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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,84 @@ | ||
| #include "vmlinux.h" | ||
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|
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| #include <bpf/bpf_helpers.h> | ||
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|
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| #include "common/try.h" | ||
| #include "kmod/mimic.h" | ||
| #include "mimic.h" | ||
|
|
||
| _mimic_maybe_static_inline int send_ctrl_packet(struct conn_tuple* conn, __u16 flags, __u32 seq, __u32 ack_seq, __u32 cwnd) { | ||
| if (!conn) return -1; | ||
| struct rb_item* item = bpf_ringbuf_reserve(&mimic_rb, sizeof(*item), 0); | ||
| if (!item) return -1; | ||
| item->type = RB_ITEM_SEND_OPTIONS; | ||
| item->send_options = (struct send_options){ | ||
| .conn = *conn, | ||
| .syn = flags & SYN, | ||
| .ack = flags & ACK, | ||
| .rst = flags & RST, | ||
| .seq = seq, | ||
| .ack_seq = ack_seq, | ||
| .cwnd = cwnd, | ||
| }; | ||
| bpf_ringbuf_submit(item, 0); | ||
| return 0; | ||
| } | ||
|
|
||
| _mimic_maybe_static_inline int store_packet(struct __sk_buff* skb, __u32 pkt_off, struct conn_tuple* key) { | ||
| int retcode; | ||
| __u32 data_len = skb->len - pkt_off; | ||
| if (!key || data_len > MAX_PACKET_SIZE) return TC_ACT_SHOT; | ||
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|
||
| bool has_remainder = data_len % SEGMENT_SIZE; | ||
| __u32 segments = data_len / SEGMENT_SIZE + has_remainder; | ||
| __u32 alloc_size = sizeof(struct rb_item) + segments * SEGMENT_SIZE; | ||
| struct bpf_dynptr ptr = {}; | ||
| if (bpf_ringbuf_reserve_dynptr(&mimic_rb, alloc_size, 0, &ptr) < 0) cleanup(TC_ACT_SHOT); | ||
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| struct rb_item* item = bpf_dynptr_data(&ptr, 0, sizeof(*item)); | ||
| if (!item) cleanup(TC_ACT_SHOT); | ||
| item->type = RB_ITEM_STORE_PACKET; | ||
| item->store_packet.conn_key = *key; | ||
| item->store_packet.len = data_len; | ||
| item->store_packet.l4_csum_partial = mimic_inspect_skb(skb)->ip_summed == CHECKSUM_PARTIAL; | ||
|
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| char* packet = NULL; | ||
| __u32 offset = 0, i = 0; | ||
| for (; i < segments - has_remainder; i++) { | ||
| if (i > MAX_PACKET_SIZE / SEGMENT_SIZE + 1) break; | ||
| offset = i * SEGMENT_SIZE; | ||
| packet = bpf_dynptr_data(&ptr, sizeof(*item) + offset, SEGMENT_SIZE); | ||
| if (!packet) cleanup(TC_ACT_SHOT); | ||
| if (bpf_skb_load_bytes(skb, pkt_off + offset, packet, SEGMENT_SIZE) < 0) cleanup(TC_ACT_SHOT); | ||
| } | ||
| if (has_remainder) { | ||
| offset = i * SEGMENT_SIZE; | ||
| __u32 copy_len = data_len - offset; | ||
| if (copy_len > 0 && copy_len < SEGMENT_SIZE) { | ||
| // HACK: see above | ||
| if (copy_len < 2) copy_len = 1; | ||
| if (copy_len > SEGMENT_SIZE - 2) copy_len = SEGMENT_SIZE - 1; | ||
|
|
||
| packet = bpf_dynptr_data(&ptr, sizeof(*item) + offset, SEGMENT_SIZE); | ||
| if (!packet) cleanup(TC_ACT_SHOT); | ||
| if (bpf_skb_load_bytes(skb, pkt_off + offset, packet, copy_len) < 0) cleanup(TC_ACT_SHOT); | ||
| } | ||
| } | ||
| bpf_ringbuf_submit_dynptr(&ptr, 0); | ||
| return TC_ACT_STOLEN; | ||
| cleanup: | ||
| bpf_ringbuf_discard_dynptr(&ptr, 0); | ||
| return retcode; | ||
| } | ||
|
|
||
| // Need to manually clear conn.pktbuf in eBPF | ||
| _mimic_maybe_static_inline int use_pktbuf(enum rb_item_type type, uintptr_t buf) { | ||
| if (type != RB_ITEM_CONSUME_PKTBUF && type != RB_ITEM_FREE_PKTBUF) return -1; | ||
| if (!buf) return 0; | ||
| struct rb_item* item = bpf_ringbuf_reserve(&mimic_rb, sizeof(*item), 0); | ||
| if (!item) return -1; | ||
| item->type = type; | ||
| item->pktbuf = buf; | ||
| bpf_ringbuf_submit(item, 0); | ||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,92 +1,15 @@ | ||
| #include "vmlinux.h" | ||
| #include "vmlinux.h" // IWYU pragma: keep | ||
|
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| #include <bpf/bpf_helpers.h> | ||
