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538 lines
12 KiB
538 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* net/sched/act_pedit.c Generic packet editor |
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* |
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* Authors: Jamal Hadi Salim (2002-4) |
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*/ |
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|
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/errno.h> |
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#include <linux/skbuff.h> |
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#include <linux/rtnetlink.h> |
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#include <linux/module.h> |
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#include <linux/init.h> |
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#include <linux/slab.h> |
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#include <net/netlink.h> |
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#include <net/pkt_sched.h> |
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#include <linux/tc_act/tc_pedit.h> |
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#include <net/tc_act/tc_pedit.h> |
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#include <uapi/linux/tc_act/tc_pedit.h> |
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#include <net/pkt_cls.h> |
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static unsigned int pedit_net_id; |
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static struct tc_action_ops act_pedit_ops; |
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static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = { |
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[TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) }, |
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[TCA_PEDIT_KEYS_EX] = { .type = NLA_NESTED }, |
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}; |
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static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = { |
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[TCA_PEDIT_KEY_EX_HTYPE] = { .type = NLA_U16 }, |
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[TCA_PEDIT_KEY_EX_CMD] = { .type = NLA_U16 }, |
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}; |
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static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla, |
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u8 n) |
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{ |
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struct tcf_pedit_key_ex *keys_ex; |
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struct tcf_pedit_key_ex *k; |
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const struct nlattr *ka; |
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int err = -EINVAL; |
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int rem; |
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if (!nla) |
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return NULL; |
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keys_ex = kcalloc(n, sizeof(*k), GFP_KERNEL); |
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if (!keys_ex) |
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return ERR_PTR(-ENOMEM); |
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k = keys_ex; |
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nla_for_each_nested(ka, nla, rem) { |
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struct nlattr *tb[TCA_PEDIT_KEY_EX_MAX + 1]; |
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if (!n) { |
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err = -EINVAL; |
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goto err_out; |
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} |
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n--; |
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if (nla_type(ka) != TCA_PEDIT_KEY_EX) { |
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err = -EINVAL; |
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goto err_out; |
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} |
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err = nla_parse_nested_deprecated(tb, TCA_PEDIT_KEY_EX_MAX, |
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ka, pedit_key_ex_policy, |
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NULL); |
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if (err) |
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goto err_out; |
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if (!tb[TCA_PEDIT_KEY_EX_HTYPE] || |
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!tb[TCA_PEDIT_KEY_EX_CMD]) { |
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err = -EINVAL; |
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goto err_out; |
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} |
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k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]); |
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k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]); |
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if (k->htype > TCA_PEDIT_HDR_TYPE_MAX || |
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k->cmd > TCA_PEDIT_CMD_MAX) { |
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err = -EINVAL; |
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goto err_out; |
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} |
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k++; |
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} |
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if (n) { |
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err = -EINVAL; |
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goto err_out; |
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} |
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return keys_ex; |
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err_out: |
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kfree(keys_ex); |
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return ERR_PTR(err); |
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} |
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static int tcf_pedit_key_ex_dump(struct sk_buff *skb, |
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struct tcf_pedit_key_ex *keys_ex, int n) |
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{ |
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struct nlattr *keys_start = nla_nest_start_noflag(skb, |
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TCA_PEDIT_KEYS_EX); |
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if (!keys_start) |
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goto nla_failure; |
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for (; n > 0; n--) { |
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struct nlattr *key_start; |
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key_start = nla_nest_start_noflag(skb, TCA_PEDIT_KEY_EX); |
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if (!key_start) |
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goto nla_failure; |
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if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) || |
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nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd)) |
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goto nla_failure; |
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nla_nest_end(skb, key_start); |
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keys_ex++; |
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} |
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nla_nest_end(skb, keys_start); |
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return 0; |
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nla_failure: |
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nla_nest_cancel(skb, keys_start); |
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return -EINVAL; |
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} |
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static int tcf_pedit_init(struct net *net, struct nlattr *nla, |
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struct nlattr *est, struct tc_action **a, |
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int ovr, int bind, bool rtnl_held, |
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struct tcf_proto *tp, u32 flags, |
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struct netlink_ext_ack *extack) |
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{ |
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struct tc_action_net *tn = net_generic(net, pedit_net_id); |
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struct nlattr *tb[TCA_PEDIT_MAX + 1]; |
