Yotam Gigi | 0b1abd8 | 2017-02-05 09:58:52 +0200 | [diff] [blame] | 1 | /* |
| 2 | * m_sample.c ingress/egress packet sampling module |
| 3 | * |
| 4 | * This program is free software; you can distribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * Authors: Yotam Gigi <yotamg@mellanox.com> |
| 10 | * |
| 11 | */ |
| 12 | |
| 13 | #include <stdio.h> |
| 14 | #include "utils.h" |
| 15 | #include "tc_util.h" |
| 16 | #include "tc_common.h" |
| 17 | #include <linux/tc_act/tc_sample.h> |
| 18 | |
| 19 | static void explain(void) |
| 20 | { |
| 21 | fprintf(stderr, "Usage: sample SAMPLE_CONF\n"); |
| 22 | fprintf(stderr, "where:\n"); |
| 23 | fprintf(stderr, "\tSAMPLE_CONF := SAMPLE_PARAMS | SAMPLE_INDEX\n"); |
| 24 | fprintf(stderr, "\tSAMPLE_PARAMS := rate RATE group GROUP [trunc SIZE] [SAMPLE_INDEX]\n"); |
| 25 | fprintf(stderr, "\tSAMPLE_INDEX := index INDEX\n"); |
| 26 | fprintf(stderr, "\tRATE := The ratio of packets observed at the data source to the samples generated.\n"); |
| 27 | fprintf(stderr, "\tGROUP := the psample sampling group\n"); |
| 28 | fprintf(stderr, "\tSIZE := the truncation size\n"); |
| 29 | fprintf(stderr, "\tINDEX := integer index of the sample action\n"); |
| 30 | } |
| 31 | |
| 32 | static void usage(void) |
| 33 | { |
| 34 | explain(); |
| 35 | exit(-1); |
| 36 | } |
| 37 | |
| 38 | static int parse_sample(struct action_util *a, int *argc_p, char ***argv_p, |
| 39 | int tca_id, struct nlmsghdr *n) |
| 40 | { |
| 41 | struct tc_sample p = { 0 }; |
| 42 | bool trunc_set = false; |
| 43 | bool group_set = false; |
| 44 | bool rate_set = false; |
| 45 | char **argv = *argv_p; |
| 46 | struct rtattr *tail; |
| 47 | int argc = *argc_p; |
| 48 | __u32 trunc; |
| 49 | __u32 group; |
| 50 | __u32 rate; |
| 51 | |
| 52 | if (argc <= 1) { |
| 53 | fprintf(stderr, "sample bad argument count %d\n", argc); |
| 54 | usage(); |
| 55 | return -1; |
| 56 | } |
| 57 | |
| 58 | if (matches(*argv, "sample") == 0) { |
| 59 | NEXT_ARG(); |
| 60 | } else { |
| 61 | fprintf(stderr, "sample bad argument %s\n", *argv); |
| 62 | return -1; |
| 63 | } |
| 64 | |
| 65 | while (argc > 0) { |
| 66 | if (matches(*argv, "rate") == 0) { |
| 67 | NEXT_ARG(); |
| 68 | if (get_unsigned(&rate, *argv, 10) != 0) { |
| 69 | fprintf(stderr, "Illegal rate %s\n", *argv); |
| 70 | usage(); |
| 71 | return -1; |
| 72 | } |
| 73 | rate_set = true; |
| 74 | } else if (matches(*argv, "group") == 0) { |
| 75 | NEXT_ARG(); |
| 76 | if (get_unsigned(&group, *argv, 10) != 0) { |
| 77 | fprintf(stderr, "Illegal group num %s\n", |
| 78 | *argv); |
| 79 | usage(); |
| 80 | return -1; |
| 81 | } |
| 82 | group_set = true; |
| 83 | } else if (matches(*argv, "trunc") == 0) { |
| 84 | NEXT_ARG(); |
| 85 | if (get_unsigned(&trunc, *argv, 10) != 0) { |
| 86 | fprintf(stderr, "Illegal truncation size %s\n", |
| 87 | *argv); |
| 88 | usage(); |
| 89 | return -1; |
| 90 | } |
| 91 | trunc_set = true; |
