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2efdaaaf88
linux/net/ipv6
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Hangbin Liu 2efdaaaf88 IPv6: reply ICMP error if the first fragment don't include all headers 
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>
2020-10-31 13:16:02 -07:00
..
ila net: Add MODULE_DESCRIPTION entries to network modules 2020-06-20 21:33:57 -07:00
netfilter netfilter: Drop fragmented ndisc packets assembled in netfilter 2020-10-20 13:54:53 +02:00
addrconf_core.c ipv6: add ipv6_fragment hook in ipv6_stub 2020-08-31 12:26:39 -07:00
addrconf.c ipv6: some fixes for ipv6_dev_find() 2020-08-18 15:58:53 -07:00
addrlabel.c netlink: make validation more configurable for future strictness 2019-04-27 17:07:21 -04:00
af_inet6.c ipv6: add ipv6_fragment hook in ipv6_stub 2020-08-31 12:26:39 -07:00
ah6.c xfrm: add support for UDPv6 encapsulation of ESP 2020-04-28 11:28:36 +02:00
anycast.c ipv6: fix memory leaks on IPV6_ADDRFORM path 2020-07-30 16:30:55 -07:00
calipso.c net/ipv6: use semicolons rather than commas to separate statements 2020-10-13 17:11:52 -07:00
datagram.c icmp6: support rfc 4884 2020-07-24 17:12:41 -07:00
esp6_offload.c net: Add MODULE_DESCRIPTION entries to network modules 2020-06-20 21:33:57 -07:00
esp6.c xfrm: esp6: fix the location of the transport header with encapsulation 2020-07-28 07:57:23 +02:00
exthdrs_core.c ipv6: remove printk 2019-07-27 14:23:48 -07:00
exthdrs_offload.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
exthdrs.c net: ipv6: kerneldoc fixes 2020-07-13 17:20:39 -07:00
fib6_notifier.c net: fib_notifier: propagate extack down to the notifier block callback 2019-10-04 11:10:56 -07:00
fib6_rules.c fib: use indirect call wrappers in the most common fib_rules_ops 2020-07-28 17:42:31 -07:00
fou6.c net: Add MODULE_DESCRIPTION entries to network modules 2020-06-20 21:33:57 -07:00
icmp.c IPv6: reply ICMP error if the first fragment don't include all headers 2020-10-31 13:16:02 -07:00
inet6_connection_sock.c net: add bool confirm_neigh parameter for dst_ops.update_pmtu 2019-12-24 22:28:54 -08:00
inet6_hashtables.c net: ipv6: remove unused arg exact_dif in compute_score 2020-08-31 13:08:10 -07:00
ip6_checksum.c net: udp: fix handling of CHECKSUM_COMPLETE packets 2018-10-24 14:18:16 -07:00
ip6_fib.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-10-15 12:43:21 -07:00
ip6_flowlabel.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-08-05 20:13:21 -07:00
ip6_gre.c ip6gre: avoid tx_error when sending MLD/DAD on external tunnels 2020-09-28 16:01:37 -07:00
ip6_icmp.c ipv6: icmp6: avoid indirect call for icmpv6_send() 2020-06-19 13:41:59 -07:00
ip6_input.c bpf: Add socket assign support 2020-03-30 13:45:04 -07:00
ip6_offload.c udp: move gro declarations to net/udp.h 2020-06-23 20:10:15 -07:00
ip6_offload.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
ip6_output.c networking changes for the 5.10 merge window 2020-10-15 18:42:13 -07:00
ip6_tunnel.c ip6_tunnel: set inner ipproto before ip6_tnl_encap 2020-10-30 08:07:30 -07:00
ip6_udp_tunnel.c net: Make locking in sock_bindtoindex optional 2020-06-01 14:57:14 -07:00
ip6_vti.c ipv6: use dev_sw_netstats_rx_add() 2020-10-06 06:23:21 -07:00
ip6mr.c net/ipv6: switch ip6_mroute_setsockopt to sockptr_t 2020-07-24 15:41:54 -07:00
ipcomp6.c ipcomp: assign if_id to child tunnel from parent tunnel 2020-07-09 12:55:37 +02:00
