forked from Minki/linux
net: tcp: move GRO/GSO functions to tcp_offload
Would be good to make things explicit and move those functions to a new file called tcp_offload.c, thus make this similar to tcpv6_offload.c. While moving all related functions into tcp_offload.c, we can also make some of them static, since they are only used there. Also, add an explicit registration function. Suggested-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann
David S. Miller
parent
5ee9859157
commit
28850dc7c7
@ -1541,15 +1541,14 @@ extern struct request_sock_ops tcp6_request_sock_ops;
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extern void tcp_v4_destroy_sock(struct sock *sk);
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extern int tcp_v4_gso_send_check(struct sk_buff *skb);
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extern struct sk_buff *tcp_tso_segment(struct sk_buff *skb,
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netdev_features_t features);
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extern struct sk_buff **tcp_gro_receive(struct sk_buff **head,
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struct sk_buff *skb);
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extern struct sk_buff **tcp4_gro_receive(struct sk_buff **head,
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struct sk_buff *skb);
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extern int tcp_gro_complete(struct sk_buff *skb);
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extern int tcp4_gro_complete(struct sk_buff *skb);
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extern void __tcp_v4_send_check(struct sk_buff *skb, __be32 saddr,
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__be32 daddr);
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#ifdef CONFIG_PROC_FS
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extern int tcp4_proc_init(void);
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@ -1584,6 +1583,8 @@ struct tcp_request_sock_ops {
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#endif
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};
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extern int tcpv4_offload_init(void);
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extern void tcp_v4_init(void);
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extern void tcp_init(void);
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@ -8,7 +8,7 @@ obj-y := route.o inetpeer.o protocol.o \
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inet_timewait_sock.o inet_connection_sock.o \
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tcp.o tcp_input.o tcp_output.o tcp_timer.o tcp_ipv4.o \
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tcp_minisocks.o tcp_cong.o tcp_metrics.o tcp_fastopen.o \
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datagram.o raw.o udp.o udplite.o \
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tcp_offload.o datagram.o raw.o udp.o udplite.o \
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arp.o icmp.o devinet.o af_inet.o igmp.o \
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fib_frontend.o fib_semantics.o fib_trie.o \
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inet_fragment.o ping.o
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@ -1559,15 +1559,6 @@ static const struct net_protocol tcp_protocol = {
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.netns_ok = 1,
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};
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static const struct net_offload tcp_offload = {
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.callbacks = {
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.gso_send_check = tcp_v4_gso_send_check,
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.gso_segment = tcp_tso_segment,
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.gro_receive = tcp4_gro_receive,
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.gro_complete = tcp4_gro_complete,
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},
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};
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static const struct net_protocol udp_protocol = {
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.handler = udp_rcv,
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.err_handler = udp_err,
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@ -1683,8 +1674,8 @@ static int __init ipv4_offload_init(void)
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*/
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if (inet_add_offload(&udp_offload, IPPROTO_UDP) < 0)
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pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
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if (inet_add_offload(&tcp_offload, IPPROTO_TCP) < 0)
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pr_crit("%s: Cannot add TCP protocol offlaod\n", __func__);
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if (tcpv4_offload_init() < 0)
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pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
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dev_add_offload(&ip_packet_offload);
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return 0;
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241
net/ipv4/tcp.c
241
net/ipv4/tcp.c
@ -2877,247 +2877,6 @@ int compat_tcp_getsockopt(struct sock *sk, int level, int optname,
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EXPORT_SYMBOL(compat_tcp_getsockopt);
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#endif
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struct sk_buff *tcp_tso_segment(struct sk_buff *skb,
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netdev_features_t features)
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{
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struct sk_buff *segs = ERR_PTR(-EINVAL);
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struct tcphdr *th;
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unsigned int thlen;
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unsigned int seq;
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__be32 delta;
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unsigned int oldlen;
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unsigned int mss;
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struct sk_buff *gso_skb = skb;
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__sum16 newcheck;
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bool ooo_okay, copy_destructor;
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if (!pskb_may_pull(skb, sizeof(*th)))
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goto out;
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th = tcp_hdr(skb);
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thlen = th->doff * 4;
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if (thlen < sizeof(*th))
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goto out;
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if (!pskb_may_pull(skb, thlen))
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goto out;
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oldlen = (u16)~skb->len;
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__skb_pull(skb, thlen);
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mss = tcp_skb_mss(skb);
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if (unlikely(skb->len <= mss))
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goto out;
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if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
