![Jakub Kicinski](/assets/img/avatar_default.png)
Call into offloaded filters to update stats. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
671 lines
15 KiB
C
671 lines
15 KiB
C
/*
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* Berkeley Packet Filter based traffic classifier
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*
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* Might be used to classify traffic through flexible, user-defined and
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* possibly JIT-ed BPF filters for traffic control as an alternative to
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* ematches.
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*
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* (C) 2013 Daniel Borkmann <dborkman@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <linux/filter.h>
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#include <linux/bpf.h>
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#include <net/rtnetlink.h>
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#include <net/pkt_cls.h>
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#include <net/sock.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>");
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MODULE_DESCRIPTION("TC BPF based classifier");
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#define CLS_BPF_NAME_LEN 256
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#define CLS_BPF_SUPPORTED_GEN_FLAGS \
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(TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW)
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struct cls_bpf_head {
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struct list_head plist;
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u32 hgen;
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struct rcu_head rcu;
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};
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struct cls_bpf_prog {
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struct bpf_prog *filter;
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struct list_head link;
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struct tcf_result res;
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bool exts_integrated;
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bool offloaded;
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u32 gen_flags;
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struct tcf_exts exts;
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u32 handle;
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union {
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u32 bpf_fd;
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u16 bpf_num_ops;
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};
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struct sock_filter *bpf_ops;
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const char *bpf_name;
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struct tcf_proto *tp;
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struct rcu_head rcu;
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};
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static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = {
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[TCA_BPF_CLASSID] = { .type = NLA_U32 },
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[TCA_BPF_FLAGS] = { .type = NLA_U32 },
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[TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 },
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[TCA_BPF_FD] = { .type = NLA_U32 },
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[TCA_BPF_NAME] = { .type = NLA_NUL_STRING,
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.len = CLS_BPF_NAME_LEN },
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[TCA_BPF_OPS_LEN] = { .type = NLA_U16 },
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[TCA_BPF_OPS] = { .type = NLA_BINARY,
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.len = sizeof(struct sock_filter) * BPF_MAXINSNS },
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};
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static int cls_bpf_exec_opcode(int code)
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{
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switch (code) {
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case TC_ACT_OK:
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case TC_ACT_SHOT:
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case TC_ACT_STOLEN:
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case TC_ACT_REDIRECT:
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case TC_ACT_UNSPEC:
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return code;
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default:
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return TC_ACT_UNSPEC;
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}
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}
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static int cls_bpf_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 cls_bpf_head *head = rcu_dereference_bh(tp->root);
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bool at_ingress = skb_at_tc_ingress(skb);
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struct cls_bpf_prog *prog;
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int ret = -1;
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/* Needed here for accessing maps. */
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rcu_read_lock();
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list_for_each_entry_rcu(prog, &head->plist, link) {
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int filter_res;
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qdisc_skb_cb(skb)->tc_classid = prog->res.classid;
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if (tc_skip_sw(prog->gen_flags)) {
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filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0;
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} else if (at_ingress) {
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/* It is safe to push/pull even if skb_shared() */
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__skb_push(skb, skb->mac_len);
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bpf_compute_data_end(skb);
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filter_res = BPF_PROG_RUN(prog->filter, skb);
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__skb_pull(skb, skb->mac_len);
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} else {
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bpf_compute_data_end(skb);
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filter_res = BPF_PROG_RUN(prog->filter, skb);
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}
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if (prog->exts_integrated) {
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res->class = 0;
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res->classid = TC_H_MAJ(prog->res.classid) |
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qdisc_skb_cb(skb)->tc_classid;
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ret = cls_bpf_exec_opcode(filter_res);
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if (ret == TC_ACT_UNSPEC)
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continue;
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break;
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}
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if (filter_res == 0)
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continue;
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if (filter_res != -1) {
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res->class = 0;
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res->classid = filter_res;
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} else {
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*res = prog->res;
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}
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ret = tcf_exts_exec(skb, &prog->exts, res);
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if (ret < 0)
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continue;
