Re: [libnftnl PATCH v2] utils: Add helpers for interface name wildcards

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Hi,

On Wed, Jul 16, 2025 at 11:44:59AM +0200, Florian Westphal wrote:
> Phil Sutter <phil@xxxxxx> wrote:
> >  #include <string.h>
> >  #include <stdlib.h>
> > +#include <libmnl/libmnl.h>
> 
> Why is this include needed?

Because of:

| In file included from udata.c:9:
| ../include/utils.h:88:40: warning: 'struct nlattr' declared inside parameter list will not be visible outside of this definition or declaration
|    88 | const char *mnl_attr_get_ifname(struct nlattr *attr);
|       |                                        ^~~~~~

> >  #include <libnftnl/common.h>
> >  
> >  #include "config.h"
> > @@ -83,4 +84,7 @@ int nftnl_fprintf(FILE *fpconst, const void *obj, uint32_t cmd, uint32_t type,
> >  int nftnl_set_str_attr(const char **dptr, uint32_t *flags,
> >  		       uint16_t attr, const void *data, uint32_t data_len);
> >  
> > +void mnl_attr_put_ifname(struct nlmsghdr *nlh, int attr, const char *ifname);
> > +const char *mnl_attr_get_ifname(struct nlattr *attr);
> > +
> 
> nftnl_attr_put_ifname, nftnl_attr_get_ifname?
> Using mnl_ prefix seems wrong, that should be reserved for libmnl.

I chose the prefix since they 1:1 replace calls to mnl_attr_put_strz() and
mnl_attr_get_str(). You're right, since they are implemented by libnftnl the
prefix is wrong. I was a bit undecided whether to put them into libmnl, but
they are a bit too specific for that. Will fix the prefix and respin!

Thanks, Phil




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