| /* |
| * net/sched/cls_flow.c Generic flow classifier |
| * |
| * Copyright (c) 2007, 2008 Patrick McHardy <kaber@trash.net> |
| * |
| * 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. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/list.h> |
| #include <linux/jhash.h> |
| #include <linux/random.h> |
| #include <linux/pkt_cls.h> |
| #include <linux/skbuff.h> |
| #include <linux/in.h> |
| #include <linux/ip.h> |
| #include <linux/ipv6.h> |
| #include <linux/if_vlan.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <net/inet_sock.h> |
| |
| #include <net/pkt_cls.h> |
| #include <net/ip.h> |
| #include <net/route.h> |
| #include <net/flow_dissector.h> |
| |
| #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
| #include <net/netfilter/nf_conntrack.h> |
| #endif |
| |
| struct flow_head { |
| struct list_head filters; |
| struct rcu_head rcu; |
| }; |
| |
| struct flow_filter { |
| struct list_head list; |
| struct tcf_exts exts; |
| struct tcf_ematch_tree ematches; |
| struct tcf_proto *tp; |
| struct timer_list perturb_timer; |
| u32 perturb_period; |
| u32 handle; |
| |
| u32 nkeys; |
| u32 keymask; |
| u32 mode; |
| u32 mask; |
| u32 xor; |
| u32 rshift; |
| u32 addend; |
| u32 divisor; |
| u32 baseclass; |
| u32 hashrnd; |
| union { |
| struct work_struct work; |
| struct rcu_head rcu; |
| }; |
| }; |
| |
| static inline u32 addr_fold(void *addr) |
| { |
| unsigned long a = (unsigned long)addr; |
| |
| return (a & 0xFFFFFFFF) ^ (BITS_PER_LONG > 32 ? a >> 32 : 0); |
| } |
| |
| static u32 flow_get_src(const struct sk_buff *skb, const struct flow_keys *flow) |
| { |
| __be32 src = flow_get_u32_src(flow); |
| |
| if (src) |
| return ntohl(src); |
| |
| return addr_fold(skb->sk); |
| } |
| |
| static u32 flow_get_dst(const struct sk_buff *skb, const struct flow_keys *flow) |
| { |
| __be32 dst = flow_get_u32_dst(flow); |
| |
| if (dst) |
| return ntohl(dst); |
| |
| return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb); |
| } |
| |
| static u32 flow_get_proto(const struct sk_buff *skb, |
| const struct flow_keys *flow) |
| { |
| return flow->basic.ip_proto; |
| } |
| |
| static u32 flow_get_proto_src(const struct sk_buff *skb, |
| const struct flow_keys *flow) |
| { |
| if (flow->ports.ports) |
| return ntohs(flow->ports.src); |
| |
| return addr_fold(skb->sk); |
| } |
| |
| static u32 flow_get_proto_dst(const struct sk_buff *skb, |
| const struct flow_keys *flow) |
| { |
| if (flow->ports.ports) |
| return ntohs(flow->ports.dst); |
| |
| return addr_fold(skb_dst(skb)) ^ (__force u16) tc_skb_protocol(skb); |
| } |
| |
| static u32 flow_get_iif(const struct sk_buff *skb) |
| { |
| return skb->skb_iif; |
| } |
| |
| static u32 flow_get_priority(const struct sk_buff *skb) |
| { |
| return skb->priority; |
| } |
| |
| static u32 flow_get_mark(const struct sk_buff *skb) |
| { |
| return skb->mark; |
| } |
| |
| static u32 flow_get_nfct(const struct sk_buff *skb) |
| { |
| #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
| return addr_fold(skb_nfct(skb)); |
| #else |
| return 0; |
| #endif |
| } |
| |
