Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-or-later
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * net/sched/act_skbmod.c  skb data modifier
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (c) 2016 Jamal Hadi Salim <jhs@mojatatu.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) #include <linux/if_arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/skbuff.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/rtnetlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <net/netlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <net/pkt_sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <net/pkt_cls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) #include <linux/tc_act/tc_skbmod.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #include <net/tc_act/tc_skbmod.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) static unsigned int skbmod_net_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) static struct tc_action_ops act_skbmod_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #define MAX_EDIT_LEN ETH_HLEN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) static int tcf_skbmod_act(struct sk_buff *skb, const struct tc_action *a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 			  struct tcf_result *res)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 	struct tcf_skbmod *d = to_skbmod(a);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	int action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 	struct tcf_skbmod_params *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	u64 flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 	tcf_lastuse_update(&d->tcf_tm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	action = READ_ONCE(d->tcf_action);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	if (unlikely(action == TC_ACT_SHOT))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 		goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	if (!skb->dev || skb->dev->type != ARPHRD_ETHER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 		return action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 	/* XXX: if you are going to edit more fields beyond ethernet header
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 	 * (example when you add IP header replacement or vlan swap)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 	 * then MAX_EDIT_LEN needs to change appropriately
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 	*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	err = skb_ensure_writable(skb, MAX_EDIT_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	if (unlikely(err)) /* best policy is to drop on the floor */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 		goto drop;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	p = rcu_dereference_bh(d->skbmod_p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	flags = p->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	if (flags & SKBMOD_F_DMAC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 		ether_addr_copy(eth_hdr(skb)->h_dest, p->eth_dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	if (flags & SKBMOD_F_SMAC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		ether_addr_copy(eth_hdr(skb)->h_source, p->eth_src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	if (flags & SKBMOD_F_ETYPE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 		eth_hdr(skb)->h_proto = p->eth_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	if (flags & SKBMOD_F_SWAPMAC) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		u16 tmpaddr[ETH_ALEN / 2]; /* ether_addr_copy() requirement */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		/*XXX: I am sure we can come up with more efficient swapping*/
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		ether_addr_copy((u8 *)tmpaddr, eth_hdr(skb)->h_dest);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 		ether_addr_copy(eth_hdr(skb)->h_dest, eth_hdr(skb)->h_source);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		ether_addr_copy(eth_hdr(skb)->h_source, (u8 *)tmpaddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 	return action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) drop:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	qstats_overlimit_inc(this_cpu_ptr(d->common.cpu_qstats));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	return TC_ACT_SHOT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) static const struct nla_policy skbmod_policy[TCA_SKBMOD_MAX + 1] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	[TCA_SKBMOD_PARMS]		= { .len = sizeof(struct tc_skbmod) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 	[TCA_SKBMOD_DMAC]		= { .len = ETH_ALEN },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 	[TCA_SKBMOD_SMAC]		= { .len = ETH_ALEN },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 	[TCA_SKBMOD_ETYPE]		= { .type = NLA_U16 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) static int tcf_skbmod_init(struct net *net, struct nlattr *nla,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 			   struct nlattr *est, struct tc_action **a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 			   int ovr, int bind, bool rtnl_held,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 			   struct tcf_proto *tp, u32 flags,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 			   struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	struct tc_action_net *tn = net_generic(net, skbmod_net_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	struct nlattr *tb[TCA_SKBMOD_MAX + 1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 	struct tcf_skbmod_params *p, *p_old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 	struct tcf_chain *goto_ch = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	struct tc_skbmod *parm;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	u32 lflags = 0, index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	struct tcf_skbmod *d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	bool exists = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	u8 *daddr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 	u8 *saddr = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 	u16 eth_type = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	int ret = 0, err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if (!nla)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	err = nla_parse_nested_deprecated(tb, TCA_SKBMOD_MAX, nla,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 					  skbmod_policy, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 	if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	if (!tb[TCA_SKBMOD_PARMS])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	if (tb[TCA_SKBMOD_DMAC]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 		daddr = nla_data(tb[TCA_SKBMOD_DMAC]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 		lflags |= SKBMOD_F_DMAC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	if (tb[TCA_SKBMOD_SMAC]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 		saddr = nla_data(tb[TCA_SKBMOD_SMAC]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 		lflags |= SKBMOD_F_SMAC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	if (tb[TCA_SKBMOD_ETYPE]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		eth_type = nla_get_u16(tb[TCA_SKBMOD_ETYPE]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 		lflags |= SKBMOD_F_ETYPE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	parm = nla_data(tb[TCA_SKBMOD_PARMS]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	index = parm->index;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	if (parm->flags & SKBMOD_F_SWAPMAC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 		lflags = SKBMOD_F_SWAPMAC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	err = tcf_idr_check_alloc(tn, &index, a, bind);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 	if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 	exists = err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 	if (exists && bind)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	if (!lflags) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 		if (exists)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 			tcf_idr_release(*a, bind);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 		else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 			tcf_idr_cleanup(tn, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	if (!exists) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		ret = tcf_idr_create(tn, index, est, a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 				     &act_skbmod_ops, bind, true, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 			tcf_idr_cleanup(tn, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 			return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 		ret = ACT_P_CREATED;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 	} else if (!ovr) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 		tcf_idr_release(*a, bind);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 		return -EEXIST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 	if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 		goto release_idr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	d = to_skbmod(*a);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	p = kzalloc(sizeof(struct tcf_skbmod_params), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	if (unlikely(!p)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 		err = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 		goto put_chain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	p->flags = lflags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	if (ovr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 		spin_lock_bh(&d->tcf_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	/* Protected by tcf_lock if overwriting existing action. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	p_old = rcu_dereference_protected(d->skbmod_p, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	if (lflags & SKBMOD_F_DMAC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		ether_addr_copy(p->eth_dst, daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	if (lflags & SKBMOD_F_SMAC)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 		ether_addr_copy(p->eth_src, saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	if (lflags & SKBMOD_F_ETYPE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 		p->eth_type = htons(eth_type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 	rcu_assign_pointer(d->skbmod_p, p);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	if (ovr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 		spin_unlock_bh(&d->tcf_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 	if (p_old)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 		kfree_rcu(p_old, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 	if (goto_ch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		tcf_chain_put_by_act(goto_ch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) put_chain:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	if (goto_ch)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 		tcf_chain_put_by_act(goto_ch);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) release_idr:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	tcf_idr_release(*a, bind);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) static void tcf_skbmod_cleanup(struct tc_action *a)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	struct tcf_skbmod *d = to_skbmod(a);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	struct tcf_skbmod_params  *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 	p = rcu_dereference_protected(d->skbmod_p, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	if (p)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 		kfree_rcu(p, rcu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static int tcf_skbmod_dump(struct sk_buff *skb, struct tc_action *a,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 			   int bind, int ref)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	struct tcf_skbmod *d = to_skbmod(a);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	unsigned char *b = skb_tail_pointer(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	struct tcf_skbmod_params  *p;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	struct tc_skbmod opt = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 		.index   = d->tcf_index,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 		.refcnt  = refcount_read(&d->tcf_refcnt) - ref,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 		.bindcnt = atomic_read(&d->tcf_bindcnt) - bind,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 	struct tcf_t t;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	spin_lock_bh(&d->tcf_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 	opt.action = d->tcf_action;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	p = rcu_dereference_protected(d->skbmod_p,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 				      lockdep_is_held(&d->tcf_lock));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 	opt.flags  = p->flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	if (nla_put(skb, TCA_SKBMOD_PARMS, sizeof(opt), &opt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		goto nla_put_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 	if ((p->flags & SKBMOD_F_DMAC) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	    nla_put(skb, TCA_SKBMOD_DMAC, ETH_ALEN, p->eth_dst))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		goto nla_put_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 	if ((p->flags & SKBMOD_F_SMAC) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	    nla_put(skb, TCA_SKBMOD_SMAC, ETH_ALEN, p->eth_src))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 		goto nla_put_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 	if ((p->flags & SKBMOD_F_ETYPE) &&
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 	    nla_put_u16(skb, TCA_SKBMOD_ETYPE, ntohs(p->eth_type)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 		goto nla_put_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 	tcf_tm_dump(&t, &d->tcf_tm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 	if (nla_put_64bit(skb, TCA_SKBMOD_TM, sizeof(t), &t, TCA_SKBMOD_PAD))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 		goto nla_put_failure;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	spin_unlock_bh(&d->tcf_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	return skb->len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) nla_put_failure:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	spin_unlock_bh(&d->tcf_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	nlmsg_trim(skb, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	return -1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) static int tcf_skbmod_walker(struct net *net, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 			     struct netlink_callback *cb, int type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 			     const struct tc_action_ops *ops,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 			     struct netlink_ext_ack *extack)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) 	struct tc_action_net *tn = net_generic(net, skbmod_net_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	return tcf_generic_walker(tn, skb, cb, type, ops, extack);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) static int tcf_skbmod_search(struct net *net, struct tc_action **a, u32 index)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) 	struct tc_action_net *tn = net_generic(net, skbmod_net_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) 	return tcf_idr_search(tn, a, index);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) static struct tc_action_ops act_skbmod_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	.kind		=	"skbmod",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	.id		=	TCA_ACT_SKBMOD,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	.owner		=	THIS_MODULE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 	.act		=	tcf_skbmod_act,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	.dump		=	tcf_skbmod_dump,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 	.init		=	tcf_skbmod_init,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 	.cleanup	=	tcf_skbmod_cleanup,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	.walk		=	tcf_skbmod_walker,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	.lookup		=	tcf_skbmod_search,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	.size		=	sizeof(struct tcf_skbmod),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) static __net_init int skbmod_init_net(struct net *net)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	struct tc_action_net *tn = net_generic(net, skbmod_net_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	return tc_action_net_init(net, tn, &act_skbmod_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) static void __net_exit skbmod_exit_net(struct list_head *net_list)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 	tc_action_net_exit(net_list, skbmod_net_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) static struct pernet_operations skbmod_net_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	.init = skbmod_init_net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 	.exit_batch = skbmod_exit_net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 	.id   = &skbmod_net_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) 	.size = sizeof(struct tc_action_net),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) MODULE_AUTHOR("Jamal Hadi Salim, <jhs@mojatatu.com>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) MODULE_DESCRIPTION("SKB data mod-ing");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) static int __init skbmod_init_module(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	return tcf_register_action(&act_skbmod_ops, &skbmod_net_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) static void __exit skbmod_cleanup_module(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	tcf_unregister_action(&act_skbmod_ops, &skbmod_net_ops);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) module_init(skbmod_init_module);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) module_exit(skbmod_cleanup_module);