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struct tcf_chain *goto_ch = NULL; |
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struct tc_pedit_key *keys = NULL; |
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struct tcf_pedit_key_ex *keys_ex; |
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struct tc_pedit *parm; |
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struct nlattr *pattr; |
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struct tcf_pedit *p; |
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int ret = 0, err; |
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int ksize; |
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u32 index; |
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if (!nla) { |
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NL_SET_ERR_MSG_MOD(extack, "Pedit requires attributes to be passed"); |
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return -EINVAL; |
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} |
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err = nla_parse_nested_deprecated(tb, TCA_PEDIT_MAX, nla, |
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pedit_policy, NULL); |
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if (err < 0) |
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return err; |
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pattr = tb[TCA_PEDIT_PARMS]; |
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if (!pattr) |
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pattr = tb[TCA_PEDIT_PARMS_EX]; |
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if (!pattr) { |
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NL_SET_ERR_MSG_MOD(extack, "Missing required TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute"); |
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return -EINVAL; |
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} |
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parm = nla_data(pattr); |
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if (!parm->nkeys) { |
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NL_SET_ERR_MSG_MOD(extack, "Pedit requires keys to be passed"); |
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return -EINVAL; |
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} |
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ksize = parm->nkeys * sizeof(struct tc_pedit_key); |
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if (nla_len(pattr) < sizeof(*parm) + ksize) { |
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NL_SET_ERR_MSG_ATTR(extack, pattr, "Length of TCA_PEDIT_PARMS or TCA_PEDIT_PARMS_EX pedit attribute is invalid"); |
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return -EINVAL; |
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} |
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keys_ex = tcf_pedit_keys_ex_parse(tb[TCA_PEDIT_KEYS_EX], parm->nkeys); |
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if (IS_ERR(keys_ex)) |
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return PTR_ERR(keys_ex); |
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index = parm->index; |
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err = tcf_idr_check_alloc(tn, &index, a, bind); |
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if (!err) { |
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ret = tcf_idr_create(tn, index, est, a, |
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&act_pedit_ops, bind, false, 0); |
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if (ret) { |
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tcf_idr_cleanup(tn, index); |
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goto out_free; |
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} |
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ret = ACT_P_CREATED; |
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} else if (err > 0) { |
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if (bind) |
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goto out_free; |
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if (!ovr) { |
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ret = -EEXIST; |
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goto out_release; |
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} |
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} else { |
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ret = err; |
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goto out_free; |
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} |
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err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); |
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if (err < 0) { |
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ret = err; |
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goto out_release; |
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} |
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p = to_pedit(*a); |
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spin_lock_bh(&p->tcf_lock); |
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if (ret == ACT_P_CREATED || |
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(p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys)) { |
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keys = kmalloc(ksize, GFP_ATOMIC); |
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if (!keys) { |
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spin_unlock_bh(&p->tcf_lock); |
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ret = -ENOMEM; |
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goto put_chain; |
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} |
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kfree(p->tcfp_keys); |
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p->tcfp_keys = keys; |
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p->tcfp_nkeys = parm->nkeys; |
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} |
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memcpy(p->tcfp_keys, parm->keys, ksize); |
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p->tcfp_flags = parm->flags; |
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goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
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kfree(p->tcfp_keys_ex); |
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p->tcfp_keys_ex = keys_ex; |
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spin_unlock_bh(&p->tcf_lock); |
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if (goto_ch) |
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tcf_chain_put_by_act(goto_ch); |
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return ret; |
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put_chain: |
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if (goto_ch) |
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tcf_chain_put_by_act(goto_ch); |
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out_release: |
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tcf_idr_release(*a, bind); |
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out_free: |
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kfree(keys_ex); |
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return ret; |
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} |
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static void tcf_pedit_cleanup(struct tc_action *a) |
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{ |
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struct tcf_pedit *p = to_pedit(a); |
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struct tc_pedit_key *keys = p->tcfp_keys; |
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kfree(keys); |
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kfree(p->tcfp_keys_ex); |
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} |
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static bool offset_valid(struct sk_buff *skb, int offset) |
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{ |
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if (offset > 0 && offset > skb->len) |
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return false; |
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if (offset < 0 && -offset > skb_headroom(skb)) |
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return false; |
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return true; |
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} |
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static int pedit_skb_hdr_offset(struct sk_buff *skb, |
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enum pedit_header_type htype, int *hoffset) |
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{ |