| #if IS_ENABLED(CONFIG_NF_CONNTRACK) |
| #define CTTUPLE(skb, member) \ |
| ({ \ |
| enum ip_conntrack_info ctinfo; \ |
| const struct nf_conn *ct = nf_ct_get(skb, &ctinfo); \ |
| if (ct == NULL) \ |
| goto fallback; \ |
| ct->tuplehash[CTINFO2DIR(ctinfo)].tuple.member; \ |
| }) |
| #else |
| #define CTTUPLE(skb, member) \ |
| ({ \ |
| goto fallback; \ |
| 0; \ |
| }) |
| #endif |
| |
| static u32 flow_get_nfct_src(const struct sk_buff *skb, |
| const struct flow_keys *flow) |
| { |
| switch (tc_skb_protocol(skb)) { |
| case htons(ETH_P_IP): |
| return ntohl(CTTUPLE(skb, src.u3.ip)); |
| case htons(ETH_P_IPV6): |
| return ntohl(CTTUPLE(skb, src.u3.ip6[3])); |
| } |
| fallback: |
| return flow_get_src(skb, flow); |
| } |
| |
| static u32 flow_get_nfct_dst(const struct sk_buff *skb, |
| const struct flow_keys *flow) |
| { |
| switch (tc_skb_protocol(skb)) { |
| case htons(ETH_P_IP): |
| return ntohl(CTTUPLE(skb, dst.u3.ip)); |
| case htons(ETH_P_IPV6): |
| return ntohl(CTTUPLE(skb, dst.u3.ip6[3])); |
| } |
| fallback: |
| return flow_get_dst(skb, flow); |
| } |
| |
| static u32 flow_get_nfct_proto_src(const struct sk_buff *skb, |
| const struct flow_keys *flow) |
| { |
| return ntohs(CTTUPLE(skb, src.u.all)); |
| fallback: |
| return flow_get_proto_src(skb, flow); |
| } |
| |
| static u32 flow_get_nfct_proto_dst(const struct sk_buff *skb, |
| const struct flow_keys *flow) |
| { |
| return ntohs(CTTUPLE(skb, dst.u.all)); |
| fallback: |
| return flow_get_proto_dst(skb, flow); |
| } |
| |
| static u32 flow_get_rtclassid(const struct sk_buff *skb) |
| { |
| #ifdef CONFIG_IP_ROUTE_CLASSID |
| if (skb_dst(skb)) |
| return skb_dst(skb)->tclassid; |
| #endif |
| return 0; |
| } |
| |
| static u32 flow_get_skuid(const struct sk_buff *skb) |
| { |
| struct sock *sk = skb_to_full_sk(skb); |
| |
| if (sk && sk->sk_socket && sk->sk_socket->file) { |
| kuid_t skuid = sk->sk_socket->file->f_cred->fsuid; |
| |
| return from_kuid(&init_user_ns, skuid); |
| } |
| return 0; |
| } |
| |
| static u32 flow_get_skgid(const struct sk_buff *skb) |
| { |
| struct sock *sk = skb_to_full_sk(skb); |
| |
| if (sk && sk->sk_socket && sk->sk_socket->file) { |
| kgid_t skgid = sk->sk_socket->file->f_cred->fsgid; |
| |
| return from_kgid(&init_user_ns, skgid); |
| } |
| return 0; |
| } |
| |
| static u32 flow_get_vlan_tag(const struct sk_buff *skb) |
| { |
| u16 tag; |
| |
| if (vlan_get_tag(skb, &tag) < 0) |
| return 0; |
| return tag & VLAN_VID_MASK; |
| } |
| |
| static u32 flow_get_rxhash(struct sk_buff *skb) |
| { |
| return skb_get_hash(skb); |
| } |
| |
| static u32 flow_key_get(struct sk_buff *skb, int key, struct flow_keys *flow) |
| { |
| switch (key) { |
| case FLOW_KEY_SRC: |
| return flow_get_src(skb, flow); |
| case FLOW_KEY_DST: |
| return flow_get_dst(skb, flow); |
| case FLOW_KEY_PROTO: |
| return flow_get_proto(skb, flow); |
| case FLOW_KEY_PROTO_SRC: |
| return flow_get_proto_src(skb, flow); |
| case FLOW_KEY_PROTO_DST: |
| return flow_get_proto_dst(skb, flow); |
| case FLOW_KEY_IIF: |
| return flow_get_iif(skb); |
| case FLOW_KEY_PRIORITY: |
| return flow_get_priority(skb); |
