ASR_BASE
Change-Id: Icf3719cc0afe3eeb3edc7fa80a2eb5199ca9dda1
diff --git a/marvell/linux/net/xfrm/xfrm_input.c b/marvell/linux/net/xfrm/xfrm_input.c
new file mode 100644
index 0000000..2e7fd0a
--- /dev/null
+++ b/marvell/linux/net/xfrm/xfrm_input.c
@@ -0,0 +1,815 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * xfrm_input.c
+ *
+ * Changes:
+ * YOSHIFUJI Hideaki @USAGI
+ * Split up af-specific portion
+ *
+ */
+
+#include <linux/bottom_half.h>
+#include <linux/cache.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/percpu.h>
+#include <net/dst.h>
+#include <net/ip.h>
+#include <net/xfrm.h>
+#include <net/ip_tunnels.h>
+#include <net/ip6_tunnel.h>
+
+#include "xfrm_inout.h"
+
+struct xfrm_trans_tasklet {
+ struct tasklet_struct tasklet;
+ struct sk_buff_head queue;
+};
+
+struct xfrm_trans_cb {
+ union {
+ struct inet_skb_parm h4;
+#if IS_ENABLED(CONFIG_IPV6)
+ struct inet6_skb_parm h6;
+#endif
+ } header;
+ int (*finish)(struct net *net, struct sock *sk, struct sk_buff *skb);
+};
+
+#define XFRM_TRANS_SKB_CB(__skb) ((struct xfrm_trans_cb *)&((__skb)->cb[0]))
+
+static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
+static struct xfrm_input_afinfo const __rcu *xfrm_input_afinfo[AF_INET6 + 1];
+
+static struct gro_cells gro_cells;
+static struct net_device xfrm_napi_dev;
+
+static DEFINE_PER_CPU(struct xfrm_trans_tasklet, xfrm_trans_tasklet);
+
+int xfrm_input_register_afinfo(const struct xfrm_input_afinfo *afinfo)
+{
+ int err = 0;
+
+ if (WARN_ON(afinfo->family >= ARRAY_SIZE(xfrm_input_afinfo)))
+ return -EAFNOSUPPORT;
+
+ spin_lock_bh(&xfrm_input_afinfo_lock);
+ if (unlikely(xfrm_input_afinfo[afinfo->family] != NULL))
+ err = -EEXIST;
+ else
+ rcu_assign_pointer(xfrm_input_afinfo[afinfo->family], afinfo);
+ spin_unlock_bh(&xfrm_input_afinfo_lock);
+ return err;
+}
+EXPORT_SYMBOL(xfrm_input_register_afinfo);
+
+int xfrm_input_unregister_afinfo(const struct xfrm_input_afinfo *afinfo)
+{
+ int err = 0;
+
+ spin_lock_bh(&xfrm_input_afinfo_lock);
+ if (likely(xfrm_input_afinfo[afinfo->family] != NULL)) {
+ if (unlikely(xfrm_input_afinfo[afinfo->family] != afinfo))
+ err = -EINVAL;
+ else
+ RCU_INIT_POINTER(xfrm_input_afinfo[afinfo->family], NULL);
+ }
+ spin_unlock_bh(&xfrm_input_afinfo_lock);
+ synchronize_rcu();
+ return err;
+}
+EXPORT_SYMBOL(xfrm_input_unregister_afinfo);
+
+static const struct xfrm_input_afinfo *xfrm_input_get_afinfo(unsigned int family)
+{
+ const struct xfrm_input_afinfo *afinfo;
+
+ if (WARN_ON_ONCE(family >= ARRAY_SIZE(xfrm_input_afinfo)))
+ return NULL;
+
+ rcu_read_lock();
+ afinfo = rcu_dereference(xfrm_input_afinfo[family]);
+ if (unlikely(!afinfo))
+ rcu_read_unlock();
+ return afinfo;
+}
+
+static int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family, u8 protocol,
+ int err)
+{
+ int ret;
+ const struct xfrm_input_afinfo *afinfo = xfrm_input_get_afinfo(family);
+
+ if (!afinfo)
+ return -EAFNOSUPPORT;
+
+ ret = afinfo->callback(skb, protocol, err);
+ rcu_read_unlock();
+
+ return ret;
+}
+
+struct sec_path *secpath_set(struct sk_buff *skb)
+{
+ struct sec_path *sp, *tmp = skb_ext_find(skb, SKB_EXT_SEC_PATH);
+
