![Jamal Hadi Salim](/assets/img/avatar_default.png)
Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
722 lines
16 KiB
C
722 lines
16 KiB
C
/*
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* net/sched/cls_flow.c Generic flow classifier
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*
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* Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/jhash.h>
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#include <linux/random.h>
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#include <linux/pkt_cls.h>
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#include <linux/skbuff.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/if_vlan.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <net/inet_sock.h>
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#include <net/pkt_cls.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <net/flow_dissector.h>
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#if IS_ENABLED(CONFIG_NF_CONNTRACK)
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#include <net/netfilter/nf_conntrack.h>
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#endif
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struct flow_head {
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struct list_head filters;
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struct rcu_head rcu;
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};
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struct flow_filter {
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struct list_head list;
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struct tcf_exts exts;
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struct tcf_ematch_tree ematches;
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struct tcf_proto *tp;
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struct timer_list perturb_timer;
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u32 perturb_period;
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u32 handle;
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u32 nkeys;
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u32 keymask;
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u32 mode;
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u32 mask;
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u32 xor;
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u32 rshift;
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u32 addend;
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u32 divisor;
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u32 baseclass;
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u32 hashrnd;
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struct rcu_head rcu;
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};
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static inline u32 addr_fold(void *addr)
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{
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unsigned long a = (unsigned long)addr;
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return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0);
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}
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static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow)
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{
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__be32 src = flow_get_u32_src(flow);
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if (src)
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return ntohl(src);
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return addr_fold(skb->sk);
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}
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static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow)
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{
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__be32 dst = flow_get_u32_dst(flow);
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if (dst)
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return ntohl(dst);
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return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb);
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}
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static u32 flow_get_proto(const struct sk_buff *skb,
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const struct flow_keys *flow)
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{
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return flow->basic.ip_proto;
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}
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static u32 flow_get_proto_src(const struct sk_buff *skb,
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const struct flow_keys *flow)
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{
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if (flow->ports.ports)
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return ntohs(flow->ports.src);
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return addr_fold(skb->sk);
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}
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static u32 flow_get_proto_dst(const struct sk_buff *skb,
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const struct flow_keys *flow)
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{
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if (flow->ports.ports)
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return ntohs(flow->ports.dst);
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return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb);
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}
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static u32 flow_get_iif(const struct sk_buff *skb)
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{
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return skb->skb_iif;
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}
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static u32 flow_get_priority(const struct sk_buff *skb)
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{
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return skb->priority;
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}
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static u32 flow_get_mark(const struct sk_buff *skb)
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{
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return skb->mark;
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}
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static u32 flow_get_nfct(const struct sk_buff *skb)
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{
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#if IS_ENABLED(CONFIG_NF_CONNTRACK)
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return addr_fold(skb->nfct);
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#else
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return 0;
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#endif
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}
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#if IS_ENABLED(CONFIG_NF_CONNTRACK)
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#define CTTUPLE(skb, member) \
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({ \
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enum ip_conntrack_info ctinfo; \
