551 lines
12 KiB
C
551 lines
12 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* xfrm_input.c
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*
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* Changes:
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* YOSHIFUJI Hideaki @USAGI
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* Split up af-specific portion
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*
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*/
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#include <linux/bottom_half.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/percpu.h>
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#include <net/dst.h>
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#include <net/ip.h>
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#include <net/xfrm.h>
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#include <net/ip_tunnels.h>
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#include <net/ip6_tunnel.h>
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struct xfrm_trans_tasklet {
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struct tasklet_struct tasklet;
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struct sk_buff_head queue;
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};
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struct xfrm_trans_cb {
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int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb);
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};
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#define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0]))
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static struct kmem_cache *secpath_cachep __read_mostly;
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static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
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static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[AF_INET6 + 1];
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static struct gro_cells gro_cells;
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static struct net_device xfrm_napi_dev;
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static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet);
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int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo)
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{
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int err = 0;
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if (WARN_ON(afinfo->family >= ARRAY_SIZE(xfrm_input_afinfo)))
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return -EAFNOSUPPORT;
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spin_lock_bh(&xfrm_input_afinfo_lock);
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if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL))
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err = -EEXIST;
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else
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rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo);
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spin_unlock_bh(&xfrm_input_afinfo_lock);
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return err;
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}
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EXPORT_SYMBOL(xfrm_input_register_afinfo);
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int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
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{
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int err = 0;
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spin_lock_bh(&xfrm_input_afinfo_lock);
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if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) {
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if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo))
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err = -EINVAL;
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else
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RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->family], NULL);
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}
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spin_unlock_bh(&xfrm_input_afinfo_lock);
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synchronize_rcu();
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return err;
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}
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EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
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static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
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{
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const struct xfrm_input_afinfo *afinfo;
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if (WARN_ON_ONCE(family >= ARRAY_SIZE(xfrm_input_afinfo)))
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return NULL;
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rcu_read_lock();
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afinfo = rcu_dereference(xfrm_input_afinfo[family]);
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if (unlikely(!afinfo))
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rcu_read_unlock();
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return afinfo;
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}
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static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
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int err)
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{
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int ret;
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const struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family);
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if (!afinfo)
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return -EAFNOSUPPORT;
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ret = afinfo->callback(skb, protocol, err);
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rcu_read_unlock();
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return ret;
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}
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void __secpath_destroy(struct sec_path *sp)
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{
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int i;
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for (i = 0; i < sp->len; i++)
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xfrm_state_put(sp->xvec[i]);
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kmem_cache_free(secpath_cachep, sp);
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}
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EXPORT_SYMBOL(__secpath_destroy);
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struct sec_path *secpath_dup(struct sec_path *src)
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{
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struct sec_path *sp;
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sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC);
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if (!sp)
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return NULL;
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sp->len = 0;
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sp->olen = 0;
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memset(sp->ovec, 0, sizeof(sp->ovec[XFRM_MAX_OFFLOAD_DEPTH]));
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if (src) {
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int i;
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memcpy(sp, src, sizeof(*sp));
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for (i = 0; i < sp->len; i++)
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xfrm_state_hold(sp->xvec[i]);
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}
