bpf: Add __sk_buff->delivery_time_type and bpf_skb_set_skb_delivery_time()
* __sk_buff->delivery_time_type: This patch adds __sk_buff->delivery_time_type. It tells if the delivery_time is stored in __sk_buff->tstamp or not. It will be most useful for ingress to tell if the __sk_buff->tstamp has the (rcv) timestamp or delivery_time. If delivery_time_type is 0 (BPF_SKB_DELIVERY_TIME_NONE), it has the (rcv) timestamp. Two non-zero types are defined for the delivery_time_type, BPF_SKB_DELIVERY_TIME_MONO and BPF_SKB_DELIVERY_TIME_UNSPEC. For UNSPEC, it can only happen in egress because only mono delivery_time can be forwarded to ingress now. The clock of UNSPEC delivery_time can be deduced from the skb->sk->sk_clockid which is how the sch_etf doing it also. * Provide forwarded delivery_time to tc-bpf@ingress: With the help of the new delivery_time_type, the tc-bpf has a way to tell if the __sk_buff->tstamp has the (rcv) timestamp or the delivery_time. During bpf load time, the verifier will learn if the bpf prog has accessed the new __sk_buff->delivery_time_type. If it does, it means the tc-bpf@ingress is expecting the skb->tstamp could have the delivery_time. The kernel will then read the skb->tstamp as-is during bpf insn rewrite without checking the skb->mono_delivery_time. This is done by adding a new prog->delivery_time_access bit. The same goes for writing skb->tstamp. * bpf_skb_set_delivery_time(): The bpf_skb_set_delivery_time() helper is added to allow setting both delivery_time and the delivery_time_type at the same time. If the tc-bpf does not need to change the delivery_time_type, it can directly write to the __sk_buff->tstamp as the existing tc-bpf has already been doing. It will be most useful at ingress to change the __sk_buff->tstamp from the (rcv) timestamp to a mono delivery_time and then bpf_redirect_*(). bpf only has mono clock helper (bpf_ktime_get_ns), and the current known use case is the mono EDT for fq, and only mono delivery time can be kept during forward now, so bpf_skb_set_delivery_time() only supports setting BPF_SKB_DELIVERY_TIME_MONO. It can be extended later when use cases come up and the forwarding path also supports other clock bases. Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Martin KaFai Lau
David S. Miller
Родитель
7449197d60
Коммит
8d21ec0e46
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@ -572,7 +572,8 @@ struct bpf_prog {
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has_callchain_buf:1, /* callchain buffer allocated? */
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enforce_expected_attach_type:1, /* Enforce expected_attach_type checking at attach time */
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call_get_stack:1, /* Do we call bpf_get_stack() or bpf_get_stackid() */
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call_get_func_ip:1; /* Do we call get_func_ip() */
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call_get_func_ip:1, /* Do we call get_func_ip() */
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delivery_time_access:1; /* Accessed __sk_buff->delivery_time_type */
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enum bpf_prog_type type; /* Type of BPF program */
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enum bpf_attach_type expected_attach_type; /* For some prog types */
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u32 len; /* Number of filter blocks */
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@ -5086,6 +5086,37 @@ union bpf_attr {
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* Return
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* 0 on success, or a negative error in case of failure. On error
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* *dst* buffer is zeroed out.
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*
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* long bpf_skb_set_delivery_time(struct sk_buff *skb, u64 dtime, u32 dtime_type)
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* Description
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* Set a *dtime* (delivery time) to the __sk_buff->tstamp and also
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* change the __sk_buff->delivery_time_type to *dtime_type*.
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*
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* When setting a delivery time (non zero *dtime*) to
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* __sk_buff->tstamp, only BPF_SKB_DELIVERY_TIME_MONO *dtime_type*
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* is supported. It is the only delivery_time_type that will be
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* kept after bpf_redirect_*().
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*
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* If there is no need to change the __sk_buff->delivery_time_type,
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* the delivery time can be directly written to __sk_buff->tstamp
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* instead.
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*
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* *dtime* 0 and *dtime_type* BPF_SKB_DELIVERY_TIME_NONE
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* can be used to clear any delivery time stored in
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* __sk_buff->tstamp.
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*
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* Only IPv4 and IPv6 skb->protocol are supported.
