make all filtering handles take const args.

(Logical change 1.77)
diff --git a/include/libnetlink.h b/include/libnetlink.h
index 3ff0dfc..3390d8b 100644
--- a/include/libnetlink.h
+++ b/include/libnetlink.h
@@ -19,29 +19,30 @@
 extern void rtnl_close(struct rtnl_handle *rth);
 extern int rtnl_wilddump_request(struct rtnl_handle *rth, int fam, int type);
 extern int rtnl_dump_request(struct rtnl_handle *rth, int type, void *req, int len);
-extern int rtnl_dump_filter(struct rtnl_handle *rth,
-			    int (*filter)(struct sockaddr_nl *, struct nlmsghdr *n, void *),
+
+typedef int (*rtnl_filter_t)(const struct sockaddr_nl *, const struct nlmsghdr *n, void *);
+extern int rtnl_dump_filter(struct rtnl_handle *rth, rtnl_filter_t filter,
 			    void *arg1,
-			    int (*junk)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
+			    rtnl_filter_t junk,
 			    void *arg2);
 extern int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
 		     unsigned groups, struct nlmsghdr *answer,
-		     int (*junk)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
+		     rtnl_filter_t junk,
 		     void *jarg);
-extern int rtnl_send(struct rtnl_handle *rth, char *buf, int);
+extern int rtnl_send(struct rtnl_handle *rth, const char *buf, int);
 
 
 extern int addattr32(struct nlmsghdr *n, int maxlen, int type, __u32 data);
-extern int addattr_l(struct nlmsghdr *n, int maxlen, int type, void *data, int alen);
+extern int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, int alen);
 extern int rta_addattr32(struct rtattr *rta, int maxlen, int type, __u32 data);
-extern int rta_addattr_l(struct rtattr *rta, int maxlen, int type, void *data, int alen);
+extern int rta_addattr_l(struct rtattr *rta, int maxlen, int type, const void *data, int alen);
 
 extern int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len);
 extern int parse_rtattr_byindex(struct rtattr *tb[], int max, struct rtattr *rta, int len);
 
-extern int rtnl_listen(struct rtnl_handle *, int (*handler)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
+extern int rtnl_listen(struct rtnl_handle *, rtnl_filter_t handler, 
 		       void *jarg);
-extern int rtnl_from_file(FILE *, int (*handler)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
+extern int rtnl_from_file(FILE *, rtnl_filter_t handler,
 		       void *jarg);
 
 #endif /* __LIBNETLINK_H__ */
diff --git a/include/ll_map.h b/include/ll_map.h
index 739f157..238a728 100644
--- a/include/ll_map.h
+++ b/include/ll_map.h
@@ -1,9 +1,10 @@
 #ifndef __LL_MAP_H__
 #define __LL_MAP_H__ 1
 
-extern int ll_remember_index(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg);
+extern int ll_remember_index(const struct sockaddr_nl *who, const struct nlmsghdr *n,
+			     void *arg);
 extern int ll_init_map(struct rtnl_handle *rth);
-extern int ll_name_to_index(char *name);
+extern int ll_name_to_index(const char *name);
 extern const char *ll_index_to_name(int idx);
 extern const char *ll_idx_n2a(int idx, char *buf);
 extern int ll_index_to_type(int idx);
diff --git a/ip/ip_common.h b/ip/ip_common.h
index 598c998..c359911 100644
--- a/ip/ip_common.h
+++ b/ip/ip_common.h
@@ -1,6 +1,11 @@
-extern int print_linkinfo(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg);
-extern int print_addrinfo(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg);
-extern int print_neigh(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg);
+extern int print_linkinfo(const struct sockaddr_nl *who, 
+			  const struct nlmsghdr *n, 
+			  void *arg);
+extern int print_addrinfo(const struct sockaddr_nl *who,
+			  const struct nlmsghdr *n, 
+			  void *arg);
+extern int print_neigh(const struct sockaddr_nl *who,
+		       const struct nlmsghdr *n, void *arg);
 extern int ipaddr_list(int argc, char **argv);
 extern int ipaddr_list_link(int argc, char **argv);
 extern int iproute_monitor(int argc, char **argv);
@@ -8,7 +13,8 @@
 extern void iproute_reset_filter(void);
 extern void ipaddr_reset_filter(int);
 extern void ipneigh_reset_filter(void);
-extern int print_route(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg);
+extern int print_route(const struct sockaddr_nl *who, 
+		       const struct nlmsghdr *n, void *arg);
 extern int do_ipaddr(int argc, char **argv);
 extern int do_iproute(int argc, char **argv);
 extern int do_iprule(int argc, char **argv);
diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 4bc63ad..01856c6 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -126,7 +126,7 @@
 		printf("qlen %d", ifr.ifr_qlen);
 }
 
