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Date:	Wed, 12 Sep 2007 16:55:27 +0400
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	netdev@...r.kernel.org, Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH 1/4] [IPROUTE2] Revert "Make ip utility veth driver aware"

Eric W. Biederman wrote:
> Stephen it looks like you weren't cc'd on the latest version
> of the veth support.  So this patchset first reverts the old

He was. The latest version looks completely different from what
is reversed in this patch.

> version of the veth support you merged.  Then merges a tested
> version of the veth support.
> 
> This reverts commit 4ed390ce43d1ec7c881721f312260df901d8390d.
> 
> Conflicts:
> 
> 	ip/ip.c
> ---
>  ip/Makefile |    2 +-
>  ip/ip.c     |    4 +-
>  ip/veth.c   |  196 -----------------------------------------------------------
>  ip/veth.h   |   17 -----
>  4 files changed, 2 insertions(+), 217 deletions(-)
>  delete mode 100644 ip/veth.c
>  delete mode 100644 ip/veth.h
> 
> diff --git a/ip/Makefile b/ip/Makefile
> index 209c5c8..9a5bfe3 100644
> --- a/ip/Makefile
> +++ b/ip/Makefile
> @@ -1,7 +1,7 @@
>  IPOBJ=ip.o ipaddress.o iproute.o iprule.o \
>      rtm_map.o iptunnel.o ip6tunnel.o tunnel.o ipneigh.o ipntable.o iplink.o \
>      ipmaddr.o ipmonitor.o ipmroute.o ipprefix.o \
> -    ipxfrm.o xfrm_state.o xfrm_policy.o xfrm_monitor.o veth.o
> +    ipxfrm.o xfrm_state.o xfrm_policy.o xfrm_monitor.o
>  
>  RTMONOBJ=rtmon.o
>  
> diff --git a/ip/ip.c b/ip/ip.c
> index 829fc64..4bdb83b 100644
> --- a/ip/ip.c
> +++ b/ip/ip.c
> @@ -27,7 +27,6 @@
>  #include "SNAPSHOT.h"
>  #include "utils.h"
>  #include "ip_common.h"
> -#include "veth.h"
>  
>  int preferred_family = AF_UNSPEC;
>  int show_stats = 0;
> @@ -48,7 +47,7 @@ static void usage(void)
>  "Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }\n"
>  "       ip [ -force ] [-batch filename\n"
>  "where  OBJECT := { link | addr | route | rule | neigh | ntable | tunnel |\n"
> -"                   maddr | mroute | monitor | xfrm | veth }\n"
> +"                   maddr | mroute | monitor | xfrm }\n"
>  "       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
>  "                    -f[amily] { inet | inet6 | ipx | dnet | link } |\n"
>  "                    -o[neline] | -t[imestamp] }\n");
> @@ -78,7 +77,6 @@ static const struct cmd {
>  	{ "monitor",	do_ipmonitor },
>  	{ "xfrm",	do_xfrm },
>  	{ "mroute",	do_multiroute },
> -	{ "veth",	do_veth },
>  	{ "help",	do_help },
>  	{ 0 }
>  };
> diff --git a/ip/veth.c b/ip/veth.c
> deleted file mode 100644
> index d4eecc8..0000000
> --- a/ip/veth.c
> +++ /dev/null
> @@ -1,196 +0,0 @@
> -/*
> - * veth.c	       "ethernet tunnel"
> - *
> - *		This program is free software; you can redistribute it and/or
> - *		modify it under the terms of the GNU General Public License
> - *		as published by the Free Software Foundation; either version
> - *		2 of the License, or (at your option) any later version.
> - *
> - * Authors:	Pavel Emelianov, <xemul@...nvz.org>
> - *
> - */
> -
> -#include <stdio.h>
> -#include <string.h>
> -#include <unistd.h>
> -#include <sys/types.h>
> -#include <sys/socket.h>
> -#include <linux/genetlink.h>
> -
> -#include "utils.h"
> -#include "veth.h"
> -
> -#define GENLMSG_DATA(glh)       ((void *)(NLMSG_DATA(glh) + GENL_HDRLEN))
> -#define NLA_DATA(na)            ((void *)((char*)(na) + NLA_HDRLEN))
> -
> -static int do_veth_help(void)
> -{
> -	fprintf(stderr, "Usage: ip veth add DEVICE PEER_NAME\n");
> -	fprintf(stderr, "               del DEVICE\n");
> -	exit(-1);
> -}
> -
> -static int genl_ctrl_resolve_family(const char *family)
> -{
> -	struct rtnl_handle rth;
> -	struct nlmsghdr *nlh;
> -	struct genlmsghdr *ghdr;
> -	int ret = 0;
> -	struct {
> -		struct nlmsghdr         n;
> -		char                    buf[4096];
> -	} req;
> -
> -	memset(&req, 0, sizeof(req));
> -
> -	nlh = &req.n;
> -	nlh->nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
> -	nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
> -	nlh->nlmsg_type = GENL_ID_CTRL;
> -
> -	ghdr = NLMSG_DATA(&req.n);
> -	ghdr->cmd = CTRL_CMD_GETFAMILY;
> -
> -	if (rtnl_open_byproto(&rth, 0, NETLINK_GENERIC) < 0) {