+ sp = skb_ext_add(skb, SKB_EXT_SEC_PATH);
+ if (!sp)
+ return NULL;
+
+ if (tmp) /* reused existing one (was COW'd if needed) */
+ return sp;
+
+ /* allocated new secpath */
+ memset(sp->ovec, 0, sizeof(sp->ovec));
+ sp->olen = 0;
+ sp->len = 0;
+
+ return sp;
+}
+EXPORT_SYMBOL(secpath_set);
+
+/* Fetch spi and seq from ipsec header */
+
+int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
+{
+ int offset, offset_seq;
+ int hlen;
+
+ switch (nexthdr) {
+ case IPPROTO_AH:
+ hlen = sizeof(struct ip_auth_hdr);
+ offset = offsetof(struct ip_auth_hdr, spi);
+ offset_seq = offsetof(struct ip_auth_hdr, seq_no);
+ break;
+ case IPPROTO_ESP:
+ hlen = sizeof(struct ip_esp_hdr);
+ offset = offsetof(struct ip_esp_hdr, spi);
+ offset_seq = offsetof(struct ip_esp_hdr, seq_no);
+ break;
+ case IPPROTO_COMP:
+ if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr)))
+ return -EINVAL;
+ *spi = htonl(ntohs(*(__be16 *)(skb_transport_header(skb) + 2)));
+ *seq = 0;
+ return 0;
+ default:
+ return 1;
+ }
+
+ if (!pskb_may_pull(skb, hlen))
+ return -EINVAL;
+
+ *spi = *(__be32 *)(skb_transport_header(skb) + offset);
+ *seq = *(__be32 *)(skb_transport_header(skb) + offset_seq);
+ return 0;
+}
+EXPORT_SYMBOL(xfrm_parse_spi);
+
+static int xfrm4_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct iphdr *iph;
+ int optlen = 0;
+ int err = -EINVAL;
+
+ if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) {
+ struct ip_beet_phdr *ph;
+ int phlen;
+
+ if (!pskb_may_pull(skb, sizeof(*ph)))
+ goto out;
+
+ ph = (struct ip_beet_phdr *)skb->data;
+
+ phlen = sizeof(*ph) + ph->padlen;
+ optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen);
+ if (optlen < 0 || optlen & 3 || optlen > 250)
+ goto out;
+
+ XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr;
+
+ if (!pskb_may_pull(skb, phlen))
+ goto out;
+ __skb_pull(skb, phlen);
+ }
+
+ skb_push(skb, sizeof(*iph));
+ skb_reset_network_header(skb);
+ skb_mac_header_rebuild(skb);
+
+ xfrm4_beet_make_header(skb);
+
+ iph = ip_hdr(skb);
+
+ iph->ihl += optlen / 4;
+ iph->tot_len = htons(skb->len);
+ iph->daddr = x->sel.daddr.a4;
+ iph->saddr = x->sel.saddr.a4;
+ iph->check = 0;
+ iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
+ err = 0;
+out:
+ return err;
+}
+
+static void ipip_ecn_decapsulate(struct sk_buff *skb)
+{
+ struct iphdr *inner_iph = ipip_hdr(skb);
+
+ if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
+ IP_ECN_set_ce(inner_iph);
+}
+
+static int xfrm4_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
+{
+ int err = -EINVAL;
+
+ if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP)
+ goto out;
+
+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+ goto out;
+
+ err = skb_unclone(skb, GFP_ATOMIC);
+ if (err)
+ goto out;
+
+ if (x->props.flags & XFRM_STATE_DECAP_DSCP)
+ ipv4_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipip_hdr(skb));
+ if (!(x->props.flags & XFRM_STATE_NOECN))
+ ipip_ecn_decapsulate(skb);
+
+ skb_reset_network_header(skb);
+ skb_mac_header_rebuild(skb);
+ if (skb->mac_len)
+ eth_hdr(skb)->h_proto = skb->protocol;
+
+ err = 0;
+
+out:
+ return err;
+}
+
