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> 31aa661581SFrancesco Fusco #include <net/route.h> 321da177e4SLinus Torvalds #include <net/snmp.h> 3386b08d86SKOVACS Krisztian #include <net/flow.h> 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds struct sock; 361da177e4SLinus Torvalds 37fd2c3ef7SEric Dumazet struct inet_skb_parm { 381da177e4SLinus Torvalds struct ip_options opt; /* Compiled IP options */ 391da177e4SLinus Torvalds unsigned char flags; 401da177e4SLinus Torvalds 418cdfab8aSPatrick McHardy #define IPSKB_FORWARDED 1 428cdfab8aSPatrick McHardy #define IPSKB_XFRM_TUNNEL_SIZE 2 433e3850e9SPatrick McHardy #define IPSKB_XFRM_TRANSFORMED 4 443e3850e9SPatrick McHardy #define IPSKB_FRAG_COMPLETE 8 4548d5cad8SPatrick McHardy #define IPSKB_REROUTED 16 465f2d04f1SPatrick McHardy 475f2d04f1SPatrick McHardy u16 frag_max_size; 481da177e4SLinus Torvalds }; 491da177e4SLinus Torvalds 50c9bdd4b5SArnaldo Carvalho de Melo static inline unsigned int ip_hdrlen(const struct sk_buff *skb) 51c9bdd4b5SArnaldo Carvalho de Melo { 52eddc9ec5SArnaldo Carvalho de Melo return ip_hdr(skb)->ihl * 4; 53c9bdd4b5SArnaldo Carvalho de Melo } 54c9bdd4b5SArnaldo Carvalho de Melo 55fd2c3ef7SEric Dumazet struct ipcm_cookie { 56c1d18f9fSAl Viro __be32 addr; 571da177e4SLinus Torvalds int oif; 58f6d8bd05SEric Dumazet struct ip_options_rcu *opt; 592244d07bSOliver Hartkopp __u8 tx_flags; 60f02db315SFrancesco Fusco __u8 ttl; 61f02db315SFrancesco Fusco __s16 tos; 62f02db315SFrancesco Fusco char priority; 631da177e4SLinus Torvalds }; 641da177e4SLinus Torvalds 651da177e4SLinus Torvalds #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) 661da177e4SLinus Torvalds 67fd2c3ef7SEric Dumazet struct ip_ra_chain { 6843a951e9SEric Dumazet struct ip_ra_chain __rcu *next; 691da177e4SLinus Torvalds struct sock *sk; 70592fcb9dSEric Dumazet union { 711da177e4SLinus Torvalds void (*destructor)(struct sock *); 72592fcb9dSEric Dumazet struct sock *saved_sk; 73592fcb9dSEric Dumazet }; 7466018506SEric Dumazet struct rcu_head rcu; 751da177e4SLinus Torvalds }; 761da177e4SLinus Torvalds 7743a951e9SEric Dumazet extern struct ip_ra_chain __rcu *ip_ra_chain; 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds /* IP flags. */ 801da177e4SLinus Torvalds #define IP_CE 0x8000 /* Flag: "Congestion" */ 811da177e4SLinus Torvalds #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ 821da177e4SLinus Torvalds #define IP_MF 0x2000 /* Flag: "More Fragments" */ 831da177e4SLinus Torvalds #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ 841da177e4SLinus Torvalds 851da177e4SLinus Torvalds #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ 861da177e4SLinus Torvalds 8714c85021SArnaldo Carvalho de Melo struct msghdr; 8814c85021SArnaldo Carvalho de Melo struct net_device; 8914c85021SArnaldo Carvalho de Melo struct packet_type; 9014c85021SArnaldo Carvalho de Melo struct rtable; 9114c85021SArnaldo Carvalho de Melo struct sockaddr; 9214c85021SArnaldo Carvalho de Melo 935c3a0fd7SJoe Perches int igmp_mc_proc_init(void); 941da177e4SLinus Torvalds 951da177e4SLinus Torvalds /* 961da177e4SLinus Torvalds * Functions provided by ip.c 971da177e4SLinus Torvalds */ 981da177e4SLinus Torvalds 995c3a0fd7SJoe Perches int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk, 10013d8eaa0SAl Viro __be32 saddr, __be32 daddr, 101f6d8bd05SEric Dumazet struct ip_options_rcu *opt); 1025c3a0fd7SJoe Perches int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, 