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-rw-r--r--include/net/ip.h353
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diff --git a/include/net/ip.h b/include/net/ip.h
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+++ b/include/net/ip.h
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+/*
+ * 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, <bir7@leland.Stanford.Edu>
+ * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ * Alan Cox, <gw4pts@gw4pts.ampr.org>
+ *
+ * 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 <linux/config.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/ip.h>
+#include <linux/in.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/in_route.h>
+#include <net/route.h>
+#include <net/arp.h>
+#include <net/snmp.h>
+
+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<<RTAX_MTU))));
+}
+
+extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
+
+static inline void ip_select_ident(struct iphdr *iph, struct dst_entry *dst, struct sock *sk)
+{
+ if (iph->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 <linux/ipv6.h>
+#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 */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.