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refcount_set(&sp->refcnt, 1);
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return sp;
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}
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EXPORT_SYMBOL(secpath_dup);
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int secpath_set(struct sk_buff *skb)
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{
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struct sec_path *sp;
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/* Allocate new secpath or COW existing one. */
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if (!skb->sp || refcount_read(&skb->sp->refcnt) != 1) {
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sp = secpath_dup(skb->sp);
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if (!sp)
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return -ENOMEM;
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if (skb->sp)
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secpath_put(skb->sp);
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skb->sp = sp;
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}
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return 0;
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}
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EXPORT_SYMBOL(secpath_set);
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/* Fetch spi and seq from ipsec header */
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int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
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{
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int offset, offset_seq;
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int hlen;
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switch (nexthdr) {
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case IPPROTO_AH:
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hlen = sizeof(struct ip_auth_hdr);
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offset = offsetof(struct ip_auth_hdr, spi);
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offset_seq = offsetof(struct ip_auth_hdr, seq_no);
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break;
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case IPPROTO_ESP:
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hlen = sizeof(struct ip_esp_hdr);
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offset = offsetof(struct ip_esp_hdr, spi);
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offset_seq = offsetof(struct ip_esp_hdr, seq_no);
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break;
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case IPPROTO_COMP:
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if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
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return -EINVAL;
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*spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2)));
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*seq = 0;
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return 0;
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default:
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return 1;
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}
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if (!pskb_may_pull(skb, hlen))
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return -EINVAL;
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*spi = *(__be32 *)(skb_transport_header(skb) + offset);
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*seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
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return 0;
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}
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EXPORT_SYMBOL(xfrm_parse_spi);
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int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct xfrm_mode *inner_mode = x->inner_mode;
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int err;
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err = x->outer_mode->afinfo->extract_input(x, skb);
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if (err)
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return err;
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if (x->sel.family == AF_UNSPEC) {
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inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
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if (inner_mode == NULL)
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return -EAFNOSUPPORT;
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}
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skb->protocol = inner_mode->afinfo->eth_proto;
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return inner_mode->input2(x, skb);
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}
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EXPORT_SYMBOL(xfrm_prepare_input);
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int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
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{
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struct net *net = dev_net(skb->dev);
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int err;
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__be32 seq;
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__be32 seq_hi;
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struct xfrm_state *x = NULL;
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xfrm_address_t *daddr;
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struct xfrm_mode *inner_mode;
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u32 mark = skb->mark;
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unsigned int family = AF_UNSPEC;
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int decaps = 0;
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int async = 0;
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bool xfrm_gro = false;
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bool crypto_done = false;
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struct xfrm_offload *xo = xfrm_offload(skb);
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if (encap_type < 0) {
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x = xfrm_input_state(skb);
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if (unlikely(x->km.state != XFRM_STATE_VALID)) {
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if (x->km.state == XFRM_STATE_ACQ)
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XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
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else
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XFRM_INC_STATS(net,
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LINUX_MIB_XFRMINSTATEINVALID);
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goto drop;
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}
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family = x->outer_mode->afinfo->family;
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/* An encap_type of -1 indicates async resumption. */
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if (encap_type == -1) {
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async = 1;
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seq = XFRM_SKB_CB(skb)->seq.input.low;
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goto resume;
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}
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/* encap_type < -1 indicates a GRO call. */
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encap_type = 0;
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seq = XFRM_SPI_SKB_CB(skb)->seq;
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if (xo && (xo->flags & CRYPTO_DONE)) {
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crypto_done = true;
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x = xfrm_input_state(skb);
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family = XFRM_SPI_SKB_CB(skb)->family;
