From de157fe2a76024ce513d646ca76a661d4b0588b2 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= <zbyszek@in.waw.pl>
Date: Thu, 24 Oct 2019 11:40:44 +0200
Subject: [PATCH] sd-netlink: constify object pointers passed to getters

sd-netlink is not public yet, so we can change the interface.

I did not touch interfaces of functions like sd_netlink_wait() and
sd_rtnl_message_new_link() which do not modify the object that is passed in,
because in the future we might want to change the code to e.g. take a
reference to the parent object or otherwise require a non-const reference.
---
 src/libsystemd/sd-netlink/generic-netlink.c |  4 +-
 src/libsystemd/sd-netlink/generic-netlink.h |  2 +-
 src/libsystemd/sd-netlink/netlink-message.c |  8 +--
 src/libsystemd/sd-netlink/netlink-slot.c    |  6 +--
 src/libsystemd/sd-netlink/rtnl-message.c    | 60 +++++++++++-----------
 src/libsystemd/sd-netlink/sd-netlink.c      |  6 +--
 src/systemd/sd-netlink.h                    | 80 ++++++++++++++---------------
 7 files changed, 83 insertions(+), 83 deletions(-)

diff --git a/src/libsystemd/sd-netlink/generic-netlink.c b/src/libsystemd/sd-netlink/generic-netlink.c
index ad35b14..2576f48 100644
--- a/src/libsystemd/sd-netlink/generic-netlink.c
+++ b/src/libsystemd/sd-netlink/generic-netlink.c
@@ -136,7 +136,7 @@ static int lookup_id(sd_netlink *nl, sd_genl_family family, uint16_t *id) {
         return 0;
 }
 
-int nlmsg_type_to_genl_family(sd_netlink *nl, uint16_t type, sd_genl_family *ret) {
+int nlmsg_type_to_genl_family(const sd_netlink *nl, uint16_t type, sd_genl_family *ret) {
         void *p;
 
         assert_return(nl, -EINVAL);
@@ -160,7 +160,7 @@ int nlmsg_type_to_genl_family(sd_netlink *nl, uint16_t type, sd_genl_family *ret
         return 0;
 }
 
-int sd_genl_message_get_family(sd_netlink *nl, sd_netlink_message *m, sd_genl_family *family) {
+int sd_genl_message_get_family(const sd_netlink *nl, const sd_netlink_message *m, sd_genl_family *family) {
         uint16_t type;
         int r;
 
diff --git a/src/libsystemd/sd-netlink/generic-netlink.h b/src/libsystemd/sd-netlink/generic-netlink.h
index 82afe4e..e9ae559 100644
--- a/src/libsystemd/sd-netlink/generic-netlink.h
+++ b/src/libsystemd/sd-netlink/generic-netlink.h
@@ -3,4 +3,4 @@
 
 #include "sd-netlink.h"
 
-int nlmsg_type_to_genl_family(sd_netlink *nl, uint16_t type, sd_genl_family *ret);
+int nlmsg_type_to_genl_family(const sd_netlink *nl, uint16_t type, sd_genl_family *ret);
diff --git a/src/libsystemd/sd-netlink/netlink-message.c b/src/libsystemd/sd-netlink/netlink-message.c
index bfbfcb2..f499a4c 100644
--- a/src/libsystemd/sd-netlink/netlink-message.c
+++ b/src/libsystemd/sd-netlink/netlink-message.c
@@ -114,7 +114,7 @@ sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) {
         return NULL;
 }
 
-int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) {
+int sd_netlink_message_get_type(const sd_netlink_message *m, uint16_t *type) {
         assert_return(m, -EINVAL);
         assert_return(type, -EINVAL);
 
@@ -132,7 +132,7 @@ int sd_netlink_message_set_flags(sd_netlink_message *m, uint16_t flags) {
         return 0;
 }
 
-int sd_netlink_message_is_broadcast(sd_netlink_message *m) {
+int sd_netlink_message_is_broadcast(const sd_netlink_message *m) {
         assert_return(m, -EINVAL);
 
         return m->broadcast;
@@ -1001,14 +1001,14 @@ uint32_t rtnl_message_get_serial(sd_netlink_message *m) {
         return m->hdr->nlmsg_seq;
 }
 
