net: sched: cls_bpf: add BPF-based classifier

This work contains a lightweight BPF-based traffic classifier that can
serve as a flexible alternative to ematch-based tree classification, i.e.
now that BPF filter engine can also be JITed in the kernel. Naturally, tc
actions and policies are supported as well with cls_bpf. Multiple BPF
programs/filter can be attached for a class, or they can just as well be
written within a single BPF program, that's really up to the user how he
wishes to run/optimize the code, e.g. also for inversion of verdicts etc.
The notion of a BPF program's return/exit codes is being kept as follows:

     0: No match
    -1: Select classid given in "tc filter ..." command
  else: flowid, overwrite the default one

As a minimal usage example with iproute2, we use a 3 band prio root qdisc
on a router with sfq each as leave, and assign ssh and icmp bpf-based
filters to band 1, http traffic to band 2 and the rest to band 3. For the
first two bands we load the bytecode from a file, in the 2nd we load it
inline as an example:

echo 1 > /proc/sys/net/core/bpf_jit_enable

tc qdisc del dev em1 root
tc qdisc add dev em1 root handle 1: prio bands 3 priomap 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1

tc qdisc add dev em1 parent 1:1 sfq perturb 16
tc qdisc add dev em1 parent 1:2 sfq perturb 16
tc qdisc add dev em1 parent 1:3 sfq perturb 16

tc filter add dev em1 parent 1: bpf run bytecode-file /etc/tc/ssh.bpf flowid 1:1
tc filter add dev em1 parent 1: bpf run bytecode-file /etc/tc/icmp.bpf flowid 1:1
tc filter add dev em1 parent 1: bpf run bytecode-file /etc/tc/http.bpf flowid 1:2
tc filter add dev em1 parent 1: bpf run bytecode "`bpfc -f tc -i misc.ops`" flowid 1:3

BPF programs can be easily created and passed to tc, either as inline
'bytecode' or 'bytecode-file'. There are a couple of front-ends that can
compile opcodes, for example:

1) People familiar with tcpdump-like filters:

   tcpdump -iem1 -ddd port 22 | tr '\n' ',' > /etc/tc/ssh.bpf

2) People that want to low-level program their filters or use BPF
   extensions that lack support by libpcap's compiler:

   bpfc -f tc -i ssh.ops > /etc/tc/ssh.bpf

   ssh.ops example code:
   ldh [12]
   jne #0x800, drop
   ldb [23]
   jneq #6, drop
   ldh [20]
   jset #0x1fff, drop
   ldxb 4 * ([14] & 0xf)
   ldh [%x + 14]
   jeq #0x16, pass
   ldh [%x + 16]
   jne #0x16, drop
   pass: ret #-1
   drop: ret #0

It was chosen to load bytecode into tc, since the reverse operation,
tc filter list dev em1, is then able to show the exact commands again.
Possible follow-up work could also include a small expression compiler
for iproute2. Tested with the help of bmon. This idea came up during
the Netfilter Workshop 2013 in Copenhagen. Also thanks to feedback from
Eric Dumazet!

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index 082eafa..25731df 100644 (file)
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -388,6 +388,20 @@ enum {
 
 #define TCA_CGROUP_MAX (__TCA_CGROUP_MAX - 1)
 
+/* BPF classifier */
+
+enum {
+       TCA_BPF_UNSPEC,
+       TCA_BPF_ACT,
+       TCA_BPF_POLICE,
+       TCA_BPF_CLASSID,
+       TCA_BPF_OPS_LEN,
+       TCA_BPF_OPS,
+       __TCA_BPF_MAX,
+};
+
+#define TCA_BPF_MAX (__TCA_BPF_MAX - 1)
+
 /* Extended Matches */
 
 struct tcf_ematch_tree_hdr {

diff --git a/net/sched/Kconfig b/net/sched/Kconfig
index c03a32a..ad1f1d8 100644 (file)
--- a/net/sched/Kconfig
+++ b/net/sched/Kconfig
@@ -443,6 +443,16 @@ config NET_CLS_CGROUP
          To compile this code as a module, choose M here: the
          module will be called cls_cgroup.
 