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/* Packet is from an untrusted source, reset gso_segs. */
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int type = skb_shinfo(skb)->gso_type;
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if (unlikely(type &
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~(SKB_GSO_TCPV4 |
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SKB_GSO_DODGY |
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SKB_GSO_TCP_ECN |
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SKB_GSO_TCPV6 |
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SKB_GSO_GRE |
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SKB_GSO_MPLS |
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SKB_GSO_UDP_TUNNEL |
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0) ||
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!(type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))))
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goto out;
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skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
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segs = NULL;
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goto out;
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}
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copy_destructor = gso_skb->destructor == tcp_wfree;
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ooo_okay = gso_skb->ooo_okay;
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/* All segments but the first should have ooo_okay cleared */
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skb->ooo_okay = 0;
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segs = skb_segment(skb, features);
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if (IS_ERR(segs))
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goto out;
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/* Only first segment might have ooo_okay set */
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segs->ooo_okay = ooo_okay;
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delta = htonl(oldlen + (thlen + mss));
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skb = segs;
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th = tcp_hdr(skb);
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seq = ntohl(th->seq);
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newcheck = ~csum_fold((__force __wsum)((__force u32)th->check +
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(__force u32)delta));
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do {
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th->fin = th->psh = 0;
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th->check = newcheck;
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if (skb->ip_summed != CHECKSUM_PARTIAL)
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th->check =
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csum_fold(csum_partial(skb_transport_header(skb),
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thlen, skb->csum));
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seq += mss;
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if (copy_destructor) {
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skb->destructor = gso_skb->destructor;
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skb->sk = gso_skb->sk;
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/* {tcp|sock}_wfree() use exact truesize accounting :
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* sum(skb->truesize) MUST be exactly be gso_skb->truesize
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* So we account mss bytes of 'true size' for each segment.
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* The last segment will contain the remaining.
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*/
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skb->truesize = mss;
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gso_skb->truesize -= mss;
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}
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skb = skb->next;
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th = tcp_hdr(skb);
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th->seq = htonl(seq);
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th->cwr = 0;
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} while (skb->next);
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/* Following permits TCP Small Queues to work well with GSO :
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* The callback to TCP stack will be called at the time last frag
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* is freed at TX completion, and not right now when gso_skb
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* is freed by GSO engine
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*/
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if (copy_destructor) {
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swap(gso_skb->sk, skb->sk);
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swap(gso_skb->destructor, skb->destructor);
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swap(gso_skb->truesize, skb->truesize);
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}
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delta = htonl(oldlen + (skb_tail_pointer(skb) -
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skb_transport_header(skb)) +
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skb->data_len);
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th->check = ~csum_fold((__force __wsum)((__force u32)th->check +
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(__force u32)delta));
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if (skb->ip_summed != CHECKSUM_PARTIAL)
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th->check = csum_fold(csum_partial(skb_transport_header(skb),
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thlen, skb->csum));
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out:
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return segs;
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}
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EXPORT_SYMBOL(tcp_tso_segment);
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struct sk_buff **tcp_gro_receive(struct sk_buff **head, struct sk_buff *skb)
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{
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struct sk_buff **pp = NULL;
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struct sk_buff *p;
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struct tcphdr *th;
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struct tcphdr *th2;
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unsigned int len;
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unsigned int thlen;
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__be32 flags;
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unsigned int mss = 1;
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unsigned int hlen;
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unsigned int off;
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int flush = 1;
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int i;
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off = skb_gro_offset(skb);
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hlen = off + sizeof(*th);
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th = skb_gro_header_fast(skb, off);
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if (skb_gro_header_hard(skb, hlen)) {
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th = skb_gro_header_slow(skb, hlen, off);