-int sd_netlink_message_is_error(sd_netlink_message *m) {
+int sd_netlink_message_is_error(const sd_netlink_message *m) {
         assert_return(m, 0);
         assert_return(m->hdr, 0);
 
         return m->hdr->nlmsg_type == NLMSG_ERROR;
 }
 
-int sd_netlink_message_get_errno(sd_netlink_message *m) {
+int sd_netlink_message_get_errno(const sd_netlink_message *m) {
         struct nlmsgerr *err;
 
         assert_return(m, -EINVAL);
diff --git a/src/libsystemd/sd-netlink/netlink-slot.c b/src/libsystemd/sd-netlink/netlink-slot.c
index 2b8675d..94a80a8 100644
--- a/src/libsystemd/sd-netlink/netlink-slot.c
+++ b/src/libsystemd/sd-netlink/netlink-slot.c
@@ -142,7 +142,7 @@ void *sd_netlink_slot_set_userdata(sd_netlink_slot *slot, void *userdata) {
         return ret;
 }
 
-int sd_netlink_slot_get_destroy_callback(sd_netlink_slot *slot, sd_netlink_destroy_t *callback) {
+int sd_netlink_slot_get_destroy_callback(const sd_netlink_slot *slot, sd_netlink_destroy_t *callback) {
         assert_return(slot, -EINVAL);
 
         if (callback)
@@ -158,7 +158,7 @@ int sd_netlink_slot_set_destroy_callback(sd_netlink_slot *slot, sd_netlink_destr
         return 0;
 }
 
-int sd_netlink_slot_get_floating(sd_netlink_slot *slot) {
+int sd_netlink_slot_get_floating(const sd_netlink_slot *slot) {
         assert_return(slot, -EINVAL);
 
         return slot->floating;
@@ -186,7 +186,7 @@ int sd_netlink_slot_set_floating(sd_netlink_slot *slot, int b) {
         return 1;
 }
 
-int sd_netlink_slot_get_description(sd_netlink_slot *slot, const char **description) {
+int sd_netlink_slot_get_description(const sd_netlink_slot *slot, const char **description) {
         assert_return(slot, -EINVAL);
 
         if (description)
diff --git a/src/libsystemd/sd-netlink/rtnl-message.c b/src/libsystemd/sd-netlink/rtnl-message.c
index 8cba0cc..429b21b 100644
--- a/src/libsystemd/sd-netlink/rtnl-message.c
+++ b/src/libsystemd/sd-netlink/rtnl-message.c
@@ -80,7 +80,7 @@ int sd_rtnl_message_route_set_flags(sd_netlink_message *m, unsigned flags) {
         return 0;
 }
 
-int sd_rtnl_message_route_get_flags(sd_netlink_message *m, unsigned *flags) {
+int sd_rtnl_message_route_get_flags(const sd_netlink_message *m, unsigned *flags) {
         struct rtmsg *rtm;
 
         assert_return(m, -EINVAL);
@@ -109,7 +109,7 @@ int sd_rtnl_message_route_set_table(sd_netlink_message *m, unsigned char table)
         return 0;
 }
 
-int sd_rtnl_message_route_get_family(sd_netlink_message *m, int *family) {
+int sd_rtnl_message_route_get_family(const sd_netlink_message *m, int *family) {
         struct rtmsg *rtm;
 
         assert_return(m, -EINVAL);
@@ -138,7 +138,7 @@ int sd_rtnl_message_route_set_family(sd_netlink_message *m, int family) {
         return 0;
 }
 
-int sd_rtnl_message_route_get_type(sd_netlink_message *m, unsigned char *type) {
+int sd_rtnl_message_route_get_type(const sd_netlink_message *m, unsigned char *type) {
         struct rtmsg *rtm;
 
         assert_return(m, -EINVAL);
@@ -167,7 +167,7 @@ int sd_rtnl_message_route_set_type(sd_netlink_message *m, unsigned char type) {
         return 0;
 }
 
-int sd_rtnl_message_route_get_protocol(sd_netlink_message *m, unsigned char *protocol) {
+int sd_rtnl_message_route_get_protocol(const sd_netlink_message *m, unsigned char *protocol) {
         struct rtmsg *rtm;
 
         assert_return(m, -EINVAL);
@@ -182,7 +182,7 @@ int sd_rtnl_message_route_get_protocol(sd_netlink_message *m, unsigned char *pro
         return 0;
 }
 
-int sd_rtnl_message_route_get_scope(sd_netlink_message *m, unsigned char *scope) {
+int sd_rtnl_message_route_get_scope(const sd_netlink_message *m, unsigned char *scope) {
         struct rtmsg *rtm;
 
         assert_return(m, -EINVAL);
@@ -197,7 +197,7 @@ int sd_rtnl_message_route_get_scope(sd_netlink_message *m, unsigned char *scope)
         return 0;
 }
 