1035c3a0fd7SJoe Perches struct net_device *orig_dev); 1045c3a0fd7SJoe Perches int ip_local_deliver(struct sk_buff *skb); 1055c3a0fd7SJoe Perches int ip_mr_input(struct sk_buff *skb); 1065c3a0fd7SJoe Perches int ip_output(struct sk_buff *skb); 1075c3a0fd7SJoe Perches int ip_mc_output(struct sk_buff *skb); 1085c3a0fd7SJoe Perches int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); 1095c3a0fd7SJoe Perches int ip_do_nat(struct sk_buff *skb); 1105c3a0fd7SJoe Perches void ip_send_check(struct iphdr *ip); 1115c3a0fd7SJoe Perches int __ip_local_out(struct sk_buff *skb); 1125c3a0fd7SJoe Perches int ip_local_out(struct sk_buff *skb); 1135c3a0fd7SJoe Perches int ip_queue_xmit(struct sk_buff *skb, struct flowi *fl); 1145c3a0fd7SJoe Perches void ip_init(void); 1155c3a0fd7SJoe Perches int ip_append_data(struct sock *sk, struct flowi4 *fl4, 1161da177e4SLinus Torvalds int getfrag(void *from, char *to, int offset, int len, 1171da177e4SLinus Torvalds int odd, struct sk_buff *skb), 1181da177e4SLinus Torvalds void *from, int len, int protolen, 1191da177e4SLinus Torvalds struct ipcm_cookie *ipc, 1202e77d89bSEric Dumazet struct rtable **rt, 1211da177e4SLinus Torvalds unsigned int flags); 1225c3a0fd7SJoe Perches int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, 1235c3a0fd7SJoe Perches struct sk_buff *skb); 1245c3a0fd7SJoe Perches ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, 1251da177e4SLinus Torvalds int offset, size_t size, int flags); 1265c3a0fd7SJoe Perches struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, 1271c32c5adSHerbert Xu struct sk_buff_head *queue, 1281c32c5adSHerbert Xu struct inet_cork *cork); 1295c3a0fd7SJoe Perches int ip_send_skb(struct net *net, struct sk_buff *skb); 1305c3a0fd7SJoe Perches int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); 1315c3a0fd7SJoe Perches void ip_flush_pending_frames(struct sock *sk); 1325c3a0fd7SJoe Perches struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, 1335c3a0fd7SJoe Perches int getfrag(void *from, char *to, int offset, 1345c3a0fd7SJoe Perches int len, int odd, struct sk_buff *skb), 1351c32c5adSHerbert Xu void *from, int length, int transhdrlen, 1365c3a0fd7SJoe Perches struct ipcm_cookie *ipc, struct rtable **rtp, 1371c32c5adSHerbert Xu unsigned int flags); 1381c32c5adSHerbert Xu 13977968b78SDavid S. Miller static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) 1401c32c5adSHerbert Xu { 14177968b78SDavid S. Miller return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); 1421c32c5adSHerbert Xu } 1431da177e4SLinus Torvalds 144aa661581SFrancesco Fusco static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) 145aa661581SFrancesco Fusco { 146aa661581SFrancesco Fusco return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); 147aa661581SFrancesco Fusco } 148aa661581SFrancesco Fusco 149aa661581SFrancesco Fusco static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) 150aa661581SFrancesco Fusco { 151aa661581SFrancesco Fusco return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); 152aa661581SFrancesco Fusco } 153aa661581SFrancesco Fusco 1541da177e4SLinus Torvalds /* datagram.c */ 1555c3a0fd7SJoe Perches int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); 1561da177e4SLinus Torvalds 1575c3a0fd7SJoe Perches void ip4_datagram_release_cb(struct sock *sk); 1588141ed9fSSteffen Klassert 1591da177e4SLinus Torvalds struct ip_reply_arg { 1601da177e4SLinus Torvalds