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if (unlikely(!th))
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goto out;
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}
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thlen = th->doff * 4;
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if (thlen < sizeof(*th))
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goto out;
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hlen = off + thlen;
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if (skb_gro_header_hard(skb, hlen)) {
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th = skb_gro_header_slow(skb, hlen, off);
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if (unlikely(!th))
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goto out;
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}
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skb_gro_pull(skb, thlen);
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len = skb_gro_len(skb);
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flags = tcp_flag_word(th);
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for (; (p = *head); head = &p->next) {
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if (!NAPI_GRO_CB(p)->same_flow)
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continue;
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th2 = tcp_hdr(p);
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if (*(u32 *)&th->source ^ *(u32 *)&th2->source) {
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NAPI_GRO_CB(p)->same_flow = 0;
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continue;
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}
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goto found;
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}
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goto out_check_final;
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found:
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flush = NAPI_GRO_CB(p)->flush;
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flush |= (__force int)(flags & TCP_FLAG_CWR);
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flush |= (__force int)((flags ^ tcp_flag_word(th2)) &
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~(TCP_FLAG_CWR | TCP_FLAG_FIN | TCP_FLAG_PSH));
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flush |= (__force int)(th->ack_seq ^ th2->ack_seq);
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for (i = sizeof(*th); i < thlen; i += 4)
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flush |= *(u32 *)((u8 *)th + i) ^
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*(u32 *)((u8 *)th2 + i);
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mss = tcp_skb_mss(p);
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flush |= (len - 1) >= mss;
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flush |= (ntohl(th2->seq) + skb_gro_len(p)) ^ ntohl(th->seq);
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if (flush || skb_gro_receive(head, skb)) {
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mss = 1;
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goto out_check_final;
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}
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p = *head;
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th2 = tcp_hdr(p);
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tcp_flag_word(th2) |= flags & (TCP_FLAG_FIN | TCP_FLAG_PSH);
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out_check_final:
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flush = len < mss;
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flush |= (__force int)(flags & (TCP_FLAG_URG | TCP_FLAG_PSH |
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TCP_FLAG_RST | TCP_FLAG_SYN |
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TCP_FLAG_FIN));
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if (p && (!NAPI_GRO_CB(skb)->same_flow || flush))
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pp = head;
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out:
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NAPI_GRO_CB(skb)->flush |= flush;
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return pp;
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}
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EXPORT_SYMBOL(tcp_gro_receive);
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int tcp_gro_complete(struct sk_buff *skb)
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{
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struct tcphdr *th = tcp_hdr(skb);
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skb->csum_start = skb_transport_header(skb) - skb->head;
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skb->csum_offset = offsetof(struct tcphdr, check);
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skb->ip_summed = CHECKSUM_PARTIAL;
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skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
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if (th->cwr)
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skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
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return 0;
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}
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EXPORT_SYMBOL(tcp_gro_complete);
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#ifdef CONFIG_TCP_MD5SIG
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static struct tcp_md5sig_pool __percpu *tcp_md5sig_pool __read_mostly;
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static DEFINE_MUTEX(tcp_md5sig_mutex);
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@ -545,8 +545,7 @@ out:
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sock_put(sk);
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}
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static void __tcp_v4_send_check(struct sk_buff *skb,
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__be32 saddr, __be32 daddr)
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void __tcp_v4_send_check(struct sk_buff *skb, __be32 saddr, __be32 daddr)
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{
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struct tcphdr *th = tcp_hdr(skb);
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@ -571,23 +570,6 @@ void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb)
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}
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EXPORT_SYMBOL(tcp_v4_send_check);
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int tcp_v4_gso_send_check(struct sk_buff *skb)
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{
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const struct iphdr *iph;
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struct tcphdr *th;
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if (!pskb_may_pull(skb, sizeof(*th)))
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return -EINVAL;
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iph = ip_hdr(skb);
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th = tcp_hdr(skb);
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th->check = 0;
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skb->ip_summed = CHECKSUM_PARTIAL;
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__tcp_v4_send_check(skb, iph->saddr, iph->daddr);
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return 0;
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}
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/*
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* This routine will send an RST to the other tcp.