-int sd_rtnl_message_route_get_tos(sd_netlink_message *m, unsigned char *tos) {
+int sd_rtnl_message_route_get_tos(const sd_netlink_message *m, unsigned char *tos) {
         struct rtmsg *rtm;
 
         assert_return(m, -EINVAL);
@@ -212,7 +212,7 @@ int sd_rtnl_message_route_get_tos(sd_netlink_message *m, unsigned char *tos) {
         return 0;
 }
 
-int sd_rtnl_message_route_get_table(sd_netlink_message *m, unsigned char *table) {
+int sd_rtnl_message_route_get_table(const sd_netlink_message *m, unsigned char *table) {
         struct rtmsg *rtm;
 
         assert_return(m, -EINVAL);
@@ -227,7 +227,7 @@ int sd_rtnl_message_route_get_table(sd_netlink_message *m, unsigned char *table)
         return 0;
 }
 
-int sd_rtnl_message_route_get_dst_prefixlen(sd_netlink_message *m, unsigned char *dst_len) {
+int sd_rtnl_message_route_get_dst_prefixlen(const sd_netlink_message *m, unsigned char *dst_len) {
         struct rtmsg *rtm;
 
         assert_return(m, -EINVAL);
@@ -242,7 +242,7 @@ int sd_rtnl_message_route_get_dst_prefixlen(sd_netlink_message *m, unsigned char
         return 0;
 }
 
-int sd_rtnl_message_route_get_src_prefixlen(sd_netlink_message *m, unsigned char *src_len) {
+int sd_rtnl_message_route_get_src_prefixlen(const sd_netlink_message *m, unsigned char *src_len) {
         struct rtmsg *rtm;
 
         assert_return(m, -EINVAL);
@@ -338,7 +338,7 @@ int sd_rtnl_message_nexthop_set_family(sd_netlink_message *m, uint8_t family) {
         return 0;
 }
 
-int sd_rtnl_message_nexthop_get_family(sd_netlink_message *m, uint8_t *family) {
+int sd_rtnl_message_nexthop_get_family(const sd_netlink_message *m, uint8_t *family) {
         struct nhmsg *nhm;
 
         assert_return(m, -EINVAL);
@@ -376,7 +376,7 @@ int sd_rtnl_message_neigh_set_state(sd_netlink_message *m, uint16_t state) {
         return 0;
 }
 
-int sd_rtnl_message_neigh_get_flags(sd_netlink_message *m, uint8_t *flags) {
+int sd_rtnl_message_neigh_get_flags(const sd_netlink_message *m, uint8_t *flags) {
         struct ndmsg *ndm;
 
         assert_return(m, -EINVAL);
@@ -389,7 +389,7 @@ int sd_rtnl_message_neigh_get_flags(sd_netlink_message *m, uint8_t *flags) {
         return 0;
 }
 
-int sd_rtnl_message_neigh_get_state(sd_netlink_message *m, uint16_t *state) {
+int sd_rtnl_message_neigh_get_state(const sd_netlink_message *m, uint16_t *state) {
         struct ndmsg *ndm;
 
         assert_return(m, -EINVAL);
@@ -402,7 +402,7 @@ int sd_rtnl_message_neigh_get_state(sd_netlink_message *m, uint16_t *state) {
         return 0;
 }
 
-int sd_rtnl_message_neigh_get_family(sd_netlink_message *m, int *family) {
+int sd_rtnl_message_neigh_get_family(const sd_netlink_message *m, int *family) {
         struct ndmsg *ndm;
 
         assert_return(m, -EINVAL);
@@ -417,7 +417,7 @@ int sd_rtnl_message_neigh_get_family(sd_netlink_message *m, int *family) {
         return 0;
 }
 
-int sd_rtnl_message_neigh_get_ifindex(sd_netlink_message *m, int *index) {
+int sd_rtnl_message_neigh_get_ifindex(const sd_netlink_message *m, int *index) {
         struct ndmsg *ndm;
 
         assert_return(m, -EINVAL);
@@ -568,7 +568,7 @@ int sd_rtnl_message_addr_set_scope(sd_netlink_message *m, unsigned char scope) {
         return 0;
 }
 
-int sd_rtnl_message_addr_get_family(sd_netlink_message *m, int *family) {
+int sd_rtnl_message_addr_get_family(const sd_netlink_message *m, int *family) {
         struct ifaddrmsg *ifa;
 
         assert_return(m, -EINVAL);
@@ -583,7 +583,7 @@ int sd_rtnl_message_addr_get_family(sd_netlink_message *m, int *family) {
         return 0;
 }
 
