^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * INET An implementation of the TCP/IP protocol suite for the LINUX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * operating system. INET is implemented using the BSD Socket
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * interface as the means of communication with the user level.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Definitions for the IP module.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Version: @(#)ip.h 1.0.2 05/07/93
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Authors: Ross Biro
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Alan Cox, <gw4pts@gw4pts.ampr.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * Changes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * Mike McLagan : Routing by source
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #ifndef _IP_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #define _IP_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/types.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include <linux/in.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) #include <linux/jhash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #include <linux/sockptr.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #include <net/inet_sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) #include <net/route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #include <net/snmp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <net/flow.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <net/flow_dissector.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <net/netns/hash.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #ifndef __GENKSYMS__
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <net/lwtunnel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #define IPV4_MAX_PMTU 65535U /* RFC 2675, Section 5.1 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #define IPV4_MIN_MTU 68 /* RFC 791 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) extern unsigned int sysctl_fib_sync_mem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) extern unsigned int sysctl_fib_sync_mem_min;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) extern unsigned int sysctl_fib_sync_mem_max;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) struct sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct inet_skb_parm {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) int iif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) struct ip_options opt; /* Compiled IP options */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) u16 flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #define IPSKB_FORWARDED BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) #define IPSKB_XFRM_TUNNEL_SIZE BIT(1)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) #define IPSKB_XFRM_TRANSFORMED BIT(2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) #define IPSKB_FRAG_COMPLETE BIT(3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) #define IPSKB_REROUTED BIT(4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) #define IPSKB_DOREDIRECT BIT(5)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) #define IPSKB_FRAG_PMTU BIT(6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) #define IPSKB_L3SLAVE BIT(7)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) u16 frag_max_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) static inline bool ipv4_l3mdev_skb(u16 flags)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) return !!(flags & IPSKB_L3SLAVE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) static inline unsigned int ip_hdrlen(const struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) return ip_hdr(skb)->ihl * 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct ipcm_cookie {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) struct sockcm_cookie sockc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) __be32 addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) int oif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) struct ip_options_rcu *opt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) __u8 ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) __s16 tos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) char priority;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) __u16 gso_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) static inline void ipcm_init(struct ipcm_cookie *ipcm)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) *ipcm = (struct ipcm_cookie) { .tos = -1 };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) static inline void ipcm_init_sk(struct ipcm_cookie *ipcm,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) const struct inet_sock *inet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) ipcm_init(ipcm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) ipcm->sockc.mark = inet->sk.sk_mark;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) ipcm->sockc.tsflags = inet->sk.sk_tsflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) ipcm->oif = inet->sk.sk_bound_dev_if;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) ipcm->addr = inet->inet_saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) /* return enslaved device index if relevant */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) static inline int inet_sdif(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) return IPCB(skb)->iif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) /* Special input handler for packets caught by router alert option.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) They are selected only by protocol field, and then processed likely
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) local ones; but only if someone wants them! Otherwise, router
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) not running rsvpd will kill RSVP.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) It is user level problem, what it will make with them.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) but receiver should be enough clever f.e. to forward mtrace requests,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) sent to multicast group to reach destination designated router.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) struct ip_ra_chain {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) struct ip_ra_chain __rcu *next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) struct sock *sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) void (*destructor)(struct sock *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct sock *saved_sk;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) struct rcu_head rcu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) /* IP flags. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) #define IP_CE 0x8000 /* Flag: "Congestion" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) #define IP_DF 0x4000 /* Flag: "Don't Fragment" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) #define IP_MF 0x2000 /* Flag: "More Fragments" */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) #define IP_FRAG_TIME (30 * HZ) /* fragment lifetime */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) struct msghdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) struct net_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) struct packet_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) struct rtable;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) struct sockaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) int igmp_mc_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) * Functions provided by ip.