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break;
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}
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rcu_read_unlock();
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return ret;
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}
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static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog)
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{
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return !prog->bpf_ops;
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}
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static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog,
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enum tc_clsbpf_command cmd)
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{
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struct net_device *dev = tp->q->dev_queue->dev;
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struct tc_cls_bpf_offload bpf_offload = {};
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struct tc_to_netdev offload;
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offload.type = TC_SETUP_CLSBPF;
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offload.cls_bpf = &bpf_offload;
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bpf_offload.command = cmd;
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bpf_offload.exts = &prog->exts;
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bpf_offload.prog = prog->filter;
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bpf_offload.name = prog->bpf_name;
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bpf_offload.exts_integrated = prog->exts_integrated;
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bpf_offload.gen_flags = prog->gen_flags;
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return dev->netdev_ops->ndo_setup_tc(dev, tp->q->handle,
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tp->protocol, &offload);
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}
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static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog,
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struct cls_bpf_prog *oldprog)
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{
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struct net_device *dev = tp->q->dev_queue->dev;
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struct cls_bpf_prog *obj = prog;
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enum tc_clsbpf_command cmd;
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bool skip_sw;
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int ret;
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skip_sw = tc_skip_sw(prog->gen_flags) ||
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(oldprog && tc_skip_sw(oldprog->gen_flags));
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if (oldprog && oldprog->offloaded) {
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if (tc_should_offload(dev, tp, prog->gen_flags)) {
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cmd = TC_CLSBPF_REPLACE;
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} else if (!tc_skip_sw(prog->gen_flags)) {
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obj = oldprog;
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cmd = TC_CLSBPF_DESTROY;
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} else {
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return -EINVAL;
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}
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} else {
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if (!tc_should_offload(dev, tp, prog->gen_flags))
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return skip_sw ? -EINVAL : 0;
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cmd = TC_CLSBPF_ADD;
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}
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ret = cls_bpf_offload_cmd(tp, obj, cmd);
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if (ret)
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return skip_sw ? ret : 0;
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obj->offloaded = true;
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if (oldprog)
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oldprog->offloaded = false;
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return 0;
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}
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static void cls_bpf_stop_offload(struct tcf_proto *tp,
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struct cls_bpf_prog *prog)
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{
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int err;
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if (!prog->offloaded)
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return;
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err = cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_DESTROY);
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if (err) {
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pr_err("Stopping hardware offload failed: %d\n", err);
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return;
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}
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prog->offloaded = false;
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}
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static void cls_bpf_offload_update_stats(struct tcf_proto *tp,
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struct cls_bpf_prog *prog)
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{
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if (!prog->offloaded)
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return;
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cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_STATS);
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}
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static int cls_bpf_init(struct tcf_proto *tp)
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{
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struct cls_bpf_head *head;
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head = kzalloc(sizeof(*head), GFP_KERNEL);
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if (head == NULL)
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return -ENOBUFS;
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INIT_LIST_HEAD_RCU(&head->plist);
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rcu_assign_pointer(tp->root, head);
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return 0;
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}
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static void cls_bpf_delete_prog(struct tcf_proto *tp, struct cls_bpf_prog *prog)
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{
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tcf_exts_destroy(&prog->exts);
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if (cls_bpf_is_ebpf(prog))
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bpf_prog_put(prog->filter);
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else
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bpf_prog_destroy(prog->filter);
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kfree(prog->bpf_name);
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kfree(prog->bpf_ops);
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kfree(prog);
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}
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static void __cls_bpf_delete_prog(struct rcu_head *rcu)
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{
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struct cls_bpf_prog *prog = container_of(rcu, struct cls_bpf_prog, rcu);
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cls_bpf_delete_prog(prog->tp, prog);
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}
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static int cls_bpf_delete(struct tcf_proto *tp, unsigned long arg)
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{
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struct cls_bpf_prog *prog = (struct cls_bpf_prog *) arg;
