/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Definitions for the IP module. * * Version: @(#)ip.h 1.0.2 05/07/93 * * Authors: Ross Biro * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * Alan Cox, <gw4pts@gw4pts.ampr.org> * * Changes: * Mike McLagan : Routing by source * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */#ifndef _IP_H#define _IP_H #include <linux/types.h>#include <linux/ip.h>#include <linux/in.h>#include <linux/skbuff.h>#include <linux/jhash.h> #include <net/inet_sock.h>#include <net/route.h>#include <net/snmp.h>#include <net/flow.h>#include <net/flow_dissector.h>#include <net/netns/hash.h> #define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */#define IPV4_MIN_MTU 68 /* RFC 791 */ struct sock; struct inet_skb_parm { int iif; struct ip_options opt; /* Compiled IP options */ u16 flags; #define IPSKB_FORWARDED BIT(0)#define IPSKB_XFRM_TUNNEL_SIZE BIT(1)#define IPSKB_XFRM_TRANSFORMED BIT(2)#define IPSKB_FRAG_COMPLETE BIT(3)#define IPSKB_REROUTED BIT(4)#define IPSKB_DOREDIRECT BIT(5)#define IPSKB_FRAG_PMTU BIT(6)#define IPSKB_L3SLAVE BIT(7) u16 frag_max_size;}; static inline bool ipv4_l3mdev_skb(u16 flags){ return !!(flags & IPSKB_L3SLAVE);} static inline unsigned int ip_hdrlen(const struct sk_buff *skb){ return ip_hdr(skb)->ihl * 4;} struct ipcm_cookie { struct sockcm_cookie sockc; __be32 addr; int oif; struct ip_options_rcu *opt; __u8 ttl; __s16 tos; char priority; __u16 gso_size;}; static inline void ipcm_init(struct ipcm_cookie *ipcm){ *ipcm = (struct ipcm_cookie) { .tos = -1 };} static inline void ipcm_init_sk(struct ipcm_cookie *ipcm, const struct inet_sock *inet){ ipcm_init(ipcm); ipcm->sockc.tsflags = inet->sk.sk_tsflags; ipcm->oif = inet->sk.sk_bound_dev_if; ipcm->addr = inet->inet_saddr;} #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))#define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) /* return enslaved device index if relevant */static inline int inet_sdif(struct sk_buff *skb){#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags)) return IPCB(skb)->iif;#endif return 0;} /* Special input handler for packets caught by router alert option. They are selected only by protocol field, and then processed likely local ones; but only if someone wants them! Otherwise, router not running rsvpd will kill RSVP. It is user level problem, what it will make with them. I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), but receiver should be enough clever f.e. to forward mtrace requests, sent to multicast group to reach destination designated router. */ struct ip_ra_chain { struct ip_ra_chain __rcu *next; struct sock *sk; union { void (*destructor)(struct sock *); struct sock *saved_sk; }; struct rcu_head rcu;}; /* IP flags. */#define IP_CE 0x8000 /* Flag: "Congestion" */#define IP_DF 0x4000 /* Flag: "Don't Fragment" */#define IP_MF 0x2000 /* Flag: "More Fragments" */#define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ struct msghdr;struct net_device;struct packet_type;struct rtable;struct sockaddr; int igmp_mc_init(void); /* * Functions provided by ip.c */ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk, __be32 saddr, __be32 daddr, struct ip_options_rcu *opt);int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev);void ip_list_rcv(struct list_head *head, struct packet_type *pt, struct net_device *orig_dev);int ip_local_deliver(struct sk_buff *skb);void ip_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int proto);int ip_mr_input(struct sk_buff *skb);int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb);int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb);int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, int (*output)(struct net *, struct sock *, struct sk_buff *));void ip_send_check(struct iphdr *ip);int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, __u8 tos);void ip_init(void);int ip_append_data(struct sock *sk, struct flowi4 *fl4, int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, int len, int protolen, struct ipcm_cookie *ipc, struct rtable **rt, unsigned int flags);int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb);ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, int offset, size_t size, int flags);struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, struct sk_buff_head *queue, struct inet_cork *cork);int ip_send_skb(struct net *net, struct sk_buff *skb);int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);void ip_flush_pending_frames(struct sock *sk);struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, int length, int transhdrlen, struct ipcm_cookie *ipc, struct rtable **rtp, struct inet_cork *cork, unsigned int flags); static inline int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl){ return __ip_queue_xmit(sk, skb, fl, inet_sk(sk)->tos);} static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4){ return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);} static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet){ return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);} static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk){ return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);} /* datagram.c */int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); void ip4_datagram_release_cb(struct sock *sk); struct ip_reply_arg { struct kvec iov[1]; int flags; __wsum csum; int csumoffset; /* u16 offset of csum in iov[0].iov_base */ /* -1 if not needed */ int bound_dev_if; u8 tos; kuid_t uid;}; #define IP_REPLY_ARG_NOSRCCHECK 1 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg){ return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;} void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, const struct ip_options *sopt, __be32 daddr, __be32 saddr, const struct ip_reply_arg *arg, unsigned int len); #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)#define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field)#define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)#define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)#define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)#define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)#define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)#define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field)#define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)#define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);unsigned long snmp_fold_field(void __percpu *mib, int offt);#if BITS_PER_LONG==32u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, size_t syncp_offset);u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);#elsestatic inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, size_t syncp_offset){ return snmp_get_cpu_field(mib, cpu, offct); } static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off){ return snmp_fold_field(mib, offt);}#endif #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \{ \ int i, c; \ for_each_possible_cpu(c) { \ for (i = 0; stats_list[i].name; i++) \ buff64[i] += snmp_get_cpu_field64( \ mib_statistic, \ c, stats_list[i].entry, \ offset); \ } \} #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \{ \ int i, c; \ for_each_possible_cpu(c) { \ for (i = 0; stats_list[i].name; i++) \ buff[i] += snmp_get_cpu_field( \ mib_statistic, \ c, stats_list[i].entry); \ } \} void inet_get_local_port_range(struct net *net, int *low, int *high); #ifdef CONFIG_SYSCTLstatic inline int inet_is_local_reserved_port(struct net *net, int port){ if (!net->ipv4.sysctl_local_reserved_ports) return 0; return test_bit(port, net->ipv4.sysctl_local_reserved_ports);} static inline bool sysctl_dev_name_is_allowed(const char *name){ return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;} static inline int inet_prot_sock(struct net *net){ return net->ipv4.sysctl_ip_prot_sock;} #elsestatic inline int inet_is_local_reserved_port(struct net *net, int port){ return 0;} static inline int inet_prot_sock(struct net *net){ return PROT_SOCK;}#endif __be32 inet_current_timestamp(void); /* From inetpeer.c */extern int inet_peer_threshold;extern int inet_peer_minttl;extern int inet_peer_maxttl; void ipfrag_init(void); void ip_static_sysctl_init(void); #define IP4_REPLY_MARK(net, mark) \ ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) static inline bool ip_is_fragment(const struct iphdr *iph){ return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;} #ifdef CONFIG_INET#include <net/dst.h> /* The function in 2.2 was invalid, producing wrong result for * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */static inlineint ip_decrease_ttl(struct iphdr *iph){ u32 check = (__force u32)iph->check; check += (__force u32)htons(0x0100); iph->check = (__force __sum16)(check + (check>=0xFFFF)); return --iph->ttl;} static inline int ip_mtu_locked(const struct dst_entry *dst){ const struct rtable *rt = (const struct rtable *)dst; return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU);} static inlineint ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst){ u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); return pmtudisc == IP_PMTUDISC_DO || (pmtudisc == IP_PMTUDISC_WANT && !ip_mtu_locked(dst));} static inline bool ip_sk_accept_pmtu(const struct sock *sk){ return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;} static inline bool ip_sk_use_pmtu(const struct sock *sk){ return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;} static inline bool ip_sk_ignore_df(const struct sock *sk){ return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;} static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, bool forwarding){ struct net *net = dev_net(dst->dev); if (net->ipv4.sysctl_ip_fwd_use_pmtu || ip_mtu_locked(dst) || !forwarding) return dst_mtu(dst); return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU);} static inline