diff --git a/src/header/netinet_in/mod.rs b/src/header/netinet_in/mod.rs
index 763772be80..3d0118f33f 100644
--- a/src/header/netinet_in/mod.rs
+++ b/src/header/netinet_in/mod.rs
@@ -108,6 +108,14 @@ pub const IPV6_DROP_MEMBERSHIP: c_int = 21;
 pub const IPV6_LEAVE_GROUP: c_int = 21;
 /// See <https://pubs.opengroup.org/onlinepubs/9799919799/basedefs/netinet_in.h.html>.
 pub const IPV6_V6ONLY: c_int = 26;
+/// Non-POSIX, see <https://www.man7.org/linux/man-pages/man7/ipv6.7.html>.
+pub const IPV6_RECVPKTINFO: c_int = 49;
+/// Non-POSIX, see <https://www.man7.org/linux/man-pages/man7/ipv6.7.html>.
+pub const IPV6_PKTINFO: c_int = 50;
+/// Non-POSIX, see <https://www.man7.org/linux/man-pages/man7/ipv6.7.html>.
+pub const IPV6_RECVTCLASS: c_int = 66;
+/// Non-POSIX, see <https://www.man7.org/linux/man-pages/man7/ipv6.7.html>.
+pub const IPV6_TCLASS: c_int = 67;
 /// Non-POSIX, see <https://www.man7.org/linux/man-pages/man7/ip.7.html>.
 pub const IP_MULTICAST_IF: c_int = 32;
 /// Non-POSIX, see <https://www.man7.org/linux/man-pages/man7/ip.7.html>.