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f895f0cfbb
Conflicts: net/ipv4/ip_vti.c Steffen Klassert says: ==================== pull request (net): ipsec 2014-05-15 This pull request has a merge conflict in net/ipv4/ip_vti.c between commit8d89dcdf80("vti: don't allow to add the same tunnel twice") and commita32452366b("vti4:Don't count header length twice"). It can be solved like it is done in linux-next. 1) Fix a ipv6 xfrm output crash when a packet is rerouted by netfilter to not use IPsec. 2) vti4 counts some header lengths twice leading to an incorrect device mtu. Fix this by counting these headers only once. 3) We don't catch the case if an unsupported protocol is submitted to the xfrm protocol handlers, this can lead to NULL pointer dereferences. Fix this by adding the appropriate checks. 4) vti6 may unregister pernet ops twice on init errors. Fix this by removing one of the calls to do it only once. From Mathias Krause. 5) Set the vti tunnel mark before doing a lookup in the error handlers. Otherwise we don't find the correct xfrm state. ==================== The conflict in ip_vti.c was simple, 'net' had a commit removing a line from vti_tunnel_init() and this tree being merged had a commit adding a line to the same location. Signed-off-by: David S. Miller <davem@davemloft.net>
175 lines
3.8 KiB
C
175 lines
3.8 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/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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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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EXPORT_SYMBOL(xfrm6_find_1stfragopt);
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static int xfrm6_local_dontfrag(struct sk_buff *skb)
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{
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int proto;
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struct sock *sk = skb->sk;
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if (sk) {
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if (sk->sk_family != AF_INET6)
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return 0;
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proto = sk->sk_protocol;
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if (proto == IPPROTO_UDP || proto == IPPROTO_RAW)
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return inet6_sk(sk)->dontfrag;
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}
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return 0;
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}
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static 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_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(skb);
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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->local_df && skb->len > mtu) {
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skb->dev = dst->dev;
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if (xfrm6_local_dontfrag(skb))
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xfrm6_local_rxpmtu(skb, mtu);
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else if (skb->sk)
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xfrm_local_error(skb, mtu);
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else
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icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
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ret = -EMSGSIZE;
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}
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return ret;
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}
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int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err;
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err = xfrm6_tunnel_check_size(skb);
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if (err)
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return err;
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XFRM_MODE_SKB_CB(skb)->protocol = ipv6_hdr(skb)->nexthdr;
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return xfrm6_extract_header(skb);
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}
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int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
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{
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int err;
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err = xfrm_inner_extract_output(x, skb);
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if (err)
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return err;
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skb->local_df = 1;
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return x->outer_mode->output2(x, skb);
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}
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EXPORT_SYMBOL(xfrm6_prepare_output);
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int xfrm6_output_finish(struct sk_buff *skb)
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{
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memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
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skb->protocol = htons(ETH_P_IPV6);
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#ifdef CONFIG_NETFILTER
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IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
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#endif
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return xfrm_output(skb);
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}
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static int __xfrm6_output(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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int mtu;
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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(skb);
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}
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#endif
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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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if (skb->len > mtu && xfrm6_local_dontfrag(skb)) {
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xfrm6_local_rxpmtu(skb, mtu);
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return -EMSGSIZE;
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} else if (!skb->local_df && skb->len > mtu && skb->sk) {
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xfrm_local_error(skb, mtu);
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return -EMSGSIZE;
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}
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if (x->props.mode == XFRM_MODE_TUNNEL &&
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((skb->len > mtu && !skb_is_gso(skb)) ||
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dst_allfrag(skb_dst(skb)))) {
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return ip6_fragment(skb, x->outer_mode->afinfo->output_finish);
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}
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return x->outer_mode->afinfo->output_finish(skb);
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}
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int xfrm6_output(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, skb,
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NULL, skb_dst(skb)->dev, __xfrm6_output,
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!(IP6CB(skb)->flags & IP6SKB_REROUTED));
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}
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