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Diffstat (limited to 'net/ipv6/ip6_output.c')
-rw-r--r--net/ipv6/ip6_output.c91
1 files changed, 65 insertions, 26 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index b7ca46161cb..17b8c67998b 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -210,7 +210,7 @@ int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
kfree_skb(skb);
return -ENOBUFS;
}
- kfree_skb(skb);
+ consume_skb(skb);
skb = skb2;
skb_set_owner_w(skb, sk);
}
@@ -252,8 +252,7 @@ int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
dst->dev, dst_output);
}
- if (net_ratelimit())
- printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n");
+ net_dbg_ratelimited("IPv6: sending pkt_too_big to self\n");
skb->dev = dst->dev;
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)), IPSTATS_MIB_FRAGFAILS);
@@ -644,7 +643,10 @@ int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
/* We must not fragment if the socket is set to force MTU discovery
* or if the skb it not generated by a local socket.
*/
- if (!skb->local_df && skb->len > mtu) {
+ if (unlikely(!skb->local_df && skb->len > mtu)) {
+ if (skb->sk && dst_allfrag(skb_dst(skb)))
+ sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK);
+
skb->dev = skb_dst(skb)->dev;
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
@@ -789,6 +791,10 @@ slow_path_clean:
}
slow_path:
+ if ((skb->ip_summed == CHECKSUM_PARTIAL) &&
+ skb_checksum_help(skb))
+ goto fail;
+
left = skb->len - hlen; /* Space per frame */
ptr = hlen; /* Where to start from */
@@ -889,7 +895,7 @@ slow_path:
}
IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
IPSTATS_MIB_FRAGOKS);
- kfree_skb(skb);
+ consume_skb(skb);
return err;
fail:
@@ -1181,6 +1187,29 @@ static inline struct ipv6_rt_hdr *ip6_rthdr_dup(struct ipv6_rt_hdr *src,
return src ? kmemdup(src, (src->hdrlen + 1) * 8, gfp) : NULL;
}
+static void ip6_append_data_mtu(int *mtu,
+ int *maxfraglen,
+ unsigned int fragheaderlen,
+ struct sk_buff *skb,
+ struct rt6_info *rt)
+{
+ if (!(rt->dst.flags & DST_XFRM_TUNNEL)) {
+ if (skb == NULL) {
+ /* first fragment, reserve header_len */
+ *mtu = *mtu - rt->dst.header_len;
+
+ } else {
+ /*
+ * this fragment is not first, the headers
+ * space is regarded as data space.
+ */
+ *mtu = dst_mtu(rt->dst.path);
+ }
+ *maxfraglen = ((*mtu - fragheaderlen) & ~7)
+ + fragheaderlen - sizeof(struct frag_hdr);
+ }
+}
+
int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
int offset, int len, int odd, struct sk_buff *skb),
void *from, int length, int transhdrlen,
@@ -1190,7 +1219,7 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
struct inet_sock *inet = inet_sk(sk);
struct ipv6_pinfo *np = inet6_sk(sk);
struct inet_cork *cork;
- struct sk_buff *skb;
+ struct sk_buff *skb, *skb_prev = NULL;
unsigned int maxfraglen, fragheaderlen;
int exthdrlen;
int dst_exthdrlen;
@@ -1199,7 +1228,6 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
int copy;
int err;
int offset = 0;
- int csummode = CHECKSUM_NONE;
__u8 tx_flags = 0;
if (flags&MSG_PROBE)
@@ -1248,8 +1276,12 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
inet->cork.fl.u.ip6 = *fl6;
np->cork.hop_limit = hlimit;
np->cork.tclass = tclass;
- mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ?
- rt->dst.dev->mtu : dst_mtu(&rt->dst);
+ if (rt->dst.flags & DST_XFRM_TUNNEL)
+ mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ?
+ rt->dst.dev->mtu : dst_mtu(&rt->dst);
+ else
+ mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ?
+ rt->dst.dev->mtu : dst_mtu(rt->dst.path);
if (np->frag_size < mtu) {
if (np->frag_size)
mtu = np->frag_size;
@@ -1345,25 +1377,27 @@ int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
unsigned int fraglen;
unsigned int fraggap;
unsigned int alloclen;
- struct sk_buff *skb_prev;
alloc_new_skb:
- skb_prev = skb;
-
/* There's no room in the current skb */
- if (skb_prev)
- fraggap = skb_prev->len - maxfraglen;
+ if (skb)
+ fraggap = skb->len - maxfraglen;
else
fraggap = 0;
+ /* update mtu and maxfraglen if necessary */
+ if (skb == NULL || skb_prev == NULL)
+ ip6_append_data_mtu(&mtu, &maxfraglen,
+ fragheaderlen, skb, rt);
+
+ skb_prev = skb;
/*
* If remaining data exceeds the mtu,
* we know we need more fragment(s).
*/
datalen = length + fraggap;
- if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen)
- datalen = maxfraglen - fragheaderlen;
- fraglen = datalen + fragheaderlen;
+ if (datalen > (cork->length <= mtu && !(cork->flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen)
+ datalen = maxfraglen - fragheaderlen - rt->dst.trailer_len;
if ((flags & MSG_MORE) &&
!(rt->dst.dev->features&NETIF_F_SG))
alloclen = mtu;
@@ -1372,13 +1406,16 @@ alloc_new_skb:
alloclen += dst_exthdrlen;
- /*
- * The last fragment gets additional space at tail.
- * Note: we overallocate on fragments with MSG_MODE
- * because we have no idea if we're the last one.
- */
- if (datalen == length + fraggap)
- alloclen += rt->dst.trailer_len;
+ if (datalen != length + fraggap) {
+ /*
+ * this is not the last fragment, the trailer
+ * space is regarded as data space.
+ */
+ datalen += rt->dst.trailer_len;
+ }
+
+ alloclen += rt->dst.trailer_len;
+ fraglen = datalen + fragheaderlen;
/*
* We just reserve space for fragment header.
@@ -1412,7 +1449,7 @@ alloc_new_skb:
/*
* Fill in the control structures
*/
- skb->ip_summed = csummode;
+ skb->ip_summed = CHECKSUM_NONE;
skb->csum = 0;
/* reserve for fragmentation and ipsec header */
skb_reserve(skb, hh_len + sizeof(struct frag_hdr) +
@@ -1455,7 +1492,6 @@ alloc_new_skb:
transhdrlen = 0;
exthdrlen = 0;
dst_exthdrlen = 0;
- csummode = CHECKSUM_NONE;
/*
* Put the packet on the pending queue
@@ -1535,6 +1571,7 @@ error:
IP6_INC_STATS(sock_net(sk), rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
return err;
}
+EXPORT_SYMBOL_GPL(ip6_append_data);
static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np)
{
@@ -1638,6 +1675,7 @@ error:
IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
goto out;
}
+EXPORT_SYMBOL_GPL(ip6_push_pending_frames);
void ip6_flush_pending_frames(struct sock *sk)
{
@@ -1652,3 +1690,4 @@ void ip6_flush_pending_frames(struct sock *sk)
ip6_cork_release(inet_sk(sk), inet6_sk(sk));
}
+EXPORT_SYMBOL_GPL(ip6_flush_pending_frames);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-04-14 21:11:22 +0000