-int print_linkinfo(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+int print_linkinfo(const struct sockaddr_nl *who, const struct nlmsghdr *n, void *arg)
 {
 	FILE *fp = (FILE*)arg;
 	struct ifinfomsg *ifi = NLMSG_DATA(n);
@@ -275,7 +275,8 @@
 	return 0;
 }
 
-int print_addrinfo(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+int print_addrinfo(const struct sockaddr_nl *who, const struct nlmsghdr *n, 
+		   void *arg)
 {
 	FILE *fp = (FILE*)arg;
 	struct ifaddrmsg *ifa = NLMSG_DATA(n);
@@ -465,7 +466,8 @@
 }
 
 
-int store_nlmsg(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+static int store_nlmsg(const struct sockaddr_nl *who, const struct nlmsghdr *n, 
+		       void *arg)
 {
 	struct nlmsg_list **linfo = (struct nlmsg_list**)arg;
 	struct nlmsg_list *h;
diff --git a/ip/ipmonitor.c b/ip/ipmonitor.c
index 9ed6bba..46373e7 100644
--- a/ip/ipmonitor.c
+++ b/ip/ipmonitor.c
@@ -33,7 +33,8 @@
 }
 
 
-int accept_msg(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+int accept_msg(const struct sockaddr_nl *who,
+	       const struct nlmsghdr *n, void *arg)
 {
 	FILE *fp = (FILE*)arg;
 
diff --git a/ip/ipneigh.c b/ip/ipneigh.c
index f8c2790..c3105ef 100644
--- a/ip/ipneigh.c
+++ b/ip/ipneigh.c
@@ -217,7 +217,7 @@
 }
 
 
-int print_neigh(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+int print_neigh(const struct sockaddr_nl *who, const struct nlmsghdr *n, void *arg)
 {
 	FILE *fp = (FILE*)arg;
 	struct ndmsg *r = NLMSG_DATA(n);
diff --git a/ip/iproute.c b/ip/iproute.c
index 48cd075..c91075c 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -103,7 +103,7 @@
 	return 0;
 }
 
-int print_route(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+int print_route(const struct sockaddr_nl *who, const struct nlmsghdr *n, void *arg)
 {
 	FILE *fp = (FILE*)arg;
 	struct rtmsg *r = NLMSG_DATA(n);
diff --git a/ip/iprule.c b/ip/iprule.c
index 0edba5b..a8bafc7 100644
--- a/ip/iprule.c
+++ b/ip/iprule.c
@@ -42,7 +42,8 @@
 	exit(-1);
 }
 
-int print_rule(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+static int print_rule(const struct sockaddr_nl *who, const struct nlmsghdr *n,
+		      void *arg)
 {
 	FILE *fp = (FILE*)arg;
 	struct rtmsg *r = NLMSG_DATA(n);
diff --git a/ip/rtmon.c b/ip/rtmon.c
index d01bc63..76ef8b9 100644
--- a/ip/rtmon.c
+++ b/ip/rtmon.c
@@ -46,7 +46,8 @@
 	fwrite((void*)n1, 1, NLMSG_ALIGN(n1->nlmsg_len), fp);
 }
 
-static int dump_msg(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+static int dump_msg(const struct sockaddr_nl *who, const struct nlmsghdr *n, 
+		    void *arg)
 {
 	FILE *fp = (FILE*)arg;
 	if (!init_phase)
diff --git a/ip/xfrm_policy.c b/ip/xfrm_policy.c
index 07167da..5c7059e 100644
--- a/ip/xfrm_policy.c
+++ b/ip/xfrm_policy.c
@@ -334,7 +334,8 @@
 	return 1;
 }
 
-int xfrm_policy_print(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+static int xfrm_policy_print(const struct sockaddr_nl *who, 
+			     const struct nlmsghdr *n, void *arg)
 {
 	FILE *fp = (FILE*)arg;
 	struct xfrm_userpolicy_info *xpinfo = NLMSG_DATA(n);
@@ -518,7 +519,9 @@
  * With an existing policy of nlmsg, make new nlmsg for deleting the policy
  * and store it to buffer.
  */
-int xfrm_policy_keep(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+static int xfrm_policy_keep(const struct sockaddr_nl *who,
+			    const struct nlmsghdr *n,
+			    void *arg)
 {
 	struct xfrm_buffer *xb = (struct xfrm_buffer *)arg;
 	struct rtnl_handle *rth = xb->rth;
diff --git a/ip/xfrm_state.c b/ip/xfrm_state.c
index 6aa991f..d6d2143 100644
--- a/ip/xfrm_state.c
+++ b/ip/xfrm_state.c
@@ -371,7 +371,9 @@
 	return (memcmp(&s0, s, sizeof(s0)) == 0);
 }
 
