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Message-ID: <20230216162842.1633734-5-edumazet@google.com>
Date: Thu, 16 Feb 2023 16:28:38 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org,
eric.dumazet@...il.com, Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 4/8] ipv6: icmp6: add drop reason support to ndisc_router_discovery()
Change ndisc_router_discovery() to return a drop reason.
For the moment, return PKT_TOO_SMALL, NOT_SPECIFIED
and SKB_CONSUMED.
More reasons are added later.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
net/ipv6/ndisc.c | 37 +++++++++++++++++++------------------
1 file changed, 19 insertions(+), 18 deletions(-)
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 514eb8cc78792445dedead3cf0b49df696ce2785..7c8ba308ea4979f46cb22d0132b559278b927a5f 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1231,20 +1231,21 @@ static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
rtnl_set_sk_err(net, RTNLGRP_ND_USEROPT, err);
}
-static void ndisc_router_discovery(struct sk_buff *skb)
+static enum skb_drop_reason ndisc_router_discovery(struct sk_buff *skb)
{
struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
+ bool send_ifinfo_notify = false;
struct neighbour *neigh = NULL;
- struct inet6_dev *in6_dev;
+ struct ndisc_options ndopts;
struct fib6_info *rt = NULL;
+ struct inet6_dev *in6_dev;
u32 defrtr_usr_metric;
+ unsigned int pref = 0;
+ __u32 old_if_flags;
struct net *net;
+ SKB_DR(reason);
int lifetime;
- struct ndisc_options ndopts;
int optlen;
- unsigned int pref = 0;
- __u32 old_if_flags;
- bool send_ifinfo_notify = false;
__u8 *opt = (__u8 *)(ra_msg + 1);
@@ -1256,17 +1257,15 @@ static void ndisc_router_discovery(struct sk_buff *skb)
__func__, skb->dev->name);
if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) {
ND_PRINTK(2, warn, "RA: source address is not link-local\n");
- return;
- }
- if (optlen < 0) {
- ND_PRINTK(2, warn, "RA: packet too short\n");
- return;
+ return reason;
}
+ if (optlen < 0)
+ return SKB_DROP_REASON_PKT_TOO_SMALL;
#ifdef CONFIG_IPV6_NDISC_NODETYPE
if (skb->ndisc_nodetype == NDISC_NODETYPE_HOST) {
ND_PRINTK(2, warn, "RA: from host or unauthorized router\n");
- return;
+ return reason;
}
#endif
@@ -1278,12 +1277,12 @@ static void ndisc_router_discovery(struct sk_buff *skb)
if (!in6_dev) {
ND_PRINTK(0, err, "RA: can't find inet6 device for %s\n",
skb->dev->name);
- return;
+ return reason;
}
if (!ndisc_parse_options(skb->dev, opt, optlen, &ndopts)) {
ND_PRINTK(2, warn, "RA: invalid ND options\n");
- return;
+ return reason;
}
if (!ipv6_accept_ra(in6_dev)) {
@@ -1365,7 +1364,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
"RA: %s got default router without neighbour\n",
__func__);
fib6_info_release(rt);
- return;
+ return reason;
}
}
/* Set default route metric as specified by user */
@@ -1390,7 +1389,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
ND_PRINTK(0, err,
"RA: %s failed to add default route\n",
__func__);
- return;
+ return reason;
}
neigh = ip6_neigh_lookup(&rt->fib6_nh->fib_nh_gw6,
@@ -1401,7 +1400,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
"RA: %s got default router without neighbour\n",
__func__);
fib6_info_release(rt);
- return;
+ return reason;
}
neigh->flags |= NTF_ROUTER;
} else if (rt && IPV6_EXTRACT_PREF(rt->fib6_flags) != pref) {
@@ -1488,6 +1487,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
NEIGH_UPDATE_F_ISROUTER,
NDISC_ROUTER_ADVERTISEMENT, &ndopts);
+ reason = SKB_CONSUMED;
}
if (!ipv6_accept_ra(in6_dev)) {
@@ -1598,6 +1598,7 @@ static void ndisc_router_discovery(struct sk_buff *skb)
fib6_info_release(rt);
if (neigh)
neigh_release(neigh);
+ return reason;
}
static void ndisc_redirect_rcv(struct sk_buff *skb)
@@ -1850,7 +1851,7 @@ enum skb_drop_reason ndisc_rcv(struct sk_buff *skb)
break;
case NDISC_ROUTER_ADVERTISEMENT:
- ndisc_router_discovery(skb);
+ reason = ndisc_router_discovery(skb);
break;
case NDISC_REDIRECT:
--
2.39.1.581.gbfd45094c4-goog
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