11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * INET An implementation of the TCP/IP protocol suite for the LINUX 31da177e4SLinus Torvalds * operating system. INET is implemented using the BSD Socket 41da177e4SLinus Torvalds * interface as the means of communication with the user level. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Definitions for the IP module. 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Version: @(#)ip.h 1.0.2 05/07/93 91da177e4SLinus Torvalds * 1002c30a84SJesper Juhl * Authors: Ross Biro 111da177e4SLinus Torvalds * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 121da177e4SLinus Torvalds * Alan Cox, <gw4pts@gw4pts.ampr.org> 131da177e4SLinus Torvalds * 141da177e4SLinus Torvalds * Changes: 151da177e4SLinus Torvalds * Mike McLagan : Routing by source 161da177e4SLinus Torvalds * 171da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 181da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 191da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 201da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 211da177e4SLinus Torvalds */ 221da177e4SLinus Torvalds #ifndef _IP_H 231da177e4SLinus Torvalds #define _IP_H 241da177e4SLinus Torvalds 251da177e4SLinus Torvalds #include <linux/types.h> 261da177e4SLinus Torvalds #include <linux/ip.h> 271da177e4SLinus Torvalds #include <linux/in.h> 28c9bdd4b5SArnaldo Carvalho de Melo #include <linux/skbuff.h> 2914c85021SArnaldo Carvalho de Melo 3014c85021SArnaldo Carvalho de Melo #include <net/inet_sock.h> 311da177e4SLinus Torvalds #include <net/snmp.h> 3286b08d86SKOVACS Krisztian #include <net/flow.h> 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds struct sock; 351da177e4SLinus Torvalds 36fd2c3ef7SEric Dumazet struct inet_skb_parm { 371da177e4SLinus Torvalds struct ip_options opt; /* Compiled IP options */ 381da177e4SLinus Torvalds unsigned char flags; 391da177e4SLinus Torvalds 408cdfab8aSPatrick McHardy #define IPSKB_FORWARDED 1 418cdfab8aSPatrick McHardy #define IPSKB_XFRM_TUNNEL_SIZE 2 423e3850e9SPatrick McHardy #define IPSKB_XFRM_TRANSFORMED 4 433e3850e9SPatrick McHardy #define IPSKB_FRAG_COMPLETE 8 4448d5cad8SPatrick McHardy #define IPSKB_REROUTED 16 455f2d04f1SPatrick McHardy 465f2d04f1SPatrick McHardy u16 frag_max_size; 471da177e4SLinus Torvalds }; 481da177e4SLinus Torvalds 49c9bdd4b5SArnaldo Carvalho de Melo static inline unsigned int ip_hdrlen(const struct sk_buff *skb) 50c9bdd4b5SArnaldo Carvalho de Melo { 51eddc9ec5SArnaldo Carvalho de Melo return ip_hdr(skb)->ihl * 4; 52c9bdd4b5SArnaldo Carvalho de Melo } 53c9bdd4b5SArnaldo Carvalho de Melo 54fd2c3ef7SEric Dumazet struct ipcm_cookie { 55c1d18f9fSAl Viro __be32 addr; 561da177e4SLinus Torvalds int oif; 57f6d8bd05SEric Dumazet struct ip_options_rcu *opt; 582244d07bSOliver Hartkopp __u8 tx_flags; 59f02db315SFrancesco Fusco __u8 ttl; 60f02db315SFrancesco Fusco __s16 tos; 61f02db315SFrancesco Fusco char priority; 621da177e4SLinus Torvalds }; 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) 651da177e4SLinus Torvalds 66fd2c3ef7SEric Dumazet struct ip_ra_chain { 6743a951e9SEric Dumazet struct ip_ra_chain __rcu *next; 681da177e4SLinus Torvalds struct sock *sk; 69592fcb9dSEric Dumazet union { 701da177e4SLinus Torvalds void (*destructor)(struct sock *); 71592fcb9dSEric Dumazet struct sock *saved_sk; 72592fcb9dSEric Dumazet }; 7366018506SEric Dumazet struct rcu_head rcu; 741da177e4SLinus Torvalds }; 751da177e4SLinus Torvalds 7643a951e9SEric Dumazet extern struct ip_ra_chain __rcu *ip_ra_chain; 