| case FLOW_KEY_MARK: |
| return flow_get_mark(skb); |
| case FLOW_KEY_NFCT: |
| return flow_get_nfct(skb); |
| case FLOW_KEY_NFCT_SRC: |
| return flow_get_nfct_src(skb, flow); |
| case FLOW_KEY_NFCT_DST: |
| return flow_get_nfct_dst(skb, flow); |
| case FLOW_KEY_NFCT_PROTO_SRC: |
| return flow_get_nfct_proto_src(skb, flow); |
| case FLOW_KEY_NFCT_PROTO_DST: |
| return flow_get_nfct_proto_dst(skb, flow); |
| case FLOW_KEY_RTCLASSID: |
| return flow_get_rtclassid(skb); |
| case FLOW_KEY_SKUID: |
| return flow_get_skuid(skb); |
| case FLOW_KEY_SKGID: |
| return flow_get_skgid(skb); |
| case FLOW_KEY_VLAN_TAG: |
| return flow_get_vlan_tag(skb); |
| case FLOW_KEY_RXHASH: |
| return flow_get_rxhash(skb); |
| default: |
| WARN_ON(1); |
| return 0; |
| } |
| } |
| |
| #define FLOW_KEYS_NEEDED ((1 << FLOW_KEY_SRC) | \ |
| (1 << FLOW_KEY_DST) | \ |
| (1 << FLOW_KEY_PROTO) | \ |
| (1 << FLOW_KEY_PROTO_SRC) | \ |
| (1 << FLOW_KEY_PROTO_DST) | \ |
| (1 << FLOW_KEY_NFCT_SRC) | \ |
| (1 << FLOW_KEY_NFCT_DST) | \ |
| (1 << FLOW_KEY_NFCT_PROTO_SRC) | \ |
| (1 << FLOW_KEY_NFCT_PROTO_DST)) |
| |
| static int flow_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
| struct tcf_result *res) |
| { |
| struct flow_head *head = rcu_dereference_bh(tp->root); |
| struct flow_filter *f; |
| u32 keymask; |
| u32 classid; |
| unsigned int n, key; |
| int r; |
| |
| list_for_each_entry_rcu(f, &head->filters, list) { |
| u32 keys[FLOW_KEY_MAX + 1]; |
| struct flow_keys flow_keys; |
| |
| if (!tcf_em_tree_match(skb, &f->ematches, NULL)) |
| continue; |
| |
| keymask = f->keymask; |
| if (keymask & FLOW_KEYS_NEEDED) |
| skb_flow_dissect_flow_keys(skb, &flow_keys, 0); |
| |
| for (n = 0; n < f->nkeys; n++) { |
| key = ffs(keymask) - 1; |
| keymask &= ~(1 << key); |
| keys[n] = flow_key_get(skb, key, &flow_keys); |
| } |
| |
| if (f->mode == FLOW_MODE_HASH) |
| classid = jhash2(keys, f->nkeys, f->hashrnd); |
| else { |
| classid = keys[0]; |
| classid = (classid & f->mask) ^ f->xor; |
| classid = (classid >> f->rshift) + f->addend; |
| } |
| |
| if (f->divisor) |
| classid %= f->divisor; |
| |
| res->class = 0; |
| res->classid = TC_H_MAKE(f->baseclass, f->baseclass + classid); |
| |
| r = tcf_exts_exec(skb, &f->exts, res); |
| if (r < 0) |
| continue; |
| return r; |
| } |
| return -1; |
| } |
| |
| static void flow_perturbation(unsigned long arg) |
| { |
| struct flow_filter *f = (struct flow_filter *)arg; |
| |
| get_random_bytes(&f->hashrnd, 4); |
| if (f->perturb_period) |
| mod_timer(&f->perturb_timer, jiffies + f->perturb_period); |
| } |
| |
| static const struct nla_policy flow_policy[TCA_FLOW_MAX + 1] = { |
| [TCA_FLOW_KEYS] = { .type = NLA_U32 }, |
| [TCA_FLOW_MODE] = { .type = NLA_U32 }, |
| [TCA_FLOW_BASECLASS] = { .type = NLA_U32 }, |
| [TCA_FLOW_RSHIFT] = { .type = NLA_U32 }, |
| [TCA_FLOW_ADDEND] = { .type = NLA_U32 }, |
| [TCA_FLOW_MASK] = { .type = NLA_U32 }, |
| [TCA_FLOW_XOR] = { .type = NLA_U32 }, |
| [TCA_FLOW_DIVISOR] = { .type = NLA_U32 }, |
| [TCA_FLOW_ACT] = { .type = NLA_NESTED }, |
| [TCA_FLOW_POLICE] = { .type = NLA_NESTED }, |
