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> 341bd758ebSJiri Pirko #include <net/flow_dissector.h> 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds struct sock; 371da177e4SLinus Torvalds 38fd2c3ef7SEric Dumazet struct inet_skb_parm { 391da177e4SLinus Torvalds struct ip_options opt; /* Compiled IP options */ 401da177e4SLinus Torvalds unsigned char flags; 411da177e4SLinus Torvalds 42df4d9254SHannes Frederic Sowa #define IPSKB_FORWARDED BIT(0) 43df4d9254SHannes Frederic Sowa #define IPSKB_XFRM_TUNNEL_SIZE BIT(1) 44df4d9254SHannes Frederic Sowa #define IPSKB_XFRM_TRANSFORMED BIT(2) 45df4d9254SHannes Frederic Sowa #define IPSKB_FRAG_COMPLETE BIT(3) 46df4d9254SHannes Frederic Sowa #define IPSKB_REROUTED BIT(4) 47df4d9254SHannes Frederic Sowa #define IPSKB_DOREDIRECT BIT(5) 48d6b915e2SFlorian Westphal #define IPSKB_FRAG_PMTU BIT(6) 495f2d04f1SPatrick McHardy 505f2d04f1SPatrick McHardy u16 frag_max_size; 511da177e4SLinus Torvalds }; 521da177e4SLinus Torvalds 53c9bdd4b5SArnaldo Carvalho de Melo static inline unsigned int ip_hdrlen(const struct sk_buff *skb) 54c9bdd4b5SArnaldo Carvalho de Melo { 55eddc9ec5SArnaldo Carvalho de Melo return ip_hdr(skb)->ihl * 4; 56c9bdd4b5SArnaldo Carvalho de Melo } 57c9bdd4b5SArnaldo Carvalho de Melo 58fd2c3ef7SEric Dumazet struct ipcm_cookie { 5924025c46SSoheil Hassas Yeganeh struct sockcm_cookie sockc; 60c1d18f9fSAl Viro __be32 addr; 611da177e4SLinus Torvalds int oif; 62f6d8bd05SEric Dumazet struct ip_options_rcu *opt; 632244d07bSOliver Hartkopp __u8 tx_flags; 64f02db315SFrancesco Fusco __u8 ttl; 65f02db315SFrancesco Fusco __s16 tos; 66f02db315SFrancesco Fusco char priority; 671da177e4SLinus Torvalds }; 681da177e4SLinus Torvalds 691da177e4SLinus Torvalds #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) 704b261c75SHannes Frederic Sowa #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) 711da177e4SLinus Torvalds 72fd2c3ef7SEric Dumazet struct ip_ra_chain { 7343a951e9SEric Dumazet struct ip_ra_chain __rcu *next; 741da177e4SLinus Torvalds struct sock *sk; 75592fcb9dSEric Dumazet union { 761da177e4SLinus Torvalds void (*destructor)(struct sock *); 77592fcb9dSEric Dumazet struct sock *saved_sk; 78592fcb9dSEric Dumazet }; 7966018506SEric Dumazet struct rcu_head rcu; 801da177e4SLinus Torvalds }; 811da177e4SLinus Torvalds 8243a951e9SEric Dumazet extern struct ip_ra_chain __rcu *ip_ra_chain; 831da177e4SLinus Torvalds 841da177e4SLinus Torvalds /* IP flags. */ 851da177e4SLinus Torvalds #define IP_CE 0x8000 /* Flag: "Congestion" */ 861da177e4SLinus Torvalds #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ 871da177e4SLinus Torvalds #define IP_MF 0x2000 /* Flag: "More Fragments" */ 881da177e4SLinus Torvalds #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ 911da177e4SLinus Torvalds 9214c85021SArnaldo Carvalho de Melo struct msghdr; 9314c85021SArnaldo Carvalho de Melo struct net_device; 9414c85021SArnaldo Carvalho de Melo struct packet_type; 9514c85021SArnaldo Carvalho de Melo struct rtable; 9614c85021SArnaldo Carvalho de Melo struct sockaddr; 9714c85021SArnaldo Carvalho de Melo 9872c1d3bdSWANG Cong int igmp_mc_init(void); 991da177e4SLinus Torvalds 1001da177e4SLinus Torvalds /* 1011da177e4SLinus Torvalds * Functions provided by ip.c 1021da177e4SLinus Torvalds */ 1031da177e4SLinus Torvalds 104cfe673b0SEric Dumazet int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk, 10513d8eaa0SAl Viro __be32 saddr, __be32 daddr, 106f6d8bd05SEric Dumazet struct ip_options_rcu *opt); 1075c3a0fd7SJoe Perches int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, 1085c3a0fd7SJoe Perches struct net_device *orig_dev); 1095c3a0fd7SJoe Perches