161 lines
3.1 KiB
C
161 lines
3.1 KiB
C
/*
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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 <herbert@gondor.apana.org.au>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/compiler.h>
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#include <linux/skbuff.h>
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#include <linux/spinlock.h>
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#include <linux/icmpv6.h>
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#include <linux/netfilter_ipv6.h>
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#include <net/ipv6.h>
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#include <net/xfrm.h>
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static int xfrm6_tunnel_check_size(struct sk_buff *skb)
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{
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int mtu, ret = 0;
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struct dst_entry *dst = skb->dst;
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mtu = dst_mtu(dst);
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if (mtu < IPV6_MIN_MTU)
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mtu = IPV6_MIN_MTU;
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if (skb->len > mtu) {
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skb->dev = dst->dev;
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icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
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ret = -EMSGSIZE;
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}
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return ret;
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}
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static int xfrm6_output_one(struct sk_buff *skb)
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{
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struct dst_entry *dst = skb->dst;
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struct xfrm_state *x = dst->xfrm;
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int err;
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if (skb->ip_summed == CHECKSUM_HW) {
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err = skb_checksum_help(skb, 0);
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if (err)
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goto error_nolock;
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}
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if (x->props.mode) {
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err = xfrm6_tunnel_check_size(skb);
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if (err)
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goto error_nolock;
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}
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do {
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spin_lock_bh(&x->lock);
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err = xfrm_state_check(x, skb);
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if (err)
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goto error;
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err = x->mode->output(skb);
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if (err)
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goto error;
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err = x->type->output(x, skb);
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if (err)
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goto error;
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x->curlft.bytes += skb->len;
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x->curlft.packets++;
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spin_unlock_bh(&x->lock);
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skb->nh.raw = skb->data;
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if (!(skb->dst = dst_pop(dst))) {
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err = -EHOSTUNREACH;
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goto error_nolock;
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}
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dst = skb->dst;
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x = dst->xfrm;
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} while (x && !x->props.mode);
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IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
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err = 0;
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out_exit:
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return err;
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error:
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spin_unlock_bh(&x->lock);
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error_nolock:
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kfree_skb(skb);
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goto out_exit;
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}
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static int xfrm6_output_finish2(struct sk_buff *skb)
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{
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int err;
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while (likely((err = xfrm6_output_one(skb)) == 0)) {
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nf_reset(skb);
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err = nf_hook(PF_INET6, NF_IP6_LOCAL_OUT, &skb, NULL,
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skb->dst->dev, dst_output);
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if (unlikely(err != 1))
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break;
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if (!skb->dst->xfrm)
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return dst_output(skb);
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err = nf_hook(PF_INET6, NF_IP6_POST_ROUTING, &skb, NULL,
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skb->dst->dev, xfrm6_output_finish2);
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if (unlikely(err != 1))
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break;
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}
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return err;
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}
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static int xfrm6_output_finish(struct sk_buff *skb)
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{
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struct sk_buff *segs;
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if (!skb_is_gso(skb))
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return xfrm6_output_finish2(skb);
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skb->protocol = htons(ETH_P_IPV6);
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segs = skb_gso_segment(skb, 0);
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kfree_skb(skb);
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if (unlikely(IS_ERR(segs)))
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return PTR_ERR(segs);
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do {
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struct sk_buff *nskb = segs->next;
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int err;
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segs->next = NULL;
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err = xfrm6_output_finish2(segs);
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if (unlikely(err)) {
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while ((segs = nskb)) {
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nskb = segs->next;
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segs->next = NULL;
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kfree_skb(segs);
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}
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return err;
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}
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segs = nskb;
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} while (segs);
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return 0;
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}
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int xfrm6_output(struct sk_buff *skb)
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{
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return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dst->dev,
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xfrm6_output_finish);
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}
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