| /* |
| * net/sched/em_meta.c Metadata ematch |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| * Authors: Thomas Graf <tgraf@suug.ch> |
| * |
| * ========================================================================== |
| * |
| * The metadata ematch compares two meta objects where each object |
| * represents either a meta value stored in the kernel or a static |
| * value provided by userspace. The objects are not provided by |
| * userspace itself but rather a definition providing the information |
| * to build them. Every object is of a certain type which must be |
| * equal to the object it is being compared to. |
| * |
| * The definition of a objects conists of the type (meta type), a |
| * identifier (meta id) and additional type specific information. |
| * The meta id is either TCF_META_TYPE_VALUE for values provided by |
| * userspace or a index to the meta operations table consisting of |
| * function pointers to type specific meta data collectors returning |
| * the value of the requested meta value. |
| * |
| * lvalue rvalue |
| * +-----------+ +-----------+ |
| * | type: INT | | type: INT | |
| * def | id: DEV | | id: VALUE | |
| * | data: | | data: 3 | |
| * +-----------+ +-----------+ |
| * | | |
| * ---> meta_ops[INT][DEV](...) | |
| * | | |
| * ----------- | |
| * V V |
| * +-----------+ +-----------+ |
| * | type: INT | | type: INT | |
| * obj | id: DEV | | id: VALUE | |
| * | data: 2 |<--data got filled out | data: 3 | |
| * +-----------+ +-----------+ |
| * | | |
| * --------------> 2 equals 3 <-------------- |
| * |
| * This is a simplified schema, the complexity varies depending |
| * on the meta type. Obviously, the length of the data must also |
| * be provided for non-numeric types. |
| * |
| * Additionaly, type dependant modifiers such as shift operators |
| * or mask may be applied to extend the functionaliy. As of now, |
| * the variable length type supports shifting the byte string to |
| * the right, eating up any number of octets and thus supporting |
| * wildcard interface name comparisons such as "ppp%" matching |
| * ppp0..9. |
| * |
| * NOTE: Certain meta values depend on other subsystems and are |
| * only available if that subsystem is enabled in the kernel. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/sched.h> |
| #include <linux/string.h> |
| #include <linux/skbuff.h> |
| #include <linux/random.h> |
| #include <linux/tc_ematch/tc_em_meta.h> |
| #include <net/dst.h> |
| #include <net/route.h> |
| #include <net/pkt_cls.h> |
| #include <net/sock.h> |
| |
| struct meta_obj |
| { |
| unsigned long value; |
| unsigned int len; |
| }; |
| |
| struct meta_value |
| { |
| struct tcf_meta_val hdr; |
| unsigned long val; |
| unsigned int len; |
| }; |
| |
| struct meta_match |
| { |
| struct meta_value lvalue; |
| struct meta_value rvalue; |
| }; |
| |
| static inline int meta_id(struct meta_value *v) |
| { |
| return TCF_META_ID(v->hdr.kind); |
| } |
| |
| static inline int meta_type(struct meta_value *v) |
| { |
| return TCF_META_TYPE(v->hdr.kind); |
| } |
| |
| #define META_COLLECTOR(FUNC) static void meta_##FUNC(struct sk_buff *skb, \ |
| struct tcf_pkt_info *info, struct meta_value *v, \ |
| struct meta_obj *dst, int *err) |
| |
