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#include <linux/types.h>#include <linux/ip.h>#include <linux/in.h>#include <linux/skbuff.h>#include <linux/jhash.h>#include <linux/sockptr.h>#include <linux/static_key.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>#include <net/lwtunnel.h>#include <net/inet_dscp.h>
#define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */#define IPV4_MIN_MTU 68 /* RFC 791 */
extern unsigned int sysctl_fib_sync_mem;extern unsigned int sysctl_fib_sync_mem_min;extern unsigned int sysctl_fib_sync_mem_max;
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)#define IPSKB_NOPOLICY BIT(8)#define IPSKB_MULTIPATH BIT(9)#define IPSKB_MCROUTE BIT(10)
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;}
static inline int ip_check_csum_start(const struct sk_buff *skb){ if (unlikely(skb->csum_start < skb->network_header + ip_hdrlen(skb))) return -EINVAL; return 0;}
struct ipcm_cookie { struct sockcm_cookie sockc; __be32 addr; int oif; struct ip_options_rcu *opt; __u8 protocol; __u8 ttl; __s16 tos; __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 = (struct ipcm_cookie) { .tos = READ_ONCE(inet->tos), };
sockcm_init(&ipcm->sockc, &inet->sk);
ipcm->oif = READ_ONCE(inet->sk.sk_bound_dev_if); ipcm->addr = inet->inet_saddr; ipcm->protocol = READ_ONCE(inet->inet_num);}
#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(const 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, u8 tos);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_mr_output(struct net *net, struct sock *sk, 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 *));
struct ip_fraglist_iter { struct sk_buff *frag; struct iphdr *iph; int offset; unsigned int hlen;};
void ip_fraglist_init(struct sk_buff *skb, struct iphdr *iph, unsigned int hlen, struct ip_fraglist_iter *iter);void ip_fraglist_prepare(struct sk_buff *skb, struct ip_fraglist_iter *iter);
static inline struct sk_buff *ip_fraglist_next(struct ip_fraglist_iter *iter){ struct sk_buff *skb = iter->frag;
iter->frag = skb->next; skb_mark_not_on_list(skb);
return skb;}
struct ip_frag_state { bool DF; unsigned int hlen; unsigned int ll_rs; unsigned int mtu; unsigned int left; int offset; int ptr; __be16 not_last_frag;};
void ip_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int ll_rs, unsigned int mtu, bool DF, struct ip_frag_state *state);struct sk_buff *ip_frag_next(struct sk_buff *skb, struct ip_frag_state *state);
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);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);
int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
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);}
/* Get the route scope that should be used when sending a packet. */static inline u8 ip_sendmsg_scope(const struct inet_sock *inet, const struct ipcm_cookie *ipc, const struct msghdr *msg){ if (sock_flag(&inet->sk, SOCK_LOCALROUTE) || msg->msg_flags & MSG_DONTROUTE || (ipc->opt && ipc->opt->opt.is_strictroute)) return RT_SCOPE_LINK;
return RT_SCOPE_UNIVERSE;}
/* datagram.c */int __ip4_datagram_connect(struct sock *sk, struct sockaddr_unsized *uaddr, int addr_len);int ip4_datagram_connect(struct sock *sk, struct sockaddr_unsized *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, const struct sock *orig_sk, struct sk_buff *skb, const struct ip_options *sopt, __be32 daddr, __be32 saddr, const struct ip_reply_arg *arg, unsigned int len, u64 transmit_time, u32 txhash);
#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)
static inline u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt){ return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);}
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_cnt(buff64, stats_list, cnt, \ mib_statistic, offset) \{ \ int i, c; \ for_each_possible_cpu(c) { \ for (i = 0; i < cnt; i++) \ buff64[i] += snmp_get_cpu_field64( \ mib_statistic, \ c, stats_list[i].entry, \ offset); \ } \}
#define snmp_get_cpu_field_batch_cnt(buff, stats_list, cnt, mib_statistic) \{ \ int i, c; \ for_each_possible_cpu(c) { \ for (i = 0; i < cnt; i++) \ buff[i] += snmp_get_cpu_field( \ mib_statistic, \ c, stats_list[i].entry); \ } \}
static inline void inet_get_local_port_range(const struct net *net, int *low, int *high){ u32 range = READ_ONCE(net->ipv4.ip_local_ports.range);
*low = range & 0xffff; *high = range >> 16;}bool inet_sk_get_local_port_range(const struct sock *sk, int *low, int *high);
#ifdef CONFIG_SYSCTLstatic inline bool inet_is_local_reserved_port(const struct net *net, unsigned short port){ if (!net->ipv4.sysctl_local_reserved_ports) return false; 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 bool inet_port_requires_bind_service(struct net *net, unsigned short port){ return port < READ_ONCE(net->ipv4.sysctl_ip_prot_sock);}
