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 *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 return gnet_stats_copy(d, TCA_STATS_BASIC, b, sizeof(*b)); 118 119 return 0; 120 } 121 122 /** 123 * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV 124 * @d: dumping handle 125 * @r: rate estimator statistics 126 * 127 * Appends the rate estimator statistics to the top level TLV created by 128 * gnet_stats_start_copy(). 129 * 130 * Returns 0 on success or -1 with the statistic lock released 131 * if the room in the socket buffer was not sufficient. 132 */ 133 int 134 gnet_stats_copy_rate_est(struct gnet_dump *d, struct gnet_stats_rate_est *r) 135 { 136 if (d->compat_tc_stats) { 137 d->tc_stats.bps = r->bps; 138 d->tc_stats.pps = r->pps; 139 } 140 141 if (d->tail) 142 return gnet_stats_copy(d, TCA_STATS_RATE_EST, r, sizeof(*r)); 143 144 return 0; 145 } 146 147 /** 148 * gnet_stats_copy_queue - copy queue statistics into statistics TLV 149 * @d: dumping handle 150 * @q: queue statistics 151 * 152 * Appends the queue statistics to the top level TLV created by 153 * gnet_stats_start_copy(). 154 * 155 * Returns 0 on success or -1 with the statistic lock released 156 * if the room in the socket buffer was not sufficient. 157 */ 158 int 159 gnet_stats_copy_queue(struct gnet_dump *d, struct gnet_stats_queue *q) 160 { 161 if (d->compat_tc_stats) { 162 d->tc_stats.drops = q->drops; 163 d->tc_stats.qlen = q->qlen; 164 d->tc_stats.backlog = q->backlog; 165 d->tc_stats.overlimits = q->overlimits; 166 } 167 168 if (d->tail) 169 return gnet_stats_copy(d, TCA_STATS_QUEUE, q, sizeof(*q)); 170 171 return 0; 172 } 173 174 /** 175 * gnet_stats_copy_app - copy application specific statistics into statistics TLV 176 * @d: dumping handle 177 * @st: application specific statistics data 178 * @len: length of data 179 * 180 * Appends the application sepecific statistics to the top level TLV created by 181 * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping 182 * handle is in backward compatibility mode. 183 * 184 * Returns 0 on success or -1 with the statistic lock released 185 * if the room in the socket buffer was not sufficient. 186 */ 187 int 188 gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) 189 { 190 if (d->compat_xstats) { 191 d->xstats = st; 192 d->xstats_len = len; 193 } 194 195 if (d->tail) 196 return gnet_stats_copy(d, TCA_STATS_APP, st, len); 197 198 return 0; 199 } 200 201 /** 202 * gnet_stats_finish_copy - finish dumping procedure 203 * @d: dumping handle 204 * 205 * Corrects the length of the top level TLV to include all TLVs added 206 * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs 207 * if gnet_stats_start_copy_compat() was used and releases the statistics 208 * lock. 209 * 210 * Returns 0 on success or -1 with the statistic lock released 211 * if the room in the socket buffer was not sufficient. 212 */ 213 int 214 gnet_stats_finish_copy(struct gnet_dump *d) 215 { 216 if (d->tail) 217 d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; 218 219 if (d->compat_tc_stats) 220 if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, 221 sizeof(d->tc_stats)) < 0) 222 return -1; 223 224 if (d->compat_xstats && d->xstats) { 225 if (gnet_stats_copy(d, d->compat_xstats, d->xstats, 226 d->xstats_len) < 0) 227 return -1; 228 } 229 230 spin_unlock_bh(d->lock); 231 return 0; 232 } 233 234 235 EXPORT_SYMBOL(gnet_stats_start_copy); 236 EXPORT_SYMBOL(gnet_stats_start_copy_compat); 237 EXPORT_SYMBOL(gnet_stats_copy_basic); 238 EXPORT_SYMBOL(gnet_stats_copy_rate_est); 239 EXPORT_SYMBOL(gnet_stats_copy_queue); 240 EXPORT_SYMBOL(gnet_stats_copy_app); 241 EXPORT_SYMBOL(gnet_stats_finish_copy); 242