From bd4aed0ee73ca873bef3cb3ec746dd796f03df28 Mon Sep 17 00:00:00 2001 From: Jiong Wang Date: Mon, 11 Feb 2019 12:01:20 +0000 Subject: selftests: bpf: centre kernel bpf objects under new subdir "progs" At the moment, all kernel bpf objects are listed under BPF_OBJ_FILES. Listing them manually sometimes causing patch conflict when people are adding new testcases simultaneously. It is better to centre all the related source files under a subdir "progs", then auto-generate the object file list. Suggested-by: Alexei Starovoitov Reviewed-by: Jakub Kicinski Signed-off-by: Jiong Wang Signed-off-by: Alexei Starovoitov --- tools/testing/selftests/bpf/test_lwt_seg6local.c | 437 ----------------------- 1 file changed, 437 deletions(-) delete mode 100644 tools/testing/selftests/bpf/test_lwt_seg6local.c (limited to 'tools/testing/selftests/bpf/test_lwt_seg6local.c') diff --git a/tools/testing/selftests/bpf/test_lwt_seg6local.c b/tools/testing/selftests/bpf/test_lwt_seg6local.c deleted file mode 100644 index 0575751bc1bc..000000000000 --- a/tools/testing/selftests/bpf/test_lwt_seg6local.c +++ /dev/null @@ -1,437 +0,0 @@ -#include -#include -#include -#include -#include -#include "bpf_helpers.h" -#include "bpf_endian.h" - -#define bpf_printk(fmt, ...) \ -({ \ - char ____fmt[] = fmt; \ - bpf_trace_printk(____fmt, sizeof(____fmt), \ - ##__VA_ARGS__); \ -}) - -/* Packet parsing state machine helpers. */ -#define cursor_advance(_cursor, _len) \ - ({ void *_tmp = _cursor; _cursor += _len; _tmp; }) - -#define SR6_FLAG_ALERT (1 << 4) - -#define htonll(x) ((bpf_htonl(1)) == 1 ? (x) : ((uint64_t)bpf_htonl((x) & \ - 0xFFFFFFFF) << 32) | bpf_htonl((x) >> 32)) -#define ntohll(x) ((bpf_ntohl(1)) == 1 ? (x) : ((uint64_t)bpf_ntohl((x) & \ - 0xFFFFFFFF) << 32) | bpf_ntohl((x) >> 32)) -#define BPF_PACKET_HEADER __attribute__((packed)) - -struct ip6_t { - unsigned int ver:4; - unsigned int priority:8; - unsigned int flow_label:20; - unsigned short payload_len; - unsigned char next_header; - unsigned char hop_limit; - unsigned long long src_hi; - unsigned long long src_lo; - unsigned long long dst_hi; - unsigned long long dst_lo; -} BPF_PACKET_HEADER; - -struct ip6_addr_t { - unsigned long long hi; - unsigned long long lo; -} BPF_PACKET_HEADER; - -struct ip6_srh_t { - unsigned char nexthdr; - unsigned char hdrlen; - unsigned char type; - unsigned char segments_left; - unsigned char first_segment; - unsigned char flags; - unsigned short tag; - - struct ip6_addr_t segments[0]; -} BPF_PACKET_HEADER; - -struct sr6_tlv_t { - unsigned char type; - unsigned char len; - unsigned char value[0]; -} BPF_PACKET_HEADER; - -__attribute__((always_inline)) struct ip6_srh_t *get_srh(struct __sk_buff *skb) -{ - void *cursor, *data_end; - struct ip6_srh_t *srh; - struct ip6_t *ip; - uint8_t *ipver; - - data_end = (void *)(long)skb->data_end; - cursor = (void *)(long)skb->data; - ipver = (uint8_t *)cursor; - - if ((void *)ipver + sizeof(*ipver) > data_end) - return NULL; - - if ((*ipver >> 4) != 6) - return NULL; - - ip = cursor_advance(cursor, sizeof(*ip)); - if ((void *)ip + sizeof(*ip) > data_end) - return NULL; - - if (ip->next_header != 43) - return NULL; - - srh = cursor_advance(cursor, sizeof(*srh)); - if ((void *)srh + sizeof(*srh) > data_end) - return NULL; - - if (srh->type != 4) - return NULL; - - return srh; -} - -__attribute__((always_inline)) -int update_tlv_pad(struct __sk_buff *skb, uint32_t new_pad, - uint32_t old_pad, uint32_t pad_off) -{ - int err; - - if (new_pad != old_pad) { - err = bpf_lwt_seg6_adjust_srh(skb, pad_off, - (int) new_pad - (int) old_pad); - if (err) - return err; - } - - if (new_pad > 0) { - char pad_tlv_buf[16] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0}; - struct sr6_tlv_t *pad_tlv = (struct sr6_tlv_t *) pad_tlv_buf; - - pad_tlv->type = SR6_TLV_PADDING; - pad_tlv->len = new_pad - 2; - - err = bpf_lwt_seg6_store_bytes(skb, pad_off, - (void *)pad_tlv_buf, new_pad); - if (err) - return err; - } - - return 0; -} - -__attribute__((always_inline)) -int is_valid_tlv_boundary(struct __sk_buff *skb, struct ip6_srh_t *srh, - uint32_t *tlv_off, uint32_t *pad_size, - uint32_t *pad_off) -{ - uint32_t srh_off, cur_off; - int offset_valid = 0; - int err; - - srh_off = (char *)srh - (char *)(long)skb->data; - // cur_off = end of segments, start of possible TLVs - cur_off = srh_off + sizeof(*srh) + - sizeof(struct ip6_addr_t) * (srh->first_segment + 1); - - *pad_off = 0; - - // we can only go as far as ~10 TLVs due to the BPF max stack size - #pragma clang loop unroll(full) - for (int i = 0; i < 10; i++) { - struct sr6_tlv_t tlv; - - if (cur_off == *tlv_off) - offset_valid = 1; - - if (cur_off >= srh_off + ((srh->hdrlen + 1) << 3)) - break; - - err = bpf_skb_load_bytes(skb, cur_off, &tlv, sizeof(tlv)); - if (err) - return err; - - if (tlv.type == SR6_TLV_PADDING) { - *pad_size = tlv.len + sizeof(tlv); - *pad_off = cur_off; - - if (*tlv_off == srh_off) { - *tlv_off = cur_off; - offset_valid = 1; - } - break; - - } else if (tlv.type == SR6_TLV_HMAC) { - break; - } - - cur_off += sizeof(tlv) + tlv.len; - } // we reached the padding or HMAC TLVs, or the end of the SRH - - if (*pad_off == 0) - *pad_off = cur_off; - - if (*tlv_off == -1) - *tlv_off = cur_off; - else if (!offset_valid) - return -EINVAL; - - return 0; -} - -__attribute__((always_inline)) -int add_tlv(struct __sk_buff *skb, struct ip6_srh_t *srh, uint32_t tlv_off, - struct sr6_tlv_t *itlv, uint8_t tlv_size) -{ - uint32_t srh_off = (char *)srh - (char *)(long)skb->data; - uint8_t len_remaining, new_pad; - uint32_t pad_off = 0; - uint32_t pad_size = 0; - uint32_t partial_srh_len; - int err; - - if (tlv_off != -1) - tlv_off += srh_off; - - if (itlv->type == SR6_TLV_PADDING || itlv->type == SR6_TLV_HMAC) - return -EINVAL; - - err = is_valid_tlv_boundary(skb, srh, &tlv_off, &pad_size, &pad_off); - if (err) - return err; - - err = bpf_lwt_seg6_adjust_srh(skb, tlv_off, sizeof(*itlv) + itlv->len); - if (err) - return err; - - err = bpf_lwt_seg6_store_bytes(skb, tlv_off, (void *)itlv, tlv_size); - if (err) - return err; - - // the following can't be moved inside update_tlv_pad because the - // bpf verifier has some issues with it - pad_off += sizeof(*itlv) + itlv->len; - partial_srh_len = pad_off - srh_off; - len_remaining = partial_srh_len % 8; - new_pad = 8 - len_remaining; - - if (new_pad == 1) // cannot pad for 1 byte only - new_pad = 9; - else if (new_pad == 8) - new_pad = 0; - - return update_tlv_pad(skb, new_pad, pad_size, pad_off); -} - -__attribute__((always_inline)) -int delete_tlv(struct __sk_buff *skb, struct ip6_srh_t *srh, - uint32_t tlv_off) -{ - uint32_t srh_off = (char *)srh - (char *)(long)skb->data; - uint8_t len_remaining, new_pad; - uint32_t partial_srh_len; - uint32_t pad_off = 0; - uint32_t pad_size = 0; - struct sr6_tlv_t tlv; - int err; - - tlv_off += srh_off; - - err = is_valid_tlv_boundary(skb, srh, &tlv_off, &pad_size, &pad_off); - if (err) - return err; - - err = bpf_skb_load_bytes(skb, tlv_off, &tlv, sizeof(tlv)); - if (err) - return err; - - err = bpf_lwt_seg6_adjust_srh(skb, tlv_off, -(sizeof(tlv) + tlv.len)); - if (err) - return err; - - pad_off -= sizeof(tlv) + tlv.len; - partial_srh_len = pad_off - srh_off; - len_remaining = partial_srh_len % 8; - new_pad = 8 - len_remaining; - if (new_pad == 1) // cannot pad for 1 byte only - new_pad = 9; - else if (new_pad == 8) - new_pad = 0; - - return update_tlv_pad(skb, new_pad, pad_size, pad_off); -} - -__attribute__((always_inline)) -int has_egr_tlv(struct __sk_buff *skb, struct ip6_srh_t *srh) -{ - int tlv_offset = sizeof(struct ip6_t) + sizeof(struct ip6_srh_t) + - ((srh->first_segment + 1) << 4); - struct sr6_tlv_t tlv; - - if (bpf_skb_load_bytes(skb, tlv_offset, &tlv, sizeof(struct sr6_tlv_t))) - return 0; - - if (tlv.type == SR6_TLV_EGRESS && tlv.len == 18) { - struct ip6_addr_t egr_addr; - - if (bpf_skb_load_bytes(skb, tlv_offset + 4, &egr_addr, 16)) - return 0; - - // check if egress TLV value is correct - if (ntohll(egr_addr.hi) == 0xfd00000000000000 && - ntohll(egr_addr.lo) == 0x4) - return 1; - } - - return 0; -} - -// This function will push a SRH with segments fd00::1, fd00::2, fd00::3, -// fd00::4 -SEC("encap_srh") -int __encap_srh(struct __sk_buff *skb) -{ - unsigned long long hi = 0xfd00000000000000; - struct ip6_addr_t *seg; - struct ip6_srh_t *srh; - char srh_buf[72]; // room for 4 segments - int err; - - srh = (struct ip6_srh_t *)srh_buf; - srh->nexthdr = 0; - srh->hdrlen = 8; - srh->type = 4; - srh->segments_left = 3; - srh->first_segment = 3; - srh->flags = 0; - srh->tag = 0; - - seg = (struct ip6_addr_t *)((char *)srh + sizeof(*srh)); - - #pragma clang loop unroll(full) - for (unsigned long long lo = 0; lo < 4; lo++) { - seg->lo = htonll(4 - lo); - seg->hi = htonll(hi); - seg = (struct ip6_addr_t *)((char *)seg + sizeof(*seg)); - } - - err = bpf_lwt_push_encap(skb, 0, (void *)srh, sizeof(srh_buf)); - if (err) - return BPF_DROP; - - return BPF_REDIRECT; -} - -// Add an Egress TLV fc00::4, add the flag A, -// and apply End.X action to fc42::1 -SEC("add_egr_x") -int __add_egr_x(struct __sk_buff *skb) -{ - unsigned long long hi = 0xfc42000000000000; - unsigned long long lo = 0x1; - struct ip6_srh_t *srh = get_srh(skb); - uint8_t new_flags = SR6_FLAG_ALERT; - struct ip6_addr_t addr; - int err, offset; - - if (srh == NULL) - return BPF_DROP; - - uint8_t tlv[20] = {2, 18, 0, 0, 0xfd, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, - 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x4}; - - err = add_tlv(skb, srh, (srh->hdrlen+1) << 3, - (struct sr6_tlv_t *)&tlv, 20); - if (err) - return BPF_DROP; - - offset = sizeof(struct ip6_t) + offsetof(struct ip6_srh_t, flags); - err = bpf_lwt_seg6_store_bytes(skb, offset, - (void *)&new_flags, sizeof(new_flags)); - if (err) - return BPF_DROP; - - addr.lo = htonll(lo); - addr.hi = htonll(hi); - err = bpf_lwt_seg6_action(skb, SEG6_LOCAL_ACTION_END_X, - (void *)&addr, sizeof(addr)); - if (err) - return BPF_DROP; - return BPF_REDIRECT; -} - -// Pop the Egress TLV, reset the flags, change the tag 2442 and finally do a -// simple End action -SEC("pop_egr") -int __pop_egr(struct __sk_buff *skb) -{ - struct ip6_srh_t *srh = get_srh(skb); - uint16_t new_tag = bpf_htons(2442); - uint8_t new_flags = 0; - int err, offset; - - if (srh == NULL) - return BPF_DROP; - - if (srh->flags != SR6_FLAG_ALERT) - return BPF_DROP; - - if (srh->hdrlen != 11) // 4 segments + Egress TLV + Padding TLV - return BPF_DROP; - - if (!has_egr_tlv(skb, srh)) - return BPF_DROP; - - err = delete_tlv(skb, srh, 8 + (srh->first_segment + 1) * 16); - if (err) - return BPF_DROP; - - offset = sizeof(struct ip6_t) + offsetof(struct ip6_srh_t, flags); - if (bpf_lwt_seg6_store_bytes(skb, offset, (void *)&new_flags, - sizeof(new_flags))) - return BPF_DROP; - - offset = sizeof(struct ip6_t) + offsetof(struct ip6_srh_t, tag); - if (bpf_lwt_seg6_store_bytes(skb, offset, (void *)&new_tag, - sizeof(new_tag))) - return BPF_DROP; - - return BPF_OK; -} - -// Inspect if the Egress TLV and flag have been removed, if the tag is correct, -// then apply a End.T action to reach the last segment -SEC("inspect_t") -int __inspect_t(struct __sk_buff *skb) -{ - struct ip6_srh_t *srh = get_srh(skb); - int table = 117; - int err; - - if (srh == NULL) - return BPF_DROP; - - if (srh->flags != 0) - return BPF_DROP; - - if (srh->tag != bpf_htons(2442)) - return BPF_DROP; - - if (srh->hdrlen != 8) // 4 segments - return BPF_DROP; - - err = bpf_lwt_seg6_action(skb, SEG6_LOCAL_ACTION_END_T, - (void *)&table, sizeof(table)); - - if (err) - return BPF_DROP; - - return BPF_REDIRECT; -} - -char __license[] SEC("license") = "GPL"; -- cgit v1.2.3