int ip_local_deliver(struct sk_buff *skb); 1105c3a0fd7SJoe Perches int ip_mr_input(struct sk_buff *skb); 111ede2059dSEric W. Biederman int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb); 112ede2059dSEric W. Biederman int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb); 113694869b3SEric W. Biederman int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, 114694869b3SEric W. Biederman int (*output)(struct net *, struct sock *, struct sk_buff *)); 1155c3a0fd7SJoe Perches void ip_send_check(struct iphdr *ip); 116cf91a99dSEric W. Biederman int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 11733224b16SEric W. Biederman int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); 118aad88724SEric Dumazet 119b0270e91SEric Dumazet int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl); 1205c3a0fd7SJoe Perches void ip_init(void); 1215c3a0fd7SJoe Perches int ip_append_data(struct sock *sk, struct flowi4 *fl4, 1221da177e4SLinus Torvalds int getfrag(void *from, char *to, int offset, int len, 1231da177e4SLinus Torvalds int odd, struct sk_buff *skb), 1241da177e4SLinus Torvalds void *from, int len, int protolen, 1251da177e4SLinus Torvalds struct ipcm_cookie *ipc, 1262e77d89bSEric Dumazet struct rtable **rt, 1271da177e4SLinus Torvalds unsigned int flags); 1285c3a0fd7SJoe Perches int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, 1295c3a0fd7SJoe Perches struct sk_buff *skb); 1305c3a0fd7SJoe Perches ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, 1311da177e4SLinus Torvalds int offset, size_t size, int flags); 1325c3a0fd7SJoe Perches struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, 1331c32c5adSHerbert Xu struct sk_buff_head *queue, 1341c32c5adSHerbert Xu struct inet_cork *cork); 1355c3a0fd7SJoe Perches int ip_send_skb(struct net *net, struct sk_buff *skb); 1365c3a0fd7SJoe Perches int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); 1375c3a0fd7SJoe Perches void ip_flush_pending_frames(struct sock *sk); 1385c3a0fd7SJoe Perches struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, 1395c3a0fd7SJoe Perches int getfrag(void *from, char *to, int offset, 1405c3a0fd7SJoe Perches int len, int odd, struct sk_buff *skb), 1411c32c5adSHerbert Xu void *from, int length, int transhdrlen, 1425c3a0fd7SJoe Perches struct ipcm_cookie *ipc, struct rtable **rtp, 1431c32c5adSHerbert Xu unsigned int flags); 1441c32c5adSHerbert Xu 14577968b78SDavid S. Miller static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) 1461c32c5adSHerbert Xu { 14777968b78SDavid S. Miller return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); 1481c32c5adSHerbert Xu } 1491da177e4SLinus Torvalds 150aa661581SFrancesco Fusco static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) 151aa661581SFrancesco Fusco { 152aa661581SFrancesco Fusco return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); 153aa661581SFrancesco Fusco } 154aa661581SFrancesco Fusco 155aa661581SFrancesco Fusco static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) 156aa661581SFrancesco Fusco { 157aa661581SFrancesco Fusco return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); 158aa661581SFrancesco Fusco } 159aa661581SFrancesco Fusco 1601da177e4SLinus Torvalds /* datagram.c */ 16103645a11SEric Dumazet int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); 1625c3a0fd7SJoe Perches int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); 1631da177e4SLinus Torvalds 1645c3a0fd7SJoe Perches void ip4_datagram_release_cb(struct sock *sk); 1658141ed9fSSteffen Klassert 1661da177e4SLinus Torvalds struct ip_reply_arg { 1671da177e4SLinus Torvalds struct kvec iov[1]; 16888ef4a5aSKOVACS Krisztian