| [TCA_FLOW_EMATCHES] = { .type = NLA_NESTED }, |
| [TCA_FLOW_PERTURB] = { .type = NLA_U32 }, |
| }; |
| |
| static void __flow_destroy_filter(struct flow_filter *f) |
| { |
| del_timer_sync(&f->perturb_timer); |
| tcf_exts_destroy(&f->exts); |
| tcf_em_tree_destroy(&f->ematches); |
| tcf_exts_put_net(&f->exts); |
| kfree(f); |
| } |
| |
| static void flow_destroy_filter_work(struct work_struct *work) |
| { |
| struct flow_filter *f = container_of(work, struct flow_filter, work); |
| |
| rtnl_lock(); |
| __flow_destroy_filter(f); |
| rtnl_unlock(); |
| } |
| |
| static void flow_destroy_filter(struct rcu_head *head) |
| { |
| struct flow_filter *f = container_of(head, struct flow_filter, rcu); |
| |
| INIT_WORK(&f->work, flow_destroy_filter_work); |
| tcf_queue_work(&f->work); |
| } |
| |
| static int flow_change(struct net *net, struct sk_buff *in_skb, |
| struct tcf_proto *tp, unsigned long base, |
| u32 handle, struct nlattr **tca, |
| void **arg, bool ovr) |
| { |
| struct flow_head *head = rtnl_dereference(tp->root); |
| struct flow_filter *fold, *fnew; |
| struct nlattr *opt = tca[TCA_OPTIONS]; |
| struct nlattr *tb[TCA_FLOW_MAX + 1]; |
| unsigned int nkeys = 0; |
| unsigned int perturb_period = 0; |
| u32 baseclass = 0; |
| u32 keymask = 0; |
| u32 mode; |
| int err; |
| |
| if (opt == NULL) |
| return -EINVAL; |
| |
| err = nla_parse_nested(tb, TCA_FLOW_MAX, opt, flow_policy, NULL); |
| if (err < 0) |
| return err; |
| |
| if (tb[TCA_FLOW_BASECLASS]) { |
| baseclass = nla_get_u32(tb[TCA_FLOW_BASECLASS]); |
| if (TC_H_MIN(baseclass) == 0) |
| return -EINVAL; |
| } |
| |
| if (tb[TCA_FLOW_KEYS]) { |
| keymask = nla_get_u32(tb[TCA_FLOW_KEYS]); |
| |
| nkeys = hweight32(keymask); |
| if (nkeys == 0) |
| return -EINVAL; |
| |
| if (fls(keymask) - 1 > FLOW_KEY_MAX) |
| return -EOPNOTSUPP; |
| |
| if ((keymask & (FLOW_KEY_SKUID|FLOW_KEY_SKGID)) && |
| sk_user_ns(NETLINK_CB(in_skb).sk) != &init_user_ns) |
| return -EOPNOTSUPP; |
| } |
| |
| fnew = kzalloc(sizeof(*fnew), GFP_KERNEL); |
| if (!fnew) |
| return -ENOBUFS; |
| |
| err = tcf_em_tree_validate(tp, tb[TCA_FLOW_EMATCHES], &fnew->ematches); |
| if (err < 0) |
| goto err1; |
| |
| err = tcf_exts_init(&fnew->exts, TCA_FLOW_ACT, TCA_FLOW_POLICE); |
| if (err < 0) |
| goto err2; |
| |
| err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &fnew->exts, ovr); |
| if (err < 0) |
| goto err2; |
| |
| fold = *arg; |
| if (fold) { |
| err = -EINVAL; |
| if (fold->handle != handle && handle) |
| goto err2; |
| |
| /* Copy fold into fnew */ |
| fnew->tp = fold->tp; |
| fnew->handle = fold->handle; |
| fnew->nkeys = fold->nkeys; |
| fnew->keymask = fold->keymask; |
| fnew->mode = fold->mode; |
| fnew->mask = fold->mask; |
| fnew->xor = fold->xor; |
| fnew->rshift = fold->rshift; |
| fnew->addend = fold->addend; |
| fnew->divisor = fold->divisor; |
| fnew->baseclass = fold->baseclass; |
| fnew->hashrnd = fold->hashrnd; |
| |
| mode = fold->mode; |
| if (tb[TCA_FLOW_MODE]) |
| mode = nla_get_u32(tb[TCA_FLOW_MODE]); |
| if (mode != FLOW_MODE_HASH && nkeys > 1) |
| goto err2; |
| |