| /************************************************************************** |
| * System status & misc |
| **************************************************************************/ |
| |
| META_COLLECTOR(int_random) |
| { |
| get_random_bytes(&dst->value, sizeof(dst->value)); |
| } |
| |
| static inline unsigned long fixed_loadavg(int load) |
| { |
| int rnd_load = load + (FIXED_1/200); |
| int rnd_frac = ((rnd_load & (FIXED_1-1)) * 100) >> FSHIFT; |
| |
| return ((rnd_load >> FSHIFT) * 100) + rnd_frac; |
| } |
| |
| META_COLLECTOR(int_loadavg_0) |
| { |
| dst->value = fixed_loadavg(avenrun[0]); |
| } |
| |
| META_COLLECTOR(int_loadavg_1) |
| { |
| dst->value = fixed_loadavg(avenrun[1]); |
| } |
| |
| META_COLLECTOR(int_loadavg_2) |
| { |
| dst->value = fixed_loadavg(avenrun[2]); |
| } |
| |
| /************************************************************************** |
| * Device names & indices |
| **************************************************************************/ |
| |
| static inline int int_dev(struct net_device *dev, struct meta_obj *dst) |
| { |
| if (unlikely(dev == NULL)) |
| return -1; |
| |
| dst->value = dev->ifindex; |
| return 0; |
| } |
| |
| static inline int var_dev(struct net_device *dev, struct meta_obj *dst) |
| { |
| if (unlikely(dev == NULL)) |
| return -1; |
| |
| dst->value = (unsigned long) dev->name; |
| dst->len = strlen(dev->name); |
| return 0; |
| } |
| |
| META_COLLECTOR(int_dev) |
| { |
| *err = int_dev(skb->dev, dst); |
| } |
| |
| META_COLLECTOR(var_dev) |
| { |
| *err = var_dev(skb->dev, dst); |
| } |
| |
| /************************************************************************** |
| * skb attributes |
| **************************************************************************/ |
| |
| META_COLLECTOR(int_priority) |
| { |
| dst->value = skb->priority; |
| } |
| |
| META_COLLECTOR(int_protocol) |
| { |
| /* Let userspace take care of the byte ordering */ |
| dst->value = skb->protocol; |
| } |
| |
| META_COLLECTOR(int_pkttype) |
| { |
| dst->value = skb->pkt_type; |
| } |
| |
| META_COLLECTOR(int_pktlen) |
| { |
| dst->value = skb->len; |
| } |
| |
| META_COLLECTOR(int_datalen) |
| { |
| dst->value = skb->data_len; |
| } |
| |
| META_COLLECTOR(int_maclen) |
| { |
| dst->value = skb->mac_len; |
| } |
| |
| /************************************************************************** |
| * Netfilter |
| **************************************************************************/ |
| |
| META_COLLECTOR(int_mark) |
| { |
| dst->value = skb->mark; |
| } |
| |
| /************************************************************************** |
| * Traffic Control |
| **************************************************************************/ |
| |
| META_COLLECTOR(int_tcindex) |
| { |
| dst->value = skb->tc_index; |
| } |
| |
| /************************************************************************** |
| * Routing |
| **************************************************************************/ |
| |
| META_COLLECTOR(int_rtclassid) |
| { |
| if (unlikely(skb->dst == NULL)) |
| *err = -1; |
| else |
| #ifdef CONFIG_NET_CLS_ROUTE |
| dst->value = skb->dst->tclassid; |
| #else |
| dst->value = 0; |
| #endif |
| } |
| |
| META_COLLECTOR(int_rtiif) |
| { |
