Fix the coredump of ovs_assert, The backtrace is as follows,
#8 0x0000561ee52084bb in ovs_assert_failure (where=<>, function=<>,
condition=<>) at ../lib/util.c:89
#9 0x0000561ee50f8ab2 in dp_packet_set_size (b=<>, v=<>) at
../lib/dp-packet.h:687
#10 dp_packet_set_size (v=<>, b=0x7f7f88143e80) at ../lib/dp-packet.h:687
#11 dp_packet_put_uninit (size=395, b=0x7f7f88143e80) at ../lib/dp-packet.c:355
#12 dp_packet_put (b=0x7f7f88143e80, p=0x7f7f88143ce2, size=395) at
../lib/dp-packet.c:376
#13 0x0000561ee512c147 in ipf_reassemble_v4_frags (ipf_list=0x7f7f88110810) at
../lib/ipf.c:430
The mbuf data_len is a uint16_t field, which includes the ether header.
So does IPv6.
Fixes: 4ea96698f667 ("Userspace datapath: Add fragmentation handling.")
Signed-off-by: Faicker Mo <[email protected]>
---
v2:
- Address comments from Mike:
- Better to get the packet length.
- Commit msg Fixes fixed.
- Add test case.
---
lib/ipf.c | 6 ++++--
tests/system-traffic.at | 12 ++++++++++--
2 files changed, 14 insertions(+), 4 deletions(-)
diff --git a/lib/ipf.c b/lib/ipf.c
index 59e232355..e994be928 100644
--- a/lib/ipf.c
+++ b/lib/ipf.c
@@ -410,11 +410,12 @@ ipf_reassemble_v4_frags(struct ipf_list *ipf_list)
dp_packet_set_size(pkt, dp_packet_size(pkt) - dp_packet_l2_pad_size(pkt));
struct ip_header *l3 = dp_packet_l3(pkt);
int len = ntohs(l3->ip_tot_len);
+ int orig_len = dp_packet_size(pkt);
int rest_len = frag_list[ipf_list->last_inuse_idx].end_data_byte -
frag_list[1].start_data_byte + 1;
- if (len + rest_len > IPV4_PACKET_MAX_SIZE) {
+ if (orig_len + rest_len > UINT16_MAX) {
ipf_print_reass_packet(
"Unsupported big reassembled v4 packet; v4 hdr:", l3);
dp_packet_delete(pkt);
@@ -459,11 +460,12 @@ ipf_reassemble_v6_frags(struct ipf_list *ipf_list)
dp_packet_set_size(pkt, dp_packet_size(pkt) - dp_packet_l2_pad_size(pkt));
struct ovs_16aligned_ip6_hdr *l3 = dp_packet_l3(pkt);
int pl = ntohs(l3->ip6_plen) - sizeof(struct ovs_16aligned_ip6_frag);
+ int orig_len = dp_packet_size(pkt);
int rest_len = frag_list[ipf_list->last_inuse_idx].end_data_byte -
frag_list[1].start_data_byte + 1;
- if (pl + rest_len > IPV6_PACKET_MAX_DATA) {
+ if (orig_len + rest_len > UINT16_MAX) {
ipf_print_reass_packet(
"Unsupported big reassembled v6 packet; v6 hdr:", l3);
dp_packet_delete(pkt);
diff --git a/tests/system-traffic.at b/tests/system-traffic.at
index 16de8da20..2ad9d15e4 100644
--- a/tests/system-traffic.at
+++ b/tests/system-traffic.at
@@ -4603,7 +4603,11 @@ NS_CHECK_EXEC([at_ns0], [ping -s 3200 -q -c 3 -i 0.3 -W
2 10.1.1.2 | FORMAT_PING
dnl Check userspace conntrack fragmentation counters.
DPCTL_CHECK_FRAGMENTATION_PASS()
-OVS_TRAFFIC_VSWITCHD_STOP
+dnl Ipv4 max packet size fragmentation dropped.
+NS_EXEC([at_ns0], [ping -s 65507 -q -c 1 -W 0.5 10.1.1.2])
+OVS_WAIT_UNTIL([grep -q 'Unsupported big reassembled v4 packet'
ovs-vswitchd.log])
+
+OVS_TRAFFIC_VSWITCHD_STOP(["/Unsupported big reassembled v4 packet/d"])
AT_CLEANUP
AT_SETUP([conntrack - IPv4 fragmentation expiry])
@@ -4897,7 +4901,11 @@ NS_CHECK_EXEC([at_ns0], [ping6 -s 3200 -q -c 3 -i 0.3 -W
2 fc00::2 | FORMAT_PING
3 packets transmitted, 3 received, 0% packet loss, time 0ms
])
-OVS_TRAFFIC_VSWITCHD_STOP
+dnl Ipv6 max packet size fragmentation dropped.
+NS_EXEC([at_ns0], [ping6 -s 65487 -q -c 1 -W 0.5 fc00::2])
+OVS_WAIT_UNTIL([grep -q 'Unsupported big reassembled v6 packet'
ovs-vswitchd.log])
+
+OVS_TRAFFIC_VSWITCHD_STOP(["/Unsupported big reassembled v6 packet/d"])
AT_CLEANUP
AT_SETUP([conntrack - IPv6 fragmentation expiry])
--
2.34.1
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