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*
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* This function is most useful when it needs to set a
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* mono delivery time to __sk_buff->tstamp and then
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* bpf_redirect_*() to the egress of an iface. For example,
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* changing the (rcv) timestamp in __sk_buff->tstamp at
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* ingress to a mono delivery time and then bpf_redirect_*()
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* to sch_fq@phy-dev.
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* Return
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* 0 on success.
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* **-EINVAL** for invalid input
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* **-EOPNOTSUPP** for unsupported delivery_time_type and protocol
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*/
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#define __BPF_FUNC_MAPPER(FN) \
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FN(unspec), \
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@ -5280,6 +5311,7 @@ union bpf_attr {
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FN(xdp_load_bytes), \
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FN(xdp_store_bytes), \
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FN(copy_from_user_task), \
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FN(skb_set_delivery_time), \
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/* */
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/* integer value in 'imm' field of BPF_CALL instruction selects which helper
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@ -5469,6 +5501,12 @@ union { \
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__u64 :64; \
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} __attribute__((aligned(8)))
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enum {
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BPF_SKB_DELIVERY_TIME_NONE,
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BPF_SKB_DELIVERY_TIME_UNSPEC,
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BPF_SKB_DELIVERY_TIME_MONO,
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};
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/* user accessible mirror of in-kernel sk_buff.
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* new fields can only be added to the end of this structure
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*/
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@ -5509,7 +5547,8 @@ struct __sk_buff {
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__u32 gso_segs;
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__bpf_md_ptr(struct bpf_sock *, sk);
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__u32 gso_size;
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__u32 :32; /* Padding, future use. */
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__u8 delivery_time_type;
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__u32 :24; /* Padding, future use. */
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__u64 hwtstamp;
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};
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@ -7388,6 +7388,43 @@ static const struct bpf_func_proto bpf_sock_ops_reserve_hdr_opt_proto = {
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.arg3_type = ARG_ANYTHING,
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};
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BPF_CALL_3(bpf_skb_set_delivery_time, struct sk_buff *, skb,
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u64, dtime, u32, dtime_type)
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{
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/* skb_clear_delivery_time() is done for inet protocol */
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if (skb->protocol != htons(ETH_P_IP) &&
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skb->protocol != htons(ETH_P_IPV6))
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return -EOPNOTSUPP;
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switch (dtime_type) {
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case BPF_SKB_DELIVERY_TIME_MONO:
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if (!dtime)
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return -EINVAL;
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skb->tstamp = dtime;
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skb->mono_delivery_time = 1;
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break;
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case BPF_SKB_DELIVERY_TIME_NONE:
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if (dtime)
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return -EINVAL;
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skb->tstamp = 0;
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skb->mono_delivery_time = 0;
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static const struct bpf_func_proto bpf_skb_set_delivery_time_proto = {
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.func = bpf_skb_set_delivery_time,
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.gpl_only = false,
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.ret_type = RET_INTEGER,
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.arg1_type = ARG_PTR_TO_CTX,
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.arg2_type = ARG_ANYTHING,
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.arg3_type = ARG_ANYTHING,
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};
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#endif /* CONFIG_INET */
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bool bpf_helper_changes_pkt_data(void *func)
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@ -7749,6 +7786,8 @@ tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
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return &bpf_tcp_gen_syncookie_proto;
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case BPF_FUNC_sk_assign:
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return &bpf_sk_assign_proto;
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case BPF_FUNC_skb_set_delivery_time:
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return &bpf_skb_set_delivery_time_proto;
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#endif
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default:
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return bpf_sk_base_func_proto(func_id);
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@ -8088,7 +8127,9 @@ static bool bpf_skb_is_valid_access(int off, int size, enum bpf_access_type type
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return false;
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info->reg_type = PTR_TO_SOCK_COMMON_OR_NULL;
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break;
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case offsetofend(struct __sk_buff, gso_size) ... offsetof(struct __sk_buff, hwtstamp) - 1:
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case offsetof(struct __sk_buff, delivery_time_type):
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return false;
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case offsetofend(struct __sk_buff, delivery_time_type) ... offsetof(struct __sk_buff, hwtstamp) - 1:
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/* Explicitly prohibit access to padding in __sk_buff. */
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return false;
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default:
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@ -8443,6 +8484,15 @@ static bool tc_cls_act_is_valid_access(int off, int size,
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break;
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case bpf_ctx_range_till(struct __sk_buff, family, local_port):
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return false;
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case offsetof(struct __sk_buff, delivery_time_type):
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/* The convert_ctx_access() on reading and writing
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* __sk_buff->tstamp depends on whether the bpf prog
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* has used __sk_buff->delivery_time_type or not.
