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![Jiri Bohac](/assets/img/avatar_default.png)
This reverts commitb515d26372
. Commitb515d26372
("xfrm: xfrm_state_mtu should return at least 1280 for ipv6") in v5.14 breaks the TCP MSS calculation in ipsec transport mode, resulting complete stalls of TCP connections. This happens when the (P)MTU is 1280 or slighly larger. The desired formula for the MSS is: MSS = (MTU - ESP_overhead) - IP header - TCP header However, the above commit clamps the (MTU - ESP_overhead) to a minimum of 1280, turning the formula into MSS = max(MTU - ESP overhead, 1280) - IP header - TCP header With the (P)MTU near 1280, the calculated MSS is too large and the resulting TCP packets never make it to the destination because they are over the actual PMTU. The above commit also causes suboptimal double fragmentation in xfrm tunnel mode, as described in https://lore.kernel.org/netdev/20210429202529.codhwpc7w6kbudug@dwarf.suse.cz/ The original problem the above commit was trying to fix is now fixed by commit6596a02295
("xfrm: fix MTU regression"). Signed-off-by: Jiri Bohac <jbohac@suse.cz> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2927 lines
68 KiB
C
2927 lines
68 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* xfrm_state.c
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*
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* Changes:
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* Mitsuru KANDA @USAGI
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* Kazunori MIYAZAWA @USAGI
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* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
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* IPv6 support
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* YOSHIFUJI Hideaki @USAGI
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* Split up af-specific functions
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* Derek Atkins <derek@ihtfp.com>
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* Add UDP Encapsulation
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*
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*/
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#include <linux/compat.h>
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#include <linux/workqueue.h>
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#include <net/xfrm.h>
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#include <linux/pfkeyv2.h>
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#include <linux/ipsec.h>
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#include <linux/module.h>
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#include <linux/cache.h>
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#include <linux/audit.h>
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#include <linux/uaccess.h>
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#include <linux/ktime.h>
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#include <linux/slab.h>
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#include <linux/interrupt.h>
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#include <linux/kernel.h>
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#include <crypto/aead.h>
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#include "xfrm_hash.h"
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#define xfrm_state_deref_prot(table, net) \
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rcu_dereference_protected((table), lockdep_is_held(&(net)->xfrm.xfrm_state_lock))
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static void xfrm_state_gc_task(struct work_struct *work);
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/* Each xfrm_state may be linked to two tables:
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1. Hash table by (spi,daddr,ah/esp) to find SA by SPI. (input,ctl)
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2. Hash table by (daddr,family,reqid) to find what SAs exist for given
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destination/tunnel endpoint. (output)
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*/
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static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024;
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static struct kmem_cache *xfrm_state_cache __ro_after_init;
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static DECLARE_WORK(xfrm_state_gc_work, xfrm_state_gc_task);
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static HLIST_HEAD(xfrm_state_gc_list);
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static inline bool xfrm_state_hold_rcu(struct xfrm_state __rcu *x)
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{
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return refcount_inc_not_zero(&x->refcnt);
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}
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static inline unsigned int xfrm_dst_hash(struct net *net,
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const xfrm_address_t *daddr,
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const xfrm_address_t *saddr,
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u32 reqid,
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unsigned short family)
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{
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return __xfrm_dst_hash(daddr, saddr, reqid, family, net->xfrm.state_hmask);
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}
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static inline unsigned int xfrm_src_hash(struct net *net,
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const xfrm_address_t *daddr,
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const xfrm_address_t *saddr,
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unsigned short family)
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{
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return __xfrm_src_hash(daddr, saddr, family, net->xfrm.state_hmask);
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}
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static inline unsigned int
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xfrm_spi_hash(struct net *net, const xfrm_address_t *daddr,
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__be32 spi, u8 proto, unsigned short family)
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{
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return __xfrm_spi_hash(daddr, spi, proto, family, net->xfrm.state_hmask);
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}
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static unsigned int xfrm_seq_hash(struct net *net, u32 seq)
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{
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return __xfrm_seq_hash(seq, net->xfrm.state_hmask);
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}
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static void xfrm_hash_transfer(struct hlist_head *list,
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struct hlist_head *ndsttable,
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struct hlist_head *nsrctable,
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struct hlist_head *nspitable,
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struct hlist_head *nseqtable,
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unsigned int nhashmask)
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{
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struct hlist_node *tmp;
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struct xfrm_state *x;
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hlist_for_each_entry_safe(x, tmp, list, bydst) {
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unsigned int h;
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h = __xfrm_dst_hash(&x->id.daddr, &x->props.saddr,
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x->props.reqid, x->props.family,
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nhashmask);
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hlist_add_head_rcu(&x->bydst, ndsttable + h);
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h = __xfrm_src_hash(&x->id.daddr, &x->props.saddr,
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x->props.family,
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nhashmask);
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hlist_add_head_rcu(&x->bysrc, nsrctable + h);
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if (x->id.spi) {
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h = __xfrm_spi_hash(&x->id.daddr, x->id.spi,
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x->id.proto, x->props.family,
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nhashmask);
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hlist_add_head_rcu(&x->byspi, nspitable + h);
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}
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if (x->km.seq) {
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h = __xfrm_seq_hash(x->km.seq, nhashmask);
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hlist_add_head_rcu(&x->byseq, nseqtable + h);
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}
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}
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}
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static unsigned long xfrm_hash_new_size(unsigned int state_hmask)
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{
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return ((state_hmask + 1) << 1) * sizeof(struct hlist_head);
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}
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static void xfrm_hash_resize(struct work_struct *work)
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{
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struct net *net = container_of(work, struct net, xfrm.state_hash_work);
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struct hlist_head *ndst, *nsrc, *nspi, *nseq, *odst, *osrc, *ospi, *oseq;
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unsigned long nsize, osize;
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unsigned int nhashmask, ohashmask;
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int i;
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nsize = xfrm_hash_new_size(net->xfrm.state_hmask);
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ndst = xfrm_hash_alloc(nsize);
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if (!ndst)
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return;
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nsrc = xfrm_hash_alloc(nsize);
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if (!nsrc) {
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xfrm_hash_free(ndst, nsize);
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return;
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}
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nspi = xfrm_hash_alloc(nsize);
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if (!nspi) {
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xfrm_hash_free(ndst, nsize);
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xfrm_hash_free(nsrc, nsize);
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return;
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}
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nseq = xfrm_hash_alloc(nsize);
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if (!nseq) {
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xfrm_hash_free(ndst, nsize);
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xfrm_hash_free(nsrc, nsize);
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xfrm_hash_free(nspi, nsize);
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return;
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}
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spin_lock_bh(&net->xfrm.xfrm_state_lock);
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write_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
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nhashmask = (nsize / sizeof(struct hlist_head)) - 1U;
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odst = xfrm_state_deref_prot(net->xfrm.state_bydst, net);
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for (i = net->xfrm.state_hmask; i >= 0; i--)
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xfrm_hash_transfer(odst + i, ndst, nsrc, nspi, nseq, nhashmask);
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osrc = xfrm_state_deref_prot(net->xfrm.state_bysrc, net);
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ospi = xfrm_state_deref_prot(net->xfrm.state_byspi, net);
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oseq = xfrm_state_deref_prot(net->xfrm.state_byseq, net);
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ohashmask = net->xfrm.state_hmask;
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rcu_assign_pointer(net->xfrm.state_bydst, ndst);
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rcu_assign_pointer(net->xfrm.state_bysrc, nsrc);
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rcu_assign_pointer(net->xfrm.state_byspi, nspi);
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rcu_assign_pointer(net->xfrm.state_byseq, nseq);
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net->xfrm.state_hmask = nhashmask;
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write_seqcount_end(&net->xfrm.xfrm_state_hash_generation);
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spin_unlock_bh(&net->xfrm.xfrm_state_lock);
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osize = (ohashmask + 1) * sizeof(struct hlist_head);
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synchronize_rcu();
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xfrm_hash_free(odst, osize);
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xfrm_hash_free(osrc, osize);
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xfrm_hash_free(ospi, osize);
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xfrm_hash_free(oseq, osize);
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}
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static DEFINE_SPINLOCK(xfrm_state_afinfo_lock);
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static struct xfrm_state_afinfo __rcu *xfrm_state_afinfo[NPROTO];
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static DEFINE_SPINLOCK(xfrm_state_gc_lock);
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int __xfrm_state_delete(struct xfrm_state *x);
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int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
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static bool km_is_alive(const struct km_event *c);
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void km_state_expired(struct xfrm_state *x, int hard, u32 portid);
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int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
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{
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struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
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int err = 0;
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if (!afinfo)
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return -EAFNOSUPPORT;
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#define X(afi, T, name) do { \
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WARN_ON((afi)->type_ ## name); \
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(afi)->type_ ## name = (T); \
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} while (0)
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switch (type->proto) {
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case IPPROTO_COMP:
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X(afinfo, type, comp);
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break;
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case IPPROTO_AH:
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X(afinfo, type, ah);
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break;
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case IPPROTO_ESP:
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X(afinfo, type, esp);
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break;
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case IPPROTO_IPIP:
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X(afinfo, type, ipip);
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break;
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case IPPROTO_DSTOPTS:
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X(afinfo, type, dstopts);
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break;
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case IPPROTO_ROUTING:
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X(afinfo, type, routing);
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break;
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case IPPROTO_IPV6:
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X(afinfo, type, ipip6);
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break;
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default:
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WARN_ON(1);
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err = -EPROTONOSUPPORT;
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break;
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}
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#undef X
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rcu_read_unlock();
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return err;
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}
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EXPORT_SYMBOL(xfrm_register_type);
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void xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
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{
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struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