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) __be32 saddr, __be32 daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) struct ip_options_rcu *opt, u8 tos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) struct net_device *orig_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) void ip_list_rcv(struct list_head *head, struct packet_type *pt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) struct net_device *orig_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) int ip_local_deliver(struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) void ip_protocol_deliver_rcu(struct net *net, struct sk_buff *skb, int proto);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) int ip_mr_input(struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) int (*output)(struct net *, struct sock *, struct sk_buff *));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) struct ip_fraglist_iter {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) struct sk_buff *frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) struct iphdr *iph;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) int offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) unsigned int hlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) void ip_fraglist_init(struct sk_buff *skb, struct iphdr *iph,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) unsigned int hlen, struct ip_fraglist_iter *iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) void ip_fraglist_prepare(struct sk_buff *skb, struct ip_fraglist_iter *iter);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static inline struct sk_buff *ip_fraglist_next(struct ip_fraglist_iter *iter)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) struct sk_buff *skb = iter->frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) iter->frag = skb->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) skb_mark_not_on_list(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) return skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) struct ip_frag_state {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) bool DF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) unsigned int hlen;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) unsigned int ll_rs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) unsigned int mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) unsigned int left;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) int offset;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) int ptr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) __be16 not_last_frag;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) void ip_frag_init(struct sk_buff *skb, unsigned int hlen, unsigned int ll_rs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) unsigned int mtu, bool DF, struct ip_frag_state *state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) struct sk_buff *ip_frag_next(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) struct ip_frag_state *state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) void ip_send_check(struct iphdr *ip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) int __ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) __u8 tos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) void ip_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) int ip_append_data(struct sock *sk, struct flowi4 *fl4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) int getfrag(void *from, char *to, int offset, int len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) int odd, struct sk_buff *skb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) void *from, int len, int protolen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) struct ipcm_cookie *ipc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) struct rtable **rt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) unsigned int flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) int ip_generic_getfrag(void *from, char *to, int offset, int len, int odd,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) ssize_t ip_append_page(struct sock *sk, struct flowi4 *fl4, struct page *page,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) int offset, size_t size, int flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) struct sk_buff *__ip_make_skb(struct sock *sk, struct flowi4 *fl4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) struct sk_buff_head *queue,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) struct inet_cork *cork);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) int ip_send_skb(struct net *net, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) void ip_flush_pending_frames(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) struct sk_buff *ip_make_skb(struct sock *sk, struct flowi4 *fl4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) int getfrag(void *from, char *to, int offset,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) int len, int odd, struct sk_buff *skb),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) void *from, int length, int transhdrlen,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) struct ipcm_cookie *ipc, struct rtable **rtp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) struct inet_cork *cork, unsigned int flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) static inline struct sk_buff *ip_finish_skb(struct sock *sk, struct flowi4 *fl4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) static inline __u8 get_rttos(struct ipcm_cookie* ipc, struct inet_sock *inet)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) return (ipc->tos != -1) ? RT_TOS(ipc->tos) : RT_TOS(inet->tos);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) static inline __u8 get_rtconn_flags(struct ipcm_cookie* ipc, struct sock* sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) return (ipc->tos != -1) ? RT_CONN_FLAGS_TOS(sk, ipc->tos) : RT_CONN_FLAGS(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) /* datagram.c */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) void ip4_datagram_release_cb(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) struct ip_reply_arg {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) struct kvec iov[1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) int flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) __wsum csum;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) int csumoffset; /* u16 offset of csum in iov[0].iov_base */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) /* -1 if not needed */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) int bound_dev_if;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) u8 tos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) kuid_t uid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) #define IP_REPLY_ARG_NOSRCCHECK 1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) static inline __u8 ip_reply_arg_flowi_flags(const struct ip_reply_arg *arg)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) void ip_send_unicast_reply(struct sock *sk, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) const struct ip_options *sopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) __be32 daddr, __be32 saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) const struct ip_reply_arg *arg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) unsigned int len, u64 transmit_time);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) #define IP_INC_STATS(net, field) SNMP_INC_STATS64((net)->mib.ip_statistics, field)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) #define __IP_INC_STATS(net, field) __SNMP_INC_STATS64((net)->mib.ip_statistics, field)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) #define IP_ADD_STATS(net, field, val) SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) #define NET_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.net_statistics, field)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) #define __NET_INC_STATS(net, field) __SNMP_INC_STATS((net)->mib.net_statistics, field)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) #define NET_ADD_STATS(net, field, adnd) SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offct);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) unsigned long snmp_fold_field(void __percpu *mib, int offt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) #if BITS_PER_LONG==32
