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net: ipv6: add skb drop reasons to ip6_rcv_core() 

Replace kfree_skb() used in ip6_rcv_core() with kfree_skb_reason().
No new drop reasons are added.

Seems now we use 'SKB_DROP_REASON_IP_INHDR' for too many case during
ipv6 header parse or check, just like what 'IPSTATS_MIB_INHDRERRORS'
do. Will it be too general and hard to know what happened?

Signed-off-by: Menglong Dong <imagedong@tencent.com>
Reviewed-by: Jiang Biao <benbjiang@tencent.com>
Reviewed-by: Hao Peng <flyingpeng@tencent.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Menglong Dong 2022-04-13 16:15:59 +08:00 committed by David S. Miller
parent 7d9dbdfbfd
commit 4daf841a2e
1 changed files with 16 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
net/ipv6/ip6_input.c
View File

@ -145,13 +145,14 @@ static void ip6_list_rcv_finish(struct net *net, struct sock *sk,
static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev,
struct net *net)
{
enum skb_drop_reason reason;
const struct ipv6hdr *hdr;
u32 pkt_len;
struct inet6_dev *idev;
if (skb->pkt_type == PACKET_OTHERHOST) {
dev_core_stats_rx_otherhost_dropped_inc(skb->dev);
kfree_skb(skb);
kfree_skb_reason(skb, SKB_DROP_REASON_OTHERHOST);
return NULL;
}
@ -161,9 +162,12 @@ static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev,
__IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_IN, skb->len);
SKB_DR_SET(reason, NOT_SPECIFIED);
if ((skb = skb_share_check(skb, GFP_ATOMIC)) == NULL ||
!idev || unlikely(idev->cnf.disable_ipv6)) {
__IP6_INC_STATS(net, idev, IPSTATS_MIB_INDISCARDS);
if (unlikely(idev->cnf.disable_ipv6))
SKB_DR_SET(reason, IPV6DISABLED);
goto drop;
}
@ -187,8 +191,10 @@ static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev,
hdr = ipv6_hdr(skb);
if (hdr->version != 6)
if (hdr->version != 6) {
SKB_DR_SET(reason, UNHANDLED_PROTO);
goto err;
}
__IP6_ADD_STATS(net, idev,
IPSTATS_MIB_NOECTPKTS +
@ -226,8 +232,10 @@ static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev,
if (!ipv6_addr_is_multicast(&hdr->daddr) &&
(skb->pkt_type == PACKET_BROADCAST ||
skb->pkt_type == PACKET_MULTICAST) &&
idev->cnf.drop_unicast_in_l2_multicast)
idev->cnf.drop_unicast_in_l2_multicast) {
SKB_DR_SET(reason, UNICAST_IN_L2_MULTICAST);
goto err;
}
/* RFC4291 2.7
* Nodes must not originate a packet to a multicast address whose scope
@ -256,12 +264,11 @@ static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev,
if (pkt_len + sizeof(struct ipv6hdr) > skb->len) {
__IP6_INC_STATS(net,
idev, IPSTATS_MIB_INTRUNCATEDPKTS);
SKB_DR_SET(reason, PKT_TOO_SMALL);
goto drop;
}
if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr))) {
__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
goto drop;
}
if (pskb_trim_rcsum(skb, pkt_len + sizeof(struct ipv6hdr)))
goto err;
hdr = ipv6_hdr(skb);
}
@ -282,9 +289,10 @@ static struct sk_buff *ip6_rcv_core(struct sk_buff *skb, struct net_device *dev,
return skb;
err:
__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
SKB_DR_OR(reason, IP_INHDR);
drop:
rcu_read_unlock();
kfree_skb(skb);
kfree_skb_reason(skb, reason);
return NULL;
}