+static void ipip6_ecn_decapsulate(struct sk_buff *skb)
+{
+ struct ipv6hdr *inner_iph = ipipv6_hdr(skb);
+
+ if (INET_ECN_is_ce(XFRM_MODE_SKB_CB(skb)->tos))
+ IP6_ECN_set_ce(skb, inner_iph);
+}
+
+static int xfrm6_remove_tunnel_encap(struct xfrm_state *x, struct sk_buff *skb)
+{
+ int err = -EINVAL;
+
+ if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPV6)
+ goto out;
+ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+ goto out;
+
+ err = skb_unclone(skb, GFP_ATOMIC);
+ if (err)
+ goto out;
+
+ if (x->props.flags & XFRM_STATE_DECAP_DSCP)
+ ipv6_copy_dscp(XFRM_MODE_SKB_CB(skb)->tos, ipipv6_hdr(skb));
+ if (!(x->props.flags & XFRM_STATE_NOECN))
+ ipip6_ecn_decapsulate(skb);
+
+ skb_reset_network_header(skb);
+ skb_mac_header_rebuild(skb);
+ if (skb->mac_len)
+ eth_hdr(skb)->h_proto = skb->protocol;
+
+ err = 0;
+
+out:
+ return err;
+}
+
+static int xfrm6_remove_beet_encap(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct ipv6hdr *ip6h;
+ int size = sizeof(struct ipv6hdr);
+ int err;
+
+ err = skb_cow_head(skb, size + skb->mac_len);
+ if (err)
+ goto out;
+
+ __skb_push(skb, size);
+ skb_reset_network_header(skb);
+ skb_mac_header_rebuild(skb);
+
+ xfrm6_beet_make_header(skb);
+
+ ip6h = ipv6_hdr(skb);
+ ip6h->payload_len = htons(skb->len - size);
+ ip6h->daddr = x->sel.daddr.in6;
+ ip6h->saddr = x->sel.saddr.in6;
+ err = 0;
+out:
+ return err;
+}
+
+/* Remove encapsulation header.
+ *
+ * The IP header will be moved over the top of the encapsulation
+ * header.
+ *
+ * On entry, the transport header shall point to where the IP header
+ * should be and the network header shall be set to where the IP
+ * header currently is. skb->data shall point to the start of the
+ * payload.
+ */
+static int
+xfrm_inner_mode_encap_remove(struct xfrm_state *x,
+ const struct xfrm_mode *inner_mode,
+ struct sk_buff *skb)
+{
+ switch (inner_mode->encap) {
+ case XFRM_MODE_BEET:
+ if (inner_mode->family == AF_INET)
+ return xfrm4_remove_beet_encap(x, skb);
+ if (inner_mode->family == AF_INET6)
+ return xfrm6_remove_beet_encap(x, skb);
+ break;
+ case XFRM_MODE_TUNNEL:
+ if (inner_mode->family == AF_INET)
+ return xfrm4_remove_tunnel_encap(x, skb);
+ if (inner_mode->family == AF_INET6)
+ return xfrm6_remove_tunnel_encap(x, skb);
+ break;
+ }
+
+ WARN_ON_ONCE(1);
+ return -EOPNOTSUPP;
+}
+
+static int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+ const struct xfrm_mode *inner_mode = &x->inner_mode;
+ const struct xfrm_state_afinfo *afinfo;
+ int err = -EAFNOSUPPORT;
+
+ rcu_read_lock();
+ afinfo = xfrm_state_afinfo_get_rcu(x->outer_mode.family);
+ if (likely(afinfo))
+ err = afinfo->extract_input(x, skb);
+ rcu_read_unlock();
+
+ if (err)
+ return err;
+
+ if (x->sel.family == AF_UNSPEC) {
+ inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
+ if (!inner_mode)
+ return -EAFNOSUPPORT;
+ }
+
+ switch (inner_mode->family) {
+ case AF_INET:
+ skb->protocol = htons(ETH_P_IP);
+ break;
+ case AF_INET6:
+ skb->protocol = htons(ETH_P_IPV6);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+
+ return xfrm_inner_mode_encap_remove(x, inner_mode, skb);
+}
+
+/* Remove encapsulation header.