|
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| #include "common/try.h" | ||
| #include "kmod/mimic.h" | ||
| #include "mimic.h" | ||
|
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| int log_verbosity = 0; | ||
|
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| struct mimic_whitelist_map mimic_whitelist SEC(".maps"); | ||
| struct mimic_conns_map mimic_conns SEC(".maps"); | ||
| struct mimic_rb_map mimic_rb SEC(".maps"); | ||
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| int send_ctrl_packet(struct conn_tuple* conn, __u16 flags, __u32 seq, __u32 ack_seq, __u32 cwnd) { | ||
| if (!conn) return -1; | ||
| struct rb_item* item = bpf_ringbuf_reserve(&mimic_rb, sizeof(*item), 0); | ||
| if (!item) return -1; | ||
| item->type = RB_ITEM_SEND_OPTIONS; | ||
| item->send_options = (struct send_options){ | ||
| .conn = *conn, | ||
| .syn = flags & SYN, | ||
| .ack = flags & ACK, | ||
| .rst = flags & RST, | ||
| .seq = seq, | ||
| .ack_seq = ack_seq, | ||
| .cwnd = cwnd, | ||
| }; | ||
| bpf_ringbuf_submit(item, 0); | ||
| return 0; | ||
| } | ||
|
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| int store_packet(struct __sk_buff* skb, __u32 pkt_off, struct conn_tuple* key) { | ||
| int retcode; | ||
| __u32 data_len = skb->len - pkt_off; | ||
| if (!key || data_len > MAX_PACKET_SIZE) return TC_ACT_SHOT; | ||
|
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||
| bool has_remainder = data_len % SEGMENT_SIZE; | ||
| __u32 segments = data_len / SEGMENT_SIZE + has_remainder; | ||
| __u32 alloc_size = sizeof(struct rb_item) + segments * SEGMENT_SIZE; | ||
| struct bpf_dynptr ptr = {}; | ||
| if (bpf_ringbuf_reserve_dynptr(&mimic_rb, alloc_size, 0, &ptr) < 0) cleanup(TC_ACT_SHOT); | ||
|
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| struct rb_item* item = bpf_dynptr_data(&ptr, 0, sizeof(*item)); | ||
| if (!item) cleanup(TC_ACT_SHOT); | ||
| item->type = RB_ITEM_STORE_PACKET; | ||
| item->store_packet.conn_key = *key; | ||
| item->store_packet.len = data_len; | ||
| item->store_packet.l4_csum_partial = mimic_inspect_skb(skb)->ip_summed == CHECKSUM_PARTIAL; | ||
|
|
||
| char* packet = NULL; | ||
| __u32 offset = 0, i = 0; | ||
| for (; i < segments - has_remainder; i++) { | ||
| if (i > MAX_PACKET_SIZE / SEGMENT_SIZE + 1) break; | ||
| offset = i * SEGMENT_SIZE; | ||
| packet = bpf_dynptr_data(&ptr, sizeof(*item) + offset, SEGMENT_SIZE); | ||
| if (!packet) cleanup(TC_ACT_SHOT); | ||
| if (bpf_skb_load_bytes(skb, pkt_off + offset, packet, SEGMENT_SIZE) < 0) cleanup(TC_ACT_SHOT); | ||
| } | ||
| if (has_remainder) { | ||
| offset = i * SEGMENT_SIZE; | ||
| __u32 copy_len = data_len - offset; | ||
| if (copy_len > 0 && copy_len < SEGMENT_SIZE) { | ||
| // HACK: see above | ||
| if (copy_len < 2) copy_len = 1; | ||
| if (copy_len > SEGMENT_SIZE - 2) copy_len = SEGMENT_SIZE - 1; | ||
|
|
||
| packet = bpf_dynptr_data(&ptr, sizeof(*item) + offset, SEGMENT_SIZE); | ||
| if (!packet) cleanup(TC_ACT_SHOT); | ||
| if (bpf_skb_load_bytes(skb, pkt_off + offset, packet, copy_len) < 0) cleanup(TC_ACT_SHOT); | ||
| } | ||
| } | ||
| bpf_ringbuf_submit_dynptr(&ptr, 0); | ||
| return TC_ACT_STOLEN; | ||
| cleanup: | ||
| bpf_ringbuf_discard_dynptr(&ptr, 0); | ||
| return retcode; | ||
| } | ||
|
|
||
| // Need to manually clear conn.pktbuf in eBPF | ||
| int use_pktbuf(enum rb_item_type type, uintptr_t buf) { | ||
| if (type != RB_ITEM_CONSUME_PKTBUF && type != RB_ITEM_FREE_PKTBUF) return -1; | ||
| if (!buf) return 0; | ||
| struct rb_item* item = bpf_ringbuf_reserve(&mimic_rb, sizeof(*item), 0); | ||
| if (!item) return -1; | ||
| item->type = type; | ||
| item->pktbuf = buf; | ||
| bpf_ringbuf_submit(item, 0); | ||
| return 0; | ||
| } | ||
| #ifndef _MIMIC_BPF_INLINE_ALL_FUNCS | ||
| #include "mimic-impl.h" // IWYU pragma: export | ||
| #endif | ||
|
|
||
| char _license[] SEC("license") = "GPL"; |
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