struct kvec iov[1]; 16188ef4a5aSKOVACS Krisztian int flags; 162d6f5493cSAl Viro __wsum csum; 1631da177e4SLinus Torvalds int csumoffset; /* u16 offset of csum in iov[0].iov_base */ 1641da177e4SLinus Torvalds /* -1 if not needed */ 165f0e48dbfSPatrick McHardy int bound_dev_if; 16666b13d99SEric Dumazet u8 tos; 1671da177e4SLinus Torvalds }; 1681da177e4SLinus Torvalds 16988ef4a5aSKOVACS Krisztian #define IP_REPLY_ARG_NOSRCCHECK 1 17088ef4a5aSKOVACS Krisztian 17186b08d86SKOVACS Krisztian static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) 17286b08d86SKOVACS Krisztian { 17386b08d86SKOVACS Krisztian return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; 17486b08d86SKOVACS Krisztian } 17586b08d86SKOVACS Krisztian 176be9f4a44SEric Dumazet void ip_send_unicast_reply(struct net *net, struct sk_buff *skb, __be32 daddr, 17770e73416SDavid S. Miller __be32 saddr, const struct ip_reply_arg *arg, 17870e73416SDavid S. Miller unsigned int len); 1791da177e4SLinus Torvalds 180fd2c3ef7SEric Dumazet struct ipv4_config { 1811da177e4SLinus Torvalds int log_martians; 1821da177e4SLinus Torvalds int no_pmtu_disc; 1831da177e4SLinus Torvalds }; 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvalds extern struct ipv4_config ipv4_config; 1864ce3c183SEric Dumazet #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) 1874ce3c183SEric Dumazet #define IP_INC_STATS_BH(net, field) SNMP_INC_STATS64_BH((net)->mib.ip_statistics, field) 1884ce3c183SEric Dumazet #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) 1894ce3c183SEric Dumazet #define IP_ADD_STATS_BH(net, field, val) SNMP_ADD_STATS64_BH((net)->mib.ip_statistics, field, val) 1904ce3c183SEric Dumazet #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) 1914ce3c183SEric Dumazet #define IP_UPD_PO_STATS_BH(net, field, val) SNMP_UPD_PO_STATS64_BH((net)->mib.ip_statistics, field, val) 19261a7e260SPavel Emelyanov #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) 19361a7e260SPavel Emelyanov #define NET_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.net_statistics, field) 19461a7e260SPavel Emelyanov #define NET_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)->mib.net_statistics, field) 19561a7e260SPavel Emelyanov #define NET_ADD_STATS_BH(net, field, adnd) SNMP_ADD_STATS_BH((net)->mib.net_statistics, field, adnd) 19661a7e260SPavel Emelyanov #define NET_ADD_STATS_USER(net, field, adnd) SNMP_ADD_STATS_USER((net)->mib.net_statistics, field, adnd) 1971da177e4SLinus Torvalds 1985c3a0fd7SJoe Perches unsigned long snmp_fold_field(void __percpu *mib[], int offt); 1994ce3c183SEric Dumazet #if BITS_PER_LONG==32 2005c3a0fd7SJoe Perches u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t sync_off); 2014ce3c183SEric Dumazet #else 2024ce3c183SEric Dumazet static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_off) 2034ce3c183SEric Dumazet { 2044ce3c183SEric Dumazet return snmp_fold_field(mib, offt); 2054ce3c183SEric Dumazet } 2064ce3c183SEric Dumazet #endif 2075c3a0fd7SJoe Perches int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align); 2085a17a390SCong Wang 2095a17a390SCong Wang static inline void snmp_mib_free(void __percpu *ptr[SNMP_ARRAY_SZ]) 2105a17a390SCong Wang { 2115a17a390SCong Wang int i; 2125a17a390SCong Wang 2135a17a390SCong Wang BUG_ON(ptr == NULL); 2145a17a390SCong Wang for (i = 0; i < SNMP_ARRAY_SZ; i++) { 2155a17a390SCong Wang free_percpu(ptr[i]); 2165a17a390SCong Wang ptr[i] = NULL; 2175a17a390SCong