| if (mode == FLOW_MODE_HASH) |
| perturb_period = fold->perturb_period; |
| if (tb[TCA_FLOW_PERTURB]) { |
| if (mode != FLOW_MODE_HASH) |
| goto err2; |
| perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ; |
| } |
| } else { |
| err = -EINVAL; |
| if (!handle) |
| goto err2; |
| if (!tb[TCA_FLOW_KEYS]) |
| goto err2; |
| |
| mode = FLOW_MODE_MAP; |
| if (tb[TCA_FLOW_MODE]) |
| mode = nla_get_u32(tb[TCA_FLOW_MODE]); |
| if (mode != FLOW_MODE_HASH && nkeys > 1) |
| goto err2; |
| |
| if (tb[TCA_FLOW_PERTURB]) { |
| if (mode != FLOW_MODE_HASH) |
| goto err2; |
| perturb_period = nla_get_u32(tb[TCA_FLOW_PERTURB]) * HZ; |
| } |
| |
| if (TC_H_MAJ(baseclass) == 0) |
| baseclass = TC_H_MAKE(tp->q->handle, baseclass); |
| if (TC_H_MIN(baseclass) == 0) |
| baseclass = TC_H_MAKE(baseclass, 1); |
| |
| fnew->handle = handle; |
| fnew->mask = ~0U; |
| fnew->tp = tp; |
| get_random_bytes(&fnew->hashrnd, 4); |
| } |
| |
| setup_deferrable_timer(&fnew->perturb_timer, flow_perturbation, |
| (unsigned long)fnew); |
| |
| netif_keep_dst(qdisc_dev(tp->q)); |
| |
| if (tb[TCA_FLOW_KEYS]) { |
| fnew->keymask = keymask; |
| fnew->nkeys = nkeys; |
| } |
| |
| fnew->mode = mode; |
| |
| if (tb[TCA_FLOW_MASK]) |
| fnew->mask = nla_get_u32(tb[TCA_FLOW_MASK]); |
| if (tb[TCA_FLOW_XOR]) |
| fnew->xor = nla_get_u32(tb[TCA_FLOW_XOR]); |
| if (tb[TCA_FLOW_RSHIFT]) |
| fnew->rshift = nla_get_u32(tb[TCA_FLOW_RSHIFT]); |
| if (tb[TCA_FLOW_ADDEND]) |
| fnew->addend = nla_get_u32(tb[TCA_FLOW_ADDEND]); |
| |
| if (tb[TCA_FLOW_DIVISOR]) |
| fnew->divisor = nla_get_u32(tb[TCA_FLOW_DIVISOR]); |
| if (baseclass) |
| fnew->baseclass = baseclass; |
| |
| fnew->perturb_period = perturb_period; |
| if (perturb_period) |
| mod_timer(&fnew->perturb_timer, jiffies + perturb_period); |
| |
| if (!*arg) |
| list_add_tail_rcu(&fnew->list, &head->filters); |
| else |
| list_replace_rcu(&fold->list, &fnew->list); |
| |
| *arg = fnew; |
| |
| if (fold) { |
| tcf_exts_get_net(&fold->exts); |
| call_rcu(&fold->rcu, flow_destroy_filter); |
| } |
| return 0; |
| |
| err2: |
| tcf_exts_destroy(&fnew->exts); |
| tcf_em_tree_destroy(&fnew->ematches); |
| err1: |
| kfree(fnew); |
| return err; |
| } |
| |
| static int flow_delete(struct tcf_proto *tp, void *arg, bool *last) |
| { |
| struct flow_head *head = rtnl_dereference(tp->root); |
| struct flow_filter *f = arg; |
| |
| list_del_rcu(&f->list); |
| tcf_exts_get_net(&f->exts); |
| call_rcu(&f->rcu, flow_destroy_filter); |
| *last = list_empty(&head->filters); |
| return 0; |
| } |
| |
| static int flow_init(struct tcf_proto *tp) |
| { |
| struct flow_head *head; |
| |
| head = kzalloc(sizeof(*head), GFP_KERNEL); |
| if (head == NULL) |
| return -ENOBUFS; |
| INIT_LIST_HEAD(&head->filters); |
| rcu_assign_pointer(tp->root, head); |
| return 0; |
| } |
| |
| static void flow_destroy(struct tcf_proto *tp) |
| { |
| struct flow_head *head = rtnl_dereference(tp->root); |
| struct flow_filter *f, *next; |
| |
| list_for_each_entry_safe(f, next, &head->filters, list) { |
| list_del_rcu(&f->list); |
| if (tcf_exts_get_net(&f->exts)) |
