[CRIU] [PATCH v2] net: Make criu do not fail on recent iproute2

[Pavel Emelyanov]

On 11/02/2016 12:15 PM, Kirill Tkhai wrote:
> Since iprule commit 67a990b81126 command "ip rule del" is not working anymore:
> 
>     iproute: disallow ip rule del without parameters
> 
>     Disallow run `ip rule del` without any parameter to avoid delete any first
>     rule from table.
> 
>     Signed-off-by: Andrey Jr. Melnikov <temnota.am at gmail.com>

Hm... Was it OK from Stephen Hemminger's perspective that the tool's API
had changed and had potentially broken ... some other userspace around it?

> So, criu restore fails with:
> 
>     Error (criu/net.c:1277): IP tool failed on rule delete
> 
> Fix that by explicit passing of rule's table.
> 
> v2: Use "ip rule flush" to main's and default's table rules at once.
> 
> Signed-off-by: Kirill Tkhai <ktkhai at virtuozzo.com>
> ---
>  criu/net.c |   23 +++++++++++------------
>  1 file changed, 11 insertions(+), 12 deletions(-)
> 
> diff --git a/criu/net.c b/criu/net.c
> index f563f00..123921d 100644
> --- a/criu/net.c
> +++ b/criu/net.c
> @@ -1259,22 +1259,22 @@ static int restore_links(int pid, NetnsEntry **netns)
>  	return ret;
>  }
>  
> -static int run_ip_tool(char *arg1, char *arg2, char *arg3, int fdin, int fdout, unsigned flags)
> +static int run_ip_tool(char *arg1, char *arg2, char *arg3, char *arg4, int fdin, int fdout, unsigned flags)
>  {
>  	char *ip_tool_cmd;
>  	int ret;
>  
> -	pr_debug("\tRunning ip %s %s\n", arg1, arg2);
> +	pr_debug("\tRunning ip %s %s %s %s\n", arg1, arg2, arg3 ? : "\0", arg4 ? : "\0");
>  
>  	ip_tool_cmd = getenv("CR_IP_TOOL");
>  	if (!ip_tool_cmd)
>  		ip_tool_cmd = "ip";
>  
>  	ret = cr_system(fdin, fdout, -1, ip_tool_cmd,
> -				(char *[]) { "ip", arg1, arg2, arg3, NULL }, flags);
> +				(char *[]) { "ip", arg1, arg2, arg3, arg4, NULL }, flags);
>  	if (ret) {
>  		if (!(flags & CRS_CAN_FAIL))
> -			pr_err("IP tool failed on %s %s\n", arg1, arg2);
> +			pr_err("IP tool failed on %s %s %s %s\n", arg1, arg2, arg3 ? : "\0", arg4 ? : "\0");
>  		return -1;
>  	}
>  
> @@ -1300,7 +1300,7 @@ static int run_iptables_tool(char *def_cmd, int fdin, int fdout)
>  static inline int dump_ifaddr(struct cr_imgset *fds)
>  {
>  	struct cr_img *img = img_from_set(fds, CR_FD_IFADDR);
> -	return run_ip_tool("addr", "save", NULL, -1, img_raw_fd(img), 0);
> +	return run_ip_tool("addr", "save", NULL, NULL, -1, img_raw_fd(img), 0);
>  }
>  
>  static inline int dump_route(struct cr_imgset *fds)
> @@ -1308,7 +1308,7 @@ static inline int dump_route(struct cr_imgset *fds)
>  	struct cr_img *img;
>  
>  	img = img_from_set(fds, CR_FD_ROUTE);
> -	if (run_ip_tool("route", "save", NULL, -1, img_raw_fd(img), 0))
> +	if (run_ip_tool("route", "save", NULL, NULL, -1, img_raw_fd(img), 0))
>  		return -1;
>  
>  	/* If ipv6 is disabled, "ip -6 route dump" dumps all routes */
> @@ -1316,7 +1316,7 @@ static inline int dump_route(struct cr_imgset *fds)
>  		return 0;
>  
>  	img = img_from_set(fds, CR_FD_ROUTE6);
> -	if (run_ip_tool("-6", "route", "save", -1, img_raw_fd(img), 0))
> +	if (run_ip_tool("-6", "route", "save", NULL, -1, img_raw_fd(img), 0))
>  		return -1;
>  
>  	return 0;
> @@ -1333,7 +1333,7 @@ static inline int dump_rule(struct cr_imgset *fds)
>  	if (!path)
>  		return -1;
>  
> -	if (run_ip_tool("rule", "save", NULL, -1, img_raw_fd(img), CRS_CAN_FAIL)) {
> +	if (run_ip_tool("rule", "save", NULL, NULL, -1, img_raw_fd(img), CRS_CAN_FAIL)) {
>  		pr_warn("Check if \"ip rule save\" is supported!\n");
>  		unlinkat(get_service_fd(IMG_FD_OFF), path, 0);
>  	}
> @@ -1465,7 +1465,7 @@ static int restore_ip_dump(int type, int pid, char *cmd)
>  		return 0;
>  	}
>  	if (img) {
> -		ret = run_ip_tool(cmd, "restore", NULL, img_raw_fd(img), -1, 0);
> +		ret = run_ip_tool(cmd, "restore", NULL, NULL, img_raw_fd(img), -1, 0);
>  		close_image(img);
>  	}
>  
> @@ -1506,9 +1506,8 @@ static inline int restore_rule(int pid)
>  	 * Delete 3 default rules to prevent duplicates. See kernel's
>  	 * function fib_default_rules_init() for the details.
>  	 */
> -	run_ip_tool("rule", "delete", NULL, -1, -1, 0);
> -	run_ip_tool("rule", "delete", NULL, -1, -1, 0);
> -	run_ip_tool("rule", "delete", NULL, -1, -1, 0);
> +	run_ip_tool("rule", "flush",  NULL,    NULL,    -1, -1, 0);
> +	run_ip_tool("rule", "delete", "table", "local", -1, -1, 0);
>  
>  	if (restore_ip_dump(CR_FD_RULE, pid, "rule"))
>  		ret = -1;
> 
> .
>