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const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \
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if (ct == NULL) \
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goto fallback; \
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ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \
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})
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#else
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#define CTTUPLE(skb, member) \
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({ \
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goto fallback; \
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0; \
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})
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#endif
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static u32 flow_get_nfct_src(const struct sk_buff *skb,
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const struct flow_keys *flow)
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{
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switch (tc_skb_protocol(skb)) {
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case htons(ETH_P_IP):
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return ntohl(CTTUPLE(skb, src.u3.ip));
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case htons(ETH_P_IPV6):
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return ntohl(CTTUPLE(skb, src.u3.ip6[3]));
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}
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fallback:
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return flow_get_src(skb, flow);
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}
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static u32 flow_get_nfct_dst(const struct sk_buff *skb,
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const struct flow_keys *flow)
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{
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switch (tc_skb_protocol(skb)) {
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case htons(ETH_P_IP):
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return ntohl(CTTUPLE(skb, dst.u3.ip));
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case htons(ETH_P_IPV6):
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return ntohl(CTTUPLE(skb, dst.u3.ip6[3]));
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}
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fallback:
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return flow_get_dst(skb, flow);
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}
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static u32 flow_get_nfct_proto_src(const struct sk_buff *skb,
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const struct flow_keys *flow)
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{
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return ntohs(CTTUPLE(skb, src.u.all));
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fallback:
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return flow_get_proto_src(skb, flow);
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}
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static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb,
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const struct flow_keys *flow)
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{
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return ntohs(CTTUPLE(skb, dst.u.all));
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fallback:
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return flow_get_proto_dst(skb, flow);
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}
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static u32 flow_get_rtclassid(const struct sk_buff *skb)
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{
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#ifdef CONFIG_IP_ROUTE_CLASSID
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if (skb_dst(skb))
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return skb_dst(skb)->tclassid;
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#endif
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return 0;
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}
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static u32 flow_get_skuid(const struct sk_buff *skb)
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{
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struct sock *sk = skb_to_full_sk(skb);
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if (sk && sk->sk_socket && sk->sk_socket->file) {
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kuid_t skuid = sk->sk_socket->file->f_cred->fsuid;
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return from_kuid(&init_user_ns, skuid);
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}
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return 0;
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}
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static u32 flow_get_skgid(const struct sk_buff *skb)
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{
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struct sock *sk = skb_to_full_sk(skb);
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if (sk && sk->sk_socket && sk->sk_socket->file) {
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kgid_t skgid = sk->sk_socket->file->f_cred->fsgid;
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return from_kgid(&init_user_ns, skgid);
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}
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return 0;
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}
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static u32 flow_get_vlan_tag(const struct sk_buff *skb)
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{
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u16 uninitialized_var(tag);
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if (vlan_get_tag(skb, &tag) < 0)
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return 0;
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return tag & VLAN_VID_MASK;
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}
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static u32 flow_get_rxhash(struct sk_buff *skb)
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{
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return skb_get_hash(skb);
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}
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static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow)
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{
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switch (key) {
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case FLOW_KEY_SRC:
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return flow_get_src(skb, flow);
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case FLOW_KEY_DST:
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return flow_get_dst(skb, flow);
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case FLOW_KEY_PROTO:
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return flow_get_proto(skb, flow);
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case FLOW_KEY_PROTO_SRC:
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return flow_get_proto_src(skb, flow);
