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![Martin KaFai Lau](/assets/img/avatar_default.png)
The current tc-bpf@ingress reads and writes the __sk_buff->tstamp as a (rcv) timestamp which currently could either be 0 (not available) or ktime_get_real(). This patch is to backward compatible with the (rcv) timestamp expectation at ingress. If the skb->tstamp has the delivery_time, the bpf insn rewrite will read 0 for tc-bpf running at ingress as it is not available. When writing at ingress, it will also clear the skb->mono_delivery_time bit. /* BPF_READ: a = __sk_buff->tstamp */ if (!skb->tc_at_ingress || !skb->mono_delivery_time) a = skb->tstamp; else a = 0 /* BPF_WRITE: __sk_buff->tstamp = a */ if (skb->tc_at_ingress) skb->mono_delivery_time = 0; skb->tstamp = a; [ A note on the BPF_CGROUP_INET_INGRESS which can also access skb->tstamp. At that point, the skb is delivered locally and skb_clear_delivery_time() has already been done, so the skb->tstamp will only have the (rcv) timestamp. ] If the tc-bpf@egress writes 0 to skb->tstamp, the skb->mono_delivery_time has to be cleared also. It could be done together during convert_ctx_access(). However, the latter patch will also expose the skb->mono_delivery_time bit as __sk_buff->delivery_time_type. Changing the delivery_time_type in the background may surprise the user, e.g. the 2nd read on __sk_buff->delivery_time_type may need a READ_ONCE() to avoid compiler optimization. Thus, in expecting the needs in the latter patch, this patch does a check on !skb->tstamp after running the tc-bpf and clears the skb->mono_delivery_time bit if needed. The earlier discussion on v4 [0]. The bpf insn rewrite requires the skb's mono_delivery_time bit and tc_at_ingress bit. They are moved up in sk_buff so that bpf rewrite can be done at a fixed offset. tc_skip_classify is moved together with tc_at_ingress. To get one bit for mono_delivery_time, csum_not_inet is moved down and this bit is currently used by sctp. [0]: https://lore.kernel.org/bpf/20220217015043.khqwqklx45c4m4se@kafai-mbp.dhcp.thefacebook.com/ Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
722 lines
17 KiB
C
722 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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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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#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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u32 gen_flags;
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unsigned int in_hw_count;
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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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struct rcu_work rwork;
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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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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 (unlikely(!skb->tstamp && skb->mono_delivery_time))
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skb->mono_delivery_time = 0;
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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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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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struct cls_bpf_prog *oldprog,
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struct netlink_ext_ack *extack)
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{
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struct tcf_block *block = tp->chain->block;
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struct tc_cls_bpf_offload cls_bpf = {};
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struct cls_bpf_prog *obj;
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bool skip_sw;
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int err;
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skip_sw = prog && tc_skip_sw(prog->gen_flags);
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obj = prog ?: oldprog;
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tc_cls_common_offload_init(&cls_bpf.common, tp, obj->gen_flags, extack);
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cls_bpf.command = TC_CLSBPF_OFFLOAD;
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cls_bpf.exts = &obj->exts;
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cls_bpf.prog = prog ? prog->filter : NULL;
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cls_bpf.oldprog = oldprog ? oldprog->filter : NULL;
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cls_bpf.name = obj->bpf_name;
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cls_bpf.exts_integrated = obj->exts_integrated;
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if (oldprog && prog)
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err = tc_setup_cb_replace(block, tp, TC_SETUP_CLSBPF, &cls_bpf,
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skip_sw, &oldprog->gen_flags,
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&oldprog->in_hw_count,
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&prog->gen_flags, &prog->in_hw_count,
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true);
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else if (prog)
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err = tc_setup_cb_add(block, tp, TC_SETUP_CLSBPF, &cls_bpf,
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skip_sw, &prog->gen_flags,
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&prog->in_hw_count, true);
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else
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err = tc_setup_cb_destroy(block, tp, TC_SETUP_CLSBPF, &cls_bpf,
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skip_sw, &oldprog->gen_flags,
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&oldprog->in_hw_count, true);
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if (prog && err) {
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cls_bpf_offload_cmd(tp, oldprog, prog, extack);
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return err;
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}
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if (prog && 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 u32 cls_bpf_flags(u32 flags)
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{
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return flags & CLS_BPF_SUPPORTED_GEN_FLAGS;
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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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struct netlink_ext_ack *extack)
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{
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if (prog && oldprog &&
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cls_bpf_flags(prog->gen_flags) !=
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cls_bpf_flags(oldprog->gen_flags))
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return -EINVAL;
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if (prog && tc_skip_hw(prog->gen_flags))
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prog = NULL;
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if (oldprog && tc_skip_hw(oldprog->gen_flags))
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oldprog = NULL;
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if (!prog && !oldprog)
