On 28/09/2020 13:52, Pablo Neira Ayuso wrote:
On Mon, Sep 28, 2020 at 11:02:00AM +0000, ѽ҉ᶬḳ℠ wrote:
[...]
It seems that updating a set and dropping the packet in the same rules does
not work either, e.g.
ip protocol tcp update @glv4 { ip saddr limit rate over 50/second burst 15
packets } log prefix "foo " drop
would seem to only update the named set but is neither logging nor dropping
the frame.
This example is working fine here:
table ip x {
set glv4 {
typeof ip saddr
size 65535
flags dynamic,timeout
timeout 15m
}
chain y {
type filter hook output priority filter; policy accept;
ip protocol tcp update @glv4 { ip daddr limit rate over 1/minute burst 2 packets } log prefix "foo " drop
}
}
hping3 -S x.x.x.x -p 80 -c 1
HPING x.x.x.x (enp0s25 x.x.x.x): S set, 40 headers + 0 data bytes
len=46 ip=x.x.x.x ttl=53 DF id=0 sport=80 flags=SA seq=0 win=29200 rtt=31.8 ms
--- x.x.x.x hping statistic ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 31.8/31.8/31.8 ms
hping3 -S x.x.x.x -p 80 -c 1
HPING x.x.x.x (enp0s25 x.x.x.x): S set, 40 headers + 0 data bytes
[send_ip] sendto: Operation not permitted
[137712.162113] foo IN= OUT=enp0s25 SRC=10.141.1.219 DST=x.x.x.x LEN=40 TOS=0x00 PREC=0x00 TTL=64 ID=57787 PROTO=TCP SPT=2904 DPT=80 WINDOW=512 RES=0x00 SYN URGP=0
In the below example it does not print any logs and since that stanza is
right prior drop I reckon that since the log printing does not happen
the frame dropping does neither.
table inet filter {
set n_wan {
type ifname
flags constant
elements = { "eth2", "pppoe-wan" }
}
set glv4 {
type ipv4_addr
size 65535
flags dynamic,timeout
timeout 7d
gc-interval 10s
}
flowtable fte {
hook ingress priority -100
devices = { eth2 }
counter
}
flowtable ftw {
hook ingress priority -100
devices = { pppoe-wan }
counter
}
chain forward {
type filter hook forward priority filter; policy drop;
icmpv6 type echo-request accept
ct state established,related accept
iifname != @n_wan accept
tcp flags syn tcp option maxseg size set rt mtu
ip protocol { tcp, udp } flow add @fte
ip6 nexthdr { tcp, udp } flow add @fte
ip protocol { tcp, udp } flow add @ftw
ip6 nexthdr { tcp, udp } flow add @ftw
}
chain prerouting {
type filter hook prerouting priority mangle; policy accept;
iifname @n_wan goto wan_pr
}
chain wan_pr {
ct state { new } update @glv4 { ip saddr limit rate
over 15/day burst 3 packets } log prefix "glv4 DROP: " flags all drop
}
}