+config NET_CLS_BPF
+       tristate "BPF-based classifier"
+       select NET_CLS
+       ---help---
+         If you say Y here, you will be able to classify packets based on
+         programmable BPF (JIT'ed) filters as an alternative to ematches.
+
+         To compile this code as a module, choose M here: the module will
+         be called cls_bpf.
+
 config NET_EMATCH
        bool "Extended Matches"
        select NET_CLS

diff --git a/net/sched/Makefile b/net/sched/Makefile
index e5f9abe..35fa47a 100644 (file)
--- a/net/sched/Makefile
+++ b/net/sched/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_NET_CLS_RSVP6)   += cls_rsvp6.o
 obj-$(CONFIG_NET_CLS_BASIC)    += cls_basic.o
 obj-$(CONFIG_NET_CLS_FLOW)     += cls_flow.o
 obj-$(CONFIG_NET_CLS_CGROUP)   += cls_cgroup.o
+obj-$(CONFIG_NET_CLS_BPF)      += cls_bpf.o
 obj-$(CONFIG_NET_EMATCH)       += ematch.o
 obj-$(CONFIG_NET_EMATCH_CMP)   += em_cmp.o
 obj-$(CONFIG_NET_EMATCH_NBYTE) += em_nbyte.o

diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
new file mode 100644 (file)
index 0000000..1002a82
--- /dev/null
+++ b/net/sched/cls_bpf.c
@@ -0,0 +1,385 @@
+/*
+ * Berkeley Packet Filter based traffic classifier
+ *
+ * Might be used to classify traffic through flexible, user-defined and
+ * possibly JIT-ed BPF filters for traffic control as an alternative to
+ * ematches.
+ *
+ * (C) 2013 Daniel Borkmann <dborkman@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/skbuff.h>
+#include <linux/filter.h>
+#include <net/rtnetlink.h>
+#include <net/pkt_cls.h>
+#include <net/sock.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>");
+MODULE_DESCRIPTION("TC BPF based classifier");
+
+struct cls_bpf_head {
+       struct list_head plist;
+       u32 hgen;
+};
+
+struct cls_bpf_prog {
+       struct sk_filter *filter;
+       struct sock_filter *bpf_ops;
+       struct tcf_exts exts;
+       struct tcf_result res;
+       struct list_head link;
+       u32 handle;
+       u16 bpf_len;
+};
+
+static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = {
+       [TCA_BPF_CLASSID]       = { .type = NLA_U32 },
+       [TCA_BPF_OPS_LEN]       = { .type = NLA_U16 },
+       [TCA_BPF_OPS]           = { .type = NLA_BINARY,
+                                   .len = sizeof(struct sock_filter) * BPF_MAXINSNS },
+};
+
+static const struct tcf_ext_map bpf_ext_map = {
+       .action = TCA_BPF_ACT,
+       .police = TCA_BPF_POLICE,
+};
+
+static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp,
+                           struct tcf_result *res)
+{
+       struct cls_bpf_head *head = tp->root;
+       struct cls_bpf_prog *prog;
+       int ret;
+
+       list_for_each_entry(prog, &head->plist, link) {
+               int filter_res = SK_RUN_FILTER(prog->filter, skb);
+
+               if (filter_res == 0)
+                       continue;
+
+               *res = prog->res;
+               if (filter_res != -1)
+                       res->classid = filter_res;
+
+               ret = tcf_exts_exec(skb, &prog->exts, res);
+               if (ret < 0)
+                       continue;
+
+               return ret;
+       }
+
+       return -1;
+}
+
+static int cls_bpf_init(struct tcf_proto *tp)
+{
+       struct cls_bpf_head *head;
+
+       head = kzalloc(sizeof(*head), GFP_KERNEL);
+       if (head == NULL)
+               return -ENOBUFS;
+
+       INIT_LIST_HEAD(&head->plist);
+       tp->root = head;
+
+       return 0;
+}
+
+static void cls_bpf_delete_prog(struct tcf_proto *tp, struct cls_bpf_prog *prog)
+{
+       tcf_unbind_filter(tp, &prog->res);
+       tcf_exts_destroy(tp, &prog->exts);
+
+       sk_unattached_filter_destroy(prog->filter);
+
+       kfree(prog->bpf_ops);
+       kfree(prog);
+}
+
+static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg)
+{
+       struct cls_bpf_head *head = tp->root;
+       struct cls_bpf_prog *prog, *todel = (struct cls_bpf_prog *) arg;
+
+       list_for_each_entry(prog, &head->plist, link) {