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds /* IP flags. */ 791da177e4SLinus Torvalds #define IP_CE 0x8000 /* Flag: "Congestion" */ 801da177e4SLinus Torvalds #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ 811da177e4SLinus Torvalds #define IP_MF 0x2000 /* Flag: "More Fragments" */ 821da177e4SLinus Torvalds #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ 851da177e4SLinus Torvalds 8614c85021SArnaldo Carvalho de Melo struct msghdr; 8714c85021SArnaldo Carvalho de Melo struct net_device; 8814c85021SArnaldo Carvalho de Melo struct packet_type; 8914c85021SArnaldo Carvalho de Melo struct rtable; 9014c85021SArnaldo Carvalho de Melo struct sockaddr; 9114c85021SArnaldo Carvalho de Melo 925c3a0fd7SJoe Perches int igmp_mc_proc_init(void); 931da177e4SLinus Torvalds 941da177e4SLinus Torvalds /* 951da177e4SLinus Torvalds * Functions provided by ip.c 961da177e4SLinus Torvalds */ 971da177e4SLinus Torvalds 985c3a0fd7SJoe Perches int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, 9913d8eaa0SAl Viro __be32 saddr, __be32 daddr, 100f6d8bd05SEric Dumazet struct ip_options_rcu *opt); 1015c3a0fd7SJoe Perches int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, 1025c3a0fd7SJoe Perches struct net_device *orig_dev); 1035c3a0fd7SJoe Perches int ip_local_deliver(struct sk_buff *skb); 1045c3a0fd7SJoe Perches int ip_mr_input(struct sk_buff *skb); 1055c3a0fd7SJoe Perches int ip_output(struct sk_buff *skb); 1065c3a0fd7SJoe Perches int ip_mc_output(struct sk_buff *skb); 1075c3a0fd7SJoe Perches int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); 1085c3a0fd7SJoe Perches int ip_do_nat(struct sk_buff *skb); 1095c3a0fd7SJoe Perches void ip_send_check(struct iphdr *ip); 1105c3a0fd7SJoe Perches int __ip_local_out(struct sk_buff *skb); 1115c3a0fd7SJoe Perches int ip_local_out(struct sk_buff *skb); 1125c3a0fd7SJoe Perches int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl); 1135c3a0fd7SJoe Perches void ip_init(void); 1145c3a0fd7SJoe Perches int ip_append_data(struct sock *sk, struct flowi4 *fl4, 1151da177e4SLinus Torvalds int getfrag(void *from, char *to, int offset, int len, 1161da177e4SLinus Torvalds int odd, struct sk_buff *skb), 1171da177e4SLinus Torvalds void *from, int len, int protolen, 1181da177e4SLinus Torvalds struct ipcm_cookie *ipc, 1192e77d89bSEric Dumazet struct rtable **rt, 1201da177e4SLinus Torvalds unsigned int flags); 1215c3a0fd7SJoe Perches int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, 1225c3a0fd7SJoe Perches struct sk_buff *skb); 1235c3a0fd7SJoe Perches ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, 1241da177e4SLinus Torvalds int offset, size_t size, int flags); 1255c3a0fd7SJoe Perches struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, 1261c32c5adSHerbert Xu struct sk_buff_head *queue, 1271c32c5adSHerbert Xu struct inet_cork *cork); 1285c3a0fd7SJoe Perches int ip_send_skb(struct net *net, struct sk_buff *skb); 1295c3a0fd7SJoe Perches int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); 1305c3a0fd7SJoe Perches void ip_flush_pending_frames(struct sock *sk); 1315c3a0fd7SJoe Perches struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, 1325c3a0fd7SJoe Perches int getfrag(void *from, char *to, int offset, 1335c3a0fd7SJoe Perches int len, int odd, struct sk_buff *skb), 1341c32c5adSHerbert Xu void *from, int length, int transhdrlen, 1355c3a0fd7SJoe Perches struct ipcm_cookie *ipc, struct rtable **rtp, 1361c32c5adSHerbert Xu unsigned int flags); 1371c32c5adSHerbert Xu 