Padding in pfloghdr

[Caglar Kilimci]

Hello list, I want to insert an extra field, u_int32_t, into pfloghdr struct but I am not sure how to change padding. 

160 Index: sys/net/if_pflog.h                                                      
161 ===================================================================            
162 --- sys/net/if_pflog.h  (revision 250171)                                      
163 +++ sys/net/if_pflog.h  (working copy)                                         
164 @@ -45,6 +45,8 @@                                                              
165         uid_t           rule_uid;                                              
166         pid_t           rule_pid;                                              
167         u_int8_t        dir;                                                   
168 +       //added for extra                                                       
169 +       u_int32_t       index;                                                 
170         u_int8_t        pad[3];                                                
171  }; 

If I increment hdrlen by 4 in tcpdump, everything seems fine but I guess this solution is not good.

  1 Index: print-pflog.c                                                           
  2 ===================================================================            
  3 --- print-pflog.c       (revision 250174)                                      
  4 +++ print-pflog.c       (working copy)                                         
  5 @@ -145,6 +145,7 @@                                                            
  6                                                                                
  7         /* skip to the real packet */                                          
  8         af = hdr->af;                                                          
  9 +       hdrlen+=4;                                                             
 10         length -= hdrlen;                                                      
 11         caplen -= hdrlen;                                                      
 12         p += hdrlen;

If I do not touch anything in tcpdump, it complains as "bad-len 0" error.

I mean, what is padding number for pfloghdr struct?
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