unsigned int ip_skb_dst_mtu(struct sock *sk, const struct sk_buff *skb){ if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); } return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);} struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx, int fc_mx_len, struct netlink_ext_ack *extack);static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics){ if (fib_metrics != &dst_default_metrics && refcount_dec_and_test(&fib_metrics->refcnt)) kfree(fib_metrics);} /* ipv4 and ipv6 both use refcounted metrics if it is not the default */static inlinevoid ip_dst_init_metrics(struct dst_entry *dst, struct dst_metrics *fib_metrics){ dst_init_metrics(dst, fib_metrics->metrics, true); if (fib_metrics != &dst_default_metrics) { dst->_metrics |= DST_METRICS_REFCOUNTED; refcount_inc(&fib_metrics->refcnt); }} static inlinevoid ip_dst_metrics_put(struct dst_entry *dst){ struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst); if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt)) kfree(p);} u32 ip_idents_reserve(u32 hash, int segs);void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, struct sock *sk, int segs){ struct iphdr *iph = ip_hdr(skb); if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { /* This is only to work around buggy Windows95/2000 * VJ compression implementations. If the ID field * does not change, they drop every other packet in * a TCP stream using header compression. */ if (sk && inet_sk(sk)->inet_daddr) { iph->id = htons(inet_sk(sk)->inet_id); inet_sk(sk)->inet_id += segs; } else { iph->id = 0; } } else { __ip_select_ident(net, iph, segs); }} static inline void ip_select_ident(struct net *net, struct sk_buff *skb, struct sock *sk){ ip_select_ident_segs(net, skb, sk, 1);} static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto){ return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, skb->len, proto, 0);} /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store * Equivalent to : flow->v4addrs.src = iph->saddr; * flow->v4addrs.dst = iph->daddr; */static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, const struct iphdr *iph){ BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != offsetof(typeof(flow->addrs), v4addrs.src) +Lines 1–500 of 724. Load more
/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Definitions for the IP module. * * Version: @(#)ip.h 1.0.2 05/07/93 * * Authors: Ross Biro * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> * Alan Cox, <gw4pts@gw4pts.ampr.org> * * Changes: * Mike McLagan : Routing by source * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _IP_H #define _IP_H #include <linux/types.h> #include <linux/ip.h> #include <linux/in.h> #include <linux/skbuff.h> #include <linux/jhash.h> #include <net/inet_sock.h> #include <net/route.h> #include <net/snmp.h> #include <net/flow.h> #include <net/flow_dissector.h> #include <net/netns/hash.h> #define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */ #define IPV4_MIN_MTU 68 /* RFC 791 */ struct sock; struct inet_skb_parm { int iif; struct ip_options opt; /* Compiled IP options */ u16 flags; #define IPSKB_FORWARDED BIT(0) #define IPSKB_XFRM_TUNNEL_SIZE BIT(1) #define IPSKB_XFRM_TRANSFORMED BIT(2) #define IPSKB_FRAG_COMPLETE BIT(3) #define IPSKB_REROUTED BIT(4) #define IPSKB_DOREDIRECT BIT(5) #define IPSKB_FRAG_PMTU BIT(6) #define IPSKB_L3SLAVE BIT(7) u16 frag_max_size; }; static inline bool ipv4_l3mdev_skb(u16 flags) { return !!(flags & IPSKB_L3SLAVE); } static inline unsigned int ip_hdrlen(const struct sk_buff *skb) { return ip_hdr(skb)->ihl * 4; } struct ipcm_cookie { struct sockcm_cookie sockc; __be32 addr; int oif; struct ip_options_rcu *opt; __u8 ttl; __s16 tos; char priority; __u16 gso_size; }; static inline void ipcm_init(struct ipcm_cookie *ipcm) { *ipcm = (struct ipcm_cookie) { .tos = -1 }; } static inline void ipcm_init_sk(struct ipcm_cookie *ipcm, const struct inet_sock *inet) { ipcm_init(ipcm); ipcm->sockc.tsflags = inet->sk.sk_tsflags; ipcm->oif = inet->sk.sk_bound_dev_if; ipcm->addr = inet->inet_saddr; } #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb)) #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb)) /* return enslaved device index if relevant */ static inline int inet_sdif(struct sk_buff *skb) { #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags)) return IPCB(skb)->iif; #endif return 0; } /* Special input handler for packets caught by router alert option. They are selected only by protocol field, and then processed likely local ones; but only if someone wants them! Otherwise, router not running rsvpd will kill RSVP. It is user level problem, what it will make with them. I have no idea, how it will masquearde or NAT them (it is joke, joke :-)), but receiver should be enough clever f.e. to forward mtrace requests, sent to multicast group to reach destination designated router. */ struct ip_ra_chain { struct ip_ra_chain __rcu *next; struct sock *sk; union { void (*destructor)(struct sock *); struct sock *saved_sk; }; struct rcu_head rcu; }; /* IP flags. */ #define IP_CE 0x8000 /* Flag: "Congestion" */ #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ #define IP_MF 0x2000 /* Flag: "More Fragments" */ #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */ struct msghdr; struct net_device; struct packet_type; struct rtable; struct sockaddr; int igmp_mc_init(void); /* * Functions provided by ip.c */ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk, __be32 saddr, __be32 daddr, struct ip_options_rcu *opt); int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev); void ip_list_rcv(struct list_head *head, struct packet_type *pt, struct net_device *orig_dev); int ip_local_deliver(struct sk_buff *skb); void ip_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int proto); int ip_mr_input(struct sk_buff *skb); int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb); int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb); int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb, int (*output)(struct net *, struct sock *, struct sk_buff *)); void ip_send_check(struct iphdr *ip); int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb); int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, __u8 tos); void ip_init(void); int ip_append_data(struct sock *sk, struct flowi4 *fl4, int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, int len, int protolen, struct ipcm_cookie *ipc, struct rtable **rt, unsigned int flags); int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb); ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page, int offset, size_t size, int flags); struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4, struct sk_buff_head *queue, struct inet_cork *cork); int ip_send_skb(struct net *net, struct sk_buff *skb); int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); void ip_flush_pending_frames(struct sock *sk); struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4, int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), void *from, int length, int transhdrlen, struct ipcm_cookie *ipc, struct rtable **rtp, struct inet_cork *cork, unsigned int flags); static inline int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl) { return __ip_queue_xmit(sk, skb, fl, inet_sk(sk)->tos); } static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4) { return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base); } static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet) { return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos); } static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk) { return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk); } /* datagram.c */ int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); void ip4_datagram_release_cb(struct sock *sk); struct ip_reply_arg { struct kvec iov[1]; int flags; __wsum csum; int csumoffset; /* u16 offset of csum in iov[0].iov_base */ /* -1 if not needed */ int bound_dev_if; u8 tos; kuid_t uid; }; #define IP_REPLY_ARG_NOSRCCHECK 1 static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg) { return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0; } void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb, const struct ip_options *sopt, __be32 daddr, __be32 saddr, const struct ip_reply_arg *arg, unsigned int len); #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field) #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field) #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val) #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val) #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field) #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field) #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd) u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct); unsigned long snmp_fold_field(void __percpu *mib, int offt); #if BITS_PER_LONG==32 u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, size_t syncp_offset); u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off); #else static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct, size_t syncp_offset) { return snmp_get_cpu_field(mib, cpu, offct); } static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off) { return snmp_fold_field(mib, offt); } #endif #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \ { \ int i, c; \ for_each_possible_cpu(c) { \ for (i = 0; stats_list[i].name; i++) \ buff64[i] += snmp_get_cpu_field64( \ mib_statistic, \ c, stats_list[i].entry, \ offset); \ } \ } #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \ { \ int i, c; \ for_each_possible_cpu(c) { \ for (i = 0; stats_list[i].name; i++) \ buff[i] += snmp_get_cpu_field( \ mib_statistic, \ c, stats_list[i].entry); \ } \ } void inet_get_local_port_range(struct net *net, int *low, int *high); #ifdef CONFIG_SYSCTL static inline int inet_is_local_reserved_port(struct