1 /* 2 * net/core/gen_stats.c 3 * 4 * This program is free software; you can redistribute 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: Thomas Graf <tgraf@suug.ch> 10 * Jamal Hadi Salim 11 * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> 12 * 13 * See Documentation/networking/gen_stats.txt 14 */ 15 16 #include <linux/types.h> 17 #include <linux/kernel.h> 18 #include <linux/module.h> 19 #include <linux/interrupt.h> 20 #include <linux/socket.h> 21 #include <linux/rtnetlink.h> 22 #include <linux/gen_stats.h> 23 #include <net/netlink.h> 24 #include <net/gen_stats.h> 25 26 27 static inline int 28 gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size) 29 { 30 NLA_PUT(d->skb, type, size, buf); 31 return 0; 32 33 nla_put_failure: 34 spin_unlock_bh(d->lock); 35 return -1; 36 } 37 38 /** 39 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode 40 * @skb: socket buffer to put statistics TLVs into 41 * @type: TLV type for top level statistic TLV 42 * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV 43 * @xstats_type: TLV type for backward compatibility xstats TLV 44 * @lock: statistics lock 45 * @d: dumping handle 46 * 47 * Initializes the dumping handle, grabs the statistic lock and appends 48 * an empty TLV header to the socket buffer for use a container for all 49 * other statistic TLVS. 50 * 51 * The dumping handle is marked to be in backward compatibility mode telling 52 * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats. 53 * 54 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. 55 */ 56 int 57 gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type, 58 int xstats_type, spinlock_t *lock, struct gnet_dump *d) 59 __acquires(lock) 60 { 61 memset(d, 0, sizeof(*d)); 62 63 spin_lock_bh(lock); 64 d->lock = lock; 65 if (type) 66 d->tail = (struct nlattr *)skb_tail_pointer(skb); 67 d->skb = skb; 68 d->compat_tc_stats = tc_stats_type; 69 d->compat_xstats = xstats_type; 70 71 if (d->tail) 72 return gnet_stats_copy(d, type, NULL, 0); 73 74 return 0; 75 } 76 77 /** 78 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode 79 * @skb: socket buffer to put statistics TLVs into 80 * @type: TLV type for top level statistic TLV 81 * @lock: statistics lock 82 * @d: dumping handle 83 * 84 * Initializes the dumping handle, grabs the statistic lock and appends 85 * an empty TLV header to the socket buffer for use a container for all 86 * other statistic TLVS. 87 * 88 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. 89 */ 90 int 91 gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock, 92 struct gnet_dump *d) 93 { 94 return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d); 95 } 96 97 /** 98 * gnet_stats_copy_basic - copy basic statistics into statistic TLV 99 * @d: dumping handle 100 * @b: basic statistics 101 * 102 * Appends the basic statistics to the top level TLV created by 103 * gnet_stats_start_copy(). 104 * 105 * Returns 0 on success or -1 with the statistic lock released 106 * if the room in the socket buffer was not sufficient. 107 */ 108 int 109 gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b) 110 { 111 if (d->compat_tc_stats) { 112 d->tc_stats.bytes = b->bytes; 113 d->tc_stats.packets = b->packets; 114 } 115 116 if (d->tail) { 117 struct gnet_stats_basic sb; 118 119 memset(&sb, 0, sizeof(sb)); 120 sb.bytes = b->bytes; 121 sb.packets = b->packets; 122 return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb)); 123 } 124 return 0; 125 } 126 127 /** 128 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV 129 * @d: dumping handle 130 * @b: basic statistics 131 * @r: rate estimator statistics 132 * 133 * Appends the rate estimator statistics to the top level TLV created by 134 * gnet_stats_start_copy(). 135 * 136 * Returns 0 on success or -1 with the statistic lock released 137 * if the room in the socket buffer was not sufficient. 138 */ 139 int 140 gnet_stats_copy_rate_est(struct gnet_dump *d, 141 const struct gnet_stats_basic_packed *b, 142 struct gnet_stats_rate_est *r) 143 { 144 if (b && !gen_estimator_active(b, r)) 145 return 0; 146 147 if (d->compat_tc_stats) { 148 d->tc_stats.bps = r->bps; 149 d->tc_stats.pps = r->pps; 150 } 151 152 if (d->tail) 153 return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r)); 154 155 return 0; 156 } 157 158 /** 159 * gnet_stats_copy_queue - copy queue statistics into statistics TLV 160 * @d: dumping handle 161 * @q: queue statistics 162 * 163 * Appends the queue statistics to the top level TLV created by 164 * gnet_stats_start_copy(). 165 * 166 * Returns 0 on success or -1 with the statistic lock released 167 * if the room in the socket buffer was not sufficient. 168 */ 169 int 170 gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q) 171 { 172 if (d->compat_tc_stats) { 173 d->tc_stats.drops = q->drops; 174 d->tc_stats.qlen = q->qlen; 175 d->tc_stats.backlog = q->backlog; 176 d->tc_stats.overlimits = q->overlimits; 177 } 178 179 if (d->tail) 180 return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q)); 181 182 return 0; 183 } 184 185 /** 186 * gnet_stats_copy_app - copy application specific statistics into statistics TLV 187 * @d: dumping handle 188 * @st: application specific statistics data 189 * @len: length of data 190 * 191 * Appends the application sepecific statistics to the top level TLV created by 192 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping 193 * handle is in backward compatibility mode. 194 * 195 * Returns 0 on success or -1 with the statistic lock released 196 * if the room in the socket buffer was not sufficient. 197 */ 198 int 199 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) 200 { 201 if (d->compat_xstats) { 202 d->xstats = st; 203 d->xstats_len = len; 204 } 205 206 if (d->tail) 207 return gnet_stats_copy(d, TCA_STATS_APP, st, len); 208 209 return 0; 210 } 211 212 /** 213 * gnet_stats_finish_copy - finish dumping procedure 214 * @d: dumping handle 215 * 216 * Corrects the length of the top level TLV to include all TLVs added 217 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs 218 * if gnet_stats_start_copy_compat() was used and releases the statistics 219 * lock. 220 * 221 * Returns 0 on success or -1 with the statistic lock released 222 * if the room in the socket buffer was not sufficient. 223 */ 224 int 225 gnet_stats_finish_copy(struct gnet_dump *d) 226 { 227 if (d->tail) 228 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; 229 230 if (d->compat_tc_stats) 231 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, 232 sizeof(d->tc_stats)) < 0) 233 return -1; 234 235 if (d->compat_xstats && d->xstats) { 236 if (gnet_stats_copy(d, d->compat_xstats, d->xstats, 237 d->xstats_len) < 0) 238 return -1; 239 } 240 241 spin_unlock_bh(d->lock); 242 return 0; 243 } 244 245 246 EXPORT_SYMBOL(gnet_stats_start_copy); 247 EXPORT_SYMBOL(gnet_stats_start_copy_compat); 248 EXPORT_SYMBOL(gnet_stats_copy_basic); 249 EXPORT_SYMBOL(gnet_stats_copy_rate_est); 250 EXPORT_SYMBOL(gnet_stats_copy_queue); 251 EXPORT_SYMBOL(gnet_stats_copy_app); 252 EXPORT_SYMBOL(gnet_stats_finish_copy); 253