| if (unlikely(skb->dst == NULL)) |
| *err = -1; |
| else |
| dst->value = ((struct rtable*) skb->dst)->fl.iif; |
| } |
| |
| /************************************************************************** |
| * Socket Attributes |
| **************************************************************************/ |
| |
| #define SKIP_NONLOCAL(skb) \ |
| if (unlikely(skb->sk == NULL)) { \ |
| *err = -1; \ |
| return; \ |
| } |
| |
| META_COLLECTOR(int_sk_family) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_family; |
| } |
| |
| META_COLLECTOR(int_sk_state) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_state; |
| } |
| |
| META_COLLECTOR(int_sk_reuse) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_reuse; |
| } |
| |
| META_COLLECTOR(int_sk_bound_if) |
| { |
| SKIP_NONLOCAL(skb); |
| /* No error if bound_dev_if is 0, legal userspace check */ |
| dst->value = skb->sk->sk_bound_dev_if; |
| } |
| |
| META_COLLECTOR(var_sk_bound_if) |
| { |
| SKIP_NONLOCAL(skb); |
| |
| if (skb->sk->sk_bound_dev_if == 0) { |
| dst->value = (unsigned long) "any"; |
| dst->len = 3; |
| } else { |
| struct net_device *dev; |
| |
| dev = dev_get_by_index(&init_net, skb->sk->sk_bound_dev_if); |
| *err = var_dev(dev, dst); |
| if (dev) |
| dev_put(dev); |
| } |
| } |
| |
| META_COLLECTOR(int_sk_refcnt) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = atomic_read(&skb->sk->sk_refcnt); |
| } |
| |
| META_COLLECTOR(int_sk_rcvbuf) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_rcvbuf; |
| } |
| |
| META_COLLECTOR(int_sk_shutdown) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_shutdown; |
| } |
| |
| META_COLLECTOR(int_sk_proto) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_protocol; |
| } |
| |
| META_COLLECTOR(int_sk_type) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_type; |
| } |
| |
| META_COLLECTOR(int_sk_rmem_alloc) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = atomic_read(&skb->sk->sk_rmem_alloc); |
| } |
| |
| META_COLLECTOR(int_sk_wmem_alloc) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = atomic_read(&skb->sk->sk_wmem_alloc); |
| } |
| |
| META_COLLECTOR(int_sk_omem_alloc) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = atomic_read(&skb->sk->sk_omem_alloc); |
| } |
| |
| META_COLLECTOR(int_sk_rcv_qlen) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_receive_queue.qlen; |
| } |
| |
| META_COLLECTOR(int_sk_snd_qlen) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_write_queue.qlen; |
| } |
| |
| META_COLLECTOR(int_sk_wmem_queued) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_wmem_queued; |
| } |
| |
| META_COLLECTOR(int_sk_fwd_alloc) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_forward_alloc; |
| } |
| |
| META_COLLECTOR(int_sk_sndbuf) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_sndbuf; |
| } |
| |
| META_COLLECTOR(int_sk_alloc) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_allocation; |
| } |
| |
| META_COLLECTOR(int_sk_route_caps) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_route_caps; |
| } |
| |
| META_COLLECTOR(int_sk_hash) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_hash; |
| } |
| |
| META_COLLECTOR(int_sk_lingertime) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_lingertime / HZ; |
| } |
| |
