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Linux/include/net/ip.h

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  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
 11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 12  *              Alan Cox, <gw4pts@gw4pts.ampr.org>
 13  *
 14  * Changes:
 15  *              Mike McLagan    :       Routing by source
 16  *
 17  *              This program is free software; you can redistribute it and/or
 18  *              modify it under the terms of the GNU General Public License
 19  *              as published by the Free Software Foundation; either version
 20  *              2 of the License, or (at your option) any later version.
 21  */
 22 #ifndef _IP_H
 23 #define _IP_H
 24 
 25 #include <linux/types.h>
 26 #include <linux/ip.h>
 27 #include <linux/in.h>
 28 #include <linux/skbuff.h>
 29 
 30 #include <net/inet_sock.h>
 31 #include <net/snmp.h>
 32 #include <net/flow.h>
 33 
 34 struct sock;
 35 
 36 struct inet_skb_parm {
 37         struct ip_options       opt;            /* Compiled IP options          */
 38         unsigned char           flags;
 39 
 40 #define IPSKB_FORWARDED         1
 41 #define IPSKB_XFRM_TUNNEL_SIZE  2
 42 #define IPSKB_XFRM_TRANSFORMED  4
 43 #define IPSKB_FRAG_COMPLETE     8
 44 #define IPSKB_REROUTED          16
 45 
 46         u16                     frag_max_size;
 47 };
 48 
 49 static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
 50 {
 51         return ip_hdr(skb)->ihl * 4;
 52 }
 53 
 54 struct ipcm_cookie {
 55         __be32                  addr;
 56         int                     oif;
 57         struct ip_options_rcu   *opt;
 58         __u8                    tx_flags;
 59 };
 60 
 61 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
 62 
 63 struct ip_ra_chain {
 64         struct ip_ra_chain __rcu *next;
 65         struct sock             *sk;
 66         union {
 67                 void                    (*destructor)(struct sock *);
 68                 struct sock             *saved_sk;
 69         };
 70         struct rcu_head         rcu;
 71 };
 72 
 73 extern struct ip_ra_chain __rcu *ip_ra_chain;
 74 
 75 /* IP flags. */
 76 #define IP_CE           0x8000          /* Flag: "Congestion"           */
 77 #define IP_DF           0x4000          /* Flag: "Don't Fragment"       */
 78 #define IP_MF           0x2000          /* Flag: "More Fragments"       */
 79 #define IP_OFFSET       0x1FFF          /* "Fragment Offset" part       */
 80 
 81 #define IP_FRAG_TIME    (30 * HZ)               /* fragment lifetime    */
 82 
 83 struct msghdr;
 84 struct net_device;
 85 struct packet_type;
 86 struct rtable;
 87 struct sockaddr;
 88 
 89 extern int              igmp_mc_proc_init(void);
 90 
 91 /*
 92  *      Functions provided by ip.c
 93  */
 94 
 95 extern int              ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
 96                                               __be32 saddr, __be32 daddr,
 97                                               struct ip_options_rcu *opt);
 98 extern int              ip_rcv(struct sk_buff *skb, struct net_device *dev,
 99                                struct packet_type *pt, struct net_device *orig_dev);
100 extern int              ip_local_deliver(struct sk_buff *skb);
101 extern int              ip_mr_input(struct sk_buff *skb);
102 extern int              ip_output(struct sk_buff *skb);
103 extern int              ip_mc_output(struct sk_buff *skb);
104 extern int              ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
105 extern int              ip_do_nat(struct sk_buff *skb);
106 extern void             ip_send_check(struct iphdr *ip);
107 extern int              __ip_local_out(struct sk_buff *skb);
108 extern int              ip_local_out(struct sk_buff *skb);
109 extern int              ip_queue_xmit(struct sk_buff *skb, struct flowi *fl);
110 extern void             ip_init(void);
111 extern int              ip_append_data(struct sock *sk, struct flowi4 *fl4,
112                                        int getfrag(void *from, char *to, int offset, int len,
113                                                    int odd, struct sk_buff *skb),
114                                 void *from, int len, int protolen,
115                                 struct ipcm_cookie *ipc,
116                                 struct rtable **rt,
117                                 unsigned int flags);
118 extern int              ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);
119 extern ssize_t          ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
120                                 int offset, size_t size, int flags);
121 extern struct sk_buff  *__ip_make_skb(struct sock *sk,
122                                       struct flowi4 *fl4,
123                                       struct sk_buff_head *queue,
124                                       struct inet_cork *cork);
125 extern int              ip_send_skb(struct net *net, struct sk_buff *skb);
126 extern int              ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
127 extern void             ip_flush_pending_frames(struct sock *sk);
128 extern struct sk_buff  *ip_make_skb(struct sock *sk,
129                                     struct flowi4 *fl4,
130                                     int getfrag(void *from, char *to, int offset, int len,
