diff options
Diffstat (limited to 'lib/route/cls/ematch/cmp.c')
-rw-r--r-- | lib/route/cls/ematch/cmp.c | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/lib/route/cls/ematch/cmp.c b/lib/route/cls/ematch/cmp.c new file mode 100644 index 0000000..ec25320 --- /dev/null +++ b/lib/route/cls/ematch/cmp.c @@ -0,0 +1,116 @@ +/* + * lib/route/cls/ematch/cmp.c Simple packet data comparison ematch + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation version 2.1 + * of the License. + * + * Copyright (c) 2008-2009 Thomas Graf <tgraf@suug.ch> + */ + +/** + * @ingroup ematch + * @defgroup em_cmp Simple packet data comparison + * + * @{ + */ + +#include <netlink-local.h> +#include <netlink-tc.h> +#include <netlink/netlink.h> +#include <netlink/route/cls/ematch.h> +#include <linux/tc_ematch/tc_em_cmp.h> + +void rtnl_ematch_cmp_set(struct rtnl_ematch *ematch, + struct tcf_em_cmp *cfg) +{ + memcpy(rtnl_ematch_data(ematch), cfg, sizeof(*cfg)); +} + +struct tcf_em_cmp *rtnl_ematch_cmp_get(struct rtnl_ematch *ematch) +{ + return rtnl_ematch_data(ematch); +} + +static const char *align_txt(struct tcf_em_cmp *cmp) +{ + switch (cmp->align) { + case TCF_EM_ALIGN_U8: + return "u8"; + case TCF_EM_ALIGN_U16: + return (cmp->flags & TCF_EM_CMP_TRANS) ? "h16" : "u16"; + case TCF_EM_ALIGN_U32: + return (cmp->flags & TCF_EM_CMP_TRANS) ? "h32" : "u32"; + default: + return (cmp->flags & TCF_EM_CMP_TRANS) ? "h?" : "u?"; + } +} + +static const char *layer_txt(struct tcf_em_cmp *cmp) +{ + switch (cmp->layer) { + case TCF_LAYER_LINK: + return "link"; + case TCF_LAYER_NETWORK: + return "network"; + case TCF_LAYER_TRANSPORT: + return "transport"; + default: + return "?"; + } +} + +static const char *relation_txt(struct tcf_em_cmp *cmp) +{ + switch (cmp->opnd) { + case TCF_EM_OPND_EQ: + return "eq"; + case TCF_EM_OPND_LT: + return "lt"; + case TCF_EM_OPND_GT: + return "gt"; + default: + return "?"; + } +} + +static int cmp_parse(struct rtnl_ematch *m, void *data, size_t len) +{ + memcpy(rtnl_ematch_data(m), data, len); + + return 0; +} + +static void cmp_dump(struct rtnl_ematch *m, struct nl_dump_params *p) +{ + struct tcf_em_cmp *cmp = rtnl_ematch_data(m); + + nl_dump(p, "%s at %s+%u ", + align_txt(cmp), layer_txt(cmp), cmp->off); + + if (cmp->mask) + nl_dump(p, "& 0x%x ", cmp->mask); + + nl_dump(p, "%s %u", relation_txt(cmp), cmp->val); +} + +static struct rtnl_ematch_ops cmp_ops = { + .eo_kind = TCF_EM_CMP, + .eo_name = "cmp", + .eo_datalen = sizeof(struct tcf_em_cmp), + .eo_parse = cmp_parse, + .eo_dump = cmp_dump, +}; + +static void __init cmp_init(void) +{ + rtnl_ematch_register(&cmp_ops); +} + +static void __exit cmp_exit(void) +{ + rtnl_ematch_unregister(&cmp_ops); +} + +/** @} */ |