-int sd_rtnl_message_addr_get_prefixlen(sd_netlink_message *m, unsigned char *prefixlen) {
+int sd_rtnl_message_addr_get_prefixlen(const sd_netlink_message *m, unsigned char *prefixlen) {
         struct ifaddrmsg *ifa;
 
         assert_return(m, -EINVAL);
@@ -598,7 +598,7 @@ int sd_rtnl_message_addr_get_prefixlen(sd_netlink_message *m, unsigned char *pre
         return 0;
 }
 
-int sd_rtnl_message_addr_get_scope(sd_netlink_message *m, unsigned char *scope) {
+int sd_rtnl_message_addr_get_scope(const sd_netlink_message *m, unsigned char *scope) {
         struct ifaddrmsg *ifa;
 
         assert_return(m, -EINVAL);
@@ -613,7 +613,7 @@ int sd_rtnl_message_addr_get_scope(sd_netlink_message *m, unsigned char *scope)
         return 0;
 }
 
-int sd_rtnl_message_addr_get_flags(sd_netlink_message *m, unsigned char *flags) {
+int sd_rtnl_message_addr_get_flags(const sd_netlink_message *m, unsigned char *flags) {
         struct ifaddrmsg *ifa;
 
         assert_return(m, -EINVAL);
@@ -628,7 +628,7 @@ int sd_rtnl_message_addr_get_flags(sd_netlink_message *m, unsigned char *flags)
         return 0;
 }
 
-int sd_rtnl_message_addr_get_ifindex(sd_netlink_message *m, int *ifindex) {
+int sd_rtnl_message_addr_get_ifindex(const sd_netlink_message *m, int *ifindex) {
         struct ifaddrmsg *ifa;
 
         assert_return(m, -EINVAL);
@@ -688,7 +688,7 @@ int sd_rtnl_message_new_addr_update(sd_netlink *rtnl, sd_netlink_message **ret,
         return 0;
 }
 
-int sd_rtnl_message_link_get_ifindex(sd_netlink_message *m, int *ifindex) {
+int sd_rtnl_message_link_get_ifindex(const sd_netlink_message *m, int *ifindex) {
         struct ifinfomsg *ifi;
 
         assert_return(m, -EINVAL);
@@ -703,7 +703,7 @@ int sd_rtnl_message_link_get_ifindex(sd_netlink_message *m, int *ifindex) {
         return 0;
 }
 
-int sd_rtnl_message_link_get_flags(sd_netlink_message *m, unsigned *flags) {
+int sd_rtnl_message_link_get_flags(const sd_netlink_message *m, unsigned *flags) {
         struct ifinfomsg *ifi;
 
         assert_return(m, -EINVAL);
@@ -718,7 +718,7 @@ int sd_rtnl_message_link_get_flags(sd_netlink_message *m, unsigned *flags) {
         return 0;
 }
 
-int sd_rtnl_message_link_get_type(sd_netlink_message *m, unsigned short *type) {
+int sd_rtnl_message_link_get_type(const sd_netlink_message *m, unsigned short *type) {
         struct ifinfomsg *ifi;
 
         assert_return(m, -EINVAL);
@@ -733,7 +733,7 @@ int sd_rtnl_message_link_get_type(sd_netlink_message *m, unsigned short *type) {
         return 0;
 }
 
-int sd_rtnl_message_get_family(sd_netlink_message *m, int *family) {
+int sd_rtnl_message_get_family(const sd_netlink_message *m, int *family) {
         assert_return(m, -EINVAL);
         assert_return(family, -EINVAL);
 
@@ -831,7 +831,7 @@ int sd_rtnl_message_addrlabel_set_prefixlen(sd_netlink_message *m, unsigned char
         return 0;
 }
 
-int sd_rtnl_message_addrlabel_get_prefixlen(sd_netlink_message *m, unsigned char *prefixlen) {
+int sd_rtnl_message_addrlabel_get_prefixlen(const sd_netlink_message *m, unsigned char *prefixlen) {
         struct ifaddrlblmsg *addrlabel;
 
         assert_return(m, -EINVAL);
@@ -882,7 +882,7 @@ int sd_rtnl_message_routing_policy_rule_set_tos(sd_netlink_message *m, unsigned
         return 0;
 }
 