Wang } 2185a17a390SCong Wang } 21933490170SYOSHIFUJI Hideaki 220*0bbf87d8SEric W. Biederman void inet_get_local_port_range(struct net *net, int *low, int *high); 221227b60f5SStephen Hemminger 222e3826f1eSAmerigo Wang extern unsigned long *sysctl_local_reserved_ports; 223e3826f1eSAmerigo Wang static inline int inet_is_reserved_local_port(int port) 224e3826f1eSAmerigo Wang { 225e3826f1eSAmerigo Wang return test_bit(port, sysctl_local_reserved_ports); 226e3826f1eSAmerigo Wang } 227e3826f1eSAmerigo Wang 228cdac4e07SNeil Horman extern int sysctl_ip_nonlocal_bind; 2291da177e4SLinus Torvalds 23020380731SArnaldo Carvalho de Melo /* From inetpeer.c */ 23120380731SArnaldo Carvalho de Melo extern int inet_peer_threshold; 23220380731SArnaldo Carvalho de Melo extern int inet_peer_minttl; 23320380731SArnaldo Carvalho de Melo extern int inet_peer_maxttl; 23420380731SArnaldo Carvalho de Melo 2356648bd7eSAlexander Duyck /* From ip_input.c */ 2366648bd7eSAlexander Duyck extern int sysctl_ip_early_demux; 2376648bd7eSAlexander Duyck 23820380731SArnaldo Carvalho de Melo /* From ip_output.c */ 23920380731SArnaldo Carvalho de Melo extern int sysctl_ip_dynaddr; 24020380731SArnaldo Carvalho de Melo 2415c3a0fd7SJoe Perches void ipfrag_init(void); 24220380731SArnaldo Carvalho de Melo 2435c3a0fd7SJoe Perches void ip_static_sysctl_init(void); 244bd7b1533SAl Viro 245d18cd551SDavid S. Miller static inline bool ip_is_fragment(const struct iphdr *iph) 246d18cd551SDavid S. Miller { 247d18cd551SDavid S. Miller return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; 248d18cd551SDavid S. Miller } 249d18cd551SDavid S. Miller 2501da177e4SLinus Torvalds #ifdef CONFIG_INET 25114c85021SArnaldo Carvalho de Melo #include <net/dst.h> 25214c85021SArnaldo Carvalho de Melo 2531da177e4SLinus Torvalds /* The function in 2.2 was invalid, producing wrong result for 2541da177e4SLinus Torvalds * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ 2551da177e4SLinus Torvalds static inline 2561da177e4SLinus Torvalds int ip_decrease_ttl(struct iphdr *iph) 2571da177e4SLinus Torvalds { 2585c78f275SAl Viro u32 check = (__force u32)iph->check; 2595c78f275SAl Viro check += (__force u32)htons(0x0100); 2605c78f275SAl Viro iph->check = (__force __sum16)(check + (check>=0xFFFF)); 2611da177e4SLinus Torvalds return --iph->ttl; 2621da177e4SLinus Torvalds } 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvalds static inline 2651da177e4SLinus Torvalds int ip_dont_fragment(struct sock *sk, struct dst_entry *dst) 2661da177e4SLinus Torvalds { 267a02cec21SEric Dumazet return inet_sk(sk)->pmtudisc == IP_PMTUDISC_DO || 2681da177e4SLinus Torvalds (inet_sk(sk)->pmtudisc == IP_PMTUDISC_WANT && 269a02cec21SEric Dumazet !(dst_metric_locked(dst, RTAX_MTU))); 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 2725c3a0fd7SJoe Perches void __ip_select_ident(struct iphdr *iph, struct dst_entry *dst, int more); 2731da177e4SLinus Torvalds 274703133deSAnsis Atteka static inline void ip_select_ident(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk) 2751da177e4SLinus Torvalds { 276703133deSAnsis Atteka struct iphdr *iph = ip_hdr(skb); 277703133deSAnsis Atteka 278703133deSAnsis Atteka if ((iph->frag_off & htons(IP_DF)) && !skb->local_df) { 2791da177e4SLinus Torvalds /* This is only to work around buggy Windows95/2000 2801da177e4SLinus Torvalds * VJ compression implementations. If the ID field 2811da177e4SLinus Torvalds * does not change, they drop every other packet in 2821da177e4SLinus Torvalds * a TCP stream using header compression. 