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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (C)2003,2004 USAGI/WIDE Project
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Authors	Mitsuru KANDA  <mk@linux-ipv6.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *		YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * Based on net/ipv4/xfrm4_tunnel.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/xfrm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/rculist.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <net/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <net/xfrm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <net/ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #include <linux/ipv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/icmpv6.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #include <net/netns/generic.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #define XFRM6_TUNNEL_SPI_BYADDR_HSIZE 256
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #define XFRM6_TUNNEL_SPI_BYSPI_HSIZE 256
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #define XFRM6_TUNNEL_SPI_MIN	1
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #define XFRM6_TUNNEL_SPI_MAX	0xffffffff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) struct xfrm6_tunnel_net {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	struct hlist_head spi_byaddr[XFRM6_TUNNEL_SPI_BYADDR_HSIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	struct hlist_head spi_byspi[XFRM6_TUNNEL_SPI_BYSPI_HSIZE];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	u32 spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) static unsigned int xfrm6_tunnel_net_id __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) static inline struct xfrm6_tunnel_net *xfrm6_tunnel_pernet(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	return net_generic(net, xfrm6_tunnel_net_id);
^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) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41)  * xfrm_tunnel_spi things are for allocating unique id ("spi")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42)  * per xfrm_address_t.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) struct xfrm6_tunnel_spi {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	struct hlist_node	list_byaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	struct hlist_node	list_byspi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	xfrm_address_t		addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	u32			spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	refcount_t		refcnt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	struct rcu_head		rcu_head;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) static DEFINE_SPINLOCK(xfrm6_tunnel_spi_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) static struct kmem_cache *xfrm6_tunnel_spi_kmem __read_mostly;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) static inline unsigned int xfrm6_tunnel_spi_hash_byaddr(const xfrm_address_t *addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	unsigned int h;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	h = ipv6_addr_hash((const struct in6_addr *)addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	h ^= h >> 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	h ^= h >> 8;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	h &= XFRM6_TUNNEL_SPI_BYADDR_HSIZE - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	return h;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) static inline unsigned int xfrm6_tunnel_spi_hash_byspi(u32 spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	return spi % XFRM6_TUNNEL_SPI_BYSPI_HSIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) static struct xfrm6_tunnel_spi *__xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	struct xfrm6_tunnel_spi *x6spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	hlist_for_each_entry_rcu(x6spi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			     &xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 			     list_byaddr, lockdep_is_held(&xfrm6_tunnel_spi_lock)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 		if (xfrm6_addr_equal(&x6spi->addr, saddr))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 			return x6spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	return NULL;
^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) __be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	struct xfrm6_tunnel_spi *x6spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	u32 spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	rcu_read_lock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	x6spi = __xfrm6_tunnel_spi_lookup(net, saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	spi = x6spi ? x6spi->spi : 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	rcu_read_unlock_bh();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	return htonl(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) EXPORT_SYMBOL(xfrm6_tunnel_spi_lookup);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static int __xfrm6_tunnel_spi_check(struct net *net, u32 spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	struct xfrm6_tunnel_spi *x6spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 	int index = xfrm6_tunnel_spi_hash_byspi(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	hlist_for_each_entry(x6spi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 			     &xfrm6_tn->spi_byspi[index],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 			     list_byspi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		if (x6spi->spi == spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 			return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	return index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) static u32 __xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	u32 spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	struct xfrm6_tunnel_spi *x6spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	int index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	if (xfrm6_tn->spi < XFRM6_TUNNEL_SPI_MIN ||