-int sd_rtnl_message_routing_policy_rule_get_tos(sd_netlink_message *m, unsigned char *tos) {
+int sd_rtnl_message_routing_policy_rule_get_tos(const sd_netlink_message *m, unsigned char *tos) {
         struct rtmsg *routing_policy_rule;
 
         assert_return(m, -EINVAL);
@@ -910,7 +910,7 @@ int sd_rtnl_message_routing_policy_rule_set_table(sd_netlink_message *m, unsigne
         return 0;
 }
 
-int sd_rtnl_message_routing_policy_rule_get_table(sd_netlink_message *m, unsigned char *table) {
+int sd_rtnl_message_routing_policy_rule_get_table(const sd_netlink_message *m, unsigned char *table) {
         struct rtmsg *routing_policy_rule;
 
         assert_return(m, -EINVAL);
@@ -937,7 +937,7 @@ int sd_rtnl_message_routing_policy_rule_set_flags(sd_netlink_message *m, unsigne
         return 0;
 }
 
-int sd_rtnl_message_routing_policy_rule_get_flags(sd_netlink_message *m, unsigned *flags) {
+int sd_rtnl_message_routing_policy_rule_get_flags(const sd_netlink_message *m, unsigned *flags) {
         struct rtmsg *routing_policy_rule;
 
         assert_return(m, -EINVAL);
@@ -964,7 +964,7 @@ int sd_rtnl_message_routing_policy_rule_set_rtm_type(sd_netlink_message *m, unsi
         return 0;
 }
 
-int sd_rtnl_message_routing_policy_rule_get_rtm_type(sd_netlink_message *m, unsigned char *type) {
+int sd_rtnl_message_routing_policy_rule_get_rtm_type(const sd_netlink_message *m, unsigned char *type) {
         struct rtmsg *routing_policy_rule;
 
         assert_return(m, -EINVAL);
@@ -992,7 +992,7 @@ int sd_rtnl_message_routing_policy_rule_set_rtm_dst_prefixlen(sd_netlink_message
         return 0;
 }
 
-int sd_rtnl_message_routing_policy_rule_get_rtm_dst_prefixlen(sd_netlink_message *m, unsigned char *len) {
+int sd_rtnl_message_routing_policy_rule_get_rtm_dst_prefixlen(const sd_netlink_message *m, unsigned char *len) {
         struct rtmsg *routing_policy_rule;
 
         assert_return(m, -EINVAL);
@@ -1020,7 +1020,7 @@ int sd_rtnl_message_routing_policy_rule_set_rtm_src_prefixlen(sd_netlink_message
         return 0;
 }
 
-int sd_rtnl_message_routing_policy_rule_get_rtm_src_prefixlen(sd_netlink_message *m, unsigned char *len) {
+int sd_rtnl_message_routing_policy_rule_get_rtm_src_prefixlen(const sd_netlink_message *m, unsigned char *len) {
         struct rtmsg *routing_policy_rule;
 
         assert_return(m, -EINVAL);
diff --git a/src/libsystemd/sd-netlink/sd-netlink.c b/src/libsystemd/sd-netlink/sd-netlink.c
index ce2ad36..99b9705 100644
--- a/src/libsystemd/sd-netlink/sd-netlink.c
+++ b/src/libsystemd/sd-netlink/sd-netlink.c
@@ -79,7 +79,7 @@ int sd_netlink_new_from_netlink(sd_netlink **ret, int fd) {
         return 0;
 }
 
-static bool rtnl_pid_changed(sd_netlink *rtnl) {
+static bool rtnl_pid_changed(const sd_netlink *rtnl) {
         assert(rtnl);
 
         /* We don't support people creating an rtnl connection and
@@ -673,7 +673,7 @@ int sd_netlink_call(sd_netlink *rtnl,
         }
 }
 
-int sd_netlink_get_events(sd_netlink *rtnl) {
+int sd_netlink_get_events(const sd_netlink *rtnl) {
         assert_return(rtnl, -EINVAL);
         assert_return(!rtnl_pid_changed(rtnl), -ECHILD);
 
@@ -683,7 +683,7 @@ int sd_netlink_get_events(sd_netlink *rtnl) {
                 return 0;
 }
 
-int sd_netlink_get_timeout(sd_netlink *rtnl, uint64_t *timeout_usec) {
+int sd_netlink_get_timeout(const sd_netlink *rtnl, uint64_t *timeout_usec) {
         struct reply_callback *c;
 
         assert_return(rtnl, -EINVAL);
diff --git a/src/systemd/sd-netlink.h b/src/systemd/sd-netlink.h
index 53ac457..099d76d 100644
--- a/src/systemd/sd-netlink.h
+++ b/src/systemd/sd-netlink.h
@@ -66,8 +66,8 @@ int sd_netlink_call_async(sd_netlink *nl, sd_netlink_slot **ret_slot, sd_netlink
 int sd_netlink_call(sd_netlink *nl, sd_netlink_message *message, uint64_t timeout,
                     sd_netlink_message **reply);
 