+ *
+ * The IP header will be moved over the top of the encapsulation header.
+ *
+ * On entry, skb_transport_header() shall point to where the IP header
+ * should be and skb_network_header() shall be set to where the IP header
+ * currently is. skb->data shall point to the start of the payload.
+ */
+static int xfrm4_transport_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+ struct xfrm_offload *xo = xfrm_offload(skb);
+ int ihl = skb->data - skb_transport_header(skb);
+
+ if (skb->transport_header != skb->network_header) {
+ memmove(skb_transport_header(skb),
+ skb_network_header(skb), ihl);
+ if (xo)
+ xo->orig_mac_len =
+ skb_mac_header_was_set(skb) ? skb_mac_header_len(skb) : 0;
+ skb->network_header = skb->transport_header;
+ }
+ ip_hdr(skb)->tot_len = htons(skb->len + ihl);
+ skb_reset_transport_header(skb);
+ return 0;
+}
+
+static int xfrm6_transport_input(struct xfrm_state *x, struct sk_buff *skb)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+ struct xfrm_offload *xo = xfrm_offload(skb);
+ int ihl = skb->data - skb_transport_header(skb);
+
+ if (skb->transport_header != skb->network_header) {
+ memmove(skb_transport_header(skb),
+ skb_network_header(skb), ihl);
+ if (xo)
+ xo->orig_mac_len =
+ skb_mac_header_was_set(skb) ? skb_mac_header_len(skb) : 0;
+ skb->network_header = skb->transport_header;
+ }
+ ipv6_hdr(skb)->payload_len = htons(skb->len + ihl -
+ sizeof(struct ipv6hdr));
+ skb_reset_transport_header(skb);
+ return 0;
+#else
+ WARN_ON_ONCE(1);
+ return -EAFNOSUPPORT;
+#endif
+}
+
+static int xfrm_inner_mode_input(struct xfrm_state *x,
+ const struct xfrm_mode *inner_mode,
+ struct sk_buff *skb)
+{
+ switch (inner_mode->encap) {
+ case XFRM_MODE_BEET:
+ case XFRM_MODE_TUNNEL:
+ return xfrm_prepare_input(x, skb);
+ case XFRM_MODE_TRANSPORT:
+ if (inner_mode->family == AF_INET)
+ return xfrm4_transport_input(x, skb);
+ if (inner_mode->family == AF_INET6)
+ return xfrm6_transport_input(x, skb);
+ break;
+ case XFRM_MODE_ROUTEOPTIMIZATION:
+ WARN_ON_ONCE(1);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+
+ return -EOPNOTSUPP;
+}
+
+int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
+{
+ const struct xfrm_state_afinfo *afinfo;
+ struct net *net = dev_net(skb->dev);
+ const struct xfrm_mode *inner_mode;
+ int err;
+ __be32 seq;
+ __be32 seq_hi;
+ struct xfrm_state *x = NULL;
+ xfrm_address_t *daddr;
+ u32 mark = skb->mark;
+ unsigned int family = AF_UNSPEC;
+ int decaps = 0;
+ int async = 0;
+ bool xfrm_gro = false;
+ bool crypto_done = false;
+ struct xfrm_offload *xo = xfrm_offload(skb);
+ 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(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;
+
+ 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);
+ }
+}