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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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aee5adb430
On current kernel, ip6_find_1stfragopt() is used by IPv6 IPsec to find offset to be inserted header in outbound for transport mode. (BTW, no usage may be needed for IPv4 case.) Mobile IPv6 requires another logic for routing header and destination options header respectively. This patch is common platform for the offset and adopts it to IPsec. Based on MIPL2 kernel patch. Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
166 lines
3.2 KiB
C
166 lines
3.2 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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int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
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u8 **prevhdr)
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{
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return ip6_find_1stfragopt(skb, prevhdr);
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}
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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_PARTIAL) {
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err = skb_checksum_help(skb);
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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 == XFRM_MODE_TUNNEL) {
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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 != XFRM_MODE_TUNNEL));
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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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