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) size_t syncp_offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) u64 snmp_fold_field64(void __percpu *mib, int offt, size_t sync_off);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) static inline u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offct,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) size_t syncp_offset)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) return snmp_get_cpu_field(mib, cpu, offct);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) static inline u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_off)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) return snmp_fold_field(mib, offt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) #define snmp_get_cpu_field64_batch(buff64, stats_list, mib_statistic, offset) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) int i, c; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) for_each_possible_cpu(c) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) for (i = 0; stats_list[i].name; i++) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) buff64[i] += snmp_get_cpu_field64( \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) mib_statistic, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) c, stats_list[i].entry, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) offset); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) #define snmp_get_cpu_field_batch(buff, stats_list, mib_statistic) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) int i, c; \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) for_each_possible_cpu(c) { \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) for (i = 0; stats_list[i].name; i++) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) buff[i] += snmp_get_cpu_field( \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) mib_statistic, \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) c, stats_list[i].entry); \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) } \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) void inet_get_local_port_range(struct net *net, int *low, int *high);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) #ifdef CONFIG_SYSCTL
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) static inline bool inet_is_local_reserved_port(struct net *net, unsigned short port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) if (!net->ipv4.sysctl_local_reserved_ports)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) return test_bit(port, net->ipv4.sysctl_local_reserved_ports);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) static inline bool inet_is_local_unbindable_port(struct net *net, unsigned short port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) if (!net->ipv4.sysctl_local_unbindable_ports)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) return test_bit(port, net->ipv4.sysctl_local_unbindable_ports);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) static inline bool sysctl_dev_name_is_allowed(const char *name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) return strcmp(name, "default") != 0 && strcmp(name, "all") != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) return port < net->ipv4.sysctl_ip_prot_sock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) static inline bool inet_is_local_reserved_port(struct net *net, unsigned short port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) static inline bool inet_is_local_unbindable_port(struct net *net, unsigned short port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) return false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) static inline bool inet_port_requires_bind_service(struct net *net, unsigned short port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) return port < PROT_SOCK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) __be32 inet_current_timestamp(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) /* From inetpeer.c */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) extern int inet_peer_threshold;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) extern int inet_peer_minttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) extern int inet_peer_maxttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) void ipfrag_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) void ip_static_sysctl_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) #define IP4_REPLY_MARK(net, mark) \
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) ((net)->ipv4.sysctl_fwmark_reflect ? (mark) : 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) static inline bool ip_is_fragment(const struct iphdr *iph)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) #ifdef CONFIG_INET
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) #include <net/dst.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) /* The function in 2.2 was invalid, producing wrong result for
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) static inline
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) int ip_decrease_ttl(struct iphdr *iph)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) u32 check = (__force u32)iph->check;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) check += (__force u32)htons(0x0100);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) iph->check = (__force __sum16)(check + (check>=0xFFFF));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) return --iph->ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) static inline int ip_mtu_locked(const struct dst_entry *dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 417) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 418) const struct rtable *rt = (const struct rtable *)dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 419)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 420) return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 421) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 422)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 423) static inline
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 424) int ip_dont_fragment(const struct sock *sk, const struct dst_entry *dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 425) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 426) u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 427)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 428) return pmtudisc == IP_PMTUDISC_DO ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 429) (pmtudisc == IP_PMTUDISC_WANT &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 430) !ip_mtu_locked(dst));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 431) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 432)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 433) static inline bool ip_sk_accept_pmtu(const struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 434) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 435) return inet_sk(sk)->pmtudisc != IP_PMTUDISC_INTERFACE &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 436) inet_sk(sk)->pmtudisc != IP_PMTUDISC_OMIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 437) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 438)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 439) static inline bool ip_sk_use_pmtu(const struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 440) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 441) return inet_sk(sk)->pmtudisc < IP_PMTUDISC_PROBE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 442) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 443)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 444) static inline bool ip_sk_ignore_df(const struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 445) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 446) return inet_sk(sk)->pmtudisc < IP_PMTUDISC_DO ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 447) inet_sk(sk)->pmtudisc == IP_PMTUDISC_OMIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 448) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 449)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 450) static inline unsigned int ip_dst_mtu_maybe_forward(const struct dst_entry *dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 451) bool forwarding)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 452) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 453) struct net *net = dev_net(dst->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 454) unsigned int mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 455)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 456) if (net->ipv4.sysctl_ip_fwd_use_pmtu ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 457) ip_mtu_locked(dst) ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 458) !forwarding)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 459) return dst_mtu(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 460)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 461) /* 'forwarding = true' case should always honour route mtu */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 462) mtu = dst_metric_raw(dst, RTAX_MTU);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 