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authorGerrit Renker <gerrit@erg.abdn.ac.uk>2006-11-10 12:32:01 -0200
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-02 21:21:58 -0800
commit8a73cd09d96aa01743316657fc4e6864fe79b703 (patch)
treefa22ed8ac78c5c76cc8ee3afd8bf72607290d42d /net/dccp/ipv6.c
parentf6484f7c7ad22e4bb018875c386d6a7aaa441426 (diff)
[DCCP]: calling dccp_v{4,6}_reqsk_send_ack is a BUG
This patch removes two functions, the send_ack functions of request_sock, which are not called/used by the DCCP code. It is correct that these functions are not called, below is a justification why calling these functions (on a passive socket in the LISTEN/RESPOND state) would mean a DCCP protocol violation. A) Background: using request_sock in TCP:
Diffstat (limited to 'net/dccp/ipv6.c')
-rw-r--r--net/dccp/ipv6.c57
1 files changed, 1 insertions, 56 deletions
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index dee08530157..718509dcb24 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -37,8 +37,6 @@
static struct socket *dccp_v6_ctl_socket;
static void dccp_v6_ctl_send_reset(struct sk_buff *skb);
-static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
- struct request_sock *req);
static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb);
static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
@@ -493,7 +491,7 @@ static struct request_sock_ops dccp6_request_sock_ops = {
.family = AF_INET6,
.obj_size = sizeof(struct dccp6_request_sock),
.rtx_syn_ack = dccp_v6_send_response,
- .send_ack = dccp_v6_reqsk_send_ack,
+ .send_ack = dccp_reqsk_send_ack,
.destructor = dccp_v6_reqsk_destructor,
.send_reset = dccp_v6_ctl_send_reset,
};
@@ -582,59 +580,6 @@ static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
kfree_skb(skb);
}
-static void dccp_v6_reqsk_send_ack(struct sk_buff *rxskb,
- struct request_sock *req)
-{
- struct flowi fl;
- struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
- const u32 dccp_hdr_ack_len = sizeof(struct dccp_hdr) +
- sizeof(struct dccp_hdr_ext) +
- sizeof(struct dccp_hdr_ack_bits);
- struct sk_buff *skb;
-
- skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
- GFP_ATOMIC);
- if (skb == NULL)
- return;
-
- skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
-
- dh = dccp_zeroed_hdr(skb, dccp_hdr_ack_len);
-
- /* Build DCCP header and checksum it. */
- dh->dccph_type = DCCP_PKT_ACK;
- dh->dccph_sport = rxdh->dccph_dport;
- dh->dccph_dport = rxdh->dccph_sport;
- dh->dccph_doff = dccp_hdr_ack_len / 4;
- dh->dccph_x = 1;
-
- dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq);
- dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
- DCCP_SKB_CB(rxskb)->dccpd_seq);
-
- memset(&fl, 0, sizeof(fl));
- ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
- ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
-
- /* FIXME: calculate checksum, IPv4 also should... */
-
- fl.proto = IPPROTO_DCCP;
- fl.oif = inet6_iif(rxskb);
- fl.fl_ip_dport = dh->dccph_dport;
- fl.fl_ip_sport = dh->dccph_sport;
- security_req_classify_flow(req, &fl);
-
- if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
- if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
- ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
- DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
- return;
- }
- }
-
- kfree_skb(skb);
-}
-
static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
{
const struct dccp_hdr *dh = dccp_hdr(skb);