1 http://bugs.proftpd.org/show_bug.cgi?id=4109

     2 https://github.com/proftpd/proftpd/commit/0b8afb267eb6fd6acf98595a8c2812cd27ac11a0

     3 

     4 diff --git a/src/inet.c b/src/inet.c

     5 index f5602e0..d0a0631 100644

     6 --- a/src/inet.c

     7 +++ b/src/inet.c

     8 @@ -770,8 +770,9 @@ int pr_inet_set_proto_opts(pool *p, conn_t *c, int mss, int nodelay,

     9    if (pr_netaddr_use_ipv6()) {

    10      /* Only set TCLASS flags on IPv6 sockets; IPv4 sockets use TOS. */

    11      if (pr_netaddr_get_family(c->local_addr) == AF_INET6) {

    12 +      int level = ipv6_proto;

    13        if (c->listen_fd != -1) {

    14 -        if (setsockopt(c->listen_fd, ip_level, IPV6_TCLASS, (void *) &tos,

    15 +        if (setsockopt(c->listen_fd, level, IPV6_TCLASS, (void *) &tos,

    16              sizeof(tos)) < 0) {

    17            pr_log_pri(PR_LOG_NOTICE, "error setting listen fd IPV6_TCLASS: %s",

    18              strerror(errno));