- 25 Sep, 2016 3 commits
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Liping Zhang authored
Currently, if the user want to match ct l3proto, we must specify the direction, for example: # nft add rule filter input ct original l3proto ipv4 ^^^^^^^^ Otherwise, error message will be reported: # nft add rule filter input ct l3proto ipv4 nft add rule filter input ct l3proto ipv4 <cmdline>:1:1-38: Error: Could not process rule: Invalid argument add rule filter input ct l3proto ipv4 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Actually, there's no need to require NFTA_CT_DIRECTION attr, because ct l3proto and protocol are unrelated to direction. And for compatibility, even if the user specify the NFTA_CT_DIRECTION attr, do not report error, just skip it. Signed-off-by:Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by:
Pablo Neira Ayuso <pablo@netfilter.org>
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Gao Feng authored
It is valid that the TCP RST packet which does not set ack flag, and bytes of ack number are zero. But current seqadj codes would adjust the "0" ack to invalid ack number. Actually seqadj need to check the ack flag before adjust it for these RST packets. The following is my test case client is 10.26.98.245, and add one iptable rule: iptables -I INPUT -p tcp --sport 12345 -m connbytes --connbytes 2: --connbytes-dir reply --connbytes-mode packets -j REJECT --reject-with tcp-reset This iptables rule could generate on TCP RST without ack flag. server:10.172.135.55 Enable the synproxy with seqadjust by the following iptables rules iptables -t raw -A PREROUTING -i eth0 -p tcp -d 10.172.135.55 --dport 12345 -m tcp --syn -j CT --notrack iptables -A INPUT -i eth0 -p tcp -d 10.172.135.55 --dport 12345 -m conntrack --ctstate INVALID,UNTRACKED -j SYNPROXY --sack-perm --timestamp --wscale 7 --mss 1460 iptables -A OUTPUT -o eth0 -p tcp -s 10.172.135.55 --sport 12345 -m conntrack --ctstate INVALID,UNTRACKED -m tcp --tcp-flags SYN,RST,ACK SYN,ACK -j ACCEPT The following is my test result. 1. packet trace on client root@routers:/tmp# tcpdump -i eth0 tcp port 12345 -n tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes IP 10.26.98.245.45154 > 10.172.135.55.12345: Flags [S], seq 3695959829, win 29200, options [mss 1460,sackOK,TS val 452367884 ecr 0,nop,wscale 7], length 0 IP 10.172.135.55.12345 > 10.26.98.245.45154: Flags [S.], seq 546723266, ack 3695959830, win 0, options [mss 1460,sackOK,TS val 15643479 ecr 452367884, nop,wscale 7], length 0 IP 10.26.98.245.45154 > 10.172.135.55.12345: Flags [.], ack 1, win 229, options [nop,nop,TS val 452367885 ecr 15643479], length 0 IP 10.172.135.55.12345 > 10.26.98.245.45154: Flags [.], ack 1, win 226, options [nop,nop,TS val 15643479 ecr 452367885], length 0 IP 10.26.98.245.45154 > 10.172.135.55.12345: Flags [R], seq 3695959830, win 0, length 0 2. seqadj log on server [62873.867319] Adjusting sequence number from 602341895->546723267, ack from 3695959830->3695959830 [62873.867644] Adjusting sequence number from 602341895->546723267, ack from 3695959830->3695959830 [62873.869040] Adjusting sequence number from 3695959830->3695959830, ack from 0->55618628 To summarize, it is clear that the seqadj codes adjust the 0 ack when receive one TCP RST packet without ack. Signed-off-by:
Gao Feng <fgao@ikuai8.com> Signed-off-by:
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Aaron Conole authored
The netfilter hook list never uses the prev pointer, and so can be trimmed to be a simple singly-linked list. In addition to having a more light weight structure for hook traversal, struct net becomes 5568 bytes (down from 6400) and struct net_device becomes 2176 bytes (down from 2240). Signed-off-by:
Aaron Conole <aconole@bytheb.org> Signed-off-by:
Florian Westphal <fw@strlen.de> Signed-off-by:
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- 24 Sep, 2016 7 commits
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Aaron Conole authored
A future patch will modify the hook drop and outfn functions. This will cause the line lengths to take up too much space. This is simply a readability change. Signed-off-by:
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Aaron Conole authored
This commit adds an upfront check for sane values to be passed when registering a netfilter hook. This will be used in a future patch for a simplified hook list traversal. Signed-off-by:
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Aaron Conole authored
All of the callers of nf_hook_slow already hold the rcu_read_lock, so this cleanup removes the recursive call. This is just a cleanup, as the locking code gracefully handles this situation. Signed-off-by:
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Aaron Conole authored
This commit ensures that the rcu read-side lock is held while the ingress hook is called. This ensures that a call to nf_hook_slow (and ultimately nf_ingress) will be read protected. Signed-off-by:
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Florian Westphal authored
This makes things simpler because we can store the head of the list in the nf_state structure without worrying about concurrent add/delete of hook elements from the list. A future commit will make use of this to implement a simpler linked-list. Signed-off-by:
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Florian Westphal authored
This replaces the last uses of NF_HOOK_THRESH(). Followup patch will remove it and rename nf_hook_thresh. The reason is that inet (non-bridge) netfilter no longer invokes the hooks from hooks, so we do no longer need the thresh value to skip hooks with a lower priority. The bridge netfilter however may need to do this. br_nf_hook_thresh is a wrapper that is supposed to do this, i.e. only call hooks with a priority that exceeds NF_BR_PRI_BRNF. It's used only in the recursion cases of br_netfilter. It invokes nf_hook_slow while holding an rcu read-side critical section to make a future cleanup simpler. Signed-off-by:
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Gao Feng authored
The origin codes perform two condition checks with dst_mtu(skb_dst(skb)) and in_mtu. And the last statement is "min(dst_mtu(skb_dst(skb)), in_mtu) - minlen". It may let reader think about how about the result. Would it be negative. Now assign the result of min(dst_mtu(skb_dst(skb)), in_mtu) to a new variable, then only perform one condition check, and it is more readable. Signed-off-by:
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- 23 Sep, 2016 8 commits
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Pablo Neira Ayuso authored
We already checked for !found just a bit before: if (!found) { regs->verdict.code = NFT_BREAK; return; } if (found && set->flags & NFT_SET_MAP) ^^^^^ So this redundant check can just go away. Signed-off-by: -
Gao Feng authored
It's better to use sizeof(info->name)-1 as index to force set the string tail instead of literal number '29'. Signed-off-by:
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Gao Feng authored
There are some codes which are used to get one random once in netfilter. We could use net_get_random_once to simplify these codes. Signed-off-by:
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Liping Zhang authored
pkt->xt.thoff is not always set properly, but we use it without any check. For payload expr, it will cause wrong results. For nftrace, we may notify the wrong network or transport header to the user space, furthermore, input the following nft rules, warning message will be printed out: # nft add rule arp filter output meta nftrace set 1 WARNING: CPU: 0 PID: 13428 at net/netfilter/nf_tables_trace.c:263 nft_trace_notify+0x4a3/0x5e0 [nf_tables] Call Trace: [<ffffffff813d58ae>] dump_stack+0x63/0x85 [<ffffffff810a4c0b>] __warn+0xcb/0xf0 [<ffffffff810a4d3d>] warn_slowpath_null+0x1d/0x20 [<ffffffffa0589703>] nft_trace_notify+0x4a3/0x5e0 [nf_tables] [ ... ] [<ffffffffa05690a8>] nft_do_chain_arp+0x78/0x90 [nf_tables_arp] [<ffffffff816f4aa2>] nf_iterate+0x62/0x80 [<ffffffff816f4b33>] nf_hook_slow+0x73/0xd0 [<ffffffff81732bbf>] arp_xmit+0x8f/0xb0 [ ... ] [<ffffffff81732d36>] arp_solicit+0x106/0x2c0 So before we use pkt->xt.thoff, check the tprot_set first. Signed-off-by:
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Liping Zhang authored
There's an off-by-one issue in nft_payload_fast_eval, skb_tail_pointer and ptr + priv->len all point to the last valid address plus 1. So if they are equal, we can still fetch the valid data. It's unnecessary to fall back to nft_payload_eval. Signed-off-by:
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Liping Zhang authored
After commit ac286344 ("netfilter: bridge: add nf_afinfo to enable queuing to userspace"), we can queue packets to the user space in bridge family. But when the user specify the queue range, packets will be only delivered to the first queue num. Because in nfqueue_hash, we only support ipv4 and ipv6 family. Now add support for bridge family too. Suggested-by:
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Liping Zhang authored
Currently, the user can specify the queue numbers by _QUEUE_NUM and _QUEUE_TOTAL attributes, this is enough in most situations. But acctually, it is not very flexible, for example: tcp dport 80 mapped to queue0 tcp dport 81 mapped to queue1 tcp dport 82 mapped to queue2 In order to do this thing, we must add 3 nft rules, and more mapping meant more rules ... So take one register to select the queue number, then we can add one simple rule to mapping queues, maybe like this: queue num tcp dport map { 80:0, 81:1, 82:2 ... } Florian Westphal also proposed wider usage scenarios: queue num jhash ip saddr . ip daddr mod ... queue num meta cpu ... queue num meta mark ... The last point is how to load a queue number from sreg, although we can use *(u16*)®s->data[reg] to load the queue number, just like nat expr to load its l4port do. But we will cooperate with hash expr, meta cpu, meta mark expr and so on. They all store the result to u32 type, so cast it to u16 pointer and dereference it will generate wrong result in the big endian system. So just keep it simple, we treat queue number as u32 type, although u16 type is already enough. Suggested-by: -