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if (unlikely(afinfo == NULL))
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return;
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#define X(afi, T, name) do { \
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WARN_ON((afi)->type_ ## name != (T)); \
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(afi)->type_ ## name = NULL; \
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} while (0)
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switch (type->proto) {
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case IPPROTO_COMP:
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X(afinfo, type, comp);
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break;
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case IPPROTO_AH:
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X(afinfo, type, ah);
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break;
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case IPPROTO_ESP:
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X(afinfo, type, esp);
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break;
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case IPPROTO_IPIP:
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X(afinfo, type, ipip);
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break;
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case IPPROTO_DSTOPTS:
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X(afinfo, type, dstopts);
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break;
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case IPPROTO_ROUTING:
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X(afinfo, type, routing);
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break;
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case IPPROTO_IPV6:
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X(afinfo, type, ipip6);
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break;
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default:
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WARN_ON(1);
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break;
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}
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#undef X
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rcu_read_unlock();
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}
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EXPORT_SYMBOL(xfrm_unregister_type);
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static const struct xfrm_type *xfrm_get_type(u8 proto, unsigned short family)
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{
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const struct xfrm_type *type = NULL;
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struct xfrm_state_afinfo *afinfo;
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int modload_attempted = 0;
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retry:
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afinfo = xfrm_state_get_afinfo(family);
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if (unlikely(afinfo == NULL))
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return NULL;
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switch (proto) {
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case IPPROTO_COMP:
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type = afinfo->type_comp;
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break;
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case IPPROTO_AH:
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type = afinfo->type_ah;
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break;
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case IPPROTO_ESP:
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type = afinfo->type_esp;
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break;
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case IPPROTO_IPIP:
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type = afinfo->type_ipip;
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break;
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case IPPROTO_DSTOPTS:
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type = afinfo->type_dstopts;
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break;
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case IPPROTO_ROUTING:
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type = afinfo->type_routing;
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break;
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case IPPROTO_IPV6:
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type = afinfo->type_ipip6;
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break;
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default:
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break;
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}
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if (unlikely(type && !try_module_get(type->owner)))
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type = NULL;
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rcu_read_unlock();
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if (!type && !modload_attempted) {
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request_module("xfrm-type-%d-%d", family, proto);
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modload_attempted = 1;
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goto retry;
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}
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return type;
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}
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static void xfrm_put_type(const struct xfrm_type *type)
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{
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module_put(type->owner);
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}
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int xfrm_register_type_offload(const struct xfrm_type_offload *type,
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unsigned short family)
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{
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struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
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int err = 0;
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if (unlikely(afinfo == NULL))
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return -EAFNOSUPPORT;
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switch (type->proto) {
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case IPPROTO_ESP:
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WARN_ON(afinfo->type_offload_esp);
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afinfo->type_offload_esp = type;
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break;
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default:
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WARN_ON(1);
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err = -EPROTONOSUPPORT;
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break;
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}
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rcu_read_unlock();
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return err;
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}
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EXPORT_SYMBOL(xfrm_register_type_offload);
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void xfrm_unregister_type_offload(const struct xfrm_type_offload *type,
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unsigned short family)
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{
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struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
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if (unlikely(afinfo == NULL))
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return;
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switch (type->proto) {
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case IPPROTO_ESP:
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WARN_ON(afinfo->type_offload_esp != type);
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afinfo->type_offload_esp = NULL;
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break;
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default:
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WARN_ON(1);
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break;
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}
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rcu_read_unlock();
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}
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EXPORT_SYMBOL(xfrm_unregister_type_offload);
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static const struct xfrm_type_offload *
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xfrm_get_type_offload(u8 proto, unsigned short family, bool try_load)
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{
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const struct xfrm_type_offload *type = NULL;
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struct xfrm_state_afinfo *afinfo;
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retry:
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afinfo = xfrm_state_get_afinfo(family);
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if (unlikely(afinfo == NULL))
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return NULL;
|
|
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switch (proto) {
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case IPPROTO_ESP:
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type = afinfo->type_offload_esp;
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break;
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default:
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break;
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}
|
|
|
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if ((type && !try_module_get(type->owner)))
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type = NULL;
|
|
|
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rcu_read_unlock();
|
|
|
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if (!type && try_load) {
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request_module("xfrm-offload-%d-%d", family, proto);
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try_load = false;
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|
goto retry;
|
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}
|
|
|
|
return type;
|
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}
|
|
|
|
static void xfrm_put_type_offload(const struct xfrm_type_offload *type)
|
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{
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module_put(type->owner);
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}
|
|
|
|
static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
|
|
[XFRM_MODE_BEET] = {
|
|
.encap = XFRM_MODE_BEET,
|
|
.flags = XFRM_MODE_FLAG_TUNNEL,
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|
.family = AF_INET,
|
|
},
|
|
[XFRM_MODE_TRANSPORT] = {
|
|
.encap = XFRM_MODE_TRANSPORT,
|
|
.family = AF_INET,
|
|
},
|
|
[XFRM_MODE_TUNNEL] = {
|
|
.encap = XFRM_MODE_TUNNEL,
|
|
.flags = XFRM_MODE_FLAG_TUNNEL,
|
|
.family = AF_INET,
|
|
},
|
|
};
|
|
|
|
static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
|
|
[XFRM_MODE_BEET] = {
|
|
.encap = XFRM_MODE_BEET,
|
|
.flags = XFRM_MODE_FLAG_TUNNEL,
|
|
.family = AF_INET6,
|
|
},
|
|
[XFRM_MODE_ROUTEOPTIMIZATION] = {
|
|
.encap = XFRM_MODE_ROUTEOPTIMIZATION,
|
|
.family = AF_INET6,
|
|
},
|
|
[XFRM_MODE_TRANSPORT] = {
|
|
.encap = XFRM_MODE_TRANSPORT,
|
|
.family = AF_INET6,
|
|
},
|
|
[XFRM_MODE_TUNNEL] = {
|
|
.encap = XFRM_MODE_TUNNEL,
|
|
.flags = XFRM_MODE_FLAG_TUNNEL,
|
|
.family = AF_INET6,
|
|
},
|
|
};
|
|
|
|
static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
|
|
{
|
|
const struct xfrm_mode *mode;
|
|
|
|
if (unlikely(encap >= XFRM_MODE_MAX))
|
|
return NULL;
|
|
|
|
switch (family) {
|
|
case AF_INET:
|
|
mode = &xfrm4_mode_map[encap];
|
|
if (mode->family == family)
|
|
return mode;
|
|
break;
|
|
case AF_INET6:
|
|
mode = &xfrm6_mode_map[encap];
|
|
if (mode->family == family)
|
|
return mode;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void xfrm_state_free(struct xfrm_state *x)
|
|
{
|
|
kmem_cache_free(xfrm_state_cache, x);
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_free);
|
|
|
|
static void ___xfrm_state_destroy(struct xfrm_state *x)
|
|
{
|
|
hrtimer_cancel(&x->mtimer);
|
|
del_timer_sync(&x->rtimer);
|
|
kfree(x->aead);
|
|
kfree(x->aalg);
|
|
kfree(x->ealg);
|
|
kfree(x->calg);
|
|
kfree(x->encap);
|
|
kfree(x->coaddr);
|
|
kfree(x->replay_esn);
|
|
kfree(x->preplay_esn);
|
|
if (x->type_offload)
|
|
xfrm_put_type_offload(x->type_offload);
|
|
if (x->type) {
|
|
x->type->destructor(x);
|
|
xfrm_put_type(x->type);
|
|
}
|
|
if (x->xfrag.page)
|
|
put_page(x->xfrag.page);
|
|
xfrm_dev_state_free(x);
|
|
security_xfrm_state_free(x);
|
|
xfrm_state_free(x);
|
|
}
|
|
|
|
static void xfrm_state_gc_task(struct work_struct *work)
|
|
{
|
|
struct xfrm_state *x;
|
|
struct hlist_node *tmp;
|
|
struct hlist_head gc_list;
|
|
|
|
spin_lock_bh(&xfrm_state_gc_lock);
|
|
hlist_move_list(&xfrm_state_gc_list, &gc_list);
|
|
spin_unlock_bh(&xfrm_state_gc_lock);
|
|
|
|
synchronize_rcu();
|
|
|
|
hlist_for_each_entry_safe(x, tmp, &gc_list, gclist)
|
|
___xfrm_state_destroy(x);
|
|
}
|
|
|
|
static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
|
|
{
|
|
struct xfrm_state *x = container_of(me, struct xfrm_state, mtimer);
|
|
enum hrtimer_restart ret = HRTIMER_NORESTART;
|
|
time64_t now = ktime_get_real_seconds();
|
|
time64_t next = TIME64_MAX;
|
|
int warn = 0;
|
|
int err = 0;
|
|
|
|
spin_lock(&x->lock);
|
|
if (x->km.state == XFRM_STATE_DEAD)
|
|
goto out;
|
|
if (x->km.state == XFRM_STATE_EXPIRED)
|
|
goto expired;
|
|
if (x->lft.hard_add_expires_seconds) {
|
|
long tmo = x->lft.hard_add_expires_seconds +
|
|
x->curlft.add_time - now;
|
|
if (tmo <= 0) {
|
|
if (x->xflags & XFRM_SOFT_EXPIRE) {
|
|
/* enter hard expire without soft expire first?!
|
|
* setting a new date could trigger this.
|
|
* workaround: fix x->curflt.add_time by below:
|
|
*/
|
|
x->curlft.add_time = now - x->saved_tmo - 1;
|
|
tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
|
|
} else
|
|
goto expired;
|
|
}
|
|
if (tmo < next)
|
|
next = tmo;
|
|
}
|
|
if (x->lft.hard_use_expires_seconds) {
|
|
long tmo = x->lft.hard_use_expires_seconds +
|
|
(x->curlft.use_time ? : now) - now;
|
|
if (tmo <= 0)
|
|
goto expired;
|
|
if (tmo < next)
|
|
next = tmo;
|
|
}
|
|
if (x->km.dying)
|
|
goto resched;
|
|
if (x->lft.soft_add_expires_seconds) {
|
|
long tmo = x->lft.soft_add_expires_seconds +
|
|
x->curlft.add_time - now;
|
|
if (tmo <= 0) {
|
|
warn = 1;
|
|
x->xflags &= ~XFRM_SOFT_EXPIRE;
|
|
} else if (tmo < next) {
|
|
next = tmo;
|
|
x->xflags |= XFRM_SOFT_EXPIRE;
|
|
x->saved_tmo = tmo;
|
|
}
|
|
}
|
|
if (x->lft.soft_use_expires_seconds) {
|
|
long tmo = x->lft.soft_use_expires_seconds +
|
|
(x->curlft.use_time ? : now) - now;
|
|
if (tmo <= 0)
|
|
warn = 1;
|
|
else if (tmo < next)
|
|
next = tmo;
|
|
}
|
|
|
|
x->km.dying = warn;
|
|
if (warn)
|
|
km_state_expired(x, 0, 0);
|
|
resched:
|
|
if (next != TIME64_MAX) {
|
|
hrtimer_forward_now(&x->mtimer, ktime_set(next, 0));
|
|
ret = HRTIMER_RESTART;
|
|
}
|
|
|
|
goto out;
|
|
|
|
expired:
|
|
if (x->km.state == XFRM_STATE_ACQ && x->id.spi == 0)
|
|
x->km.state = XFRM_STATE_EXPIRED;
|
|
|
|
err = __xfrm_state_delete(x);
|
|
if (!err)
|
|
km_state_expired(x, 1, 0);
|
|
|
|
xfrm_audit_state_delete(x, err ? 0 : 1, true);
|
|
|
|
out:
|
|
spin_unlock(&x->lock);
|
|
return ret;
|
|
}
|
|
|
|
static void xfrm_replay_timer_handler(struct timer_list *t);
|
|
|
|
struct xfrm_state *xfrm_state_alloc(struct net *net)
|
|
{
|
|
struct xfrm_state *x;
|
|
|
|
x = kmem_cache_zalloc(xfrm_state_cache, GFP_ATOMIC);
|
|
|
|
if (x) {
|
|
write_pnet(&x->xs_net, net);
|
|
refcount_set(&x->refcnt, 1);
|
|
atomic_set(&x->tunnel_users, 0);
|
|
INIT_LIST_HEAD(&x->km.all);
|
|
INIT_HLIST_NODE(&x->bydst);
|
|
INIT_HLIST_NODE(&x->bysrc);
|
|
INIT_HLIST_NODE(&x->byspi);
|
|
INIT_HLIST_NODE(&x->byseq);
|
|
hrtimer_init(&x->mtimer, CLOCK_BOOTTIME, HRTIMER_MODE_ABS_SOFT);
|
|
x->mtimer.function = xfrm_timer_handler;
|
|
timer_setup(&x->rtimer, xfrm_replay_timer_handler, 0);
|
|
x->curlft.add_time = ktime_get_real_seconds();
|
|
x->lft.soft_byte_limit = XFRM_INF;
|
|
x->lft.soft_packet_limit = XFRM_INF;
|
|
x->lft.hard_byte_limit = XFRM_INF;
|
|
x->lft.hard_packet_limit = XFRM_INF;
|
|
x->replay_maxage = 0;
|
|
x->replay_maxdiff = 0;
|
|
spin_lock_init(&x->lock);
|
|
}
|
|
return x;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_alloc);
|
|
|
|
void __xfrm_state_destroy(struct xfrm_state *x, bool sync)
|
|
{
|
|
WARN_ON(x->km.state != XFRM_STATE_DEAD);
|
|
|
|
if (sync) {
|
|
synchronize_rcu();
|
|
___xfrm_state_destroy(x);
|
|
} else {
|
|
spin_lock_bh(&xfrm_state_gc_lock);
|
|
hlist_add_head(&x->gclist, &xfrm_state_gc_list);
|
|
spin_unlock_bh(&xfrm_state_gc_lock);
|
|
schedule_work(&xfrm_state_gc_work);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(__xfrm_state_destroy);
|
|
|
|
int __xfrm_state_delete(struct xfrm_state *x)
|
|
{
|
|
struct net *net = xs_net(x);
|
|
int err = -ESRCH;
|
|
|
|
if (x->km.state != XFRM_STATE_DEAD) {
|
|
x->km.state = XFRM_STATE_DEAD;
|
|
spin_lock(&net->xfrm.xfrm_state_lock);
|
|
list_del(&x->km.all);
|
|
hlist_del_rcu(&x->bydst);
|
|
hlist_del_rcu(&x->bysrc);
|
|
if (x->km.seq)
|
|
hlist_del_rcu(&x->byseq);
|
|
if (x->id.spi)
|
|
hlist_del_rcu(&x->byspi);
|
|
net->xfrm.state_num--;
|
|
spin_unlock(&net->xfrm.xfrm_state_lock);
|
|
|
|
if (x->encap_sk)
|
|
sock_put(rcu_dereference_raw(x->encap_sk));
|
|
|
|
xfrm_dev_state_delete(x);
|
|
|
|
/* All xfrm_state objects are created by xfrm_state_alloc.
|
|
* The xfrm_state_alloc call gives a reference, and that
|
|
* is what we are dropping here.