13877968b78SDavid S. Miller static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) 1391c32c5adSHerbert Xu { 14077968b78SDavid S. Miller return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); 1411c32c5adSHerbert Xu } 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds /* datagram.c */ 1445c3a0fd7SJoe Perches int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); 1451da177e4SLinus Torvalds 1465c3a0fd7SJoe Perches void ip4_datagram_release_cb(struct sock *sk); 1478141ed9fSSteffen Klassert 1481da177e4SLinus Torvalds struct ip_reply_arg { 1491da177e4SLinus Torvalds struct kvec iov[1]; 15088ef4a5aSKOVACS Krisztian int flags; 151d6f5493cSAl Viro __wsum csum; 1521da177e4SLinus Torvalds int csumoffset; /* u16 offset of csum in iov[0].iov_base */ 1531da177e4SLinus Torvalds /* -1 if not needed */ 154f0e48dbfSPatrick McHardy int bound_dev_if; 15566b13d99SEric Dumazet u8 tos; 1561da177e4SLinus Torvalds }; 1571da177e4SLinus Torvalds 15888ef4a5aSKOVACS Krisztian #define IP_REPLY_ARG_NOSRCCHECK 1 15988ef4a5aSKOVACS Krisztian 16086b08d86SKOVACS Krisztian static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) 16186b08d86SKOVACS Krisztian { 16286b08d86SKOVACS Krisztian return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; 16386b08d86SKOVACS Krisztian } 16486b08d86SKOVACS Krisztian 165be9f4a44SEric Dumazet void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, 16670e73416SDavid S. Miller __be32 saddr, const struct ip_reply_arg *arg, 16770e73416SDavid S. Miller unsigned int len); 1681da177e4SLinus Torvalds 169fd2c3ef7SEric Dumazet struct ipv4_config { 1701da177e4SLinus Torvalds int log_martians; 1711da177e4SLinus Torvalds int no_pmtu_disc; 1721da177e4SLinus Torvalds }; 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvalds extern struct ipv4_config ipv4_config; 1754ce3c183SEric Dumazet #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) 1764ce3c183SEric Dumazet #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field) 1774ce3c183SEric Dumazet #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) 1784ce3c183SEric Dumazet #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val) 1794ce3c183SEric Dumazet #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) 1804ce3c183SEric Dumazet #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val) 18161a7e260SPavel Emelyanov #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) 18261a7e260SPavel Emelyanov #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) 18361a7e260SPavel Emelyanov #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) 18461a7e260SPavel Emelyanov #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) 18561a7e260SPavel Emelyanov #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) 1861da177e4SLinus Torvalds 1875c3a0fd7SJoe Perches unsigned long snmp_fold_field(void __percpu *mib[], int offt); 1884ce3c183SEric Dumazet #if BITS_PER_LONG==32 1895c3a0fd7SJoe Perches u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off); 1904ce3c183SEric Dumazet #else 1914ce3c183SEric Dumazet static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off) 1924ce3c183SEric Dumazet { 1934ce3c183SEric Dumazet return snmp_fold_field(mib, offt); 1944ce3c183SEric Dumazet } 1954ce3c183SEric Dumazet #endif 1965c3a0fd7SJoe Perches int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align); 1975a17a390SCong Wang 1985a17a390SCong Wang static inline void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ]) 1995a17a390SCong Wang { 2005a17a390SCong Wang int i; 