2831da177e4SLinus Torvalds */ 284c720c7e8SEric Dumazet iph->id = (sk && inet_sk(sk)->inet_daddr) ? 285c720c7e8SEric Dumazet htons(inet_sk(sk)->inet_id++) : 0; 2861da177e4SLinus Torvalds } else 2871da177e4SLinus Torvalds __ip_select_ident(iph, dst, 0); 2881da177e4SLinus Torvalds } 2891da177e4SLinus Torvalds 290703133deSAnsis Atteka static inline void ip_select_ident_more(struct sk_buff *skb, struct dst_entry *dst, struct sock *sk, int more) 2911da177e4SLinus Torvalds { 292703133deSAnsis Atteka struct iphdr *iph = ip_hdr(skb); 293703133deSAnsis Atteka 294703133deSAnsis Atteka if ((iph->frag_off & htons(IP_DF)) && !skb->local_df) { 295c720c7e8SEric Dumazet if (sk && inet_sk(sk)->inet_daddr) { 296c720c7e8SEric Dumazet iph->id = htons(inet_sk(sk)->inet_id); 297c720c7e8SEric Dumazet inet_sk(sk)->inet_id += 1 + more; 2981da177e4SLinus Torvalds } else 2991da177e4SLinus Torvalds iph->id = 0; 3001da177e4SLinus Torvalds } else 3011da177e4SLinus Torvalds __ip_select_ident(iph, dst, more); 3021da177e4SLinus Torvalds } 3031da177e4SLinus Torvalds 3041da177e4SLinus Torvalds /* 3051da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type ethernet. 3061da177e4SLinus Torvalds */ 3071da177e4SLinus Torvalds 308714e85beSAl Viro static inline void ip_eth_mc_map(__be32 naddr, char *buf) 3091da177e4SLinus Torvalds { 310714e85beSAl Viro __u32 addr=ntohl(naddr); 3111da177e4SLinus Torvalds buf[0]=0x01; 3121da177e4SLinus Torvalds buf[1]=0x00; 3131da177e4SLinus Torvalds buf[2]=0x5e; 3141da177e4SLinus Torvalds buf[5]=addr&0xFF; 3151da177e4SLinus Torvalds addr>>=8; 3161da177e4SLinus Torvalds buf[4]=addr&0xFF; 3171da177e4SLinus Torvalds addr>>=8; 3181da177e4SLinus Torvalds buf[3]=addr&0x7F; 3191da177e4SLinus Torvalds } 3201da177e4SLinus Torvalds 3211da177e4SLinus Torvalds /* 3221da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. 3231da177e4SLinus Torvalds * Leave P_Key as 0 to be filled in by driver. 3241da177e4SLinus Torvalds */ 3251da177e4SLinus Torvalds 326a9e527e3SRolf Manderscheid static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 3271da177e4SLinus Torvalds { 328714e85beSAl Viro __u32 addr; 329a9e527e3SRolf Manderscheid unsigned char scope = broadcast[5] & 0xF; 330a9e527e3SRolf Manderscheid 3311da177e4SLinus Torvalds buf[0] = 0; /* Reserved */ 3321da177e4SLinus Torvalds buf[1] = 0xff; /* Multicast QPN */ 3331da177e4SLinus Torvalds buf[2] = 0xff; 3341da177e4SLinus Torvalds buf[3] = 0xff; 335714e85beSAl Viro addr = ntohl(naddr); 3361da177e4SLinus Torvalds buf[4] = 0xff; 337a9e527e3SRolf Manderscheid buf[5] = 0x10 | scope; /* scope from broadcast address */ 3381da177e4SLinus Torvalds buf[6] = 0x40; /* IPv4 signature */ 3391da177e4SLinus Torvalds buf[7] = 0x1b; 340a9e527e3SRolf Manderscheid buf[8] = broadcast[8]; /* P_Key */ 341a9e527e3SRolf Manderscheid buf[9] = broadcast[9]; 3421da177e4SLinus Torvalds buf[10] = 0; 3431da177e4SLinus Torvalds buf[11] = 0; 3441da177e4SLinus Torvalds buf[12] = 0; 3451da177e4SLinus Torvalds buf[13] = 0; 3461da177e4SLinus Torvalds buf[14] = 0; 3471da177e4SLinus Torvalds buf[15] = 0; 3481da177e4SLinus Torvalds buf[19] = addr & 0xff; 3491da177e4SLinus Torvalds addr >>= 8; 3501da177e4SLinus Torvalds buf[18] = addr & 0xff; 3511da177e4SLinus Torvalds addr >>= 8; 3521da177e4SLinus Torvalds buf[17] = addr & 0xff; 3531da177e4SLinus Torvalds addr >>= 8; 3541da177e4SLinus