[PATCH v3 RFC] Smack: Inform peer that IPv6 traffic has been blocked

[Casey Schaufler]

On 7/19/2018 2:47 AM, Piotr Sawicki wrote:
> In this patch we're sending an ICMPv6 message to a peer to
> immediately inform it that making a connection is not possible.
> In case of TCP connections, without this change, the peer
> will be waiting until a connection timeout is exceeded.
>
> Signed-off-by: Piotr Sawicki <p.sawicki2 at partner.samsung.com>

Acked-by: Casey Schaufler <casey at schaufler-ca.com>

> ---
> Changes in v2:
>  - Add missing Signed-off-by field
> Changes in v3:
>  - Fix formatting issues caused by improper email client configuration
> ---
>  security/smack/smack_lsm.c | 4 ++++
>  1 file changed, 4 insertions(+)
>
> diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
> index c2282ac..efa81bc 100644
> --- a/security/smack/smack_lsm.c
> +++ b/security/smack/smack_lsm.c
> @@ -28,6 +28,7 @@
>  #include <linux/tcp.h>
>  #include <linux/udp.h>
>  #include <linux/dccp.h>
> +#include <linux/icmpv6.h>
>  #include <linux/slab.h>
>  #include <linux/mutex.h>
>  #include <linux/pipe_fs_i.h>
> @@ -4010,6 +4011,9 @@ static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
>  #ifdef SMACK_IPV6_PORT_LABELING
>  		rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
>  #endif /* SMACK_IPV6_PORT_LABELING */
> +		if (rc != 0)
> +			icmpv6_send(skb, ICMPV6_DEST_UNREACH,
> +					ICMPV6_ADM_PROHIBITED, 0);
>  		break;
>  #endif /* CONFIG_IPV6 */
>  	}

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