|
|
*/
|
|
xfrm_state_put(x);
|
|
err = 0;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(__xfrm_state_delete);
|
|
|
|
int xfrm_state_delete(struct xfrm_state *x)
|
|
{
|
|
int err;
|
|
|
|
spin_lock_bh(&x->lock);
|
|
err = __xfrm_state_delete(x);
|
|
spin_unlock_bh(&x->lock);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_delete);
|
|
|
|
#ifdef CONFIG_SECURITY_NETWORK_XFRM
|
|
static inline int
|
|
xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
|
|
{
|
|
int i, err = 0;
|
|
|
|
for (i = 0; i <= net->xfrm.state_hmask; i++) {
|
|
struct xfrm_state *x;
|
|
|
|
hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
|
|
if (xfrm_id_proto_match(x->id.proto, proto) &&
|
|
(err = security_xfrm_state_delete(x)) != 0) {
|
|
xfrm_audit_state_delete(x, 0, task_valid);
|
|
return err;
|
|
}
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline int
|
|
xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
|
|
{
|
|
int i, err = 0;
|
|
|
|
for (i = 0; i <= net->xfrm.state_hmask; i++) {
|
|
struct xfrm_state *x;
|
|
struct xfrm_state_offload *xso;
|
|
|
|
hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
|
|
xso = &x->xso;
|
|
|
|
if (xso->dev == dev &&
|
|
(err = security_xfrm_state_delete(x)) != 0) {
|
|
xfrm_audit_state_delete(x, 0, task_valid);
|
|
return err;
|
|
}
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
#else
|
|
static inline int
|
|
xfrm_state_flush_secctx_check(struct net *net, u8 proto, bool task_valid)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int
|
|
xfrm_dev_state_flush_secctx_check(struct net *net, struct net_device *dev, bool task_valid)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
int xfrm_state_flush(struct net *net, u8 proto, bool task_valid, bool sync)
|
|
{
|
|
int i, err = 0, cnt = 0;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
err = xfrm_state_flush_secctx_check(net, proto, task_valid);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = -ESRCH;
|
|
for (i = 0; i <= net->xfrm.state_hmask; i++) {
|
|
struct xfrm_state *x;
|
|
restart:
|
|
hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
|
|
if (!xfrm_state_kern(x) &&
|
|
xfrm_id_proto_match(x->id.proto, proto)) {
|
|
xfrm_state_hold(x);
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
|
|
err = xfrm_state_delete(x);
|
|
xfrm_audit_state_delete(x, err ? 0 : 1,
|
|
task_valid);
|
|
if (sync)
|
|
xfrm_state_put_sync(x);
|
|
else
|
|
xfrm_state_put(x);
|
|
if (!err)
|
|
cnt++;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
goto restart;
|
|
}
|
|
}
|
|
}
|
|
out:
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
if (cnt)
|
|
err = 0;
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_flush);
|
|
|
|
int xfrm_dev_state_flush(struct net *net, struct net_device *dev, bool task_valid)
|
|
{
|
|
int i, err = 0, cnt = 0;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
err = xfrm_dev_state_flush_secctx_check(net, dev, task_valid);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = -ESRCH;
|
|
for (i = 0; i <= net->xfrm.state_hmask; i++) {
|
|
struct xfrm_state *x;
|
|
struct xfrm_state_offload *xso;
|
|
restart:
|
|
hlist_for_each_entry(x, net->xfrm.state_bydst+i, bydst) {
|
|
xso = &x->xso;
|
|
|
|
if (!xfrm_state_kern(x) && xso->dev == dev) {
|
|
xfrm_state_hold(x);
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
|
|
err = xfrm_state_delete(x);
|
|
xfrm_audit_state_delete(x, err ? 0 : 1,
|
|
task_valid);
|
|
xfrm_state_put(x);
|
|
if (!err)
|
|
cnt++;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
goto restart;
|
|
}
|
|
}
|
|
}
|
|
if (cnt)
|
|
err = 0;
|
|
|
|
out:
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_dev_state_flush);
|
|
|
|
void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
|
|
{
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
si->sadcnt = net->xfrm.state_num;
|
|
si->sadhcnt = net->xfrm.state_hmask + 1;
|
|
si->sadhmcnt = xfrm_state_hashmax;
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
}
|
|
EXPORT_SYMBOL(xfrm_sad_getinfo);
|
|
|
|
static void
|
|
__xfrm4_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
|
|
{
|
|
const struct flowi4 *fl4 = &fl->u.ip4;
|
|
|
|
sel->daddr.a4 = fl4->daddr;
|
|
sel->saddr.a4 = fl4->saddr;
|
|
sel->dport = xfrm_flowi_dport(fl, &fl4->uli);
|
|
sel->dport_mask = htons(0xffff);
|
|
sel->sport = xfrm_flowi_sport(fl, &fl4->uli);
|
|
sel->sport_mask = htons(0xffff);
|
|
sel->family = AF_INET;
|
|
sel->prefixlen_d = 32;
|
|
sel->prefixlen_s = 32;
|
|
sel->proto = fl4->flowi4_proto;
|
|
sel->ifindex = fl4->flowi4_oif;
|
|
}
|
|
|
|
static void
|
|
__xfrm6_init_tempsel(struct xfrm_selector *sel, const struct flowi *fl)
|
|
{
|
|
const struct flowi6 *fl6 = &fl->u.ip6;
|
|
|
|
/* Initialize temporary selector matching only to current session. */
|
|
*(struct in6_addr *)&sel->daddr = fl6->daddr;
|
|
*(struct in6_addr *)&sel->saddr = fl6->saddr;
|
|
sel->dport = xfrm_flowi_dport(fl, &fl6->uli);
|
|
sel->dport_mask = htons(0xffff);
|
|
sel->sport = xfrm_flowi_sport(fl, &fl6->uli);
|
|
sel->sport_mask = htons(0xffff);
|
|
sel->family = AF_INET6;
|
|
sel->prefixlen_d = 128;
|
|
sel->prefixlen_s = 128;
|
|
sel->proto = fl6->flowi6_proto;
|
|
sel->ifindex = fl6->flowi6_oif;
|
|
}
|
|
|
|
static void
|
|
xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
|
|
const struct xfrm_tmpl *tmpl,
|
|
const xfrm_address_t *daddr, const xfrm_address_t *saddr,
|
|
unsigned short family)
|
|
{
|
|
switch (family) {
|
|
case AF_INET:
|
|
__xfrm4_init_tempsel(&x->sel, fl);
|
|
break;
|
|
case AF_INET6:
|
|
__xfrm6_init_tempsel(&x->sel, fl);
|
|
break;
|
|
}
|
|
|
|
x->id = tmpl->id;
|
|
|
|
switch (tmpl->encap_family) {
|
|
case AF_INET:
|
|
if (x->id.daddr.a4 == 0)
|
|
x->id.daddr.a4 = daddr->a4;
|
|
x->props.saddr = tmpl->saddr;
|
|
if (x->props.saddr.a4 == 0)
|
|
x->props.saddr.a4 = saddr->a4;
|
|
break;
|
|
case AF_INET6:
|
|
if (ipv6_addr_any((struct in6_addr *)&x->id.daddr))
|
|
memcpy(&x->id.daddr, daddr, sizeof(x->sel.daddr));
|
|
memcpy(&x->props.saddr, &tmpl->saddr, sizeof(x->props.saddr));
|
|
if (ipv6_addr_any((struct in6_addr *)&x->props.saddr))
|
|
memcpy(&x->props.saddr, saddr, sizeof(x->props.saddr));
|
|
break;
|
|
}
|
|
|
|
x->props.mode = tmpl->mode;
|
|
x->props.reqid = tmpl->reqid;
|
|
x->props.family = tmpl->encap_family;
|
|
}
|
|
|
|
static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
|
|
const xfrm_address_t *daddr,
|
|
__be32 spi, u8 proto,
|
|
unsigned short family)
|
|
{
|
|
unsigned int h = xfrm_spi_hash(net, daddr, spi, proto, family);
|
|
struct xfrm_state *x;
|
|
|
|
hlist_for_each_entry_rcu(x, net->xfrm.state_byspi + h, byspi) {
|
|
if (x->props.family != family ||
|
|
x->id.spi != spi ||
|
|
x->id.proto != proto ||
|
|
!xfrm_addr_equal(&x->id.daddr, daddr, family))
|
|
continue;
|
|
|
|
if ((mark & x->mark.m) != x->mark.v)
|
|
continue;
|
|
if (!xfrm_state_hold_rcu(x))
|
|
continue;
|
|
return x;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct xfrm_state *__xfrm_state_lookup_byaddr(struct net *net, u32 mark,
|
|
const xfrm_address_t *daddr,
|
|
const xfrm_address_t *saddr,
|
|
u8 proto, unsigned short family)
|
|
{
|
|
unsigned int h = xfrm_src_hash(net, daddr, saddr, family);
|
|
struct xfrm_state *x;
|
|
|
|
hlist_for_each_entry_rcu(x, net->xfrm.state_bysrc + h, bysrc) {
|
|
if (x->props.family != family ||
|
|
x->id.proto != proto ||
|
|
!xfrm_addr_equal(&x->id.daddr, daddr, family) ||
|
|
!xfrm_addr_equal(&x->props.saddr, saddr, family))
|
|
continue;
|
|
|
|
if ((mark & x->mark.m) != x->mark.v)
|
|
continue;
|
|
if (!xfrm_state_hold_rcu(x))
|
|
continue;
|
|
return x;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct xfrm_state *
|
|
__xfrm_state_locate(struct xfrm_state *x, int use_spi, int family)
|
|
{
|
|
struct net *net = xs_net(x);
|
|
u32 mark = x->mark.v & x->mark.m;
|
|
|
|
if (use_spi)
|
|
return __xfrm_state_lookup(net, mark, &x->id.daddr,
|
|
x->id.spi, x->id.proto, family);
|
|
else
|
|
return __xfrm_state_lookup_byaddr(net, mark,
|
|
&x->id.daddr,
|
|
&x->props.saddr,
|
|
x->id.proto, family);
|
|
}
|
|
|
|
static void xfrm_hash_grow_check(struct net *net, int have_hash_collision)
|
|
{
|
|
if (have_hash_collision &&
|
|
(net->xfrm.state_hmask + 1) < xfrm_state_hashmax &&
|
|
net->xfrm.state_num > net->xfrm.state_hmask)
|
|
schedule_work(&net->xfrm.state_hash_work);
|
|
}
|
|
|
|
static void xfrm_state_look_at(struct xfrm_policy *pol, struct xfrm_state *x,
|
|
const struct flowi *fl, unsigned short family,
|
|
struct xfrm_state **best, int *acq_in_progress,
|
|
int *error)
|
|
{
|
|
/* Resolution logic:
|
|
* 1. There is a valid state with matching selector. Done.
|
|
* 2. Valid state with inappropriate selector. Skip.
|
|
*
|
|
* Entering area of "sysdeps".
|
|
*
|
|
* 3. If state is not valid, selector is temporary, it selects
|
|
* only session which triggered previous resolution. Key
|
|
* manager will do something to install a state with proper
|
|
* selector.