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case FLOW_KEY_PROTO_DST:
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return flow_get_proto_dst(skb, flow);
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case FLOW_KEY_IIF:
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return flow_get_iif(skb);
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case FLOW_KEY_PRIORITY:
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return flow_get_priority(skb);
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case FLOW_KEY_MARK:
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return flow_get_mark(skb);
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case FLOW_KEY_NFCT:
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return flow_get_nfct(skb);
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case FLOW_KEY_NFCT_SRC:
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return flow_get_nfct_src(skb, flow);
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case FLOW_KEY_NFCT_DST:
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return flow_get_nfct_dst(skb, flow);
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case FLOW_KEY_NFCT_PROTO_SRC:
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return flow_get_nfct_proto_src(skb, flow);
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case FLOW_KEY_NFCT_PROTO_DST:
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return flow_get_nfct_proto_dst(skb, flow);
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case FLOW_KEY_RTCLASSID:
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return flow_get_rtclassid(skb);
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case FLOW_KEY_SKUID:
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return flow_get_skuid(skb);
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case FLOW_KEY_SKGID:
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return flow_get_skgid(skb);
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case FLOW_KEY_VLAN_TAG:
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return flow_get_vlan_tag(skb);
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case FLOW_KEY_RXHASH:
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return flow_get_rxhash(skb);
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default:
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WARN_ON(1);
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return 0;
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}
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}
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#define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) | \
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(1 << FLOW_KEY_DST) | \
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(1 << FLOW_KEY_PROTO) | \
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(1 << FLOW_KEY_PROTO_SRC) | \
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(1 << FLOW_KEY_PROTO_DST) | \
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(1 << FLOW_KEY_NFCT_SRC) | \
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(1 << FLOW_KEY_NFCT_DST) | \
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(1 << FLOW_KEY_NFCT_PROTO_SRC) | \
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(1 << FLOW_KEY_NFCT_PROTO_DST))
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static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp,
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struct tcf_result *res)
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{
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struct flow_head *head = rcu_dereference_bh(tp->root);
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struct flow_filter *f;
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u32 keymask;
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u32 classid;
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unsigned int n, key;
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int r;
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list_for_each_entry_rcu(f, &head->filters, list) {
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u32 keys[FLOW_KEY_MAX + 1];
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struct flow_keys flow_keys;
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if (!tcf_em_tree_match(skb, &f->ematches, NULL))
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continue;
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keymask = f->keymask;
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if (keymask & FLOW_KEYS_NEEDED)
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skb_flow_dissect_flow_keys(skb, &flow_keys, 0);
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for (n = 0; n < f->nkeys; n++) {
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key = ffs(keymask) - 1;
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keymask &= ~(1 << key);
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keys[n] = flow_key_get(skb, key, &flow_keys);
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}
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if (f->mode == FLOW_MODE_HASH)
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classid = jhash2(keys, f->nkeys, f->hashrnd);
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else {
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classid = keys[0];
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classid = (classid & f->mask) ^ f->xor;
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classid = (classid >> f->rshift) + f->addend;
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}
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if (f->divisor)
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classid %= f->divisor;
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res->class = 0;
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res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid);
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r = tcf_exts_exec(skb, &f->exts, res);
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if (r < 0)
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continue;
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return r;
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}
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return -1;
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}
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static void flow_perturbation(unsigned long arg)
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{
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struct flow_filter *f = (struct flow_filter *)arg;
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get_random_bytes(&f->hashrnd, 4);
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if (f->perturb_period)
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mod_timer(&f->perturb_timer, jiffies + f->perturb_period);
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}
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static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = {
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[TCA_FLOW_KEYS] = { .type = NLA_U32 },
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[TCA_FLOW_MODE] = { .type = NLA_U32 },
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[TCA_FLOW_BASECLASS] = { .type = NLA_U32 },
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[TCA_FLOW_RSHIFT] = { .type = NLA_U32 },
