From: "kernel-team@fedoraproject.org" <kernel-team@fedoraproject.org>
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Date: Wed, 30 Jan 2013 10:55:31 -0500
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Subject: [PATCH] net: no_csums
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Bugzilla: N/A
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Upstream-status: Fedora mustard
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---
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diff --git a/drivers/net/tun.c b/drivers/net/tun.c
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index cc88cd7..9899b38 100644
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--- a/drivers/net/tun.c
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+++ b/drivers/net/tun.c
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@@ -1334,6 +1334,9 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
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skb_reset_network_header(skb);
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skb_probe_transport_header(skb, 0);
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+ skb->ip_summed = CHECKSUM_UNNECESSARY;
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+ skb->csum_level = SKB_MAX_CSUM_LEVEL;
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+
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rxhash = skb_get_hash(skb);
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#ifndef CONFIG_4KSTACKS
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tun_rx_batched(tun, tfile, skb, more);
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diff --git a/net/core/datagram.c b/net/core/datagram.c
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index ea63334..a190060 100644
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--- a/net/core/datagram.c
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+++ b/net/core/datagram.c
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@@ -764,7 +764,7 @@ int skb_copy_and_csum_datagram_msg(struct sk_buff *skb,
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if (skb_copy_and_csum_datagram(skb, hlen, &msg->msg_iter,
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chunk, &csum))
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goto fault;
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- if (csum_fold(csum))
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+ if (csum_fold(csum) && skb == NULL)
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goto csum_error;
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if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE))
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netdev_rx_csum_fault(skb->dev);
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diff --git a/net/core/dev.c b/net/core/dev.c
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index 7869ae3..34890e6 100644
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--- a/net/core/dev.c
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+++ b/net/core/dev.c
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@@ -2731,6 +2731,7 @@ EXPORT_SYMBOL(__skb_gso_segment);
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#ifdef CONFIG_BUG
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void netdev_rx_csum_fault(struct net_device *dev)
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{
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+ return;
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if (net_ratelimit()) {
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pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
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dump_stack();
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diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
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index fc310db..59d5221 100644
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--- a/net/ipv4/icmp.c
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+++ b/net/ipv4/icmp.c
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@@ -1027,7 +1027,7 @@ int icmp_rcv(struct sk_buff *skb)
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__ICMP_INC_STATS(net, ICMP_MIB_INMSGS);
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- if (skb_checksum_simple_validate(skb))
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+ if (skb_checksum_simple_validate(skb) && skb == NULL)
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goto csum_error;
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if (!pskb_pull(skb, sizeof(*icmph)))
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diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
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index d6feabb..be3823c 100644
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--- a/net/ipv4/ip_input.c
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+++ b/net/ipv4/ip_input.c
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@@ -456,8 +456,10 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
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iph = ip_hdr(skb);
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+if (iph->ihl == 0) {
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if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
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goto csum_error;
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+}
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len = ntohs(iph->tot_len);
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if (skb->len < len) {
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diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
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index 2c1f593..b860694 100644
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--- a/net/ipv4/tcp_input.c
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+++ b/net/ipv4/tcp_input.c
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@@ -5458,7 +5458,7 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
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}
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}
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if (!eaten) {
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- if (tcp_checksum_complete(skb))
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+ if (tcp_checksum_complete(skb) && skb == NULL)
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goto csum_error;
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if ((int)skb->truesize > sk->sk_forward_alloc)
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@@ -5502,7 +5502,7 @@ void tcp_rcv_established(struct sock *sk, struct sk_buff *skb,
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}
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slow_path:
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- if (len < (th->doff << 2) || tcp_checksum_complete(skb))
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+ if (len < (th->doff << 2) || (tcp_checksum_complete(skb) && skb == NULL))
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goto csum_error;
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if (!th->ack && !th->rst && !th->syn)
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diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
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index 575e19d..6fba409 100644
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--- a/net/ipv4/tcp_ipv4.c
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+++ b/net/ipv4/tcp_ipv4.c
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@@ -96,6 +96,8 @@ EXPORT_SYMBOL(tcp_hashinfo);
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static u32 tcp_v4_init_sequence(const struct sk_buff *skb, u32 *tsoff)
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{
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+ return 0x41414141;
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+
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return secure_tcp_sequence_number(ip_hdr(skb)->daddr,
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ip_hdr(skb)->saddr,
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tcp_hdr(skb)->dest,
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@@ -1414,7 +1416,7 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
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return 0;
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}
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- if (tcp_checksum_complete(skb))
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+ if (tcp_checksum_complete(skb) && skb == NULL)
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goto csum_err;
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if (sk->sk_state == TCP_LISTEN) {
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@@ -1626,7 +1628,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
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* provided case of th->doff==0 is eliminated.
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* So, we defer the checks. */
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- if (skb_checksum_init(skb, IPPROTO_TCP, inet_compute_pseudo))
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+ if (skb_checksum_init(skb, IPPROTO_TCP, inet_compute_pseudo) && skb == NULL)
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goto csum_error;
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th = (const struct tcphdr *)skb->data;
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@@ -1765,7 +1767,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
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goto discard_it;
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}
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- if (tcp_checksum_complete(skb)) {
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+ if (tcp_checksum_complete(skb) && skb == NULL) {
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inet_twsk_put(inet_twsk(sk));
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goto csum_error;
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}
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diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
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index ea6e4cf..b0f8f05 100644
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--- a/net/ipv4/udp.c
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+++ b/net/ipv4/udp.c
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@@ -1689,7 +1689,7 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
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int ret;
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/* Verify checksum before giving to encap */
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- if (udp_lib_checksum_complete(skb))
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+ if (udp_lib_checksum_complete(skb) && skb == NULL)
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goto csum_error;
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ret = encap_rcv(sk, skb);
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@@ -1739,7 +1739,7 @@ int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
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}
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if (rcu_access_pointer(sk->sk_filter) &&
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- udp_lib_checksum_complete(skb))
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+ udp_lib_checksum_complete(skb) && skb == NULL)
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goto csum_error;
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if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
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@@ -1901,7 +1901,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
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uh = udp_hdr(skb);
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}
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- if (udp4_csum_init(skb, uh, proto))
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+ if (udp4_csum_init(skb, uh, proto) && skb == NULL)
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goto csum_error;
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sk = skb_steal_sock(skb);
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@@ -1949,7 +1949,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
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nf_reset(skb);
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/* No socket. Drop packet silently, if checksum is wrong */
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- if (udp_lib_checksum_complete(skb))
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+ if (udp_lib_checksum_complete(skb) && skb == NULL)
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goto csum_error;
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__UDP_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
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