static int tcf_skbedit_act(struct sk_buff *skb, const struct tc_action *a, struct tcf_result *res) { struct tcf_skbedit *d = to_skbedit(a); struct tcf_skbedit_params *params; int action; tcf_lastuse_update(&d->tcf_tm); bstats_cpu_update(this_cpu_ptr(d->common.cpu_bstats), skb); params = rcu_dereference_bh(d->params); action = READ_ONCE(d->tcf_action); if (params->flags & SKBEDIT_F_PRIORITY) skb->priority = params->priority; if (params->flags & SKBEDIT_F_INHERITDSFIELD) { int wlen = skb_network_offset(skb); switch (tc_skb_protocol(skb)) { case htons(ETH_P_IP): wlen += sizeof(struct iphdr); if (!pskb_may_pull(skb, wlen)) goto err; skb->priority = ipv4_get_dsfield(ip_hdr(skb)) >> 2; break; case htons(ETH_P_IPV6): wlen += sizeof(struct ipv6hdr); if (!pskb_may_pull(skb, wlen)) goto err; skb->priority = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2; break; } }
static int em_ipset_match(struct sk_buff *skb, struct tcf_ematch *em, struct tcf_pkt_info *info) { struct ip_set_adt_opt opt; struct xt_action_param acpar; const struct xt_set_info *set = (const void *) em->data; struct net_device *dev, *indev = NULL; int ret, network_offset; switch (tc_skb_protocol(skb)) { case htons(ETH_P_IP): acpar.family = NFPROTO_IPV4; if (!pskb_network_may_pull(skb, sizeof(struct iphdr))) return 0; acpar.thoff = ip_hdrlen(skb); break; case htons(ETH_P_IPV6): acpar.family = NFPROTO_IPV6; if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr))) return 0; /* doesn't call ipv6_find_hdr() because ipset doesn't use thoff, yet */ acpar.thoff = sizeof(struct ipv6hdr); break; default: return 0; } acpar.hooknum = 0; opt.family = acpar.family; opt.dim = set->dim; opt.flags = set->flags; opt.cmdflags = 0; opt.ext.timeout = ~0u; network_offset = skb_network_offset(skb); skb_pull(skb, network_offset); dev = skb->dev; rcu_read_lock(); if (skb->skb_iif) indev = dev_get_by_index_rcu(em->net, skb->skb_iif); acpar.in = indev ? indev : dev; acpar.out = dev; ret = ip_set_test(set->index, skb, &acpar, &opt); rcu_read_unlock(); skb_push(skb, network_offset); return ret; }
static int tcf_csum(struct sk_buff *skb, const struct tc_action *a, struct tcf_result *res) { struct tcf_csum *p = a->priv; int action; u32 update_flags; spin_lock(&p->tcf_lock); p->tcf_tm.lastuse = jiffies; bstats_update(&p->tcf_bstats, skb); action = p->tcf_action; update_flags = p->update_flags; spin_unlock(&p->tcf_lock); if (unlikely(action == TC_ACT_SHOT)) goto drop; switch (tc_skb_protocol(skb)) { case cpu_to_be16(ETH_P_IP): if (!tcf_csum_ipv4(skb, update_flags)) goto drop; break; case cpu_to_be16(ETH_P_IPV6): if (!tcf_csum_ipv6(skb, update_flags)) goto drop; break; } return action; drop: spin_lock(&p->tcf_lock); p->tcf_qstats.drops++; spin_unlock(&p->tcf_lock); return TC_ACT_SHOT; }