-int sd_netlink_get_events(sd_netlink *nl);
-int sd_netlink_get_timeout(sd_netlink *nl, uint64_t *timeout);
+int sd_netlink_get_events(const sd_netlink *nl);
+int sd_netlink_get_timeout(const sd_netlink *nl, uint64_t *timeout);
 int sd_netlink_process(sd_netlink *nl, sd_netlink_message **ret);
 int sd_netlink_wait(sd_netlink *nl, uint64_t timeout);
 
@@ -122,11 +122,11 @@ sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m);
 sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m);
 
 int sd_netlink_message_request_dump(sd_netlink_message *m, int dump);
-int sd_netlink_message_is_error(sd_netlink_message *m);
-int sd_netlink_message_get_errno(sd_netlink_message *m);
-int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type);
+int sd_netlink_message_is_error(const sd_netlink_message *m);
+int sd_netlink_message_get_errno(const sd_netlink_message *m);
+int sd_netlink_message_get_type(const sd_netlink_message *m, uint16_t *type);
 int sd_netlink_message_set_flags(sd_netlink_message *m, uint16_t flags);
-int sd_netlink_message_is_broadcast(sd_netlink_message *m);
+int sd_netlink_message_is_broadcast(const sd_netlink_message *m);
 
 /* rtnl */
 
@@ -136,23 +136,23 @@ int sd_rtnl_message_new_addr(sd_netlink *nl, sd_netlink_message **ret, uint16_t
 int sd_rtnl_message_new_route(sd_netlink *nl, sd_netlink_message **ret, uint16_t nlmsg_type, int rtm_family, unsigned char rtm_protocol);
 int sd_rtnl_message_new_neigh(sd_netlink *nl, sd_netlink_message **ret, uint16_t msg_type, int index, int nda_family);
 
-int sd_rtnl_message_get_family(sd_netlink_message *m, int *family);
+int sd_rtnl_message_get_family(const sd_netlink_message *m, int *family);
 
 int sd_rtnl_message_addr_set_prefixlen(sd_netlink_message *m, unsigned char prefixlen);
 int sd_rtnl_message_addr_set_scope(sd_netlink_message *m, unsigned char scope);
 int sd_rtnl_message_addr_set_flags(sd_netlink_message *m, unsigned char flags);
-int sd_rtnl_message_addr_get_family(sd_netlink_message *m, int *family);
-int sd_rtnl_message_addr_get_prefixlen(sd_netlink_message *m, unsigned char *prefixlen);
-int sd_rtnl_message_addr_get_scope(sd_netlink_message *m, unsigned char *scope);
-int sd_rtnl_message_addr_get_flags(sd_netlink_message *m, unsigned char *flags);
-int sd_rtnl_message_addr_get_ifindex(sd_netlink_message *m, int *ifindex);
+int sd_rtnl_message_addr_get_family(const sd_netlink_message *m, int *family);
+int sd_rtnl_message_addr_get_prefixlen(const sd_netlink_message *m, unsigned char *prefixlen);
+int sd_rtnl_message_addr_get_scope(const sd_netlink_message *m, unsigned char *scope);
+int sd_rtnl_message_addr_get_flags(const sd_netlink_message *m, unsigned char *flags);
+int sd_rtnl_message_addr_get_ifindex(const sd_netlink_message *m, int *ifindex);
 
 int sd_rtnl_message_link_set_flags(sd_netlink_message *m, unsigned flags, unsigned change);
 int sd_rtnl_message_link_set_type(sd_netlink_message *m, unsigned type);
 int sd_rtnl_message_link_set_family(sd_netlink_message *m, unsigned family);
-int sd_rtnl_message_link_get_ifindex(sd_netlink_message *m, int *ifindex);
-int sd_rtnl_message_link_get_flags(sd_netlink_message *m, unsigned *flags);
-int sd_rtnl_message_link_get_type(sd_netlink_message *m, unsigned short *type);
+int sd_rtnl_message_link_get_ifindex(const sd_netlink_message *m, int *ifindex);
+int sd_rtnl_message_link_get_flags(const sd_netlink_message *m, unsigned *flags);
+int sd_rtnl_message_link_get_type(const sd_netlink_message *m, unsigned short *type);
 