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if (!(xo->status & CRYPTO_SUCCESS)) {
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if (xo->status &
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(CRYPTO_TRANSPORT_AH_AUTH_FAILED |
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CRYPTO_TRANSPORT_ESP_AUTH_FAILED |
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CRYPTO_TUNNEL_AH_AUTH_FAILED |
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CRYPTO_TUNNEL_ESP_AUTH_FAILED)) {
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xfrm_audit_state_icvfail(x, skb,
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x->type->proto);
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x->stats.integrity_failed++;
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
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goto drop;
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}
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if (xo->status & CRYPTO_INVALID_PROTOCOL) {
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
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goto drop;
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}
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
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goto drop;
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}
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if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
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goto drop;
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}
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}
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goto lock;
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}
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family = XFRM_SPI_SKB_CB(skb)->family;
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/* if tunnel is present override skb->mark value with tunnel i_key */
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switch (family) {
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case AF_INET:
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if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
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mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
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break;
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case AF_INET6:
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if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
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mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
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break;
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}
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err = secpath_set(skb);
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if (err) {
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
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goto drop;
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}
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seq = 0;
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if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
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goto drop;
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}
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daddr = (xfrm_address_t *)(skb_network_header(skb) +
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XFRM_SPI_SKB_CB(skb)->daddroff);
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do {
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if (skb->sp->len == XFRM_MAX_DEPTH) {
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
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goto drop;
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}
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x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
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if (x == NULL) {
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
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xfrm_audit_state_notfound(skb, family, spi, seq);
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goto drop;
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}
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skb->sp->xvec[skb->sp->len++] = x;
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lock:
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spin_lock(&x->lock);
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if (unlikely(x->km.state != XFRM_STATE_VALID)) {
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if (x->km.state == XFRM_STATE_ACQ)
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XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
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else
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XFRM_INC_STATS(net,
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LINUX_MIB_XFRMINSTATEINVALID);
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goto drop_unlock;
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}
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if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
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goto drop_unlock;
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}
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if (x->repl->check(x, skb, seq)) {
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
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goto drop_unlock;
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}
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if (xfrm_state_check_expire(x)) {
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XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
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goto drop_unlock;
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}
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||
|
|
spin_unlock(&x->lock);
|
||
|
|
|
||
|
|
if (xfrm_tunnel_check(skb, x, family)) {
|
||
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
|
||
|
|
goto drop;
|
||
|
|
}
|
||
|
|
|
||
|
|
seq_hi = htonl(xfrm_replay_seqhi(x, seq));
|
||
|
|
|
||
|
|
XFRM_SKB_CB(skb)->seq.input.low = seq;
|
||
|
|
XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
|
||
|
|
|
||
|
|
skb_dst_force(skb);
|
||
|
|
dev_hold(skb->dev);
|
||
|
|
|
||
|
|
if (crypto_done)
|
||
|
|
nexthdr = x->type_offload->input_tail(x, skb);
|
||
|
|
else
|
||
|
|
nexthdr = x->type->input(x, skb);
|
||
|
|
|
||
|
|
if (nexthdr == -EINPROGRESS)
|
||
|
|
return 0;
|
||
|
|
resume:
|
||
|
|
dev_put(skb->dev);
|
||
|
|
|
||
|
|
spin_lock(&x->lock);
|
||
|
|
if (nexthdr <= 0) {
|
||
|
|
if (nexthdr == -EBADMSG) {
|
||
|
|
xfrm_audit_state_icvfail(x, skb,
|
||
|
|
x->type->proto);
|
||
|
|
x->stats.integrity_failed++;
|
||
|
|
}
|
||
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
|
||
|
|
goto drop_unlock;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* only the first xfrm gets the encap type */
|
||
|
|
encap_type = 0;
|
||
|
|
|
||
|
|
if (async && x->repl->recheck(x, skb, seq)) {
|
||
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
|
||
|
|
goto drop_unlock;
|
||
|
|
}
|
||
|
|
|
||
|
|
x->repl->advance(x, seq);
|
||
|
|
|
||
|
|
x->curlft.bytes += skb->len;
|
||
|
|
x->curlft.packets++;
|
||
|
|
|
||
|
|
spin_unlock(&x->lock);
|
||
|
|
|
||
|
|
XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
|
||
|
|
|
||
|
|
inner_mode = x->inner_mode;
|
||
|
|
|
||
|
|
if (x->sel.family == AF_UNSPEC) {
|
||
|
|
inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
|
||
|
|
if (inner_mode == NULL) {
|
||
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
|
||
|
|
goto drop;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (inner_mode->input(x, skb)) {
|
||
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
|
||
|
|
goto drop;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
|
||
|
|
decaps = 1;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We need the inner address. However, we only get here for
|
||
|
|
* transport mode so the outer address is identical.
