diff options
| -rw-r--r-- | include/net/ip6_route.h | 5 | ||||
| -rw-r--r-- | net/ipv6/route.c | 5 |
2 files changed, 8 insertions, 2 deletions
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h index 2b786b7e358..a210b33fc8e 100644 --- a/include/net/ip6_route.h +++ b/include/net/ip6_route.h @@ -32,6 +32,11 @@ struct route_info { #define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010 #define RT6_LOOKUP_F_SRCPREF_COA 0x00000020 +/* We do not (yet ?) support IPv6 jumbograms (RFC 2675) + * Unlike IPv4, hdr->seg_len doesn't include the IPv6 header + */ +#define IP6_MAX_MTU (0xFFFF + sizeof(struct ipv6hdr)) + /* * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate * between IPV6_ADDR_PREFERENCES socket option values diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 77f81beabbd..b4bb6a29aa1 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1329,7 +1329,7 @@ static unsigned int ip6_mtu(const struct dst_entry *dst) unsigned int mtu = dst_metric_raw(dst, RTAX_MTU); if (mtu) - return mtu; + goto out; mtu = IPV6_MIN_MTU; @@ -1339,7 +1339,8 @@ static unsigned int ip6_mtu(const struct dst_entry *dst) mtu = idev->cnf.mtu6; rcu_read_unlock(); - return mtu; +out: + return min_t(unsigned int, mtu, IP6_MAX_MTU); } static struct dst_entry *icmp6_dst_gc_list; |