|
|
*/
|
|
if (x->km.state == XFRM_STATE_VALID) {
|
|
if ((x->sel.family &&
|
|
(x->sel.family != family ||
|
|
!xfrm_selector_match(&x->sel, fl, family))) ||
|
|
!security_xfrm_state_pol_flow_match(x, pol,
|
|
&fl->u.__fl_common))
|
|
return;
|
|
|
|
if (!*best ||
|
|
(*best)->km.dying > x->km.dying ||
|
|
((*best)->km.dying == x->km.dying &&
|
|
(*best)->curlft.add_time < x->curlft.add_time))
|
|
*best = x;
|
|
} else if (x->km.state == XFRM_STATE_ACQ) {
|
|
*acq_in_progress = 1;
|
|
} else if (x->km.state == XFRM_STATE_ERROR ||
|
|
x->km.state == XFRM_STATE_EXPIRED) {
|
|
if ((!x->sel.family ||
|
|
(x->sel.family == family &&
|
|
xfrm_selector_match(&x->sel, fl, family))) &&
|
|
security_xfrm_state_pol_flow_match(x, pol,
|
|
&fl->u.__fl_common))
|
|
*error = -ESRCH;
|
|
}
|
|
}
|
|
|
|
struct xfrm_state *
|
|
xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr,
|
|
const struct flowi *fl, struct xfrm_tmpl *tmpl,
|
|
struct xfrm_policy *pol, int *err,
|
|
unsigned short family, u32 if_id)
|
|
{
|
|
static xfrm_address_t saddr_wildcard = { };
|
|
struct net *net = xp_net(pol);
|
|
unsigned int h, h_wildcard;
|
|
struct xfrm_state *x, *x0, *to_put;
|
|
int acquire_in_progress = 0;
|
|
int error = 0;
|
|
struct xfrm_state *best = NULL;
|
|
u32 mark = pol->mark.v & pol->mark.m;
|
|
unsigned short encap_family = tmpl->encap_family;
|
|
unsigned int sequence;
|
|
struct km_event c;
|
|
|
|
to_put = NULL;
|
|
|
|
sequence = read_seqcount_begin(&net->xfrm.xfrm_state_hash_generation);
|
|
|
|
rcu_read_lock();
|
|
h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);
|
|
hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {
|
|
if (x->props.family == encap_family &&
|
|
x->props.reqid == tmpl->reqid &&
|
|
(mark & x->mark.m) == x->mark.v &&
|
|
x->if_id == if_id &&
|
|
!(x->props.flags & XFRM_STATE_WILDRECV) &&
|
|
xfrm_state_addr_check(x, daddr, saddr, encap_family) &&
|
|
tmpl->mode == x->props.mode &&
|
|
tmpl->id.proto == x->id.proto &&
|
|
(tmpl->id.spi == x->id.spi || !tmpl->id.spi))
|
|
xfrm_state_look_at(pol, x, fl, family,
|
|
&best, &acquire_in_progress, &error);
|
|
}
|
|
if (best || acquire_in_progress)
|
|
goto found;
|
|
|
|
h_wildcard = xfrm_dst_hash(net, daddr, &saddr_wildcard, tmpl->reqid, encap_family);
|
|
hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h_wildcard, bydst) {
|
|
if (x->props.family == encap_family &&
|
|
x->props.reqid == tmpl->reqid &&
|
|
(mark & x->mark.m) == x->mark.v &&
|
|
x->if_id == if_id &&
|
|
!(x->props.flags & XFRM_STATE_WILDRECV) &&
|
|
xfrm_addr_equal(&x->id.daddr, daddr, encap_family) &&
|
|
tmpl->mode == x->props.mode &&
|
|
tmpl->id.proto == x->id.proto &&
|
|
(tmpl->id.spi == x->id.spi || !tmpl->id.spi))
|
|
xfrm_state_look_at(pol, x, fl, family,
|
|
&best, &acquire_in_progress, &error);
|
|
}
|
|
|
|
found:
|
|
x = best;
|
|
if (!x && !error && !acquire_in_progress) {
|
|
if (tmpl->id.spi &&
|
|
(x0 = __xfrm_state_lookup(net, mark, daddr, tmpl->id.spi,
|
|
tmpl->id.proto, encap_family)) != NULL) {
|
|
to_put = x0;
|
|
error = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
c.net = net;
|
|
/* If the KMs have no listeners (yet...), avoid allocating an SA
|
|
* for each and every packet - garbage collection might not
|
|
* handle the flood.
|
|
*/
|
|
if (!km_is_alive(&c)) {
|
|
error = -ESRCH;
|
|
goto out;
|
|
}
|
|
|
|
x = xfrm_state_alloc(net);
|
|
if (x == NULL) {
|
|
error = -ENOMEM;
|
|
goto out;
|
|
}
|
|
/* Initialize temporary state matching only
|
|
* to current session. */
|
|
xfrm_init_tempstate(x, fl, tmpl, daddr, saddr, family);
|
|
memcpy(&x->mark, &pol->mark, sizeof(x->mark));
|
|
x->if_id = if_id;
|
|
|
|
error = security_xfrm_state_alloc_acquire(x, pol->security, fl->flowi_secid);
|
|
if (error) {
|
|
x->km.state = XFRM_STATE_DEAD;
|
|
to_put = x;
|
|
x = NULL;
|
|
goto out;
|
|
}
|
|
|
|
if (km_query(x, tmpl, pol) == 0) {
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
x->km.state = XFRM_STATE_ACQ;
|
|
list_add(&x->km.all, &net->xfrm.state_all);
|
|
hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
|
|
h = xfrm_src_hash(net, daddr, saddr, encap_family);
|
|
hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
|
|
if (x->id.spi) {
|
|
h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, encap_family);
|
|
hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
|
|
}
|
|
if (x->km.seq) {
|
|
h = xfrm_seq_hash(net, x->km.seq);
|
|
hlist_add_head_rcu(&x->byseq, net->xfrm.state_byseq + h);
|
|
}
|
|
x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
|
|
hrtimer_start(&x->mtimer,
|
|
ktime_set(net->xfrm.sysctl_acq_expires, 0),
|
|
HRTIMER_MODE_REL_SOFT);
|
|
net->xfrm.state_num++;
|
|
xfrm_hash_grow_check(net, x->bydst.next != NULL);
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
} else {
|
|
x->km.state = XFRM_STATE_DEAD;
|
|
to_put = x;
|
|
x = NULL;
|
|
error = -ESRCH;
|
|
}
|
|
}
|
|
out:
|
|
if (x) {
|
|
if (!xfrm_state_hold_rcu(x)) {
|
|
*err = -EAGAIN;
|
|
x = NULL;
|
|
}
|
|
} else {
|
|
*err = acquire_in_progress ? -EAGAIN : error;
|
|
}
|
|
rcu_read_unlock();
|
|
if (to_put)
|
|
xfrm_state_put(to_put);
|
|
|
|
if (read_seqcount_retry(&net->xfrm.xfrm_state_hash_generation, sequence)) {
|
|
*err = -EAGAIN;
|
|
if (x) {
|
|
xfrm_state_put(x);
|
|
x = NULL;
|
|
}
|
|
}
|
|
|
|
return x;
|
|
}
|
|
|
|
struct xfrm_state *
|
|
xfrm_stateonly_find(struct net *net, u32 mark, u32 if_id,
|
|
xfrm_address_t *daddr, xfrm_address_t *saddr,
|
|
unsigned short family, u8 mode, u8 proto, u32 reqid)
|
|
{
|
|
unsigned int h;
|
|
struct xfrm_state *rx = NULL, *x = NULL;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
|
|
hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
|
|
if (x->props.family == family &&
|
|
x->props.reqid == reqid &&
|
|
(mark & x->mark.m) == x->mark.v &&
|
|
x->if_id == if_id &&
|
|
!(x->props.flags & XFRM_STATE_WILDRECV) &&
|
|
xfrm_state_addr_check(x, daddr, saddr, family) &&
|
|
mode == x->props.mode &&
|
|
proto == x->id.proto &&
|
|
x->km.state == XFRM_STATE_VALID) {
|
|
rx = x;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (rx)
|
|
xfrm_state_hold(rx);
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
|
|
|
|
return rx;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_stateonly_find);
|
|
|
|
struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
|
|
unsigned short family)
|
|
{
|
|
struct xfrm_state *x;
|
|
struct xfrm_state_walk *w;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
list_for_each_entry(w, &net->xfrm.state_all, all) {
|
|
x = container_of(w, struct xfrm_state, km);
|
|
if (x->props.family != family ||
|
|
x->id.spi != spi)
|
|
continue;
|
|
|
|
xfrm_state_hold(x);
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
return x;
|
|
}
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_lookup_byspi);
|
|
|
|
static void __xfrm_state_insert(struct xfrm_state *x)
|
|
{
|
|
struct net *net = xs_net(x);
|
|
unsigned int h;
|
|
|
|
list_add(&x->km.all, &net->xfrm.state_all);
|
|
|
|
h = xfrm_dst_hash(net, &x->id.daddr, &x->props.saddr,
|
|
x->props.reqid, x->props.family);
|
|
hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
|
|
|
|
h = xfrm_src_hash(net, &x->id.daddr, &x->props.saddr, x->props.family);
|
|
hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
|
|
|
|
if (x->id.spi) {
|
|
h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto,
|
|
x->props.family);
|
|
|
|
hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
|
|
}
|
|
|
|
if (x->km.seq) {
|
|
h = xfrm_seq_hash(net, x->km.seq);
|
|
|
|
hlist_add_head_rcu(&x->byseq, net->xfrm.state_byseq + h);
|
|
}
|
|
|
|
hrtimer_start(&x->mtimer, ktime_set(1, 0), HRTIMER_MODE_REL_SOFT);
|
|
if (x->replay_maxage)
|
|
mod_timer(&x->rtimer, jiffies + x->replay_maxage);
|
|
|
|
net->xfrm.state_num++;
|
|
|
|
xfrm_hash_grow_check(net, x->bydst.next != NULL);
|
|
}
|
|
|
|
/* net->xfrm.xfrm_state_lock is held */
|
|
static void __xfrm_state_bump_genids(struct xfrm_state *xnew)
|
|
{
|
|
struct net *net = xs_net(xnew);
|
|
unsigned short family = xnew->props.family;
|
|
u32 reqid = xnew->props.reqid;
|
|
struct xfrm_state *x;
|
|
unsigned int h;
|
|
u32 mark = xnew->mark.v & xnew->mark.m;
|
|
u32 if_id = xnew->if_id;
|
|
|
|
h = xfrm_dst_hash(net, &xnew->id.daddr, &xnew->props.saddr, reqid, family);
|
|
hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
|
|
if (x->props.family == family &&
|
|
x->props.reqid == reqid &&
|
|
x->if_id == if_id &&
|
|
(mark & x->mark.m) == x->mark.v &&
|
|
xfrm_addr_equal(&x->id.daddr, &xnew->id.daddr, family) &&
|
|
xfrm_addr_equal(&x->props.saddr, &xnew->props.saddr, family))
|
|
x->genid++;
|
|
}
|
|
}
|
|
|
|
void xfrm_state_insert(struct xfrm_state *x)
|
|
{
|
|
struct net *net = xs_net(x);
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
__xfrm_state_bump_genids(x);
|
|
__xfrm_state_insert(x);
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_insert);
|
|
|
|
/* net->xfrm.xfrm_state_lock is held */
|
|
static struct xfrm_state *__find_acq_core(struct net *net,
|
|
const struct xfrm_mark *m,
|
|
unsigned short family, u8 mode,
|
|
u32 reqid, u32 if_id, u8 proto,
|
|
const xfrm_address_t *daddr,
|
|
const xfrm_address_t *saddr,
|
|
int create)
|
|
{
|
|
unsigned int h = xfrm_dst_hash(net, daddr, saddr, reqid, family);
|
|
struct xfrm_state *x;
|
|
u32 mark = m->v & m->m;
|
|
|
|
hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
|
|
if (x->props.reqid != reqid ||
|
|
x->props.mode != mode ||
|
|
x->props.family != family ||
|
|
x->km.state != XFRM_STATE_ACQ ||
|
|
x->id.spi != 0 ||
|
|
x->id.proto != proto ||
|
|
(mark & x->mark.m) != x->mark.v ||
|
|
!xfrm_addr_equal(&x->id.daddr, daddr, family) ||
|
|
!xfrm_addr_equal(&x->props.saddr, saddr, family))
|
|
continue;
|
|
|
|
xfrm_state_hold(x);
|
|
return x;
|
|
}
|
|
|
|
if (!create)
|
|
return NULL;
|
|
|
|
x = xfrm_state_alloc(net);
|
|
if (likely(x)) {
|
|