net *net, int port) { if (!net->ipv4.sysctl_local_reserved_ports) return 0; return test_bit(port, net->ipv4.sysctl_local_reserved_ports); } static inline bool sysctl_dev_name_is_allowed(const char *name) { return strcmp(name, "default") != 0 && strcmp(name, "all") != 0; } static inline int inet_prot_sock(struct net *net) { return net->ipv4.sysctl_ip_prot_sock; } #else static inline int inet_is_local_reserved_port(struct net *net, int port) { return 0; } static inline int inet_prot_sock(struct net *net) { return PROT_SOCK; } #endif __be32 inet_current_timestamp(void); /* From inetpeer.c */ extern int inet_peer_threshold; extern int inet_peer_minttl; extern int inet_peer_maxttl; void ipfrag_init(void); void ip_static_sysctl_init(void); #define IP4_REPLY_MARK(net, mark) \ ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0) static inline bool ip_is_fragment(const struct iphdr *iph) { return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0; } #ifdef CONFIG_INET #include <net/dst.h> /* The function in 2.2 was invalid, producing wrong result for * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */ static inline int ip_decrease_ttl(struct iphdr *iph) { u32 check = (__force u32)iph->check; check += (__force u32)htons(0x0100); iph->check = (__force __sum16)(check + (check>=0xFFFF)); return --iph->ttl; } static inline int ip_mtu_locked(const struct dst_entry *dst) { const struct rtable *rt = (const struct rtable *)dst; return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU); } static inline int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst) { u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc); return pmtudisc == IP_PMTUDISC_DO || (pmtudisc == IP_PMTUDISC_WANT && !ip_mtu_locked(dst)); } static inline bool ip_sk_accept_pmtu(const struct sock *sk) { return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE && inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT; } static inline bool ip_sk_use_pmtu(const struct sock *sk) { return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE; } static inline bool ip_sk_ignore_df(const struct sock *sk) { return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO || inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT; } static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, bool forwarding) { struct net *net = dev_net(dst->dev); if (net->ipv4.sysctl_ip_fwd_use_pmtu || ip_mtu_locked(dst) || !forwarding) return dst_mtu(dst); return min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU); } static inline unsigned int ip_skb_dst_mtu(struct sock *sk, const struct sk_buff *skb) { if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED; return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding); } return min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU); } struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx, int fc_mx_len, struct netlink_ext_ack *extack); static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics) { if (fib_metrics != &dst_default_metrics && refcount_dec_and_test(&fib_metrics->refcnt)) kfree(fib_metrics); } /* ipv4 and ipv6 both use refcounted metrics if it is not the default */ static inline void ip_dst_init_metrics(struct dst_entry *dst, struct dst_metrics *fib_metrics) { dst_init_metrics(dst, fib_metrics->metrics, true); if (fib_metrics != &dst_default_metrics) { dst->_metrics |= DST_METRICS_REFCOUNTED; refcount_inc(&fib_metrics->refcnt); } } static inline void ip_dst_metrics_put(struct dst_entry *dst) { struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst); if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt)) kfree(p); } u32 ip_idents_reserve(u32 hash, int segs); void __ip_select_ident(struct net *net, struct iphdr *iph, int segs); static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, struct sock *sk, int segs) { struct iphdr *iph = ip_hdr(skb); if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { /* This is only to work around buggy Windows95/2000 * VJ compression implementations. If the ID field * does not change, they drop every other packet in * a TCP stream using header compression. */ if (sk && inet_sk(sk)->inet_daddr) { iph->id = htons(inet_sk(sk)->inet_id); inet_sk(sk)->inet_id += segs; } else { iph->id = 0; } } else { __ip_select_ident(net, iph, segs); } } static inline void ip_select_ident(struct net *net, struct sk_buff *skb, struct sock *sk) { ip_select_ident_segs(net, skb, sk, 1); } static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto) { return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr, skb->len, proto, 0); } /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store * Equivalent to : flow->v4addrs.src = iph->saddr; * flow->v4addrs.dst = iph->daddr; */ static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow, const struct iphdr *iph) { BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) != offsetof(typeof(flow->addrs), v4addrs.src) +