netdev - Re: [PATCH V2 net-next] LISP: Locator/Identifier Separation Protocol

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Date:	Tue, 17 Jun 2014 13:41:04 -0700
From:	Christopher White <chris@...icalelegance.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	Linux Netdev List <netdev@...r.kernel.org>,
	"Vina Ermagan (vermagan)" <vermagan@...co.com>,
	"Lorand Jakab -X (lojakab - M SQUARED CONSULTING INC. at Cisco)" 
	<lojakab@...co.com>
Subject: Re: [PATCH V2 net-next] LISP: Locator/Identifier Separation Protocol

Thanks Tom, some quick questions as I wrap this up….

On Jun 5, 2014, at 3:12 PM, Tom Herbert <therbert@...gle.com> wrote:

> 
>> +static inline struct rtable *find_route(struct net *net,
>> +                                       __be32 *saddr, __be32 daddr,
>> +                                       u8 ipproto, u8 tos, u32 skb_mark)
>> +{
>> +       struct rtable *rt;
>> +
>> +       /* Tunnel configuration keeps DSCP part of TOS bits, But Linux
>> +        * router expect RT_TOS bits only.
>> +        */
>> +       struct flowi4 fl = { .daddr             = daddr,
>> +                            .saddr             = *saddr,
>> +                            .flowi4_tos        = RT_TOS(tos),
>> +                            .flowi4_mark       = skb_mark,
>> +                            .flowi4_proto      = ipproto };
>> +
>> +       rt = ip_route_output_key(net, &fl);
>> +       *saddr = fl.saddr;
>> +       return rt;
>> +}
>> +
> Looks like a function that should be in common header file?
> 

I’m not certain where the right place would be for this. A new file perhaps?

> 
>> +static int create_v4_sock(struct net *net, __be16 port, struct socket **psock,
>> +                         u32 flags)
>> +{
>> +       struct sock *sk;
>> +       struct socket *sock;
>> +       struct sockaddr_in lisp_addr = {
>> +               .sin_family             = AF_INET,
>> +               .sin_addr.s_addr        = htonl(INADDR_ANY),
>> +               .sin_port               = port,
>> +       };
>> +       int rc;
>> +
>> +       /* Create UDP socket for encapsulation receive. */
>> +       rc = sock_create_kern(AF_INET, SOCK_DGRAM, IPPROTO_UDP, &sock);
>> +       if (rc < 0) {
>> +               pr_debug("UDP socket create failed\n");
>> +               return rc;
>> +       }
>> +
>> +       /* Put in proper namespace */
>> +       sk = sock->sk;
>> +       sk_change_net(sk, net);
>> +
>> +       rc = kernel_bind(sock, (struct sockaddr *)&lisp_addr,
>> +                        sizeof(lisp_addr));
>> +       if (rc < 0) {
>> +               pr_debug("bind for UDP socket %pI4:%u (%d)\n",
>> +                        &lisp_addr.sin_addr, ntohs(lisp_addr.sin_port), rc);
>> +               sk_release_kernel(sk);
>> +               return rc;
>> +       }
>> +
>> +       *psock = sock;
>> +       /* Disable multicast loopback */
>> +       inet_sk(sk)->mc_loop = 0;
>> +
>> +       if (!(flags & LISP_F_UDP_CSUM))
>> +               sock->sk->sk_no_check_tx = 1;
>> +       return 0;
>> +}
> Another function that is common among UDP tunneling protocols and
> should be in common code.

In udp.c perhaps? udp_tunnel_create_v4_sock()?

Thanks!
-Chris

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