Orange Pi5 kernel

^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) /* xfrm4_protocol.c - Generic xfrm protocol multiplexer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2013 secunet Security Networks AG
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Author:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Steffen Klassert <steffen.klassert@secunet.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Based on:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * net/ipv4/tunnel4.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <net/icmp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <net/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <net/xfrm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) static struct xfrm4_protocol __rcu *esp4_handlers __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) static struct xfrm4_protocol __rcu *ah4_handlers __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) static struct xfrm4_protocol __rcu *ipcomp4_handlers __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) static DEFINE_MUTEX(xfrm4_protocol_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) static inline struct xfrm4_protocol __rcu **proto_handlers(u8 protocol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	switch (protocol) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	case IPPROTO_ESP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		return &esp4_handlers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	case IPPROTO_AH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 		return &ah4_handlers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	case IPPROTO_COMP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 		return &ipcomp4_handlers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) #define for_each_protocol_rcu(head, handler)		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	for (handler = rcu_dereference(head);		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	     handler != NULL;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	     handler = rcu_dereference(handler->next))	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) static int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct xfrm4_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	struct xfrm4_protocol __rcu **head = proto_handlers(protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	if (!head)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	for_each_protocol_rcu(*head, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		if ((ret = handler->cb_handler(skb, err)) <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		    int encap_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	struct xfrm4_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	struct xfrm4_protocol __rcu **head = proto_handlers(nexthdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	XFRM_SPI_SKB_CB(skb)->family = AF_INET;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	if (!head)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	if (!skb_dst(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 		const struct iphdr *iph = ip_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		if (ip_route_input_noref(skb, iph->daddr, iph->saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 					 iph->tos, skb->dev))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	for_each_protocol_rcu(*head, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		if ((ret = handler->input_handler(skb, nexthdr, spi, encap_type)) != -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) EXPORT_SYMBOL(xfrm4_rcv_encap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) static int xfrm4_esp_rcv(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	struct xfrm4_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 	for_each_protocol_rcu(esp4_handlers, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		if ((ret = handler->handler(skb)) != -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) static int xfrm4_esp_err(struct sk_buff *skb, u32 info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	struct xfrm4_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	for_each_protocol_rcu(esp4_handlers, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 		if (!handler->err_handler(skb, info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) static int xfrm4_ah_rcv(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	struct xfrm4_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	for_each_protocol_rcu(ah4_handlers, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		if ((ret = handler->handler(skb)) != -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) static int xfrm4_ah_err(struct sk_buff *skb, u32 info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	struct xfrm4_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	for_each_protocol_rcu(ah4_handlers, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		if (!handler->err_handler(skb, info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	return -ENOENT;
^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) static int xfrm4_ipcomp_rcv(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	struct xfrm4_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 	for_each_protocol_rcu(ipcomp4_handlers, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 		if ((ret = handler->handler(skb)) != -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) static int xfrm4_ipcomp_err(struct sk_buff *skb, u32 info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	struct xfrm4_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	for_each_protocol_rcu(ipcomp4_handlers, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		if (!handler->err_handler(skb, info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) static const struct net_protocol esp4_protocol = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	.handler	=	xfrm4_esp_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	.err_handler	=	xfrm4_esp_err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	.no_policy	=	1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	.netns_ok	=	1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) static const struct net_protocol ah4_protocol = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	.handler	=	xfrm4_ah_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	.err_handler	=	xfrm4_ah_err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	.no_policy	=	1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	.netns_ok	=	1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) static const struct net_protocol ipcomp4_protocol = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	.handler	=	xfrm4_ipcomp_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 	.err_handler	=	xfrm4_ipcomp_err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	.no_policy	=	1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	.netns_ok	=	1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) static const struct xfrm_input_afinfo xfrm4_input_afinfo = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	.family		=	AF_INET,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	.callback	=	xfrm4_rcv_cb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static inline const struct net_protocol *netproto(unsigned char protocol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	switch (protocol) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	case IPPROTO_ESP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 		return &esp4_protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	case IPPROTO_AH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 		return &ah4_protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	case IPPROTO_COMP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 		return &ipcomp4_protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) int xfrm4_protocol_register(struct xfrm4_protocol *handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 			    unsigned char protocol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	struct xfrm4_protocol __rcu **pprev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	struct xfrm4_protocol *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	bool add_netproto = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	int ret = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	int priority = handler->priority;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	if (!proto_handlers(protocol) || !netproto(protocol))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 	mutex_lock(&xfrm4_protocol_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	if (!rcu_dereference_protected(*proto_handlers(protocol),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 				       lockdep_is_held(&xfrm4_protocol_mutex)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 		add_netproto = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	for (pprev = proto_handlers(protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	     (t = rcu_dereference_protected(*pprev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 			lockdep_is_held(&xfrm4_protocol_mutex))) != NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	     pprev = &t->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		if (t->priority < priority)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		if (t->priority == priority)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	handler->next = *pprev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 	rcu_assign_pointer(*pprev, handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	mutex_unlock(&xfrm4_protocol_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	if (add_netproto) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		if (inet_add_protocol(netproto(protocol), protocol)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			pr_err("%s: can't add protocol\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) EXPORT_SYMBOL(xfrm4_protocol_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) int xfrm4_protocol_deregister(struct xfrm4_protocol *handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 			      unsigned char protocol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	struct xfrm4_protocol __rcu **pprev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	struct xfrm4_protocol *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	int ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	if (!proto_handlers(protocol) || !netproto(protocol))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	mutex_lock(&xfrm4_protocol_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	for (pprev = proto_handlers(protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	     (t = rcu_dereference_protected(*pprev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 			lockdep_is_held(&xfrm4_protocol_mutex))) != NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	     pprev = &t->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 		if (t == handler) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 			*pprev = handler->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 			ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	if (!rcu_dereference_protected(*proto_handlers(protocol),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 				       lockdep_is_held(&xfrm4_protocol_mutex))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 		if (inet_del_protocol(netproto(protocol), protocol) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 			pr_err("%s: can't remove protocol\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 			ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	mutex_unlock(&xfrm4_protocol_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	synchronize_net();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) EXPORT_SYMBOL(xfrm4_protocol_deregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) void __init xfrm4_protocol_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 	xfrm_input_register_afinfo(&xfrm4_input_afinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) EXPORT_SYMBOL(xfrm4_protocol_init);