131                                                 int odd, struct sk_buff *skb),
132                                     void *from, int length, int transhdrlen,
133                                     struct ipcm_cookie *ipc,
134                                     struct rtable **rtp,
135                                     unsigned int flags);
136 
137 static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
138 {
139         return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
140 }
141 
142 /* datagram.c */
143 extern int              ip4_datagram_connect(struct sock *sk, 
144                                              struct sockaddr *uaddr, int addr_len);
145 
146 extern void ip4_datagram_release_cb(struct sock *sk);
147 
148 struct ip_reply_arg {
149         struct kvec iov[1];   
150         int         flags;
151         __wsum      csum;
152         int         csumoffset; /* u16 offset of csum in iov[0].iov_base */
153                                 /* -1 if not needed */ 
154         int         bound_dev_if;
155         u8          tos;
156 }; 
157 
158 #define IP_REPLY_ARG_NOSRCCHECK 1
159 
160 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
161 {
162         return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
163 }
164 
165 void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr,
166                            __be32 saddr, const struct ip_reply_arg *arg,
167                            unsigned int len);
168 
169 struct ipv4_config {
170         int     log_martians;
171         int     no_pmtu_disc;
172 };
173 
174 extern struct ipv4_config ipv4_config;
175 #define IP_INC_STATS(net, field)        SNMP_INC_STATS64((net)->mib.ip_statistics, field)
176 #define IP_INC_STATS_BH(net, field)     SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field)
177 #define IP_ADD_STATS(net, field, val)   SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
178 #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val)
179 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
180 #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val)
181 #define NET_INC_STATS(net, field)       SNMP_INC_STATS((net)->mib.net_statistics, field)
182 #define NET_INC_STATS_BH(net, field)    SNMP_INC_STATS_BH((net)->mib.net_statistics, field)
183 #define NET_INC_STATS_USER(net, field)  SNMP_INC_STATS_USER((net)->mib.net_statistics, field)
184 #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd)
185 #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd)
186 
187 extern unsigned long snmp_fold_field(void __percpu *mib[], int offt);
188 #if BITS_PER_LONG==32
189 extern u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off);
190 #else
191 static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off)
192 {
193         return snmp_fold_field(mib, offt);
194 }
195 #endif
196 extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align);
197 extern void snmp_mib_free(void __percpu *ptr[2]);
198 
199 extern struct local_ports {
200         seqlock_t       lock;
201         int             range[2];
202 } sysctl_local_ports;
203 extern void inet_get_local_port_range(int *low, int *high);
204 
205 extern unsigned long *sysctl_local_reserved_ports;
206 static inline int inet_is_reserved_local_port(int port)
207 {
208         if (ccs_lport_reserved(port))
209                 return 1;
210         return test_bit(port, sysctl_local_reserved_ports);
211 }
212 
213 extern int sysctl_ip_nonlocal_bind;
214 
215 /* From inetpeer.c */
216 extern int inet_peer_threshold;
217 extern int inet_peer_minttl;
218 extern int inet_peer_maxttl;
219 
220 /* From ip_input.c */
221 extern int sysctl_ip_early_demux;
222 
223 /* From ip_output.c */
224 extern int sysctl_ip_dynaddr;
225 
226 extern void ipfrag_init(void);
227 
228 extern void ip_static_sysctl_init(void);
229 
230 static inline bool ip_is_fragment(const struct iphdr *iph)
231 {
232         return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
233 }
234 
235 #ifdef CONFIG_INET
236 #include <net/dst.h>
237 
238 /* The function in 2.2 was invalid, producing wrong result for
239  * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
240 static inline
241 int ip_decrease_ttl(struct iphdr *iph)
242 {
243         u32 check = (__force u32)iph->check;
244         check += (__force u32)htons(0x0100);
245         iph->check = (__force __sum16)(check + (check>=0xFFFF));
246         return --iph->ttl;
247 }
248 
249 static inline
250 int ip_dont_fragment(struct sock *sk, struct dst_entry *dst)
251 {
252         return  inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO ||
253                 (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT &&
254                  !(dst_metric_locked(dst, RTAX_MTU)));
255 }
256 
257 extern void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more);
258 
259 static inline void ip_select_ident(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk)
260 {
261         struct iphdr *iph = ip_hdr(skb);
262 
263         if ((iph->frag_off & htons(IP_DF)) && !skb->local_df) {
264                 /* This is only to work around buggy Windows95/2000
265                  * VJ compression implementations.  If the ID field
266                  * does not change, they drop every other packet in
267                  * a TCP stream using header compression.