 int sd_rtnl_message_route_set_dst_prefixlen(sd_netlink_message *m, unsigned char prefixlen);
 int sd_rtnl_message_route_set_src_prefixlen(sd_netlink_message *m, unsigned char prefixlen);
@@ -160,52 +160,52 @@ int sd_rtnl_message_route_set_scope(sd_netlink_message *m, unsigned char scope);
 int sd_rtnl_message_route_set_flags(sd_netlink_message *m, unsigned flags);
 int sd_rtnl_message_route_set_table(sd_netlink_message *m, unsigned char table);
 int sd_rtnl_message_route_set_type(sd_netlink_message *m, unsigned char type);
-int sd_rtnl_message_route_get_flags(sd_netlink_message *m, unsigned *flags);
-int sd_rtnl_message_route_get_family(sd_netlink_message *m, int *family);
+int sd_rtnl_message_route_get_flags(const sd_netlink_message *m, unsigned *flags);
+int sd_rtnl_message_route_get_family(const sd_netlink_message *m, int *family);
 int sd_rtnl_message_route_set_family(sd_netlink_message *m, int family);
-int sd_rtnl_message_route_get_protocol(sd_netlink_message *m, unsigned char *protocol);
-int sd_rtnl_message_route_get_scope(sd_netlink_message *m, unsigned char *scope);
-int sd_rtnl_message_route_get_tos(sd_netlink_message *m, unsigned char *tos);
-int sd_rtnl_message_route_get_table(sd_netlink_message *m, unsigned char *table);
-int sd_rtnl_message_route_get_dst_prefixlen(sd_netlink_message *m, unsigned char *dst_len);
-int sd_rtnl_message_route_get_src_prefixlen(sd_netlink_message *m, unsigned char *src_len);
-int sd_rtnl_message_route_get_type(sd_netlink_message *m, unsigned char *type);
+int sd_rtnl_message_route_get_protocol(const sd_netlink_message *m, unsigned char *protocol);
+int sd_rtnl_message_route_get_scope(const sd_netlink_message *m, unsigned char *scope);
+int sd_rtnl_message_route_get_tos(const sd_netlink_message *m, unsigned char *tos);
+int sd_rtnl_message_route_get_table(const sd_netlink_message *m, unsigned char *table);
+int sd_rtnl_message_route_get_dst_prefixlen(const sd_netlink_message *m, unsigned char *dst_len);
+int sd_rtnl_message_route_get_src_prefixlen(const sd_netlink_message *m, unsigned char *src_len);
+int sd_rtnl_message_route_get_type(const sd_netlink_message *m, unsigned char *type);
 
 int sd_rtnl_message_new_nexthop(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t nhmsg_type, int nh_family, unsigned char nh_protocol);
 
 int sd_rtnl_message_nexthop_set_flags(sd_netlink_message *m, uint8_t flags);
 int sd_rtnl_message_nexthop_set_family(sd_netlink_message *m, uint8_t family);
-int sd_rtnl_message_nexthop_get_family(sd_netlink_message *m, uint8_t *family);
+int sd_rtnl_message_nexthop_get_family(const sd_netlink_message *m, uint8_t *family);
 
 int sd_rtnl_message_neigh_set_flags(sd_netlink_message *m, uint8_t flags);
 int sd_rtnl_message_neigh_set_state(sd_netlink_message *m, uint16_t state);
-int sd_rtnl_message_neigh_get_family(sd_netlink_message *m, int *family);
-int sd_rtnl_message_neigh_get_ifindex(sd_netlink_message *m, int *family);
-int sd_rtnl_message_neigh_get_state(sd_netlink_message *m, uint16_t *state);
-int sd_rtnl_message_neigh_get_flags(sd_netlink_message *m, uint8_t *flags);
+int sd_rtnl_message_neigh_get_family(const sd_netlink_message *m, int *family);
+int sd_rtnl_message_neigh_get_ifindex(const sd_netlink_message *m, int *family);
+int sd_rtnl_message_neigh_get_state(const sd_netlink_message *m, uint16_t *state);
+int sd_rtnl_message_neigh_get_flags(const sd_netlink_message *m, uint8_t *flags);
 
 int sd_rtnl_message_new_addrlabel(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t nlmsg_type, int ifindex, int ifal_family);
 int sd_rtnl_message_addrlabel_set_prefixlen(sd_netlink_message *m, unsigned char prefixlen);
-int sd_rtnl_message_addrlabel_get_prefixlen(sd_netlink_message *m, unsigned char *prefixlen);
+int sd_rtnl_message_addrlabel_get_prefixlen(const sd_netlink_message *m, unsigned char *prefixlen);
 
