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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-03 17:40:04 +00:00
![Jakub Kicinski](/assets/img/avatar_default.png)
When cls_bpf offload was added it seemed like a good idea to
call cls_bpf_delete_prog() instead of extending the error
handling path, since the software state is fully initialized
at that point. This handling of errors without jumping to
the end of the function is error prone, as proven by later
commit missing that extra call to __cls_bpf_delete_prog().
__cls_bpf_delete_prog() is now expected to be invoked with
a reference on exts->net or the field zeroed out. The call
on the offload's error patch does not fullfil this requirement,
leading to each error stealing a reference on net namespace.
Create a function undoing what cls_bpf_set_parms() did and
use it from __cls_bpf_delete_prog() and the error path.
Fixes: aae2c35ec8
("cls_bpf: use tcf_exts_get_net() before call_rcu()")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
694 lines
16 KiB
C
694 lines
16 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 <linux/idr.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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struct idr handle_idr;
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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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u16 bpf_num_ops;
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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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union {
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struct work_struct work;
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struct rcu_head rcu;
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};
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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_TRAP:
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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_pointers(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_pointers(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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bool addorrep = cmd == TC_CLSBPF_ADD || cmd == TC_CLSBPF_REPLACE;
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struct tcf_block *block = tp->chain->block;
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bool skip_sw = tc_skip_sw(prog->gen_flags);
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struct tc_cls_bpf_offload cls_bpf = {};
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int err;
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tc_cls_common_offload_init(&cls_bpf.common, tp);
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cls_bpf.command = cmd;
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cls_bpf.exts = &prog->exts;
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cls_bpf.prog = prog->filter;
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cls_bpf.name = prog->bpf_name;
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cls_bpf.exts_integrated = prog->exts_integrated;
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cls_bpf.gen_flags = prog->gen_flags;
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err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSBPF, &cls_bpf, skip_sw);
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if (addorrep) {
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if (err < 0) {
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cls_bpf_offload_cmd(tp, prog, TC_CLSBPF_DESTROY);
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return err;
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} else if (err > 0) {
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prog->gen_flags |= TCA_CLS_FLAGS_IN_HW;
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}
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}
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if (addorrep && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW))
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return -EINVAL;
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return 0;
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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 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_skip_hw(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_skip_hw(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 ret;
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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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idr_init(&head->handle_idr);
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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_free_parms(struct cls_bpf_prog *prog)
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{
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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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}
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static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog)
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{
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tcf_exts_destroy(&prog->exts);
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tcf_exts_put_net(&prog->exts);
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cls_bpf_free_parms(prog);
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kfree(prog);
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}
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static void cls_bpf_delete_prog_work(struct work_struct *work)
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{
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struct cls_bpf_prog *prog = container_of(work, struct cls_bpf_prog, work);
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rtnl_lock();
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__cls_bpf_delete_prog(prog);
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rtnl_unlock();
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}
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static void cls_bpf_delete_prog_rcu(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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INIT_WORK(&prog->work, cls_bpf_delete_prog_work);
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tcf_queue_work(&prog->work);
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}
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static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog)
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{
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struct cls_bpf_head *head = rtnl_dereference(tp->root);
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idr_remove_ext(&head->handle_idr, prog->handle);
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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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if (tcf_exts_get_net(&prog->exts))
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call_rcu(&prog->rcu, cls_bpf_delete_prog_rcu);