#elsestatic inline bool inet_is_local_reserved_port(struct net *net, unsigned short port){ return false;}
static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port){ return port < 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) \ (READ_ONCE((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 dscp_t ip4h_dscp(const struct iphdr *ip4h){ return inet_dsfield_to_dscp(ip4h->tos);}
static inline int ip_mtu_locked(const struct dst_entry *dst){ const struct rtable *rt = dst_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){ u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
return pmtudisc != IP_PMTUDISC_INTERFACE && pmtudisc != IP_PMTUDISC_OMIT;}
static inline bool ip_sk_use_pmtu(const struct sock *sk){ return READ_ONCE(inet_sk(sk)->pmtudisc) < IP_PMTUDISC_PROBE;}
static inline bool ip_sk_ignore_df(const struct sock *sk){ u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
return pmtudisc < IP_PMTUDISC_DO || pmtudisc == IP_PMTUDISC_OMIT;}
static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst, bool forwarding){ const struct rtable *rt = dst_rtable(dst); const struct net_device *dev; unsigned int mtu, res; struct net *net;
rcu_read_lock();
dev = dst_dev_rcu(dst); net = dev_net_rcu(dev); if (READ_ONCE(net->ipv4.sysctl_ip_fwd_use_pmtu) || ip_mtu_locked(dst) || !forwarding) { mtu = rt->rt_pmtu; if (mtu && time_before(jiffies, READ_ONCE(rt->dst.expires))) goto out; }
/* 'forwarding = true' case should always honour route mtu */ mtu = dst_metric_raw(dst, RTAX_MTU); if (mtu) goto out;
mtu = READ_ONCE(dev->mtu);
if (unlikely(ip_mtu_locked(dst))) { if (rt->rt_uses_gateway && mtu > 576) mtu = 576; }
out: mtu = min_t(unsigned int, mtu, IP_MAX_MTU);
res = mtu - lwtunnel_headroom(dst->lwtstate, mtu);
rcu_read_unlock();
return res;}
/* Configured/administrative MTU of a route, for advertising the TCP MSS. * * Unlike ip_dst_mtu_maybe_forward(), this deliberately ignores the * ICMP-learned path MTU (rt->rt_pmtu). The advertised MSS bounds what the * peer may send to us and must reflect our receive capability (the device or * route-configured MTU), not a path MTU learned on the reverse (send) * direction, which may not apply to the peer->us path and outlives the fnhe * for the whole connection. See RFC 2923 section 2.3 and the comment above * tcp_advertise_mss(). */static inline unsigned int ip_dst_mtu_configured(const struct dst_entry *dst){ unsigned int mtu, res;
rcu_read_lock(); mtu = dst_metric_raw(dst, RTAX_MTU); if (!mtu) mtu = READ_ONCE(dst_dev_rcu(dst)->mtu); mtu = min_t(unsigned int, mtu, IP_MAX_MTU); res = mtu - lwtunnel_headroom(dst->lwtstate, mtu); rcu_read_unlock();
return res;}
static inline unsigned int ip_skb_dst_mtu(struct sock *sk, const struct sk_buff *skb){ const struct dst_entry *dst = skb_dst(skb); unsigned int mtu;
if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) { bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
return ip_dst_mtu_maybe_forward(dst, forwarding); }
mtu = min(READ_ONCE(dst_dev(dst)->mtu), IP_MAX_MTU); return mtu - lwtunnel_headroom(dst->lwtstate, mtu);}
struct dst_metrics *ip_fib_metrics_init(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);}
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);
/* We had many attacks based on IPID, use the private * generator as much as we can. */ if (sk && inet_sk(sk)->inet_daddr) { int val;
/* avoid atomic operations for TCP, * as we hold socket lock at this point. */ if (sk_is_tcp(sk)) { sock_owned_by_me(sk); val = atomic_read(&inet_sk(sk)->inet_id); atomic_set(&inet_sk(sk)->inet_id, val + segs); } else { val = atomic_add_return(segs, &inet_sk(sk)->inet_id); } iph->id = htons(val); return; } if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { iph->id = 0; } else { /* Unfortunately we need the big hammer to get a suitable IPID */ __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) + sizeof(flow->addrs.v4addrs.src)); memcpy(&flow->addrs.v4addrs, &iph->addrs, sizeof(flow->addrs.v4addrs)); flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;}
/* * Map a multicast IP onto multicast MAC for type ethernet. */
static inline void ip_eth_mc_map(__be32 naddr, char *buf){ __u32 addr=ntohl(naddr); buf[0]=0x01; buf[1]=0x00; buf[2]=0x5e; buf[5]=addr&0xFF; addr>>=8; buf[4]=addr&0xFF; addr>>=8; buf[3]=addr&0x7F;}
/* * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand. * Leave P_Key as 0 to be filled in by driver. */
static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf){ __u32 addr; unsigned char scope = broadcast[5] & 0xF;
buf[0] = 0; /* Reserved */ buf[1] = 0xff; /* Multicast QPN */ buf[2] = 0xff; buf[3] = 0xff; addr = ntohl(naddr); buf[4] = 0xff; buf[5] = 0x10 | scope; /* scope from broadcast address */ buf[6] = 0x40; /* IPv4 signature */ buf[7] = 0x1b; buf[8] = broadcast[8]; /* P_Key */ buf[9] = broadcast[9]; buf[10] = 0; buf[11] = 0; buf[12] = 0; buf[13] = 0; buf[14] = 0; buf[15] = 0; buf[19] = addr & 0xff; addr >>= 8; buf[18] = addr & 0xff; addr >>= 8; buf[17] = addr & 0xff; addr >>= 8; buf[16] = addr & 0x0f;}
