crypto: tools - Add cryptostat userspace

This patch adds an userspace tool for displaying kernel crypto API
statistics.
Signed-off-by: Corentin Labbe <clabbe@baylibre.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

tools/crypto/getstat.c

+/* Heavily copied from libkcapi 2015 - 2017, Stephan Mueller <smueller@chronox.de> */
+#include <errno.h>
+#include <linux/cryptouser.h>
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+#define CR_RTA(x)  ((struct rtattr *)(((char *)(x)) + NLMSG_ALIGN(sizeof(struct crypto_user_alg))))
+
+static int get_stat(const char *drivername)
+{
+	struct {
+		struct nlmsghdr n;
+		struct crypto_user_alg cru;
+	} req;
+	struct sockaddr_nl nl;
+	int sd = 0, ret;
+	socklen_t addr_len;
+	struct iovec iov;
+	struct msghdr msg;
+	char buf[4096];
+	struct nlmsghdr *res_n = (struct nlmsghdr *)buf;
+	struct crypto_user_alg *cru_res = NULL;
+	int res_len = 0;
+	struct rtattr *tb[CRYPTOCFGA_MAX + 1];
+	struct rtattr *rta;
+	struct nlmsgerr *errmsg;
+
+	memset(&req, 0, sizeof(req));
+	memset(&buf, 0, sizeof(buf));
+	memset(&msg, 0, sizeof(msg));
+
+	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.cru));
+	req.n.nlmsg_flags = NLM_F_REQUEST;
+	req.n.nlmsg_type = CRYPTO_MSG_GETSTAT;
+	req.n.nlmsg_seq = time(NULL);
+
+	strncpy(req.cru.cru_driver_name, drivername, strlen(drivername));
+
+	sd =  socket(AF_NETLINK, SOCK_RAW, NETLINK_CRYPTO);
+	if (sd < 0) {
+		fprintf(stderr, "Netlink error: cannot open netlink socket");
+		return -errno;
+	}
+	memset(&nl, 0, sizeof(nl));
+	nl.nl_family = AF_NETLINK;
+	if (bind(sd, (struct sockaddr *)&nl, sizeof(nl)) < 0) {
+		ret = -errno;
+		fprintf(stderr, "Netlink error: cannot bind netlink socket");
+		goto out;
+	}
+
+	/* sanity check that netlink socket was successfully opened */
+	addr_len = sizeof(nl);
+	if (getsockname(sd, (struct sockaddr *)&nl, &addr_len) < 0) {
+		ret = -errno;
+		printf("Netlink error: cannot getsockname");
+		goto out;
+	}
+	if (addr_len != sizeof(nl)) {
+		ret = -errno;
+		printf("Netlink error: wrong address length %d", addr_len);
+		goto out;
+	}
+	if (nl.nl_family != AF_NETLINK) {
+		ret = -errno;
+		printf("Netlink error: wrong address family %d",
+				nl.nl_family);
+		goto out;
+	}
+
+	memset(&nl, 0, sizeof(nl));
+	nl.nl_family = AF_NETLINK;
+	iov.iov_base = (void *)&req.n;
+	iov.iov_len = req.n.nlmsg_len;
+	msg.msg_name = &nl;
+	msg.msg_namelen = sizeof(nl);
+	msg.msg_iov = &iov;
+	msg.msg_iovlen = 1;
+	if (sendmsg(sd, &msg, 0) < 0) {
+		ret = -errno;
+		printf("Netlink error: sendmsg failed");
+		goto out;
+	}
+	memset(buf, 0, sizeof(buf));
+	iov.iov_base = buf;
+	while (1) {
+		iov.iov_len = sizeof(buf);
+		ret = recvmsg(sd, &msg, 0);
+		if (ret < 0) {
+			if (errno == EINTR || errno == EAGAIN)
+				continue;
+			ret = -errno;
+			printf("Netlink error: netlink receive error");
+			goto out;
+		}
+		if (ret == 0) {
+			ret = -errno;
+			printf("Netlink error: no data");
+			goto out;
+		}
+		if (ret > sizeof(buf)) {
+			ret = -errno;
