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) /* xfrm6_protocol.c - Generic xfrm protocol multiplexer for ipv6.
^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/xfrm4_protocol.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 <linux/icmpv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <net/ip6_route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <net/ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <net/protocol.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <net/xfrm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) static struct xfrm6_protocol __rcu *esp6_handlers __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) static struct xfrm6_protocol __rcu *ah6_handlers __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) static struct xfrm6_protocol __rcu *ipcomp6_handlers __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static DEFINE_MUTEX(xfrm6_protocol_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) static inline struct xfrm6_protocol __rcu **proto_handlers(u8 protocol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	switch (protocol) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	case IPPROTO_ESP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 		return &esp6_handlers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	case IPPROTO_AH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		return &ah6_handlers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	case IPPROTO_COMP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 		return &ipcomp6_handlers;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #define for_each_protocol_rcu(head, handler)		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	for (handler = rcu_dereference(head);		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	     handler != NULL;				\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	     handler = rcu_dereference(handler->next))	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) static int xfrm6_rcv_cb(struct sk_buff *skb, u8 protocol, int err)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	struct xfrm6_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	struct xfrm6_protocol __rcu **head = proto_handlers(protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	if (!head)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	for_each_protocol_rcu(*proto_handlers(protocol), handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 		if ((ret = handler->cb_handler(skb, err)) <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) int xfrm6_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		    int encap_type)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	struct xfrm6_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	struct xfrm6_protocol __rcu **head = proto_handlers(nexthdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 	XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	if (!head)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	if (!skb_dst(skb)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 		const struct ipv6hdr *ip6h = ipv6_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		int flags = RT6_LOOKUP_F_HAS_SADDR;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 		struct dst_entry *dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 		struct flowi6 fl6 = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 			.flowi6_iif   = skb->dev->ifindex,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 			.daddr        = ip6h->daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			.saddr        = ip6h->saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			.flowlabel    = ip6_flowinfo(ip6h),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			.flowi6_mark  = skb->mark,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			.flowi6_proto = ip6h->nexthdr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 		dst = ip6_route_input_lookup(dev_net(skb->dev), skb->dev, &fl6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 					     skb, flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		if (dst->error)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 			goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 		skb_dst_set(skb, dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	for_each_protocol_rcu(*head, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 		if ((ret = handler->input_handler(skb, nexthdr, spi, encap_type)) != -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) EXPORT_SYMBOL(xfrm6_rcv_encap);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static int xfrm6_esp_rcv(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	struct xfrm6_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	for_each_protocol_rcu(esp6_handlers, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 		if ((ret = handler->handler(skb)) != -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static int xfrm6_esp_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 			  u8 type, u8 code, int offset, __be32 info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	struct xfrm6_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	for_each_protocol_rcu(esp6_handlers, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		if (!handler->err_handler(skb, opt, type, code, offset, info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static int xfrm6_ah_rcv(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	struct xfrm6_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	for_each_protocol_rcu(ah6_handlers, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 		if ((ret = handler->handler(skb)) != -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) static int xfrm6_ah_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 			 u8 type, u8 code, int offset, __be32 info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	struct xfrm6_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	for_each_protocol_rcu(ah6_handlers, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 		if (!handler->err_handler(skb, opt, type, code, offset, info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 	return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) static int xfrm6_ipcomp_rcv(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	struct xfrm6_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	for_each_protocol_rcu(ipcomp6_handlers, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 		if ((ret = handler->handler(skb)) != -EINVAL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) static int xfrm6_ipcomp_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 			     u8 type, u8 code, int offset, __be32 info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	struct xfrm6_protocol *handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	for_each_protocol_rcu(ipcomp6_handlers, handler)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		if (!handler->err_handler(skb, opt, type, code, offset, info))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 			return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) static const struct inet6_protocol esp6_protocol = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	.handler	=	xfrm6_esp_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	.err_handler	=	xfrm6_esp_err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	.flags		=	INET6_PROTO_NOPOLICY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) static const struct inet6_protocol ah6_protocol = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	.handler	=	xfrm6_ah_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	.err_handler	=	xfrm6_ah_err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	.flags		=	INET6_PROTO_NOPOLICY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) static const struct inet6_protocol ipcomp6_protocol = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	.handler	=	xfrm6_ipcomp_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	.err_handler	=	xfrm6_ipcomp_err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	.flags		=	INET6_PROTO_NOPOLICY,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) static const struct xfrm_input_afinfo xfrm6_input_afinfo = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 	.family		=	AF_INET6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	.callback	=	xfrm6_rcv_cb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) static inline const struct inet6_protocol *netproto(unsigned char protocol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	switch (protocol) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	case IPPROTO_ESP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		return &esp6_protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	case IPPROTO_AH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		return &ah6_protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	case IPPROTO_COMP:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 		return &ipcomp6_protocol;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) int xfrm6_protocol_register(struct xfrm6_protocol *handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 			    unsigned char protocol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	struct xfrm6_protocol __rcu **pprev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	struct xfrm6_protocol *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 	bool add_netproto = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	int ret = -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	int priority = handler->priority;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	if (!proto_handlers(protocol) || !netproto(protocol))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	mutex_lock(&xfrm6_protocol_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (!rcu_dereference_protected(*proto_handlers(protocol),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 				       lockdep_is_held(&xfrm6_protocol_mutex)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		add_netproto = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	for (pprev = proto_handlers(protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	     (t = rcu_dereference_protected(*pprev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 			lockdep_is_held(&xfrm6_protocol_mutex))) != NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	     pprev = &t->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		if (t->priority < priority)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		if (t->priority == priority)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 			goto err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	handler->next = *pprev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 	rcu_assign_pointer(*pprev, handler);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) err:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 	mutex_unlock(&xfrm6_protocol_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 	if (add_netproto) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 		if (inet6_add_protocol(netproto(protocol), protocol)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 			pr_err("%s: can't add protocol\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 			ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) EXPORT_SYMBOL(xfrm6_protocol_register);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) int xfrm6_protocol_deregister(struct xfrm6_protocol *handler,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 			      unsigned char protocol)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	struct xfrm6_protocol __rcu **pprev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	struct xfrm6_protocol *t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	int ret = -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	if (!proto_handlers(protocol) || !netproto(protocol))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	mutex_lock(&xfrm6_protocol_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	for (pprev = proto_handlers(protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 	     (t = rcu_dereference_protected(*pprev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 			lockdep_is_held(&xfrm6_protocol_mutex))) != NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	     pprev = &t->next) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 		if (t == handler) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 			*pprev = handler->next;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 			ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	if (!rcu_dereference_protected(*proto_handlers(protocol),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 				       lockdep_is_held(&xfrm6_protocol_mutex))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 		if (inet6_del_protocol(netproto(protocol), protocol) < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 			pr_err("%s: can't remove protocol\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 			ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	mutex_unlock(&xfrm6_protocol_mutex);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	synchronize_net();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) EXPORT_SYMBOL(xfrm6_protocol_deregister);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) int __init xfrm6_protocol_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 	return xfrm_input_register_afinfo(&xfrm6_input_afinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) void xfrm6_protocol_fini(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	xfrm_input_unregister_afinfo(&xfrm6_input_afinfo);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) }