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![Jakub Kicinski](/assets/img/avatar_default.png)
Steffen Klassert says: ==================== pull request (net): ipsec 2021-01-21 1) Fix a rare panic on SMP systems when packet reordering happens between anti replay check and update. From Shmulik Ladkani. 2) Fix disable_xfrm sysctl when used on xfrm interfaces. From Eyal Birger. 3) Fix a race in PF_KEY when the availability of crypto algorithms is set. From Cong Wang. 4) Fix a return value override in the xfrm policy selftests. From Po-Hsu Lin. 5) Fix an integer wraparound in xfrm_policy_addr_delta. From Visa Hankala. * 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec: xfrm: Fix wraparound in xfrm_policy_addr_delta() selftests: xfrm: fix test return value override issue in xfrm_policy.sh af_key: relax availability checks for skb size calculation xfrm: fix disable_xfrm sysctl when used on xfrm interfaces xfrm: Fix oops in xfrm_replay_advance_bmp ==================== Link: https://lore.kernel.org/r/20210121121558.621339-1-steffen.klassert@secunet.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
823 lines
19 KiB
C
823 lines
19 KiB
C
// 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/cache.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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#include "xfrm_inout.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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union {
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struct inet_skb_parm h4;
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#if IS_ENABLED(CONFIG_IPV6)
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struct inet6_skb_parm h6;
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#endif
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} header;
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int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb);
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struct net *net;
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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 DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
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static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[2][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 > AF_INET6))
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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->is_ipip][afinfo->family]))
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err = -EEXIST;
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else
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rcu_assign_pointer(xfrm_input_afinfo[afinfo->is_ipip][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->is_ipip][afinfo->family])) {
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if (unlikely(xfrm_input_afinfo[afinfo->is_ipip][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->is_ipip][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(u8 family, bool is_ipip)
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{
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const struct xfrm_input_afinfo *afinfo;
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if (WARN_ON_ONCE(family > AF_INET6))
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return NULL;
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rcu_read_lock();
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afinfo = rcu_dereference(xfrm_input_afinfo[is_ipip][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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bool is_ipip = (protocol == IPPROTO_IPIP || protocol == IPPROTO_IPV6);
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const struct xfrm_input_afinfo *afinfo;
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int ret;
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afinfo = xfrm_input_get_afinfo(family, is_ipip);
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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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struct sec_path *secpath_set(struct sk_buff *skb)
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{
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struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH);
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sp = skb_ext_add(skb, SKB_EXT_SEC_PATH);
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if (!sp)
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return NULL;
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if (tmp) /* reused existing one (was COW'd if needed) */
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return sp;
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/* allocated new secpath */
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memset(sp->ovec, 0, sizeof(sp->ovec));
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sp->olen = 0;
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sp->len = 0;
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return sp;
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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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static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct iphdr *iph;
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int optlen = 0;
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int err = -EINVAL;
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if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) {
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struct ip_beet_phdr *ph;
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int phlen;
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if (!pskb_may_pull(skb, sizeof(*ph)))
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goto out;
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ph = (struct ip_beet_phdr *)skb->data;
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phlen = sizeof(*ph) + ph->padlen;
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optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen);
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if (optlen < 0 || optlen & 3 || optlen > 250)
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goto out;
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XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr;
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if (!pskb_may_pull(skb, phlen))
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goto out;
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__skb_pull(skb, phlen);
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}
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skb_push(skb, sizeof(*iph));
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skb_reset_network_header(skb);
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skb_mac_header_rebuild(skb);
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xfrm4_beet_make_header(skb);
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iph = ip_hdr(skb);
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iph->ihl += optlen / 4;
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iph->tot_len = htons(skb->len);
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iph->daddr = x->sel.daddr.a4;
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iph->saddr = x->sel.saddr.a4;
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iph->check = 0;
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iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
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err = 0;
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out:
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return err;
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}
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static void ipip_ecn_decapsulate(struct sk_buff *skb)
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{
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struct iphdr *inner_iph = ipip_hdr(skb);
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if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
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IP_ECN_set_ce(inner_iph);
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}
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static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err = -EINVAL;
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if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP)
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goto out;
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if (!pskb_may_pull(skb, sizeof(struct iphdr)))
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goto out;
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err = skb_unclone(skb, GFP_ATOMIC);
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if (err)
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goto out;
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if (x->props.flags & XFRM_STATE_DECAP_DSCP)
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ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb));
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if (!(x->props.flags & XFRM_STATE_NOECN))
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ipip_ecn_decapsulate(skb);
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skb_reset_network_header(skb);
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skb_mac_header_rebuild(skb);
