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 EXPORT_SYMBOL(gnet_stats_start_copy_compat); 77 78 /** 79 * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode 80 * @skb: socket buffer to put statistics TLVs into 81 * @type: TLV type for top level statistic TLV 82 * @lock: statistics lock 83 * @d: dumping handle 84 * 85 * Initializes the dumping handle, grabs the statistic lock and appends 86 * an empty TLV header to the socket buffer for use a container for all 87 * other statistic TLVS. 88 * 89 * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. 90 */ 91 int 92 gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock, 93 struct gnet_dump *d) 94 { 95 return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d); 96 } 97 EXPORT_SYMBOL(gnet_stats_start_copy); 98 99 /** 100 * gnet_stats_copy_basic - copy basic statistics into statistic TLV 101 * @d: dumping handle 102 * @b: basic statistics 103 * 104 * Appends the basic statistics to the top level TLV created by 105 * gnet_stats_start_copy(). 106 * 107 * Returns 0 on success or -1 with the statistic lock released 108 * if the room in the socket buffer was not sufficient. 109 */ 110 int 111 gnet_stats_copy_basic(struct gnet_dump *d, struct gnet_stats_basic_packed *b) 112 { 113 if (d->compat_tc_stats) { 114 d->tc_stats.bytes = b->bytes; 115 d->tc_stats.packets = b->packets; 116 } 117 118 if (d->tail) { 119 struct gnet_stats_basic sb; 120 121 memset(&sb, 0, sizeof(sb)); 122 sb.bytes = b->bytes; 123 sb.packets = b->packets; 124 return gnet_stats_copy(d, TCA_STATS_BASIC, &sb, sizeof(sb)); 125 } 126 return 0; 127 } 128 EXPORT_SYMBOL(gnet_stats_copy_basic); 129 130 /** 131 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV 132 * @d: dumping handle 133 * @b: basic statistics 134 * @r: rate estimator statistics 135 * 136 * Appends the rate estimator statistics to the top level TLV created by 137 * gnet_stats_start_copy(). 138 * 139 * Returns 0 on success or -1 with the statistic lock released 140 * if the room in the socket buffer was not sufficient. 141 */ 142 int 143 gnet_stats_copy_rate_est(struct gnet_dump *d, 144 const struct gnet_stats_basic_packed *b, 145 struct gnet_stats_rate_est *r) 146 { 147 if (b && !gen_estimator_active(b, r)) 148 return 0; 149 150 if (d->compat_tc_stats) { 151 d->tc_stats.bps = r->bps; 152 d->tc_stats.pps = r->pps; 153 } 154 155 if (d->tail) 156 return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r)); 157 158 return 0; 159 } 160 EXPORT_SYMBOL(gnet_stats_copy_rate_est); 161 162 /** 163 * gnet_stats_copy_queue - copy queue statistics into statistics TLV 164 * @d: dumping handle 165 * @q: queue statistics 166 * 167 * Appends the queue statistics to the top level TLV created by 168 * gnet_stats_start_copy(). 169 * 170 * Returns 0 on success or -1 with the statistic lock released 171 * if the room in the socket buffer was not sufficient. 172 */ 173 int 174 gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q) 175 { 176 if (d->compat_tc_stats) { 177 d->tc_stats.drops = q->drops; 178 d->tc_stats.qlen = q->qlen; 179 d->tc_stats.backlog = q->backlog; 180 d->tc_stats.overlimits = q->overlimits; 181 } 182 183 if (d->tail) 184 return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q)); 185 186 return 0; 187 } 188 EXPORT_SYMBOL(gnet_stats_copy_queue); 189 190 /** 191 * gnet_stats_copy_app - copy application specific statistics into statistics TLV 192 * @d: dumping handle 193 * @st: application specific statistics data 194 * @len: length of data 195 * 196 * Appends the application sepecific statistics to the top level TLV created by 197 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping 198 * handle is in backward compatibility mode. 199 * 200 * Returns 0 on success or -1 with the statistic lock released 201 * if the room in the socket buffer was not sufficient. 202 */ 203 int 204 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) 205 { 206 if (d->compat_xstats) { 207 d->xstats = st; 208 d->xstats_len = len; 209 } 210 211 if (d->tail) 212 return gnet_stats_copy(d, TCA_STATS_APP, st, len); 213 214 return 0; 215 } 216 EXPORT_SYMBOL(gnet_stats_copy_app); 217 218 /** 219 * gnet_stats_finish_copy - finish dumping procedure 220 * @d: dumping handle 221 * 222 * Corrects the length of the top level TLV to include all TLVs added 223 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs 224 * if gnet_stats_start_copy_compat() was used and releases the statistics 225 * lock. 226 * 227 * Returns 0 on success or -1 with the statistic lock released 228 * if the room in the socket buffer was not sufficient. 229 */ 230 int 231 gnet_stats_finish_copy(struct gnet_dump *d) 232 { 233 if (d->tail) 234 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; 235 236 if (d->compat_tc_stats) 237 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, 238 sizeof(d->tc_stats)) < 0) 239 return -1; 240 241 if (d->compat_xstats && d->xstats) { 242 if (gnet_stats_copy(d, d->compat_xstats, d->xstats, 243 d->xstats_len) < 0) 244 return -1; 245 } 246 247 spin_unlock_bh(d->lock); 248 return 0; 249 } 250 EXPORT_SYMBOL(gnet_stats_finish_copy); 251