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2da4c187ae
Steffen Klassert says: ==================== 1) Fix packet receiving of standard IP tunnels when the xfrm_interface module is installed. From Xin Long. 2) Fix a race condition between spi allocating and hash list resizing. From zhuoliang zhang. ==================== Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2855 lines
66 KiB
C
2855 lines
66 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/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 __read_mostly seqcount_t xfrm_state_hash_generation = SEQCNT_ZERO(xfrm_state_hash_generation);
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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 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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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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}
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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, *odst, *osrc, *ospi;
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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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spin_lock_bh(&net->xfrm.xfrm_state_lock);
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write_seqcount_begin(&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, 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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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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net->xfrm.state_hmask = nhashmask;
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write_seqcount_end(&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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}
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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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}
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return type;
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}
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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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}
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static const struct xfrm_mode xfrm4_mode_map[XFRM_MODE_MAX] = {
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[XFRM_MODE_BEET] = {
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.encap = XFRM_MODE_BEET,
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.flags = XFRM_MODE_FLAG_TUNNEL,
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.family = AF_INET,
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},
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[XFRM_MODE_TRANSPORT] = {
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.encap = XFRM_MODE_TRANSPORT,
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.family = AF_INET,
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},
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[XFRM_MODE_TUNNEL] = {
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.encap = XFRM_MODE_TUNNEL,
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.flags = XFRM_MODE_FLAG_TUNNEL,
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.family = AF_INET,
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},
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};
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static const struct xfrm_mode xfrm6_mode_map[XFRM_MODE_MAX] = {
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[XFRM_MODE_BEET] = {
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.encap = XFRM_MODE_BEET,
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.flags = XFRM_MODE_FLAG_TUNNEL,
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.family = AF_INET6,
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},
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[XFRM_MODE_ROUTEOPTIMIZATION] = {
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.encap = XFRM_MODE_ROUTEOPTIMIZATION,
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.family = AF_INET6,
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},
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[XFRM_MODE_TRANSPORT] = {
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.encap = XFRM_MODE_TRANSPORT,
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.family = AF_INET6,
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},
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[XFRM_MODE_TUNNEL] = {
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.encap = XFRM_MODE_TUNNEL,
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.flags = XFRM_MODE_FLAG_TUNNEL,
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.family = AF_INET6,
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},
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};
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static const struct xfrm_mode *xfrm_get_mode(unsigned int encap, int family)
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{
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const struct xfrm_mode *mode;
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if (unlikely(encap >= XFRM_MODE_MAX))
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return NULL;
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switch (family) {
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case AF_INET:
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mode = &xfrm4_mode_map[encap];
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if (mode->family == family)
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return mode;
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break;
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case AF_INET6:
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mode = &xfrm6_mode_map[encap];
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if (mode->family == family)
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return mode;
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break;
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default:
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break;
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}
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return NULL;
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}
|
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|
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void xfrm_state_free(struct xfrm_state *x)
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{
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kmem_cache_free(xfrm_state_cache, x);
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}
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EXPORT_SYMBOL(xfrm_state_free);
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static void ___xfrm_state_destroy(struct xfrm_state *x)
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{
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hrtimer_cancel(&x->mtimer);
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del_timer_sync(&x->rtimer);
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kfree(x->aead);
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kfree(x->aalg);
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kfree(x->ealg);
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kfree(x->calg);
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kfree(x->encap);
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kfree(x->coaddr);
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kfree(x->replay_esn);
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kfree(x->preplay_esn);
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if (x->type_offload)
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xfrm_put_type_offload(x->type_offload);
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if (x->type) {
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x->type->destructor(x);
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xfrm_put_type(x->type);
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}
|
|
if (x->xfrag.page)
|
|
put_page(x->xfrag.page);
|
|
xfrm_dev_state_free(x);
|
|
security_xfrm_state_free(x);
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|
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);
|
|
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->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))
|
|
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))
|
|
*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(&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);
|
|
}
|
|
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(&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);
|
|
}
|
|
|
|
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));
|
|
|
|
if (xfrm_init_state(x) < 0)
|
|
goto error;
|
|
|
|
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;
|
|
|
|
return x;
|
|
|
|
error:
|
|
xfrm_state_put(x);
|
|
out:
|
|
return NULL;
|
|
}
|
|
|
|
struct xfrm_state *xfrm_migrate_state_find(struct xfrm_migrate *m, struct net *net)
|
|
{
|
|
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 (!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 (!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;
|
|
|
|
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)
|
|
{
|
|
int i;
|
|
|
|
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 (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)))
|
|
x->repl->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);
|
|
|
|
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;
|
|
}
|
|
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)
|
|
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_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);
|
|
return 0;
|
|
|
|
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_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 */
|