|
||
|
|
*/
|
||
|
|
daddr = &x->id.daddr;
|
||
|
|
family = x->outer_mode->afinfo->family;
|
||
|
|
|
||
|
|
err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
|
||
|
|
if (err < 0) {
|
||
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
|
||
|
|
goto drop;
|
||
|
|
}
|
||
|
|
} while (!err);
|
||
|
|
|
||
|
|
err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
|
||
|
|
if (err)
|
||
|
|
goto drop;
|
||
|
|
|
||
|
|
nf_reset(skb);
|
||
|
|
|
||
|
|
if (decaps) {
|
||
|
|
if (skb->sp)
|
||
|
|
skb->sp->olen = 0;
|
||
|
|
skb_dst_drop(skb);
|
||
|
|
gro_cells_receive(&gro_cells, skb);
|
||
|
|
return 0;
|
||
|
|
} else {
|
||
|
|
xo = xfrm_offload(skb);
|
||
|
|
if (xo)
|
||
|
|
xfrm_gro = xo->flags & XFRM_GRO;
|
||
|
|
|
||
|
|
err = x->inner_mode->afinfo->transport_finish(skb, xfrm_gro || async);
|
||
|
|
if (xfrm_gro) {
|
||
|
|
if (skb->sp)
|
||
|
|
skb->sp->olen = 0;
|
||
|
|
skb_dst_drop(skb);
|
||
|
|
gro_cells_receive(&gro_cells, skb);
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
drop_unlock:
|
||
|
|
spin_unlock(&x->lock);
|
||
|
|
drop:
|
||
|
|
xfrm_rcv_cb(skb, family, x && x->type ? x->type->proto : nexthdr, -1);
|
||
|
|
kfree_skb(skb);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(xfrm_input);
|
||
|
|
|
||
|
|
int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
|
||
|
|
{
|
||
|
|
return xfrm_input(skb, nexthdr, 0, -1);
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(xfrm_input_resume);
|
||
|
|
|
||
|
|
static void xfrm_trans_reinject(unsigned long data)
|
||
|
|
{
|
||
|
|
struct xfrm_trans_tasklet *trans = (void *)data;
|
||
|
|
struct sk_buff_head queue;
|
||
|
|
struct sk_buff *skb;
|
||
|
|
|
||
|
|
__skb_queue_head_init(&queue);
|
||
|
|
skb_queue_splice_init(&trans->queue, &queue);
|
||
|
|
|
||
|
|
while ((skb = __skb_dequeue(&queue)))
|
||
|
|
XFRM_TRANS_SKB_CB(skb)->finish(dev_net(skb->dev), NULL, skb);
|
||
|
|
}
|
||
|
|
|
||
|
|
int xfrm_trans_queue(struct sk_buff *skb,
|
||
|
|
int (*finish)(struct net *, struct sock *,
|
||
|
|
struct sk_buff *))
|
||
|
|
{
|
||
|
|
struct xfrm_trans_tasklet *trans;
|
||
|
|
|
||
|
|
trans = this_cpu_ptr(&xfrm_trans_tasklet);
|
||
|
|
|
||
|
|
if (skb_queue_len(&trans->queue) >= netdev_max_backlog)
|
||
|
|
return -ENOBUFS;
|
||
|
|
|
||
|
|
XFRM_TRANS_SKB_CB(skb)->finish = finish;
|
||
|
|
__skb_queue_tail(&trans->queue, skb);
|
||
|
|
tasklet_schedule(&trans->tasklet);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL(xfrm_trans_queue);
|
||
|
|
|
||
|
|
void __init xfrm_input_init(void)
|
||
|
|
{
|
||
|
|
int err;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
init_dummy_netdev(&xfrm_napi_dev);
|
||
|
|
err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
|
||
|
|
if (err)
|
||
|
|
gro_cells.cells = NULL;
|
||
|
|
|
||
|
|
secpath_cachep = kmem_cache_create("secpath_cache",
|
||
|
|
sizeof(struct sec_path),
|
||
|
|
0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
|
||
|
|
NULL);
|
||
|
|
|
||
|
|
for_each_possible_cpu(i) {
|
||
|
|
struct xfrm_trans_tasklet *trans;
|
||
|
|
|
||
|
|
trans = &per_cpu(xfrm_trans_tasklet, i);
|
||
|
|
__skb_queue_head_init(&trans->queue);
|
||
|
|
tasklet_init(&trans->tasklet, xfrm_trans_reinject,
|
||
|
|
(unsigned long)trans);
|
||
|
|
}
|
||
|
|
}
|