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if (skb->mac_len)
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eth_hdr(skb)->h_proto = skb->protocol;
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err = 0;
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out:
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return err;
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}
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static void ipip6_ecn_decapsulate(struct sk_buff *skb)
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{
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struct ipv6hdr *inner_iph = ipipv6_hdr(skb);
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if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
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IP6_ECN_set_ce(skb, inner_iph);
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}
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static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err = -EINVAL;
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if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6)
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goto out;
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if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
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goto out;
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err = skb_unclone(skb, GFP_ATOMIC);
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if (err)
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goto out;
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if (x->props.flags & XFRM_STATE_DECAP_DSCP)
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ipv6_copy_dscp(ipv6_get_dsfield(ipv6_hdr(skb)),
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ipipv6_hdr(skb));
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if (!(x->props.flags & XFRM_STATE_NOECN))
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ipip6_ecn_decapsulate(skb);
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skb_reset_network_header(skb);
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skb_mac_header_rebuild(skb);
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if (skb->mac_len)
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eth_hdr(skb)->h_proto = skb->protocol;
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err = 0;
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out:
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return err;
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}
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static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
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{
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struct ipv6hdr *ip6h;
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int size = sizeof(struct ipv6hdr);
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int err;
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err = skb_cow_head(skb, size + skb->mac_len);
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if (err)
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goto out;
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__skb_push(skb, size);
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skb_reset_network_header(skb);
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skb_mac_header_rebuild(skb);
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xfrm6_beet_make_header(skb);
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ip6h = ipv6_hdr(skb);
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ip6h->payload_len = htons(skb->len - size);
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ip6h->daddr = x->sel.daddr.in6;
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ip6h->saddr = x->sel.saddr.in6;
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err = 0;
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out:
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return err;
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}
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/* Remove encapsulation header.
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*
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* The IP header will be moved over the top of the encapsulation
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* header.
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*
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* On entry, the transport header shall point to where the IP header
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* should be and the network header shall be set to where the IP
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* header currently is. skb->data shall point to the start of the
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* payload.
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*/
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static int
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xfrm_inner_mode_encap_remove(struct xfrm_state *x,
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const struct xfrm_mode *inner_mode,
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struct sk_buff *skb)
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{
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switch (inner_mode->encap) {
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case XFRM_MODE_BEET:
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if (inner_mode->family == AF_INET)
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return xfrm4_remove_beet_encap(x, skb);
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if (inner_mode->family == AF_INET6)
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return xfrm6_remove_beet_encap(x, skb);
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break;
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case XFRM_MODE_TUNNEL:
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if (inner_mode->family == AF_INET)
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return xfrm4_remove_tunnel_encap(x, skb);
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if (inner_mode->family == AF_INET6)
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return xfrm6_remove_tunnel_encap(x, skb);
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break;
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}
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WARN_ON_ONCE(1);
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return -EOPNOTSUPP;
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}
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static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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const struct xfrm_mode *inner_mode = &x->inner_mode;
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switch (x->outer_mode.family) {
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case AF_INET:
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xfrm4_extract_header(skb);
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break;
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case AF_INET6:
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xfrm6_extract_header(skb);
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break;
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default:
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WARN_ON_ONCE(1);
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return -EAFNOSUPPORT;
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}
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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)
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return -EAFNOSUPPORT;
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}
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switch (inner_mode->family) {
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case AF_INET:
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skb->protocol = htons(ETH_P_IP);
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break;
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case AF_INET6:
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skb->protocol = htons(ETH_P_IPV6);
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break;
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default:
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WARN_ON_ONCE(1);
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break;
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}
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return xfrm_inner_mode_encap_remove(x, inner_mode, skb);
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}
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|
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/* Remove encapsulation header.
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*
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* The IP header will be moved over the top of the encapsulation header.
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|
*
|
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* On entry, skb_transport_header() shall point to where the IP header
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* should be and skb_network_header() shall be set to where the IP header
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* currently is. skb->data shall point to the start of the payload.