| META_COLLECTOR(int_sk_err_qlen) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_error_queue.qlen; |
| } |
| |
| META_COLLECTOR(int_sk_ack_bl) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_ack_backlog; |
| } |
| |
| META_COLLECTOR(int_sk_max_ack_bl) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_max_ack_backlog; |
| } |
| |
| META_COLLECTOR(int_sk_prio) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_priority; |
| } |
| |
| META_COLLECTOR(int_sk_rcvlowat) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_rcvlowat; |
| } |
| |
| META_COLLECTOR(int_sk_rcvtimeo) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_rcvtimeo / HZ; |
| } |
| |
| META_COLLECTOR(int_sk_sndtimeo) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_sndtimeo / HZ; |
| } |
| |
| META_COLLECTOR(int_sk_sendmsg_off) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_sndmsg_off; |
| } |
| |
| META_COLLECTOR(int_sk_write_pend) |
| { |
| SKIP_NONLOCAL(skb); |
| dst->value = skb->sk->sk_write_pending; |
| } |
| |
| /************************************************************************** |
| * Meta value collectors assignment table |
| **************************************************************************/ |
| |
| struct meta_ops |
| { |
| void (*get)(struct sk_buff *, struct tcf_pkt_info *, |
| struct meta_value *, struct meta_obj *, int *); |
| }; |
| |
| #define META_ID(name) TCF_META_ID_##name |
| #define META_FUNC(name) { .get = meta_##name } |
| |
| /* Meta value operations table listing all meta value collectors and |
| * assigns them to a type and meta id. */ |
| static struct meta_ops __meta_ops[TCF_META_TYPE_MAX+1][TCF_META_ID_MAX+1] = { |
| [TCF_META_TYPE_VAR] = { |
| [META_ID(DEV)] = META_FUNC(var_dev), |
| [META_ID(SK_BOUND_IF)] = META_FUNC(var_sk_bound_if), |
| }, |
| [TCF_META_TYPE_INT] = { |
| [META_ID(RANDOM)] = META_FUNC(int_random), |
| [META_ID(LOADAVG_0)] = META_FUNC(int_loadavg_0), |
| [META_ID(LOADAVG_1)] = META_FUNC(int_loadavg_1), |
| [META_ID(LOADAVG_2)] = META_FUNC(int_loadavg_2), |
| [META_ID(DEV)] = META_FUNC(int_dev), |
| [META_ID(PRIORITY)] = META_FUNC(int_priority), |
| [META_ID(PROTOCOL)] = META_FUNC(int_protocol), |
| [META_ID(PKTTYPE)] = META_FUNC(int_pkttype), |
| [META_ID(PKTLEN)] = META_FUNC(int_pktlen), |
| [META_ID(DATALEN)] = META_FUNC(int_datalen), |
| [META_ID(MACLEN)] = META_FUNC(int_maclen), |
| [META_ID(NFMARK)] = META_FUNC(int_mark), |
| [META_ID(TCINDEX)] = META_FUNC(int_tcindex), |
| [META_ID(RTCLASSID)] = META_FUNC(int_rtclassid), |
| [META_ID(RTIIF)] = META_FUNC(int_rtiif), |
| [META_ID(SK_FAMILY)] = META_FUNC(int_sk_family), |
| [META_ID(SK_STATE)] = META_FUNC(int_sk_state), |
| [META_ID(SK_REUSE)] = META_FUNC(int_sk_reuse), |
| [META_ID(SK_BOUND_IF)] = META_FUNC(int_sk_bound_if), |
| [META_ID(SK_REFCNT)] = META_FUNC(int_sk_refcnt), |
| [META_ID(SK_RCVBUF)] = META_FUNC(int_sk_rcvbuf), |
| [META_ID(SK_SNDBUF)] = META_FUNC(int_sk_sndbuf), |
| [META_ID(SK_SHUTDOWN)] = META_FUNC(int_sk_shutdown), |
| [META_ID(SK_PROTO)] = META_FUNC(int_sk_proto), |
| [META_ID(SK_TYPE)] = META_FUNC(int_sk_type), |
| [META_ID(SK_RMEM_ALLOC)] = META_FUNC(int_sk_rmem_alloc), |
| [META_ID(SK_WMEM_ALLOC)] = META_FUNC(int_sk_wmem_alloc), |
| [META_ID(SK_OMEM_ALLOC)] = META_FUNC(int_sk_omem_alloc), |