static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf){ if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0) memcpy(buf, broadcast, 4); else memcpy(buf, &naddr, sizeof(naddr));}
#if IS_ENABLED(CONFIG_IPV6)#include <linux/ipv6.h>#endif
static __inline__ void inet_reset_saddr(struct sock *sk){ inet_sk(sk)->inet_saddr = 0; WRITE_ONCE(inet_sk(sk)->inet_rcv_saddr, 0);#if IS_ENABLED(CONFIG_IPV6) if (sk->sk_family == PF_INET6) { struct ipv6_pinfo *np = inet6_sk(sk);
memset(&np->saddr, 0, sizeof(np->saddr)); memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); }#endif}
#endif
static inline unsigned int ipv4_addr_hash(__be32 ip){ return (__force unsigned int) ip;}
static inline u32 __ipv4_addr_hash(const __be32 ip, const u32 initval){ return jhash_1word((__force u32)ip, initval);}
static inline u32 ipv4_portaddr_hash(const struct net *net, __be32 saddr, unsigned int port){ return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;}
bool ip_call_ra_chain(struct sk_buff *skb);
/* * Functions provided by ip_fragment.c */
enum ip_defrag_users { IP_DEFRAG_LOCAL_DELIVER, IP_DEFRAG_CALL_RA_CHAIN, IP_DEFRAG_CONNTRACK_IN, __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX, IP_DEFRAG_CONNTRACK_OUT, __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX, IP_DEFRAG_CONNTRACK_BRIDGE_IN, __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX, IP_DEFRAG_VS_IN, IP_DEFRAG_VS_OUT, IP_DEFRAG_VS_FWD, IP_DEFRAG_AF_PACKET, IP_DEFRAG_MACVLAN,};
/* Return true if the value of 'user' is between 'lower_bond' * and 'upper_bond' inclusively. */static inline bool ip_defrag_user_in_between(u32 user, enum ip_defrag_users lower_bond, enum ip_defrag_users upper_bond){ return user >= lower_bond && user <= upper_bond;}
int ip_defrag(struct net *net, struct sk_buff *skb, u32 user);#ifdef CONFIG_INETstruct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user);#elsestatic inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user){ return skb;}#endif
/* * Functions provided by ip_forward.c */
int ip_forward(struct sk_buff *skb);
/* * Functions provided by ip_options.c */
void ip_options_build(struct sk_buff *skb, struct ip_options *opt, __be32 daddr, struct rtable *rt);
int __ip_options_echo(struct net *net, struct ip_options *dopt, struct sk_buff *skb, const struct ip_options *sopt);static inline int ip_options_echo(struct net *net, struct ip_options *dopt, struct sk_buff *skb){ return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt);}
void ip_options_fragment(struct sk_buff *skb);int __ip_options_compile(struct net *net, struct ip_options *opt, struct sk_buff *skb, __be32 *info);int ip_options_compile(struct net *net, struct ip_options *opt, struct sk_buff *skb);int ip_options_get(struct net *net, struct ip_options_rcu **optp, sockptr_t data, int optlen);void ip_options_undo(struct ip_options *opt);void ip_forward_options(struct sk_buff *skb);int ip_options_rcv_srr(struct sk_buff *skb, struct net_device *dev);
/* * Functions provided by ip_sockglue.c */
void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb, bool drop_dst);void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk, struct sk_buff *skb, int tlen, int offset);int ip_cmsg_send(struct sock *sk, struct msghdr *msg, struct ipcm_cookie *ipc, bool allow_ipv6);DECLARE_STATIC_KEY_FALSE(ip4_min_ttl);int do_ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen);int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen);int do_ip_getsockopt(struct sock *sk, int level, int optname, sockptr_t optval, sockptr_t optlen);int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen);int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *));
int ip_recv_error(struct sock *sk, struct msghdr *msg, int len);void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, u32 info, u8 *payload);void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport, u32 info);
static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb){ ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0);}
bool icmp_global_allow(struct net *net);void icmp_global_consume(struct net *net);
#ifdef CONFIG_PROC_FSint ip_misc_proc_init(void);#endif
int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family, struct netlink_ext_ack *extack);
static inline bool inetdev_valid_mtu(unsigned int mtu){ return likely(mtu >= IPV4_MIN_MTU);}
void ip_sock_set_freebind(struct sock *sk);int ip_sock_set_mtu_discover(struct sock *sk, int val);void ip_sock_set_pktinfo(struct sock *sk);void ip_sock_set_recverr(struct sock *sk);void ip_sock_set_tos(struct sock *sk, int val);void __ip_sock_set_tos(struct sock *sk, int val);
#endif /* _IP_H */