From 3979ef91de9ed17d21672aaaefd6c228485135a2 Mon Sep 17 00:00:00 2001 From: Alexandre Cassen Date: Sun, 4 Apr 2010 22:40:14 +0200 Subject: [PATCH] Detect 6rd kernel missing support / 6rd tunnel scope This patch fix two issues: * If kernel is not supporting 6rd then ioctl() call will return EINVAL, if so just skip perror call. * 6rd scope is ipv6/ip tunnels. Dont try to fetch 6rd tunnel parms if tunnel protocol != IPPROTO_IPV6. Signed-off-by: Alexandre Cassen --- ip/iptunnel.c | 2 +- ip/tunnel.c | 11 ++++++----- 2 files changed, 7 insertions(+), 6 deletions(-) diff --git a/ip/iptunnel.c b/ip/iptunnel.c index 1cd9fbd..3525fbb 100644 --- a/ip/iptunnel.c +++ b/ip/iptunnel.c @@ -365,7 +365,7 @@ static void print_tunnel(struct ip_tunnel_parm *p) if (!(p->iph.frag_off&htons(IP_DF))) printf(" nopmtudisc"); - if (!tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) { + if (p->iph.protocol == IPPROTO_IPV6 && !tnl_ioctl_get_6rd(p->name, &ip6rd) && ip6rd.prefixlen) { printf(" 6rd-prefix %s/%u ", inet_ntop(AF_INET6, &ip6rd.prefix, s1, sizeof(s1)), ip6rd.prefixlen); diff --git a/ip/tunnel.c b/ip/tunnel.c index d389e86..6efbd2d 100644 --- a/ip/tunnel.c +++ b/ip/tunnel.c @@ -26,6 +26,7 @@ #include #include #include +#include #include #include #include @@ -168,7 +169,7 @@ int tnl_del_ioctl(const char *basedev, const char *name, void *p) return err; } -static int tnl_gen_ioctl(int cmd, const char *name, void *p) +static int tnl_gen_ioctl(int cmd, const char *name, void *p, int skiperr) { struct ifreq ifr; int fd; @@ -178,7 +179,7 @@ static int tnl_gen_ioctl(int cmd, const char *name, void *p) ifr.ifr_ifru.ifru_data = p; fd = socket(preferred_family, SOCK_DGRAM, 0); err = ioctl(fd, cmd, &ifr); - if (err) + if (err && errno != skiperr) perror("ioctl"); close(fd); return err; @@ -186,15 +187,15 @@ static int tnl_gen_ioctl(int cmd, const char *name, void *p) int tnl_prl_ioctl(int cmd, const char *name, void *p) { - return tnl_gen_ioctl(cmd, name, p); + return tnl_gen_ioctl(cmd, name, p, -1); } int tnl_6rd_ioctl(int cmd, const char *name, void *p) { - return tnl_gen_ioctl(cmd, name, p); + return tnl_gen_ioctl(cmd, name, p, -1); } int tnl_ioctl_get_6rd(const char *name, void *p) { - return tnl_gen_ioctl(SIOCGET6RD, name, p); + return tnl_gen_ioctl(SIOCGET6RD, name, p, EINVAL); } -- 2.39.2