2015a17a390SCong Wang 2025a17a390SCong Wang BUG_ON(ptr == NULL); 2035a17a390SCong Wang for (i = 0; i < SNMP_ARRAY_SZ; i++) { 2045a17a390SCong Wang free_percpu(ptr[i]); 2055a17a390SCong Wang ptr[i] = NULL; 2065a17a390SCong Wang } 2075a17a390SCong Wang } 20833490170SYOSHIFUJI Hideaki 2093c689b73SEric Dumazet extern struct local_ports { 2103c689b73SEric Dumazet seqlock_t lock; 2113c689b73SEric Dumazet int range[2]; 2123c689b73SEric Dumazet } sysctl_local_ports; 2135c3a0fd7SJoe Perches void inet_get_local_port_range(int *low, int *high); 214227b60f5SStephen Hemminger 215e3826f1eSAmerigo Wang extern unsigned long *sysctl_local_reserved_ports; 216e3826f1eSAmerigo Wang static inline int inet_is_reserved_local_port(int port) 217e3826f1eSAmerigo Wang { 218e3826f1eSAmerigo Wang return test_bit(port, sysctl_local_reserved_ports); 219e3826f1eSAmerigo Wang } 220e3826f1eSAmerigo Wang 221cdac4e07SNeil Horman extern int sysctl_ip_nonlocal_bind; 2221da177e4SLinus Torvalds 22320380731SArnaldo Carvalho de Melo /* From inetpeer.c */ 22420380731SArnaldo Carvalho de Melo extern int inet_peer_threshold; 22520380731SArnaldo Carvalho de Melo extern int inet_peer_minttl; 22620380731SArnaldo Carvalho de Melo extern int inet_peer_maxttl; 22720380731SArnaldo Carvalho de Melo 2286648bd7eSAlexander Duyck /* From ip_input.c */ 2296648bd7eSAlexander Duyck extern int sysctl_ip_early_demux; 2306648bd7eSAlexander Duyck 23120380731SArnaldo Carvalho de Melo /* From ip_output.c */ 23220380731SArnaldo Carvalho de Melo extern int sysctl_ip_dynaddr; 23320380731SArnaldo Carvalho de Melo 2345c3a0fd7SJoe Perches void ipfrag_init(void); 23520380731SArnaldo Carvalho de Melo 2365c3a0fd7SJoe Perches void ip_static_sysctl_init(void); 237bd7b1533SAl Viro 238d18cd551SDavid S. Miller static inline bool ip_is_fragment(const struct iphdr *iph) 239d18cd551SDavid S. Miller { 240d18cd551SDavid S. Miller return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; 241d18cd551SDavid S. Miller } 242d18cd551SDavid S. Miller 2431da177e4SLinus Torvalds #ifdef CONFIG_INET 24414c85021SArnaldo Carvalho de Melo #include <net/dst.h> 24514c85021SArnaldo Carvalho de Melo 2461da177e4SLinus Torvalds /* The function in 2.2 was invalid, producing wrong result for 2471da177e4SLinus Torvalds * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ 2481da177e4SLinus Torvalds static inline 2491da177e4SLinus Torvalds int ip_decrease_ttl(struct iphdr *iph) 2501da177e4SLinus Torvalds { 2515c78f275SAl Viro u32 check = (__force u32)iph->check; 2525c78f275SAl Viro check += (__force u32)htons(0x0100); 2535c78f275SAl Viro iph->check = (__force __sum16)(check + (check>=0xFFFF)); 2541da177e4SLinus Torvalds return --iph->ttl; 2551da177e4SLinus Torvalds } 2561da177e4SLinus Torvalds 2571da177e4SLinus Torvalds static inline 2581da177e4SLinus Torvalds int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) 2591da177e4SLinus Torvalds { 260a02cec21SEric Dumazet return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || 2611da177e4SLinus Torvalds (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && 262a02cec21SEric Dumazet !(dst_metric_locked(dst, RTAX_MTU))); 2631da177e4SLinus Torvalds } 2641da177e4SLinus Torvalds 2655c3a0fd7SJoe Perches void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); 2661da177e4SLinus Torvalds 267703133deSAnsis Atteka static inline void ip_select_ident(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk) 2681da177e4SLinus Torvalds { 269703133deSAnsis Atteka struct iphdr *iph = ip_hdr(skb); 270703133deSAnsis Atteka 271703133deSAnsis Atteka if ((iph->frag_off & htons(IP_DF)) && !skb->local_df) { 2721da177e4SLinus Torvalds /* This is only to work around buggy Windows95/2000 2731da177e4SLinus Torvalds * VJ compression implementations. If the ID field 2741da177e4SLinus Torvalds * does not change, they drop every other packet in 2751da177e4SLinus Torvalds * a TCP stream using header compression. 