int flags; 169d6f5493cSAl Viro __wsum csum; 1701da177e4SLinus Torvalds int csumoffset; /* u16 offset of csum in iov[0].iov_base */ 1711da177e4SLinus Torvalds /* -1 if not needed */ 172f0e48dbfSPatrick McHardy int bound_dev_if; 17366b13d99SEric Dumazet u8 tos; 1741da177e4SLinus Torvalds }; 1751da177e4SLinus Torvalds 17688ef4a5aSKOVACS Krisztian #define IP_REPLY_ARG_NOSRCCHECK 1 17788ef4a5aSKOVACS Krisztian 17886b08d86SKOVACS Krisztian static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) 17986b08d86SKOVACS Krisztian { 18086b08d86SKOVACS Krisztian return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; 18186b08d86SKOVACS Krisztian } 18286b08d86SKOVACS Krisztian 183bdbbb852SEric Dumazet void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, 18424a2d43dSEric Dumazet const struct ip_options *sopt, 18524a2d43dSEric Dumazet __be32 daddr, __be32 saddr, 18624a2d43dSEric Dumazet const struct ip_reply_arg *arg, 18770e73416SDavid S. Miller unsigned int len); 1881da177e4SLinus Torvalds 1894ce3c183SEric Dumazet #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) 19013415e46SEric Dumazet #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field) 1914ce3c183SEric Dumazet #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) 19213415e46SEric Dumazet #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) 1934ce3c183SEric Dumazet #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) 19413415e46SEric Dumazet #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) 19561a7e260SPavel Emelyanov #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) 19613415e46SEric Dumazet #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field) 197f7324acdSDavid S. Miller #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) 19813415e46SEric Dumazet #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) 1991da177e4SLinus Torvalds 200c4c6bc31SRaghavendra K T u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct); 201698365faSWANG Cong unsigned long snmp_fold_field(void __percpu *mib, int offt); 2024ce3c183SEric Dumazet #if BITS_PER_LONG==32 203c4c6bc31SRaghavendra K T u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, 204c4c6bc31SRaghavendra K T size_t syncp_offset); 205698365faSWANG Cong u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); 2064ce3c183SEric Dumazet #else 207c4c6bc31SRaghavendra K T static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, 208c4c6bc31SRaghavendra K T size_t syncp_offset) 209c4c6bc31SRaghavendra K T { 210c4c6bc31SRaghavendra K T return snmp_get_cpu_field(mib, cpu, offct); 211c4c6bc31SRaghavendra K T 212c4c6bc31SRaghavendra K T } 213c4c6bc31SRaghavendra K T 214698365faSWANG Cong static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) 2154ce3c183SEric Dumazet { 2164ce3c183SEric Dumazet return snmp_fold_field(mib, offt); 2174ce3c183SEric Dumazet } 2184ce3c183SEric Dumazet #endif 21933490170SYOSHIFUJI Hideaki 2200bbf87d8SEric W. Biederman void inet_get_local_port_range(struct net *net, int *low, int *high); 221227b60f5SStephen Hemminger 222fcd77db0SDavid S. Miller #ifdef CONFIG_SYSCTL 223122ff243SWANG Cong static inline int inet_is_local_reserved_port(struct net *net, int port) 224e3826f1eSAmerigo Wang { 225122ff243SWANG Cong if (!net->ipv4.sysctl_local_reserved_ports) 226122ff243SWANG Cong return 0; 227122ff243SWANG Cong return test_bit(port, net->ipv4.sysctl_local_reserved_ports); 228e3826f1eSAmerigo Wang } 22920e61da7SWANG Cong 23020e61da7SWANG Cong static inline bool sysctl_dev_name_is_allowed(const char *name) 23120e61da7SWANG Cong { 23220e61da7SWANG Cong return strcmp(name, "default") != 0 && strcmp(name, "all") != 0; 