+			printf("Netlink error: received too much data");
+			goto out;
+		}
+		break;
+	}
+
+	ret = -EFAULT;
+	res_len = res_n->nlmsg_len;
+	if (res_n->nlmsg_type == NLMSG_ERROR) {
+		errmsg = NLMSG_DATA(res_n);
+		fprintf(stderr, "Fail with %d\n", errmsg->error);
+		ret = errmsg->error;
+		goto out;
+	}
+
+	if (res_n->nlmsg_type == CRYPTO_MSG_GETSTAT) {
+		cru_res = NLMSG_DATA(res_n);
+		res_len -= NLMSG_SPACE(sizeof(*cru_res));
+	}
+	if (res_len < 0) {
+		printf("Netlink error: nlmsg len %d\n", res_len);
+		goto out;
+	}
+
+	if (!cru_res) {
+		ret = -EFAULT;
+		printf("Netlink error: no cru_res\n");
+		goto out;
+	}
+
+	rta = CR_RTA(cru_res);
+	memset(tb, 0, sizeof(struct rtattr *) * (CRYPTOCFGA_MAX + 1));
+	while (RTA_OK(rta, res_len)) {
+		if ((rta->rta_type <= CRYPTOCFGA_MAX) && (!tb[rta->rta_type]))
+			tb[rta->rta_type] = rta;
+		rta = RTA_NEXT(rta, res_len);
+	}
+	if (res_len) {
+		printf("Netlink error: unprocessed data %d",
+				res_len);
+		goto out;
+	}
+
+	if (tb[CRYPTOCFGA_STAT_HASH]) {
+		struct rtattr *rta = tb[CRYPTOCFGA_STAT_HASH];
+		struct crypto_stat *rhash =
+			(struct crypto_stat *)RTA_DATA(rta);
+		printf("%s\tHash\n\tHash: %u bytes: %llu\n\tErrors: %u\n",
+			drivername,
+			rhash->stat_hash_cnt, rhash->stat_hash_tlen,
+			rhash->stat_hash_err_cnt);
+	} else if (tb[CRYPTOCFGA_STAT_COMPRESS]) {
+		struct rtattr *rta = tb[CRYPTOCFGA_STAT_COMPRESS];
+		struct crypto_stat *rblk =
+			(struct crypto_stat *)RTA_DATA(rta);
+		printf("%s\tCompress\n\tCompress: %u bytes: %llu\n\tDecompress: %u bytes: %llu\n\tErrors: %u\n",
+			drivername,
+			rblk->stat_compress_cnt, rblk->stat_compress_tlen,
+			rblk->stat_decompress_cnt, rblk->stat_decompress_tlen,
+			rblk->stat_compress_err_cnt);
+	} else if (tb[CRYPTOCFGA_STAT_ACOMP]) {
+		struct rtattr *rta = tb[CRYPTOCFGA_STAT_ACOMP];
+		struct crypto_stat *rcomp =
+			(struct crypto_stat *)RTA_DATA(rta);
+		printf("%s\tACompress\n\tCompress: %u bytes: %llu\n\tDecompress: %u bytes: %llu\n\tErrors: %u\n",
+			drivername,
+			rcomp->stat_compress_cnt, rcomp->stat_compress_tlen,
+			rcomp->stat_decompress_cnt, rcomp->stat_decompress_tlen,
+			rcomp->stat_compress_err_cnt);
+	} else if (tb[CRYPTOCFGA_STAT_AEAD]) {
+		struct rtattr *rta = tb[CRYPTOCFGA_STAT_AEAD];
+		struct crypto_stat *raead =
+			(struct crypto_stat *)RTA_DATA(rta);
+		printf("%s\tAEAD\n\tEncrypt: %u bytes: %llu\n\tDecrypt: %u bytes: %llu\n\tErrors: %u\n",
+			drivername,
+			raead->stat_encrypt_cnt, raead->stat_encrypt_tlen,
+			raead->stat_decrypt_cnt, raead->stat_decrypt_tlen,
+			raead->stat_aead_err_cnt);
+	} else if (tb[CRYPTOCFGA_STAT_BLKCIPHER]) {
+		struct rtattr *rta = tb[CRYPTOCFGA_STAT_BLKCIPHER];
+		struct crypto_stat *rblk =
+			(struct crypto_stat *)RTA_DATA(rta);
+		printf("%s\tCipher\n\tEncrypt: %u bytes: %llu\n\tDecrypt: %u bytes: %llu\n\tErrors: %u\n",
+			drivername,
+			rblk->stat_encrypt_cnt, rblk->stat_encrypt_tlen,
+			rblk->stat_decrypt_cnt, rblk->stat_decrypt_tlen,
+			rblk->stat_cipher_err_cnt);
+	} else if (tb[CRYPTOCFGA_STAT_AKCIPHER]) {