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*
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@ -2795,52 +2777,6 @@ void tcp4_proc_exit(void)
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}
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#endif /* CONFIG_PROC_FS */
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struct sk_buff **tcp4_gro_receive(struct sk_buff **head, struct sk_buff *skb)
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{
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const struct iphdr *iph = skb_gro_network_header(skb);
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__wsum wsum;
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__sum16 sum;
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switch (skb->ip_summed) {
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case CHECKSUM_COMPLETE:
|
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if (!tcp_v4_check(skb_gro_len(skb), iph->saddr, iph->daddr,
|
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skb->csum)) {
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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break;
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}
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flush:
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NAPI_GRO_CB(skb)->flush = 1;
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return NULL;
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|
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case CHECKSUM_NONE:
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wsum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
|
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skb_gro_len(skb), IPPROTO_TCP, 0);
|
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sum = csum_fold(skb_checksum(skb,
|
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skb_gro_offset(skb),
|
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skb_gro_len(skb),
|
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wsum));
|
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if (sum)
|
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goto flush;
|
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|
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skb->ip_summed = CHECKSUM_UNNECESSARY;
|
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break;
|
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}
|
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|
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return tcp_gro_receive(head, skb);
|
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}
|
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|
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int tcp4_gro_complete(struct sk_buff *skb)
|
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{
|
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const struct iphdr *iph = ip_hdr(skb);
|
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struct tcphdr *th = tcp_hdr(skb);
|
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|
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th->check = ~tcp_v4_check(skb->len - skb_transport_offset(skb),
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iph->saddr, iph->daddr, 0);
|
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skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
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|
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return tcp_gro_complete(skb);
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}
|
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|
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struct proto tcp_prot = {