Laura Garcia Liebana authored
Fetch value and validate u32 netlink attribute. This validation is usually required when the u32 netlink attributes are being stored in a field whose size is smaller. This patch revisits 4da449ae ("netfilter: nft_exthdr: Add size check on u8 nft_exthdr attributes"). Fixes: 96518518 ("netfilter: add nftables") Suggested-by:
Laura Garcia Liebana <nevola@gmail.com> Signed-off-by:
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- 22 Sep, 2016 1 commit
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Laura Garcia Liebana authored
Add support of an offset value for incremental counter and random. With this option the sysadmin is able to start the counter to a certain value and then apply the generated number. Example: meta mark set numgen inc mod 2 offset 100 This will generate marks with the serie 100, 101, 100, 101, ... Suggested-by:
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- 13 Sep, 2016 1 commit
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Laura Garcia Liebana authored
The overflow validation in the init() function establishes that the maximum value that the hash could reach is less than U32_MAX, which is likely to be true. The fix detects the overflow when the maximum hash value is less than the offset itself. Fixes: 70ca767e ("netfilter: nft_hash: Add hash offset value") Reported-by:
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- 12 Sep, 2016 13 commits
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Liping Zhang authored
After we generate a new number, we still use the priv->counter and store it to the dreg. This is not correct, another cpu may already change it to a new number. So we must use the generated number, not the priv->counter itself. Fixes: 91dbc6be ("netfilter: nf_tables: add number generator expression") Signed-off-by:
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Florian Westphal authored
These counters sit in hot path and do show up in perf, this is especially true for 'found' and 'searched' which get incremented for every packet processed. Information like searched=212030105 new=623431 found=333613 delete=623327 does not seem too helpful nowadays: - on busy systems found and searched will overflow every few hours (these are 32bit integers), other more busy ones every few days. - for debugging there are better methods, such as iptables' trace target, the conntrack log sysctls. Nowadays we also have perf tool. This removes packet path stat counters except those that are expected to be 0 (or close to 0) on a normal system, e.g. 'insert_failed' (race happened) or 'invalid' (proto tracker rejects). The insert stat is retained for the ctnetlink case. The found stat is retained for the tuple-is-taken check when NAT has to determine if it needs to pick a different source address. Signed-off-by:
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Liping Zhang authored
hash_v6 is used by both nftables and ip6tables, so depend on IP6_NF_IPTABLES is not properly. Actually, it only parses ipv6hdr and computes a hash value, so even if IPV6 is disabled, there's no side effect too, remove it. Signed-off-by:
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Gao Feng authored
There are some codes of netfilter module which did not check the return value of nft_register_chain_type. Add the checks now. Signed-off-by:
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Gao Feng authored
There are some codes of netfilter module which did not check the return value of register_netdevice_notifier. Add the checks now. Signed-off-by:
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Pablo Neira authored
Instead of several goto's just to return the result, simply return it. Signed-off-by: -
Pablo Neira Ayuso authored
This is overly conservative and not flexible at all, so better let them go through and let the filtering policy decide what to do with them. We use skb_header_pointer() all over the place so we would just fail to match when trying to access fields from malformed traffic. Signed-off-by: -
Pablo Neira Ayuso authored
Consolidate pktinfo setup and validation by using the new generic functions so we converge to the netdev family codebase. We only need a linear IPv4 and IPv6 header from the reject expression, so move nft_bridge_iphdr_validate() and nft_bridge_ip6hdr_validate() to net/bridge/netfilter/nft_reject_bridge.c. Signed-off-by: -
Pablo Neira Ayuso authored
These functions are extracted from the netdev family, they initialize the pktinfo structure and validate that the IPv4 and IPv6 headers are well-formed given that these functions are called from a path where layer 3 sanitization did not happen yet. These functions are placed in include/net/netfilter/nf_tables_ipv{4,6}.h so they can be reused by a follow up patch to use them from the bridge family too. Signed-off-by: -