23320e61da7SWANG Cong } 23420e61da7SWANG Cong 235122ff243SWANG Cong #else 236122ff243SWANG Cong static inline int inet_is_local_reserved_port(struct net *net, int port) 237122ff243SWANG Cong { 238122ff243SWANG Cong return 0; 239122ff243SWANG Cong } 240122ff243SWANG Cong #endif 241e3826f1eSAmerigo Wang 242822c8685SDeepa Dinamani __be32 inet_current_timestamp(void); 243822c8685SDeepa Dinamani 24420380731SArnaldo Carvalho de Melo /* From inetpeer.c */ 24520380731SArnaldo Carvalho de Melo extern int inet_peer_threshold; 24620380731SArnaldo Carvalho de Melo extern int inet_peer_minttl; 24720380731SArnaldo Carvalho de Melo extern int inet_peer_maxttl; 24820380731SArnaldo Carvalho de Melo 2495c3a0fd7SJoe Perches void ipfrag_init(void); 25020380731SArnaldo Carvalho de Melo 2515c3a0fd7SJoe Perches void ip_static_sysctl_init(void); 252bd7b1533SAl Viro 253e110861fSLorenzo Colitti #define IP4_REPLY_MARK(net, mark) \ 254e110861fSLorenzo Colitti ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) 255e110861fSLorenzo Colitti 256d18cd551SDavid S. Miller static inline bool ip_is_fragment(const struct iphdr *iph) 257d18cd551SDavid S. Miller { 258d18cd551SDavid S. Miller return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; 259d18cd551SDavid S. Miller } 260d18cd551SDavid S. Miller 2611da177e4SLinus Torvalds #ifdef CONFIG_INET 26214c85021SArnaldo Carvalho de Melo #include <net/dst.h> 26314c85021SArnaldo Carvalho de Melo 2641da177e4SLinus Torvalds /* The function in 2.2 was invalid, producing wrong result for 2651da177e4SLinus Torvalds * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ 2661da177e4SLinus Torvalds static inline 2671da177e4SLinus Torvalds int ip_decrease_ttl(struct iphdr *iph) 2681da177e4SLinus Torvalds { 2695c78f275SAl Viro u32 check = (__force u32)iph->check; 2705c78f275SAl Viro check += (__force u32)htons(0x0100); 2715c78f275SAl Viro iph->check = (__force __sum16)(check + (check>=0xFFFF)); 2721da177e4SLinus Torvalds return --iph->ttl; 2731da177e4SLinus Torvalds } 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvalds static inline 2764e3f5d72SEric Dumazet int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst) 2771da177e4SLinus Torvalds { 2784e3f5d72SEric Dumazet u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); 2794e3f5d72SEric Dumazet 2804e3f5d72SEric Dumazet return pmtudisc == IP_PMTUDISC_DO || 2814e3f5d72SEric Dumazet (pmtudisc == IP_PMTUDISC_WANT && 282a02cec21SEric Dumazet !(dst_metric_locked(dst, RTAX_MTU))); 2831da177e4SLinus Torvalds } 2841da177e4SLinus Torvalds 285f87c10a8SHannes Frederic Sowa static inline bool ip_sk_accept_pmtu(const struct sock *sk) 286f87c10a8SHannes Frederic Sowa { 2871b346576SHannes Frederic Sowa return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && 2881b346576SHannes Frederic Sowa inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; 289f87c10a8SHannes Frederic Sowa } 290f87c10a8SHannes Frederic Sowa 291f87c10a8SHannes Frederic Sowa static inline bool ip_sk_use_pmtu(const struct sock *sk) 292f87c10a8SHannes Frederic Sowa { 293f87c10a8SHannes Frederic Sowa return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; 294f87c10a8SHannes Frederic Sowa } 295f87c10a8SHannes Frederic Sowa 29660ff7467SWANG Cong static inline bool ip_sk_ignore_df(const struct sock *sk) 2971b346576SHannes Frederic Sowa { 2981b346576SHannes Frederic Sowa return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || 2991b346576SHannes Frederic Sowa inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; 3001b346576SHannes Frederic Sowa } 3011b346576SHannes Frederic Sowa 302f87c10a8SHannes Frederic Sowa static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, 