diff options
| author | Eric Dumazet <edumazet@google.com> | 2023-02-10 18:47:07 +0000 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2023-02-13 19:55:32 -0800 |
| commit | 30c89bad3ea2ef7a2d4686f9c3cc08420fe627bc (patch) | |
| tree | b3669633ac645d4dc9ad86bfed039b1596f440f0 /net/ipv6/icmp.c | |
| parent | 1fb2d41501f38192d8a19da585cd441cf8845697 (diff) | |
ipv6: icmp6: add drop reason support to icmpv6_notify()
Accurately reports what happened in icmpv6_notify() when handling
a packet.
This makes use of the new IPV6_BAD_EXTHDR drop reason.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv6/icmp.c')
| -rw-r--r-- | net/ipv6/icmp.c | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c index c9346515e24d..40bb5dedac09 100644 --- a/net/ipv6/icmp.c +++ b/net/ipv6/icmp.c @@ -813,16 +813,19 @@ out_bh_enable: local_bh_enable(); } -void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) +enum skb_drop_reason icmpv6_notify(struct sk_buff *skb, u8 type, + u8 code, __be32 info) { struct inet6_skb_parm *opt = IP6CB(skb); + struct net *net = dev_net(skb->dev); const struct inet6_protocol *ipprot; + enum skb_drop_reason reason; int inner_offset; __be16 frag_off; u8 nexthdr; - struct net *net = dev_net(skb->dev); - if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) + reason = pskb_may_pull_reason(skb, sizeof(struct ipv6hdr)); + if (reason != SKB_NOT_DROPPED_YET) goto out; seg6_icmp_srh(skb, opt); @@ -832,14 +835,17 @@ void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) /* now skip over extension headers */ inner_offset = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr, &frag_off); - if (inner_offset < 0) + if (inner_offset < 0) { + SKB_DR_SET(reason, IPV6_BAD_EXTHDR); goto out; + } } else { inner_offset = sizeof(struct ipv6hdr); } /* Checkin header including 8 bytes of inner protocol header. */ - if (!pskb_may_pull(skb, inner_offset+8)) + reason = pskb_may_pull_reason(skb, inner_offset + 8); + if (reason != SKB_NOT_DROPPED_YET) goto out; /* BUGGG_FUTURE: we should try to parse exthdrs in this packet. @@ -854,10 +860,11 @@ void icmpv6_notify(struct sk_buff *skb, u8 type, u8 code, __be32 info) ipprot->err_handler(skb, opt, type, code, inner_offset, info); raw6_icmp_error(skb, nexthdr, type, code, inner_offset, info); - return; + return SKB_CONSUMED; out: __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); + return reason; } /* @@ -953,7 +960,8 @@ static int icmpv6_rcv(struct sk_buff *skb) case ICMPV6_DEST_UNREACH: case ICMPV6_TIME_EXCEED: case ICMPV6_PARAMPROB: - icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); + reason = icmpv6_notify(skb, type, hdr->icmp6_code, + hdr->icmp6_mtu); break; case NDISC_ROUTER_SOLICITATION: @@ -995,7 +1003,8 @@ static int icmpv6_rcv(struct sk_buff *skb) * must pass to upper level */ - icmpv6_notify(skb, type, hdr->icmp6_code, hdr->icmp6_mtu); + reason = icmpv6_notify(skb, type, hdr->icmp6_code, + hdr->icmp6_mtu); } /* until the v6 path can be better sorted assume failure and |