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* Thus, we need to set prog->delivery_time_access
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* earlier during is_valid_access() here.
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*/
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((struct bpf_prog *)prog)->delivery_time_access = 1;
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return size == sizeof(__u8);
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}
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return bpf_skb_is_valid_access(off, size, type, prog, info);
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@ -8838,6 +8888,45 @@ static u32 flow_dissector_convert_ctx_access(enum bpf_access_type type,
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return insn - insn_buf;
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}
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static struct bpf_insn *bpf_convert_dtime_type_read(const struct bpf_insn *si,
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struct bpf_insn *insn)
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{
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__u8 value_reg = si->dst_reg;
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__u8 skb_reg = si->src_reg;
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__u8 tmp_reg = BPF_REG_AX;
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*insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg,
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SKB_MONO_DELIVERY_TIME_OFFSET);
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*insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg,
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SKB_MONO_DELIVERY_TIME_MASK);
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*insn++ = BPF_JMP32_IMM(BPF_JEQ, tmp_reg, 0, 2);
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/* value_reg = BPF_SKB_DELIVERY_TIME_MONO */
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*insn++ = BPF_MOV32_IMM(value_reg, BPF_SKB_DELIVERY_TIME_MONO);
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*insn++ = BPF_JMP_A(IS_ENABLED(CONFIG_NET_CLS_ACT) ? 10 : 5);
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*insn++ = BPF_LDX_MEM(BPF_DW, tmp_reg, skb_reg,
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offsetof(struct sk_buff, tstamp));
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*insn++ = BPF_JMP_IMM(BPF_JNE, tmp_reg, 0, 2);
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/* value_reg = BPF_SKB_DELIVERY_TIME_NONE */
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*insn++ = BPF_MOV32_IMM(value_reg, BPF_SKB_DELIVERY_TIME_NONE);
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*insn++ = BPF_JMP_A(IS_ENABLED(CONFIG_NET_CLS_ACT) ? 6 : 1);
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#ifdef CONFIG_NET_CLS_ACT
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*insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, TC_AT_INGRESS_OFFSET);
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*insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, TC_AT_INGRESS_MASK);
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*insn++ = BPF_JMP32_IMM(BPF_JEQ, tmp_reg, 0, 2);
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/* At ingress, value_reg = 0 */
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*insn++ = BPF_MOV32_IMM(value_reg, 0);
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*insn++ = BPF_JMP_A(1);
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#endif
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/* value_reg = BPF_SKB_DELIVERYT_TIME_UNSPEC */
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*insn++ = BPF_MOV32_IMM(value_reg, BPF_SKB_DELIVERY_TIME_UNSPEC);
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/* 15 insns with CONFIG_NET_CLS_ACT */
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return insn;
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}
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static struct bpf_insn *bpf_convert_shinfo_access(const struct bpf_insn *si,
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struct bpf_insn *insn)
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{
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@ -8859,29 +8948,32 @@ static struct bpf_insn *bpf_convert_shinfo_access(const struct bpf_insn *si,
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return insn;
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}
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static struct bpf_insn *bpf_convert_tstamp_read(const struct bpf_insn *si,
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static struct bpf_insn *bpf_convert_tstamp_read(const struct bpf_prog *prog,
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const struct bpf_insn *si,
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struct bpf_insn *insn)
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{
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__u8 value_reg = si->dst_reg;
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__u8 skb_reg = si->src_reg;
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#ifdef CONFIG_NET_CLS_ACT
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__u8 tmp_reg = BPF_REG_AX;
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if (!prog->delivery_time_access) {
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__u8 tmp_reg = BPF_REG_AX;
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*insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, TC_AT_INGRESS_OFFSET);
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*insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, TC_AT_INGRESS_MASK);
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*insn++ = BPF_JMP32_IMM(BPF_JEQ, tmp_reg, 0, 5);
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/* @ingress, read __sk_buff->tstamp as the (rcv) timestamp,
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* so check the skb->mono_delivery_time.