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	    xfrm6_tn->spi >= XFRM6_TUNNEL_SPI_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 		xfrm6_tn->spi = XFRM6_TUNNEL_SPI_MIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 		xfrm6_tn->spi++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	for (spi = xfrm6_tn->spi; spi <= XFRM6_TUNNEL_SPI_MAX; spi++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		index = __xfrm6_tunnel_spi_check(net, spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 		if (index >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 			goto alloc_spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		if (spi == XFRM6_TUNNEL_SPI_MAX)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 	for (spi = XFRM6_TUNNEL_SPI_MIN; spi < xfrm6_tn->spi; spi++) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		index = __xfrm6_tunnel_spi_check(net, spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 		if (index >= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 			goto alloc_spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 	spi = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) alloc_spi:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	xfrm6_tn->spi = spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	x6spi = kmem_cache_alloc(xfrm6_tunnel_spi_kmem, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	if (!x6spi)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 	memcpy(&x6spi->addr, saddr, sizeof(x6spi->addr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 	x6spi->spi = spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	refcount_set(&x6spi->refcnt, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	hlist_add_head_rcu(&x6spi->list_byspi, &xfrm6_tn->spi_byspi[index]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	index = xfrm6_tunnel_spi_hash_byaddr(saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	hlist_add_head_rcu(&x6spi->list_byaddr, &xfrm6_tn->spi_byaddr[index]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	return spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	struct xfrm6_tunnel_spi *x6spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	u32 spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	spin_lock_bh(&xfrm6_tunnel_spi_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	x6spi = __xfrm6_tunnel_spi_lookup(net, saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 	if (x6spi) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 		refcount_inc(&x6spi->refcnt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 		spi = x6spi->spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	} else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 		spi = __xfrm6_tunnel_alloc_spi(net, saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	spin_unlock_bh(&xfrm6_tunnel_spi_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	return htonl(spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) EXPORT_SYMBOL(xfrm6_tunnel_alloc_spi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) static void x6spi_destroy_rcu(struct rcu_head *head)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	kmem_cache_free(xfrm6_tunnel_spi_kmem,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 			container_of(head, struct xfrm6_tunnel_spi, rcu_head));
^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 void xfrm6_tunnel_free_spi(struct net *net, xfrm_address_t *saddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	struct xfrm6_tunnel_spi *x6spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	struct hlist_node *n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	spin_lock_bh(&xfrm6_tunnel_spi_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 	hlist_for_each_entry_safe(x6spi, n,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 				  &xfrm6_tn->spi_byaddr[xfrm6_tunnel_spi_hash_byaddr(saddr)],
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 				  list_byaddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 		if (xfrm6_addr_equal(&x6spi->addr, saddr)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 			if (refcount_dec_and_test(&x6spi->refcnt)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 				hlist_del_rcu(&x6spi->list_byaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 				hlist_del_rcu(&x6spi->list_byspi);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 				call_rcu(&x6spi->rcu_head, x6spi_destroy_rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 			}
^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) 	spin_unlock_bh(&xfrm6_tunnel_spi_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	skb_push(skb, -skb_network_offset(skb));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	return 0;
^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) static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	return skb_network_header(skb)[IP6CB(skb)->nhoff];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) static int xfrm6_tunnel_rcv(struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 	struct net *net = dev_net(skb->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	const struct ipv6hdr *iph = ipv6_hdr(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	__be32 spi;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	spi = xfrm6_tunnel_spi_lookup(net, (const xfrm_address_t *)&iph->saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) static int xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 			    u8 type, u8 code, int offset, __be32 info)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 	/* xfrm6_tunnel native err handling */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	switch (type) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	case ICMPV6_DEST_UNREACH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		switch (code) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 		case ICMPV6_NOROUTE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 		case ICMPV6_ADM_PROHIBITED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		case ICMPV6_NOT_NEIGHBOUR:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		case ICMPV6_ADDR_UNREACH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 		case ICMPV6_PORT_UNREACH:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	case ICMPV6_PKT_TOOBIG:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	case ICMPV6_TIME_EXCEED:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 		switch (code) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		case ICMPV6_EXC_HOPLIMIT:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 		case ICMPV6_EXC_FRAGTIME:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 		default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 			break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 	case ICMPV6_PARAMPROB:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 		switch (code) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 		case ICMPV6_HDR_FIELD: break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 		case ICMPV6_UNK_NEXTHDR: break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 		case ICMPV6_UNK_OPTION: break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 	default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 		break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) static int xfrm6_tunnel_init_state(struct xfrm_state *x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	