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Date: Thu, 13 Oct 2016 09:06:44 +0300 From: Shmulik Ladkani <shmulik.ladkani@...il.com> To: David Miller <davem@...emloft.net> Cc: Jamal Hadi Salim <jhs@...atatu.com>, Eric Dumazet <edumazet@...gle.com>, WANG Cong <xiyou.wangcong@...il.com>, Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org, Shmulik Ladkani <shmulik.ladkani@...il.com>, Eric Dumazet <eric.dumazet@...il.com> Subject: [PATCH v4 net-next 4/4] net/sched: act_mirred: Implement ingress actions Up until now, 'action mirred' supported only egress actions (either TCA_EGRESS_REDIR or TCA_EGRESS_MIRROR). This patch implements the corresponding ingress actions TCA_INGRESS_REDIR and TCA_INGRESS_MIRROR. This allows attaching filters whose target is to hand matching skbs into the rx processing of a specified device. Signed-off-by: Shmulik Ladkani <shmulik.ladkani@...il.com> Cc: Jamal Hadi Salim <jhs@...atatu.com> Cc: Eric Dumazet <eric.dumazet@...il.com> Cc: Cong Wang <xiyou.wangcong@...il.com> --- v4: check ret code of netif_receive_skb, as suggested by Cong Wang v3: Addressed non coherency due to reading m->tcfm_eaction multiple times, as spotted by Eric Dumazet net/sched/act_mirred.c | 51 ++++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 45 insertions(+), 6 deletions(-) diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c index 69dcce8..2d93be6 100644 --- a/net/sched/act_mirred.c +++ b/net/sched/act_mirred.c @@ -33,6 +33,25 @@ static LIST_HEAD(mirred_list); static DEFINE_SPINLOCK(mirred_list_lock); +static bool tcf_mirred_is_act_redirect(int action) +{ + return action == TCA_EGRESS_REDIR || action == TCA_INGRESS_REDIR; +} + +static u32 tcf_mirred_act_direction(int action) +{ + switch (action) { + case TCA_EGRESS_REDIR: + case TCA_EGRESS_MIRROR: + return AT_EGRESS; + case TCA_INGRESS_REDIR: + case TCA_INGRESS_MIRROR: + return AT_INGRESS; + default: + BUG(); + } +} + static void tcf_mirred_release(struct tc_action *a, int bind) { struct tcf_mirred *m = to_mirred(a); @@ -97,6 +116,8 @@ static int tcf_mirred_init(struct net *net, struct nlattr *nla, switch (parm->eaction) { case TCA_EGRESS_MIRROR: case TCA_EGRESS_REDIR: + case TCA_INGRESS_REDIR: + case TCA_INGRESS_MIRROR: break; default: if (exists) @@ -156,15 +177,20 @@ static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a, struct tcf_result *res) { struct tcf_mirred *m = to_mirred(a); + bool m_mac_header_xmit; struct net_device *dev; struct sk_buff *skb2; - int retval, err; + int retval, err = 0; + int m_eaction; + int mac_len; u32 at; tcf_lastuse_update(&m->tcf_tm); bstats_cpu_update(this_cpu_ptr(m->common.cpu_bstats), skb); rcu_read_lock(); + m_mac_header_xmit = READ_ONCE(m->tcfm_mac_header_xmit); + m_eaction = READ_ONCE(m->tcfm_eaction); retval = READ_ONCE(m->tcf_action); dev = rcu_dereference(m->tcfm_dev); if (unlikely(!dev)) { @@ -183,23 +209,36 @@ static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a, if (!skb2) goto out; - if (!(at & AT_EGRESS)) { - if (m->tcfm_mac_header_xmit) + /* If action's target direction differs than filter's direction, + * and devices expect a mac header on xmit, then mac push/pull is + * needed. + */ + if (at != tcf_mirred_act_direction(m_eaction) && m_mac_header_xmit) { + if (at & AT_EGRESS) { + /* caught at egress, act ingress: pull mac */ + mac_len = skb_network_header(skb) - skb_mac_header(skb); + skb_pull_rcsum(skb2, mac_len); + } else { + /* caught at ingress, act egress: push mac */ skb_push_rcsum(skb2, skb->mac_len); + } } /* mirror is always swallowed */ - if (m->tcfm_eaction != TCA_EGRESS_MIRROR) + if (tcf_mirred_is_act_redirect(m_eaction)) skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at); skb2->skb_iif = skb->dev->ifindex; skb2->dev = dev; - err = dev_queue_xmit(skb2); + if (tcf_mirred_act_direction(m_eaction) & AT_EGRESS) + err = dev_queue_xmit(skb2); + else + err = netif_receive_skb(skb2); if (err) { out: qstats_overlimit_inc(this_cpu_ptr(m->common.cpu_qstats)); - if (m->tcfm_eaction != TCA_EGRESS_MIRROR) + if (tcf_mirred_is_act_redirect(m_eaction)) retval = TC_ACT_SHOT; } rcu_read_unlock(); -- 1.9.1
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