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720 lines
17 KiB
720 lines
17 KiB
// 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 <[email protected]> |
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*/ |
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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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|
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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 <[email protected]>"); |
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MODULE_DESCRIPTION("TC BPF based classifier"); |
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|
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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 (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, bool ovr, |
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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, ovr, true, |
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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; |
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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, 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 *oldprog = *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_deprecated(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], |
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bpf_policy, NULL); |
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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, net, 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; |
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goto errout; |
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} |
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} |
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|
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if (handle == 0) { |
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handle = 1; |
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ret = idr_alloc_u32(&head->handle_idr, prog, &handle, |
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INT_MAX, GFP_KERNEL); |
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} else if (!oldprog) { |
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ret = idr_alloc_u32(&head->handle_idr, prog, &handle, |
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handle, GFP_KERNEL); |
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} |
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|
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if (ret) |
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goto errout; |
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prog->handle = handle; |
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ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr, |
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extack); |
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if (ret < 0) |
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goto errout_idr; |
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ret = cls_bpf_offload(tp, prog, oldprog, extack); |
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if (ret) |
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goto errout_parms; |
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|
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if (!tc_in_hw(prog->gen_flags)) |
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prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; |
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if (oldprog) { |
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idr_replace(&head->handle_idr, prog, handle); |
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list_replace_rcu(&oldprog->link, &prog->link); |
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tcf_unbind_filter(tp, &oldprog->res); |
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tcf_exts_get_net(&oldprog->exts); |
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tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work); |
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} else { |
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list_add_rcu(&prog->link, &head->plist); |
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} |
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*arg = prog; |
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return 0; |
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|
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errout_parms: |
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cls_bpf_free_parms(prog); |
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errout_idr: |
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if (!oldprog) |
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idr_remove(&head->handle_idr, prog->handle); |
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errout: |
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tcf_exts_destroy(&prog->exts); |
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kfree(prog); |
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return ret; |
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} |
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|
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static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
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struct sk_buff *skb) |
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{ |
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struct nlattr *nla; |
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|
|
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);
|
|
|