switch (family) {
|
|
case AF_INET:
|
|
x->sel.daddr.a4 = daddr->a4;
|
|
x->sel.saddr.a4 = saddr->a4;
|
|
x->sel.prefixlen_d = 32;
|
|
x->sel.prefixlen_s = 32;
|
|
x->props.saddr.a4 = saddr->a4;
|
|
x->id.daddr.a4 = daddr->a4;
|
|
break;
|
|
|
|
case AF_INET6:
|
|
x->sel.daddr.in6 = daddr->in6;
|
|
x->sel.saddr.in6 = saddr->in6;
|
|
x->sel.prefixlen_d = 128;
|
|
x->sel.prefixlen_s = 128;
|
|
x->props.saddr.in6 = saddr->in6;
|
|
x->id.daddr.in6 = daddr->in6;
|
|
break;
|
|
}
|
|
|
|
x->km.state = XFRM_STATE_ACQ;
|
|
x->id.proto = proto;
|
|
x->props.family = family;
|
|
x->props.mode = mode;
|
|
x->props.reqid = reqid;
|
|
x->if_id = if_id;
|
|
x->mark.v = m->v;
|
|
x->mark.m = m->m;
|
|
x->lft.hard_add_expires_seconds = net->xfrm.sysctl_acq_expires;
|
|
xfrm_state_hold(x);
|
|
hrtimer_start(&x->mtimer,
|
|
ktime_set(net->xfrm.sysctl_acq_expires, 0),
|
|
HRTIMER_MODE_REL_SOFT);
|
|
list_add(&x->km.all, &net->xfrm.state_all);
|
|
hlist_add_head_rcu(&x->bydst, net->xfrm.state_bydst + h);
|
|
h = xfrm_src_hash(net, daddr, saddr, family);
|
|
hlist_add_head_rcu(&x->bysrc, net->xfrm.state_bysrc + h);
|
|
|
|
net->xfrm.state_num++;
|
|
|
|
xfrm_hash_grow_check(net, x->bydst.next != NULL);
|
|
}
|
|
|
|
return x;
|
|
}
|
|
|
|
static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq);
|
|
|
|
int xfrm_state_add(struct xfrm_state *x)
|
|
{
|
|
struct net *net = xs_net(x);
|
|
struct xfrm_state *x1, *to_put;
|
|
int family;
|
|
int err;
|
|
u32 mark = x->mark.v & x->mark.m;
|
|
int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
|
|
|
|
family = x->props.family;
|
|
|
|
to_put = NULL;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
|
|
x1 = __xfrm_state_locate(x, use_spi, family);
|
|
if (x1) {
|
|
to_put = x1;
|
|
x1 = NULL;
|
|
err = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
if (use_spi && x->km.seq) {
|
|
x1 = __xfrm_find_acq_byseq(net, mark, x->km.seq);
|
|
if (x1 && ((x1->id.proto != x->id.proto) ||
|
|
!xfrm_addr_equal(&x1->id.daddr, &x->id.daddr, family))) {
|
|
to_put = x1;
|
|
x1 = NULL;
|
|
}
|
|
}
|
|
|
|
if (use_spi && !x1)
|
|
x1 = __find_acq_core(net, &x->mark, family, x->props.mode,
|
|
x->props.reqid, x->if_id, x->id.proto,
|
|
&x->id.daddr, &x->props.saddr, 0);
|
|
|
|
__xfrm_state_bump_genids(x);
|
|
__xfrm_state_insert(x);
|
|
err = 0;
|
|
|
|
out:
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
|
|
if (x1) {
|
|
xfrm_state_delete(x1);
|
|
xfrm_state_put(x1);
|
|
}
|
|
|
|
if (to_put)
|
|
xfrm_state_put(to_put);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_add);
|
|
|
|
#ifdef CONFIG_XFRM_MIGRATE
|
|
static inline int clone_security(struct xfrm_state *x, struct xfrm_sec_ctx *security)
|
|
{
|
|
struct xfrm_user_sec_ctx *uctx;
|
|
int size = sizeof(*uctx) + security->ctx_len;
|
|
int err;
|
|
|
|
uctx = kmalloc(size, GFP_KERNEL);
|
|
if (!uctx)
|
|
return -ENOMEM;
|
|
|
|
uctx->exttype = XFRMA_SEC_CTX;
|
|
uctx->len = size;
|
|
uctx->ctx_doi = security->ctx_doi;
|
|
uctx->ctx_alg = security->ctx_alg;
|
|
uctx->ctx_len = security->ctx_len;
|
|
memcpy(uctx + 1, security->ctx_str, security->ctx_len);
|
|
err = security_xfrm_state_alloc(x, uctx);
|
|
kfree(uctx);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct xfrm_state *xfrm_state_clone(struct xfrm_state *orig,
|
|
struct xfrm_encap_tmpl *encap)
|
|
{
|
|
struct net *net = xs_net(orig);
|
|
struct xfrm_state *x = xfrm_state_alloc(net);
|
|
if (!x)
|
|
goto out;
|
|
|
|
memcpy(&x->id, &orig->id, sizeof(x->id));
|
|
memcpy(&x->sel, &orig->sel, sizeof(x->sel));
|
|
memcpy(&x->lft, &orig->lft, sizeof(x->lft));
|
|
x->props.mode = orig->props.mode;
|
|
x->props.replay_window = orig->props.replay_window;
|
|
x->props.reqid = orig->props.reqid;
|
|
x->props.family = orig->props.family;
|
|
x->props.saddr = orig->props.saddr;
|
|
|
|
if (orig->aalg) {
|
|
x->aalg = xfrm_algo_auth_clone(orig->aalg);
|
|
if (!x->aalg)
|
|
goto error;
|
|
}
|
|
x->props.aalgo = orig->props.aalgo;
|
|
|
|
if (orig->aead) {
|
|
x->aead = xfrm_algo_aead_clone(orig->aead);
|
|
x->geniv = orig->geniv;
|
|
if (!x->aead)
|
|
goto error;
|
|
}
|
|
if (orig->ealg) {
|
|
x->ealg = xfrm_algo_clone(orig->ealg);
|
|
if (!x->ealg)
|
|
goto error;
|
|
}
|
|
x->props.ealgo = orig->props.ealgo;
|
|
|
|
if (orig->calg) {
|
|
x->calg = xfrm_algo_clone(orig->calg);
|
|
if (!x->calg)
|
|
goto error;
|
|
}
|
|
x->props.calgo = orig->props.calgo;
|
|
|
|
if (encap || orig->encap) {
|
|
if (encap)
|
|
x->encap = kmemdup(encap, sizeof(*x->encap),
|
|
GFP_KERNEL);
|
|
else
|
|
x->encap = kmemdup(orig->encap, sizeof(*x->encap),
|
|
GFP_KERNEL);
|
|
|
|
if (!x->encap)
|
|
goto error;
|
|
}
|
|
|
|
if (orig->security)
|
|
if (clone_security(x, orig->security))
|
|
goto error;
|
|
|
|
if (orig->coaddr) {
|
|
x->coaddr = kmemdup(orig->coaddr, sizeof(*x->coaddr),
|
|
GFP_KERNEL);
|
|
if (!x->coaddr)
|
|
goto error;
|
|
}
|
|
|
|
if (orig->replay_esn) {
|
|
if (xfrm_replay_clone(x, orig))
|
|
goto error;
|
|
}
|
|
|
|
memcpy(&x->mark, &orig->mark, sizeof(x->mark));
|
|
memcpy(&x->props.smark, &orig->props.smark, sizeof(x->props.smark));
|
|
|
|
x->props.flags = orig->props.flags;
|
|
x->props.extra_flags = orig->props.extra_flags;
|
|
|
|
x->if_id = orig->if_id;
|
|
x->tfcpad = orig->tfcpad;
|
|
x->replay_maxdiff = orig->replay_maxdiff;
|
|
x->replay_maxage = orig->replay_maxage;
|
|
memcpy(&x->curlft, &orig->curlft, sizeof(x->curlft));
|
|
x->km.state = orig->km.state;
|
|
x->km.seq = orig->km.seq;
|
|
x->replay = orig->replay;
|
|
x->preplay = orig->preplay;
|
|
x->mapping_maxage = orig->mapping_maxage;
|
|
x->new_mapping = 0;
|
|
x->new_mapping_sport = 0;
|
|
|
|
return x;
|
|
|
|
error:
|
|
xfrm_state_put(x);
|
|
out:
|
|
return NULL;
|
|
}
|
|
|
|
struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net,
|
|
u32 if_id)
|
|
{
|
|
unsigned int h;
|
|
struct xfrm_state *x = NULL;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
|
|
if (m->reqid) {
|
|
h = xfrm_dst_hash(net, &m->old_daddr, &m->old_saddr,
|
|
m->reqid, m->old_family);
|
|
hlist_for_each_entry(x, net->xfrm.state_bydst+h, bydst) {
|
|
if (x->props.mode != m->mode ||
|
|
x->id.proto != m->proto)
|
|
continue;
|
|
if (m->reqid && x->props.reqid != m->reqid)
|
|
continue;
|
|
if (if_id != 0 && x->if_id != if_id)
|
|
continue;
|
|
if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
|
|
m->old_family) ||
|
|
!xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
|
|
m->old_family))
|
|
continue;
|
|
xfrm_state_hold(x);
|
|
break;
|
|
}
|
|
} else {
|
|
h = xfrm_src_hash(net, &m->old_daddr, &m->old_saddr,
|
|
m->old_family);
|
|
hlist_for_each_entry(x, net->xfrm.state_bysrc+h, bysrc) {
|
|
if (x->props.mode != m->mode ||
|
|
x->id.proto != m->proto)
|
|
continue;
|
|
if (if_id != 0 && x->if_id != if_id)
|
|
continue;
|
|
if (!xfrm_addr_equal(&x->id.daddr, &m->old_daddr,
|
|
m->old_family) ||
|
|
!xfrm_addr_equal(&x->props.saddr, &m->old_saddr,
|
|
m->old_family))
|
|
continue;
|
|
xfrm_state_hold(x);
|
|
break;
|
|
}
|
|
}
|
|
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
|
|
return x;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_migrate_state_find);
|
|
|
|
struct xfrm_state *xfrm_state_migrate(struct xfrm_state *x,
|
|
struct xfrm_migrate *m,
|
|
struct xfrm_encap_tmpl *encap)
|
|
{
|
|
struct xfrm_state *xc;
|
|
|
|
xc = xfrm_state_clone(x, encap);
|
|
if (!xc)
|
|
return NULL;
|
|
|
|
xc->props.family = m->new_family;
|
|
|
|
if (xfrm_init_state(xc) < 0)
|
|
goto error;
|
|
|
|
memcpy(&xc->id.daddr, &m->new_daddr, sizeof(xc->id.daddr));
|
|
memcpy(&xc->props.saddr, &m->new_saddr, sizeof(xc->props.saddr));
|
|
|
|
/* add state */
|
|
if (xfrm_addr_equal(&x->id.daddr, &m->new_daddr, m->new_family)) {
|
|
/* a care is needed when the destination address of the
|
|
state is to be updated as it is a part of triplet */
|
|
xfrm_state_insert(xc);
|
|
} else {
|
|
if (xfrm_state_add(xc) < 0)
|
|
goto error;
|
|
}
|
|
|
|
return xc;
|
|
error:
|
|
xfrm_state_put(xc);
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_migrate);
|
|
#endif
|
|
|
|
int xfrm_state_update(struct xfrm_state *x)
|
|
{
|
|
struct xfrm_state *x1, *to_put;
|
|
int err;
|
|
int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
|
|
struct net *net = xs_net(x);
|
|
|
|
to_put = NULL;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
x1 = __xfrm_state_locate(x, use_spi, x->props.family);
|
|
|
|
err = -ESRCH;
|
|
if (!x1)
|
|
goto out;
|
|
|
|
if (xfrm_state_kern(x1)) {
|
|
to_put = x1;
|
|
err = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
if (x1->km.state == XFRM_STATE_ACQ) {
|
|
__xfrm_state_insert(x);
|
|
x = NULL;
|
|
}
|
|
err = 0;
|
|
|
|
out:
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
|
|
if (to_put)
|
|
xfrm_state_put(to_put);
|
|
|
|
if (err)
|
|
return err;
|
|
|
|
if (!x) {
|
|
xfrm_state_delete(x1);
|
|
xfrm_state_put(x1);
|
|
return 0;
|
|
}
|
|
|
|
err = -EINVAL;
|
|
spin_lock_bh(&x1->lock);
|
|
if (likely(x1->km.state == XFRM_STATE_VALID)) {
|
|
if (x->encap && x1->encap &&
|
|
x->encap->encap_type == x1->encap->encap_type)
|
|
memcpy(x1->encap, x->encap, sizeof(*x1->encap));
|
|
else if (x->encap || x1->encap)
|
|
goto fail;
|
|
|
|
if (x->coaddr && x1->coaddr) {
|
|
memcpy(x1->coaddr, x->coaddr, sizeof(*x1->coaddr));
|
|
}
|
|
if (!use_spi && memcmp(&x1->sel, &x->sel, sizeof(x1->sel)))
|
|
memcpy(&x1->sel, &x->sel, sizeof(x1->sel));
|
|
memcpy(&x1->lft, &x->lft, sizeof(x1->lft));
|
|
x1->km.dying = 0;
|
|
|
|
hrtimer_start(&x1->mtimer, ktime_set(1, 0),
|
|
HRTIMER_MODE_REL_SOFT);
|
|
if (x1->curlft.use_time)
|
|
xfrm_state_check_expire(x1);
|
|
|
|
if (x->props.smark.m || x->props.smark.v || x->if_id) {
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
|
|
if (x->props.smark.m || x->props.smark.v)
|
|
x1->props.smark = x->props.smark;
|
|
|
|
if (x->if_id)
|
|
x1->if_id = x->if_id;
|
|
|
|
__xfrm_state_bump_genids(x1);
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