|
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.name = "TCP",
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.owner = THIS_MODULE,
|
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|
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332
net/ipv4/tcp_offload.c
Normal file
332
net/ipv4/tcp_offload.c
Normal file
@ -0,0 +1,332 @@
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/*
|
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* IPV4 GSO/GRO offload support
|
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* Linux INET implementation
|
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*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* as published by the Free Software Foundation; either version
|
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* 2 of the License, or (at your option) any later version.
|
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*
|
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* TCPv4 GSO/GRO support
|
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*/
|
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|
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#include <linux/skbuff.h>
|
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#include <net/tcp.h>
|
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#include <net/protocol.h>
|
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|
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struct sk_buff *tcp_tso_segment(struct sk_buff *skb,
|
||||
netdev_features_t features)
|
||||
{
|
||||
struct sk_buff *segs = ERR_PTR(-EINVAL);
|
||||
struct tcphdr *th;
|
||||
unsigned int thlen;
|
||||
unsigned int seq;
|
||||
__be32 delta;
|
||||
unsigned int oldlen;
|
||||
unsigned int mss;
|
||||
struct sk_buff *gso_skb = skb;
|
||||
__sum16 newcheck;
|
||||
bool ooo_okay, copy_destructor;
|
||||
|
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if (!pskb_may_pull(skb, sizeof(*th)))
|
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goto out;
|
||||
|
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th = tcp_hdr(skb);
|
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thlen = th->doff * 4;
|
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if (thlen < sizeof(*th))
|
||||
goto out;
|
||||
|
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if (!pskb_may_pull(skb, thlen))
|
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goto out;
|
||||
|
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oldlen = (u16)~skb->len;
|
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__skb_pull(skb, thlen);
|
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|
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mss = tcp_skb_mss(skb);
|
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if (unlikely(skb->len <= mss))
|
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goto out;
|
||||
|
||||
if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
|
||||
/* Packet is from an untrusted source, reset gso_segs. */
|
||||
int type = skb_shinfo(skb)->gso_type;
|
||||
|
||||
if (unlikely(type &
|
||||
~(SKB_GSO_TCPV4 |
|
||||
SKB_GSO_DODGY |
|
||||
SKB_GSO_TCP_ECN |
|
||||
SKB_GSO_TCPV6 |
|
||||
SKB_GSO_GRE |
|
||||
SKB_GSO_MPLS |
|
||||
SKB_GSO_UDP_TUNNEL |
|
||||
0) ||
|
||||
!(type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6))))
|
||||
goto out;
|
||||
|
||||
skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
|
||||
|
||||
segs = NULL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
copy_destructor = gso_skb->destructor == tcp_wfree;
|
||||
ooo_okay = gso_skb->ooo_okay;
|
||||
/* All segments but the first should have ooo_okay cleared */
|
