1 /* 2 * lib/route/cls/ematch/cmp.c Simple packet data comparison ematch 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation version 2.1 7 * of the License. 8 * 9 * Copyright (c) 2008-2013 Thomas Graf <tgraf (at) suug.ch> 10 */ 11 12 /** 13 * @ingroup ematch 14 * @defgroup em_cmp Simple packet data comparison 15 * 16 * @{ 17 */ 18 19 #include <netlink-private/netlink.h> 20 #include <netlink-private/tc.h> 21 #include <netlink/netlink.h> 22 #include <netlink/route/cls/ematch.h> 23 #include <linux/tc_ematch/tc_em_cmp.h> 24 25 void rtnl_ematch_cmp_set(struct rtnl_ematch *e, struct tcf_em_cmp *cfg) 26 { 27 memcpy(rtnl_ematch_data(e), cfg, sizeof(*cfg)); 28 } 29 30 struct tcf_em_cmp *rtnl_ematch_cmp_get(struct rtnl_ematch *e) 31 { 32 return rtnl_ematch_data(e); 33 } 34 35 static int cmp_parse(struct rtnl_ematch *e, void *data, size_t len) 36 { 37 memcpy(rtnl_ematch_data(e), data, len); 38 39 return 0; 40 } 41 42 static const char *align_txt[] = { 43 [TCF_EM_ALIGN_U8] = "u8", 44 [TCF_EM_ALIGN_U16] = "u16", 45 [TCF_EM_ALIGN_U32] = "u32" 46 }; 47 48 static const char *layer_txt[] = { 49 [TCF_LAYER_LINK] = "eth", 50 [TCF_LAYER_NETWORK] = "ip", 51 [TCF_LAYER_TRANSPORT] = "tcp" 52 }; 53 54 static const char *operand_txt[] = { 55 [TCF_EM_OPND_EQ] = "=", 56 [TCF_EM_OPND_LT] = "<", 57 [TCF_EM_OPND_GT] = ">", 58 }; 59 60 static void cmp_dump(struct rtnl_ematch *e, struct nl_dump_params *p) 61 { 62 struct tcf_em_cmp *cmp = rtnl_ematch_data(e); 63 64 if (cmp->flags & TCF_EM_CMP_TRANS) 65 nl_dump(p, "ntoh%c(", (cmp->align == TCF_EM_ALIGN_U32) ? 'l' : 's'); 66 67 nl_dump(p, "%s at %s+%u", 68 align_txt[cmp->align], layer_txt[cmp->layer], cmp->off); 69 70 if (cmp->mask) 71 nl_dump(p, " & 0x%x", cmp->mask); 72 73 if (cmp->flags & TCF_EM_CMP_TRANS) 74 nl_dump(p, ")"); 75 76 nl_dump(p, " %s %u", operand_txt[cmp->opnd], cmp->val); 77 } 78 79 static struct rtnl_ematch_ops cmp_ops = { 80 .eo_kind = TCF_EM_CMP, 81 .eo_name = "cmp", 82 .eo_minlen = sizeof(struct tcf_em_cmp), 83 .eo_datalen = sizeof(struct tcf_em_cmp), 84 .eo_parse = cmp_parse, 85 .eo_dump = cmp_dump, 86 }; 87 88 static void __init cmp_init(void) 89 { 90 rtnl_ematch_register(&cmp_ops); 91 } 92 93 /** @} */ 94