-int xfrm_state_print(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+static int xfrm_state_print(const struct sockaddr_nl *who,
+			    const struct nlmsghdr *n,
+			    void *arg)
 {
 	FILE *fp = (FILE*)arg;
 	struct xfrm_usersa_info *xsinfo = NLMSG_DATA(n);
@@ -511,7 +513,9 @@
  * With an existing state of nlmsg, make new nlmsg for deleting the state
  * and store it to buffer.
  */
-int xfrm_state_keep(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+static int xfrm_state_keep(const struct sockaddr_nl *who,
+			   const struct nlmsghdr *n,
+			   void *arg)
 {
 	struct xfrm_buffer *xb = (struct xfrm_buffer *)arg;
 	struct rtnl_handle *rth = xb->rth;
diff --git a/lib/libnetlink.c b/lib/libnetlink.c
index 76fedee..45f293d 100644
--- a/lib/libnetlink.c
+++ b/lib/libnetlink.c
@@ -105,7 +105,7 @@
 	return sendto(rth->fd, (void*)&req, sizeof(req), 0, (struct sockaddr*)&nladdr, sizeof(nladdr));
 }
 
-int rtnl_send(struct rtnl_handle *rth, char *buf, int len)
+int rtnl_send(struct rtnl_handle *rth, const char *buf, int len)
 {
 	struct sockaddr_nl nladdr;
 
@@ -140,9 +140,9 @@
 }
 
 int rtnl_dump_filter(struct rtnl_handle *rth,
-		     int (*filter)(struct sockaddr_nl *, struct nlmsghdr *n, void *),
+		     rtnl_filter_t filter,
 		     void *arg1,
-		     int (*junk)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
+		     rtnl_filter_t junk,
 		     void *arg2)
 {
 	char	buf[16384];
@@ -224,7 +224,7 @@
 
 int rtnl_talk(struct rtnl_handle *rtnl, struct nlmsghdr *n, pid_t peer,
 	      unsigned groups, struct nlmsghdr *answer,
-	      int (*junk)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
+	      rtnl_filter_t junk,
 	      void *jarg)
 {
 	int status;
@@ -341,8 +341,8 @@
 }
 
 int rtnl_listen(struct rtnl_handle *rtnl, 
-	      int (*handler)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
-	      void *jarg)
+		rtnl_filter_t handler,
+		void *jarg)
 {
 	int status;
 	struct nlmsghdr *h;
@@ -414,9 +414,8 @@
 	}
 }
 
-int rtnl_from_file(FILE *rtnl, 
-	      int (*handler)(struct sockaddr_nl *,struct nlmsghdr *n, void *),
-	      void *jarg)
+int rtnl_from_file(FILE *rtnl, rtnl_filter_t handler,
+		   void *jarg)
 {
 	int status;
 	struct sockaddr_nl nladdr;
@@ -486,7 +485,8 @@
 	return 0;
 }
 
-int addattr_l(struct nlmsghdr *n, int maxlen, int type, void *data, int alen)
+int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data, 
+	      int alen)
 {
 	int len = RTA_LENGTH(alen);
 	struct rtattr *rta;
@@ -520,7 +520,8 @@
 	return 0;
 }
 
-int rta_addattr_l(struct rtattr *rta, int maxlen, int type, void *data, int alen)
+int rta_addattr_l(struct rtattr *rta, int maxlen, int type, 
+		  const void *data, int alen)
 {
 	struct rtattr *subrta;
 	int len = RTA_LENGTH(alen);
@@ -537,7 +538,6 @@
 	return 0;
 }
 
-
 int parse_rtattr(struct rtattr *tb[], int max, struct rtattr *rta, int len)
 {
 	while (RTA_OK(rta, len)) {
diff --git a/lib/ll_map.c b/lib/ll_map.c
index e5a95e6..e5798d3 100644
--- a/lib/ll_map.c
+++ b/lib/ll_map.c
@@ -35,7 +35,7 @@
 
 static struct idxmap *idxmap[16];
 
-int ll_remember_index(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+int ll_remember_index(const struct sockaddr_nl *who, const struct nlmsghdr *n, void *arg)
 {
 	int h;
 	struct ifinfomsg *ifi = NLMSG_DATA(n);
@@ -131,7 +131,7 @@
 	return 0;
 }
 