Pablo Neira Ayuso authored
Make sure the pktinfo protocol fields are initialized if this fails to parse the transport header. Signed-off-by: -
Pablo Neira Ayuso authored
This patch introduces nft_set_pktinfo_unspec() that ensures proper initialization all of pktinfo fields for non-IP traffic. This is used by the bridge, netdev and arp families. This new function relies on nft_set_pktinfo_proto_unspec() to set a new tprot_set field that indicates if transport protocol information is available. Remain fields are zeroed. The meta expression has been also updated to check to tprot_set in first place given that zero is a valid tprot value. Even a handcrafted packet may come with the IPPROTO_RAW (255) protocol number so we can't rely on this value as tprot unset. Reported-by:
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Pablo Neira Ayuso authored
The dynset expression matches if we can fit a new entry into the set. If there is no room for it, then it breaks the rule evaluation. This patch introduces the inversion flag so you can add rules to explicitly drop packets that don't fit into the set. For example: # nft filter input flow table xyz size 4 { ip saddr timeout 120s counter } overflow drop This is useful to provide a replacement for connlimit. For the rule above, every new entry uses the IPv4 address as key in the set, this entry gets a timeout of 120 seconds that gets refresh on every packet seen. If we get new flow and our set already contains 4 entries already, then this packet is dropped. You can already express this in positive logic, assuming default policy to drop: # nft filter input flow table xyz size 4 { ip saddr timeout 10s counter } accept Signed-off-by: -
Laura Garcia Liebana authored
Add support to pass through an offset to the hash value. With this feature, the sysadmin is able to generate a hash with a given offset value. Example: meta mark set jhash ip saddr mod 2 seed 0xabcd offset 100 This option generates marks according to the source address from 100 to 101. Signed-off-by:
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- 09 Sep, 2016 2 commits
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Liping Zhang authored
After commit adf05168 ("netfilter: remove ip_conntrack* sysctl compat code"), ctl_table_path member in struct nf_conntrack_l3proto{} is not used anymore, remove it. Signed-off-by:
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Liping Zhang authored
Although the validation of queues_total and queuenum is checked in nft utility, but user can add nft rules via nfnetlink, so it is necessary to check the validation at the nft_queue expr init routine too. Tested by run ./nft-test.py any/queue.t: any/queue.t: 6 unit tests, 0 error, 0 warning Signed-off-by:
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- 07 Sep, 2016 5 commits
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Marco Angaroni authored
Current parsing methods for SIP headers do not allow the presence of tab characters between header name and header value. As a result Call-ID SIP headers like the following are discarded by IPVS SIP persistence engine: "Call-ID\t: mycallid@abcde" "Call-ID:\tmycallid@abcde" In above examples Call-IDs are represented as strings in C language. Obviously in real message we have byte "09" before/after colon (":"). Proposed fix is in nf_conntrack_sip module. Function sip_skip_whitespace() should skip tabs in addition to spaces, since in SIP grammar whitespace (WSP) corresponds to space or tab. Below is an extract of relevant SIP ABNF syntax. Call-ID = ( "Call-ID" / "i" ) HCOLON callid callid = word [ "@" word ] HCOLON = *( SP / HTAB ) ":" SWS SWS = [LWS] ; sep whitespace LWS = [*WSP CRLF] 1*WSP ; linear whitespace WSP = SP / HTAB word = 1*(alphanum / "-" / "." / "!" / "%" / "*" / "_" / "+" / "`" / "'" / "~" / "(" / ")" / "<" / ">" / ":" / "\" / DQUOTE / "/" / "[" / "]" / "?" / "{" / "}" ) Signed-off-by:Marco Angaroni <marcoangaroni@gmail.com> Signed-off-by:
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Pablo Neira Ayuso authored
This is patch renames the existing function to nft_overquota() and make it return a boolean that tells us if we have exceeded our byte quota. Just a cleanup. Signed-off-by: -
Pablo Neira Ayuso authored
Use xor to decide to break further rule evaluation or not, since the existing logic doesn't achieve the expected inversion. Signed-off-by: -
Laura Garcia Liebana authored
The _until_ attribute is renamed to _modulus_ as the behaviour is similar to other expresions with number limits (ex. nft_hash). Renaming is possible because there isn't a kernel release yet with these changes. Signed-off-by:
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Gao Feng authored
There are some debug code which are commented out in find_pattern by #if 0. Now remove them. Signed-off-by:
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