Merge to Fedora kernel-2.6.17-1.2187_FC5 patched with stable patch-2.6.17.13-vs2...

[linux-2.6.git] / net / ipv4 / tcp.c

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 6a22831..e369c0b 100644 (file)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -258,6 +258,7 @@
 #include <linux/random.h>
 #include <linux/bootmem.h>
 #include <linux/cache.h>
+#include <linux/err.h>
 #include <linux/in.h>
 
 #include <net/icmp.h>
@@ -572,7 +573,7 @@ new_segment:
                skb->ip_summed = CHECKSUM_HW;
                tp->write_seq += copy;
                TCP_SKB_CB(skb)->end_seq += copy;
-               skb_shinfo(skb)->tso_segs = 0;
+               skb_shinfo(skb)->gso_segs = 0;
 
                if (!copied)
                        TCP_SKB_CB(skb)->flags &= ~TCPCB_FLAG_PSH;
@@ -623,14 +624,10 @@ ssize_t tcp_sendpage(struct socket *sock, struct page *page, int offset,
        ssize_t res;
        struct sock *sk = sock->sk;
 
-#define TCP_ZC_CSUM_FLAGS (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM | NETIF_F_HW_CSUM)
-
        if (!(sk->sk_route_caps & NETIF_F_SG) ||
-           !(sk->sk_route_caps & TCP_ZC_CSUM_FLAGS))
+           !(sk->sk_route_caps & NETIF_F_ALL_CSUM))
                return sock_no_sendpage(sock, page, offset, size, flags);
 
-#undef TCP_ZC_CSUM_FLAGS
-
        lock_sock(sk);
        TCP_CHECK_TIMER(sk);
        res = do_tcp_sendpages(sk, &page, offset, size, flags);
@@ -727,9 +724,7 @@ new_segment:
                                /*
                                 * Check whether we can use HW checksum.
                                 */
-                               if (sk->sk_route_caps &
-                                   (NETIF_F_IP_CSUM | NETIF_F_NO_CSUM |
-                                    NETIF_F_HW_CSUM))
+                               if (sk->sk_route_caps & NETIF_F_ALL_CSUM)
                                        skb->ip_summed = CHECKSUM_HW;
 
                                skb_entail(sk, tp, skb);
@@ -825,7 +820,7 @@ new_segment:
 
                        tp->write_seq += copy;
                        TCP_SKB_CB(skb)->end_seq += copy;
-                       skb_shinfo(skb)->tso_segs = 0;
+                       skb_shinfo(skb)->gso_segs = 0;
 
                        from += copy;
                        copied += copy;
@@ -2072,6 +2067,77 @@ int compat_tcp_getsockopt(struct sock *sk, int level, int optname,
 EXPORT_SYMBOL(compat_tcp_getsockopt);
 #endif
 
+struct sk_buff *tcp_tso_segment(struct sk_buff *skb, int features)
+{
+       struct sk_buff *segs = ERR_PTR(-EINVAL);
+       struct tcphdr *th;
+       unsigned thlen;
+       unsigned int seq;
+       unsigned int delta;
+       unsigned int oldlen;
+       unsigned int len;
+
+       if (!pskb_may_pull(skb, sizeof(*th)))
+               goto out;
+
+       th = skb->h.th;
+       thlen = th->doff * 4;
+       if (thlen < sizeof(*th))
+               goto out;
+
+       if (!pskb_may_pull(skb, thlen))
+               goto out;
+
+       oldlen = (u16)~skb->len;
+       __skb_pull(skb, thlen);
+
+       if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
+               /* Packet is from an untrusted source, reset gso_segs. */
+               int mss = skb_shinfo(skb)->gso_size;
+
+               skb_shinfo(skb)->gso_segs = (skb->len + mss - 1) / mss;
+
+               segs = NULL;
+               goto out;
+       }
+
+       segs = skb_segment(skb, features);
+       if (IS_ERR(segs))
+               goto out;
+
+       len = skb_shinfo(skb)->gso_size;
+       delta = htonl(oldlen + (thlen + len));
+
+       skb = segs;
+       th = skb->h.th;
+       seq = ntohl(th->seq);
+
+       do {
+               th->fin = th->psh = 0;
+
+               th->check = ~csum_fold(th->check + delta);
+               if (skb->ip_summed != CHECKSUM_HW)
+                       th->check = csum_fold(csum_partial(skb->h.raw, thlen,
+                                                          skb->csum));
+
+               seq += len;
+               skb = skb->next;
+               th = skb->h.th;
+
+               th->seq = htonl(seq);
+               th->cwr = 0;
+       } while (skb->next);
+
+       delta = htonl(oldlen + (skb->tail - skb->h.raw) + skb->data_len);
+       th->check = ~csum_fold(th->check + delta);
+       if (skb->ip_summed != CHECKSUM_HW)
+               th->check = csum_fold(csum_partial(skb->h.raw, thlen,
+                                                  skb->csum));
+
+out:
+       return segs;
+}
+
 extern void __skb_cb_too_small_for_tcp(int, int);
 extern struct tcp_congestion_ops tcp_reno;