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[TCA_FLOW_ADDEND] = { .type = NLA_U32 },
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[TCA_FLOW_MASK] = { .type = NLA_U32 },
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[TCA_FLOW_XOR] = { .type = NLA_U32 },
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[TCA_FLOW_DIVISOR] = { .type = NLA_U32 },
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[TCA_FLOW_ACT] = { .type = NLA_NESTED },
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[TCA_FLOW_POLICE] = { .type = NLA_NESTED },
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[TCA_FLOW_EMATCHES] = { .type = NLA_NESTED },
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[TCA_FLOW_PERTURB] = { .type = NLA_U32 },
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};
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static void flow_destroy_filter(struct rcu_head *head)
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{
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struct flow_filter *f = container_of(head, struct flow_filter, rcu);
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del_timer_sync(&f->perturb_timer);
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tcf_exts_destroy(&f->exts);
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tcf_em_tree_destroy(&f->ematches);
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kfree(f);
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}
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static int flow_change(struct net *net, struct sk_buff *in_skb,
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struct tcf_proto *tp, unsigned long base,
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u32 handle, struct nlattr **tca,
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unsigned long *arg, bool ovr)
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{
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struct flow_head *head = rtnl_dereference(tp->root);
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struct flow_filter *fold, *fnew;
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struct nlattr *opt = tca[TCA_OPTIONS];
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struct nlattr *tb[TCA_FLOW_MAX + 1];
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struct tcf_exts e;
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struct tcf_ematch_tree t;
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unsigned int nkeys = 0;
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unsigned int perturb_period = 0;
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u32 baseclass = 0;
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u32 keymask = 0;
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u32 mode;
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int err;
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if (opt == NULL)
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return -EINVAL;
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err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy);
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if (err < 0)
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return err;
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if (tb[TCA_FLOW_BASECLASS]) {
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baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]);
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if (TC_H_MIN(baseclass) == 0)
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return -EINVAL;
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}
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if (tb[TCA_FLOW_KEYS]) {
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keymask = nla_get_u32(tb[TCA_FLOW_KEYS]);
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nkeys = hweight32(keymask);
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if (nkeys == 0)
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return -EINVAL;
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if (fls(keymask) - 1 > FLOW_KEY_MAX)
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return -EOPNOTSUPP;
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if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) &&
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sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns)
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return -EOPNOTSUPP;
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}
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err = tcf_exts_init(&e, TCA_FLOW_ACT, TCA_FLOW_POLICE);
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if (err < 0)
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goto err1;
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err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);
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if (err < 0)
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goto err1;
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err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &t);
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if (err < 0)
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goto err1;
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err = -ENOBUFS;
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fnew = kzalloc(sizeof(*fnew), GFP_KERNEL);
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if (!fnew)
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goto err2;
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err = tcf_exts_init(&fnew->exts, TCA_FLOW_ACT, TCA_FLOW_POLICE);
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if (err < 0)
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goto err3;
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fold = (struct flow_filter *)*arg;
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if (fold) {
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err = -EINVAL;
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if (fold->handle != handle && handle)
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goto err3;
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/* Copy fold into fnew */
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fnew->tp = fold->tp;
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fnew->handle = fold->handle;
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fnew->nkeys = fold->nkeys;
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fnew->keymask = fold->keymask;
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fnew->mode = fold->mode;
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fnew->mask = fold->mask;
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fnew->xor = fold->xor;
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fnew->rshift = fold->rshift;
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fnew->addend = fold->addend;
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fnew->divisor = fold->divisor;
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fnew->baseclass = fold->baseclass;
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fnew->hashrnd = fold->hashrnd;
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mode = fold->mode;
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if (tb[TCA_FLOW_MODE])
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mode = nla_get_u32(tb[TCA_FLOW_MODE]);
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if (mode != FLOW_MODE_HASH && nkeys > 1)
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goto err3;
