1 /* SPDX-License-Identifier: GPL-2.0-or-later */
34 #define NEXTHDR_HOP		0	/* Hop-by-hop option header. */
55 /* Limits on Hop-by-Hop and Destination options.
58  * Hop-by-Hop or Destination options other then the packet must fit in an MTU.
63  *   - Limit the number of options in a Hop-by-Hop or Destination options
65  *   - Limit the byte length of a Hop-by-Hop or Destination options extension
67  *   - Disallow unknown options
77  * options or Hop-by-Hop options. If the number is less than zero then unknown
82  * Hop-by-Hop options extension header. Setting the value to INT_MAX
89 /* Default limits for Hop-by-Hop and Destination options */
98  *	type	-	unicast | multicast
99  *	scope	-	local	| site	    | global
100  *	v4	-	compat
125 	((a)->s6_addr[1] & 0x0f)	/* nonstandard */
126 #define __IPV6_ADDR_SCOPE_INVALID	-1
137 	((a)->s6_addr[1] & 0x10)
139 	((a)->s6_addr[1] & 0x20)
141 	((a)->s6_addr[1] & 0x40)
184 	struct sk_buff *skb = iter->frag;  in ip6_fraglist_next()
186 	iter->frag = skb->next;  in ip6_fraglist_next()
212 	((net)->ipv6.sysctl.fwmark_reflect ? (mark) : 0)
224 		mod##SNMP_INC_STATS64((_idev)->stats.statname, (field));\
225 	mod##SNMP_INC_STATS64((net)->mib.statname##_statistics, (field));\
233 		SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
234 	mod##SNMP_INC_STATS((net)->mib.statname##_statistics, (field));\
242 		SNMP_INC_STATS_ATOMIC_LONG((_idev)->stats.statname##dev, (field)); \
243 	SNMP_INC_STATS_ATOMIC_LONG((net)->mib.statname##_statistics, (field));\
250 		mod##SNMP_ADD_STATS((_idev)->stats.statname, (field), (val)); \
251 	mod##SNMP_ADD_STATS((net)->mib.statname##_statistics, (field), (val));\
258 		mod##SNMP_UPD_PO_STATS((_idev)->stats.statname, field, (val)); \
259 	mod##SNMP_UPD_PO_STATS((net)->mib.statname##_statistics, field, (val));\
289 	int			sel;  member
369 		.hlimit = -1,  in ipcm6_init()
370 		.tclass = -1,  in ipcm6_init()
371 		.dontfrag = -1,  in ipcm6_init()
379 		.hlimit = -1,  in ipcm6_init_sk()
380 		.tclass = inet6_sk(sk)->tclass,  in ipcm6_init_sk()
390 	opt = rcu_dereference(np->opt);  in txopt_get()
392 		if (!refcount_inc_not_zero(&opt->refcnt))  in txopt_get()
403 	if (opt && refcount_dec_and_test(&opt->refcnt))  in txopt_put()
415 	    READ_ONCE(sock_net(sk)->ipv6.flowlabel_has_excl))  in fl6_sock_lookup()
416 		return __fl6_sock_lookup(sk, label) ? : ERR_PTR(-ENOENT);  in fl6_sock_lookup()
436 		atomic_dec(&fl->users);  in fl6_sock_release()
445 int ip6_ra_control(struct sock *sk, int sel);
473  * It assumes headers are already in skb->head.