Torvalds buf[16] = addr & 0x0f; 3551da177e4SLinus Torvalds } 3561da177e4SLinus Torvalds 35793ca3bb5STimo Teräs static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 35893ca3bb5STimo Teräs { 35993ca3bb5STimo Teräs if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) 36093ca3bb5STimo Teräs memcpy(buf, broadcast, 4); 36193ca3bb5STimo Teräs else 36293ca3bb5STimo Teräs memcpy(buf, &naddr, sizeof(naddr)); 36393ca3bb5STimo Teräs } 36493ca3bb5STimo Teräs 365dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 3661da177e4SLinus Torvalds #include <linux/ipv6.h> 3671da177e4SLinus Torvalds #endif 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvalds static __inline__ void inet_reset_saddr(struct sock *sk) 3701da177e4SLinus Torvalds { 371c720c7e8SEric Dumazet inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; 372dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 3731da177e4SLinus Torvalds if (sk->sk_family == PF_INET6) { 3741da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 3751da177e4SLinus Torvalds 3761da177e4SLinus Torvalds memset(&np->saddr, 0, sizeof(np->saddr)); 3771da177e4SLinus Torvalds memset(&np->rcv_saddr, 0, sizeof(np->rcv_saddr)); 3781da177e4SLinus Torvalds } 3791da177e4SLinus Torvalds #endif 3801da177e4SLinus Torvalds } 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds #endif 3831da177e4SLinus Torvalds 3847ad6848cSOctavian Purdila static inline int sk_mc_loop(struct sock *sk) 3857ad6848cSOctavian Purdila { 3867ad6848cSOctavian Purdila if (!sk) 3877ad6848cSOctavian Purdila return 1; 3887ad6848cSOctavian Purdila switch (sk->sk_family) { 3897ad6848cSOctavian Purdila case AF_INET: 3907ad6848cSOctavian Purdila return inet_sk(sk)->mc_loop; 391dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 3927ad6848cSOctavian Purdila case AF_INET6: 3937ad6848cSOctavian Purdila return inet6_sk(sk)->mc_loop; 3947ad6848cSOctavian Purdila #endif 3957ad6848cSOctavian Purdila } 396cd65c3c7SOctavian Purdila WARN_ON(1); 3977ad6848cSOctavian Purdila return 1; 3987ad6848cSOctavian Purdila } 3997ad6848cSOctavian Purdila 4005c3a0fd7SJoe Perches bool ip_call_ra_chain(struct sk_buff *skb); 4011da177e4SLinus Torvalds 4021da177e4SLinus Torvalds /* 403b798232fSRami Rosen * Functions provided by ip_fragment.c 4041da177e4SLinus Torvalds */ 4051da177e4SLinus Torvalds 406fd2c3ef7SEric Dumazet enum ip_defrag_users { 4071da177e4SLinus Torvalds IP_DEFRAG_LOCAL_DELIVER, 4081da177e4SLinus Torvalds IP_DEFRAG_CALL_RA_CHAIN, 4091da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_IN, 4104be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, 4111da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_OUT, 4124be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 4138fa9ff68SPatrick McHardy IP_DEFRAG_CONNTRACK_BRIDGE_IN, 4144be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 4151da177e4SLinus Torvalds IP_DEFRAG_VS_IN, 4161da177e4SLinus Torvalds IP_DEFRAG_VS_OUT, 417595fc71bSDavid S. Miller IP_DEFRAG_VS_FWD, 418595fc71bSDavid S. Miller IP_DEFRAG_AF_PACKET, 419bc416d97SEric Dumazet IP_DEFRAG_MACVLAN, 4201da177e4SLinus Torvalds }; 4211da177e4SLinus Torvalds 422776c729eSHerbert Xu int ip_defrag(struct sk_buff *skb, u32 user); 423bc416d97SEric Dumazet #ifdef CONFIG_INET 424bc416d97SEric Dumazet struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user); 425bc416d97SEric Dumazet #else 426bc416d97SEric Dumazet static inline struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user) 