463) if (!mtu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 464) mtu = min(READ_ONCE(dst->dev->mtu), IP_MAX_MTU);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 465)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 466) return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 467) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 468)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 469) static inline unsigned int ip_skb_dst_mtu(struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 470) const struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 471) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 472) unsigned int mtu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 473)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 474) if (!sk || !sk_fullsock(sk) || ip_sk_use_pmtu(sk)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 475) bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 476)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 477) return ip_dst_mtu_maybe_forward(skb_dst(skb), forwarding);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 478) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 479)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 480) mtu = min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 481) return mtu - lwtunnel_headroom(skb_dst(skb)->lwtstate, mtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 482) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 483)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 484) struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 485) int fc_mx_len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 486) struct netlink_ext_ack *extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 487) static inline void ip_fib_metrics_put(struct dst_metrics *fib_metrics)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 488) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 489) if (fib_metrics != &dst_default_metrics &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 490) refcount_dec_and_test(&fib_metrics->refcnt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 491) kfree(fib_metrics);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 492) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 493)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 494) /* ipv4 and ipv6 both use refcounted metrics if it is not the default */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 495) static inline
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 496) void ip_dst_init_metrics(struct dst_entry *dst, struct dst_metrics *fib_metrics)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 497) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 498) dst_init_metrics(dst, fib_metrics->metrics, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 499)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 500) if (fib_metrics != &dst_default_metrics) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 501) dst->_metrics |= DST_METRICS_REFCOUNTED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 502) refcount_inc(&fib_metrics->refcnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 503) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 504) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 505)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 506) static inline
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 507) void ip_dst_metrics_put(struct dst_entry *dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 508) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 509) struct dst_metrics *p = (struct dst_metrics *)DST_METRICS_PTR(dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 510)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 511) if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 512) kfree(p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 513) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 514)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 515) u32 ip_idents_reserve(u32 hash, int segs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 516) void __ip_select_ident(struct net *net, struct iphdr *iph, int segs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 517)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 518) static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 519) struct sock *sk, int segs)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 520) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 521) struct iphdr *iph = ip_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 522)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 523) /* We had many attacks based on IPID, use the private
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 524) * generator as much as we can.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 525) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 526) if (sk && inet_sk(sk)->inet_daddr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 527) iph->id = htons(inet_sk(sk)->inet_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 528) inet_sk(sk)->inet_id += segs;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 529) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 530) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 531) if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 532) iph->id = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 533) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 534) /* Unfortunately we need the big hammer to get a suitable IPID */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 535) __ip_select_ident(net, iph, segs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 536) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 537) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 538)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 539) static inline void ip_select_ident(struct net *net, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 540) struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 541) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 542) ip_select_ident_segs(net, skb, sk, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 543) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 544)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 545) static inline __wsum inet_compute_pseudo(struct sk_buff *skb, int proto)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 546) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 547) return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 548) skb->len, proto, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 549) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 550)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 551) /* copy IPv4 saddr & daddr to flow_keys, possibly using 64bit load/store
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 552) * Equivalent to : flow->v4addrs.src = iph->saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 553) * flow->v4addrs.dst = iph->daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 554) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 555) static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 556) const struct iphdr *iph)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 557) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 558) BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 559) offsetof(typeof(flow->addrs), v4addrs.src) +