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else
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__cls_bpf_delete_prog(prog);
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}
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static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last)
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{
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struct cls_bpf_head *head = rtnl_dereference(tp->root);
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__cls_bpf_delete(tp, arg);
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*last = list_empty(&head->plist);
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return 0;
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}
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static void cls_bpf_destroy(struct tcf_proto *tp)
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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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list_for_each_entry_safe(prog, tmp, &head->plist, link)
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__cls_bpf_delete(tp, prog);
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idr_destroy(&head->handle_idr);
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kfree_rcu(head, rcu);
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}
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static void *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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list_for_each_entry(prog, &head->plist, link) {
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if (prog->handle == handle)
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return prog;
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}
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return NULL;
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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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u32 gen_flags, 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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bool skip_sw;
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u32 bpf_fd;
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bpf_fd = nla_get_u32(tb[TCA_BPF_FD]);
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skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW;
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fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw);
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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 = nla_memdup(tb[TCA_BPF_NAME], 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_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_set_parms(struct net *net, struct tcf_proto *tp,
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struct cls_bpf_prog *prog, unsigned long base,
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struct nlattr **tb, 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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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_validate(net, tp, tb, est, &prog->exts, ovr);
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if (ret < 0)
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return ret;
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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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return -EINVAL;
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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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return -EINVAL;
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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, gen_flags, tp);
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if (ret < 0)
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return ret;
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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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return 0;
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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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void **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 = *arg;
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struct nlattr *tb[TCA_BPF_MAX + 1];
|
|
struct cls_bpf_prog *prog;
|
|
unsigned long idr_index;
|
|
int ret;
|
|
|
|
if (tca[TCA_OPTIONS] == NULL)
|
|
return -EINVAL;
|
|
|
|
ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy,
|
|
NULL);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
prog = kzalloc(sizeof(*prog), GFP_KERNEL);
|
|
if (!prog)
|
|
return -ENOBUFS;
|
|
|
|
ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE);
|
|
if (ret < 0)
|
|
goto errout;
|
|
|
|
if (oldprog) {
|
|
if (handle && oldprog->handle != handle) {
|
|
ret = -EINVAL;
|
|
goto errout;
|
|
}
|
|
}
|
|
|
|
if (handle == 0) {
|
|
ret = idr_alloc_ext(&head->handle_idr, prog, &idr_index,
|
|
1, 0x7FFFFFFF, GFP_KERNEL);
|
|
if (ret)
|
|
goto errout;
|
|
prog->handle = idr_index;
|
|
} else {
|
|
if (!oldprog) {
|
|
ret = idr_alloc_ext(&head->handle_idr, prog, &idr_index,
|
|
handle, handle + 1, GFP_KERNEL);
|
|
if (ret)
|
|
goto errout;
|
|
}
|
|
prog->handle = handle;
|
|
}
|
|
|
|
ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr);
|
|
if (ret < 0)
|
|
goto errout_idr;
|
|
|
|
ret = cls_bpf_offload(tp, prog, oldprog);
|
|
if (ret)
|
|
goto errout_parms;
|
|
|
|
if (!tc_in_hw(prog->gen_flags))
|
|
prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW;
|
|
|
|
if (oldprog) {
|
|
idr_replace_ext(&head->handle_idr, prog, handle);
|
|
list_replace_rcu(&oldprog->link, &prog->link);
|
|
tcf_unbind_filter(tp, &oldprog->res);
|
|
tcf_exts_get_net(&oldprog->exts);
|
|
call_rcu(&oldprog->rcu, cls_bpf_delete_prog_rcu);
|
|
} else {
|
|
list_add_rcu(&prog->link, &head->plist);
|
|
}
|
|
|
|
*arg = prog;
|
|
return 0;
|
|
|
|
errout_parms:
|
|
cls_bpf_free_parms(prog);
|
|
errout_idr:
|
|
if (!oldprog)
|
|
idr_remove_ext(&head->handle_idr, prog->handle);
|
|
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)
|
|
{
|
|
struct nlattr *nla;
|
|
|
|
if (prog->bpf_name &&
|
|
nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name))
|
|
return -EMSGSIZE;
|
|
|
|
if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id))
|
|
return -EMSGSIZE;
|
|
|
|
nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag));
|
|
if (nla == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
memcpy(nla_data(nla), prog->filter->tag, nla_len(nla));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh,
|
|
struct sk_buff *skb, struct tcmsg *tm)
|
|
{
|
|
struct cls_bpf_prog *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_bind_class(void *fh, u32 classid, unsigned long cl)
|
|
{
|
|
struct cls_bpf_prog *prog = fh;
|
|
|
|
if (prog && prog->res.classid == classid)
|
|
prog->res.class = cl;
|
|
}
|
|
|
|
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, 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,
|
|
.bind_class = cls_bpf_bind_class,
|
|
};
|
|
|
|
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);
|