481 	if (likely(skb->len <= GRO_LEGACY_MAX_SIZE))  in ipv6_has_hopopt_jumbo()
484 	if (skb->protocol != htons(ETH_P_IPV6))  in ipv6_has_hopopt_jumbo()
494 	if (nhdr->nexthdr != NEXTHDR_HOP)  in ipv6_has_hopopt_jumbo()
498 	if (jhdr->tlv_type != IPV6_TLV_JUMBO || jhdr->hdrlen != 0 ||  in ipv6_has_hopopt_jumbo()
499 	    jhdr->nexthdr != IPPROTO_TCP)  in ipv6_has_hopopt_jumbo()
501 	return jhdr->nexthdr;  in ipv6_has_hopopt_jumbo()
518 		return -1;  in ipv6_hopopt_jumbo_remove()
524 		skb_network_header(skb) - skb_mac_header(skb) +  in ipv6_hopopt_jumbo_remove()
528 	skb->network_header += hophdr_len;  in ipv6_hopopt_jumbo_remove()
529 	skb->mac_header += hophdr_len;  in ipv6_hopopt_jumbo_remove()
532 	h6->nexthdr = nexthdr;  in ipv6_hopopt_jumbo_remove()
539 	s32 accept_ra = READ_ONCE(idev->cnf.accept_ra);  in ipv6_accept_ra()
544 	return READ_ONCE(idev->cnf.forwarding) ? accept_ra == 2 :  in ipv6_accept_ra()
602 	return !!(((a1->s6_addr32[0] ^ a2->s6_addr32[0]) & m->s6_addr32[0]) |  in ipv6_masked_addr_cmp()
603 		  ((a1->s6_addr32[1] ^ a2->s6_addr32[1]) & m->s6_addr32[1]) |  in ipv6_masked_addr_cmp()
604 		  ((a1->s6_addr32[2] ^ a2->s6_addr32[2]) & m->s6_addr32[2]) |  in ipv6_masked_addr_cmp()
605 		  ((a1->s6_addr32[3] ^ a2->s6_addr32[3]) & m->s6_addr32[3]));  in ipv6_masked_addr_cmp()
617 	memset(pfx->s6_addr, 0, sizeof(pfx->s6_addr));  in ipv6_addr_prefix()
618 	memcpy(pfx->s6_addr, addr, o);  in ipv6_addr_prefix()
620 		pfx->s6_addr[o] = addr->s6_addr[o] & (0xff00 >> b);  in ipv6_addr_prefix()
631 	memcpy(addr->s6_addr, pfx, o);  in ipv6_addr_prefix_copy()
633 		addr->s6_addr[o] &= ~(0xff00 >> b);  in ipv6_addr_prefix_copy()
634 		addr->s6_addr[o] |= (pfx->s6_addr[o] & (0xff00 >> b));  in ipv6_addr_prefix_copy()
662 	__ipv6_addr_set_half(&addr->s6_addr32[0], w1, w2);  in ipv6_addr_set()
663 	__ipv6_addr_set_half(&addr->s6_addr32[2], w3, w4);  in ipv6_addr_set()
675 	return ((a1->s6_addr32[0] ^ a2->s6_addr32[0]) |  in ipv6_addr_equal()
676 		(a1->s6_addr32[1] ^ a2->s6_addr32[1]) |  in ipv6_addr_equal()
677 		(a1->s6_addr32[2] ^ a2->s6_addr32[2]) |  in ipv6_addr_equal()
678 		(a1->s6_addr32[3] ^ a2->s6_addr32[3])) == 0;  in ipv6_addr_equal()
687 	if (len && ((*a1 ^ *a2) & cpu_to_be64((~0UL) << (64 - len))))  in __ipv6_prefix_equal64_half()
702 		return __ipv6_prefix_equal64_half(a1 + 1, a2 + 1, prefixlen - 64);  in ipv6_prefix_equal()
711 	const __be32 *a1 = addr1->s6_addr32;  in ipv6_prefix_equal()
712 	const __be32 *a2 = addr2->s6_addr32;  in ipv6_prefix_equal()
722 	if (pbi && ((a1[pdw] ^ a2[pdw]) & htonl((0xffffffff) << (32 - pbi))))  in ipv6_prefix_equal()
736 	return (a->s6_addr32[0] | a->s6_addr32[1] |  in ipv6_addr_any()
737 		a->s6_addr32[2] | a->s6_addr32[3]) == 0;  in ipv6_addr_any()
749 	return (__force u32)(a->s6_addr32[0] ^ a->s6_addr32[1] ^  in ipv6_addr_hash()
750 			     a->s6_addr32[2] ^ a->s6_addr32[3]);  in ipv6_addr_hash()
757 	return jhash2((__force const u32 *)a->s6_addr32,  in __ipv6_addr_jhash()
758 		      ARRAY_SIZE(a->s6_addr32), initval);  in __ipv6_addr_jhash()
768 	return (a->s6_addr32[0] | a->s6_addr32[1] |  in ipv6_addr_loopback()
769 		a->s6_addr32[2] | (a->s6_addr32[3] ^ cpu_to_be32(1))) == 0;  in ipv6_addr_loopback()
775  * since all of the endian-annotated types are fixed size regardless of arch.
