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 * @r: rate estimator statistics 131 * 132 * Appends the rate estimator statistics to the top level TLV created by 133 * gnet_stats_start_copy(). 134 * 135 * Returns 0 on success or -1 with the statistic lock released 136 * if the room in the socket buffer was not sufficient. 137 */ 138 int 139 gnet_stats_copy_rate_est(struct gnet_dump *d, struct gnet_stats_rate_est *r) 140 { 141 if (d->compat_tc_stats) { 142 d->tc_stats.bps = r->bps; 143 d->tc_stats.pps = r->pps; 144 } 145 146 if (d->tail) 147 return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r)); 148 149 return 0; 150 } 151 152 /** 153 * gnet_stats_copy_queue - copy queue statistics into statistics TLV 154 * @d: dumping handle 155 * @q: queue statistics 156 * 157 * Appends the queue statistics to the top level TLV created by 158 * gnet_stats_start_copy(). 159 * 160 * Returns 0 on success or -1 with the statistic lock released 161 * if the room in the socket buffer was not sufficient. 162 */ 163 int 164 gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q) 165 { 166 if (d->compat_tc_stats) { 167 d->tc_stats.drops = q->drops; 168 d->tc_stats.qlen = q->qlen; 169 d->tc_stats.backlog = q->backlog; 170 d->tc_stats.overlimits = q->overlimits; 171 } 172 173 if (d->tail) 174 return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q)); 175 176 return 0; 177 } 178 179 /** 180 * gnet_stats_copy_app - copy application specific statistics into statistics TLV 181 * @d: dumping handle 182 * @st: application specific statistics data 183 * @len: length of data 184 * 185 * Appends the application sepecific statistics to the top level TLV created by 186 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping 187 * handle is in backward compatibility mode. 188 * 189 * Returns 0 on success or -1 with the statistic lock released 190 * if the room in the socket buffer was not sufficient. 191 */ 192 int 193 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) 194 { 195 if (d->compat_xstats) { 196 d->xstats = st; 197 d->xstats_len = len; 198 } 199 200 if (d->tail) 201 return gnet_stats_copy(d, TCA_STATS_APP, st, len); 202 203 return 0; 204 } 205 206 /** 207 * gnet_stats_finish_copy - finish dumping procedure 208 * @d: dumping handle 209 * 210 * Corrects the length of the top level TLV to include all TLVs added 211 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs 212 * if gnet_stats_start_copy_compat() was used and releases the statistics 213 * lock. 214 * 215 * Returns 0 on success or -1 with the statistic lock released 216 * if the room in the socket buffer was not sufficient. 217 */ 218 int 219 gnet_stats_finish_copy(struct gnet_dump *d) 220 { 221 if (d->tail) 222 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; 223 224 if (d->compat_tc_stats) 225 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, 226 sizeof(d->tc_stats)) < 0) 227 return -1; 228 229 if (d->compat_xstats && d->xstats) { 230 if (gnet_stats_copy(d, d->compat_xstats, d->xstats, 231 d->xstats_len) < 0) 232 return -1; 233 } 234 235 spin_unlock_bh(d->lock); 236 return 0; 237 } 238 239 240 EXPORT_SYMBOL(gnet_stats_start_copy); 241 EXPORT_SYMBOL(gnet_stats_start_copy_compat); 242 EXPORT_SYMBOL(gnet_stats_copy_basic); 243 EXPORT_SYMBOL(gnet_stats_copy_rate_est); 244 EXPORT_SYMBOL(gnet_stats_copy_queue); 245 EXPORT_SYMBOL(gnet_stats_copy_app); 246 EXPORT_SYMBOL(gnet_stats_finish_copy); 247