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0b41713b60
This introduces a helper function to be called only by network drivers that wraps calls to icmp[v6]_send in a conntrack transformation, in case NAT has been used. We don't want to pollute the non-driver path, though, so we introduce this as a helper to be called by places that actually make use of this, as suggested by Florian. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com> Cc: Florian Westphal <fw@strlen.de> Signed-off-by: David S. Miller <davem@davemloft.net>
82 lines
1.9 KiB
C
82 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/export.h>
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#include <linux/icmpv6.h>
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#include <linux/mutex.h>
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#include <linux/netdevice.h>
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#include <linux/spinlock.h>
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#include <net/ipv6.h>
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#if IS_ENABLED(CONFIG_IPV6)
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static ip6_icmp_send_t __rcu *ip6_icmp_send;
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int inet6_register_icmp_sender(ip6_icmp_send_t *fn)
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{
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return (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, NULL, fn) == NULL) ?
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0 : -EBUSY;
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}
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EXPORT_SYMBOL(inet6_register_icmp_sender);
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int inet6_unregister_icmp_sender(ip6_icmp_send_t *fn)
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{
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int ret;
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ret = (cmpxchg((ip6_icmp_send_t **)&ip6_icmp_send, fn, NULL) == fn) ?
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0 : -EINVAL;
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synchronize_net();
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return ret;
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}
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EXPORT_SYMBOL(inet6_unregister_icmp_sender);
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void icmpv6_send(struct sk_buff *skb, u8 type, u8 code, __u32 info)
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{
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ip6_icmp_send_t *send;
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rcu_read_lock();
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send = rcu_dereference(ip6_icmp_send);
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if (!send)
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goto out;
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send(skb, type, code, info, NULL);
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out:
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rcu_read_unlock();
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}
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EXPORT_SYMBOL(icmpv6_send);
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#if IS_ENABLED(CONFIG_NF_NAT)
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#include <net/netfilter/nf_conntrack.h>
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void icmpv6_ndo_send(struct sk_buff *skb_in, u8 type, u8 code, __u32 info)
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{
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struct sk_buff *cloned_skb = NULL;
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enum ip_conntrack_info ctinfo;
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struct in6_addr orig_ip;
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struct nf_conn *ct;
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ct = nf_ct_get(skb_in, &ctinfo);
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if (!ct || !(ct->status & IPS_SRC_NAT)) {
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icmpv6_send(skb_in, type, code, info);
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return;
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}
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if (skb_shared(skb_in))
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skb_in = cloned_skb = skb_clone(skb_in, GFP_ATOMIC);
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if (unlikely(!skb_in || skb_network_header(skb_in) < skb_in->head ||
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(skb_network_header(skb_in) + sizeof(struct ipv6hdr)) >
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skb_tail_pointer(skb_in) || skb_ensure_writable(skb_in,
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skb_network_offset(skb_in) + sizeof(struct ipv6hdr))))
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goto out;
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orig_ip = ipv6_hdr(skb_in)->saddr;
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ipv6_hdr(skb_in)->saddr = ct->tuplehash[0].tuple.src.u3.in6;
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icmpv6_send(skb_in, type, code, info);
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ipv6_hdr(skb_in)->saddr = orig_ip;
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out:
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consume_skb(cloned_skb);
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}
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EXPORT_SYMBOL(icmpv6_ndo_send);
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#endif
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#endif
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