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return 0;
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return cls_bpf_offload_cmd(tp, prog, oldprog, extack);
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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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struct netlink_ext_ack *extack)
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{
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int err;
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err = cls_bpf_offload_cmd(tp, NULL, prog, extack);
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if (err)
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pr_err("Stopping hardware offload failed: %d\n", err);
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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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struct tcf_block *block = tp->chain->block;
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struct tc_cls_bpf_offload cls_bpf = {};
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tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, NULL);
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cls_bpf.command = TC_CLSBPF_STATS;
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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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tc_setup_cb_call(block, TC_SETUP_CLSBPF, &cls_bpf, false, true);
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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(to_rcu_work(work),
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struct cls_bpf_prog,
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rwork);
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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(struct tcf_proto *tp, struct cls_bpf_prog *prog,
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struct netlink_ext_ack *extack)
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{
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struct cls_bpf_head *head = rtnl_dereference(tp->root);
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idr_remove(&head->handle_idr, prog->handle);
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cls_bpf_stop_offload(tp, prog, extack);
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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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tcf_queue_work(&prog->rwork, cls_bpf_delete_prog_work);
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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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bool rtnl_held, struct netlink_ext_ack *extack)
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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, extack);
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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, bool rtnl_held,
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struct netlink_ext_ack *extack)
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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, extack);
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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 = kmemdup(nla_data(tb[TCA_BPF_OPS]), bpf_size, GFP_KERNEL);
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if (bpf_ops == NULL)
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return -ENOMEM;
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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)
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tcf_block_netif_keep_dst(tp->chain->block);
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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, u32 flags,
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struct netlink_ext_ack *extack)
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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, flags,
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extack);
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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;
|
|
|
|
ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) :
|
|
cls_bpf_prog_from_efd(tb, prog, gen_flags, tp);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (tb[TCA_BPF_CLASSID]) {
|
|
prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]);
|
|
tcf_bind_filter(tp, &prog->res, base);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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,
|
|
void **arg, u32 flags,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct cls_bpf_head *head = rtnl_dereference(tp->root);
|
|
struct cls_bpf_prog *oldprog = *arg;
|
|
struct nlattr *tb[TCA_BPF_MAX + 1];
|
|
struct cls_bpf_prog *prog;
|
|
int ret;
|
|
|
|
if (tca[TCA_OPTIONS] == NULL)
|
|
return -EINVAL;
|
|
|
|
ret = nla_parse_nested_deprecated(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, net, 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) {
|
|
handle = 1;
|
|
ret = idr_alloc_u32(&head->handle_idr, prog, &handle,
|
|
INT_MAX, GFP_KERNEL);
|
|
} else if (!oldprog) {
|
|
ret = idr_alloc_u32(&head->handle_idr, prog, &handle,
|
|
handle, GFP_KERNEL);
|
|
}
|
|
|
|
if (ret)
|
|
goto errout;
|
|
prog->handle = handle;
|
|
|
|
ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], flags,
|
|
extack);
|
|
if (ret < 0)
|
|
goto errout_idr;
|
|
|
|
ret = cls_bpf_offload(tp, prog, oldprog, extack);
|
|
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(&head->handle_idr, prog, handle);
|
|
list_replace_rcu(&oldprog->link, &prog->link);
|
|
tcf_unbind_filter(tp, &oldprog->res);
|
|
tcf_exts_get_net(&oldprog->exts);
|
|
tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work);
|
|
} 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(&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, bool rtnl_held)
|
|
{
|
|
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_noflag(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,
|
|
void *q, unsigned long base)
|
|
{
|
|
struct cls_bpf_prog *prog = fh;
|
|
|
|
if (prog && prog->res.classid == classid) {
|
|
if (cl)
|
|
__tcf_bind_filter(q, &prog->res, base);
|
|
else
|
|
__tcf_unbind_filter(q, &prog->res);
|
|
}
|
|
}
|
|
|
|
static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg,
|
|
bool rtnl_held)
|
|
{
|
|
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 int cls_bpf_reoffload(struct tcf_proto *tp, bool add, flow_setup_cb_t *cb,
|
|
void *cb_priv, struct netlink_ext_ack *extack)
|
|
{
|
|
struct cls_bpf_head *head = rtnl_dereference(tp->root);
|
|
struct tcf_block *block = tp->chain->block;
|
|
struct tc_cls_bpf_offload cls_bpf = {};
|
|
struct cls_bpf_prog *prog;
|
|
int err;
|
|
|
|
list_for_each_entry(prog, &head->plist, link) {
|
|
if (tc_skip_hw(prog->gen_flags))
|
|
continue;
|
|
|
|
tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags,
|
|
extack);
|
|
cls_bpf.command = TC_CLSBPF_OFFLOAD;
|
|
cls_bpf.exts = &prog->exts;
|
|
cls_bpf.prog = add ? prog->filter : NULL;
|
|
cls_bpf.oldprog = add ? NULL : prog->filter;
|
|
cls_bpf.name = prog->bpf_name;
|
|
cls_bpf.exts_integrated = prog->exts_integrated;
|
|
|
|
err = tc_setup_cb_reoffload(block, tp, add, cb, TC_SETUP_CLSBPF,
|
|
&cls_bpf, cb_priv, &prog->gen_flags,
|
|
&prog->in_hw_count);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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,
|
|
.reoffload = cls_bpf_reoffload,
|
|
.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);
|