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if (mode == FLOW_MODE_HASH)
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perturb_period = fold->perturb_period;
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if (tb[TCA_FLOW_PERTURB]) {
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if (mode != FLOW_MODE_HASH)
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goto err3;
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perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
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}
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} else {
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err = -EINVAL;
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if (!handle)
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goto err3;
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if (!tb[TCA_FLOW_KEYS])
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goto err3;
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mode = FLOW_MODE_MAP;
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if (tb[TCA_FLOW_MODE])
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mode = nla_get_u32(tb[TCA_FLOW_MODE]);
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if (mode != FLOW_MODE_HASH && nkeys > 1)
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goto err3;
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if (tb[TCA_FLOW_PERTURB]) {
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if (mode != FLOW_MODE_HASH)
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goto err3;
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perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ;
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}
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|
|
if (TC_H_MAJ(baseclass) == 0)
|
|
baseclass = TC_H_MAKE(tp->q->handle, baseclass);
|
|
if (TC_H_MIN(baseclass) == 0)
|
|
baseclass = TC_H_MAKE(baseclass, 1);
|
|
|
|
fnew->handle = handle;
|
|
fnew->mask = ~0U;
|
|
fnew->tp = tp;
|
|
get_random_bytes(&fnew->hashrnd, 4);
|
|
}
|
|
|
|
fnew->perturb_timer.function = flow_perturbation;
|
|
fnew->perturb_timer.data = (unsigned long)fnew;
|
|
init_timer_deferrable(&fnew->perturb_timer);
|
|
|
|
tcf_exts_change(tp, &fnew->exts, &e);
|
|
tcf_em_tree_change(tp, &fnew->ematches, &t);
|
|
|
|
netif_keep_dst(qdisc_dev(tp->q));
|
|
|
|
if (tb[TCA_FLOW_KEYS]) {
|
|
fnew->keymask = keymask;
|
|
fnew->nkeys = nkeys;
|
|
}
|
|
|
|
fnew->mode = mode;
|
|
|
|
if (tb[TCA_FLOW_MASK])
|
|
fnew->mask = nla_get_u32(tb[TCA_FLOW_MASK]);
|
|
if (tb[TCA_FLOW_XOR])
|
|
fnew->xor = nla_get_u32(tb[TCA_FLOW_XOR]);
|
|
if (tb[TCA_FLOW_RSHIFT])
|
|
fnew->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]);
|
|
if (tb[TCA_FLOW_ADDEND])
|
|
fnew->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]);
|
|
|
|
if (tb[TCA_FLOW_DIVISOR])
|
|
fnew->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]);
|
|
if (baseclass)
|
|
fnew->baseclass = baseclass;
|
|
|
|
fnew->perturb_period = perturb_period;
|
|
if (perturb_period)
|
|
mod_timer(&fnew->perturb_timer, jiffies + perturb_period);
|
|
|
|
if (*arg == 0)
|
|
list_add_tail_rcu(&fnew->list, &head->filters);
|
|
else
|
|
list_replace_rcu(&fold->list, &fnew->list);
|
|
|
|
*arg = (unsigned long)fnew;
|
|
|
|
if (fold)
|
|
call_rcu(&fold->rcu, flow_destroy_filter);
|
|
return 0;
|
|
|
|
err3:
|
|
tcf_exts_destroy(&fnew->exts);
|
|
err2:
|
|
tcf_em_tree_destroy(&t);
|
|
kfree(fnew);
|
|
err1:
|
|
tcf_exts_destroy(&e);
|
|
return err;
|
|
}
|
|
|
|
static int flow_delete(struct tcf_proto *tp, unsigned long arg)
|
|
{
|
|
struct flow_filter *f = (struct flow_filter *)arg;
|
|
|
|
list_del_rcu(&f->list);
|
|
call_rcu(&f->rcu, flow_destroy_filter);
|
|
return 0;
|
|
}
|
|
|
|
static int flow_init(struct tcf_proto *tp)
|
|
{
|
|
struct flow_head *head;
|
|
|
|
head = kzalloc(sizeof(*head), GFP_KERNEL);
|
|
if (head == NULL)
|
|
return -ENOBUFS;
|
|
INIT_LIST_HEAD(&head->filters);
|
|
rcu_assign_pointer(tp->root, head);
|
|
return 0;
|
|
}
|
|
|
|
static bool flow_destroy(struct tcf_proto *tp, bool force)
|
|
{
|
|
struct flow_head *head = rtnl_dereference(tp->root);
|
|
struct flow_filter *f, *next;
|
|
|
|
if (!force && !list_empty(&head->filters))
|
|
return false;
|
|
|
|
list_for_each_entry_safe(f, next, &head->filters, list) {
|
|
list_del_rcu(&f->list);
|
|
call_rcu(&f->rcu, flow_destroy_filter);
|
|
}
|
|
RCU_INIT_POINTER(tp->root, NULL);
|
|
kfree_rcu(head, rcu);
|
|
return true;
|
|
}
|
|
|
|
static unsigned long flow_get(struct tcf_proto *tp, u32 handle)
|
|
{
|
|
struct flow_head *head = rtnl_dereference(tp->root);
|
|
struct flow_filter *f;
|
|
|
|
list_for_each_entry(f, &head->filters, list)
|
|
if (f->handle == handle)
|
|
return (unsigned long)f;
|
|
return 0;
|
|
}
|
|
|
|
static int flow_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
|
|
struct sk_buff *skb, struct tcmsg *t)
|
|
{
|
|
struct flow_filter *f = (struct flow_filter *)fh;
|
|
struct nlattr *nest;
|
|
|
|
if (f == NULL)
|
|
return skb->len;
|
|
|
|
t->tcm_handle = f->handle;
|
|
|
|
nest = nla_nest_start(skb, TCA_OPTIONS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) ||
|
|
nla_put_u32(skb, TCA_FLOW_MODE, f->mode))
|
|
goto nla_put_failure;
|
|
|
|
if (f->mask != ~0 || f->xor != 0) {
|
|
if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) ||
|
|
nla_put_u32(skb, TCA_FLOW_XOR, f->xor))
|
|
goto nla_put_failure;
|
|
}
|
|
if (f->rshift &&
|
|
nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift))
|
|
goto nla_put_failure;
|
|
if (f->addend &&
|
|
nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend))
|
|
goto nla_put_failure;
|
|
|
|
if (f->divisor &&
|
|
nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor))
|
|
goto nla_put_failure;
|
|
if (f->baseclass &&
|
|
nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass))
|
|
goto nla_put_failure;
|
|
|
|
if (f->perturb_period &&
|
|
nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ))
|
|
goto nla_put_failure;
|
|
|
|
if (tcf_exts_dump(skb, &f->exts) < 0)
|
|
goto nla_put_failure;
|
|
#ifdef CONFIG_NET_EMATCH
|
|
if (f->ematches.hdr.nmatches &&
|
|
tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0)
|
|
goto nla_put_failure;
|
|
#endif
|
|
nla_nest_end(skb, nest);
|
|
|
|
if (tcf_exts_dump_stats(skb, &f->exts) < 0)
|
|
goto nla_put_failure;
|
|
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nla_nest_cancel(skb, nest);
|
|
return -1;
|
|
}
|
|
|
|
static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg)
|
|
{
|
|
struct flow_head *head = rtnl_dereference(tp->root);
|
|
struct flow_filter *f;
|
|
|
|
list_for_each_entry(f, &head->filters, list) {
|
|
if (arg->count < arg->skip)
|
|
goto skip;
|
|
if (arg->fn(tp, (unsigned long)f, arg) < 0) {
|
|
arg->stop = 1;
|
|
break;
|
|
}
|
|
skip:
|
|
arg->count++;
|
|
}
|
|
}
|
|
|
|
static struct tcf_proto_ops cls_flow_ops __read_mostly = {
|
|
.kind = "flow",
|
|
.classify = flow_classify,
|
|
.init = flow_init,
|
|
.destroy = flow_destroy,
|
|
.change = flow_change,
|
|
.delete = flow_delete,
|
|
.get = flow_get,
|
|
.dump = flow_dump,
|
|
.walk = flow_walk,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init cls_flow_init(void)
|
|
{
|
|
return register_tcf_proto_ops(&cls_flow_ops);
|
|
}
|
|
|
|
static void __exit cls_flow_exit(void)
|
|
{
|
|
unregister_tcf_proto_ops(&cls_flow_ops);
|
|
}
|
|
|
|
module_init(cls_flow_init);
|
|
module_exit(cls_flow_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
|
|
MODULE_DESCRIPTION("TC flow classifier");
|