update netinet/in.h to match the current kernel uapi

from linux/in.h and linux/in6.h uapi headers the following
missing socket options were added:

IP_NODEFRAG - used with customized ipv4 headers
IPV6_RECVPATHMTU - for ipv6 path mtu
IPV6_PATHMTU - for ipv6 path mtu
IPV6_DONTFRAG - for ipv6 path mtu
IPV6_ADDR_PREFERENCES - RFC5014 Source Address Selection
IPV6_MINHOPCOUNT - RFC5082 Generalized TTL Security Mechanism
IPV6_ORIGDSTADDR - used by tproxy
IPV6_RECVORIGDSTADDR - used by tproxy
IPV6_TRANSPARENT - used by tproxy
IPV6_UNICAST_IF - ipv6 version of IP_UNICAST_IF

and socket option values:

IP_PMTUDISC_OMIT - value for IP_MTU_DISCOVER option, new in linux 3.14
IPV6_PMTUDISC_OMIT - same for IPV6_MTU_DISCOVER
IPV6_PMTUDISC_INTERFACE - ipv6 version of IP_PMTUDISC_INTERFACE
IPV6_PREFER_* - flags for IPV6_ADDR_PREFERENCES

not added: ipv6 flow info and flow label related definitions.
(it's unclear if libc should define these and namespace polluting
type name is involved so they are not provided for now)

include/netinet/in.h

@@ -198,6 +198,7 @@ uint16_t ntohs(uint16_t);
 #define IP_ORIGDSTADDR     20
 #define IP_RECVORIGDSTADDR IP_ORIGDSTADDR
 #define IP_MINTTL          21
+#define IP_NODEFRAG        22
 #define IP_MULTICAST_IF    32
 #define IP_MULTICAST_TTL   33
 #define IP_MULTICAST_LOOP  34
@@ -218,6 +219,7 @@ uint16_t ntohs(uint16_t);
 #define IP_PMTUDISC_DO     2
 #define IP_PMTUDISC_PROBE  3
 #define IP_PMTUDISC_INTERFACE 4
+#define IP_PMTUDISC_OMIT   5
 
 #define IP_DEFAULT_MULTICAST_TTL        1
 #define IP_DEFAULT_MULTICAST_LOOP       1
@@ -351,9 +353,17 @@ struct ip6_mtuinfo
 #define IPV6_RTHDR              57
 #define IPV6_RECVDSTOPTS        58
 #define IPV6_DSTOPTS            59
-
+#define IPV6_RECVPATHMTU        60
+#define IPV6_PATHMTU            61
+#define IPV6_DONTFRAG           62
 #define IPV6_RECVTCLASS         66
 #define IPV6_TCLASS             67
+#define IPV6_ADDR_PREFERENCES   72
+#define IPV6_MINHOPCOUNT        73
+#define IPV6_ORIGDSTADDR        74
+#define IPV6_RECVORIGDSTADDR    IPV6_ORIGDSTADDR
+#define IPV6_TRANSPARENT        75
+#define IPV6_UNICAST_IF         76
 
 #define IPV6_ADD_MEMBERSHIP     IPV6_JOIN_GROUP
 #define IPV6_DROP_MEMBERSHIP    IPV6_LEAVE_GROUP
@@ -364,6 +374,16 @@ struct ip6_mtuinfo
 #define IPV6_PMTUDISC_WANT      1
 #define IPV6_PMTUDISC_DO        2
 #define IPV6_PMTUDISC_PROBE     3
+#define IPV6_PMTUDISC_INTERFACE 4
+#define IPV6_PMTUDISC_OMIT      5
+
+#define IPV6_PREFER_SRC_TMP            0x0001
+#define IPV6_PREFER_SRC_PUBLIC         0x0002
+#define IPV6_PREFER_SRC_PUBTMP_DEFAULT 0x0100
+#define IPV6_PREFER_SRC_COA            0x0004
+#define IPV6_PREFER_SRC_HOME           0x0400
+#define IPV6_PREFER_SRC_CGA            0x0008
+#define IPV6_PREFER_SRC_NONCGA         0x0800
 
 #define IPV6_RTHDR_LOOSE        0
 #define IPV6_RTHDR_STRICT       1