 int sd_rtnl_message_new_routing_policy_rule(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t nlmsg_type, int ifal_family);
 int sd_rtnl_message_routing_policy_rule_set_tos(sd_netlink_message *m, unsigned char tos);
-int sd_rtnl_message_routing_policy_rule_get_tos(sd_netlink_message *m, unsigned char *tos);
+int sd_rtnl_message_routing_policy_rule_get_tos(const sd_netlink_message *m, unsigned char *tos);
 int sd_rtnl_message_routing_policy_rule_set_table(sd_netlink_message *m, unsigned char table);
-int sd_rtnl_message_routing_policy_rule_get_table(sd_netlink_message *m, unsigned char *table);
+int sd_rtnl_message_routing_policy_rule_get_table(const sd_netlink_message *m, unsigned char *table);
 int sd_rtnl_message_routing_policy_rule_set_rtm_src_prefixlen(sd_netlink_message *m, unsigned char len);
-int sd_rtnl_message_routing_policy_rule_get_rtm_src_prefixlen(sd_netlink_message *m, unsigned char *len);
+int sd_rtnl_message_routing_policy_rule_get_rtm_src_prefixlen(const sd_netlink_message *m, unsigned char *len);
 int sd_rtnl_message_routing_policy_rule_set_rtm_dst_prefixlen(sd_netlink_message *m, unsigned char len);
-int sd_rtnl_message_routing_policy_rule_get_rtm_dst_prefixlen(sd_netlink_message *m, unsigned char *len);
+int sd_rtnl_message_routing_policy_rule_get_rtm_dst_prefixlen(const sd_netlink_message *m, unsigned char *len);
 int sd_rtnl_message_routing_policy_rule_set_rtm_type(sd_netlink_message *m, unsigned char type);
-int sd_rtnl_message_routing_policy_rule_get_rtm_type(sd_netlink_message *m, unsigned char *type);
+int sd_rtnl_message_routing_policy_rule_get_rtm_type(const sd_netlink_message *m, unsigned char *type);
 int sd_rtnl_message_routing_policy_rule_set_flags(sd_netlink_message *m, unsigned flags);
-int sd_rtnl_message_routing_policy_rule_get_flags(sd_netlink_message *m, unsigned *flags);
+int sd_rtnl_message_routing_policy_rule_get_flags(const sd_netlink_message *m, unsigned *flags);
 
 /* genl */
 int sd_genl_socket_open(sd_netlink **nl);
 int sd_genl_message_new(sd_netlink *nl, sd_genl_family family, uint8_t cmd, sd_netlink_message **m);
-int sd_genl_message_get_family(sd_netlink *nl, sd_netlink_message *m, sd_genl_family *family);
+int sd_genl_message_get_family(const sd_netlink *nl, const sd_netlink_message *m, sd_genl_family *family);
 
 /* slot */
 sd_netlink_slot *sd_netlink_slot_ref(sd_netlink_slot *nl);
@@ -214,11 +214,11 @@ sd_netlink_slot *sd_netlink_slot_unref(sd_netlink_slot *nl);
 sd_netlink *sd_netlink_slot_get_netlink(sd_netlink_slot *slot);
 void *sd_netlink_slot_get_userdata(sd_netlink_slot *slot);
 void *sd_netlink_slot_set_userdata(sd_netlink_slot *slot, void *userdata);
-int sd_netlink_slot_get_destroy_callback(sd_netlink_slot *slot, sd_netlink_destroy_t *callback);
+int sd_netlink_slot_get_destroy_callback(const sd_netlink_slot *slot, sd_netlink_destroy_t *callback);
 int sd_netlink_slot_set_destroy_callback(sd_netlink_slot *slot, sd_netlink_destroy_t callback);
-int sd_netlink_slot_get_floating(sd_netlink_slot *slot);
+int sd_netlink_slot_get_floating(const sd_netlink_slot *slot);
 int sd_netlink_slot_set_floating(sd_netlink_slot *slot, int b);
-int sd_netlink_slot_get_description(sd_netlink_slot *slot, const char **description);
+int sd_netlink_slot_get_description(const sd_netlink_slot *slot, const char **description);
 int sd_netlink_slot_set_description(sd_netlink_slot *slot, const char *description);
 
 _SD_DEFINE_POINTER_CLEANUP_FUNC(sd_netlink, sd_netlink_unref);
-- 
2.7.4