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int ret = -EINVAL; |
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switch (htype) { |
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case TCA_PEDIT_KEY_EX_HDR_TYPE_ETH: |
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if (skb_mac_header_was_set(skb)) { |
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*hoffset = skb_mac_offset(skb); |
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ret = 0; |
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} |
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break; |
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case TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK: |
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case TCA_PEDIT_KEY_EX_HDR_TYPE_IP4: |
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case TCA_PEDIT_KEY_EX_HDR_TYPE_IP6: |
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*hoffset = skb_network_offset(skb); |
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ret = 0; |
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break; |
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case TCA_PEDIT_KEY_EX_HDR_TYPE_TCP: |
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case TCA_PEDIT_KEY_EX_HDR_TYPE_UDP: |
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if (skb_transport_header_was_set(skb)) { |
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*hoffset = skb_transport_offset(skb); |
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ret = 0; |
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} |
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break; |
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default: |
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ret = -EINVAL; |
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break; |
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} |
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return ret; |
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} |
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static int tcf_pedit_act(struct sk_buff *skb, const struct tc_action *a, |
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struct tcf_result *res) |
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{ |
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struct tcf_pedit *p = to_pedit(a); |
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int i; |
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if (skb_unclone(skb, GFP_ATOMIC)) |
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return p->tcf_action; |
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spin_lock(&p->tcf_lock); |
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tcf_lastuse_update(&p->tcf_tm); |
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if (p->tcfp_nkeys > 0) { |
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struct tc_pedit_key *tkey = p->tcfp_keys; |
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struct tcf_pedit_key_ex *tkey_ex = p->tcfp_keys_ex; |
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enum pedit_header_type htype = |
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TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK; |
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enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET; |
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for (i = p->tcfp_nkeys; i > 0; i--, tkey++) { |
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u32 *ptr, hdata; |
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int offset = tkey->off; |
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int hoffset; |
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u32 val; |
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int rc; |
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if (tkey_ex) { |
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htype = tkey_ex->htype; |
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cmd = tkey_ex->cmd; |
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tkey_ex++; |
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} |
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rc = pedit_skb_hdr_offset(skb, htype, &hoffset); |
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if (rc) { |
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pr_info("tc action pedit bad header type specified (0x%x)\n", |
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htype); |
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goto bad; |
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} |
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if (tkey->offmask) { |
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u8 *d, _d; |
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if (!offset_valid(skb, hoffset + tkey->at)) { |
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pr_info("tc action pedit 'at' offset %d out of bounds\n", |
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hoffset + tkey->at); |
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goto bad; |
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} |
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d = skb_header_pointer(skb, hoffset + tkey->at, |
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sizeof(_d), &_d); |
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if (!d) |
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goto bad; |
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offset += (*d & tkey->offmask) >> tkey->shift; |
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} |
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if (offset % 4) { |
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pr_info("tc action pedit offset must be on 32 bit boundaries\n"); |
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goto bad; |
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} |
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if (!offset_valid(skb, hoffset + offset)) { |
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pr_info("tc action pedit offset %d out of bounds\n", |
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hoffset + offset); |
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goto bad; |
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} |
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ptr = skb_header_pointer(skb, hoffset + offset, |
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sizeof(hdata), &hdata); |
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if (!ptr) |
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goto bad; |
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/* just do it, baby */ |
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switch (cmd) { |
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case TCA_PEDIT_KEY_EX_CMD_SET: |
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val = tkey->val; |
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break; |
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case TCA_PEDIT_KEY_EX_CMD_ADD: |
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val = (*ptr + tkey->val) & ~tkey->mask; |
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break; |
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default: |
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pr_info("tc action pedit bad command (%d)\n", |
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cmd); |
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goto bad; |
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} |
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*ptr = ((*ptr & tkey->mask) ^ val); |
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if (ptr == &hdata) |
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skb_store_bits(skb, hoffset + offset, ptr, 4); |
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} |
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goto done; |
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} else { |
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WARN(1, "pedit BUG: index %d\n", p->tcf_index); |
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} |
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bad: |
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p->tcf_qstats.overlimits++; |
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done: |
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bstats_update(&p->tcf_bstats, skb); |
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spin_unlock(&p->tcf_lock); |
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return p->tcf_action; |
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} |
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static void tcf_pedit_stats_update(struct tc_action *a, u64 bytes, u64 packets, |
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u64 drops, u64 lastuse, bool hw) |