||||
skb->ooo_okay = 0;
|
||||
|
||||
segs = skb_segment(skb, features);
|
||||
if (IS_ERR(segs))
|
||||
goto out;
|
||||
|
||||
/* Only first segment might have ooo_okay set */
|
||||
segs->ooo_okay = ooo_okay;
|
||||
|
||||
delta = htonl(oldlen + (thlen + mss));
|
||||
|
||||
skb = segs;
|
||||
th = tcp_hdr(skb);
|
||||
seq = ntohl(th->seq);
|
||||
|
||||
newcheck = ~csum_fold((__force __wsum)((__force u32)th->check +
|
||||
(__force u32)delta));
|
||||
|
||||
do {
|
||||
th->fin = th->psh = 0;
|
||||
th->check = newcheck;
|
||||
|
||||
if (skb->ip_summed != CHECKSUM_PARTIAL)
|
||||
th->check =
|
||||
csum_fold(csum_partial(skb_transport_header(skb),
|
||||
thlen, skb->csum));
|
||||
|
||||
seq += mss;
|
||||
if (copy_destructor) {
|
||||
skb->destructor = gso_skb->destructor;
|
||||
skb->sk = gso_skb->sk;
|
||||
/* {tcp|sock}_wfree() use exact truesize accounting :
|
||||
* sum(skb->truesize) MUST be exactly be gso_skb->truesize
|
||||
* So we account mss bytes of 'true size' for each segment.
|
||||
* The last segment will contain the remaining.
|
||||
*/
|
||||
skb->truesize = mss;
|
||||
gso_skb->truesize -= mss;
|
||||
}
|
||||
skb = skb->next;
|
||||
th = tcp_hdr(skb);
|
||||
|
||||
th->seq = htonl(seq);
|
||||
th->cwr = 0;
|
||||
} while (skb->next);
|
||||
|
||||
/* Following permits TCP Small Queues to work well with GSO :
|
||||
* The callback to TCP stack will be called at the time last frag
|
||||
* is freed at TX completion, and not right now when gso_skb
|
||||
* is freed by GSO engine
|
||||
*/
|
||||
if (copy_destructor) {
|
||||
swap(gso_skb->sk, skb->sk);
|
||||
swap(gso_skb->destructor, skb->destructor);
|
||||
swap(gso_skb->truesize, skb->truesize);
|
||||
}
|
||||
|
||||
delta = htonl(oldlen + (skb_tail_pointer(skb) -
|
||||
skb_transport_header(skb)) +
|
||||
skb->data_len);
|
||||
th->check = ~csum_fold((__force __wsum)((__force u32)th->check +
|
||||
(__force u32)delta));
|
||||
if (skb->ip_summed != CHECKSUM_PARTIAL)
|
||||
th->check = csum_fold(csum_partial(skb_transport_header(skb),
|
||||
thlen, skb->csum));
|
||||
out:
|
||||
return segs;
|
||||
}
|
||||
EXPORT_SYMBOL(tcp_tso_segment);
|
||||
|
||||
struct sk_buff **tcp_gro_receive(struct sk_buff **head, struct sk_buff *skb)
|
||||
{
|
||||
struct sk_buff **pp = NULL;
|
||||
struct sk_buff *p;
|
||||
struct tcphdr *th;
|
||||
struct tcphdr *th2;
|
||||
unsigned int len;
|
||||
unsigned int thlen;
|
||||
__be32 flags;
|
||||
unsigned int mss = 1;
|
||||
unsigned int hlen;
|
||||
unsigned int off;
|
||||
int flush = 1;
|
||||
int i;
|
||||
|
||||
off = skb_gro_offset(skb);
|
||||
hlen = off + sizeof(*th);
|
||||
th = skb_gro_header_fast(skb, off);
|
||||
if (skb_gro_header_hard(skb, hlen)) {
|
||||
th = skb_gro_header_slow(skb, hlen, off);
|
||||
if (unlikely(!th))
|
||||
goto out;
|
||||
}
|
||||
|
||||
thlen = th->doff * 4;
|
||||
if (thlen < sizeof(*th))
|
||||
goto out;
|
||||
|
||||
hlen = off + thlen;
|
||||
if (skb_gro_header_hard(skb, hlen)) {
|
||||
th = skb_gro_header_slow(skb, hlen, off);
|
||||
if (unlikely(!th))
|
||||
goto out;
|
||||
}
|
||||
|
||||
skb_gro_pull(skb, thlen);
|
||||
|
||||
len = skb_gro_len(skb);
|
||||
flags = tcp_flag_word(th);
|
||||
|
||||
for (; (p = *head); head = &p->next) {
|
||||
if (!NAPI_GRO_CB(p)->same_flow)
|
||||
continue;
|
||||
|
||||
th2 = tcp_hdr(p);
|
||||
|
||||
if (*(u32 *)&th->source ^ *(u32 *)&th2->source) {
|
||||
NAPI_GRO_CB(p)->same_flow = 0;
|
||||
continue;
|
||||
}
|
||||
|
||||
goto found;
|
||||
}
|
||||
|
||||
goto out_check_final;
|
||||
|
||||
found:
|
||||
flush = NAPI_GRO_CB(p)->flush;
|
||||
flush |= (__force int)(flags & TCP_FLAG_CWR);
|
||||
flush |= (__force int)((flags ^ tcp_flag_word(th2)) &
|
||||
