From 0dcbbf6785799ba05b44df2ba6bcc1195f4f945c Mon Sep 17 00:00:00 2001 From: John Fastabend Date: Sun, 18 Mar 2018 12:58:12 -0700 Subject: bpf: sockmap sample test for bpf_msg_pull_data This adds an option to test the msg_pull_data helper. This uses two options txmsg_start and txmsg_end to let the user specify start and end bytes to pull. The options can be used with txmsg_apply, txmsg_cork options as well as with any of the basic tests, txmsg, txmsg_redir and txmsg_drop (plus noisy variants) to run pull_data inline with those tests. By giving user direct control over the variables we can easily do negative testing as well as positive tests. Signed-off-by: John Fastabend Acked-by: David S. Miller Signed-off-by: Daniel Borkmann --- samples/sockmap/sockmap_kern.c | 79 ++++++++++++++++++++++++++++++++++-------- samples/sockmap/sockmap_user.c | 32 +++++++++++++++++ 2 files changed, 97 insertions(+), 14 deletions(-) (limited to 'samples/sockmap') diff --git a/samples/sockmap/sockmap_kern.c b/samples/sockmap/sockmap_kern.c index 8b6c34cd5f46..9ad5ba79c85a 100644 --- a/samples/sockmap/sockmap_kern.c +++ b/samples/sockmap/sockmap_kern.c @@ -71,6 +71,14 @@ struct bpf_map_def SEC("maps") sock_cork_bytes = { .max_entries = 1 }; +struct bpf_map_def SEC("maps") sock_pull_bytes = { + .type = BPF_MAP_TYPE_ARRAY, + .key_size = sizeof(int), + .value_size = sizeof(int), + .max_entries = 2 +}; + + SEC("sk_skb1") int bpf_prog1(struct __sk_buff *skb) { @@ -137,7 +145,8 @@ int bpf_sockmap(struct bpf_sock_ops *skops) SEC("sk_msg1") int bpf_prog4(struct sk_msg_md *msg) { - int *bytes, zero = 0; + int *bytes, zero = 0, one = 1; + int *start, *end; bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero); if (bytes) @@ -145,15 +154,18 @@ int bpf_prog4(struct sk_msg_md *msg) bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero); if (bytes) bpf_msg_cork_bytes(msg, *bytes); + start = bpf_map_lookup_elem(&sock_pull_bytes, &zero); + end = bpf_map_lookup_elem(&sock_pull_bytes, &one); + if (start && end) + bpf_msg_pull_data(msg, *start, *end, 0); return SK_PASS; } SEC("sk_msg2") int bpf_prog5(struct sk_msg_md *msg) { - void *data_end = (void *)(long) msg->data_end; - void *data = (void *)(long) msg->data; - int *bytes, err1 = -1, err2 = -1, zero = 0; + int err1 = -1, err2 = -1, zero = 0, one = 1; + int *bytes, *start, *end, len1, len2; bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero); if (bytes) @@ -161,17 +173,32 @@ int bpf_prog5(struct sk_msg_md *msg) bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero); if (bytes) err2 = bpf_msg_cork_bytes(msg, *bytes); + len1 = (__u64)msg->data_end - (__u64)msg->data; + start = bpf_map_lookup_elem(&sock_pull_bytes, &zero); + end = bpf_map_lookup_elem(&sock_pull_bytes, &one); + if (start && end) { + int err; + + bpf_printk("sk_msg2: pull(%i:%i)\n", + start ? *start : 0, end ? *end : 0); + err = bpf_msg_pull_data(msg, *start, *end, 0); + if (err) + bpf_printk("sk_msg2: pull_data err %i\n", + err); + len2 = (__u64)msg->data_end - (__u64)msg->data; + bpf_printk("sk_msg2: length update %i->%i\n", + len1, len2); + } bpf_printk("sk_msg2: data length %i err1 %i err2 %i\n", - (__u64)data_end - (__u64)data, err1, err2); + len1, err1, err2); return SK_PASS; } SEC("sk_msg3") int bpf_prog6(struct sk_msg_md *msg) { - void *data_end = (void *)(long) msg->data_end; - void *data = (void *)(long) msg->data; - int *bytes, zero = 0; + int *bytes, zero = 0, one = 1; + int *start, *end; bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero); if (bytes) @@ -179,15 +206,18 @@ int bpf_prog6(struct sk_msg_md *msg) bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero); if (bytes) bpf_msg_cork_bytes(msg, *bytes); + start = bpf_map_lookup_elem(&sock_pull_bytes, &zero); + end = bpf_map_lookup_elem(&sock_pull_bytes, &one); + if (start && end) + bpf_msg_pull_data(msg, *start, *end, 0); return bpf_msg_redirect_map(msg, &sock_map_redir, zero, 0); } SEC("sk_msg4") int bpf_prog7(struct sk_msg_md *msg) { - void *data_end = (void *)(long) msg->data_end; - void *data = (void *)(long) msg->data; - int *bytes, err1 = 0, err2 = 0, zero = 0; + int err1 = 0, err2 = 0, zero = 0, one = 1; + int *bytes, *start, *end, len1, len2; bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero); if (bytes) @@ -195,9 +225,24 @@ int bpf_prog7(struct sk_msg_md *msg) bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero); if (bytes) err2 = bpf_msg_cork_bytes(msg, *bytes); - + len1 = (__u64)msg->data_end - (__u64)msg->data; + start = bpf_map_lookup_elem(&sock_pull_bytes, &zero); + end = bpf_map_lookup_elem(&sock_pull_bytes, &one); + if (start && end) { + int err; + + bpf_printk("sk_msg2: pull(%i:%i)\n", + start ? *start : 0, end ? *end : 0); + err = bpf_msg_pull_data(msg, *start, *end, 0); + if (err) + bpf_printk("sk_msg2: pull_data err %i\n", + err); + len2 = (__u64)msg->data_end - (__u64)msg->data; + bpf_printk("sk_msg2: length update %i->%i\n", + len1, len2); + } bpf_printk("sk_msg3: redirect(%iB) err1=%i err2=%i\n", - (__u64)data_end - (__u64)data, err1, err2); + len1, err1, err2); return bpf_msg_redirect_map(msg, &sock_map_redir, zero, 0); } @@ -239,7 +284,8 @@ int bpf_prog9(struct sk_msg_md *msg) SEC("sk_msg7") int bpf_prog10(struct sk_msg_md *msg) { - int *bytes, zero = 0; + int *bytes, zero = 0, one = 1; + int *start, *end; bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero); if (bytes) @@ -247,6 +293,11 @@ int bpf_prog10(struct sk_msg_md *msg) bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero); if (bytes) bpf_msg_cork_bytes(msg, *bytes); + start = bpf_map_lookup_elem(&sock_pull_bytes, &zero); + end = bpf_map_lookup_elem(&sock_pull_bytes, &one); + if (start && end) + bpf_msg_pull_data(msg, *start, *end, 0); + return SK_DROP; } diff --git a/samples/sockmap/sockmap_user.c b/samples/sockmap/sockmap_user.c index 52c4ed7774d4..07aa237221d1 100644 --- a/samples/sockmap/sockmap_user.c +++ b/samples/sockmap/sockmap_user.c @@ -62,6 +62,8 @@ int txmsg_redir_noisy; int txmsg_drop; int txmsg_apply; int txmsg_cork; +int txmsg_start; +int txmsg_end; static const struct option long_options[] = { {"help", no_argument, NULL, 'h' }, @@ -79,6 +81,8 @@ static const struct option long_options[] = { {"txmsg_drop", no_argument, &txmsg_drop, 1 }, {"txmsg_apply", required_argument, NULL, 'a'}, {"txmsg_cork", required_argument, NULL, 'k'}, + {"txmsg_start", required_argument, NULL, 's'}, + {"txmsg_end", required_argument, NULL, 'e'}, {0, 0, NULL, 0 } }; @@ -572,6 +576,12 @@ int main(int argc, char **argv) while ((opt = getopt_long(argc, argv, ":dhvc:r:i:l:t:", long_options, &longindex)) != -1) { switch (opt) { + case 's': + txmsg_start = atoi(optarg); + break; + case 'e': + txmsg_end = atoi(optarg); + break; case 'a': txmsg_apply = atoi(optarg); break; @@ -761,6 +771,28 @@ run: } } + if (txmsg_start) { + err = bpf_map_update_elem(map_fd[5], + &i, &txmsg_start, BPF_ANY); + if (err) { + fprintf(stderr, + "ERROR: bpf_map_update_elem (txmsg_start): %d (%s)\n", + err, strerror(errno)); + return err; + } + } + + if (txmsg_end) { + i = 1; + err = bpf_map_update_elem(map_fd[5], + &i, &txmsg_end, BPF_ANY); + if (err) { + fprintf(stderr, + "ERROR: bpf_map_update_elem (txmsg_end): %d (%s)\n", + err, strerror(errno)); + return err; + } + } } if (txmsg_drop) -- cgit v1.2.3