| [META_ID(SK_WMEM_QUEUED)] = META_FUNC(int_sk_wmem_queued), |
| [META_ID(SK_RCV_QLEN)] = META_FUNC(int_sk_rcv_qlen), |
| [META_ID(SK_SND_QLEN)] = META_FUNC(int_sk_snd_qlen), |
| [META_ID(SK_ERR_QLEN)] = META_FUNC(int_sk_err_qlen), |
| [META_ID(SK_FORWARD_ALLOCS)] = META_FUNC(int_sk_fwd_alloc), |
| [META_ID(SK_ALLOCS)] = META_FUNC(int_sk_alloc), |
| [META_ID(SK_ROUTE_CAPS)] = META_FUNC(int_sk_route_caps), |
| [META_ID(SK_HASH)] = META_FUNC(int_sk_hash), |
| [META_ID(SK_LINGERTIME)] = META_FUNC(int_sk_lingertime), |
| [META_ID(SK_ACK_BACKLOG)] = META_FUNC(int_sk_ack_bl), |
| [META_ID(SK_MAX_ACK_BACKLOG)] = META_FUNC(int_sk_max_ack_bl), |
| [META_ID(SK_PRIO)] = META_FUNC(int_sk_prio), |
| [META_ID(SK_RCVLOWAT)] = META_FUNC(int_sk_rcvlowat), |
| [META_ID(SK_RCVTIMEO)] = META_FUNC(int_sk_rcvtimeo), |
| [META_ID(SK_SNDTIMEO)] = META_FUNC(int_sk_sndtimeo), |
| [META_ID(SK_SENDMSG_OFF)] = META_FUNC(int_sk_sendmsg_off), |
| [META_ID(SK_WRITE_PENDING)] = META_FUNC(int_sk_write_pend), |
| } |
| }; |
| |
| static inline struct meta_ops * meta_ops(struct meta_value *val) |
| { |
| return &__meta_ops[meta_type(val)][meta_id(val)]; |
| } |
| |
| /************************************************************************** |
| * Type specific operations for TCF_META_TYPE_VAR |
| **************************************************************************/ |
| |
| static int meta_var_compare(struct meta_obj *a, struct meta_obj *b) |
| { |
| int r = a->len - b->len; |
| |
| if (r == 0) |
| r = memcmp((void *) a->value, (void *) b->value, a->len); |
| |
| return r; |
| } |
| |
| static int meta_var_change(struct meta_value *dst, struct nlattr *nla) |
| { |
| int len = nla_len(nla); |
| |
| dst->val = (unsigned long)kmemdup(nla_data(nla), len, GFP_KERNEL); |
| if (dst->val == 0UL) |
| return -ENOMEM; |
| dst->len = len; |
| return 0; |
| } |
| |
| static void meta_var_destroy(struct meta_value *v) |
| { |
| kfree((void *) v->val); |
| } |
| |
| static void meta_var_apply_extras(struct meta_value *v, |
| struct meta_obj *dst) |
| { |
| int shift = v->hdr.shift; |
| |
| if (shift && shift < dst->len) |
| dst->len -= shift; |
| } |
| |
| static int meta_var_dump(struct sk_buff *skb, struct meta_value *v, int tlv) |
| { |
| if (v->val && v->len) |
| NLA_PUT(skb, tlv, v->len, (void *) v->val); |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| /************************************************************************** |
| * Type specific operations for TCF_META_TYPE_INT |
| **************************************************************************/ |
| |
| static int meta_int_compare(struct meta_obj *a, struct meta_obj *b) |
| { |
| /* Let gcc optimize it, the unlikely is not really based on |
| * some numbers but jump free code for mismatches seems |
| * more logical. */ |
| if (unlikely(a->value == b->value)) |
| return 0; |
| else if (a->value < b->value) |
| return -1; |
| else |
| return 1; |
| } |
| |
| static int meta_int_change(struct meta_value *dst, struct nlattr *nla) |
| { |
| if (nla_len(nla) >= sizeof(unsigned long)) { |
| dst->val = *(unsigned long *) nla_data(nla); |
| dst->len = sizeof(unsigned long); |
| } else if (nla_len(nla) == sizeof(u32)) { |
| dst->val = *(u32 *) nla_data(nla); |