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 560) sizeof(flow->addrs.v4addrs.src));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 561) memcpy(&flow->addrs.v4addrs, &iph->saddr, sizeof(flow->addrs.v4addrs));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 562) flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 563) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 564)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 565) static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 566) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 567) const struct iphdr *iph = skb_gro_network_header(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 568)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 569) return csum_tcpudp_nofold(iph->saddr, iph->daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 570) skb_gro_len(skb), proto, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 571) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 572)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 573) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 574) * Map a multicast IP onto multicast MAC for type ethernet.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 575) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 576)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 577) static inline void ip_eth_mc_map(__be32 naddr, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 578) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 579) __u32 addr=ntohl(naddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 580) buf[0]=0x01;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 581) buf[1]=0x00;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 582) buf[2]=0x5e;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 583) buf[5]=addr&0xFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 584) addr>>=8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 585) buf[4]=addr&0xFF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 586) addr>>=8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 587) buf[3]=addr&0x7F;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 588) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 589)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 590) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 591) * Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 592) * Leave P_Key as 0 to be filled in by driver.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 593) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 594)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 595) static inline void ip_ib_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 596) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 597) __u32 addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 598) unsigned char scope = broadcast[5] & 0xF;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 599)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 600) buf[0] = 0; /* Reserved */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 601) buf[1] = 0xff; /* Multicast QPN */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 602) buf[2] = 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 603) buf[3] = 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 604) addr = ntohl(naddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 605) buf[4] = 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 606) buf[5] = 0x10 | scope; /* scope from broadcast address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 607) buf[6] = 0x40; /* IPv4 signature */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 608) buf[7] = 0x1b;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 609) buf[8] = broadcast[8]; /* P_Key */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 610) buf[9] = broadcast[9];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 611) buf[10] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 612) buf[11] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 613) buf[12] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 614) buf[13] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 615) buf[14] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 616) buf[15] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 617) buf[19] = addr & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 618) addr >>= 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 619) buf[18] = addr & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 620) addr >>= 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 621) buf[17] = addr & 0xff;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 622) addr >>= 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 623) buf[16] = addr & 0x0f;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 624) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 625)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 626) static inline void ip_ipgre_mc_map(__be32 naddr, const unsigned char *broadcast, char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 627) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 628) if ((broadcast[0] | broadcast[1] | broadcast[2] | broadcast[3]) != 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 629) memcpy(buf, broadcast, 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 630) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 631) memcpy(buf, &naddr, sizeof(naddr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 632) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 633)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 634) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 635) #include <linux/ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 636) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 637)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 638) static __inline__ void inet_reset_saddr(struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 639) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 640) inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 641) #if IS_ENABLED(CONFIG_IPV6)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 642) if (sk->sk_family == PF_INET6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 643) struct ipv6_pinfo *np = inet6_sk(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 644)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 645) memset(&np->saddr, 0, sizeof(np->saddr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 646) memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 647) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 648) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 649) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 650)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 651) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 652)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 653) static inline unsigned int ipv4_addr_hash(__be32 ip)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 654) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 655) return (__force unsigned int) ip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 656) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 657)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 658) static inline u32 ipv4_portaddr_hash(const struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 659) __be32 saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 660) unsigned int port)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 661) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 662) return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 663) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 664)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 665) bool ip_call_ra_chain(struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 666)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 667) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 668) * Functions provided by ip_fragment.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 669) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 670)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 671) enum ip_defrag_users {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 672) IP_DEFRAG_LOCAL_DELIVER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 673) IP_DEFRAG_CALL_RA_CHAIN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 674) IP_DEFRAG_CONNTRACK_IN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 675) __IP_DEFRAG_CONNTRACK_IN_END = IP_DEFRAG_CONNTRACK_IN + USHRT_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 676) IP_DEFRAG_CONNTRACK_OUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 677) __IP_DEFRAG_CONNTRACK_OUT_END = IP_DEFRAG_CONNTRACK_OUT + USHRT_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 678) IP_DEFRAG_CONNTRACK_BRIDGE_IN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 679) __IP_DEFRAG_CONNTRACK_BRIDGE_IN = IP_DEFRAG_CONNTRACK_BRIDGE_IN + USHRT_MAX,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 680) IP_DEFRAG_VS_IN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 681) IP_DEFRAG_VS_OUT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 682) IP_DEFRAG_VS_FWD,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 683) IP_DEFRAG_AF_PACKET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 684) IP_DEFRAG_MACVLAN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 685) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 686)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 687) /* Return true if the value of 'user' is between 'lower_bond'