> -		fprintf(stderr, "Cannot open generic netlink socket\n");
> -		exit(1);
> -	}
> -
> -	addattr_l(nlh, 128, CTRL_ATTR_FAMILY_NAME, family, strlen(family) + 1);
> -
> -	if (rtnl_talk(&rth, nlh, 0, 0, nlh, NULL, NULL) < 0) {
> -		fprintf(stderr, "Error talking to the kernel\n");
> -		goto errout;
> -	}
> -
> -	{
> -		struct rtattr *tb[CTRL_ATTR_MAX + 1];
> -		struct genlmsghdr *ghdr = NLMSG_DATA(nlh);
> -		int len = nlh->nlmsg_len;
> -		struct rtattr *attrs;
> -
> -		if (nlh->nlmsg_type !=  GENL_ID_CTRL) {
> -			fprintf(stderr, "Not a controller message, nlmsg_len=%d "
> -				"nlmsg_type=0x%x\n", nlh->nlmsg_len, nlh->nlmsg_type);
> -			goto errout;
> -		}
> -
> -		if (ghdr->cmd != CTRL_CMD_NEWFAMILY) {
> -			fprintf(stderr, "Unkown controller command %d\n", ghdr->cmd);
> -			goto errout;
> -		}
> -
> -		len -= NLMSG_LENGTH(GENL_HDRLEN);
> -
> -		if (len < 0) {
> -			fprintf(stderr, "wrong controller message len %d\n", len);
> -			return -1;
> -		}
> -
> -		attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN);
> -		parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len);
> -
> -		if (tb[CTRL_ATTR_FAMILY_ID] == NULL) {
> -			fprintf(stderr, "Missing family id TLV\n");
> -			goto errout;
> -		}
> -
> -		ret = *(__u16 *) RTA_DATA(tb[CTRL_ATTR_FAMILY_ID]);
> -	}
> -
> -errout:
> -	rtnl_close(&rth);
> -	return ret;
> -}
> -
> -static int do_veth_operate(char *dev, char *peer, int cmd)
> -{
> -	struct rtnl_handle rth;
> -	struct nlmsghdr *nlh;
> -	struct genlmsghdr *ghdr;
> -	struct nlattr *attr;
> -	struct  {
> -		struct nlmsghdr n;
> -		struct genlmsghdr h;
> -		char bug[1024];
> -	} req;
> -	int family, len;
> -	int err = 0;
> -
> -	family = genl_ctrl_resolve_family("veth");
> -	if (family == 0) {
> -		fprintf(stderr, "veth: Can't resolve family\n");
> -		exit(1);
> -	}
> -
> -	if (rtnl_open_byproto(&rth, 0, NETLINK_GENERIC) < 0)
> -		exit(1);
> -
> -	nlh = &req.n;
> -	nlh->nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN);
> -	nlh->nlmsg_flags = NLM_F_REQUEST;
> -	nlh->nlmsg_type = family;
> -	nlh->nlmsg_seq = 0;
> -
> -	ghdr = &req.h;
> -	ghdr->cmd = cmd;
> -
> -	attr = (struct nlattr *) GENLMSG_DATA(&req);
> -	len = strlen(dev);
> -	attr->nla_type = VETH_ATTR_DEVNAME;
> -	attr->nla_len = len + 1 + NLA_HDRLEN;
> -	memcpy(NLA_DATA(attr), dev, len);
> -	nlh->nlmsg_len += NLMSG_ALIGN(attr->nla_len);
> -
> -	if (peer) {
> -		attr = (struct nlattr *)((char *)attr +
> -				NLMSG_ALIGN(attr->nla_len));
> -		len = strlen(peer);
> -		attr->nla_type = VETH_ATTR_PEERNAME;
> -		attr->nla_len = len + 1 + NLA_HDRLEN;
> -		memcpy(NLA_DATA(attr), peer, len);
> -		nlh->nlmsg_len += NLMSG_ALIGN(attr->nla_len);
> -	}
> -
> -	if (rtnl_send(&rth, (char *) &req, nlh->nlmsg_len) < 0) {
> -		err = -1;
> -		fprintf(stderr, "Error talking to the kernel (add)\n");
> -	}
> -
> -	rtnl_close(&rth);
> -	return err;
> -}
> -
> -static int do_veth_add(int argc, char **argv)
> -{
> -	if (argc < 2)
> -		return do_veth_help();
> -
> -	return do_veth_operate(argv[0], argv[1], VETH_CMD_ADD);
> -}
> -
> -static int do_veth_del(int argc, char **argv)
> -{
> -	char *name;
> -
> -	if (argc < 1)
> -		return do_veth_help();
> -
> -	return do_veth_operate(argv[0], NULL, VETH_CMD_DEL);
> -}
> -
> -int do_veth(int argc, char **argv)
> -{
> -	if (argc == 0)
> -		return do_veth_help();
> -
> -	if (strcmp(*argv, "add") == 0 || strcmp(*argv, "a") == 0)
> -		return do_veth_add(argc - 1, argv + 1);
> -	if (strcmp(*argv, "del") == 0 || strcmp(*argv, "d") == 0)
> -		return do_veth_del(argc - 1, argv + 1);
> -	if (strcmp(*argv, "help") == 0)
> -		return do_veth_help();
> -
> -	fprintf(stderr, "Command \"%s\" is unknown, try \"ip veth help\".\n", *argv);
> -	exit(-1);
> -}
> diff --git a/ip/veth.h b/ip/veth.h
> deleted file mode 100644
> index 4d7b357..0000000
> --- a/ip/veth.h
> +++ /dev/null
> @@ -1,17 +0,0 @@
> -int do_veth(int argc, char **argv);
> -
> -enum {
> -	VETH_CMD_UNSPEC, 
> -	VETH_CMD_ADD, 
> -	VETH_CMD_DEL,
> -
> -	VETH_CMD_MAX
> -};
> -
> -enum {
> -	VETH_ATTR_UNSPEC,
> -	VETH_ATTR_DEVNAME,
> -	VETH_ATTR_PEERNAME,
> -
> -	VETH_ATTR_MAX
> -};

-
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