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cls_bpf_stop_offload(tp, prog);
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list_del_rcu(&prog->link);
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tcf_unbind_filter(tp, &prog->res);
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call_rcu(&prog->rcu, __cls_bpf_delete_prog);
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return 0;
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}
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static bool cls_bpf_destroy(struct tcf_proto *tp, bool force)
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{
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struct cls_bpf_head *head = rtnl_dereference(tp->root);
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struct cls_bpf_prog *prog, *tmp;
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if (!force && !list_empty(&head->plist))
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return false;
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list_for_each_entry_safe(prog, tmp, &head->plist, link) {
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cls_bpf_stop_offload(tp, prog);
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list_del_rcu(&prog->link);
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tcf_unbind_filter(tp, &prog->res);
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call_rcu(&prog->rcu, __cls_bpf_delete_prog);
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}
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RCU_INIT_POINTER(tp->root, NULL);
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kfree_rcu(head, rcu);
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return true;
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}
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static unsigned long cls_bpf_get(struct tcf_proto *tp, u32 handle)
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{
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struct cls_bpf_head *head = rtnl_dereference(tp->root);
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struct cls_bpf_prog *prog;
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unsigned long ret = 0UL;
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if (head == NULL)
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return 0UL;
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list_for_each_entry(prog, &head->plist, link) {
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if (prog->handle == handle) {
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ret = (unsigned long) prog;
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break;
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}
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}
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return ret;
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}
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static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog)
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{
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struct sock_filter *bpf_ops;
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struct sock_fprog_kern fprog_tmp;
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struct bpf_prog *fp;
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u16 bpf_size, bpf_num_ops;
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int ret;
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bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]);
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if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0)
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return -EINVAL;
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bpf_size = bpf_num_ops * sizeof(*bpf_ops);
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if (bpf_size != nla_len(tb[TCA_BPF_OPS]))
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return -EINVAL;
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bpf_ops = kzalloc(bpf_size, GFP_KERNEL);
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if (bpf_ops == NULL)
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return -ENOMEM;
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memcpy(bpf_ops, nla_data(tb[TCA_BPF_OPS]), bpf_size);
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fprog_tmp.len = bpf_num_ops;
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fprog_tmp.filter = bpf_ops;
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ret = bpf_prog_create(&fp, &fprog_tmp);
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if (ret < 0) {
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kfree(bpf_ops);
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return ret;
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}
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prog->bpf_ops = bpf_ops;
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prog->bpf_num_ops = bpf_num_ops;
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prog->bpf_name = NULL;
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prog->filter = fp;
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return 0;
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}
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static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog,
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const struct tcf_proto *tp)
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{
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struct bpf_prog *fp;
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char *name = NULL;
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u32 bpf_fd;
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bpf_fd = nla_get_u32(tb[TCA_BPF_FD]);
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fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_CLS);
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if (IS_ERR(fp))
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return PTR_ERR(fp);
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if (tb[TCA_BPF_NAME]) {
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name = kmemdup(nla_data(tb[TCA_BPF_NAME]),
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nla_len(tb[TCA_BPF_NAME]),
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GFP_KERNEL);
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if (!name) {
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bpf_prog_put(fp);
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return -ENOMEM;
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}
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}
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prog->bpf_ops = NULL;
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prog->bpf_fd = bpf_fd;
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prog->bpf_name = name;
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prog->filter = fp;
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if (fp->dst_needed && !(tp->q->flags & TCQ_F_INGRESS))
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netif_keep_dst(qdisc_dev(tp->q));
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return 0;
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}
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static int cls_bpf_modify_existing(struct net *net, struct tcf_proto *tp,
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struct cls_bpf_prog *prog,
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unsigned long base, struct nlattr **tb,
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struct nlattr *est, bool ovr)
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{
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bool is_bpf, is_ebpf, have_exts = false;
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struct tcf_exts exts;
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u32 gen_flags = 0;
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int ret;
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is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS];
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is_ebpf = tb[TCA_BPF_FD];
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if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf))
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return -EINVAL;
