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96 lines
2.3 KiB
96 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* xfrm6_output.c - Common IPsec encapsulation code for IPv6. |
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* Copyright (C) 2002 USAGI/WIDE Project |
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* Copyright (c) 2004 Herbert Xu <[email protected]> |
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*/ |
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#include <linux/if_ether.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/skbuff.h> |
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#include <linux/icmpv6.h> |
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#include <linux/netfilter_ipv6.h> |
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#include <net/dst.h> |
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#include <net/ipv6.h> |
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#include <net/ip6_route.h> |
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#include <net/xfrm.h> |
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void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu) |
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{ |
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struct flowi6 fl6; |
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struct sock *sk = skb->sk; |
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fl6.flowi6_oif = sk->sk_bound_dev_if; |
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fl6.daddr = ipv6_hdr(skb)->daddr; |
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ipv6_local_rxpmtu(sk, &fl6, mtu); |
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} |
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void xfrm6_local_error(struct sk_buff *skb, u32 mtu) |
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{ |
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struct flowi6 fl6; |
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const struct ipv6hdr *hdr; |
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struct sock *sk = skb->sk; |
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hdr = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb); |
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fl6.fl6_dport = inet_sk(sk)->inet_dport; |
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fl6.daddr = hdr->daddr; |
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ipv6_local_error(sk, EMSGSIZE, &fl6, mtu); |
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} |
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static int __xfrm6_output_finish(struct net *net, struct sock *sk, struct sk_buff *skb) |
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{ |
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return xfrm_output(sk, skb); |
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} |
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static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
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{ |
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struct dst_entry *dst = skb_dst(skb); |
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struct xfrm_state *x = dst->xfrm; |
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unsigned int mtu; |
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bool toobig; |
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#ifdef CONFIG_NETFILTER |
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if (!x) { |
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IP6CB(skb)->flags |= IP6SKB_REROUTED; |
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return dst_output(net, sk, skb); |
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} |
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#endif |
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if (x->props.mode != XFRM_MODE_TUNNEL) |
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goto skip_frag; |
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if (skb->protocol == htons(ETH_P_IPV6)) |
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mtu = ip6_skb_dst_mtu(skb); |
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else |
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mtu = dst_mtu(skb_dst(skb)); |
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toobig = skb->len > mtu && !skb_is_gso(skb); |
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if (toobig && xfrm6_local_dontfrag(skb->sk)) { |
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xfrm6_local_rxpmtu(skb, mtu); |
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kfree_skb(skb); |
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return -EMSGSIZE; |
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} else if (!skb->ignore_df && toobig && skb->sk) { |
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xfrm_local_error(skb, mtu); |
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kfree_skb(skb); |
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return -EMSGSIZE; |
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} |
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if (toobig || dst_allfrag(skb_dst(skb))) |
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return ip6_fragment(net, sk, skb, |
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__xfrm6_output_finish); |
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skip_frag: |
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return xfrm_output(sk, skb); |
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} |
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int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb) |
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{ |
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return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, |
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net, sk, skb, skb->dev, skb_dst(skb)->dev, |
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__xfrm6_output, |
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!(IP6CB(skb)->flags & IP6SKB_REROUTED)); |
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}
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