ipv6_sockglue.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
Kconfig net: ipv6: fix kconfig dependency warning for IPV6_SEG6_HMAC 2020-09-18 17:45:04 -07:00
Makefile net: ipv6: add rpl sr tunnel 2020-03-29 22:30:57 -07:00
mcast_snoop.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 343 2019-06-05 17:37:07 +02:00
mcast.c mld: fix memory leak in ipv6_mc_destroy_dev() 2020-06-15 13:29:39 -07:00
mip6.c xfrm: remove type and offload_type map from xfrm_state_afinfo 2019-06-06 08:34:50 +02:00
ndisc.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2020-05-01 17:02:27 -07:00
netfilter.c netfilter: avoid ipv6 -> nf_defrag_ipv6 module dependency 2020-08-13 04:16:15 +02:00
output_core.c treewide: Add SPDX license identifier for missed files 2019-05-21 10:50:45 +02:00
ping.c ipv6/ping: set skb->mark on icmpv6 sockets 2020-07-03 14:36:04 -07:00
proc.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-06-07 11:00:14 -07:00
protocol.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
raw.c csum_partial_copy_nocheck(): drop the last argument 2020-08-20 15:45:14 -04:00
reassembly.c IPv6: reply ICMP error if the first fragment don't include all headers 2020-10-31 13:16:02 -07:00
route.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-10-15 12:43:21 -07:00
rpl_iptunnel.c net: ipv6: Use struct_size() helper and kcalloc() 2020-06-23 20:27:09 -07:00
rpl.c ipv6: rpl: fix full address compression 2020-04-18 15:04:27 -07:00
seg6_hmac.c crypto: lib/sha1 - remove unnecessary includes of linux/cryptohash.h 2020-05-08 15:32:17 +10:00
seg6_iptunnel.c seg6_iptunnel: Refactor seg6_lwt_headroom out of uapi header 2020-08-03 17:57:40 -07:00
seg6_local.c seg6: fix seg6_validate_srh() to avoid slab-out-of-bounds 2020-06-04 15:39:32 -07:00
seg6.c seg6: fix seg6_validate_srh() to avoid slab-out-of-bounds 2020-06-04 15:39:32 -07:00
sit.c net: sit: implement header_ops->parse_protocol for AF_PACKET 2020-06-30 12:29:39 -07:00
syncookies.c tcp: syncookies: create mptcp request socket for ACK cookies with MPTCP option 2020-07-31 16:55:32 -07:00
sysctl_net_ipv6.c ipv6: Fix sysctl max for fib_multipath_hash_policy 2020-09-02 15:44:53 -07:00
tcp_ipv6.c net: ipv6: delete duplicated words 2020-09-18 14:12:43 -07:00
tcpv6_offload.c treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152 2019-05-30 11:26:32 -07:00
tunnel6.c tunnel6: add tunnel6_input_afinfo for ipip and ipv6 tunnels 2020-07-09 12:52:37 +02:00
udp_impl.h net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
udp_offload.c udp: Support UDP fraglist GRO/GSO. 2020-01-27 11:00:21 +01:00
udp.c udp, bpf: Ignore connections in reuseport group after BPF sk lookup 2020-07-31 02:00:48 +02:00
udplite.c net/ipv6: remove compat_ipv6_{get,set}sockopt 2020-07-19 18:16:41 -07:00
xfrm6_input.c xfrm: state: remove extract_input indirection from xfrm_state_afinfo 2020-05-06 09:40:08 +02:00
xfrm6_output.c xfrm: remove output_finish indirection from xfrm_state_afinfo 2020-05-06 09:40:08 +02:00
xfrm6_policy.c net: add bool confirm_neigh parameter for dst_ops.update_pmtu 2019-12-24 22:28:54 -08:00
xfrm6_protocol.c xfrm: add support for UDPv6 encapsulation of ESP 2020-04-28 11:28:36 +02:00
xfrm6_state.c xfrm: remove output_finish indirection from xfrm_state_afinfo 2020-05-06 09:40:08 +02:00
xfrm6_tunnel.c ipv6: xfrm6_tunnel.c: Use built-in RCU list checking 2020-02-27 10:17:41 +01:00