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{ |
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struct tcf_pedit *d = to_pedit(a); |
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struct tcf_t *tm = &d->tcf_tm; |
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tcf_action_update_stats(a, bytes, packets, drops, hw); |
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tm->lastuse = max_t(u64, tm->lastuse, lastuse); |
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} |
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static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a, |
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int bind, int ref) |
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{ |
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unsigned char *b = skb_tail_pointer(skb); |
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struct tcf_pedit *p = to_pedit(a); |
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struct tc_pedit *opt; |
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struct tcf_t t; |
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int s; |
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s = struct_size(opt, keys, p->tcfp_nkeys); |
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/* netlink spinlocks held above us - must use ATOMIC */ |
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opt = kzalloc(s, GFP_ATOMIC); |
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if (unlikely(!opt)) |
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return -ENOBUFS; |
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spin_lock_bh(&p->tcf_lock); |
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memcpy(opt->keys, p->tcfp_keys, flex_array_size(opt, keys, p->tcfp_nkeys)); |
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opt->index = p->tcf_index; |
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opt->nkeys = p->tcfp_nkeys; |
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opt->flags = p->tcfp_flags; |
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opt->action = p->tcf_action; |
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opt->refcnt = refcount_read(&p->tcf_refcnt) - ref; |
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opt->bindcnt = atomic_read(&p->tcf_bindcnt) - bind; |
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if (p->tcfp_keys_ex) { |
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if (tcf_pedit_key_ex_dump(skb, |
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p->tcfp_keys_ex, |
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p->tcfp_nkeys)) |
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goto nla_put_failure; |
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if (nla_put(skb, TCA_PEDIT_PARMS_EX, s, opt)) |
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goto nla_put_failure; |
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} else { |
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if (nla_put(skb, TCA_PEDIT_PARMS, s, opt)) |
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goto nla_put_failure; |
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} |
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tcf_tm_dump(&t, &p->tcf_tm); |
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if (nla_put_64bit(skb, TCA_PEDIT_TM, sizeof(t), &t, TCA_PEDIT_PAD)) |
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goto nla_put_failure; |
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spin_unlock_bh(&p->tcf_lock); |
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kfree(opt); |
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return skb->len; |
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nla_put_failure: |
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spin_unlock_bh(&p->tcf_lock); |
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nlmsg_trim(skb, b); |
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kfree(opt); |
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return -1; |
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} |
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static int tcf_pedit_walker(struct net *net, struct sk_buff *skb, |
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struct netlink_callback *cb, int type, |
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const struct tc_action_ops *ops, |
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struct netlink_ext_ack *extack) |
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{ |
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struct tc_action_net *tn = net_generic(net, pedit_net_id); |
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return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
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} |
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static int tcf_pedit_search(struct net *net, struct tc_action **a, u32 index) |
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{ |
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struct tc_action_net *tn = net_generic(net, pedit_net_id); |
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return tcf_idr_search(tn, a, index); |
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} |
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static struct tc_action_ops act_pedit_ops = { |
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.kind = "pedit", |
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.id = TCA_ID_PEDIT, |
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.owner = THIS_MODULE, |
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.act = tcf_pedit_act, |
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.stats_update = tcf_pedit_stats_update, |
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.dump = tcf_pedit_dump, |
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.cleanup = tcf_pedit_cleanup, |
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.init = tcf_pedit_init, |
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.walk = tcf_pedit_walker, |
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.lookup = tcf_pedit_search, |
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.size = sizeof(struct tcf_pedit), |
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}; |
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static __net_init int pedit_init_net(struct net *net) |
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{ |
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struct tc_action_net *tn = net_generic(net, pedit_net_id); |
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return tc_action_net_init(net, tn, &act_pedit_ops); |
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} |
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static void __net_exit pedit_exit_net(struct list_head *net_list) |
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{ |
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tc_action_net_exit(net_list, pedit_net_id); |
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} |
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|
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static struct pernet_operations pedit_net_ops = { |
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.init = pedit_init_net, |
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.exit_batch = pedit_exit_net, |
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.id = &pedit_net_id, |
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.size = sizeof(struct tc_action_net), |
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}; |
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|
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MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); |
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MODULE_DESCRIPTION("Generic Packet Editor actions"); |
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MODULE_LICENSE("GPL"); |
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|
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static int __init pedit_init_module(void) |
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{ |
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return tcf_register_action(&act_pedit_ops, &pedit_net_ops); |
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} |
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static void __exit pedit_cleanup_module(void) |
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{ |
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tcf_unregister_action(&act_pedit_ops, &pedit_net_ops); |
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} |
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module_init(pedit_init_module); |
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module_exit(pedit_cleanup_module);
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