}
|
|
|
|
err = 0;
|
|
x->km.state = XFRM_STATE_DEAD;
|
|
__xfrm_state_put(x);
|
|
}
|
|
|
|
fail:
|
|
spin_unlock_bh(&x1->lock);
|
|
|
|
xfrm_state_put(x1);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_update);
|
|
|
|
int xfrm_state_check_expire(struct xfrm_state *x)
|
|
{
|
|
if (!x->curlft.use_time)
|
|
x->curlft.use_time = ktime_get_real_seconds();
|
|
|
|
if (x->curlft.bytes >= x->lft.hard_byte_limit ||
|
|
x->curlft.packets >= x->lft.hard_packet_limit) {
|
|
x->km.state = XFRM_STATE_EXPIRED;
|
|
hrtimer_start(&x->mtimer, 0, HRTIMER_MODE_REL_SOFT);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (!x->km.dying &&
|
|
(x->curlft.bytes >= x->lft.soft_byte_limit ||
|
|
x->curlft.packets >= x->lft.soft_packet_limit)) {
|
|
x->km.dying = 1;
|
|
km_state_expired(x, 0, 0);
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_check_expire);
|
|
|
|
struct xfrm_state *
|
|
xfrm_state_lookup(struct net *net, u32 mark, const xfrm_address_t *daddr, __be32 spi,
|
|
u8 proto, unsigned short family)
|
|
{
|
|
struct xfrm_state *x;
|
|
|
|
rcu_read_lock();
|
|
x = __xfrm_state_lookup(net, mark, daddr, spi, proto, family);
|
|
rcu_read_unlock();
|
|
return x;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_lookup);
|
|
|
|
struct xfrm_state *
|
|
xfrm_state_lookup_byaddr(struct net *net, u32 mark,
|
|
const xfrm_address_t *daddr, const xfrm_address_t *saddr,
|
|
u8 proto, unsigned short family)
|
|
{
|
|
struct xfrm_state *x;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
x = __xfrm_state_lookup_byaddr(net, mark, daddr, saddr, proto, family);
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
return x;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
|
|
|
|
struct xfrm_state *
|
|
xfrm_find_acq(struct net *net, const struct xfrm_mark *mark, u8 mode, u32 reqid,
|
|
u32 if_id, u8 proto, const xfrm_address_t *daddr,
|
|
const xfrm_address_t *saddr, int create, unsigned short family)
|
|
{
|
|
struct xfrm_state *x;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
x = __find_acq_core(net, mark, family, mode, reqid, if_id, proto, daddr, saddr, create);
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
|
|
return x;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_find_acq);
|
|
|
|
#ifdef CONFIG_XFRM_SUB_POLICY
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
/* distribution counting sort function for xfrm_state and xfrm_tmpl */
|
|
static void
|
|
__xfrm6_sort(void **dst, void **src, int n,
|
|
int (*cmp)(const void *p), int maxclass)
|
|
{
|
|
int count[XFRM_MAX_DEPTH] = { };
|
|
int class[XFRM_MAX_DEPTH];
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++) {
|
|
int c = cmp(src[i]);
|
|
|
|
class[i] = c;
|
|
count[c]++;
|
|
}
|
|
|
|
for (i = 2; i < maxclass; i++)
|
|
count[i] += count[i - 1];
|
|
|
|
for (i = 0; i < n; i++) {
|
|
dst[count[class[i] - 1]++] = src[i];
|
|
src[i] = NULL;
|
|
}
|
|
}
|
|
|
|
/* Rule for xfrm_state:
|
|
*
|
|
* rule 1: select IPsec transport except AH
|
|
* rule 2: select MIPv6 RO or inbound trigger
|
|
* rule 3: select IPsec transport AH
|
|
* rule 4: select IPsec tunnel
|
|
* rule 5: others
|
|
*/
|
|
static int __xfrm6_state_sort_cmp(const void *p)
|
|
{
|
|
const struct xfrm_state *v = p;
|
|
|
|
switch (v->props.mode) {
|
|
case XFRM_MODE_TRANSPORT:
|
|
if (v->id.proto != IPPROTO_AH)
|
|
return 1;
|
|
else
|
|
return 3;
|
|
#if IS_ENABLED(CONFIG_IPV6_MIP6)
|
|
case XFRM_MODE_ROUTEOPTIMIZATION:
|
|
case XFRM_MODE_IN_TRIGGER:
|
|
return 2;
|
|
#endif
|
|
case XFRM_MODE_TUNNEL:
|
|
case XFRM_MODE_BEET:
|
|
return 4;
|
|
}
|
|
return 5;
|
|
}
|
|
|
|
/* Rule for xfrm_tmpl:
|
|
*
|
|
* rule 1: select IPsec transport
|
|
* rule 2: select MIPv6 RO or inbound trigger
|
|
* rule 3: select IPsec tunnel
|
|
* rule 4: others
|
|
*/
|
|
static int __xfrm6_tmpl_sort_cmp(const void *p)
|
|
{
|
|
const struct xfrm_tmpl *v = p;
|
|
|
|
switch (v->mode) {
|
|
case XFRM_MODE_TRANSPORT:
|
|
return 1;
|
|
#if IS_ENABLED(CONFIG_IPV6_MIP6)
|
|
case XFRM_MODE_ROUTEOPTIMIZATION:
|
|
case XFRM_MODE_IN_TRIGGER:
|
|
return 2;
|
|
#endif
|
|
case XFRM_MODE_TUNNEL:
|
|
case XFRM_MODE_BEET:
|
|
return 3;
|
|
}
|
|
return 4;
|
|
}
|
|
#else
|
|
static inline int __xfrm6_state_sort_cmp(const void *p) { return 5; }
|
|
static inline int __xfrm6_tmpl_sort_cmp(const void *p) { return 4; }
|
|
|
|
static inline void
|
|
__xfrm6_sort(void **dst, void **src, int n,
|
|
int (*cmp)(const void *p), int maxclass)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < n; i++)
|
|
dst[i] = src[i];
|
|
}
|
|
#endif /* CONFIG_IPV6 */
|
|
|
|
void
|
|
xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
|
|
unsigned short family)
|
|
{
|
|
int i;
|
|
|
|
if (family == AF_INET6)
|
|
__xfrm6_sort((void **)dst, (void **)src, n,
|
|
__xfrm6_tmpl_sort_cmp, 5);
|
|
else
|
|
for (i = 0; i < n; i++)
|
|
dst[i] = src[i];
|
|
}
|
|
|
|
void
|
|
xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
|
|
unsigned short family)
|
|
{
|
|
int i;
|
|
|
|
if (family == AF_INET6)
|
|
__xfrm6_sort((void **)dst, (void **)src, n,
|
|
__xfrm6_state_sort_cmp, 6);
|
|
else
|
|
for (i = 0; i < n; i++)
|
|
dst[i] = src[i];
|
|
}
|
|
#endif
|
|
|
|
/* Silly enough, but I'm lazy to build resolution list */
|
|
|
|
static struct xfrm_state *__xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
|
|
{
|
|
unsigned int h = xfrm_seq_hash(net, seq);
|
|
struct xfrm_state *x;
|
|
|
|
hlist_for_each_entry_rcu(x, net->xfrm.state_byseq + h, byseq) {
|
|
if (x->km.seq == seq &&
|
|
(mark & x->mark.m) == x->mark.v &&
|
|
x->km.state == XFRM_STATE_ACQ) {
|
|
xfrm_state_hold(x);
|
|
return x;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 mark, u32 seq)
|
|
{
|
|
struct xfrm_state *x;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
x = __xfrm_find_acq_byseq(net, mark, seq);
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
return x;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_find_acq_byseq);
|
|
|
|
u32 xfrm_get_acqseq(void)
|
|
{
|
|
u32 res;
|
|
static atomic_t acqseq;
|
|
|
|
do {
|
|
res = atomic_inc_return(&acqseq);
|
|
} while (!res);
|
|
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_get_acqseq);
|
|
|
|
int verify_spi_info(u8 proto, u32 min, u32 max)
|
|
{
|
|
switch (proto) {
|
|
case IPPROTO_AH:
|
|
case IPPROTO_ESP:
|
|
break;
|
|
|
|
case IPPROTO_COMP:
|
|
/* IPCOMP spi is 16-bits. */
|
|
if (max >= 0x10000)
|
|
return -EINVAL;
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (min > max)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(verify_spi_info);
|
|
|
|
int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
|
|
{
|
|
struct net *net = xs_net(x);
|
|
unsigned int h;
|
|
struct xfrm_state *x0;
|
|
int err = -ENOENT;
|
|
__be32 minspi = htonl(low);
|
|
__be32 maxspi = htonl(high);
|
|
__be32 newspi = 0;
|
|
u32 mark = x->mark.v & x->mark.m;
|
|
|
|
spin_lock_bh(&x->lock);
|
|
if (x->km.state == XFRM_STATE_DEAD)
|
|
goto unlock;
|
|
|
|
err = 0;
|
|
if (x->id.spi)
|
|
goto unlock;
|
|
|
|
err = -ENOENT;
|
|
|
|
if (minspi == maxspi) {
|
|
x0 = xfrm_state_lookup(net, mark, &x->id.daddr, minspi, x->id.proto, x->props.family);
|
|
if (x0) {
|
|
xfrm_state_put(x0);
|
|
goto unlock;
|
|
}
|
|
newspi = minspi;
|
|
} else {
|
|
u32 spi = 0;
|
|
for (h = 0; h < high-low+1; h++) {
|
|
spi = low + prandom_u32()%(high-low+1);
|
|
x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
|
|
if (x0 == NULL) {
|
|
newspi = htonl(spi);
|
|
break;
|
|
}
|
|
xfrm_state_put(x0);
|
|
}
|
|
}
|
|
if (newspi) {
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
x->id.spi = newspi;
|
|
h = xfrm_spi_hash(net, &x->id.daddr, x->id.spi, x->id.proto, x->props.family);
|
|
hlist_add_head_rcu(&x->byspi, net->xfrm.state_byspi + h);
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
|
|
err = 0;
|
|
}
|
|
|
|
unlock:
|
|
spin_unlock_bh(&x->lock);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_alloc_spi);
|
|
|
|
static bool __xfrm_state_filter_match(struct xfrm_state *x,
|
|
struct xfrm_address_filter *filter)
|
|
{
|
|
if (filter) {
|
|
if ((filter->family == AF_INET ||
|
|
filter->family == AF_INET6) &&
|
|
x->props.family != filter->family)
|
|
return false;
|
|
|
|
return addr_match(&x->props.saddr, &filter->saddr,
|
|
filter->splen) &&
|
|
addr_match(&x->id.daddr, &filter->daddr,
|
|
filter->dplen);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
|
|
int (*func)(struct xfrm_state *, int, void*),
|
|
void *data)
|
|
{
|
|
struct xfrm_state *state;
|
|
struct xfrm_state_walk *x;
|
|
int err = 0;
|
|
|
|
if (walk->seq != 0 && list_empty(&walk->all))
|
|
return 0;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
if (list_empty(&walk->all))
|
|
x = list_first_entry(&net->xfrm.state_all, struct xfrm_state_walk, all);
|
|
else
|
|
x = list_first_entry(&walk->all, struct xfrm_state_walk, all);
|
|
list_for_each_entry_from(x, &net->xfrm.state_all, all) {
|
|
if (x->state == XFRM_STATE_DEAD)
|
|
continue;
|
|
state = container_of(x, struct xfrm_state, km);
|
|
if (!xfrm_id_proto_match(state->id.proto, walk->proto))
|
|
continue;
|
|
if (!__xfrm_state_filter_match(state, walk->filter))
|
|
continue;
|
|
err = func(state, walk->seq, data);
|
|
if (err) {
|
|
list_move_tail(&walk->all, &x->all);
|
|
goto out;
|
|
}
|
|
walk->seq++;
|
|
}
|
|
if (walk->seq == 0) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
list_del_init(&walk->all);
|
|
out:
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_walk);
|
|
|
|
void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto,
|
|
struct xfrm_address_filter *filter)
|
|
{
|
|
INIT_LIST_HEAD(&walk->all);
|
|
walk->proto = proto;
|
|
walk->state = XFRM_STATE_DEAD;
|
|
walk->seq = 0;
|
|
walk->filter = filter;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_walk_init);
|
|
|
|
void xfrm_state_walk_done(struct xfrm_state_walk *walk, struct net *net)
|
|
{
|
|
