From 75425657fe3ad853b300976966d8fafa3f209b89 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Wed, 22 May 2019 12:07:43 -0700 Subject: [PATCH] net: Set strict_start_type for routes and rules New userspace on an older kernel can send unknown and unsupported attributes resulting in an incompelete config which is almost always wrong for routing (few exceptions are passthrough settings like the protocol that installed the route). Set strict_start_type in the policies for IPv4 and IPv6 routes and rules to detect new, unsupported attributes and fail the route add. Signed-off-by: David Ahern Signed-off-by: David S. Miller --- include/net/fib_rules.h | 1 + net/ipv4/fib_frontend.c | 1 + net/ipv6/route.c | 1 + 3 files changed, 3 insertions(+) diff --git a/include/net/fib_rules.h b/include/net/fib_rules.h index b473df5b9512..eba8465e1d86 100644 --- a/include/net/fib_rules.h +++ b/include/net/fib_rules.h @@ -103,6 +103,7 @@ struct fib_rule_notifier_info { }; #define FRA_GENERIC_POLICY \ + [FRA_UNSPEC] = { .strict_start_type = FRA_DPORT_RANGE + 1 }, \ [FRA_IIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ [FRA_OIFNAME] = { .type = NLA_STRING, .len = IFNAMSIZ - 1 }, \ [FRA_PRIORITY] = { .type = NLA_U32 }, \ diff --git a/net/ipv4/fib_frontend.c b/net/ipv4/fib_frontend.c index dfa57a84ac14..76055c66326a 100644 --- a/net/ipv4/fib_frontend.c +++ b/net/ipv4/fib_frontend.c @@ -645,6 +645,7 @@ int ip_rt_ioctl(struct net *net, unsigned int cmd, struct rtentry *rt) } const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = { + [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 }, [RTA_DST] = { .type = NLA_U32 }, [RTA_SRC] = { .type = NLA_U32 }, [RTA_IIF] = { .type = NLA_U32 }, diff --git a/net/ipv6/route.c b/net/ipv6/route.c index c52a7f49d096..5f0661c18624 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -4221,6 +4221,7 @@ void rt6_mtu_change(struct net_device *dev, unsigned int mtu) } static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = { + [RTA_UNSPEC] = { .strict_start_type = RTA_DPORT + 1 }, [RTA_GATEWAY] = { .len = sizeof(struct in6_addr) }, [RTA_PREFSRC] = { .len = sizeof(struct in6_addr) }, [RTA_OIF] = { .type = NLA_U32 },