427bc416d97SEric Dumazet { 428bc416d97SEric Dumazet return skb; 429bc416d97SEric Dumazet } 430bc416d97SEric Dumazet #endif 4316ddc0822SPavel Emelyanov int ip_frag_mem(struct net *net); 432e5a2bb84SPavel Emelyanov int ip_frag_nqueues(struct net *net); 4331da177e4SLinus Torvalds 4341da177e4SLinus Torvalds /* 4351da177e4SLinus Torvalds * Functions provided by ip_forward.c 4361da177e4SLinus Torvalds */ 4371da177e4SLinus Torvalds 4385c3a0fd7SJoe Perches int ip_forward(struct sk_buff *skb); 4391da177e4SLinus Torvalds 4401da177e4SLinus Torvalds /* 4411da177e4SLinus Torvalds * Functions provided by ip_options.c 4421da177e4SLinus Torvalds */ 4431da177e4SLinus Torvalds 4445c3a0fd7SJoe Perches void ip_options_build(struct sk_buff *skb, struct ip_options *opt, 445f6d8bd05SEric Dumazet __be32 daddr, struct rtable *rt, int is_frag); 4465c3a0fd7SJoe Perches int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb); 4475c3a0fd7SJoe Perches void ip_options_fragment(struct sk_buff *skb); 4485c3a0fd7SJoe Perches int ip_options_compile(struct net *net, struct ip_options *opt, 4495c3a0fd7SJoe Perches struct sk_buff *skb); 4505c3a0fd7SJoe Perches int ip_options_get(struct net *net, struct ip_options_rcu **optp, 4514c6ea29dSArnaldo Carvalho de Melo unsigned char *data, int optlen); 4525c3a0fd7SJoe Perches int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, 4534c6ea29dSArnaldo Carvalho de Melo unsigned char __user *data, int optlen); 4545c3a0fd7SJoe Perches void ip_options_undo(struct ip_options *opt); 4555c3a0fd7SJoe Perches void ip_forward_options(struct sk_buff *skb); 4565c3a0fd7SJoe Perches int ip_options_rcv_srr(struct sk_buff *skb); 4571da177e4SLinus Torvalds 4581da177e4SLinus Torvalds /* 4591da177e4SLinus Torvalds * Functions provided by ip_sockglue.c 4601da177e4SLinus Torvalds */ 4611da177e4SLinus Torvalds 4625c3a0fd7SJoe Perches void ipv4_pktinfo_prepare(struct sk_buff *skb); 4635c3a0fd7SJoe Perches void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb); 4645c3a0fd7SJoe Perches int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc); 4655c3a0fd7SJoe Perches int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, 4665c3a0fd7SJoe Perches unsigned int optlen); 4675c3a0fd7SJoe Perches int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, 4685c3a0fd7SJoe Perches int __user *optlen); 4695c3a0fd7SJoe Perches int compat_ip_setsockopt(struct sock *sk, int level, int optname, 4705c3a0fd7SJoe Perches char __user *optval, unsigned int optlen); 4715c3a0fd7SJoe Perches int compat_ip_getsockopt(struct sock *sk, int level, int optname, 4725c3a0fd7SJoe Perches char __user *optval, int __user *optlen); 4735c3a0fd7SJoe Perches int ip_ra_control(struct sock *sk, unsigned char on, 4745c3a0fd7SJoe Perches void (*destructor)(struct sock *)); 4751da177e4SLinus Torvalds 4765c3a0fd7SJoe Perches int ip_recv_error(struct sock *sk, struct msghdr *msg, int len); 4775c3a0fd7SJoe Perches void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 4785c3a0fd7SJoe Perches u32 info, u8 *payload); 4795c3a0fd7SJoe Perches void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, 4801da177e4SLinus Torvalds u32 info); 4811da177e4SLinus Torvalds 48220380731SArnaldo Carvalho de Melo #ifdef CONFIG_PROC_FS 4835c3a0fd7SJoe Perches int ip_misc_proc_init(void); 48420380731SArnaldo Carvalho de Melo #endif 48520380731SArnaldo Carvalho de Melo 4861da177e4SLinus Torvalds #endif /* _IP_H */ 487