I ported my traffic analizator/sorter/viewer program to the openwrt. It is just a program, not an ipkg package,simply copy it to the /bin directory.
You can see the bridge traffic also with the -v switch...
  Location: http://www.phj.hu/wrt54gs/ipkg/pipacs
Program options:
  usage: pipacs options
    where options:
       [-c:sec]             Dump cycle in sec (10)
       [-f:file[-e:program]] Results into a file [and exec program](-)
       [-n:db]              Execute just db cycle (0)
       [-l:lineno]          Print lineno lines of hosts(25)
       [-k]                 Sort result by packet count (size)
       [-1]                 Ignore source IP (don't ignore)
       [-2]                 Ignore destination IP (don't ignore)
       [-h]                 Print just the header(use -a!)
       [-a]                 Print packet info&data (-)
       [-p]                 Print just summary info (-)
            Otherwise print sum&ip pairs
       [-t:[tcp|udp|icmp|....|number]] Filter on IP protocoll (ALL)
       [-g]                 Make GRE encapsulation trasparent (-)
       [-v]                 Skip VLAN headers (-)
       [-sa:IP[/Net]]       Filter on source address (-)/net
       [-sp:Port]           Filter on source port (-)
       [-da:IP[/Net]]       Filter on dest address/net (-)
       [-dp:Port]           Filter on dest port(-)
       [-xa:IP[/Net]]       Filter on src|dest address/net (-)
       [-xp:Port]           Filter on src|dest port (-)
       [-pa:pattern]        String match (0), last param!!!
       [-i:int[,int]]       Capture on this interface (eth0)
             Filtering rules:  t && (sa|da|xa) && (sp|dp|xp)
Ver. 2.5  (c):2000-2004, Pálóczi-Horváth János