+               if (prog == todel) {
+                       tcf_tree_lock(tp);
+                       list_del(&prog->link);
+                       tcf_tree_unlock(tp);
+
+                       cls_bpf_delete_prog(tp, prog);
+                       return 0;
+               }
+       }
+
+       return -ENOENT;
+}
+
+static void cls_bpf_destroy(struct tcf_proto *tp)
+{
+       struct cls_bpf_head *head = tp->root;
+       struct cls_bpf_prog *prog, *tmp;
+
+       list_for_each_entry_safe(prog, tmp, &head->plist, link) {
+               list_del(&prog->link);
+               cls_bpf_delete_prog(tp, prog);
+       }
+
+       kfree(head);
+}
+
+static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle)
+{
+       struct cls_bpf_head *head = tp->root;
+       struct cls_bpf_prog *prog;
+       unsigned long ret = 0UL;
+
+       if (head == NULL)
+               return 0UL;
+
+       list_for_each_entry(prog, &head->plist, link) {
+               if (prog->handle == handle) {
+                       ret = (unsigned long) prog;
+                       break;
+               }
+       }
+
+       return ret;
+}
+
+static void cls_bpf_put(struct tcf_proto *tp, unsigned long f)
+{
+}
+
+static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp,
+                                  struct cls_bpf_prog *prog,
+                                  unsigned long base, struct nlattr **tb,
+                                  struct nlattr *est)
+{
+       struct sock_filter *bpf_ops, *bpf_old;
+       struct tcf_exts exts;
+       struct sock_fprog tmp;
+       struct sk_filter *fp, *fp_old;
+       u16 bpf_size, bpf_len;
+       u32 classid;
+       int ret;
+
+       if (!tb[TCA_BPF_OPS_LEN] || !tb[TCA_BPF_OPS] || !tb[TCA_BPF_CLASSID])
+               return -EINVAL;
+
+       ret = tcf_exts_validate(net, tp, tb, est, &exts, &bpf_ext_map);
+       if (ret < 0)
+               return ret;
+
+       classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
+       bpf_len = nla_get_u16(tb[TCA_BPF_OPS_LEN]);
+       if (bpf_len > BPF_MAXINSNS || bpf_len == 0) {
+               ret = -EINVAL;
+               goto errout;
+       }
+
+       bpf_size = bpf_len * sizeof(*bpf_ops);
+       bpf_ops = kzalloc(bpf_size, GFP_KERNEL);
+       if (bpf_ops == NULL) {
+               ret = -ENOMEM;
+               goto errout;
+       }
+
+       memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size);
+
+       tmp.len = bpf_len;
+       tmp.filter = (struct sock_filter __user *) bpf_ops;
+
+       ret = sk_unattached_filter_create(&fp, &tmp);
+       if (ret)
+               goto errout_free;
+
+       tcf_tree_lock(tp);
+       fp_old = prog->filter;
+       bpf_old = prog->bpf_ops;
+
+       prog->bpf_len = bpf_len;
+       prog->bpf_ops = bpf_ops;
+       prog->filter = fp;
+       prog->res.classid = classid;
+       tcf_tree_unlock(tp);
+
+       tcf_bind_filter(tp, &prog->res, base);
+       tcf_exts_change(tp, &prog->exts, &exts);
+
+       if (fp_old)
+               sk_unattached_filter_destroy(fp_old);
+       if (bpf_old)
+               kfree(bpf_old);
+
+       return 0;
+
+errout_free:
+       kfree(bpf_ops);
+errout:
+       tcf_exts_destroy(tp, &exts);
+       return ret;
+}
+
+static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp,
+                                  struct cls_bpf_head *head)
+{
+       unsigned int i = 0x80000000;
+
+       do {
+               if (++head->hgen == 0x7FFFFFFF)
+                       head->hgen = 1;
+       } while (--i > 0 && cls_bpf_get(tp, head->hgen));
+       if (i == 0)
+               pr_err("Insufficient number of handles\n");
+
+       return i;
+}
+
+static int cls_bpf_change(struct net *net, struct sk_buff *in_skb,
+                         struct tcf_proto *tp, unsigned long base,
+                         u32 handle, struct nlattr **tca,
+                         unsigned long *arg)
+{
+       struct cls_bpf_head *head = tp->root;