kfree(walk->filter);
|
|
|
|
if (list_empty(&walk->all))
|
|
return;
|
|
|
|
spin_lock_bh(&net->xfrm.xfrm_state_lock);
|
|
list_del(&walk->all);
|
|
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_walk_done);
|
|
|
|
static void xfrm_replay_timer_handler(struct timer_list *t)
|
|
{
|
|
struct xfrm_state *x = from_timer(x, t, rtimer);
|
|
|
|
spin_lock(&x->lock);
|
|
|
|
if (x->km.state == XFRM_STATE_VALID) {
|
|
if (xfrm_aevent_is_on(xs_net(x)))
|
|
xfrm_replay_notify(x, XFRM_REPLAY_TIMEOUT);
|
|
else
|
|
x->xflags |= XFRM_TIME_DEFER;
|
|
}
|
|
|
|
spin_unlock(&x->lock);
|
|
}
|
|
|
|
static LIST_HEAD(xfrm_km_list);
|
|
|
|
void km_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
|
|
{
|
|
struct xfrm_mgr *km;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(km, &xfrm_km_list, list)
|
|
if (km->notify_policy)
|
|
km->notify_policy(xp, dir, c);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
void km_state_notify(struct xfrm_state *x, const struct km_event *c)
|
|
{
|
|
struct xfrm_mgr *km;
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(km, &xfrm_km_list, list)
|
|
if (km->notify)
|
|
km->notify(x, c);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
EXPORT_SYMBOL(km_policy_notify);
|
|
EXPORT_SYMBOL(km_state_notify);
|
|
|
|
void km_state_expired(struct xfrm_state *x, int hard, u32 portid)
|
|
{
|
|
struct km_event c;
|
|
|
|
c.data.hard = hard;
|
|
c.portid = portid;
|
|
c.event = XFRM_MSG_EXPIRE;
|
|
km_state_notify(x, &c);
|
|
}
|
|
|
|
EXPORT_SYMBOL(km_state_expired);
|
|
/*
|
|
* We send to all registered managers regardless of failure
|
|
* We are happy with one success
|
|
*/
|
|
int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol)
|
|
{
|
|
int err = -EINVAL, acqret;
|
|
struct xfrm_mgr *km;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(km, &xfrm_km_list, list) {
|
|
acqret = km->acquire(x, t, pol);
|
|
if (!acqret)
|
|
err = acqret;
|
|
}
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(km_query);
|
|
|
|
static int __km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
|
|
{
|
|
int err = -EINVAL;
|
|
struct xfrm_mgr *km;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(km, &xfrm_km_list, list) {
|
|
if (km->new_mapping)
|
|
err = km->new_mapping(x, ipaddr, sport);
|
|
if (!err)
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
|
|
int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (x->mapping_maxage) {
|
|
if ((jiffies / HZ - x->new_mapping) > x->mapping_maxage ||
|
|
x->new_mapping_sport != sport) {
|
|
x->new_mapping_sport = sport;
|
|
x->new_mapping = jiffies / HZ;
|
|
ret = __km_new_mapping(x, ipaddr, sport);
|
|
}
|
|
} else {
|
|
ret = __km_new_mapping(x, ipaddr, sport);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(km_new_mapping);
|
|
|
|
void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 portid)
|
|
{
|
|
struct km_event c;
|
|
|
|
c.data.hard = hard;
|
|
c.portid = portid;
|
|
c.event = XFRM_MSG_POLEXPIRE;
|
|
km_policy_notify(pol, dir, &c);
|
|
}
|
|
EXPORT_SYMBOL(km_policy_expired);
|
|
|
|
#ifdef CONFIG_XFRM_MIGRATE
|
|
int km_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
|
|
const struct xfrm_migrate *m, int num_migrate,
|
|
const struct xfrm_kmaddress *k,
|
|
const struct xfrm_encap_tmpl *encap)
|
|
{
|
|
int err = -EINVAL;
|
|
int ret;
|
|
struct xfrm_mgr *km;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(km, &xfrm_km_list, list) {
|
|
if (km->migrate) {
|
|
ret = km->migrate(sel, dir, type, m, num_migrate, k,
|
|
encap);
|
|
if (!ret)
|
|
err = ret;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(km_migrate);
|
|
#endif
|
|
|
|
int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr)
|
|
{
|
|
int err = -EINVAL;
|
|
int ret;
|
|
struct xfrm_mgr *km;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(km, &xfrm_km_list, list) {
|
|
if (km->report) {
|
|
ret = km->report(net, proto, sel, addr);
|
|
if (!ret)
|
|
err = ret;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(km_report);
|
|
|
|
static bool km_is_alive(const struct km_event *c)
|
|
{
|
|
struct xfrm_mgr *km;
|
|
bool is_alive = false;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(km, &xfrm_km_list, list) {
|
|
if (km->is_alive && km->is_alive(c)) {
|
|
is_alive = true;
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return is_alive;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_XFRM_USER_COMPAT)
|
|
static DEFINE_SPINLOCK(xfrm_translator_lock);
|
|
static struct xfrm_translator __rcu *xfrm_translator;
|
|
|
|
struct xfrm_translator *xfrm_get_translator(void)
|
|
{
|
|
struct xfrm_translator *xtr;
|
|
|
|
rcu_read_lock();
|
|
xtr = rcu_dereference(xfrm_translator);
|
|
if (unlikely(!xtr))
|
|
goto out;
|
|
if (!try_module_get(xtr->owner))
|
|
xtr = NULL;
|
|
out:
|
|
rcu_read_unlock();
|
|
return xtr;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_get_translator);
|
|
|
|
void xfrm_put_translator(struct xfrm_translator *xtr)
|
|
{
|
|
module_put(xtr->owner);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_put_translator);
|
|
|
|
int xfrm_register_translator(struct xfrm_translator *xtr)
|
|
{
|
|
int err = 0;
|
|
|
|
spin_lock_bh(&xfrm_translator_lock);
|
|
if (unlikely(xfrm_translator != NULL))
|
|
err = -EEXIST;
|
|
else
|
|
rcu_assign_pointer(xfrm_translator, xtr);
|
|
spin_unlock_bh(&xfrm_translator_lock);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_register_translator);
|
|
|
|
int xfrm_unregister_translator(struct xfrm_translator *xtr)
|
|
{
|
|
int err = 0;
|
|
|
|
spin_lock_bh(&xfrm_translator_lock);
|
|
if (likely(xfrm_translator != NULL)) {
|
|
if (rcu_access_pointer(xfrm_translator) != xtr)
|
|
err = -EINVAL;
|
|
else
|
|
RCU_INIT_POINTER(xfrm_translator, NULL);
|
|
}
|
|
spin_unlock_bh(&xfrm_translator_lock);
|
|
synchronize_rcu();
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_unregister_translator);
|
|
#endif
|
|
|
|
int xfrm_user_policy(struct sock *sk, int optname, sockptr_t optval, int optlen)
|
|
{
|
|
int err;
|
|
u8 *data;
|
|
struct xfrm_mgr *km;
|
|
struct xfrm_policy *pol = NULL;
|
|
|
|
if (sockptr_is_null(optval) && !optlen) {
|
|
xfrm_sk_policy_insert(sk, XFRM_POLICY_IN, NULL);
|
|
xfrm_sk_policy_insert(sk, XFRM_POLICY_OUT, NULL);
|
|
__sk_dst_reset(sk);
|
|
return 0;
|
|
}
|
|
|
|
if (optlen <= 0 || optlen > PAGE_SIZE)
|
|
return -EMSGSIZE;
|
|
|
|
data = memdup_sockptr(optval, optlen);
|
|
if (IS_ERR(data))
|
|
return PTR_ERR(data);
|
|
|
|
if (in_compat_syscall()) {
|
|
struct xfrm_translator *xtr = xfrm_get_translator();
|
|
|
|
if (!xtr) {
|
|
kfree(data);
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
err = xtr->xlate_user_policy_sockptr(&data, optlen);
|
|
xfrm_put_translator(xtr);
|
|
if (err) {
|
|
kfree(data);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
err = -EINVAL;
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(km, &xfrm_km_list, list) {
|
|
pol = km->compile_policy(sk, optname, data,
|
|
optlen, &err);
|
|
if (err >= 0)
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (err >= 0) {
|
|
xfrm_sk_policy_insert(sk, err, pol);
|
|
xfrm_pol_put(pol);
|
|
__sk_dst_reset(sk);
|
|
err = 0;
|
|
}
|
|
|
|
kfree(data);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_user_policy);
|
|
|
|
static DEFINE_SPINLOCK(xfrm_km_lock);
|
|
|
|
int xfrm_register_km(struct xfrm_mgr *km)
|
|
{
|
|
spin_lock_bh(&xfrm_km_lock);
|
|
list_add_tail_rcu(&km->list, &xfrm_km_list);
|
|
spin_unlock_bh(&xfrm_km_lock);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_register_km);
|
|
|
|
int xfrm_unregister_km(struct xfrm_mgr *km)
|
|
{
|
|
spin_lock_bh(&xfrm_km_lock);
|
|
list_del_rcu(&km->list);
|
|
spin_unlock_bh(&xfrm_km_lock);
|
|
synchronize_rcu();
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_unregister_km);
|
|
|
|
int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
|
|
{
|
|
int err = 0;
|
|
|
|
if (WARN_ON(afinfo->family >= NPROTO))
|
|
return -EAFNOSUPPORT;
|
|
|
|
spin_lock_bh(&xfrm_state_afinfo_lock);
|
|
if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
|
|
err = -EEXIST;
|
|
else
|
|
rcu_assign_pointer(xfrm_state_afinfo[afinfo->family], afinfo);
|
|
spin_unlock_bh(&xfrm_state_afinfo_lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_register_afinfo);
|
|
|
|
int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
|
|
{
|
|
int err = 0, family = afinfo->family;
|
|
|
|
if (WARN_ON(family >= NPROTO))
|
|
return -EAFNOSUPPORT;
|
|
|
|
spin_lock_bh(&xfrm_state_afinfo_lock);
|
|
if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
|
|
if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
|
|
err = -EINVAL;
|
|
else
|
|
RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
|
|
}
|
|
spin_unlock_bh(&xfrm_state_afinfo_lock);
|
|
synchronize_rcu();
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
|
|
|
|
struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
|
|
{
|
|
if (unlikely(family >= NPROTO))
|
|
return NULL;
|
|
|
|
return rcu_dereference(xfrm_state_afinfo[family]);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_state_afinfo_get_rcu);
|
|
|
|
struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
|
|
{
|
|
struct xfrm_state_afinfo *afinfo;
|
|
if (unlikely(family >= NPROTO))
|
|
return NULL;
|
|
rcu_read_lock();
|
|
afinfo = rcu_dereference(xfrm_state_afinfo[family]);
|
|
if (unlikely(!afinfo))
|
|
rcu_read_unlock();
|
|
return afinfo;
|
|
}
|
|
|
|
void xfrm_flush_gc(void)
|
|
{
|
|
flush_work(&xfrm_state_gc_work);
|
|
}
|
|
EXPORT_SYMBOL(xfrm_flush_gc);
|
|
|
|
/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
|
|
void xfrm_state_delete_tunnel(struct xfrm_state *x)
|
|
{
|
|
if (x->tunnel) {
|
|
struct xfrm_state *t = x->tunnel;
|
|
|
|
if (atomic_read(&t->tunnel_users) == 2)
|
|
xfrm_state_delete(t);
|
|
atomic_dec(&t->tunnel_users);
|
|
xfrm_state_put_sync(t);
|
|
x->tunnel = NULL;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(xfrm_state_delete_tunnel);