| 92 | } else if (matches(*argv, "help") == 0) { |
| 93 | usage(); |
| 94 | } else { |
| 95 | break; |
| 96 | } |
| 97 | |
| 98 | NEXT_ARG_FWD(); |
| 99 | } |
| 100 | |
Jiri Pirko | e67aba5 | 2017-05-16 19:29:36 +0200 | [diff] [blame] | 101 | parse_action_control_dflt(&argc, &argv, &p.action, false, TC_ACT_PIPE); |
Yotam Gigi | 0b1abd8 | 2017-02-05 09:58:52 +0200 | [diff] [blame] | 102 | |
| 103 | if (argc) { |
| 104 | if (matches(*argv, "index") == 0) { |
| 105 | NEXT_ARG(); |
| 106 | if (get_u32(&p.index, *argv, 10)) { |
| 107 | fprintf(stderr, "sample: Illegal \"index\"\n"); |
| 108 | return -1; |
| 109 | } |
| 110 | NEXT_ARG_FWD(); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | if (!p.index && !group_set) { |
| 115 | fprintf(stderr, "param \"group\" not set\n"); |
| 116 | usage(); |
| 117 | } |
| 118 | |
| 119 | if (!p.index && !rate_set) { |
| 120 | fprintf(stderr, "param \"rate\" not set\n"); |
| 121 | usage(); |
| 122 | } |
| 123 | |
| 124 | tail = NLMSG_TAIL(n); |
| 125 | addattr_l(n, MAX_MSG, tca_id, NULL, 0); |
| 126 | addattr_l(n, MAX_MSG, TCA_SAMPLE_PARMS, &p, sizeof(p)); |
| 127 | if (rate_set) |
| 128 | addattr32(n, MAX_MSG, TCA_SAMPLE_RATE, rate); |
| 129 | if (group_set) |
| 130 | addattr32(n, MAX_MSG, TCA_SAMPLE_PSAMPLE_GROUP, group); |
| 131 | if (trunc_set) |
| 132 | addattr32(n, MAX_MSG, TCA_SAMPLE_TRUNC_SIZE, trunc); |
| 133 | |
| 134 | tail->rta_len = (char *)NLMSG_TAIL(n) - (char *)tail; |
| 135 | |
| 136 | *argc_p = argc; |
| 137 | *argv_p = argv; |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | static int print_sample(struct action_util *au, FILE *f, struct rtattr *arg) |
| 142 | { |
| 143 | struct rtattr *tb[TCA_SAMPLE_MAX + 1]; |
| 144 | struct tc_sample *p; |
| 145 | |
| 146 | if (arg == NULL) |
| 147 | return -1; |
| 148 | |
| 149 | parse_rtattr_nested(tb, TCA_SAMPLE_MAX, arg); |
| 150 | |
| 151 | if (!tb[TCA_SAMPLE_PARMS] || !tb[TCA_SAMPLE_RATE] || |
| 152 | !tb[TCA_SAMPLE_PSAMPLE_GROUP]) { |
| 153 | fprintf(f, "[NULL sample parameters]"); |
| 154 | return -1; |
| 155 | } |
| 156 | p = RTA_DATA(tb[TCA_SAMPLE_PARMS]); |
| 157 | |
| 158 | fprintf(f, "sample rate 1/%d group %d", |
| 159 | rta_getattr_u32(tb[TCA_SAMPLE_RATE]), |
| 160 | rta_getattr_u32(tb[TCA_SAMPLE_PSAMPLE_GROUP])); |
| 161 | |
| 162 | if (tb[TCA_SAMPLE_TRUNC_SIZE]) |
| 163 | fprintf(f, " trunc_size %d", |
| 164 | rta_getattr_u32(tb[TCA_SAMPLE_TRUNC_SIZE])); |
| 165 | |
| 166 | fprintf(f, "\n\tindex %d ref %d bind %d", p->index, p->refcnt, |
| 167 | p->bindcnt); |
| 168 | |
| 169 | if (show_stats) { |
| 170 | if (tb[TCA_SAMPLE_TM]) { |
| 171 | struct tcf_t *tm = RTA_DATA(tb[TCA_SAMPLE_TM]); |
| 172 | |
| 173 | print_tm(f, tm); |
| 174 | } |
| 175 | } |
| 176 | fprintf(f, "\n"); |
| 177 | return 0; |
| 178 | } |
| 179 | |
| 180 | struct action_util sample_action_util = { |
| 181 | .id = "sample", |
| 182 | .parse_aopt = parse_sample, |
| 183 | .print_aopt = print_sample, |
| 184 | }; |