diff options
Diffstat (limited to '')
| -rw-r--r-- | net/ipv6/xfrm6_input.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c new file mode 100644 index 000000000..9ef490ddd --- /dev/null +++ b/net/ipv6/xfrm6_input.c @@ -0,0 +1,162 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * xfrm6_input.c: based on net/ipv4/xfrm4_input.c + * + * Authors: + * Mitsuru KANDA @USAGI + * Kazunori MIYAZAWA @USAGI + * Kunihiro Ishiguro <kunihiro@ipinfusion.com> + * YOSHIFUJI Hideaki @USAGI + * IPv6 support + */ + +#include <linux/module.h> +#include <linux/string.h> +#include <linux/netfilter.h> +#include <linux/netfilter_ipv6.h> +#include <net/ipv6.h> +#include <net/xfrm.h> + +int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb) +{ + return xfrm6_extract_header(skb); +} + +int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi, + struct ip6_tnl *t) +{ + XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t; + XFRM_SPI_SKB_CB(skb)->family = AF_INET6; + XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr); + return xfrm_input(skb, nexthdr, spi, 0); +} +EXPORT_SYMBOL(xfrm6_rcv_spi); + +static int xfrm6_transport_finish2(struct net *net, struct sock *sk, + struct sk_buff *skb) +{ + if (xfrm_trans_queue(skb, ip6_rcv_finish)) + __kfree_skb(skb); + return -1; +} + +int xfrm6_transport_finish(struct sk_buff *skb, int async) +{ + struct xfrm_offload *xo = xfrm_offload(skb); + int nhlen = skb->data - skb_network_header(skb); + + skb_network_header(skb)[IP6CB(skb)->nhoff] = + XFRM_MODE_SKB_CB(skb)->protocol; + +#ifndef CONFIG_NETFILTER + if (!async) + return 1; +#endif + + __skb_push(skb, nhlen); + ipv6_hdr(skb)->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); + skb_postpush_rcsum(skb, skb_network_header(skb), nhlen); + + if (xo && (xo->flags & XFRM_GRO)) { + skb_mac_header_rebuild(skb); + skb_reset_transport_header(skb); + return -1; + } + + NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, + dev_net(skb->dev), NULL, skb, skb->dev, NULL, + xfrm6_transport_finish2); + return -1; +} + +int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t) +{ + return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff], + 0, t); +} +EXPORT_SYMBOL(xfrm6_rcv_tnl); + +int xfrm6_rcv(struct sk_buff *skb) +{ + return xfrm6_rcv_tnl(skb, NULL); +} +EXPORT_SYMBOL(xfrm6_rcv); +int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr, + xfrm_address_t *saddr, u8 proto) +{ + struct net *net = dev_net(skb->dev); + struct xfrm_state *x = NULL; + int i = 0; + + if (secpath_set(skb)) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); + goto drop; + } + + if (1 + skb->sp->len == XFRM_MAX_DEPTH) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); + goto drop; + } + + for (i = 0; i < 3; i++) { + xfrm_address_t *dst, *src; + + switch (i) { + case 0: + dst = daddr; + src = saddr; + break; + case 1: + /* lookup state with wild-card source address */ + dst = daddr; + src = (xfrm_address_t *)&in6addr_any; + break; + default: + /* lookup state with wild-card addresses */ + dst = (xfrm_address_t *)&in6addr_any; + src = (xfrm_address_t *)&in6addr_any; + break; + } + + x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6); + if (!x) + continue; + + spin_lock(&x->lock); + + if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) && + likely(x->km.state == XFRM_STATE_VALID) && + !xfrm_state_check_expire(x)) { + spin_unlock(&x->lock); + if (x->type->input(x, skb) > 0) { + /* found a valid state */ + break; + } + } else + spin_unlock(&x->lock); + + xfrm_state_put(x); + x = NULL; + } + + if (!x) { + XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); + xfrm_audit_state_notfound_simple(skb, AF_INET6); + goto drop; + } + + skb->sp->xvec[skb->sp->len++] = x; + + spin_lock(&x->lock); + + x->curlft.bytes += skb->len; + x->curlft.packets++; + + spin_unlock(&x->lock); + + return 1; + +drop: + return -1; +} +EXPORT_SYMBOL(xfrm6_input_addr); |