fix remaining known namespace violations for netinet/in.h

the imr_, imsf_, ip6_, ip6m_, ipi_, ipi6_, SCM_, and SOL_ prefixes are
not in the reserved namespace for this header. thus the constants and
structures using them need to be protected under appropriate feature
test macros.

this also affects some headers which are permitted to include
netinet/in.h, particularly netdb.h and arpa/inet.h.

the SOL_ macros are moved to sys/socket.h where they are in the
reserved namespace (SO*). they are still accessible via netinet/in.h
since it includes sys/socket.h implicitly (which is permitted).

the SCM_SRCRT macro is simply removed, since the definition used for
it, IPV6_RXSRCRT is not defined anywhere. it could be re-added, this
time in sys/socket.h, if the appropriate value can be determined;
however, given that the erroneous definition was not caught, it is
unlikely that any software actually attempts to use SCM_SRCRT.

include/netinet/in.h

@@ -211,19 +211,6 @@ uint16_t ntohs(uint16_t);
 #define IP_MULTICAST_ALL   49
 #define IP_UNICAST_IF      50
 
-#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define MCAST_JOIN_GROUP   42
-#define MCAST_BLOCK_SOURCE 43
-#define MCAST_UNBLOCK_SOURCE      44
-#define MCAST_LEAVE_GROUP  45
-#define MCAST_JOIN_SOURCE_GROUP   46
-#define MCAST_LEAVE_SOURCE_GROUP  47
-#define MCAST_MSFILTER     48
-
-#define MCAST_EXCLUDE 0
-#define MCAST_INCLUDE 1
-#endif
-
 #define IP_RECVRETOPTS IP_RETOPTS
 
 #define IP_PMTUDISC_DONT   0
@@ -231,8 +218,6 @@ uint16_t ntohs(uint16_t);
 #define IP_PMTUDISC_DO     2
 #define IP_PMTUDISC_PROBE  3
 
-#define SOL_IP 0
-
 #define IP_DEFAULT_MULTICAST_TTL        1
 #define IP_DEFAULT_MULTICAST_LOOP       1
 #define IP_MAX_MEMBERSHIPS              20
@@ -243,6 +228,19 @@ struct ip_opts
 	char ip_opts[40];
 };
 
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+
+#define MCAST_JOIN_GROUP   42
+#define MCAST_BLOCK_SOURCE 43
+#define MCAST_UNBLOCK_SOURCE      44
+#define MCAST_LEAVE_GROUP  45
+#define MCAST_JOIN_SOURCE_GROUP   46
+#define MCAST_LEAVE_SOURCE_GROUP  47
+#define MCAST_MSFILTER     48
+
+#define MCAST_EXCLUDE 0
+#define MCAST_INCLUDE 1
+
 struct ip_mreq
 {
 	struct in_addr imr_multiaddr;
@@ -273,7 +271,6 @@ struct ip_msfilter {
 	(sizeof(struct ip_msfilter) - sizeof(struct in_addr) \
 	+ (numsrc) * sizeof(struct in_addr))
 
-#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
 struct group_req {
 	uint32_t gr_interface;
 	struct sockaddr_storage gr_group;
@@ -295,7 +292,6 @@ struct group_filter {
 #define GROUP_FILTER_SIZE(numsrc) \
 	(sizeof(struct group_filter) - sizeof(struct sockaddr_storage) \
 	+ (numsrc) * sizeof(struct sockaddr_storage))
-#endif
 
 struct in_pktinfo
 {
@@ -315,6 +311,7 @@ struct ip6_mtuinfo
 	struct sockaddr_in6 ip6m_addr;
 	uint32_t ip6m_mtu;
 };
+#endif
 
 #define IPV6_ADDRFORM           1
 #define IPV6_2292PKTINFO        2
@@ -324,7 +321,6 @@ struct ip6_mtuinfo
 #define IPV6_2292PKTOPTIONS     6
 #define IPV6_CHECKSUM           7
 #define IPV6_2292HOPLIMIT       8
-#define SCM_SRCRT               IPV6_RXSRCRT
 #define IPV6_NEXTHOP            9
 #define IPV6_AUTHHDR            10
 #define IPV6_UNICAST_HOPS       16
@@ -363,15 +359,11 @@ struct ip6_mtuinfo
 #define IPV6_RXHOPOPTS          IPV6_HOPOPTS
 #define IPV6_RXDSTOPTS          IPV6_DSTOPTS
 
-
 #define IPV6_PMTUDISC_DONT      0
 #define IPV6_PMTUDISC_WANT      1
 #define IPV6_PMTUDISC_DO        2
 #define IPV6_PMTUDISC_PROBE     3
 
-#define SOL_IPV6        41
-#define SOL_ICMPV6      58
-
 #define IPV6_RTHDR_LOOSE        0
 #define IPV6_RTHDR_STRICT       1
 

include/sys/socket.h

@@ -207,6 +207,10 @@ struct linger
 #define SOL_SOCKET      1
 #endif
 
+#define SOL_IP          0
+#define SOL_IPV6        41
+#define SOL_ICMPV6      58
+
 #define SOL_RAW         255
 #define SOL_DECNET      261
 #define SOL_X25         262