268                  */
269                 iph->id = (sk && inet_sk(sk)->inet_daddr) ?
270                                         htons(inet_sk(sk)->inet_id++) : 0;
271         } else
272                 __ip_select_ident(iph, dst, 0);
273 }
274 
275 static inline void ip_select_ident_more(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk, int more)
276 {
277         struct iphdr *iph = ip_hdr(skb);
278 
279         if ((iph->frag_off & htons(IP_DF)) && !skb->local_df) {
280                 if (sk && inet_sk(sk)->inet_daddr) {
281                         iph->id = htons(inet_sk(sk)->inet_id);
282                         inet_sk(sk)->inet_id += 1 + more;
283                 } else
284                         iph->id = 0;
285         } else
286                 __ip_select_ident(iph, dst, more);
287 }
288 
289 /*
290  *      Map a multicast IP onto multicast MAC for type ethernet.
291  */
292 
293 static inline void ip_eth_mc_map(__be32 naddr, char *buf)
294 {
295         __u32 addr=ntohl(naddr);
296         buf[0]=0x01;
297         buf[1]=0x00;
298         buf[2]=0x5e;
299         buf[5]=addr&0xFF;
300         addr>>=8;
301         buf[4]=addr&0xFF;
302         addr>>=8;
303         buf[3]=addr&0x7F;
304 }
305 
306 /*
307  *      Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
308  *      Leave P_Key as 0 to be filled in by driver.
309  */
310 
311 static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
312 {
313         __u32 addr;
314         unsigned char scope = broadcast[5] & 0xF;
315 
316         buf[0]  = 0;            /* Reserved */
317         buf[1]  = 0xff;         /* Multicast QPN */
318         buf[2]  = 0xff;
319         buf[3]  = 0xff;
320         addr    = ntohl(naddr);
321         buf[4]  = 0xff;
322         buf[5]  = 0x10 | scope; /* scope from broadcast address */
323         buf[6]  = 0x40;         /* IPv4 signature */
324         buf[7]  = 0x1b;
325         buf[8]  = broadcast[8];         /* P_Key */
326         buf[9]  = broadcast[9];
327         buf[10] = 0;
328         buf[11] = 0;
329         buf[12] = 0;
330         buf[13] = 0;
331         buf[14] = 0;
332         buf[15] = 0;
333         buf[19] = addr & 0xff;
334         addr  >>= 8;
335         buf[18] = addr & 0xff;
336         addr  >>= 8;
337         buf[17] = addr & 0xff;
338         addr  >>= 8;
339         buf[16] = addr & 0x0f;
340 }
341 
342 static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
343 {
344         if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
345                 memcpy(buf, broadcast, 4);
346         else
347                 memcpy(buf, &naddr, sizeof(naddr));
348 }
349 
350 #if IS_ENABLED(CONFIG_IPV6)
351 #include <linux/ipv6.h>
352 #endif
353 
354 static __inline__ void inet_reset_saddr(struct sock *sk)
355 {
356         inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
357 #if IS_ENABLED(CONFIG_IPV6)
358         if (sk->sk_family == PF_INET6) {
359                 struct ipv6_pinfo *np = inet6_sk(sk);
360 
361                 memset(&np->saddr, 0, sizeof(np->saddr));
362                 memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr));
363         }
364 #endif
365 }
366 
367 #endif
368 
369 static inline int sk_mc_loop(struct sock *sk)
370 {
371         if (!sk)
372                 return 1;
373         switch (sk->sk_family) {
374         case AF_INET:
375                 return inet_sk(sk)->mc_loop;
376 #if IS_ENABLED(CONFIG_IPV6)
377         case AF_INET6:
378                 return inet6_sk(sk)->mc_loop;
379 #endif
380         }
381         WARN_ON(1);
382         return 1;
383 }