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*/
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static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
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{
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int ihl = skb->data - skb_transport_header(skb);
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if (skb->transport_header != skb->network_header) {
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memmove(skb_transport_header(skb),
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skb_network_header(skb), ihl);
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skb->network_header = skb->transport_header;
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}
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ip_hdr(skb)->tot_len = htons(skb->len + ihl);
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skb_reset_transport_header(skb);
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return 0;
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}
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|
|
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static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
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|
{
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|
#if IS_ENABLED(CONFIG_IPV6)
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int ihl = skb->data - skb_transport_header(skb);
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|
|
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if (skb->transport_header != skb->network_header) {
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memmove(skb_transport_header(skb),
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skb_network_header(skb), ihl);
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skb->network_header = skb->transport_header;
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}
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ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
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sizeof(struct ipv6hdr));
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skb_reset_transport_header(skb);
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return 0;
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|
#else
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WARN_ON_ONCE(1);
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return -EAFNOSUPPORT;
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#endif
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|
}
|
|
|
|
static int xfrm_inner_mode_input(struct xfrm_state *x,
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const struct xfrm_mode *inner_mode,
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|
struct sk_buff *skb)
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|
{
|
|
switch (inner_mode->encap) {
|
|
case XFRM_MODE_BEET:
|
|
case XFRM_MODE_TUNNEL:
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return xfrm_prepare_input(x, skb);
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|
case XFRM_MODE_TRANSPORT:
|
|
if (inner_mode->family == AF_INET)
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return xfrm4_transport_input(x, skb);
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|
if (inner_mode->family == AF_INET6)
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return xfrm6_transport_input(x, skb);
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break;
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case XFRM_MODE_ROUTEOPTIMIZATION:
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|
WARN_ON_ONCE(1);
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|
break;
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|
default:
|
|
WARN_ON_ONCE(1);
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|
break;
|
|
}
|
|
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
|
|
{
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|
const struct xfrm_state_afinfo *afinfo;
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|
struct net *net = dev_net(skb->dev);
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|
const struct xfrm_mode *inner_mode;
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|
int err;
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|
__be32 seq;
|
|
__be32 seq_hi;
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|
struct xfrm_state *x = NULL;
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|
xfrm_address_t *daddr;
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|
u32 mark = skb->mark;
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|
unsigned int family = AF_UNSPEC;
|
|
int decaps = 0;
|
|
int async = 0;
|
|
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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|
struct sec_path *sp;
|
|
|
|
if (encap_type < 0) {
|
|
x = xfrm_input_state(skb);
|
|
|
|
if (unlikely(x->km.state != XFRM_STATE_VALID)) {
|
|
if (x->km.state == XFRM_STATE_ACQ)
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
|
|
else
|
|
XFRM_INC_STATS(net,
|
|
LINUX_MIB_XFRMINSTATEINVALID);
|
|
|
|
if (encap_type == -1)
|
|
dev_put(skb->dev);
|
|
goto drop;
|
|
}
|
|
|
|
family = x->outer_mode.family;
|
|
|
|
/* An encap_type of -1 indicates async resumption. */
|
|
