = (sk && inet_sk(sk)->daddr) ? + htons(inet_sk(sk)->id++) : 0; + } else + __ip_select_ident(iph, dst, 0); +} + +static inline void ip_select_ident_more(struct iphdr *iph, struct dst_entry *dst, struct sock *sk, int more) +{ + if (iph->frag_off & htons(IP_DF)) { + if (sk && inet_sk(sk)->daddr) { + iph->id = htons(inet_sk(sk)->id); + inet_sk(sk)->id += 1 + more; + } else + iph->id = 0; + } else + __ip_select_ident(iph, dst, more); +} + +/* + * Map a multicast IP onto multicast MAC for type ethernet. + */ + +static inline void ip_eth_mc_map(u32 addr, char *buf) +{ + addr=ntohl(addr); + buf[0]=0x01; + buf[1]=0x00; + buf[2]=0x5e; + buf[5]=addr&0xFF; + addr>>=8; + buf[4]=addr&0xFF; + addr>>=8; + buf[3]=addr&0x7F; +} + +/* + * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. + * Leave P_Key as 0 to be filled in by driver. + */ + +static inline void ip_ib_mc_map(u32 addr, char *buf) +{ + buf[0] = 0; /* Reserved */ + buf[1] = 0xff; /* Multicast QPN */ + buf[2] = 0xff; + buf[3] = 0xff; + addr = ntohl(addr); + buf[4] = 0xff; + buf[5] = 0x12; /* link local scope */ + buf[6] = 0x40; /* IPv4 signature */ + buf[7] = 0x1b; + buf[8] = 0; /* P_Key */ + buf[9] = 0; + buf[10] = 0; + buf[11] = 0; + buf[12] = 0; + buf[13] = 0; + buf[14] = 0; + buf[15] = 0; + buf[19] = addr & 0xff; + addr >>= 8; + buf[18] = addr & 0xff; + addr >>= 8; + buf[17] = addr & 0xff; + addr >>= 8; + buf[16] = addr & 0x0f; +} + +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) +#include +#endif + +static __inline__ void inet_reset_saddr(struct sock *sk) +{ + inet_sk(sk)->rcv_saddr = inet_sk(sk)->saddr = 0; +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + if (sk->sk_family == PF_INET6) { + struct ipv6_pinfo *np = inet6_sk(sk); + + memset(&np->saddr, 0, sizeof(np->saddr)); + memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); + } +#endif +} + +#endif + +extern int ip_call_ra_chain(struct sk_buff *skb); + +/* + * Functions provided by ip_fragment.o + */ + +enum ip_defrag_users +{ + IP_DEFRAG_LOCAL_DELIVER, + IP_DEFRAG_CALL_RA_CHAIN, + IP_DEFRAG_CONNTRACK_IN, + IP_DEFRAG_CONNTRACK_OUT, + IP_DEFRAG_NAT_OUT, + IP_DEFRAG_VS_IN, + IP_DEFRAG_VS_OUT, + IP_DEFRAG_VS_FWD +}; + +struct sk_buff *ip_defrag(struct sk_buff *skb, u32 user); +extern int ip_frag_nqueues; +extern atomic_t ip_frag_mem; + +/* + * Functions provided by ip_forward.c + */ + +extern int ip_forward(struct sk_buff *skb); +extern int ip_net_unreachable(struct sk_buff *skb); + +/* + * Functions provided by ip_options.c + */ + +extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt, u32 daddr, struct rtable *rt, int is_frag); +extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); +extern void ip_options_fragment(struct sk_buff *skb); +extern int ip_options_compile(struct ip_options *opt, struct sk_buff *skb); +extern int ip_options_get(struct ip_options **optp, unsigned char *data, int optlen, int user); +extern void ip_options_undo(struct ip_options * opt); +extern void ip_forward_options(struct sk_buff *skb); +extern int ip_options_rcv_srr(struct sk_buff *skb); + +/* + * Functions provided by ip_sockglue.c + */ + +extern void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); +extern int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc); +extern int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, int optlen); +extern int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); +extern int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *)); + +extern int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); +extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, + u16 port, u32 info, u8 *payload); +extern void ip_local_error(struct sock *sk, int err, u32 daddr, u16 dport, + u32 info); + +/* sysctl helpers - any sysctl which holds a value that ends up being + * fed into the routing cache should use these handlers. + */ +int ipv4_doint_and_flush(ctl_table *ctl, int write, + struct file* filp, void __user *buffer, + size_t *lenp, loff_t *ppos); +int ipv4_doint_and_flush_strategy(ctl_table *table, int __user *name, int nlen, + void __user *oldval, size_t __user *oldlenp, + void __user *newval, size_t newlen, + void **context); + +#endif /* _IP_H */ -- cgit v1.2.3