| call_rcu(&f->rcu, flow_destroy_filter); |
| else |
| __flow_destroy_filter(f); |
| } |
| kfree_rcu(head, rcu); |
| } |
| |
| static void *flow_get(struct tcf_proto *tp, u32 handle) |
| { |
| struct flow_head *head = rtnl_dereference(tp->root); |
| struct flow_filter *f; |
| |
| list_for_each_entry(f, &head->filters, list) |
| if (f->handle == handle) |
| return f; |
| return NULL; |
| } |
| |
| static int flow_dump(struct net *net, struct tcf_proto *tp, void *fh, |
| struct sk_buff *skb, struct tcmsg *t) |
| { |
| struct flow_filter *f = fh; |
| struct nlattr *nest; |
| |
| if (f == NULL) |
| return skb->len; |
| |
| t->tcm_handle = f->handle; |
| |
| nest = nla_nest_start(skb, TCA_OPTIONS); |
| if (nest == NULL) |
| goto nla_put_failure; |
| |
| if (nla_put_u32(skb, TCA_FLOW_KEYS, f->keymask) || |
| nla_put_u32(skb, TCA_FLOW_MODE, f->mode)) |
| goto nla_put_failure; |
| |
| if (f->mask != ~0 || f->xor != 0) { |
| if (nla_put_u32(skb, TCA_FLOW_MASK, f->mask) || |
| nla_put_u32(skb, TCA_FLOW_XOR, f->xor)) |
| goto nla_put_failure; |
| } |
| if (f->rshift && |
| nla_put_u32(skb, TCA_FLOW_RSHIFT, f->rshift)) |
| goto nla_put_failure; |
| if (f->addend && |
| nla_put_u32(skb, TCA_FLOW_ADDEND, f->addend)) |
| goto nla_put_failure; |
| |
| if (f->divisor && |
| nla_put_u32(skb, TCA_FLOW_DIVISOR, f->divisor)) |
| goto nla_put_failure; |
| if (f->baseclass && |
| nla_put_u32(skb, TCA_FLOW_BASECLASS, f->baseclass)) |
| goto nla_put_failure; |
| |
| if (f->perturb_period && |
| nla_put_u32(skb, TCA_FLOW_PERTURB, f->perturb_period / HZ)) |
| goto nla_put_failure; |
| |
| if (tcf_exts_dump(skb, &f->exts) < 0) |
| goto nla_put_failure; |
| #ifdef CONFIG_NET_EMATCH |
| if (f->ematches.hdr.nmatches && |
| tcf_em_tree_dump(skb, &f->ematches, TCA_FLOW_EMATCHES) < 0) |
| goto nla_put_failure; |
| #endif |
| nla_nest_end(skb, nest); |
| |
| if (tcf_exts_dump_stats(skb, &f->exts) < 0) |
| goto nla_put_failure; |
| |
| return skb->len; |
| |
| nla_put_failure: |
| nla_nest_cancel(skb, nest); |
| return -1; |
| } |
| |
| static void flow_walk(struct tcf_proto *tp, struct tcf_walker *arg) |
| { |
| struct flow_head *head = rtnl_dereference(tp->root); |
| struct flow_filter *f; |
| |
| list_for_each_entry(f, &head->filters, list) { |
| if (arg->count < arg->skip) |
| goto skip; |
| if (arg->fn(tp, f, arg) < 0) { |
| arg->stop = 1; |
| break; |
| } |
| skip: |
| arg->count++; |
| } |
| } |
| |
| static struct tcf_proto_ops cls_flow_ops __read_mostly = { |
| .kind = "flow", |
| .classify = flow_classify, |
| .init = flow_init, |
| .destroy = flow_destroy, |
| .change = flow_change, |
| .delete = flow_delete, |
| .get = flow_get, |
| .dump = flow_dump, |
| .walk = flow_walk, |
| .owner = THIS_MODULE, |
| }; |
| |
| static int __init cls_flow_init(void) |
| { |
| return register_tcf_proto_ops(&cls_flow_ops); |
| } |
| |
| static void __exit cls_flow_exit(void) |
| { |
| unregister_tcf_proto_ops(&cls_flow_ops); |
| } |
| |
| module_init(cls_flow_init); |
| module_exit(cls_flow_exit); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>"); |
| MODULE_DESCRIPTION("TC flow classifier"); |