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Message-ID: <20230216162842.1633734-3-edumazet@google.com>
Date: Thu, 16 Feb 2023 16:28:36 +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 2/8] ipv6: icmp6: add drop reason support to ndisc_recv_na()
Change ndisc_recv_na() to return a drop reason.
For the moment, return PKT_TOO_SMALL, NOT_SPECIFIED
or SKB_CONSUMED. More reasons are added later.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
net/ipv6/ndisc.c | 28 ++++++++++++++--------------
1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 039722f83c668ad59eb63ffde98e18ad8947bdcc..9354cb3669c814166fb3d07b32097f0b00ef42f8 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -987,7 +987,7 @@ static int accept_untracked_na(struct net_device *dev, struct in6_addr *saddr)
}
}
-static void ndisc_recv_na(struct sk_buff *skb)
+static enum skb_drop_reason ndisc_recv_na(struct sk_buff *skb)
{
struct nd_msg *msg = (struct nd_msg *)skb_transport_header(skb);
struct in6_addr *saddr = &ipv6_hdr(skb)->saddr;
@@ -1000,22 +1000,21 @@ static void ndisc_recv_na(struct sk_buff *skb)
struct inet6_dev *idev = __in6_dev_get(dev);
struct inet6_ifaddr *ifp;
struct neighbour *neigh;
+ SKB_DR(reason);
u8 new_state;
- if (skb->len < sizeof(struct nd_msg)) {
- ND_PRINTK(2, warn, "NA: packet too short\n");
- return;
- }
+ if (skb->len < sizeof(struct nd_msg))
+ return SKB_DROP_REASON_PKT_TOO_SMALL;
if (ipv6_addr_is_multicast(&msg->target)) {
ND_PRINTK(2, warn, "NA: target address is multicast\n");
- return;
+ return reason;
}
if (ipv6_addr_is_multicast(daddr) &&
msg->icmph.icmp6_solicited) {
ND_PRINTK(2, warn, "NA: solicited NA is multicasted\n");
- return;
+ return reason;
}
/* For some 802.11 wireless deployments (and possibly other networks),
@@ -1025,18 +1024,18 @@ static void ndisc_recv_na(struct sk_buff *skb)
*/
if (!msg->icmph.icmp6_solicited && idev &&
idev->cnf.drop_unsolicited_na)
- return;
+ return reason;
if (!ndisc_parse_options(dev, msg->opt, ndoptlen, &ndopts)) {
ND_PRINTK(2, warn, "NS: invalid ND option\n");
- return;
+ return reason;
}
if (ndopts.nd_opts_tgt_lladdr) {
lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr, dev);
if (!lladdr) {
ND_PRINTK(2, warn,
"NA: invalid link-layer address length\n");
- return;
+ return reason;
}
}
ifp = ipv6_get_ifaddr(dev_net(dev), &msg->target, dev, 1);
@@ -1044,7 +1043,7 @@ static void ndisc_recv_na(struct sk_buff *skb)
if (skb->pkt_type != PACKET_LOOPBACK
&& (ifp->flags & IFA_F_TENTATIVE)) {
addrconf_dad_failure(skb, ifp);
- return;
+ return reason;
}
/* What should we make now? The advertisement
is invalid, but ndisc specs say nothing
@@ -1060,7 +1059,7 @@ static void ndisc_recv_na(struct sk_buff *skb)
"NA: %pM advertised our address %pI6c on %s!\n",
eth_hdr(skb)->h_source, &ifp->addr, ifp->idev->dev->name);
in6_ifa_put(ifp);
- return;
+ return reason;
}
neigh = neigh_lookup(&nd_tbl, &msg->target, dev);
@@ -1121,10 +1120,11 @@ static void ndisc_recv_na(struct sk_buff *skb)
*/
rt6_clean_tohost(dev_net(dev), saddr);
}
-
+ reason = SKB_CONSUMED;
out:
neigh_release(neigh);
}
+ return reason;
}
static void ndisc_recv_rs(struct sk_buff *skb)
@@ -1840,7 +1840,7 @@ enum skb_drop_reason ndisc_rcv(struct sk_buff *skb)
break;
case NDISC_NEIGHBOUR_ADVERTISEMENT:
- ndisc_recv_na(skb);
+ reason = ndisc_recv_na(skb);
break;
case NDISC_ROUTER_SOLICITATION:
--
2.39.1.581.gbfd45094c4-goog
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