2761da177e4SLinus Torvalds */ 277c720c7e8SEric Dumazet iph->id = (sk && inet_sk(sk)->inet_daddr) ? 278c720c7e8SEric Dumazet htons(inet_sk(sk)->inet_id++) : 0; 2791da177e4SLinus Torvalds } else 2801da177e4SLinus Torvalds __ip_select_ident(iph, dst, 0); 2811da177e4SLinus Torvalds } 2821da177e4SLinus Torvalds 283703133deSAnsis Atteka static inline void ip_select_ident_more(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk, int more) 2841da177e4SLinus Torvalds { 285703133deSAnsis Atteka struct iphdr *iph = ip_hdr(skb); 286703133deSAnsis Atteka 287703133deSAnsis Atteka if ((iph->frag_off & htons(IP_DF)) && !skb->local_df) { 288c720c7e8SEric Dumazet if (sk && inet_sk(sk)->inet_daddr) { 289c720c7e8SEric Dumazet iph->id = htons(inet_sk(sk)->inet_id); 290c720c7e8SEric Dumazet inet_sk(sk)->inet_id += 1 + more; 2911da177e4SLinus Torvalds } else 2921da177e4SLinus Torvalds iph->id = 0; 2931da177e4SLinus Torvalds } else 2941da177e4SLinus Torvalds __ip_select_ident(iph, dst, more); 2951da177e4SLinus Torvalds } 2961da177e4SLinus Torvalds 2971da177e4SLinus Torvalds /* 2981da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type ethernet. 2991da177e4SLinus Torvalds */ 3001da177e4SLinus Torvalds 301714e85beSAl Viro static inline void ip_eth_mc_map(__be32 naddr, char *buf) 3021da177e4SLinus Torvalds { 303714e85beSAl Viro __u32 addr=ntohl(naddr); 3041da177e4SLinus Torvalds buf[0]=0x01; 3051da177e4SLinus Torvalds buf[1]=0x00; 3061da177e4SLinus Torvalds buf[2]=0x5e; 3071da177e4SLinus Torvalds buf[5]=addr&0xFF; 3081da177e4SLinus Torvalds addr>>=8; 3091da177e4SLinus Torvalds buf[4]=addr&0xFF; 3101da177e4SLinus Torvalds addr>>=8; 3111da177e4SLinus Torvalds buf[3]=addr&0x7F; 3121da177e4SLinus Torvalds } 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvalds /* 3151da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. 3161da177e4SLinus Torvalds * Leave P_Key as 0 to be filled in by driver. 3171da177e4SLinus Torvalds */ 3181da177e4SLinus Torvalds 319a9e527e3SRolf Manderscheid static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 3201da177e4SLinus Torvalds { 321714e85beSAl Viro __u32 addr; 322a9e527e3SRolf Manderscheid unsigned char scope = broadcast[5] & 0xF; 323a9e527e3SRolf Manderscheid 3241da177e4SLinus Torvalds buf[0] = 0; /* Reserved */ 3251da177e4SLinus Torvalds buf[1] = 0xff; /* Multicast QPN */ 3261da177e4SLinus Torvalds buf[2] = 0xff; 3271da177e4SLinus Torvalds buf[3] = 0xff; 328714e85beSAl Viro addr = ntohl(naddr); 3291da177e4SLinus Torvalds buf[4] = 0xff; 330a9e527e3SRolf Manderscheid buf[5] = 0x10 | scope; /* scope from broadcast address */ 3311da177e4SLinus Torvalds buf[6] = 0x40; /* IPv4 signature */ 3321da177e4SLinus Torvalds buf[7] = 0x1b; 333a9e527e3SRolf Manderscheid buf[8] = broadcast[8]; /* P_Key */ 334a9e527e3SRolf Manderscheid buf[9] = broadcast[9]; 3351da177e4SLinus Torvalds buf[10] = 0; 3361da177e4SLinus Torvalds buf[11] = 0; 3371da177e4SLinus Torvalds buf[12] = 0; 3381da177e4SLinus Torvalds buf[13] = 0; 3391da177e4SLinus Torvalds buf[14] = 0; 3401da177e4SLinus Torvalds buf[15] = 0; 3411da177e4SLinus Torvalds buf[19] = addr & 0xff; 3421da177e4SLinus Torvalds addr >>= 8; 3431da177e4SLinus Torvalds buf[18] = addr & 0xff; 3441da177e4SLinus Torvalds addr >>= 8; 3451da177e4SLinus Torvalds buf[17] = addr & 0xff; 3461da177e4SLinus Torvalds addr >>= 8; 3471da177e4SLinus Torvalds buf[16] = addr & 0x0f; 3481da177e4SLinus Torvalds } 3491da177e4SLinus Torvalds 35093ca3bb5STimo Teräs static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 35193ca3bb5STimo Teräs { 35293ca3bb5STimo Teräs if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) 35393ca3bb5STimo Teräs memcpy(buf, broadcast, 4); 35493ca3bb5STimo Teräs else 35593ca3bb5STimo Teräs memcpy(buf, &naddr, sizeof(naddr)); 35693ca3bb5STimo Teräs } 35793ca3bb5STimo Teräs 358dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 3591da177e4SLinus Torvalds #include <linux/ipv6.h> 3601da177e4SLinus Torvalds #endif 3611da177e4SLinus Torvalds 3621da177e4SLinus Torvalds static __inline__ void inet_reset_saddr(struct sock *sk) 3631da177e4SLinus Torvalds { 364c720c7e8SEric Dumazet inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; 365dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 3661da177e4SLinus Torvalds if (sk->sk_family == PF_INET6) { 3671da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds memset(&np->saddr, 0, sizeof(np->saddr)); 3701da177e4SLinus Torvalds memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds #endif 3731da177e4SLinus Torvalds } 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvalds #endif 3761da177e4SLinus Torvalds 3777ad6848cSOctavian Purdila static inline int sk_mc_loop(struct sock *sk) 3787ad6848cSOctavian Purdila { 3797ad6848cSOctavian Purdila if (!sk) 3807ad6848cSOctavian Purdila return 1; 3817ad6848cSOctavian Purdila switch (sk->sk_family) { 3827ad6848cSOctavian Purdila case AF_INET: 3837ad6848cSOctavian Purdila return inet_sk(sk)->mc_loop; 384dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 3857ad6848cSOctavian Purdila case AF_INET6: 3867ad6848cSOctavian Purdila return inet6_sk(sk)->mc_loop; 3877ad6848cSOctavian Purdila #endif 3887ad6848cSOctavian Purdila } 389cd65c3c7SOctavian Purdila WARN_ON(1); 3907ad6848cSOctavian Purdila return 1; 3917ad6848cSOctavian Purdila } 3927ad6848cSOctavian Purdila 3935c3a0fd7SJoe Perches bool ip_call_ra_chain(struct sk_buff *skb); 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvalds /* 396b798232fSRami Rosen * Functions provided by ip_fragment.c 3971da177e4SLinus Torvalds */ 3981da177e4SLinus Torvalds 399fd2c3ef7SEric Dumazet enum ip_defrag_users { 4001da177e4SLinus Torvalds IP_DEFRAG_LOCAL_DELIVER, 4011da177e4SLinus Torvalds IP_DEFRAG_CALL_RA_CHAIN, 4021da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_IN, 4034be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, 4041da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_OUT, 4054be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 4068fa9ff68SPatrick McHardy IP_DEFRAG_CONNTRACK_BRIDGE_IN, 4074be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 4081da177e4SLinus Torvalds IP_DEFRAG_VS_IN, 4091da177e4SLinus Torvalds IP_DEFRAG_VS_OUT, 410595fc71bSDavid S. Miller IP_DEFRAG_VS_FWD, 411595fc71bSDavid S. Miller IP_DEFRAG_AF_PACKET, 412bc416d97SEric Dumazet IP_DEFRAG_MACVLAN, 4131da177e4SLinus Torvalds }; 4141da177e4SLinus Torvalds 415776c729eSHerbert Xu int ip_defrag(struct sk_buff *skb, u32 user); 416bc416d97SEric Dumazet #ifdef CONFIG_INET 417bc416d97SEric Dumazet struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user); 418bc416d97SEric Dumazet #else 419bc416d97SEric Dumazet static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user) 420bc416d97SEric Dumazet { 421bc416d97SEric Dumazet return skb; 422bc416d97SEric Dumazet } 423bc416d97SEric Dumazet #endif 4246ddc0822SPavel Emelyanov int ip_frag_mem(struct net *net); 425e5a2bb84SPavel Emelyanov int ip_frag_nqueues(struct net *net); 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds /* 4281da177e4SLinus Torvalds * Functions provided by ip_forward.c 4291da177e4SLinus Torvalds */ 4301da177e4SLinus Torvalds 4315c3a0fd7SJoe Perches int ip_forward(struct sk_buff *skb); 4321da177e4SLinus Torvalds 4331da177e4SLinus Torvalds /* 4341da177e4SLinus Torvalds * Functions provided by ip_options.c 4351da177e4SLinus Torvalds */ 4361da177e4SLinus Torvalds 4375c3a0fd7SJoe Perches void ip_options_build(struct sk_buff *skb, struct ip_options *opt, 438f6d8bd05SEric Dumazet __be32 daddr, struct rtable *rt, int is_frag); 4395c3a0fd7SJoe Perches int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); 4405c3a0fd7SJoe Perches void ip_options_fragment(struct sk_buff *skb); 4415c3a0fd7SJoe Perches int ip_options_compile(struct net *net, struct ip_options *opt, 4425c3a0fd7SJoe Perches struct sk_buff *skb); 4435c3a0fd7SJoe Perches int ip_options_get(struct net *net, struct ip_options_rcu **optp, 4444c6ea29dSArnaldo Carvalho de Melo unsigned char *data, int optlen); 4455c3a0fd7SJoe Perches int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, 4464c6ea29dSArnaldo Carvalho de Melo unsigned char __user *data, int optlen); 4475c3a0fd7SJoe Perches void ip_options_undo(struct ip_options *opt); 4485c3a0fd7SJoe Perches void ip_forward_options(struct sk_buff *skb); 4495c3a0fd7SJoe Perches int ip_options_rcv_srr(struct sk_buff *skb); 4501da177e4SLinus Torvalds 4511da177e4SLinus Torvalds /* 4521da177e4SLinus Torvalds * Functions provided by ip_sockglue.c 4531da177e4SLinus Torvalds */ 4541da177e4SLinus Torvalds 4555c3a0fd7SJoe Perches void ipv4_pktinfo_prepare(struct sk_buff *skb); 4565c3a0fd7SJoe Perches void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); 4575c3a0fd7SJoe Perches int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc); 4585c3a0fd7SJoe Perches int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, 4595c3a0fd7SJoe Perches unsigned int optlen); 4605c3a0fd7SJoe Perches int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, 4615c3a0fd7SJoe Perches int __user *optlen); 4625c3a0fd7SJoe Perches int compat_ip_setsockopt(struct sock *sk, int level, int optname, 4635c3a0fd7SJoe Perches char __user *optval, unsigned int optlen); 4645c3a0fd7SJoe Perches int compat_ip_getsockopt(struct sock *sk, int level, int optname, 4655c3a0fd7SJoe Perches char __user *optval, int __user *optlen); 4665c3a0fd7SJoe Perches int ip_ra_control(struct sock *sk, unsigned char on, 4675c3a0fd7SJoe Perches void (*destructor)(struct sock *)); 4681da177e4SLinus Torvalds 4695c3a0fd7SJoe Perches int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); 4705c3a0fd7SJoe Perches void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 4715c3a0fd7SJoe Perches u32 info, u8 *payload); 4725c3a0fd7SJoe Perches void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, 4731da177e4SLinus Torvalds u32 info); 4741da177e4SLinus Torvalds 47520380731SArnaldo Carvalho de Melo #ifdef CONFIG_PROC_FS 4765c3a0fd7SJoe Perches int ip_misc_proc_init(void); 47720380731SArnaldo Carvalho de Melo #endif 47820380731SArnaldo Carvalho de Melo 4791da177e4SLinus Torvalds #endif /* _IP_H */ 480