783 		(__force unsigned long)(a->s6_addr32[0] | a->s6_addr32[1]) |  in ipv6_addr_v4mapped()
785 		(__force unsigned long)(a->s6_addr32[2] ^  in ipv6_addr_v4mapped()
791 	return ipv6_addr_v4mapped(a) && ipv4_is_loopback(a->s6_addr32[3]);  in ipv6_addr_v4mapped_loopback()
803 		hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);  in ipv6_portaddr_hash()
805 		hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);  in ipv6_portaddr_hash()
816 	return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);  in ipv6_addr_orchid()
821 	return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);  in ipv6_addr_is_multicast()
847 			return i * 32 + 31 - __fls(ntohl(xb));  in __ipv6_addr_diff32()
864 	 *					--ANK (980803)  in __ipv6_addr_diff32()
880 			return i * 64 + 63 - __fls(be64_to_cpu(xb));  in __ipv6_addr_diff64()
913 	if (ipv6_addr_is_multicast(&fl6->daddr))  in ip6_sk_dst_hoplimit()
914 		hlimit = READ_ONCE(np->mcast_hops);  in ip6_sk_dst_hoplimit()
916 		hlimit = READ_ONCE(np->hop_limit);  in ip6_sk_dst_hoplimit()
923  * Equivalent to :	flow->v6addrs.src = iph->saddr;
924  *			flow->v6addrs.dst = iph->daddr;
929 	BUILD_BUG_ON(offsetof(typeof(flow->addrs), v6addrs.dst) !=  in iph_to_flow_copy_v6addrs()
930 		     offsetof(typeof(flow->addrs), v6addrs.src) +  in iph_to_flow_copy_v6addrs()
931 		     sizeof(flow->addrs.v6addrs.src));  in iph_to_flow_copy_v6addrs()
932 	memcpy(&flow->addrs.v6addrs, &iph->addrs, sizeof(flow->addrs.v6addrs));  in iph_to_flow_copy_v6addrs()
933 	flow->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;  in iph_to_flow_copy_v6addrs()
941 	return net->ipv6.sysctl.ip_nonlocal_bind ||  in ipv6_can_nonlocal_bind()
942 		test_bit(INET_FLAGS_FREEBIND, &inet->inet_flags) ||  in ipv6_can_nonlocal_bind()
943 		test_bit(INET_FLAGS_TRANSPARENT, &inet->inet_flags);  in ipv6_can_nonlocal_bind()
968 	    net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF ||  in ip6_make_flowlabel()
970 	     net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED))  in ip6_make_flowlabel()
983 	if (net->ipv6.sysctl.flowlabel_state_ranges)  in ip6_make_flowlabel()
991 	switch (net->ipv6.sysctl.auto_flowlabels) {  in ip6_default_np_autolabel()
1017 	return net->ipv6.sysctl.multipath_hash_policy;  in ip6_multipath_hash_policy()
1021 	return net->ipv6.sysctl.multipath_hash_fields;  in ip6_multipath_hash_fields()
1070 	return fl6->flowlabel & IPV6_FLOWLABEL_MASK;  in flowi6_get_flowlabel()
1078  *	rcv function (called from netdevice level)
1089  *	upper-layer output functions
1122 	return __ip6_make_skb(sk, &sk->sk_write_queue, &inet_sk(sk)->cork,  in ip6_finish_skb()
1123 			      &inet6_sk(sk)->cork);  in ip6_finish_skb()
1287 	if (inet_sk(sk)->inet_num)  in ip6_sock_set_v6only()
1288 		return -EINVAL;  in ip6_sock_set_v6only()
1290 	sk->sk_ipv6only = true;  in ip6_sock_set_v6only()
1329 		return -EINVAL;  in ip6_sock_set_addr_preferences()
1343 		return -EINVAL;  in ip6_sock_set_addr_preferences()
1353 		return -EINVAL;  in ip6_sock_set_addr_preferences()
1356 	WRITE_ONCE(inet6_sk(sk)->srcprefs,  in ip6_sock_set_addr_preferences()
1357 		   (READ_ONCE(inet6_sk(sk)->srcprefs) & prefmask) | pref);  in ip6_sock_set_addr_preferences()
1364 	inet6_sk(sk)->rxopt.bits.rxinfo = true;  in ip6_sock_set_recvpktinfo()