if (x->props.mode != XFRM_MODE_TUNNEL)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	if (x->encap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	x->props.header_len = sizeof(struct ipv6hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) static void xfrm6_tunnel_destroy(struct xfrm_state *x)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	struct net *net = xs_net(x);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	xfrm6_tunnel_free_spi(net, (xfrm_address_t *)&x->props.saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) static const struct xfrm_type xfrm6_tunnel_type = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	.description	= "IP6IP6",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 	.owner          = THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	.proto		= IPPROTO_IPV6,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	.init_state	= xfrm6_tunnel_init_state,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	.destructor	= xfrm6_tunnel_destroy,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 	.input		= xfrm6_tunnel_input,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 	.output		= xfrm6_tunnel_output,
^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) static struct xfrm6_tunnel xfrm6_tunnel_handler __read_mostly = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	.handler	= xfrm6_tunnel_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 	.err_handler	= xfrm6_tunnel_err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	.priority	= 3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) static struct xfrm6_tunnel xfrm46_tunnel_handler __read_mostly = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 	.handler	= xfrm6_tunnel_rcv,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	.err_handler	= xfrm6_tunnel_err,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	.priority	= 3,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) static int __net_init xfrm6_tunnel_net_init(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 	for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 		INIT_HLIST_HEAD(&xfrm6_tn->spi_byaddr[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 	for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		INIT_HLIST_HEAD(&xfrm6_tn->spi_byspi[i]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	xfrm6_tn->spi = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) static void __net_exit xfrm6_tunnel_net_exit(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 	struct xfrm6_tunnel_net *xfrm6_tn = xfrm6_tunnel_pernet(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 	unsigned int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	xfrm_flush_gc();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 	xfrm_state_flush(net, 0, false, true);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 	for (i = 0; i < XFRM6_TUNNEL_SPI_BYADDR_HSIZE; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		WARN_ON_ONCE(!hlist_empty(&xfrm6_tn->spi_byaddr[i]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 	for (i = 0; i < XFRM6_TUNNEL_SPI_BYSPI_HSIZE; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		WARN_ON_ONCE(!hlist_empty(&xfrm6_tn->spi_byspi[i]));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) static struct pernet_operations xfrm6_tunnel_net_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) 	.init	= xfrm6_tunnel_net_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 	.exit	= xfrm6_tunnel_net_exit,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) 	.id	= &xfrm6_tunnel_net_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) 	.size	= sizeof(struct xfrm6_tunnel_net),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) static int __init xfrm6_tunnel_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 	int rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) 	xfrm6_tunnel_spi_kmem = kmem_cache_create("xfrm6_tunnel_spi",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 						  sizeof(struct xfrm6_tunnel_spi),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) 						  0, SLAB_HWCACHE_ALIGN,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) 						  NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	if (!xfrm6_tunnel_spi_kmem)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 	rv = register_pernet_subsys(&xfrm6_tunnel_net_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	if (rv < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		goto out_pernet;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	rv = xfrm_register_type(&xfrm6_tunnel_type, AF_INET6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) 	if (rv < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 		goto out_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) 	rv = xfrm6_tunnel_register(&xfrm6_tunnel_handler, AF_INET6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 	if (rv < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) 		goto out_xfrm6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	rv = xfrm6_tunnel_register(&xfrm46_tunnel_handler, AF_INET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 	if (rv < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 		goto out_xfrm46;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) out_xfrm46:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) out_xfrm6:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) out_type:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 	unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) out_pernet:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) 	kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	return rv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) static void __exit xfrm6_tunnel_fini(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	xfrm6_tunnel_deregister(&xfrm46_tunnel_handler, AF_INET);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 	xfrm6_tunnel_deregister(&xfrm6_tunnel_handler, AF_INET6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 	xfrm_unregister_type(&xfrm6_tunnel_type, AF_INET6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	unregister_pernet_subsys(&xfrm6_tunnel_net_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 	/* Someone maybe has gotten the xfrm6_tunnel_spi.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	 * So need to wait it.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) 	rcu_barrier();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 	kmem_cache_destroy(xfrm6_tunnel_spi_kmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) module_init(xfrm6_tunnel_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) module_exit(xfrm6_tunnel_fini);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402) MODULE_ALIAS_XFRM_TYPE(AF_INET6, XFRM_PROTO_IPV6);