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ret = tcf_exts_init(&exts, TCA_BPF_ACT, TCA_BPF_POLICE);
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if (ret < 0)
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return ret;
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ret = tcf_exts_validate(net, tp, tb, est, &exts, ovr);
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if (ret < 0)
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goto errout;
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if (tb[TCA_BPF_FLAGS]) {
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u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]);
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if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) {
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ret = -EINVAL;
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goto errout;
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}
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have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT;
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}
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if (tb[TCA_BPF_FLAGS_GEN]) {
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gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]);
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if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS ||
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!tc_flags_valid(gen_flags)) {
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ret = -EINVAL;
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goto errout;
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}
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}
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prog->exts_integrated = have_exts;
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prog->gen_flags = gen_flags;
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ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) :
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cls_bpf_prog_from_efd(tb, prog, tp);
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if (ret < 0)
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goto errout;
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if (tb[TCA_BPF_CLASSID]) {
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prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
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tcf_bind_filter(tp, &prog->res, base);
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}
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tcf_exts_change(tp, &prog->exts, &exts);
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return 0;
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errout:
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tcf_exts_destroy(&exts);
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return ret;
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}
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static u32 cls_bpf_grab_new_handle(struct tcf_proto *tp,
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struct cls_bpf_head *head)
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{
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unsigned int i = 0x80000000;
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u32 handle;
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do {
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if (++head->hgen == 0x7FFFFFFF)
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head->hgen = 1;
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} while (--i > 0 && cls_bpf_get(tp, head->hgen));
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if (unlikely(i == 0)) {
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pr_err("Insufficient number of handles\n");
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handle = 0;
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} else {
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handle = head->hgen;
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}
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return handle;
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}
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static int cls_bpf_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 cls_bpf_head *head = rtnl_dereference(tp->root);
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struct cls_bpf_prog *oldprog = (struct cls_bpf_prog *) *arg;
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struct nlattr *tb[TCA_BPF_MAX + 1];
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struct cls_bpf_prog *prog;
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int ret;
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if (tca[TCA_OPTIONS] == NULL)
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return -EINVAL;
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ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy);
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if (ret < 0)
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return ret;
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prog = kzalloc(sizeof(*prog), GFP_KERNEL);
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if (!prog)
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return -ENOBUFS;
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ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE);
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if (ret < 0)
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goto errout;
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if (oldprog) {
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if (handle && oldprog->handle != handle) {
|
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ret = -EINVAL;
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
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],
|
|
ovr);
|
|
if (ret < 0)
|
|
goto errout;
|
|
|
|
ret = cls_bpf_offload(tp, prog, oldprog);
|
|
if (ret) {
|
|
cls_bpf_delete_prog(tp, prog);
|
|
return ret;
|
|
}
|
|
|
|
if (oldprog) {
|
|
list_replace_rcu(&oldprog->link, &prog->link);
|
|
tcf_unbind_filter(tp, &oldprog->res);
|
|
call_rcu(&oldprog->rcu, __cls_bpf_delete_prog);
|
|
} else {
|
|
list_add_rcu(&prog->link, &head->plist);
|
|
}
|
|
|
|
*arg = (unsigned long) prog;
|
|
return 0;
|
|
|
|
errout:
|
|
tcf_exts_destroy(&prog->exts);
|
|
kfree(prog);
|
|
return ret;
|
|
}
|
|
|
|
static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct nlattr *nla;
|
|
|
|
if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops))
|
|
return -EMSGSIZE;
|
|
|
|
nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops *
|
|
sizeof(struct sock_filter));
|
|
if (nla == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog,
|
|
struct sk_buff *skb)
|
|
{
|
|
if (nla_put_u32(skb, TCA_BPF_FD, prog->bpf_fd))
|
|
return -EMSGSIZE;
|
|
|
|
if (prog->bpf_name &&
|
|
nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name))
|
|
return -EMSGSIZE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cls_bpf_dump(struct net *net, 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;
|
|
u32 bpf_flags = 0;
|
|
int ret;
|
|
|
|
if (prog == NULL)
|
|
return skb->len;
|
|
|
|
tm->tcm_handle = prog->handle;
|
|
|
|
cls_bpf_offload_update_stats(tp, prog);
|
|
|
|
nest = nla_nest_start(skb, TCA_OPTIONS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (prog->res.classid &&
|
|
nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid))
|
|
goto nla_put_failure;
|
|
|
|
if (cls_bpf_is_ebpf(prog))
|
|
ret = cls_bpf_dump_ebpf_info(prog, skb);
|
|
else
|
|
ret = cls_bpf_dump_bpf_info(prog, skb);
|
|
if (ret)
|
|
goto nla_put_failure;
|
|
|
|
if (tcf_exts_dump(skb, &prog->exts) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (prog->exts_integrated)
|
|
bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT;
|
|
if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags))
|
|
goto nla_put_failure;
|
|
if (prog->gen_flags &&
|
|
nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags))
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
|
|
if (tcf_exts_dump_stats(skb, &prog->exts) < 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 = rtnl_dereference(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,
|
|
.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);
|