303f87c10a8SHannes Frederic Sowa bool forwarding) 304f87c10a8SHannes Frederic Sowa { 305f87c10a8SHannes Frederic Sowa struct net *net = dev_net(dst->dev); 306f87c10a8SHannes Frederic Sowa 307f87c10a8SHannes Frederic Sowa if (net->ipv4.sysctl_ip_fwd_use_pmtu || 308f87c10a8SHannes Frederic Sowa dst_metric_locked(dst, RTAX_MTU) || 309f87c10a8SHannes Frederic Sowa !forwarding) 310f87c10a8SHannes Frederic Sowa return dst_mtu(dst); 311f87c10a8SHannes Frederic Sowa 312f87c10a8SHannes Frederic Sowa return min(dst->dev->mtu, IP_MAX_MTU); 313f87c10a8SHannes Frederic Sowa } 314f87c10a8SHannes Frederic Sowa 315f87c10a8SHannes Frederic Sowa static inline unsigned int ip_skb_dst_mtu(const struct sk_buff *skb) 316f87c10a8SHannes Frederic Sowa { 317caf3f267SEric Dumazet struct sock *sk = skb->sk; 318caf3f267SEric Dumazet 319caf3f267SEric Dumazet if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { 320f87c10a8SHannes Frederic Sowa bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; 321caf3f267SEric Dumazet 322f87c10a8SHannes Frederic Sowa return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); 323f87c10a8SHannes Frederic Sowa } 324caf3f267SEric Dumazet 325caf3f267SEric Dumazet return min(skb_dst(skb)->dev->mtu, IP_MAX_MTU); 326f87c10a8SHannes Frederic Sowa } 327f87c10a8SHannes Frederic Sowa 32804ca6973SEric Dumazet u32 ip_idents_reserve(u32 hash, int segs); 329b6a7719aSHannes Frederic Sowa void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); 33073f156a6SEric Dumazet 331b6a7719aSHannes Frederic Sowa static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, 332b6a7719aSHannes Frederic Sowa struct sock *sk, int segs) 3331da177e4SLinus Torvalds { 334703133deSAnsis Atteka struct iphdr *iph = ip_hdr(skb); 335703133deSAnsis Atteka 33660ff7467SWANG Cong if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { 3371da177e4SLinus Torvalds /* This is only to work around buggy Windows95/2000 3381da177e4SLinus Torvalds * VJ compression implementations. If the ID field 3391da177e4SLinus Torvalds * does not change, they drop every other packet in 3401da177e4SLinus Torvalds * a TCP stream using header compression. 3411da177e4SLinus Torvalds */ 342c720c7e8SEric Dumazet if (sk && inet_sk(sk)->inet_daddr) { 343c720c7e8SEric Dumazet iph->id = htons(inet_sk(sk)->inet_id); 34473f156a6SEric Dumazet inet_sk(sk)->inet_id += segs; 34573f156a6SEric Dumazet } else { 3461da177e4SLinus Torvalds iph->id = 0; 34773f156a6SEric Dumazet } 34873f156a6SEric Dumazet } else { 349b6a7719aSHannes Frederic Sowa __ip_select_ident(net, iph, segs); 35073f156a6SEric Dumazet } 35173f156a6SEric Dumazet } 35273f156a6SEric Dumazet 353b6a7719aSHannes Frederic Sowa static inline void ip_select_ident(struct net *net, struct sk_buff *skb, 354b6a7719aSHannes Frederic Sowa struct sock *sk) 35573f156a6SEric Dumazet { 356b6a7719aSHannes Frederic Sowa ip_select_ident_segs(net, skb, sk, 1); 3571da177e4SLinus Torvalds } 3581da177e4SLinus Torvalds 359ed70fcfcSTom Herbert static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) 360ed70fcfcSTom Herbert { 361ed70fcfcSTom Herbert return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, 362ed70fcfcSTom Herbert skb->len, proto, 0); 363ed70fcfcSTom Herbert } 364ed70fcfcSTom Herbert 365c3f83241STom Herbert /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store 366c3f83241STom Herbert * Equivalent to : flow->v4addrs.src = iph->saddr; 367c3f83241STom Herbert * flow->v4addrs.dst = iph->daddr; 368c3f83241STom Herbert */ 369c3f83241STom Herbert static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, 370c3f83241STom Herbert const struct iphdr *iph) 371c3f83241STom Herbert { 372c3f83241STom Herbert BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != 373c3f83241STom Herbert offsetof(typeof(flow->addrs), v4addrs.src) + 374c3f83241STom Herbert sizeof(flow->addrs.v4addrs.src)); 375c3f83241STom Herbert memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs)); 376c3f83241STom Herbert flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; 377c3f83241STom Herbert } 378c3f83241STom Herbert 3791933a785STom Herbert static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto) 3801933a785STom Herbert { 3811933a785STom Herbert const struct iphdr *iph = skb_gro_network_header(skb); 3821933a785STom Herbert 3831933a785STom Herbert return csum_tcpudp_nofold(iph->saddr, iph->daddr, 3841933a785STom Herbert skb_gro_len(skb), proto, 0); 3851933a785STom Herbert } 3861933a785STom Herbert 3871da177e4SLinus Torvalds /* 3881da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type ethernet. 3891da177e4SLinus Torvalds */ 3901da177e4SLinus Torvalds 391714e85beSAl Viro static inline void ip_eth_mc_map(__be32 naddr, char *buf) 3921da177e4SLinus Torvalds { 393714e85beSAl Viro __u32 addr=ntohl(naddr); 3941da177e4SLinus Torvalds buf[0]=0x01; 3951da177e4SLinus Torvalds buf[1]=0x00; 3961da177e4SLinus Torvalds buf[2]=0x5e; 3971da177e4SLinus Torvalds buf[5]=addr&0xFF; 3981da177e4SLinus Torvalds addr>>=8; 3991da177e4SLinus Torvalds buf[4]=addr&0xFF; 4001da177e4SLinus Torvalds addr>>=8; 4011da177e4SLinus Torvalds buf[3]=addr&0x7F; 4021da177e4SLinus Torvalds } 4031da177e4SLinus Torvalds 4041da177e4SLinus Torvalds /* 4051da177e4SLinus Torvalds * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. 4061da177e4SLinus Torvalds * Leave P_Key as 0 to be filled in by driver. 4071da177e4SLinus Torvalds */ 4081da177e4SLinus Torvalds 409a9e527e3SRolf Manderscheid static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 4101da177e4SLinus Torvalds { 411714e85beSAl Viro __u32 addr; 412a9e527e3SRolf Manderscheid unsigned char scope = broadcast[5] & 0xF; 413a9e527e3SRolf Manderscheid 4141da177e4SLinus Torvalds buf[0] = 0; /* Reserved */ 4151da177e4SLinus Torvalds buf[1] = 0xff; /* Multicast QPN */ 4161da177e4SLinus Torvalds buf[2] = 0xff; 4171da177e4SLinus Torvalds buf[3] = 0xff; 418714e85beSAl Viro addr = ntohl(naddr); 4191da177e4SLinus Torvalds buf[4] = 0xff; 420a9e527e3SRolf Manderscheid buf[5] = 0x10 | scope; /* scope from broadcast address */ 4211da177e4SLinus Torvalds buf[6] = 0x40; /* IPv4 signature */ 4221da177e4SLinus Torvalds buf[7] = 0x1b; 423a9e527e3SRolf Manderscheid buf[8] = broadcast[8]; /* P_Key */ 424a9e527e3SRolf Manderscheid buf[9] = broadcast[9]; 4251da177e4SLinus Torvalds buf[10] = 0; 4261da177e4SLinus Torvalds buf[11] = 0; 4271da177e4SLinus Torvalds buf[12] = 0; 4281da177e4SLinus Torvalds buf[13] = 0; 4291da177e4SLinus Torvalds buf[14] = 0; 4301da177e4SLinus Torvalds buf[15] = 0; 4311da177e4SLinus Torvalds buf[19] = addr & 0xff; 4321da177e4SLinus Torvalds addr >>= 8; 4331da177e4SLinus Torvalds buf[18] = addr & 0xff; 4341da177e4SLinus Torvalds addr >>= 8; 4351da177e4SLinus Torvalds buf[17] = addr & 0xff; 4361da177e4SLinus Torvalds addr >>= 8; 4371da177e4SLinus Torvalds buf[16] = addr & 0x0f; 4381da177e4SLinus Torvalds } 4391da177e4SLinus Torvalds 44093ca3bb5STimo Teräs static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf) 44193ca3bb5STimo Teräs { 44293ca3bb5STimo Teräs if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) 44393ca3bb5STimo Teräs memcpy(buf, broadcast, 4); 44493ca3bb5STimo Teräs else 44593ca3bb5STimo Teräs memcpy(buf, &naddr, sizeof(naddr)); 44693ca3bb5STimo Teräs } 44793ca3bb5STimo Teräs 448dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 4491da177e4SLinus Torvalds #include <linux/ipv6.h> 4501da177e4SLinus Torvalds #endif 4511da177e4SLinus Torvalds 4521da177e4SLinus Torvalds static __inline__ void inet_reset_saddr(struct sock *sk) 4531da177e4SLinus Torvalds { 454c720c7e8SEric Dumazet inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0; 455dfd56b8bSEric Dumazet #if IS_ENABLED(CONFIG_IPV6) 4561da177e4SLinus Torvalds if (sk->sk_family == PF_INET6) { 4571da177e4SLinus Torvalds struct ipv6_pinfo *np = inet6_sk(sk); 4581da177e4SLinus Torvalds 4591da177e4SLinus Torvalds memset(&np->saddr, 0, sizeof(np->saddr)); 460efe4208fSEric Dumazet memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); 4611da177e4SLinus Torvalds } 4621da177e4SLinus Torvalds #endif 4631da177e4SLinus Torvalds } 4641da177e4SLinus Torvalds 4651da177e4SLinus Torvalds #endif 4661da177e4SLinus Torvalds 46772afa352SDavid Ahern static inline unsigned int ipv4_addr_hash(__be32 ip) 46872afa352SDavid Ahern { 46972afa352SDavid Ahern return (__force unsigned int) ip; 47072afa352SDavid Ahern } 47172afa352SDavid Ahern 4725c3a0fd7SJoe Perches bool ip_call_ra_chain(struct sk_buff *skb); 4731da177e4SLinus Torvalds 4741da177e4SLinus Torvalds /* 475b798232fSRami Rosen * Functions provided by ip_fragment.c 4761da177e4SLinus Torvalds */ 4771da177e4SLinus Torvalds 478fd2c3ef7SEric Dumazet enum ip_defrag_users { 4791da177e4SLinus Torvalds IP_DEFRAG_LOCAL_DELIVER, 4801da177e4SLinus Torvalds IP_DEFRAG_CALL_RA_CHAIN, 4811da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_IN, 4824be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, 4831da177e4SLinus Torvalds IP_DEFRAG_CONNTRACK_OUT, 4844be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, 4858fa9ff68SPatrick McHardy IP_DEFRAG_CONNTRACK_BRIDGE_IN, 4864be929beSAlexey Dobriyan __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, 4871da177e4SLinus Torvalds IP_DEFRAG_VS_IN, 4881da177e4SLinus Torvalds IP_DEFRAG_VS_OUT, 489595fc71bSDavid S. Miller IP_DEFRAG_VS_FWD, 490595fc71bSDavid S. Miller IP_DEFRAG_AF_PACKET, 491bc416d97SEric Dumazet IP_DEFRAG_MACVLAN, 4921da177e4SLinus Torvalds }; 4931da177e4SLinus Torvalds 4945cf42280SAndy Zhou /* Return true if the value of 'user' is between 'lower_bond' 4955cf42280SAndy Zhou * and 'upper_bond' inclusively. 4965cf42280SAndy Zhou */ 4975cf42280SAndy Zhou static inline bool ip_defrag_user_in_between(u32 user, 4985cf42280SAndy Zhou enum ip_defrag_users lower_bond, 4995cf42280SAndy Zhou enum ip_defrag_users upper_bond) 5005cf42280SAndy Zhou { 5015cf42280SAndy Zhou return user >= lower_bond && user <= upper_bond; 5025cf42280SAndy Zhou } 5035cf42280SAndy Zhou 50419bcf9f2SEric W. Biederman int ip_defrag(struct net *net, struct sk_buff *skb, u32 user); 505bc416d97SEric Dumazet #ifdef CONFIG_INET 50619bcf9f2SEric W. Biederman struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user); 507bc416d97SEric Dumazet #else 50819bcf9f2SEric W. Biederman static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user) 509bc416d97SEric Dumazet { 510bc416d97SEric Dumazet return skb; 511bc416d97SEric Dumazet } 512bc416d97SEric Dumazet #endif 5136ddc0822SPavel Emelyanov int ip_frag_mem(struct net *net); 5141da177e4SLinus Torvalds 5151da177e4SLinus Torvalds /* 5161da177e4SLinus Torvalds * Functions provided by ip_forward.c 5171da177e4SLinus Torvalds */ 5181da177e4SLinus Torvalds 5195c3a0fd7SJoe Perches int ip_forward(struct sk_buff *skb); 5201da177e4SLinus Torvalds 5211da177e4SLinus Torvalds /* 5221da177e4SLinus Torvalds * Functions provided by ip_options.c 5231da177e4SLinus Torvalds */ 5241da177e4SLinus Torvalds 5255c3a0fd7SJoe Perches void