+       struct cls_bpf_prog *prog = (struct cls_bpf_prog *) *arg;
+       struct nlattr *tb[TCA_BPF_MAX + 1];
+       int ret;
+
+       if (tca[TCA_OPTIONS] == NULL)
+               return -EINVAL;
+
+       ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy);
+       if (ret < 0)
+               return ret;
+
+       if (prog != NULL) {
+               if (handle && prog->handle != handle)
+                       return -EINVAL;
+               return cls_bpf_modify_existing(net, tp, prog, base, tb,
+                                              tca[TCA_RATE]);
+       }
+
+       prog = kzalloc(sizeof(*prog), GFP_KERNEL);
+       if (prog == NULL)
+               return -ENOBUFS;
+
+       if (handle == 0)
+               prog->handle = cls_bpf_grab_new_handle(tp, head);
+       else
+               prog->handle = handle;
+       if (prog->handle == 0) {
+               ret = -EINVAL;
+               goto errout;
+       }
+
+       ret = cls_bpf_modify_existing(net, tp, prog, base, tb, tca[TCA_RATE]);
+       if (ret < 0)
+               goto errout;
+
+       tcf_tree_lock(tp);
+       list_add(&prog->link, &head->plist);
+       tcf_tree_unlock(tp);
+
+       *arg = (unsigned long) prog;
+
+       return 0;
+errout:
+       if (*arg == 0UL && prog)
+               kfree(prog);
+
+       return ret;
+}
+
+static int cls_bpf_dump(struct tcf_proto *tp, unsigned long fh,
+                       struct sk_buff *skb, struct tcmsg *tm)
+{
+       struct cls_bpf_prog *prog = (struct cls_bpf_prog *) fh;
+       struct nlattr *nest, *nla;
+
+       if (prog == NULL)
+               return skb->len;
+
+       tm->tcm_handle = prog->handle;
+
+       nest = nla_nest_start(skb, TCA_OPTIONS);
+       if (nest == NULL)
+               goto nla_put_failure;
+
+       if (nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid))
+               goto nla_put_failure;
+       if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_len))
+               goto nla_put_failure;
+
+       nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_len *
+                         sizeof(struct sock_filter));
+       if (nla == NULL)
+               goto nla_put_failure;
+
+        memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla));
+
+       if (tcf_exts_dump(skb, &prog->exts, &bpf_ext_map) < 0)
+               goto nla_put_failure;
+
+       nla_nest_end(skb, nest);
+
+       if (tcf_exts_dump_stats(skb, &prog->exts, &bpf_ext_map) < 0)
+               goto nla_put_failure;
+
+       return skb->len;
+
+nla_put_failure:
+       nla_nest_cancel(skb, nest);
+       return -1;
+}
+
+static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg)
+{
+       struct cls_bpf_head *head = tp->root;
+       struct cls_bpf_prog *prog;
+
+       list_for_each_entry(prog, &head->plist, link) {
+               if (arg->count < arg->skip)
+                       goto skip;
+               if (arg->fn(tp, (unsigned long) prog, arg) < 0) {
+                       arg->stop = 1;
+                       break;
+               }
+skip:
+               arg->count++;
+       }
+}
+
+static struct tcf_proto_ops cls_bpf_ops __read_mostly = {
+       .kind           =       "bpf",
+       .owner          =       THIS_MODULE,
+       .classify       =       cls_bpf_classify,
+       .init           =       cls_bpf_init,
+       .destroy        =       cls_bpf_destroy,
+       .get            =       cls_bpf_get,
+       .put            =       cls_bpf_put,
+       .change         =       cls_bpf_change,
+       .delete         =       cls_bpf_delete,
+       .walk           =       cls_bpf_walk,
+       .dump           =       cls_bpf_dump,
+};
+
+static int __init cls_bpf_init_mod(void)
+{
+       return register_tcf_proto_ops(&cls_bpf_ops);
+}
+
+static void __exit cls_bpf_exit_mod(void)
+{
+       unregister_tcf_proto_ops(&cls_bpf_ops);
+}
+
+module_init(cls_bpf_init_mod);
+module_exit(cls_bpf_exit_mod);