+		struct rtattr *rta = tb[CRYPTOCFGA_STAT_AKCIPHER];
+		struct crypto_stat *rblk =
+			(struct crypto_stat *)RTA_DATA(rta);
+		printf("%s\tAkcipher\n\tEncrypt: %u bytes: %llu\n\tDecrypt: %u bytes: %llu\n\tSign: %u\n\tVerify: %u\n\tErrors: %u\n",
+			drivername,
+			rblk->stat_encrypt_cnt, rblk->stat_encrypt_tlen,
+			rblk->stat_decrypt_cnt, rblk->stat_decrypt_tlen,
+			rblk->stat_sign_cnt, rblk->stat_verify_cnt,
+			rblk->stat_akcipher_err_cnt);
+	} else if (tb[CRYPTOCFGA_STAT_CIPHER]) {
+		struct rtattr *rta = tb[CRYPTOCFGA_STAT_CIPHER];
+		struct crypto_stat *rblk =
+			(struct crypto_stat *)RTA_DATA(rta);
+		printf("%s\tcipher\n\tEncrypt: %u bytes: %llu\n\tDecrypt: %u bytes: %llu\n\tErrors: %u\n",
+			drivername,
+			rblk->stat_encrypt_cnt, rblk->stat_encrypt_tlen,
+			rblk->stat_decrypt_cnt, rblk->stat_decrypt_tlen,
+			rblk->stat_cipher_err_cnt);
+	} else if (tb[CRYPTOCFGA_STAT_RNG]) {
+		struct rtattr *rta = tb[CRYPTOCFGA_STAT_RNG];
+		struct crypto_stat *rrng =
+			(struct crypto_stat *)RTA_DATA(rta);
+		printf("%s\tRNG\n\tSeed: %u\n\tGenerate: %u bytes: %llu\n\tErrors: %u\n",
+			drivername,
+			rrng->stat_seed_cnt,
+			rrng->stat_generate_cnt, rrng->stat_generate_tlen,
+			rrng->stat_rng_err_cnt);
+	} else if (tb[CRYPTOCFGA_STAT_KPP]) {
+		struct rtattr *rta = tb[CRYPTOCFGA_STAT_KPP];
+		struct crypto_stat *rkpp =
+			(struct crypto_stat *)RTA_DATA(rta);
+		printf("%s\tKPP\n\tSetsecret: %u\n\tGenerate public key: %u\n\tCompute_shared_secret: %u\n\tErrors: %u\n",
+			drivername,
+			rkpp->stat_setsecret_cnt,
+			rkpp->stat_generate_public_key_cnt,
+			rkpp->stat_compute_shared_secret_cnt,
+			rkpp->stat_kpp_err_cnt);
+	} else {
+		fprintf(stderr, "%s is of an unknown algorithm\n", drivername);
+	}
+	ret = 0;
+out:
+	close(sd);
+	return ret;
+}
+
+int main(int argc, const char *argv[])
+{
+	char buf[4096];
+	FILE *procfd;
+	int i, lastspace;
+	int ret;
+
+	procfd = fopen("/proc/crypto", "r");
+	if (!procfd) {
+		ret = errno;
+		fprintf(stderr, "Cannot open /proc/crypto %s\n", strerror(errno));
+		return ret;
+	}
+	if (argc > 1) {
+		if (!strcmp(argv[1], "-h") || !strcmp(argv[1], "--help")) {
+			printf("Usage: %s [-h|--help] display this help\n", argv[0]);
+			printf("Usage: %s display all crypto statistics\n", argv[0]);
+			printf("Usage: %s drivername1 drivername2 ... = display crypto statistics about drivername1 ...\n", argv[0]);
+			return 0;
+		}
+		for (i = 1; i < argc; i++) {
+			ret = get_stat(argv[i]);
+			if (ret) {
+				fprintf(stderr, "Failed with %s\n", strerror(-ret));
+				return ret;
+			}
+		}
+		return 0;
+	}
+
+	while (fgets(buf, sizeof(buf), procfd)) {
+		if (!strncmp(buf, "driver", 6)) {
+			lastspace = 0;
+			i = 0;
+			while (i < strlen(buf)) {
+				i++;
+				if (buf[i] == ' ')
+					lastspace = i;
+			}
+			buf[strlen(buf) - 1] = '\0';
+			ret = get_stat(buf + lastspace + 1);
+			if (ret) {
+				fprintf(stderr, "Failed with %s\n", strerror(-ret));
+				goto out;
+			}
+		}
+	}
+out:
+	fclose(procfd);
+	return ret;
+}