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IPv6: reply ICMP error if the first fragment don't include all headers

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Based on RFC 8200, Section 4.5 Fragment Header:

  -  If the first fragment does not include all headers through an
     Upper-Layer header, then that fragment should be discarded and
     an ICMP Parameter Problem, Code 3, message should be sent to
     the source of the fragment, with the Pointer field set to zero.

Checking each packet header in IPv6 fast path will have performance impact,
so I put the checking in ipv6_frag_rcv().

As the packet may be any kind of L4 protocol, I only checked some common
protocols' header length and handle others by (offset + 1) > skb->len.
Also use !(frag_off & htons(IP6_OFFSET)) to catch atomic fragments
(fragmented packet with only one fragment).

When send ICMP error message, if the 1st truncated fragment is ICMP message,
icmp6_send() will break as is_ineligible() return true. So I added a check
in is_ineligible() to let fragment packet with nexthdr ICMP but no ICMP header
return false.

Signed-off-by: Hangbin Liu <liuhangbin@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Hangbin Liu 2020-10-27 20:33:13 +08:00 committed by Jakub Kicinski
parent b59e286be2
commit 2efdaaaf88
2 changed files with 39 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
net/ipv6/icmp.c
View File

@ -158,7 +158,13 @@ static bool is_ineligible(const struct sk_buff *skb)
tp = skb_header_pointer(skb,
ptr+offsetof(struct icmp6hdr, icmp6_type),
sizeof(_type), &_type);
if (!tp || !(*tp & ICMPV6_INFOMSG_MASK))
/* Based on RFC 8200, Section 4.5 Fragment Header, return
* false if this is a fragment packet with no icmp header info.
*/
if (!tp && frag_off != 0)
return false;
else if (!tp || !(*tp & ICMPV6_INFOMSG_MASK))
return true;
}
return false;

33
net/ipv6/reassembly.c
View File

@ -42,6 +42,8 @@
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/export.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <net/sock.h>
#include <net/snmp.h>
@ -322,7 +324,9 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
struct frag_queue *fq;
const struct ipv6hdr *hdr = ipv6_hdr(skb);
struct net *net = dev_net(skb_dst(skb)->dev);
int iif;
__be16 frag_off;
int iif, offset;
u8 nexthdr;
if (IP6CB(skb)->flags & IP6SKB_FRAGMENTED)
goto fail_hdr;
@ -351,6 +355,33 @@ static int ipv6_frag_rcv(struct sk_buff *skb)
return 1;
}
/* RFC 8200, Section 4.5 Fragment Header:
* If the first fragment does not include all headers through an
* Upper-Layer header, then that fragment should be discarded and
* an ICMP Parameter Problem, Code 3, message should be sent to
* the source of the fragment, with the Pointer field set to zero.
*/
nexthdr = hdr->nexthdr;
offset = ipv6_skip_exthdr(skb, skb_transport_offset(skb), &nexthdr, &frag_off);
if (offset >= 0) {
/* Check some common protocols' header */
if (nexthdr == IPPROTO_TCP)
offset += sizeof(struct tcphdr);
else if (nexthdr == IPPROTO_UDP)
offset += sizeof(struct udphdr);
else if (nexthdr == IPPROTO_ICMPV6)
offset += sizeof(struct icmp6hdr);
else
offset += 1;
if (!(frag_off & htons(IP6_OFFSET)) && offset > skb->len) {
__IP6_INC_STATS(net, __in6_dev_get_safely(skb->dev),
IPSTATS_MIB_INHDRERRORS);
icmpv6_param_prob(skb, ICMPV6_HDR_INCOMP, 0);
return -1;
}
}
iif = skb->dev ? skb->dev->ifindex : 0;
fq = fq_find(net, fhdr->identification, hdr, iif);
if (fq) {