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* Re: [LARTC] Shaping traffic to local users ?
From: Patrick McHardy @ 2002-12-19 16:03 UTC (permalink / raw)
  To: lartc
In-Reply-To: <marc-lartc-104030478706921@msgid-missing>

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Hi Dimitris,

You could try this patch to the owner match. Its working fine for me, 
but i've seen it crash for unknown reasons
on other boxes. anyway its not very important to me so i won't try to 
fix it, but if you're brave you could give
it a shot ;)

Bye,
Patrick

Dimitris Kotsonis wrote:

>     
>     Hello
>     
>     Is it possible to shape incoming traffic for local linux users ?
>
>     Iptables can mark packets created from certain pid/uid/gid. Is 
> there a way to do the same for packets _destined_ for some pid/uid/gid 
> so that I can later shape them with IMQ ?
>
>     
>     Thanks in advance
>
>     Dimitris Kotsonis
>
>
>
>     
>
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/



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diff -urN patch-o-matic-clean/extra/owner-socketlookup.patch patch-o-matic/extra/owner-socketlookup.patch

--- patch-o-matic-clean/extra/owner-socketlookup.patch	1970-01-01 01:00:00.000000000 +0100
+++ patch-o-matic/extra/owner-socketlookup.patch	2002-08-30 01:38:02.000000000 +0200
@@ -0,0 +1,182 @@
+diff -urN ../kernel/linux-2.4.20-pre4/include/net/tcp.h linux-2.4.20-pre4/include/net/tcp.h
+--- ../kernel/linux-2.4.20-pre4/include/net/tcp.h	2002-08-29 01:56:12.000000000 +0200
++++ linux-2.4.20-pre4/include/net/tcp.h	2002-08-30 00:16:56.000000000 +0200
+@@ -140,6 +140,7 @@
+ extern void tcp_bucket_unlock(struct sock *sk);
+ extern int tcp_port_rover;
+ extern struct sock *tcp_v4_lookup_listener(u32 addr, unsigned short hnum, int dif);
++extern struct sock *tcp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 hnum, int dif);
+ 
+ /* These are AF independent. */
+ static __inline__ int tcp_bhashfn(__u16 lport)
+diff -urN ../kernel/linux-2.4.20-pre4/include/net/udp.h linux-2.4.20-pre4/include/net/udp.h
+--- ../kernel/linux-2.4.20-pre4/include/net/udp.h	2001-11-22 20:47:15.000000000 +0100
++++ linux-2.4.20-pre4/include/net/udp.h	2002-08-30 00:22:24.000000000 +0200
+@@ -69,6 +69,8 @@
+ extern int	udp_ioctl(struct sock *sk, int cmd, unsigned long arg);
+ extern int	udp_disconnect(struct sock *sk, int flags);
+ 
++extern struct sock *udp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 dport, int dif);
++
+ extern struct udp_mib udp_statistics[NR_CPUS*2];
+ #define UDP_INC_STATS(field)		SNMP_INC_STATS(udp_statistics, field)
+ #define UDP_INC_STATS_BH(field)		SNMP_INC_STATS_BH(udp_statistics, field)
+diff -urN ../kernel/linux-2.4.20-pre4/net/ipv4/netfilter/ipt_owner.c linux-2.4.20-pre4/net/ipv4/netfilter/ipt_owner.c
+--- ../kernel/linux-2.4.20-pre4/net/ipv4/netfilter/ipt_owner.c	2002-08-29 01:56:13.000000000 +0200
++++ linux-2.4.20-pre4/net/ipv4/netfilter/ipt_owner.c	2002-08-28 22:19:39.000000000 +0200
+@@ -2,17 +2,26 @@
+    locally generated outgoing packets.
+ 
+    Copyright (C) 2000 Marc Boucher
++
++   08/28/2002 Patrick McHardy <kaber@trash.net> 
++   		- Modified to also match properties of receiving sockets
+  */
+ #include <linux/module.h>
+ #include <linux/skbuff.h>
+ #include <linux/file.h>
++#include <linux/ip.h>
++#include <linux/tcp.h>
++#include <linux/udp.h>
+ #include <net/sock.h>
++#include <net/tcp.h>
++#include <net/udp.h>
++#include <net/route.h>
+ 
+ #include <linux/netfilter_ipv4/ipt_owner.h>
+ #include <linux/netfilter_ipv4/ip_tables.h>
+ 
+ static int
+-match_comm(const struct sk_buff *skb, const char *comm)
++match_comm(const struct sock *sk, const char *comm)
+ {
+ 	struct task_struct *p;
+ 	struct files_struct *files;
+@@ -28,7 +38,7 @@
+ 		if(files) {
+ 			read_lock(&files->file_lock);
+ 			for (i=0; i < files->max_fds; i++) {
+-				if (fcheck_files(files, i) == skb->sk->socket->file) {
++				if (fcheck_files(files, i) == sk->socket->file) {
+ 					read_unlock(&files->file_lock);
+ 					task_unlock(p);
+ 					read_unlock(&tasklist_lock);
+@@ -44,7 +54,7 @@
+ }
+ 
+ static int
+-match_pid(const struct sk_buff *skb, pid_t pid)
++match_pid(const struct sock *sk, pid_t pid)
+ {
+ 	struct task_struct *p;
