diff options
Diffstat (limited to 'src/expr/queue.c')
| -rw-r--r-- | src/expr/queue.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/src/expr/queue.c b/src/expr/queue.c new file mode 100644 index 0000000..de287f2 --- /dev/null +++ b/src/expr/queue.c @@ -0,0 +1,197 @@ +/* + * (C) 2013 by Eric Leblond <eric@regit.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published + * by the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + */ + +#include <stdio.h> +#include <stdint.h> +#include <string.h> +#include <arpa/inet.h> +#include <errno.h> +#include <linux/netfilter/nf_tables.h> + +#include "internal.h" +#include <libmnl/libmnl.h> +#include <libnftnl/expr.h> +#include <libnftnl/rule.h> + +struct nftnl_expr_queue { + enum nft_registers sreg_qnum; + uint16_t queuenum; + uint16_t queues_total; + uint16_t flags; +}; + +static int nftnl_expr_queue_set(struct nftnl_expr *e, uint16_t type, + const void *data, uint32_t data_len) +{ + struct nftnl_expr_queue *queue = nftnl_expr_data(e); + + switch(type) { + case NFTNL_EXPR_QUEUE_NUM: + memcpy(&queue->queuenum, data, sizeof(queue->queuenum)); + break; + case NFTNL_EXPR_QUEUE_TOTAL: + memcpy(&queue->queues_total, data, sizeof(queue->queues_total)); + break; + case NFTNL_EXPR_QUEUE_FLAGS: + memcpy(&queue->flags, data, sizeof(queue->flags)); + break; + case NFTNL_EXPR_QUEUE_SREG_QNUM: + memcpy(&queue->sreg_qnum, data, sizeof(queue->sreg_qnum)); + break; + default: + return -1; + } + return 0; +} + +static const void * +nftnl_expr_queue_get(const struct nftnl_expr *e, uint16_t type, + uint32_t *data_len) +{ + struct nftnl_expr_queue *queue = nftnl_expr_data(e); + + switch(type) { + case NFTNL_EXPR_QUEUE_NUM: + *data_len = sizeof(queue->queuenum); + return &queue->queuenum; + case NFTNL_EXPR_QUEUE_TOTAL: + *data_len = sizeof(queue->queues_total); + return &queue->queues_total; + case NFTNL_EXPR_QUEUE_FLAGS: + *data_len = sizeof(queue->flags); + return &queue->flags; + case NFTNL_EXPR_QUEUE_SREG_QNUM: + *data_len = sizeof(queue->sreg_qnum); + return &queue->sreg_qnum; + } + return NULL; +} + +static int nftnl_expr_queue_cb(const struct nlattr *attr, void *data) +{ + const struct nlattr **tb = data; + int type = mnl_attr_get_type(attr); + + if (mnl_attr_type_valid(attr, NFTA_QUEUE_MAX) < 0) + return MNL_CB_OK; + + switch(type) { + case NFTA_QUEUE_NUM: + case NFTA_QUEUE_TOTAL: + case NFTA_QUEUE_FLAGS: + if (mnl_attr_validate(attr, MNL_TYPE_U16) < 0) + abi_breakage(); + break; + case NFTA_QUEUE_SREG_QNUM: + if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0) + abi_breakage(); + break; + } + + tb[type] = attr; + return MNL_CB_OK; +} + +static void +nftnl_expr_queue_build(struct nlmsghdr *nlh, const struct nftnl_expr *e) +{ + struct nftnl_expr_queue *queue = nftnl_expr_data(e); + + if (e->flags & (1 << NFTNL_EXPR_QUEUE_NUM)) + mnl_attr_put_u16(nlh, NFTA_QUEUE_NUM, htons(queue->queuenum)); + if (e->flags & (1 << NFTNL_EXPR_QUEUE_TOTAL)) + mnl_attr_put_u16(nlh, NFTA_QUEUE_TOTAL, htons(queue->queues_total)); + if (e->flags & (1 << NFTNL_EXPR_QUEUE_FLAGS)) + mnl_attr_put_u16(nlh, NFTA_QUEUE_FLAGS, htons(queue->flags)); + if (e->flags & (1 << NFTNL_EXPR_QUEUE_SREG_QNUM)) + mnl_attr_put_u32(nlh, NFTA_QUEUE_SREG_QNUM, htonl(queue->sreg_qnum)); +} + +static int +nftnl_expr_queue_parse(struct nftnl_expr *e, struct nlattr *attr) +{ + struct nftnl_expr_queue *queue = nftnl_expr_data(e); + struct nlattr *tb[NFTA_QUEUE_MAX+1] = {}; + + if (mnl_attr_parse_nested(attr, nftnl_expr_queue_cb, tb) < 0) + return -1; + + if (tb[NFTA_QUEUE_NUM]) { + queue->queuenum = ntohs(mnl_attr_get_u16(tb[NFTA_QUEUE_NUM])); + e->flags |= (1 << NFTNL_EXPR_QUEUE_NUM); + } + if (tb[NFTA_QUEUE_TOTAL]) { + queue->queues_total = ntohs(mnl_attr_get_u16(tb[NFTA_QUEUE_TOTAL])); + e->flags |= (1 << NFTNL_EXPR_QUEUE_TOTAL); + } + if (tb[NFTA_QUEUE_FLAGS]) { + queue->flags = ntohs(mnl_attr_get_u16(tb[NFTA_QUEUE_FLAGS])); + e->flags |= (1 << NFTNL_EXPR_QUEUE_FLAGS); + } + if (tb[NFTA_QUEUE_SREG_QNUM]) { + queue->sreg_qnum = ntohl(mnl_attr_get_u32(tb[NFTA_QUEUE_SREG_QNUM])); + e->flags |= (1 << NFTNL_EXPR_QUEUE_SREG_QNUM); + } + + return 0; +} + +static int +nftnl_expr_queue_snprintf(char *buf, size_t remain, + uint32_t flags, const struct nftnl_expr *e) +{ + struct nftnl_expr_queue *queue = nftnl_expr_data(e); + uint16_t total_queues; + int ret, offset = 0; + + if (e->flags & (1 << NFTNL_EXPR_QUEUE_NUM)) { + total_queues = queue->queuenum + queue->queues_total - 1; + + ret = snprintf(buf + offset, remain, "num %u", queue->queuenum); + SNPRINTF_BUFFER_SIZE(ret, remain, offset); + + if (queue->queues_total && total_queues != queue->queuenum) { + ret = snprintf(buf + offset, remain, "-%u", total_queues); + SNPRINTF_BUFFER_SIZE(ret, remain, offset); + } + + ret = snprintf(buf + offset, remain, " "); + SNPRINTF_BUFFER_SIZE(ret, remain, offset); + } + + if (e->flags & (1 << NFTNL_EXPR_QUEUE_SREG_QNUM)) { + ret = snprintf(buf + offset, remain, "sreg_qnum %u ", + queue->sreg_qnum); + SNPRINTF_BUFFER_SIZE(ret, remain, offset); + } + + if (e->flags & (1 << NFTNL_EXPR_QUEUE_FLAGS)) { + if (queue->flags & (NFT_QUEUE_FLAG_BYPASS)) { + ret = snprintf(buf + offset, remain, "bypass "); + SNPRINTF_BUFFER_SIZE(ret, remain, offset); + } + if (queue->flags & (NFT_QUEUE_FLAG_CPU_FANOUT)) { + ret = snprintf(buf + offset, remain, "fanout "); + SNPRINTF_BUFFER_SIZE(ret, remain, offset); + } + } + return offset; +} + +struct expr_ops expr_ops_queue = { + .name = "queue", + .alloc_len = sizeof(struct nftnl_expr_queue), + .max_attr = NFTA_QUEUE_MAX, + .set = nftnl_expr_queue_set, + .get = nftnl_expr_queue_get, + .parse = nftnl_expr_queue_parse, + .build = nftnl_expr_queue_build, + .output = nftnl_expr_queue_snprintf, +}; |