~(TCP_FLAG_CWR | TCP_FLAG_FIN | TCP_FLAG_PSH));
|
||||
flush |= (__force int)(th->ack_seq ^ th2->ack_seq);
|
||||
for (i = sizeof(*th); i < thlen; i += 4)
|
||||
flush |= *(u32 *)((u8 *)th + i) ^
|
||||
*(u32 *)((u8 *)th2 + i);
|
||||
|
||||
mss = tcp_skb_mss(p);
|
||||
|
||||
flush |= (len - 1) >= mss;
|
||||
flush |= (ntohl(th2->seq) + skb_gro_len(p)) ^ ntohl(th->seq);
|
||||
|
||||
if (flush || skb_gro_receive(head, skb)) {
|
||||
mss = 1;
|
||||
goto out_check_final;
|
||||
}
|
||||
|
||||
p = *head;
|
||||
th2 = tcp_hdr(p);
|
||||
tcp_flag_word(th2) |= flags & (TCP_FLAG_FIN | TCP_FLAG_PSH);
|
||||
|
||||
out_check_final:
|
||||
flush = len < mss;
|
||||
flush |= (__force int)(flags & (TCP_FLAG_URG | TCP_FLAG_PSH |
|
||||
TCP_FLAG_RST | TCP_FLAG_SYN |
|
||||
TCP_FLAG_FIN));
|
||||
|
||||
if (p && (!NAPI_GRO_CB(skb)->same_flow || flush))
|
||||
pp = head;
|
||||
|
||||
out:
|
||||
NAPI_GRO_CB(skb)->flush |= flush;
|
||||
|
||||
return pp;
|
||||
}
|
||||
EXPORT_SYMBOL(tcp_gro_receive);
|
||||
|
||||
int tcp_gro_complete(struct sk_buff *skb)
|
||||
{
|
||||
struct tcphdr *th = tcp_hdr(skb);
|
||||
|
||||
skb->csum_start = skb_transport_header(skb) - skb->head;
|
||||
skb->csum_offset = offsetof(struct tcphdr, check);
|
||||
skb->ip_summed = CHECKSUM_PARTIAL;
|
||||
|
||||
skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
|
||||
|
||||
if (th->cwr)
|
||||
skb_shinfo(skb)->gso_type |= SKB_GSO_TCP_ECN;
|
||||
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(tcp_gro_complete);
|
||||
|
||||
static int tcp_v4_gso_send_check(struct sk_buff *skb)
|
||||
{
|
||||
const struct iphdr *iph;
|
||||
struct tcphdr *th;
|
||||
|
||||
if (!pskb_may_pull(skb, sizeof(*th)))
|
||||
return -EINVAL;
|
||||
|
||||
iph = ip_hdr(skb);
|
||||
th = tcp_hdr(skb);
|
||||
|
||||
th->check = 0;
|
||||
skb->ip_summed = CHECKSUM_PARTIAL;
|
||||
__tcp_v4_send_check(skb, iph->saddr, iph->daddr);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct sk_buff **tcp4_gro_receive(struct sk_buff **head, struct sk_buff *skb)
|
||||
{
|
||||
const struct iphdr *iph = skb_gro_network_header(skb);
|
||||
__wsum wsum;
|
||||
__sum16 sum;
|
||||
|
||||
switch (skb->ip_summed) {
|
||||
case CHECKSUM_COMPLETE:
|
||||
if (!tcp_v4_check(skb_gro_len(skb), iph->saddr, iph->daddr,
|
||||
skb->csum)) {
|
||||
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
||||
break;
|
||||
}
|
||||
flush:
|
||||
NAPI_GRO_CB(skb)->flush = 1;
|
||||
return NULL;
|
||||
|
||||
case CHECKSUM_NONE:
|
||||
wsum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
|
||||
skb_gro_len(skb), IPPROTO_TCP, 0);
|
||||
sum = csum_fold(skb_checksum(skb,
|
||||
skb_gro_offset(skb),
|
||||
skb_gro_len(skb),
|
||||
wsum));
|
||||
if (sum)
|
||||
goto flush;
|
||||
|
||||
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
||||
break;
|
||||
}
|
||||
|
||||
return tcp_gro_receive(head, skb);
|
||||
}
|
||||
|
||||
static int tcp4_gro_complete(struct sk_buff *skb)
|
||||
{
|
||||
const struct iphdr *iph = ip_hdr(skb);
|
||||
struct tcphdr *th = tcp_hdr(skb);
|
||||
|
||||
th->check = ~tcp_v4_check(skb->len - skb_transport_offset(skb),
|
||||
iph->saddr, iph->daddr, 0);
|
||||
skb_shinfo(skb)->gso_type = SKB_GSO_TCPV4;
|
||||
|
||||
return tcp_gro_complete(skb);
|
||||
}
|
||||
|
||||
static const struct net_offload tcpv4_offload = {
|
||||
.callbacks = {
|
||||
.gso_send_check = tcp_v4_gso_send_check,
|
||||
.gso_segment = tcp_tso_segment,
|
||||
.gro_receive = tcp4_gro_receive,
|
||||
.gro_complete = tcp4_gro_complete,
|
||||
},
|
||||
};
|
||||
|
||||
int __init tcpv4_offload_init(void)
|
||||
{
|
||||
return inet_add_offload(&tcpv4_offload, IPPROTO_TCP);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user