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*/
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*insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg,
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SKB_MONO_DELIVERY_TIME_OFFSET);
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*insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg,
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SKB_MONO_DELIVERY_TIME_MASK);
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*insn++ = BPF_JMP32_IMM(BPF_JEQ, tmp_reg, 0, 2);
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/* skb->mono_delivery_time is set, read 0 as the (rcv) timestamp. */
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*insn++ = BPF_MOV64_IMM(value_reg, 0);
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*insn++ = BPF_JMP_A(1);
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*insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, TC_AT_INGRESS_OFFSET);
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*insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, TC_AT_INGRESS_MASK);
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*insn++ = BPF_JMP32_IMM(BPF_JEQ, tmp_reg, 0, 5);
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/* @ingress, read __sk_buff->tstamp as the (rcv) timestamp,
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* so check the skb->mono_delivery_time.
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*/
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*insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg,
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SKB_MONO_DELIVERY_TIME_OFFSET);
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*insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg,
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SKB_MONO_DELIVERY_TIME_MASK);
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*insn++ = BPF_JMP32_IMM(BPF_JEQ, tmp_reg, 0, 2);
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/* skb->mono_delivery_time is set, read 0 as the (rcv) timestamp. */
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*insn++ = BPF_MOV64_IMM(value_reg, 0);
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*insn++ = BPF_JMP_A(1);
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}
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#endif
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*insn++ = BPF_LDX_MEM(BPF_DW, value_reg, skb_reg,
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@ -8889,27 +8981,30 @@ static struct bpf_insn *bpf_convert_tstamp_read(const struct bpf_insn *si,
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return insn;
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}
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static struct bpf_insn *bpf_convert_tstamp_write(const struct bpf_insn *si,
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static struct bpf_insn *bpf_convert_tstamp_write(const struct bpf_prog *prog,
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const struct bpf_insn *si,
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struct bpf_insn *insn)
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{
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__u8 value_reg = si->src_reg;
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__u8 skb_reg = si->dst_reg;
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#ifdef CONFIG_NET_CLS_ACT
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__u8 tmp_reg = BPF_REG_AX;
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if (!prog->delivery_time_access) {
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__u8 tmp_reg = BPF_REG_AX;
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*insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, TC_AT_INGRESS_OFFSET);
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*insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, TC_AT_INGRESS_MASK);
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*insn++ = BPF_JMP32_IMM(BPF_JEQ, tmp_reg, 0, 3);
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/* Writing __sk_buff->tstamp at ingress as the (rcv) timestamp.
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* Clear the skb->mono_delivery_time.
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*/
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*insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg,
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SKB_MONO_DELIVERY_TIME_OFFSET);
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*insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg,
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~SKB_MONO_DELIVERY_TIME_MASK);
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*insn++ = BPF_STX_MEM(BPF_B, skb_reg, tmp_reg,
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SKB_MONO_DELIVERY_TIME_OFFSET);
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*insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg, TC_AT_INGRESS_OFFSET);
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*insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg, TC_AT_INGRESS_MASK);
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*insn++ = BPF_JMP32_IMM(BPF_JEQ, tmp_reg, 0, 3);
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/* Writing __sk_buff->tstamp at ingress as the (rcv) timestamp.
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* Clear the skb->mono_delivery_time.
