diff options
Diffstat (limited to 'net/ipv6/ip6_icmp.c')
| -rw-r--r-- | net/ipv6/ip6_icmp.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/net/ipv6/ip6_icmp.c b/net/ipv6/ip6_icmp.c new file mode 100644 index 000000000..e43ea9492 --- /dev/null +++ b/net/ipv6/ip6_icmp.c @@ -0,0 +1,46 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/export.h> +#include <linux/icmpv6.h> +#include <linux/mutex.h> +#include <linux/netdevice.h> +#include <linux/spinlock.h> + +#include <net/ipv6.h> + +#if IS_ENABLED(CONFIG_IPV6) && IS_ENABLED(CONFIG_NF_NAT) + +#include <net/netfilter/nf_conntrack.h> +void icmpv6_ndo_send(struct sk_buff *skb_in, u8 type, u8 code, __u32 info) +{ + struct inet6_skb_parm parm = { 0 }; + struct sk_buff *cloned_skb = NULL; + enum ip_conntrack_info ctinfo; + enum ip_conntrack_dir dir; + struct in6_addr orig_ip; + struct nf_conn *ct; + + ct = nf_ct_get(skb_in, &ctinfo); + if (!ct || !(READ_ONCE(ct->status) & IPS_NAT_MASK)) { + icmp6_send(skb_in, type, code, info, NULL, &parm); + return; + } + + if (skb_shared(skb_in)) + skb_in = cloned_skb = skb_clone(skb_in, GFP_ATOMIC); + + if (unlikely(!skb_in || skb_network_header(skb_in) < skb_in->head || + (skb_network_header(skb_in) + sizeof(struct ipv6hdr)) > + skb_tail_pointer(skb_in) || skb_ensure_writable(skb_in, + skb_network_offset(skb_in) + sizeof(struct ipv6hdr)))) + goto out; + + orig_ip = ipv6_hdr(skb_in)->saddr; + dir = CTINFO2DIR(ctinfo); + ipv6_hdr(skb_in)->saddr = ct->tuplehash[dir].tuple.src.u3.in6; + icmp6_send(skb_in, type, code, info, NULL, &parm); + ipv6_hdr(skb_in)->saddr = orig_ip; +out: + consume_skb(cloned_skb); +} +EXPORT_SYMBOL(icmpv6_ndo_send); +#endif |