|
|
|
|
u32 xfrm_state_mtu(struct xfrm_state *x, int mtu)
|
|
{
|
|
const struct xfrm_type *type = READ_ONCE(x->type);
|
|
struct crypto_aead *aead;
|
|
u32 blksize, net_adj = 0;
|
|
|
|
if (x->km.state != XFRM_STATE_VALID ||
|
|
!type || type->proto != IPPROTO_ESP)
|
|
return mtu - x->props.header_len;
|
|
|
|
aead = x->data;
|
|
blksize = ALIGN(crypto_aead_blocksize(aead), 4);
|
|
|
|
switch (x->props.mode) {
|
|
case XFRM_MODE_TRANSPORT:
|
|
case XFRM_MODE_BEET:
|
|
if (x->props.family == AF_INET)
|
|
net_adj = sizeof(struct iphdr);
|
|
else if (x->props.family == AF_INET6)
|
|
net_adj = sizeof(struct ipv6hdr);
|
|
break;
|
|
case XFRM_MODE_TUNNEL:
|
|
break;
|
|
default:
|
|
WARN_ON_ONCE(1);
|
|
break;
|
|
}
|
|
|
|
return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
|
|
net_adj) & ~(blksize - 1)) + net_adj - 2;
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_state_mtu);
|
|
|
|
int __xfrm_init_state(struct xfrm_state *x, bool init_replay, bool offload)
|
|
{
|
|
const struct xfrm_mode *inner_mode;
|
|
const struct xfrm_mode *outer_mode;
|
|
int family = x->props.family;
|
|
int err;
|
|
|
|
if (family == AF_INET &&
|
|
xs_net(x)->ipv4.sysctl_ip_no_pmtu_disc)
|
|
x->props.flags |= XFRM_STATE_NOPMTUDISC;
|
|
|
|
err = -EPROTONOSUPPORT;
|
|
|
|
if (x->sel.family != AF_UNSPEC) {
|
|
inner_mode = xfrm_get_mode(x->props.mode, x->sel.family);
|
|
if (inner_mode == NULL)
|
|
goto error;
|
|
|
|
if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL) &&
|
|
family != x->sel.family)
|
|
goto error;
|
|
|
|
x->inner_mode = *inner_mode;
|
|
} else {
|
|
const struct xfrm_mode *inner_mode_iaf;
|
|
int iafamily = AF_INET;
|
|
|
|
inner_mode = xfrm_get_mode(x->props.mode, x->props.family);
|
|
if (inner_mode == NULL)
|
|
goto error;
|
|
|
|
if (!(inner_mode->flags & XFRM_MODE_FLAG_TUNNEL))
|
|
goto error;
|
|
|
|
x->inner_mode = *inner_mode;
|
|
|
|
if (x->props.family == AF_INET)
|
|
iafamily = AF_INET6;
|
|
|
|
inner_mode_iaf = xfrm_get_mode(x->props.mode, iafamily);
|
|
if (inner_mode_iaf) {
|
|
if (inner_mode_iaf->flags & XFRM_MODE_FLAG_TUNNEL)
|
|
x->inner_mode_iaf = *inner_mode_iaf;
|
|
}
|
|
}
|
|
|
|
x->type = xfrm_get_type(x->id.proto, family);
|
|
if (x->type == NULL)
|
|
goto error;
|
|
|
|
x->type_offload = xfrm_get_type_offload(x->id.proto, family, offload);
|
|
|
|
err = x->type->init_state(x);
|
|
if (err)
|
|
goto error;
|
|
|
|
outer_mode = xfrm_get_mode(x->props.mode, family);
|
|
if (!outer_mode) {
|
|
err = -EPROTONOSUPPORT;
|
|
goto error;
|
|
}
|
|
|
|
x->outer_mode = *outer_mode;
|
|
if (init_replay) {
|
|
err = xfrm_init_replay(x);
|
|
if (err)
|
|
goto error;
|
|
}
|
|
|
|
error:
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL(__xfrm_init_state);
|
|
|
|
int xfrm_init_state(struct xfrm_state *x)
|
|
{
|
|
int err;
|
|
|
|
err = __xfrm_init_state(x, true, false);
|
|
if (!err)
|
|
x->km.state = XFRM_STATE_VALID;
|
|
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL(xfrm_init_state);
|
|
|
|
int __net_init xfrm_state_init(struct net *net)
|
|
{
|
|
unsigned int sz;
|
|
|
|
if (net_eq(net, &init_net))
|
|
xfrm_state_cache = KMEM_CACHE(xfrm_state,
|
|
SLAB_HWCACHE_ALIGN | SLAB_PANIC);
|
|
|
|
INIT_LIST_HEAD(&net->xfrm.state_all);
|
|
|
|
sz = sizeof(struct hlist_head) * 8;
|
|
|
|
net->xfrm.state_bydst = xfrm_hash_alloc(sz);
|
|
if (!net->xfrm.state_bydst)
|
|
goto out_bydst;
|
|
net->xfrm.state_bysrc = xfrm_hash_alloc(sz);
|
|
if (!net->xfrm.state_bysrc)
|
|
goto out_bysrc;
|
|
net->xfrm.state_byspi = xfrm_hash_alloc(sz);
|
|
if (!net->xfrm.state_byspi)
|
|
goto out_byspi;
|
|
net->xfrm.state_byseq = xfrm_hash_alloc(sz);
|
|
if (!net->xfrm.state_byseq)
|
|
goto out_byseq;
|
|
net->xfrm.state_hmask = ((sz / sizeof(struct hlist_head)) - 1);
|
|
|
|
net->xfrm.state_num = 0;
|
|
INIT_WORK(&net->xfrm.state_hash_work, xfrm_hash_resize);
|
|
spin_lock_init(&net->xfrm.xfrm_state_lock);
|
|
seqcount_spinlock_init(&net->xfrm.xfrm_state_hash_generation,
|
|
&net->xfrm.xfrm_state_lock);
|
|
return 0;
|
|
|
|
out_byseq:
|
|
xfrm_hash_free(net->xfrm.state_byspi, sz);
|
|
out_byspi:
|
|
xfrm_hash_free(net->xfrm.state_bysrc, sz);
|
|
out_bysrc:
|
|
xfrm_hash_free(net->xfrm.state_bydst, sz);
|
|
out_bydst:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
void xfrm_state_fini(struct net *net)
|
|
{
|
|
unsigned int sz;
|
|
|
|
flush_work(&net->xfrm.state_hash_work);
|
|
flush_work(&xfrm_state_gc_work);
|
|
xfrm_state_flush(net, 0, false, true);
|
|
|
|
WARN_ON(!list_empty(&net->xfrm.state_all));
|
|
|
|
sz = (net->xfrm.state_hmask + 1) * sizeof(struct hlist_head);
|
|
WARN_ON(!hlist_empty(net->xfrm.state_byseq));
|
|
xfrm_hash_free(net->xfrm.state_byseq, sz);
|
|
WARN_ON(!hlist_empty(net->xfrm.state_byspi));
|
|
xfrm_hash_free(net->xfrm.state_byspi, sz);
|
|
WARN_ON(!hlist_empty(net->xfrm.state_bysrc));
|
|
xfrm_hash_free(net->xfrm.state_bysrc, sz);
|
|
WARN_ON(!hlist_empty(net->xfrm.state_bydst));
|
|
xfrm_hash_free(net->xfrm.state_bydst, sz);
|
|
}
|
|
|
|
#ifdef CONFIG_AUDITSYSCALL
|
|
static void xfrm_audit_helper_sainfo(struct xfrm_state *x,
|
|
struct audit_buffer *audit_buf)
|
|
{
|
|
struct xfrm_sec_ctx *ctx = x->security;
|
|
u32 spi = ntohl(x->id.spi);
|
|
|
|
if (ctx)
|
|
audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
|
|
ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
|
|
|
|
switch (x->props.family) {
|
|
case AF_INET:
|
|
audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
|
|
&x->props.saddr.a4, &x->id.daddr.a4);
|
|
break;
|
|
case AF_INET6:
|
|
audit_log_format(audit_buf, " src=%pI6 dst=%pI6",
|
|
x->props.saddr.a6, x->id.daddr.a6);
|
|
break;
|
|
}
|
|
|
|
audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
|
|
}
|
|
|
|
static void xfrm_audit_helper_pktinfo(struct sk_buff *skb, u16 family,
|
|
struct audit_buffer *audit_buf)
|
|
{
|
|
const struct iphdr *iph4;
|
|
const struct ipv6hdr *iph6;
|
|
|
|
switch (family) {
|
|
case AF_INET:
|
|
iph4 = ip_hdr(skb);
|
|
audit_log_format(audit_buf, " src=%pI4 dst=%pI4",
|
|
&iph4->saddr, &iph4->daddr);
|
|
break;
|
|
case AF_INET6:
|
|
iph6 = ipv6_hdr(skb);
|
|
audit_log_format(audit_buf,
|
|
" src=%pI6 dst=%pI6 flowlbl=0x%x%02x%02x",
|
|
&iph6->saddr, &iph6->daddr,
|
|
iph6->flow_lbl[0] & 0x0f,
|
|
iph6->flow_lbl[1],
|
|
iph6->flow_lbl[2]);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void xfrm_audit_state_add(struct xfrm_state *x, int result, bool task_valid)
|
|
{
|
|
struct audit_buffer *audit_buf;
|
|
|
|
audit_buf = xfrm_audit_start("SAD-add");
|
|
if (audit_buf == NULL)
|
|
return;
|
|
xfrm_audit_helper_usrinfo(task_valid, audit_buf);
|
|
xfrm_audit_helper_sainfo(x, audit_buf);
|
|
audit_log_format(audit_buf, " res=%u", result);
|
|
audit_log_end(audit_buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_audit_state_add);
|
|
|
|
void xfrm_audit_state_delete(struct xfrm_state *x, int result, bool task_valid)
|
|
{
|
|
struct audit_buffer *audit_buf;
|
|
|
|
audit_buf = xfrm_audit_start("SAD-delete");
|
|
if (audit_buf == NULL)
|
|
return;
|
|
xfrm_audit_helper_usrinfo(task_valid, audit_buf);
|
|
xfrm_audit_helper_sainfo(x, audit_buf);
|
|
audit_log_format(audit_buf, " res=%u", result);
|
|
audit_log_end(audit_buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);
|
|
|
|
void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct audit_buffer *audit_buf;
|
|
u32 spi;
|
|
|
|
audit_buf = xfrm_audit_start("SA-replay-overflow");
|
|
if (audit_buf == NULL)
|
|
return;
|
|
xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
|
|
/* don't record the sequence number because it's inherent in this kind
|
|
* of audit message */
|
|
spi = ntohl(x->id.spi);
|
|
audit_log_format(audit_buf, " spi=%u(0x%x)", spi, spi);
|
|
audit_log_end(audit_buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_audit_state_replay_overflow);
|
|
|
|
void xfrm_audit_state_replay(struct xfrm_state *x,
|
|
struct sk_buff *skb, __be32 net_seq)
|
|
{
|
|
struct audit_buffer *audit_buf;
|
|
u32 spi;
|
|
|
|
audit_buf = xfrm_audit_start("SA-replayed-pkt");
|
|
if (audit_buf == NULL)
|
|
return;
|
|
xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
|
|
spi = ntohl(x->id.spi);
|
|
audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
|
|
spi, spi, ntohl(net_seq));
|
|
audit_log_end(audit_buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_audit_state_replay);
|
|
|
|
void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family)
|
|
{
|
|
struct audit_buffer *audit_buf;
|
|
|
|
audit_buf = xfrm_audit_start("SA-notfound");
|
|
if (audit_buf == NULL)
|
|
return;
|
|
xfrm_audit_helper_pktinfo(skb, family, audit_buf);
|
|
audit_log_end(audit_buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound_simple);
|
|
|
|
void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
|
|
__be32 net_spi, __be32 net_seq)
|
|
{
|
|
struct audit_buffer *audit_buf;
|
|
u32 spi;
|
|
|
|
audit_buf = xfrm_audit_start("SA-notfound");
|
|
if (audit_buf == NULL)
|
|
return;
|
|
xfrm_audit_helper_pktinfo(skb, family, audit_buf);
|
|
spi = ntohl(net_spi);
|
|
audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
|
|
spi, spi, ntohl(net_seq));
|
|
audit_log_end(audit_buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_audit_state_notfound);
|
|
|
|
void xfrm_audit_state_icvfail(struct xfrm_state *x,
|
|
struct sk_buff *skb, u8 proto)
|
|
{
|
|
struct audit_buffer *audit_buf;
|
|
__be32 net_spi;
|
|
__be32 net_seq;
|
|
|
|
audit_buf = xfrm_audit_start("SA-icv-failure");
|
|
if (audit_buf == NULL)
|
|
return;
|
|
xfrm_audit_helper_pktinfo(skb, x->props.family, audit_buf);
|
|
if (xfrm_parse_spi(skb, proto, &net_spi, &net_seq) == 0) {
|
|
u32 spi = ntohl(net_spi);
|
|
audit_log_format(audit_buf, " spi=%u(0x%x) seqno=%u",
|
|
spi, spi, ntohl(net_seq));
|
|
}
|
|
audit_log_end(audit_buf);
|
|
}
|
|
EXPORT_SYMBOL_GPL(xfrm_audit_state_icvfail);
|
|
#endif /* CONFIG_AUDITSYSCALL */
|