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[IPv6] route: Fix prohibit and blackhole routing decision
Lookups resolving to ip6_blk_hole_entry must result in silently discarding the packets whereas an ip6_pkt_prohibit_entry is supposed to cause an ICMPV6_ADM_PROHIBITED message to be sent. Thanks to Kim Nordlund <kim.nordlund@nokia.com> for noticing this bug. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
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3a31b9d2f2
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@ -94,6 +94,9 @@ static int ip6_dst_gc(void);
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static int ip6_pkt_discard(struct sk_buff *skb);
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static int ip6_pkt_discard_out(struct sk_buff *skb);
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static int ip6_pkt_prohibit(struct sk_buff *skb);
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static int ip6_pkt_prohibit_out(struct sk_buff *skb);
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static int ip6_pkt_blk_hole(struct sk_buff *skb);
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static void ip6_link_failure(struct sk_buff *skb);
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static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu);
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@ -150,8 +153,8 @@ struct rt6_info ip6_prohibit_entry = {
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.obsolete = -1,
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.error = -EACCES,
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.metrics = { [RTAX_HOPLIMIT - 1] = 255, },
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.input = ip6_pkt_discard,
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.output = ip6_pkt_discard_out,
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.input = ip6_pkt_prohibit,
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.output = ip6_pkt_prohibit_out,
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.ops = &ip6_dst_ops,
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.path = (struct dst_entry*)&ip6_prohibit_entry,
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}
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@ -170,8 +173,8 @@ struct rt6_info ip6_blk_hole_entry = {
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.obsolete = -1,
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.error = -EINVAL,
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.metrics = { [RTAX_HOPLIMIT - 1] = 255, },
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.input = ip6_pkt_discard,
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.output = ip6_pkt_discard_out,
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.input = ip6_pkt_blk_hole,
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.output = ip6_pkt_blk_hole,
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.ops = &ip6_dst_ops,
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.path = (struct dst_entry*)&ip6_blk_hole_entry,
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}
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@ -1742,24 +1745,46 @@ int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
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* Drop the packet on the floor
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*/
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static int ip6_pkt_discard(struct sk_buff *skb)
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static inline int ip6_pkt_drop(struct sk_buff *skb, int code)
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{
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int type = ipv6_addr_type(&skb->nh.ipv6h->daddr);
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if (type == IPV6_ADDR_ANY || type == IPV6_ADDR_RESERVED)
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IP6_INC_STATS(IPSTATS_MIB_INADDRERRORS);
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IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
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icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev);
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icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0, skb->dev);
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kfree_skb(skb);
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return 0;
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}
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static int ip6_pkt_discard(struct sk_buff *skb)
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{
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return ip6_pkt_drop(skb, ICMPV6_NOROUTE);
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}
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static int ip6_pkt_discard_out(struct sk_buff *skb)
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{
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skb->dev = skb->dst->dev;
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return ip6_pkt_discard(skb);
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}
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static int ip6_pkt_prohibit(struct sk_buff *skb)
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{
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return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED);
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}
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static int ip6_pkt_prohibit_out(struct sk_buff *skb)
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{
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skb->dev = skb->dst->dev;
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return ip6_pkt_prohibit(skb);
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}
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static int ip6_pkt_blk_hole(struct sk_buff *skb)
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{
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kfree_skb(skb);
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return 0;
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}
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/*
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* Allocate a dst for local (unicast / anycast) address.
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*/
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