ip_options_build(struct sk_buff *skb, struct ip_options *opt, 526f6d8bd05SEric Dumazet __be32 daddr, struct rtable *rt, int is_frag); 52724a2d43dSEric Dumazet 52824a2d43dSEric Dumazet int __ip_options_echo(struct ip_options *dopt, struct sk_buff *skb, 52924a2d43dSEric Dumazet const struct ip_options *sopt); 53024a2d43dSEric Dumazet static inline int ip_options_echo(struct ip_options *dopt, struct sk_buff *skb) 53124a2d43dSEric Dumazet { 53224a2d43dSEric Dumazet return __ip_options_echo(dopt, skb, &IPCB(skb)->opt); 53324a2d43dSEric Dumazet } 53424a2d43dSEric Dumazet 5355c3a0fd7SJoe Perches void ip_options_fragment(struct sk_buff *skb); 5365c3a0fd7SJoe Perches int ip_options_compile(struct net *net, struct ip_options *opt, 5375c3a0fd7SJoe Perches struct sk_buff *skb); 5385c3a0fd7SJoe Perches int ip_options_get(struct net *net, struct ip_options_rcu **optp, 5394c6ea29dSArnaldo Carvalho de Melo unsigned char *data, int optlen); 5405c3a0fd7SJoe Perches int ip_options_get_from_user(struct net *net, struct ip_options_rcu **optp, 5414c6ea29dSArnaldo Carvalho de Melo unsigned char __user *data, int optlen); 5425c3a0fd7SJoe Perches void ip_options_undo(struct ip_options *opt); 5435c3a0fd7SJoe Perches void ip_forward_options(struct sk_buff *skb); 5445c3a0fd7SJoe Perches int ip_options_rcv_srr(struct sk_buff *skb); 5451da177e4SLinus Torvalds 5461da177e4SLinus Torvalds /* 5471da177e4SLinus Torvalds * Functions provided by ip_sockglue.c 5481da177e4SLinus Torvalds */ 5491da177e4SLinus Torvalds 550fbf8866dSShawn Bohrer void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb); 5515961de9fSTom Herbert void ip_cmsg_recv_offset(struct msghdr *msg, struct sk_buff *skb, int offset); 55224025c46SSoheil Hassas Yeganeh int ip_cmsg_send(struct sock *sk, struct msghdr *msg, 553c8e6ad08SHannes Frederic Sowa struct ipcm_cookie *ipc, bool allow_ipv6); 5545c3a0fd7SJoe Perches int ip_setsockopt(struct sock *sk, int level, int optname, char __user *optval, 5555c3a0fd7SJoe Perches unsigned int optlen); 5565c3a0fd7SJoe Perches int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, 5575c3a0fd7SJoe Perches int __user *optlen); 5585c3a0fd7SJoe Perches int compat_ip_setsockopt(struct sock *sk, int level, int optname, 5595c3a0fd7SJoe Perches char __user *optval, unsigned int optlen); 5605c3a0fd7SJoe Perches int compat_ip_getsockopt(struct sock *sk, int level, int optname, 5615c3a0fd7SJoe Perches char __user *optval, int __user *optlen); 5625c3a0fd7SJoe Perches int ip_ra_control(struct sock *sk, unsigned char on, 5635c3a0fd7SJoe Perches void (*destructor)(struct sock *)); 5641da177e4SLinus Torvalds 56585fbaa75SHannes Frederic Sowa int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len); 5665c3a0fd7SJoe Perches void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, 5675c3a0fd7SJoe Perches u32 info, u8 *payload); 5685c3a0fd7SJoe Perches void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, 5691da177e4SLinus Torvalds u32 info); 5701da177e4SLinus Torvalds 5715961de9fSTom Herbert static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb) 5725961de9fSTom Herbert { 5735961de9fSTom Herbert ip_cmsg_recv_offset(msg, skb, 0); 5745961de9fSTom Herbert } 5755961de9fSTom Herbert 5764cdf507dSEric Dumazet bool icmp_global_allow(void); 5774cdf507dSEric Dumazet extern int sysctl_icmp_msgs_per_sec; 5784cdf507dSEric Dumazet extern int sysctl_icmp_msgs_burst; 5794cdf507dSEric Dumazet 58020380731SArnaldo Carvalho de Melo #ifdef CONFIG_PROC_FS 5815c3a0fd7SJoe Perches int ip_misc_proc_init(void); 58220380731SArnaldo Carvalho de Melo #endif 58320380731SArnaldo Carvalho de Melo 5841da177e4SLinus Torvalds #endif /* _IP_H */ 585