| dst->len = sizeof(u32); |
| } else |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static void meta_int_apply_extras(struct meta_value *v, |
| struct meta_obj *dst) |
| { |
| if (v->hdr.shift) |
| dst->value >>= v->hdr.shift; |
| |
| if (v->val) |
| dst->value &= v->val; |
| } |
| |
| static int meta_int_dump(struct sk_buff *skb, struct meta_value *v, int tlv) |
| { |
| if (v->len == sizeof(unsigned long)) |
| NLA_PUT(skb, tlv, sizeof(unsigned long), &v->val); |
| else if (v->len == sizeof(u32)) { |
| NLA_PUT_U32(skb, tlv, v->val); |
| } |
| |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| /************************************************************************** |
| * Type specific operations table |
| **************************************************************************/ |
| |
| struct meta_type_ops |
| { |
| void (*destroy)(struct meta_value *); |
| int (*compare)(struct meta_obj *, struct meta_obj *); |
| int (*change)(struct meta_value *, struct nlattr *); |
| void (*apply_extras)(struct meta_value *, struct meta_obj *); |
| int (*dump)(struct sk_buff *, struct meta_value *, int); |
| }; |
| |
| static struct meta_type_ops __meta_type_ops[TCF_META_TYPE_MAX+1] = { |
| [TCF_META_TYPE_VAR] = { |
| .destroy = meta_var_destroy, |
| .compare = meta_var_compare, |
| .change = meta_var_change, |
| .apply_extras = meta_var_apply_extras, |
| .dump = meta_var_dump |
| }, |
| [TCF_META_TYPE_INT] = { |
| .compare = meta_int_compare, |
| .change = meta_int_change, |
| .apply_extras = meta_int_apply_extras, |
| .dump = meta_int_dump |
| } |
| }; |
| |
| static inline struct meta_type_ops * meta_type_ops(struct meta_value *v) |
| { |
| return &__meta_type_ops[meta_type(v)]; |
| } |
| |
| /************************************************************************** |
| * Core |
| **************************************************************************/ |
| |
| static inline int meta_get(struct sk_buff *skb, struct tcf_pkt_info *info, |
| struct meta_value *v, struct meta_obj *dst) |
| { |
| int err = 0; |
| |
| if (meta_id(v) == TCF_META_ID_VALUE) { |
| dst->value = v->val; |
| dst->len = v->len; |
| return 0; |
| } |
| |
| meta_ops(v)->get(skb, info, v, dst, &err); |
| if (err < 0) |
| return err; |
| |
| if (meta_type_ops(v)->apply_extras) |
| meta_type_ops(v)->apply_extras(v, dst); |
| |
| return 0; |
| } |
| |
| static int em_meta_match(struct sk_buff *skb, struct tcf_ematch *m, |
| struct tcf_pkt_info *info) |
| { |
| int r; |
| struct meta_match *meta = (struct meta_match *) m->data; |
| struct meta_obj l_value, r_value; |
| |
| if (meta_get(skb, info, &meta->lvalue, &l_value) < 0 || |
| meta_get(skb, info, &meta->rvalue, &r_value) < 0) |
| return 0; |
| |
| r = meta_type_ops(&meta->lvalue)->compare(&l_value, &r_value); |
| |
| switch (meta->lvalue.hdr.op) { |
| case TCF_EM_OPND_EQ: |
| return !r; |
| case TCF_EM_OPND_LT: |
| return r < 0; |
| case TCF_EM_OPND_GT: |
| return r > 0; |
| } |
| |
| return 0; |
| } |
| |
| static inline void meta_delete(struct meta_match *meta) |
| { |
| struct meta_type_ops *ops = meta_type_ops(&meta->lvalue); |
| |
| if (ops && ops->destroy) { |
| ops->destroy(&meta->lvalue); |
| ops->destroy(&meta->rvalue); |
| } |
| |