384 
385 extern bool ip_call_ra_chain(struct sk_buff *skb);
386 
387 /*
388  *      Functions provided by ip_fragment.c
389  */
390 
391 enum ip_defrag_users {
392         IP_DEFRAG_LOCAL_DELIVER,
393         IP_DEFRAG_CALL_RA_CHAIN,
394         IP_DEFRAG_CONNTRACK_IN,
395         __IP_DEFRAG_CONNTRACK_IN_END    = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
396         IP_DEFRAG_CONNTRACK_OUT,
397         __IP_DEFRAG_CONNTRACK_OUT_END   = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
398         IP_DEFRAG_CONNTRACK_BRIDGE_IN,
399         __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
400         IP_DEFRAG_VS_IN,
401         IP_DEFRAG_VS_OUT,
402         IP_DEFRAG_VS_FWD,
403         IP_DEFRAG_AF_PACKET,
404         IP_DEFRAG_MACVLAN,
405 };
406 
407 int ip_defrag(struct sk_buff *skb, u32 user);
408 #ifdef CONFIG_INET
409 struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
410 #else
411 static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user)
412 {
413         return skb;
414 }
415 #endif
416 int ip_frag_mem(struct net *net);
417 int ip_frag_nqueues(struct net *net);
418 
419 /*
420  *      Functions provided by ip_forward.c
421  */
422  
423 extern int ip_forward(struct sk_buff *skb);
424  
425 /*
426  *      Functions provided by ip_options.c
427  */
428  
429 extern void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
430                              __be32 daddr, struct rtable *rt, int is_frag);
431 extern int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb);
432 extern void ip_options_fragment(struct sk_buff *skb);
433 extern int ip_options_compile(struct net *net,
434                               struct ip_options *opt, struct sk_buff *skb);
435 extern int ip_options_get(struct net *net, struct ip_options_rcu **optp,
436                           unsigned char *data, int optlen);
437 extern int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp,
438                                     unsigned char __user *data, int optlen);
439 extern void ip_options_undo(struct ip_options * opt);
440 extern void ip_forward_options(struct sk_buff *skb);
441 extern int ip_options_rcv_srr(struct sk_buff *skb);
442 
443 /*
444  *      Functions provided by ip_sockglue.c
445  */
446 
447 extern void     ipv4_pktinfo_prepare(struct sk_buff *skb);
448 extern void     ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb);
449 extern int      ip_cmsg_send(struct net *net,
450                              struct msghdr *msg, struct ipcm_cookie *ipc);
451 extern int      ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, unsigned int optlen);
452 extern int      ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);
453 extern int      compat_ip_setsockopt(struct sock *sk, int level,
454                         int optname, char __user *optval, unsigned int optlen);
455 extern int      compat_ip_getsockopt(struct sock *sk, int level,
456                         int optname, char __user *optval, int __user *optlen);
457 extern int      ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
458 
459 extern int      ip_recv_error(struct sock *sk, struct msghdr *msg, int len);
460 extern void     ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, 
461                               __be16 port, u32 info, u8 *payload);
462 extern void     ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
463                                u32 info);
464 
465 #ifdef CONFIG_PROC_FS
466 extern int ip_misc_proc_init(void);
467 #endif
468 
469 #endif  /* _IP_H */
470 

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