if (encap_type == -1) {
|
|
async = 1;
|
|
seq = XFRM_SKB_CB(skb)->seq.input.low;
|
|
goto resume;
|
|
}
|
|
|
|
/* encap_type < -1 indicates a GRO call. */
|
|
encap_type = 0;
|
|
seq = XFRM_SPI_SKB_CB(skb)->seq;
|
|
|
|
if (xo && (xo->flags & CRYPTO_DONE)) {
|
|
crypto_done = true;
|
|
family = XFRM_SPI_SKB_CB(skb)->family;
|
|
|
|
if (!(xo->status & CRYPTO_SUCCESS)) {
|
|
if (xo->status &
|
|
(CRYPTO_TRANSPORT_AH_AUTH_FAILED |
|
|
CRYPTO_TRANSPORT_ESP_AUTH_FAILED |
|
|
CRYPTO_TUNNEL_AH_AUTH_FAILED |
|
|
CRYPTO_TUNNEL_ESP_AUTH_FAILED)) {
|
|
|
|
xfrm_audit_state_icvfail(x, skb,
|
|
x->type->proto);
|
|
x->stats.integrity_failed++;
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
|
|
goto drop;
|
|
}
|
|
|
|
if (xo->status & CRYPTO_INVALID_PROTOCOL) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
|
|
goto drop;
|
|
}
|
|
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
|
|
goto drop;
|
|
}
|
|
|
|
if ((err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
|
|
goto drop;
|
|
}
|
|
}
|
|
|
|
goto lock;
|
|
}
|
|
|
|
family = XFRM_SPI_SKB_CB(skb)->family;
|
|
|
|
/* if tunnel is present override skb->mark value with tunnel i_key */
|
|
switch (family) {
|
|
case AF_INET:
|
|
if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
|
|
mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4->parms.i_key);
|
|
break;
|
|
case AF_INET6:
|
|
if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
|
|
mark = be32_to_cpu(XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6->parms.i_key);
|
|
break;
|
|
}
|
|
|
|
sp = secpath_set(skb);
|
|
if (!sp) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
|
|
goto drop;
|
|
}
|
|
|
|
seq = 0;
|
|
if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
|
|
secpath_reset(skb);
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
|
|
goto drop;
|
|
}
|
|
|
|
daddr = (xfrm_address_t *)(skb_network_header(skb) +
|
|
XFRM_SPI_SKB_CB(skb)->daddroff);
|
|
do {
|
|
sp = skb_sec_path(skb);
|
|
|
|
if (sp->len == XFRM_MAX_DEPTH) {
|
|
secpath_reset(skb);
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
|
|
goto drop;
|
|
}
|
|
|
|
x = xfrm_state_lookup(net, mark, daddr, spi, nexthdr, family);
|
|
if (x == NULL) {
|
|
secpath_reset(skb);
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
|
|
xfrm_audit_state_notfound(skb, family, spi, seq);
|
|
goto drop;
|
|
}
|
|
|
|
skb->mark = xfrm_smark_get(skb->mark, x);
|
|
|
|
sp->xvec[sp->len++] = x;
|
|
|
|
skb_dst_force(skb);
|
|
if (!skb_dst(skb)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
|
|
goto drop;
|
|
}
|
|
|
|
lock:
|
|
spin_lock(&x->lock);
|
|
|
|
if (unlikely(x->km.state != XFRM_STATE_VALID)) {
|
|
if (x->km.state == XFRM_STATE_ACQ)
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);
|
|
else
|
|
XFRM_INC_STATS(net,
|
|
LINUX_MIB_XFRMINSTATEINVALID);
|
|
goto drop_unlock;
|
|
}
|
|
|
|
if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
|
|
goto drop_unlock;
|
|
}
|
|
|
|
if (x->repl->check(x, skb, seq)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
|
|
goto drop_unlock;
|
|
}
|
|
|
|
if (xfrm_state_check_expire(x)) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
|
|
goto drop_unlock;
|
|
}
|
|
|
|
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;
|
|
|
|
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 (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 (xfrm_inner_mode_input(x, inner_mode, 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.family;
|
|
|
|
err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
|
|
if (err < 0) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
|
|
goto drop;
|
|
}
|
|
crypto_done = false;
|
|
} while (!err);
|
|
|
|
err = xfrm_rcv_cb(skb, family, x->type->proto, 0);
|
|
if (err)
|
|
goto drop;
|
|
|
|
nf_reset_ct(skb);
|
|
|
|
if (decaps) {
|
|
sp = skb_sec_path(skb);
|
|
if (sp)
|
|
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 = -EAFNOSUPPORT;
|
|
rcu_read_lock();
|
|
afinfo = xfrm_state_afinfo_get_rcu(x->inner_mode.family);
|
|
if (likely(afinfo))
|
|
err = afinfo->transport_finish(skb, xfrm_gro || async);
|
|
rcu_read_unlock();
|
|
if (xfrm_gro) {
|
|
sp = skb_sec_path(skb);
|
|
if (sp)
|
|
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(struct tasklet_struct *t)
|
|
{
|
|
struct xfrm_trans_tasklet *trans = from_tasklet(trans, t, tasklet);
|
|
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(XFRM_TRANS_SKB_CB(skb)->net,
|
|
NULL, skb);
|
|
}
|
|
|
|
int xfrm_trans_queue_net(struct net *net, 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;
|
|
|
|
BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb));
|
|
|
|
XFRM_TRANS_SKB_CB(skb)->finish = finish;
|
|
XFRM_TRANS_SKB_CB(skb)->net = net;
|
|
__skb_queue_tail(&trans->queue, skb);
|
|
tasklet_schedule(&trans->tasklet);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(xfrm_trans_queue_net);
|
|
|
|
int xfrm_trans_queue(struct sk_buff *skb,
|
|
int (*finish)(struct net *, struct sock *,
|
|
struct sk_buff *))
|
|
{
|
|
return xfrm_trans_queue_net(dev_net(skb->dev), skb, finish);
|
|
}
|
|
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;
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct xfrm_trans_tasklet *trans;
|
|
|
|
trans = &per_cpu(xfrm_trans_tasklet, i);
|
|
__skb_queue_head_init(&trans->queue);
|
|
tasklet_setup(&trans->tasklet, xfrm_trans_reinject);
|
|
}
|
|
}
|