-int ll_name_to_index(char *name)
+int ll_name_to_index(const char *name)
 {
 	static char ncache[16];
 	static int icache;
diff --git a/misc/ifstat.c b/misc/ifstat.c
index b4a6d1d..54afce4 100644
--- a/misc/ifstat.c
+++ b/misc/ifstat.c
@@ -77,7 +77,7 @@
 	return 0;
 }
 
-int get_nlmsg(struct sockaddr_nl *who, struct nlmsghdr *m, void *arg)
+int get_nlmsg(const struct sockaddr_nl *who, const struct nlmsghdr *m, void *arg)
 {
 	struct ifinfomsg *ifi = NLMSG_DATA(m);
 	struct rtattr * tb[IFLA_MAX+1];
diff --git a/tc/tc_class.c b/tc/tc_class.c
index 154c2d1..d3d8bbc 100644
--- a/tc/tc_class.c
+++ b/tc/tc_class.c
@@ -176,7 +176,8 @@
 int filter_ifindex;
 __u32 filter_qdisc;
 
-int print_class(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+static int print_class(const struct sockaddr_nl *who, 
+		       const struct nlmsghdr *n, void *arg)
 {
 	FILE *fp = (FILE*)arg;
 	struct tcmsg *t = NLMSG_DATA(n);
@@ -250,7 +251,7 @@
 				fprintf(fp, "\n");
 			}
 		}
-		if (q && tb[TCA_XSTATS]) {
+		if (q && tb[TCA_XSTATS] && q->print_xstats) {
 			q->print_xstats(q, fp, tb[TCA_XSTATS]);
 			fprintf(fp, "\n");
 		}
diff --git a/tc/tc_util.c b/tc/tc_util.c
index 5545478..5cc9e38 100644
--- a/tc/tc_util.c
+++ b/tc/tc_util.c
@@ -418,7 +418,7 @@
 	return 0;
 }
 
-void print_tm(FILE * f, struct tcf_t *tm)
+void print_tm(FILE * f, const struct tcf_t *tm)
 {
 	int hz = get_hz();
 	if (tm->install != 0)
diff --git a/tc/tc_util.h b/tc/tc_util.h
index 3a25760..62a6c8c 100644
--- a/tc/tc_util.h
+++ b/tc/tc_util.h
@@ -9,7 +9,7 @@
 struct qdisc_util
 {
 	struct  qdisc_util *next;
-	char	id[16];
+	const char *id;
 	int	(*parse_qopt)(struct qdisc_util *qu, int argc, char **argv, struct nlmsghdr *n);
 	int	(*print_qopt)(struct qdisc_util *qu, FILE *f, struct rtattr *opt);
 	int 	(*print_xstats)(struct qdisc_util *qu, FILE *f, struct rtattr *xstats);
@@ -58,7 +58,7 @@
 extern char * sprint_usecs(__u32 usecs, char *buf);
 extern char * sprint_percent(__u32 percent, char *buf);
 
-extern void print_tcstats(FILE *fp, struct tc_stats *st);
+extern void print_tcstats_attr(FILE *fp, const struct rtattr *ts);
 
 extern int get_tc_classid(__u32 *h, const char *str);
 extern int print_tc_classid(char *buf, int len, __u32 h);
@@ -70,11 +70,13 @@
 extern char *action_n2a(int action, char *buf, int len);
 extern int  action_a2n(char *arg, int *result);
 extern int  act_parse_police(struct action_util *a,int *, char ***, int, struct nlmsghdr *);
-extern int  print_police(struct action_util *a,FILE *f, struct rtattr *tb);
-extern int  police_print_xstats(struct action_util *a,FILE *f, struct rtattr *tb);
-extern int  tc_print_action(FILE *f, struct rtattr *tb);
-extern int  tc_print_ipt(FILE *f, struct rtattr *tb);
+extern int  print_police(struct action_util *a, FILE *f, 
+			 struct rtattr *tb);
+extern int  police_print_xstats(struct action_util *a,FILE *f, 
+				struct rtattr *tb);
+extern int  tc_print_action(FILE *f, const struct rtattr *tb);
+extern int  tc_print_ipt(FILE *f, const struct rtattr *tb);
 extern int  parse_action(int *, char ***, int, struct nlmsghdr *);
-extern void print_tm(FILE *f, struct tcf_t *tm);
+extern void print_tm(FILE *f, const struct tcf_t *tm);
 
 #endif