+ 	struct files_struct *files;
+@@ -59,7 +69,7 @@
+ 	if(files) {
+ 		read_lock(&files->file_lock);
+ 		for (i=0; i < files->max_fds; i++) {
+-			if (fcheck_files(files, i) == skb->sk->socket->file) {
++			if (fcheck_files(files, i) == sk->socket->file) {
+ 				read_unlock(&files->file_lock);
+ 				task_unlock(p);
+ 				read_unlock(&tasklist_lock);
+@@ -75,10 +85,10 @@
+ }
+ 
+ static int
+-match_sid(const struct sk_buff *skb, pid_t sid)
++match_sid(const struct sock *sk, pid_t sid)
+ {
+ 	struct task_struct *p;
+-	struct file *file = skb->sk->socket->file;
++	struct file *file = sk->socket->file;
+ 	int i, found=0;
+ 
+ 	read_lock(&tasklist_lock);
+@@ -119,36 +129,55 @@
+       int *hotdrop)
+ {
+ 	const struct ipt_owner_info *info = matchinfo;
++	struct sock *sk = NULL;
+ 
+-	if (!skb->sk || !skb->sk->socket || !skb->sk->socket->file)
++	if (out) {
++		sk = skb->sk;
++	} else {
++		struct iphdr *iph = skb->nh.iph;
++		if (iph->protocol == IPPROTO_TCP) {
++			struct tcphdr *tcph =
++				(struct tcphdr*)((u_int32_t*)iph + iph->ihl);
++			sk = tcp_v4_lookup(iph->saddr, tcph->source,
++					   iph->daddr, tcph->dest,
++					   ((struct rtable*)skb->dst)->rt_iif);
++		} else if (iph->protocol == IPPROTO_UDP) {
++			struct udphdr *udph =
++				(struct udphdr*)((u_int32_t*)iph + iph->ihl);
++			sk = udp_v4_lookup(iph->daddr, udph->dest, iph->saddr,
++					   udph->source, skb->dev->ifindex);
++		}
++	} 
++					
++	if (!sk || !sk->socket || !sk->socket->file)
+ 		return 0;
+ 
+ 	if(info->match & IPT_OWNER_UID) {
+-		if((skb->sk->socket->file->f_uid != info->uid) ^
++		if((sk->socket->file->f_uid != info->uid) ^
+ 		    !!(info->invert & IPT_OWNER_UID))
+ 			return 0;
+ 	}
+ 
+ 	if(info->match & IPT_OWNER_GID) {
+-		if((skb->sk->socket->file->f_gid != info->gid) ^
++		if((sk->socket->file->f_gid != info->gid) ^
+ 		    !!(info->invert & IPT_OWNER_GID))
+ 			return 0;
+ 	}
+ 
+ 	if(info->match & IPT_OWNER_PID) {
+-		if (!match_pid(skb, info->pid) ^
++		if (!match_pid(sk, info->pid) ^
+ 		    !!(info->invert & IPT_OWNER_PID))
+ 			return 0;
+ 	}
+ 
+ 	if(info->match & IPT_OWNER_SID) {
+-		if (!match_sid(skb, info->sid) ^
++		if (!match_sid(sk, info->sid) ^
+ 		    !!(info->invert & IPT_OWNER_SID))
+ 			return 0;
+ 	}
+ 
+ 	if(info->match & IPT_OWNER_COMM) {
+-		if (!match_comm(skb, info->comm) ^
++		if (!match_comm(sk, info->comm) ^
+ 		    !!(info->invert & IPT_OWNER_COMM))
+ 			return 0;
+ 	}
+@@ -164,8 +193,10 @@
+            unsigned int hook_mask)
+ {
+         if (hook_mask
+-            & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING))) {
+-                printk("ipt_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
++            & ~((1 << NF_IP_LOCAL_OUT) | (1 << NF_IP_POST_ROUTING) |
++		(1 << NF_IP_LOCAL_IN)  | (1 << NF_IP_PRE_ROUTING))) {
++                printk("ipt_owner: only valid for LOCAL_OUT, LOCAL_IN, "
++		       "POST_ROUTING or PRE_ROUTING.\n");
+                 return 0;
+         }
+ 
+diff -urN ../kernel/linux-2.4.20-pre4/net/netsyms.c linux-2.4.20-pre4/net/netsyms.c
+--- ../kernel/linux-2.4.20-pre4/net/netsyms.c	2002-08-29 01:56:13.000000000 +0200
++++ linux-2.4.20-pre4/net/netsyms.c	2002-08-28 22:19:39.000000000 +0200
+@@ -597,4 +597,9 @@
+ EXPORT_SYMBOL(wireless_send_event);
+ #endif /* CONFIG_NET_RADIO || CONFIG_NET_PCMCIA_RADIO */
+ 
++#if defined(CONFIG_IP_NF_MATCH_OWNER)||defined(CONFIG_IP_NF_MATCH_OWNER_MODULE)
++EXPORT_SYMBOL(tcp_v4_lookup);
++EXPORT_SYMBOL(udp_v4_lookup);
++#endif /* CONFIG_IP_NF_MATCH_OWNER */
++
+ #endif  /* CONFIG_NET */
diff -urN patch-o-matic-clean/extra/owner-socketlookup.patch.help patch-o-matic/extra/owner-socketlookup.patch.help
--- patch-o-matic-clean/extra/owner-socketlookup.patch.help	1970-01-01 01:00:00.000000000 +0100
+++ patch-o-matic/extra/owner-socketlookup.patch.help	2002-08-30 01:37:47.000000000 +0200
@@ -0,0 +1,13 @@
+Author: Patrick McHardy <kaber@trash.net>
+Status: working
+
+The patch allows you to use the owner match in the INPUT/PREROUTING chains to
+match properties of the receiving socket.
+
+Example:
+
+	# Allow packets coming in on eth0 to sockets owned be local user
+	# kaber
+	
+	iptables -A INPUT -i eth0 -m owner --uid-owner kaber -j ACCEPT
+

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