1 /* SPDX-License-Identifier: GPL-2.0-or-later */
5  *		interface as the means of communication with the user level.
32 #include <net/flow.h>
73 	return ip_hdr(skb)->ihl * 4;  in ip_hdrlen()
89 	*ipcm = (struct ipcm_cookie) { .tos = -1 };  in ipcm_init()
97 	ipcm->sockc.mark = READ_ONCE(inet->sk.sk_mark);  in ipcm_init_sk()
98 	ipcm->sockc.priority = READ_ONCE(inet->sk.sk_priority);  in ipcm_init_sk()
99 	ipcm->sockc.tsflags = READ_ONCE(inet->sk.sk_tsflags);  in ipcm_init_sk()
100 	ipcm->oif = READ_ONCE(inet->sk.sk_bound_dev_if);  in ipcm_init_sk()
101 	ipcm->addr = inet->inet_saddr;  in ipcm_init_sk()
102 	ipcm->protocol = inet->inet_num;  in ipcm_init_sk()
105 #define IPCB(skb) ((struct inet_skb_parm*)((skb)->cb))
106 #define PKTINFO_SKB_CB(skb) ((struct in_pktinfo *)((skb)->cb))
112 	if (skb && ipv4_l3mdev_skb(IPCB(skb)->flags))  in inet_sdif()
113 		return IPCB(skb)->iif;  in inet_sdif()
123    It is user level problem, what it will make with them.
124    I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
187 	struct sk_buff *skb = iter->frag;  in ip_fraglist_next()
189 	iter->frag = skb->next;  in ip_fraglist_next()
244 	return __ip_make_skb(sk, fl4, &sk->sk_write_queue, &inet_sk(sk)->cork.base);  in ip_finish_skb()
252 	if (sock_flag(&inet->sk, SOCK_LOCALROUTE) ||  in ip_sendmsg_scope()
253 	    msg->msg_flags & MSG_DONTROUTE ||  in ip_sendmsg_scope()
254 	    (ipc->opt && ipc->opt->opt.is_strictroute))  in ip_sendmsg_scope()
262 	u8 dsfield = ipc->tos != -1 ? ipc->tos : READ_ONCE(inet->tos);  in get_rttos()
278 				/* -1 if not needed */
288 	return (arg->flags & IP_REPLY_ARG_NOSRCCHECK) ? FLOWI_FLAG_ANYSRC : 0;  in ip_reply_arg_flowi_flags()
298 #define IP_INC_STATS(net, field)	SNMP_INC_STATS64((net)->mib.ip_statistics, field)
299 #define __IP_INC_STATS(net, field)	__SNMP_INC_STATS64((net)->mib.ip_statistics, field)
300 #define IP_ADD_STATS(net, field, val)	SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
301 #define __IP_ADD_STATS(net, field, val) __SNMP_ADD_STATS64((net)->mib.ip_statistics, field, val)
302 #define IP_UPD_PO_STATS(net, field, val) SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, val)
303 #define __IP_UPD_PO_STATS(net, field, val) __SNMP_UPD_PO_STATS64((net)->mib.ip_statistics, field, v…
304 #define NET_INC_STATS(net, field)	SNMP_INC_STATS((net)->mib.net_statistics, field)
305 #define __NET_INC_STATS(net, field)	__SNMP_INC_STATS((net)->mib.net_statistics, field)
306 #define NET_ADD_STATS(net, field, adnd)	SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
307 #define __NET_ADD_STATS(net, field, adnd) __SNMP_ADD_STATS((net)->mib.net_statistics, field, adnd)
358 	u32 range = READ_ONCE(net->ipv4.ip_local_ports.range);  in inet_get_local_port_range()
368 	if (!net->ipv4.sysctl_local_reserved_ports)  in inet_is_local_reserved_port()
370 	return test_bit(port, net->ipv4.sysctl_local_reserved_ports);  in inet_is_local_reserved_port()
380 	return port < READ_ONCE(net->ipv4.sysctl_ip_prot_sock);  in inet_port_requires_bind_service()
407 	(READ_ONCE((net)->ipv4.sysctl_fwmark_reflect) ? (mark) : 0)
411 	return (iph->frag_off & htons(IP_MF | IP_OFFSET)) != 0;  in ip_is_fragment()
418  * check=0xFEFF. It was noticed by Arthur Skawina _year_ ago. --ANK(000625) */
422 	u32 check = (__force u32)iph->check;  in ip_decrease_ttl()
424 	iph->check = (__force __sum16)(check + (check>=0xFFFF));  in ip_decrease_ttl()
425 	return --iph->ttl;  in ip_decrease_ttl()
430 	return inet_dsfield_to_dscp(ip4h->tos);  in ip4h_dscp()
437 	return rt->rt_mtu_locked || dst_metric_locked(dst, RTAX_MTU);  in ip_mtu_locked()
443 	u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);  in ip_dont_fragment()
