1 // SPDX-License-Identifier: GPL-2.0-or-later
5  * Authors	Mitsuru KANDA  <mk@linux-ipv6.org>
6  *		YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
31 	u32 spi;  member
41  * xfrm_tunnel_spi things are for allocating unique id ("spi")
48 	u32			spi;  member
64 	h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;  in xfrm6_tunnel_spi_hash_byaddr()
69 static inline unsigned int xfrm6_tunnel_spi_hash_byspi(u32 spi)  in xfrm6_tunnel_spi_hash_byspi()  argument
71 	return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;  in xfrm6_tunnel_spi_hash_byspi()
80 			     &xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],  in __xfrm6_tunnel_spi_lookup()
82 		if (xfrm6_addr_equal(&x6spi->addr, saddr))  in __xfrm6_tunnel_spi_lookup()
92 	u32 spi;  in xfrm6_tunnel_spi_lookup()  local
96 	spi = x6spi ? x6spi->spi : 0;  in xfrm6_tunnel_spi_lookup()
98 	return htonl(spi);  in xfrm6_tunnel_spi_lookup()
102 static int __xfrm6_tunnel_spi_check(struct net *net, u32 spi)  in __xfrm6_tunnel_spi_check()  argument
106 	int index = xfrm6_tunnel_spi_hash_byspi(spi);  in __xfrm6_tunnel_spi_check()
109 			     &xfrm6_tn->spi_byspi[index],  in __xfrm6_tunnel_spi_check()
111 		if (x6spi->spi == spi)  in __xfrm6_tunnel_spi_check()
112 			return -1;  in __xfrm6_tunnel_spi_check()
120 	u32 spi;  in __xfrm6_tunnel_alloc_spi()  local
124 	if (xfrm6_tn->spi < XFRM6_TUNNEL_SPI_MIN ||  in __xfrm6_tunnel_alloc_spi()
125 	    xfrm6_tn->spi >= XFRM6_TUNNEL_SPI_MAX)  in __xfrm6_tunnel_alloc_spi()
126 		xfrm6_tn->spi = XFRM6_TUNNEL_SPI_MIN;  in __xfrm6_tunnel_alloc_spi()
128 		xfrm6_tn->spi++;  in __xfrm6_tunnel_alloc_spi()
130 	for (spi = xfrm6_tn->spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {  in __xfrm6_tunnel_alloc_spi()
131 		index = __xfrm6_tunnel_spi_check(net, spi);  in __xfrm6_tunnel_alloc_spi()
135 		if (spi == XFRM6_TUNNEL_SPI_MAX)  in __xfrm6_tunnel_alloc_spi()
138 	for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tn->spi; spi++) {  in __xfrm6_tunnel_alloc_spi()
139 		index = __xfrm6_tunnel_spi_check(net, spi);  in __xfrm6_tunnel_alloc_spi()
143 	spi = 0;  in __xfrm6_tunnel_alloc_spi()
146 	xfrm6_tn->spi = spi;  in __xfrm6_tunnel_alloc_spi()
151 	memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));  in __xfrm6_tunnel_alloc_spi()
152 	x6spi->spi = spi;  in __xfrm6_tunnel_alloc_spi()
153 	refcount_set(&x6spi->refcnt, 1);  in __xfrm6_tunnel_alloc_spi()
155 	hlist_add_head_rcu(&x6spi->list_byspi, &xfrm6_tn->spi_byspi[index]);  in __xfrm6_tunnel_alloc_spi()
158 	hlist_add_head_rcu(&x6spi->list_byaddr, &xfrm6_tn->spi_byaddr[index]);  in __xfrm6_tunnel_alloc_spi()
160 	return spi;  in __xfrm6_tunnel_alloc_spi()
166 	u32 spi;  in xfrm6_tunnel_alloc_spi()  local
171 		refcount_inc(&x6spi->refcnt);  in xfrm6_tunnel_alloc_spi()
172 		spi = x6spi->spi;  in xfrm6_tunnel_alloc_spi()
174 		spi = __xfrm6_tunnel_alloc_spi(net, saddr);  in xfrm6_tunnel_alloc_spi()
177 	return htonl(spi);  in xfrm6_tunnel_alloc_spi()
196 				  &xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],  in xfrm6_tunnel_free_spi()
199 		if (xfrm6_addr_equal(&x6spi->addr, saddr)) {  in xfrm6_tunnel_free_spi()
200 			if (refcount_dec_and_test(&x6spi->refcnt)) {  in xfrm6_tunnel_free_spi()
201 				hlist_del_rcu(&x6spi->list_byaddr);  in xfrm6_tunnel_free_spi()
202 				hlist_del_rcu(&x6spi->list_byspi);  in xfrm6_tunnel_free_spi()
203 				call_rcu(&x6spi->rcu_head, x6spi_destroy_rcu);  in xfrm6_tunnel_free_spi()
213 	skb_push(skb, -skb_network_offset(skb));  in xfrm6_tunnel_output()
219 	return skb_network_header(skb)[IP6CB(skb)->nhoff];  in xfrm6_tunnel_input()
224 	struct net *net = dev_net(skb->dev);  in xfrm6_tunnel_rcv()
226 	__be32 spi;  in xfrm6_tunnel_rcv()  local
228 	spi = xfrm6_tunnel_spi_lookup(net, (const xfrm_address_t *)&iph->saddr);  in xfrm6_tunnel_rcv()
229 	return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi, NULL);  in xfrm6_tunnel_rcv()
275 	if (x->props.mode != XFRM_MODE_TUNNEL) {  in xfrm6_tunnel_init_state()
277 		return -EINVAL;  in xfrm6_tunnel_init_state()
280 	if (x->encap) {  in xfrm6_tunnel_init_state()
282 		return -EINVAL;  in xfrm6_tunnel_init_state()
285 	x->props.header_len = sizeof(struct ipv6hdr);  in xfrm6_tunnel_init_state()
294 	xfrm6_tunnel_free_spi(net, (xfrm_address_t *)&x->props.saddr);  in xfrm6_tunnel_destroy()
324 		INIT_HLIST_HEAD(&xfrm6_tn->spi_byaddr[i]);  in xfrm6_tunnel_net_init()
326 		INIT_HLIST_HEAD(&xfrm6_tn->spi_byspi[i]);  in xfrm6_tunnel_net_init()
327 	xfrm6_tn->spi = 0;  in xfrm6_tunnel_net_init()
341 		WARN_ON_ONCE(!hlist_empty(&xfrm6_tn->spi_byaddr[i]));  in xfrm6_tunnel_net_exit()
344 		WARN_ON_ONCE(!hlist_empty(&xfrm6_tn->spi_byspi[i]));  in xfrm6_tunnel_net_exit()
360 		return -ENOMEM;  in xfrm6_tunnel_init()