X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=net%2Fnetfilter%2Fnfnetlink_queue_core.c;h=e8c9f3bb779cd6c108409911f348f73f5a1689f7;hb=bd0779370588386e4a67ba5d0b176cfded8e6a53;hp=5352b2d2d5bf644cffd04ed5a571924f623f65d5;hpb=21796b39c9e876a46a353a4a9ff9881766a7c176;p=~andy%2Flinux diff --git a/net/netfilter/nfnetlink_queue_core.c b/net/netfilter/nfnetlink_queue_core.c index 5352b2d2d5b..e8c9f3bb779 100644 --- a/net/netfilter/nfnetlink_queue_core.c +++ b/net/netfilter/nfnetlink_queue_core.c @@ -41,6 +41,14 @@ #define NFQNL_QMAX_DEFAULT 1024 +/* We're using struct nlattr which has 16bit nla_len. Note that nla_len + * includes the header length. Thus, the maximum packet length that we + * support is 65531 bytes. We send truncated packets if the specified length + * is larger than that. Userspace can check for presence of NFQA_CAP_LEN + * attribute to detect truncation. + */ +#define NFQNL_MAX_COPY_RANGE (0xffff - NLA_HDRLEN) + struct nfqnl_instance { struct hlist_node hlist; /* global list of queues */ struct rcu_head rcu; @@ -122,7 +130,7 @@ instance_create(struct nfnl_queue_net *q, u_int16_t queue_num, inst->queue_num = queue_num; inst->peer_portid = portid; inst->queue_maxlen = NFQNL_QMAX_DEFAULT; - inst->copy_range = 0xffff; + inst->copy_range = NFQNL_MAX_COPY_RANGE; inst->copy_mode = NFQNL_COPY_NONE; spin_lock_init(&inst->lock); INIT_LIST_HEAD(&inst->queue_list); @@ -272,12 +280,17 @@ nfqnl_zcopy(struct sk_buff *to, const struct sk_buff *from, int len, int hlen) skb_shinfo(to)->nr_frags = j; } -static int nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet) +static int +nfqnl_put_packet_info(struct sk_buff *nlskb, struct sk_buff *packet, + bool csum_verify) { __u32 flags = 0; if (packet->ip_summed == CHECKSUM_PARTIAL) flags = NFQA_SKB_CSUMNOTREADY; + else if (csum_verify) + flags = NFQA_SKB_CSUM_NOTVERIFIED; + if (skb_is_gso(packet)) flags |= NFQA_SKB_GSO; @@ -302,6 +315,7 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue, struct net_device *outdev; struct nf_conn *ct = NULL; enum ip_conntrack_info uninitialized_var(ctinfo); + bool csum_verify; size = nlmsg_total_size(sizeof(struct nfgenmsg)) + nla_total_size(sizeof(struct nfqnl_msg_packet_hdr)) @@ -319,6 +333,12 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue, if (entskb->tstamp.tv64) size += nla_total_size(sizeof(struct nfqnl_msg_packet_timestamp)); + if (entry->hook <= NF_INET_FORWARD || + (entry->hook == NF_INET_POST_ROUTING && entskb->sk == NULL)) + csum_verify = !skb_csum_unnecessary(entskb); + else + csum_verify = false; + outdev = entry->outdev; switch ((enum nfqnl_config_mode)ACCESS_ONCE(queue->copy_mode)) { @@ -333,10 +353,9 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue, return NULL; data_len = ACCESS_ONCE(queue->copy_range); - if (data_len == 0 || data_len > entskb->len) + if (data_len > entskb->len) data_len = entskb->len; - if (!entskb->head_frag || skb_headlen(entskb) < L1_CACHE_BYTES || skb_shinfo(entskb)->nr_frags >= MAX_SKB_FRAGS) @@ -465,10 +484,11 @@ nfqnl_build_packet_message(struct nfqnl_instance *queue, if (ct && nfqnl_ct_put(skb, ct, ctinfo) < 0) goto nla_put_failure; - if (cap_len > 0 && nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) + if (cap_len > data_len && + nla_put_be32(skb, NFQA_CAP_LEN, htonl(cap_len))) goto nla_put_failure; - if (nfqnl_put_packet_info(skb, entskb)) + if (nfqnl_put_packet_info(skb, entskb, csum_verify)) goto nla_put_failure; if (data_len) { @@ -509,10 +529,6 @@ __nfqnl_enqueue_packet(struct net *net, struct nfqnl_instance *queue, } spin_lock_bh(&queue->lock); - if (!queue->peer_portid) { - err = -EINVAL; - goto err_out_free_nskb; - } if (queue->queue_total >= queue->queue_maxlen) { if (queue->flags & NFQA_CFG_F_FAIL_OPEN) { failopen = 1; @@ -731,13 +747,8 @@ nfqnl_set_mode(struct nfqnl_instance *queue, case NFQNL_COPY_PACKET: queue->copy_mode = mode; - /* We're using struct nlattr which has 16bit nla_len. Note that - * nla_len includes the header length. Thus, the maximum packet - * length that we support is 65531 bytes. We send truncated - * packets if the specified length is larger than that. - */ - if (range > 0xffff - NLA_HDRLEN) - queue->copy_range = 0xffff - NLA_HDRLEN; + if (range == 0 || range > NFQNL_MAX_COPY_RANGE) + queue->copy_range = NFQNL_MAX_COPY_RANGE; else queue->copy_range = range; break; @@ -800,7 +811,7 @@ static int nfqnl_rcv_dev_event(struct notifier_block *this, unsigned long event, void *ptr) { - struct net_device *dev = ptr; + struct net_device *dev = netdev_notifier_info_to_dev(ptr); /* Drop any packets associated with the downed device */ if (event == NETDEV_DOWN) @@ -848,6 +859,7 @@ static const struct nla_policy nfqa_verdict_policy[NFQA_MAX+1] = { [NFQA_MARK] = { .type = NLA_U32 }, [NFQA_PAYLOAD] = { .type = NLA_UNSPEC }, [NFQA_CT] = { .type = NLA_UNSPEC }, + [NFQA_EXP] = { .type = NLA_UNSPEC }, }; static const struct nla_policy nfqa_verdict_batch_policy[NFQA_MAX+1] = { @@ -976,9 +988,14 @@ nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, if (entry == NULL) return -ENOENT; - rcu_read_lock(); - if (nfqa[NFQA_CT] && (queue->flags & NFQA_CFG_F_CONNTRACK)) + if (nfqa[NFQA_CT]) { ct = nfqnl_ct_parse(entry->skb, nfqa[NFQA_CT], &ctinfo); + if (ct && nfqa[NFQA_EXP]) { + nfqnl_attach_expect(ct, nfqa[NFQA_EXP], + NETLINK_CB(skb).portid, + nlmsg_report(nlh)); + } + } if (nfqa[NFQA_PAYLOAD]) { u16 payload_len = nla_len(nfqa[NFQA_PAYLOAD]); @@ -991,7 +1008,6 @@ nfqnl_recv_verdict(struct sock *ctnl, struct sk_buff *skb, if (ct) nfqnl_ct_seq_adjust(skb, ct, ctinfo, diff); } - rcu_read_unlock(); if (nfqa[NFQA_MARK]) entry->skb->mark = ntohl(nla_get_be32(nfqa[NFQA_MARK]));