1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* xfrm4_protocol.c - Generic xfrm protocol multiplexer.
40 #define for_each_protocol_rcu(head, handler)		\  argument
41 	for (handler = rcu_dereference(head);		\
43 	     handler = rcu_dereference(handler->next))	\
49 	struct xfrm4_protocol __rcu **head = proto_handlers(protocol);  in xfrm4_rcv_cb()  local
51 	if (!head)  in xfrm4_rcv_cb()
54 	for_each_protocol_rcu(*head, handler)  in xfrm4_rcv_cb()
55 		if ((ret = handler->cb_handler(skb, err)) <= 0)  in xfrm4_rcv_cb()
66 	struct xfrm4_protocol __rcu **head = proto_handlers(nexthdr);  in xfrm4_rcv_encap()  local
68 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;  in xfrm4_rcv_encap()
69 	XFRM_SPI_SKB_CB(skb)->family = AF_INET;  in xfrm4_rcv_encap()
70 	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);  in xfrm4_rcv_encap()
72 	if (!head)  in xfrm4_rcv_encap()
78 		if (ip_route_input_noref(skb, iph->daddr, iph->saddr,  in xfrm4_rcv_encap()
79 					 iph->tos, skb->dev))  in xfrm4_rcv_encap()
83 	for_each_protocol_rcu(*head, handler)  in xfrm4_rcv_encap()
84 		if ((ret = handler->input_handler(skb, nexthdr, spi, encap_type)) != -EINVAL)  in xfrm4_rcv_encap()
101 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;  in xfrm4_esp_rcv()
104 		if ((ret = handler->handler(skb)) != -EINVAL)  in xfrm4_esp_rcv()
118 		if (!handler->err_handler(skb, info))  in xfrm4_esp_err()
121 	return -ENOENT;  in xfrm4_esp_err()
129 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;  in xfrm4_ah_rcv()
132 		if ((ret = handler->handler(skb)) != -EINVAL)  in xfrm4_ah_rcv()
146 		if (!handler->err_handler(skb, info))  in xfrm4_ah_err()
149 	return -ENOENT;  in xfrm4_ah_err()
157 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;  in xfrm4_ipcomp_rcv()
160 		if ((ret = handler->handler(skb)) != -EINVAL)  in xfrm4_ipcomp_rcv()
174 		if (!handler->err_handler(skb, info))  in xfrm4_ipcomp_err()
177 	return -ENOENT;  in xfrm4_ipcomp_err()
221 	struct xfrm4_protocol *t;  in xfrm4_protocol_register()  local
223 	int ret = -EEXIST;  in xfrm4_protocol_register()
224 	int priority = handler->priority;  in xfrm4_protocol_register()
227 		return -EINVAL;  in xfrm4_protocol_register()
236 	     (t = rcu_dereference_protected(*pprev,  in xfrm4_protocol_register()
238 	     pprev = &t->next) {  in xfrm4_protocol_register()
239 		if (t->priority < priority)  in xfrm4_protocol_register()
241 		if (t->priority == priority)  in xfrm4_protocol_register()
245 	handler->next = *pprev;  in xfrm4_protocol_register()
255 			pr_err("%s: can't add protocol\n", __func__);  in xfrm4_protocol_register()
256 			ret = -EAGAIN;  in xfrm4_protocol_register()
268 	struct xfrm4_protocol *t;  in xfrm4_protocol_deregister()  local
269 	int ret = -ENOENT;  in xfrm4_protocol_deregister()
272 		return -EINVAL;  in xfrm4_protocol_deregister()
277 	     (t = rcu_dereference_protected(*pprev,  in xfrm4_protocol_deregister()
279 	     pprev = &t->next) {  in xfrm4_protocol_deregister()
280 		if (t == handler) {  in xfrm4_protocol_deregister()
281 			*pprev = handler->next;  in xfrm4_protocol_deregister()
290 			pr_err("%s: can't remove protocol\n", __func__);  in xfrm4_protocol_deregister()
291 			ret = -EAGAIN;  in xfrm4_protocol_deregister()