| kfree(meta); |
| } |
| |
| static inline int meta_change_data(struct meta_value *dst, struct nlattr *nla) |
| { |
| if (nla) { |
| if (nla_len(nla) == 0) |
| return -EINVAL; |
| |
| return meta_type_ops(dst)->change(dst, nla); |
| } |
| |
| return 0; |
| } |
| |
| static inline int meta_is_supported(struct meta_value *val) |
| { |
| return (!meta_id(val) || meta_ops(val)->get); |
| } |
| |
| static int em_meta_change(struct tcf_proto *tp, void *data, int len, |
| struct tcf_ematch *m) |
| { |
| int err; |
| struct nlattr *tb[TCA_EM_META_MAX + 1]; |
| struct tcf_meta_hdr *hdr; |
| struct meta_match *meta = NULL; |
| |
| err = nla_parse(tb, TCA_EM_META_MAX, data, len, NULL); |
| if (err < 0) |
| goto errout; |
| |
| err = -EINVAL; |
| if (tb[TCA_EM_META_HDR] == NULL || |
| nla_len(tb[TCA_EM_META_HDR]) < sizeof(*hdr)) |
| goto errout; |
| hdr = nla_data(tb[TCA_EM_META_HDR]); |
| |
| if (TCF_META_TYPE(hdr->left.kind) != TCF_META_TYPE(hdr->right.kind) || |
| TCF_META_TYPE(hdr->left.kind) > TCF_META_TYPE_MAX || |
| TCF_META_ID(hdr->left.kind) > TCF_META_ID_MAX || |
| TCF_META_ID(hdr->right.kind) > TCF_META_ID_MAX) |
| goto errout; |
| |
| meta = kzalloc(sizeof(*meta), GFP_KERNEL); |
| if (meta == NULL) |
| goto errout; |
| |
| memcpy(&meta->lvalue.hdr, &hdr->left, sizeof(hdr->left)); |
| memcpy(&meta->rvalue.hdr, &hdr->right, sizeof(hdr->right)); |
| |
| if (!meta_is_supported(&meta->lvalue) || |
| !meta_is_supported(&meta->rvalue)) { |
| err = -EOPNOTSUPP; |
| goto errout; |
| } |
| |
| if (meta_change_data(&meta->lvalue, tb[TCA_EM_META_LVALUE]) < 0 || |
| meta_change_data(&meta->rvalue, tb[TCA_EM_META_RVALUE]) < 0) |
| goto errout; |
| |
| m->datalen = sizeof(*meta); |
| m->data = (unsigned long) meta; |
| |
| err = 0; |
| errout: |
| if (err && meta) |
| meta_delete(meta); |
| return err; |
| } |
| |
| static void em_meta_destroy(struct tcf_proto *tp, struct tcf_ematch *m) |
| { |
| if (m) |
| meta_delete((struct meta_match *) m->data); |
| } |
| |
| static int em_meta_dump(struct sk_buff *skb, struct tcf_ematch *em) |
| { |
| struct meta_match *meta = (struct meta_match *) em->data; |
| struct tcf_meta_hdr hdr; |
| struct meta_type_ops *ops; |
| |
| memset(&hdr, 0, sizeof(hdr)); |
| memcpy(&hdr.left, &meta->lvalue.hdr, sizeof(hdr.left)); |
| memcpy(&hdr.right, &meta->rvalue.hdr, sizeof(hdr.right)); |
| |
| NLA_PUT(skb, TCA_EM_META_HDR, sizeof(hdr), &hdr); |
| |
| ops = meta_type_ops(&meta->lvalue); |
| if (ops->dump(skb, &meta->lvalue, TCA_EM_META_LVALUE) < 0 || |
| ops->dump(skb, &meta->rvalue, TCA_EM_META_RVALUE) < 0) |
| goto nla_put_failure; |
| |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| static struct tcf_ematch_ops em_meta_ops = { |
| .kind = TCF_EM_META, |
| .change = em_meta_change, |
| .match = em_meta_match, |
| .destroy = em_meta_destroy, |
| .dump = em_meta_dump, |
| .owner = THIS_MODULE, |
| .link = LIST_HEAD_INIT(em_meta_ops.link) |
| }; |
| |
| static int __init init_em_meta(void) |
| { |
| return tcf_em_register(&em_meta_ops); |
| } |
| |
| static void __exit exit_em_meta(void) |
| { |
| tcf_em_unregister(&em_meta_ops); |
| } |
| |
| MODULE_LICENSE("GPL"); |
| |
| module_init(init_em_meta); |
| module_exit(exit_em_meta); |
| |
| MODULE_ALIAS_TCF_EMATCH(TCF_EM_META); |