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*/
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*insn++ = BPF_LDX_MEM(BPF_B, tmp_reg, skb_reg,
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SKB_MONO_DELIVERY_TIME_OFFSET);
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*insn++ = BPF_ALU32_IMM(BPF_AND, tmp_reg,
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~SKB_MONO_DELIVERY_TIME_MASK);
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*insn++ = BPF_STX_MEM(BPF_B, skb_reg, tmp_reg,
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SKB_MONO_DELIVERY_TIME_OFFSET);
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}
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#endif
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/* skb->tstamp = tstamp */
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@ -9226,9 +9321,13 @@ static u32 bpf_convert_ctx_access(enum bpf_access_type type,
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BUILD_BUG_ON(sizeof_field(struct sk_buff, tstamp) != 8);
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if (type == BPF_WRITE)
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insn = bpf_convert_tstamp_write(si, insn);
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insn = bpf_convert_tstamp_write(prog, si, insn);
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else
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insn = bpf_convert_tstamp_read(si, insn);
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insn = bpf_convert_tstamp_read(prog, si, insn);
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break;
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case offsetof(struct __sk_buff, delivery_time_type):
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insn = bpf_convert_dtime_type_read(si, insn);
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break;
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case offsetof(struct __sk_buff, gso_segs):
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|
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|
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@ -5086,6 +5086,37 @@ union bpf_attr {
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* Return
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* 0 on success, or a negative error in case of failure. On error
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* *dst* buffer is zeroed out.
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*
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* long bpf_skb_set_delivery_time(struct sk_buff *skb, u64 dtime, u32 dtime_type)
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* Description
|
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* Set a *dtime* (delivery time) to the __sk_buff->tstamp and also
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* change the __sk_buff->delivery_time_type to *dtime_type*.
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*
|
||||
* When setting a delivery time (non zero *dtime*) to
|
||||
* __sk_buff->tstamp, only BPF_SKB_DELIVERY_TIME_MONO *dtime_type*
|
||||
* is supported. It is the only delivery_time_type that will be
|
||||
* kept after bpf_redirect_*().
|
||||
*
|
||||
* If there is no need to change the __sk_buff->delivery_time_type,
|
||||
* the delivery time can be directly written to __sk_buff->tstamp
|
||||
* instead.
|
||||
*
|
||||
* *dtime* 0 and *dtime_type* BPF_SKB_DELIVERY_TIME_NONE
|
||||
* can be used to clear any delivery time stored in
|
||||
* __sk_buff->tstamp.
|
||||
*
|
||||
* Only IPv4 and IPv6 skb->protocol are supported.
|
||||
*
|
||||
* This function is most useful when it needs to set a
|
||||
* mono delivery time to __sk_buff->tstamp and then
|
||||
* bpf_redirect_*() to the egress of an iface. For example,
|
||||
* changing the (rcv) timestamp in __sk_buff->tstamp at
|
||||
* ingress to a mono delivery time and then bpf_redirect_*()
|
||||
* to sch_fq@phy-dev.
|
||||
* Return
|
||||
* 0 on success.
|
||||
* **-EINVAL** for invalid input
|
||||
* **-EOPNOTSUPP** for unsupported delivery_time_type and protocol
|
||||
*/
|
||||
#define __BPF_FUNC_MAPPER(FN) \
|
||||
FN(unspec), \
|
||||
|
|
@ -5280,6 +5311,7 @@ union bpf_attr {
|
|||
FN(xdp_load_bytes), \
|
||||
FN(xdp_store_bytes), \
|
||||
FN(copy_from_user_task), \
|
||||
FN(skb_set_delivery_time), \
|
||||
/* */
|
||||
|
||||
/* integer value in 'imm' field of BPF_CALL instruction selects which helper
|
||||
|
|
@ -5469,6 +5501,12 @@ union { \
|
|||
__u64 :64; \
|
||||
} __attribute__((aligned(8)))
|
||||
|
||||
enum {
|
||||
BPF_SKB_DELIVERY_TIME_NONE,
|
||||
BPF_SKB_DELIVERY_TIME_UNSPEC,
|
||||
BPF_SKB_DELIVERY_TIME_MONO,
|
||||
};
|
||||
|
||||
/* user accessible mirror of in-kernel sk_buff.
|
||||
* new fields can only be added to the end of this structure
|
||||
*/
|
||||
|
|
@ -5509,7 +5547,8 @@ struct __sk_buff {
|
|||
__u32 gso_segs;
|
||||
__bpf_md_ptr(struct bpf_sock *, sk);
|
||||
__u32 gso_size;
|
||||
__u32 :32; /* Padding, future use. */
|
||||
__u8 delivery_time_type;
|
||||
__u32 :24; /* Padding, future use. */
|
||||
__u64 hwtstamp;
|
||||
};
|
||||
|
||||
|
|
|
|||
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