Hi Dan, On 10/02/10 9:55 -0800, Dan Smith wrote: > Guilt dropped the new checkpoint_dev.c file when I switched to the > newer branch. Sorry about that. Updated patch included below. >
[...]
> diff --git a/net/checkpoint_dev.c b/net/checkpoint_dev.c
> new file mode 100644
> index 0000000..0dddd15
> --- /dev/null
> +++ b/net/checkpoint_dev.c
[...]
> +
> +static struct nlmsghdr *rtnl_get_response(struct socket *rtnl,
> + struct sk_buff **skb)
> +{
> + int ret;
> + long timeo = MAX_SCHEDULE_TIMEOUT;
> + struct nlmsghdr *nlh;
> +
> + ret = sk_wait_data(rtnl->sk, &timeo);
> + if (!ret)
> + return ERR_PTR(-EPIPE);
> +
> + *skb = skb_dequeue(&rtnl->sk->sk_receive_queue);
> + if (!*skb)
> + return ERR_PTR(-EPIPE);
> +
> + ret = -EINVAL;
> + nlh = nlmsg_hdr(*skb);
> + if (!nlh)
> + goto err;
> +
> + if (nlh->nlmsg_type == NLMSG_ERROR) {
> + struct nlmsgerr *errmsg = nlmsg_data(nlh);
> + ret = errmsg->error;
> + goto err;
> + }
> +
> + return nlh;
> + err:
> + kfree_skb(*skb);
> + *skb = NULL;
> +
> + return ERR_PTR(ret);
> +}
> +
[...]
> +
> +static struct sk_buff *new_link_message(char *this_name, char *peer_name)
> +{
> + int ret = -ENOMEM;
> + int flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK;
> + struct nlmsghdr *nlh;
> + struct sk_buff *skb;
> + struct ifinfomsg *ifm;
> + struct nlattr *linkinfo;
> +
> + skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
> + if (!skb)
> + goto out;
> +
> + nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*ifm), flags);
> + if (!nlh)
> + goto out;
> +
> + ifm = nlmsg_data(nlh);
> + memset(ifm, 0, sizeof(*ifm));
> +
> + ret = nla_put_string(skb, IFLA_IFNAME, this_name);
> + if (ret)
> + goto out;
> +
> + ret = -ENOMEM;
> +
> + linkinfo = nla_nest_start(skb, IFLA_LINKINFO);
> + if (!linkinfo)
> + goto out;
> +
> + if (nla_put_string(skb, IFLA_INFO_KIND, "veth") < 0)
> + goto out;
> +
> + ret = veth_peer_data(skb, peer_name);
> + if (ret < 0)
> + goto out;
> +
> + nla_nest_end(skb, linkinfo);
> + nlmsg_end(skb, nlh);
> +
> + out:
> + if (ret < 0) {
> + kfree(skb);
I'm definitely not a network expert, but this kfree(skb) should probably be
replaced by kfree_skb(skb).
> + skb = ERR_PTR(ret);
> + }
> +
> + return skb;
> +}
> +
> +static struct net_device *new_veth_pair(char *this_name, char *peer_name)
> +{
> + int ret = -ENOMEM;
> + struct socket *rtnl;
> + struct sk_buff *skb = NULL;
> + struct nlmsghdr *nlh;
> + struct msghdr msg;
> + struct kvec kvec;
> +
> + skb = new_link_message(this_name, peer_name);
> + if (IS_ERR(skb)) {
> + ret = PTR_ERR(skb);
> + ckpt_debug("failed to create new link message: %i\n", ret);
> + skb = NULL;
> + goto out;
> + }
> +
> + memset(&msg, 0, sizeof(msg));
> + kvec.iov_len = skb->len;
> + kvec.iov_base = skb->head;
> +
> + rtnl = rtnl_open();
> + if (IS_ERR(rtnl)) {
> + ret = PTR_ERR(rtnl);
> + ckpt_debug("Unable to open rtnetlink socket: %i\n", ret);
> + goto out_noclose;
> + }
> +
> + ret = kernel_sendmsg(rtnl, &msg, &kvec, 1, kvec.iov_len);
> + if (ret < 0)
> + goto out;
> + else if (ret != skb->len) {
> + ret = -EIO;
> + goto out;
> + }
> +
> + /* Free the send skb to make room for the receive skb */
> + kfree(skb);
Ditto.
> +
> + nlh = rtnl_get_response(rtnl, &skb);
> + if (IS_ERR(nlh)) {
> + ret = PTR_ERR(nlh);
> + ckpt_debug("RTNETLINK said: %i\n", ret);
> + }
> + out:
> + rtnl_close(rtnl);
> + out_noclose:
> + kfree(skb);
Ditto.
Thanks,
Louis
[...]
--
Dr Louis Rilling Kerlabs
Skype: louis.rilling Batiment Germanium
Phone: (+33|0) 6 80 89 08 23 80 avenue des Buttes de Coesmes
http://www.kerlabs.com/ 35700 Rennes
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