452 	u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);  in ip_sk_accept_pmtu()
460 	return READ_ONCE(inet_sk(sk)->pmtudisc) < IP_PMTUDISC_PROBE;  in ip_sk_use_pmtu()
465 	u8 pmtudisc = READ_ONCE(inet_sk(sk)->pmtudisc);  in ip_sk_ignore_df()
479 	net = dev_net_rcu(dst->dev);  in ip_dst_mtu_maybe_forward()
480 	if (READ_ONCE(net->ipv4.sysctl_ip_fwd_use_pmtu) ||  in ip_dst_mtu_maybe_forward()
483 		mtu = rt->rt_pmtu;  in ip_dst_mtu_maybe_forward()
484 		if (mtu && time_before(jiffies, rt->dst.expires))  in ip_dst_mtu_maybe_forward()
493 	mtu = READ_ONCE(dst->dev->mtu);  in ip_dst_mtu_maybe_forward()
496 		if (rt->rt_uses_gateway && mtu > 576)  in ip_dst_mtu_maybe_forward()
503 	res = mtu - lwtunnel_headroom(dst->lwtstate, mtu);  in ip_dst_mtu_maybe_forward()
516 		bool forwarding = IPCB(skb)->flags & IPSKB_FORWARDED;  in ip_skb_dst_mtu()
521 	mtu = min(READ_ONCE(skb_dst(skb)->dev->mtu), IP_MAX_MTU);  in ip_skb_dst_mtu()
522 	return mtu - lwtunnel_headroom(skb_dst(skb)->lwtstate, mtu);  in ip_skb_dst_mtu()
530 	    refcount_dec_and_test(&fib_metrics->refcnt))  in ip_fib_metrics_put()
538 	dst_init_metrics(dst, fib_metrics->metrics, true);  in ip_dst_init_metrics()
541 		dst->_metrics |= DST_METRICS_REFCOUNTED;  in ip_dst_init_metrics()
542 		refcount_inc(&fib_metrics->refcnt);  in ip_dst_init_metrics()
551 	if (p != &dst_default_metrics && refcount_dec_and_test(&p->refcnt))  in ip_dst_metrics_put()
565 	if (sk && inet_sk(sk)->inet_daddr) {  in ip_select_ident_segs()
573 			val = atomic_read(&inet_sk(sk)->inet_id);  in ip_select_ident_segs()
574 			atomic_set(&inet_sk(sk)->inet_id, val + segs);  in ip_select_ident_segs()
576 			val = atomic_add_return(segs, &inet_sk(sk)->inet_id);  in ip_select_ident_segs()
578 		iph->id = htons(val);  in ip_select_ident_segs()
581 	if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) {  in ip_select_ident_segs()
582 		iph->id = 0;  in ip_select_ident_segs()
597 	return csum_tcpudp_nofold(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr,  in inet_compute_pseudo()
598 				  skb->len, proto, 0);  in inet_compute_pseudo()
602  * Equivalent to :	flow->v4addrs.src = iph->saddr;
603  *			flow->v4addrs.dst = iph->daddr;
605 static inline void iph_to_flow_copy_v4addrs(struct flow_keys *flow,  in iph_to_flow_copy_v4addrs()  argument
608 	BUILD_BUG_ON(offsetof(typeof(flow->addrs), v4addrs.dst) !=  in iph_to_flow_copy_v4addrs()
609 		     offsetof(typeof(flow->addrs), v4addrs.src) +  in iph_to_flow_copy_v4addrs()
610 			      sizeof(flow->addrs.v4addrs.src));  in iph_to_flow_copy_v4addrs()
611 	memcpy(&flow->addrs.v4addrs, &iph->addrs, sizeof(flow->addrs.v4addrs));  in iph_to_flow_copy_v4addrs()
612 	flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS;  in iph_to_flow_copy_v4addrs()
633  *	Map a multicast IP onto multicast MAC for type IP-over-InfiniBand.
682 	inet_sk(sk)->inet_rcv_saddr = inet_sk(sk)->inet_saddr = 0;  in inet_reset_saddr()
684 	if (sk->sk_family == PF_INET6) {  in inet_reset_saddr()
687 		memset(&np->saddr, 0, sizeof(np->saddr));  in inet_reset_saddr()
688 		memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr));  in inet_reset_saddr()
772 	return __ip_options_echo(net, dopt, skb, &IPCB(skb)->opt);  in ip_options_echo()
796 int do_ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
798 int ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval,
800 int do_ip_getsockopt(struct sock *sk, int level, int optname,
802 int ip_getsockopt(struct sock *sk, int level, int optname, char __user *optval,
815 	ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0);  in ip_cmsg_recv()