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 688) * and 'upper_bond' inclusively.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 689) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 690) static inline bool ip_defrag_user_in_between(u32 user,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 691) enum ip_defrag_users lower_bond,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 692) enum ip_defrag_users upper_bond)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 693) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 694) return user >= lower_bond && user <= upper_bond;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 695) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 696)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 697) int ip_defrag(struct net *net, struct sk_buff *skb, u32 user);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 698) #ifdef CONFIG_INET
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 699) struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 700) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 701) static inline struct sk_buff *ip_check_defrag(struct net *net, struct sk_buff *skb, u32 user)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 702) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 703) return skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 704) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 705) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 706)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 707) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 708) * Functions provided by ip_forward.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 709) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 710)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 711) int ip_forward(struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 712)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 713) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 714) * Functions provided by ip_options.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 715) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 716)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 717) void ip_options_build(struct sk_buff *skb, struct ip_options *opt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 718) __be32 daddr, struct rtable *rt, int is_frag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 719)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 720) int __ip_options_echo(struct net *net, struct ip_options *dopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 721) struct sk_buff *skb, const struct ip_options *sopt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 722) static inline int ip_options_echo(struct net *net, struct ip_options *dopt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 723) struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 724) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 725) return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 726) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 727)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 728) void ip_options_fragment(struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 729) int __ip_options_compile(struct net *net, struct ip_options *opt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 730) struct sk_buff *skb, __be32 *info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 731) int ip_options_compile(struct net *net, struct ip_options *opt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 732) struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 733) int ip_options_get(struct net *net, struct ip_options_rcu **optp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 734) sockptr_t data, int optlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 735) void ip_options_undo(struct ip_options *opt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 736) void ip_forward_options(struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 737) int ip_options_rcv_srr(struct sk_buff *skb, struct net_device *dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 738)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 739) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 740) * Functions provided by ip_sockglue.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 741) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 742)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 743) void ipv4_pktinfo_prepare(const struct sock *sk, struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 744) void ip_cmsg_recv_offset(struct msghdr *msg, struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 745) struct sk_buff *skb, int tlen, int offset);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 746) int ip_cmsg_send(struct sock *sk, struct msghdr *msg,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 747) struct ipcm_cookie *ipc, bool allow_ipv6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 748) int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 749) unsigned int optlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 750) int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 751) int __user *optlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 752) int ip_ra_control(struct sock *sk, unsigned char on,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 753) void (*destructor)(struct sock *));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 754)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 755) int ip_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 756) void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 757) u32 info, u8 *payload);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 758) void ip_local_error(struct sock *sk, int err, __be32 daddr, __be16 dport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 759) u32 info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 760)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 761) static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 762) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 763) ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 764) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 765)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 766) bool icmp_global_allow(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 767) extern int sysctl_icmp_msgs_per_sec;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 768) extern int sysctl_icmp_msgs_burst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 769)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 770) #ifdef CONFIG_PROC_FS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 771) int ip_misc_proc_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 772) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 773)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 774) int rtm_getroute_parse_ip_proto(struct nlattr *attr, u8 *ip_proto, u8 family,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 775) struct netlink_ext_ack *extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 776)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 777) static inline bool inetdev_valid_mtu(unsigned int mtu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 778) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 779) return likely(mtu >= IPV4_MIN_MTU);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 780) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 781)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 782) void ip_sock_set_freebind(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 783) int ip_sock_set_mtu_discover(struct sock *sk, int val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 784) void ip_sock_set_pktinfo(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 785) void ip_sock_set_recverr(struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 786) void ip_sock_set_tos(struct sock *sk, int val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 787)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 788) #endif /* _IP_H */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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