}
}
-static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len,
- struct in6_addr *saddr,
- struct in6_addr *daddr,
- unsigned long base)
+/* add pseudo-header to DCCP checksum stored in skb->csum */
+static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb,
+ struct in6_addr *saddr,
+ struct in6_addr *daddr)
{
- return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base);
+ return csum_ipv6_magic(saddr, daddr, skb->len, IPPROTO_DCCP, skb->csum);
}
-static __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
+static inline void dccp_v6_send_check(struct sock *sk, int unused_value,
+ struct sk_buff *skb)
{
- const struct dccp_hdr *dh = dccp_hdr(skb);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct dccp_hdr *dh = dccp_hdr(skb);
+
+ dccp_csum_outgoing(skb);
+ dh->dccph_checksum = dccp_v6_csum_finish(skb, &np->saddr, &np->daddr);
+}
- if (skb->protocol == htons(ETH_P_IPV6))
- return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
- skb->nh.ipv6h->saddr.s6_addr32,
- dh->dccph_dport,
- dh->dccph_sport);
+static inline __u32 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
+ __be16 sport, __be16 dport )
+{
+ return secure_tcpv6_sequence_number(saddr, daddr, sport, dport);
+}
+
+static inline __u32 dccp_v6_init_sequence(struct sk_buff *skb)
+{
+ return secure_dccpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
+ skb->nh.ipv6h->saddr.s6_addr32,
+ dccp_hdr(skb)->dccph_dport,
+ dccp_hdr(skb)->dccph_sport );
- return secure_dccp_sequence_number(skb->nh.iph->daddr,
- skb->nh.iph->saddr,
- dh->dccph_dport,
- dh->dccph_sport);
}
static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
if (skb != NULL) {
struct dccp_hdr *dh = dccp_hdr(skb);
- dh->dccph_checksum = dccp_v6_check(dh, skb->len,
- &ireq6->loc_addr,
- &ireq6->rmt_addr,
- csum_partial((char *)dh,
- skb->len,
- skb->csum));
+ dh->dccph_checksum = dccp_v6_csum_finish(skb,
+ &ireq6->loc_addr,
+ &ireq6->rmt_addr);
ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
err = ip6_xmit(sk, skb, &fl, opt, 0);
- if (err == NET_XMIT_CN)
- err = 0;
+ err = net_xmit_eval(err);
}
done:
kfree_skb(inet6_rsk(req)->pktopts);
}
-static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
-{
- struct ipv6_pinfo *np = inet6_sk(sk);
- struct dccp_hdr *dh = dccp_hdr(skb);
-
- dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr,
- len, IPPROTO_DCCP,
- csum_partial((char *)dh,
- dh->dccph_doff << 2,
- skb->csum));
-}
-
-static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
+static void dccp_v6_ctl_send_reset(struct sock *sk, struct sk_buff *rxskb)
{
struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
sizeof(struct dccp_hdr_reset);
struct sk_buff *skb;
struct flowi fl;
- u64 seqno;
+ u64 seqno = 0;
if (rxdh->dccph_type == DCCP_PKT_RESET)
return;
skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
GFP_ATOMIC);
if (skb == NULL)
- return;
+ return;
skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
DCCP_SKB_CB(rxskb)->dccpd_reset_code;
/* See "8.3.1. Abnormal Termination" in RFC 4340 */
- seqno = 0;
if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
dccp_hdr_set_seq(dh, seqno);
- dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
- DCCP_SKB_CB(rxskb)->dccpd_seq);
+ dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), DCCP_SKB_CB(rxskb)->dccpd_seq);
+
+ dccp_csum_outgoing(skb);
+ dh->dccph_checksum = dccp_v6_csum_finish(skb, &rxskb->nh.ipv6h->saddr,
+ &rxskb->nh.ipv6h->daddr);
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);
- dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
- sizeof(*dh), IPPROTO_DCCP,
- skb->csum);
+
fl.proto = IPPROTO_DCCP;
fl.oif = inet6_iif(rxskb);
fl.fl_ip_dport = dh->dccph_dport;
struct dccp_request_sock *dreq;
struct inet6_request_sock *ireq6;
struct ipv6_pinfo *np = inet6_sk(sk);
- const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
+ const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
__u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
if (dccp_bad_service_code(sk, service)) {
reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
goto drop;
- }
+ }
/*
* There are no SYN attacks on IPv6, yet...
*/
/*
* Step 3: Process LISTEN state
*
- * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
+ * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
*
- * In fact we defer setting S.GSR, S.SWL, S.SWH to
- * dccp_create_openreq_child.
+ * In fact we defer setting S.GSR, S.SWL, S.SWH to
+ * dccp_create_openreq_child.
*/
dreq = dccp_rsk(req);
dreq->dreq_isr = dcb->dccpd_seq;
- dreq->dreq_iss = dccp_v6_init_sequence(sk, skb);
+ dreq->dreq_iss = dccp_v6_init_sequence(skb);
dreq->dreq_service = service;
if (dccp_v6_send_response(sk, req, NULL))
looks not very well thought. For now we latch
options, received in the last packet, enqueued
by tcp. Feel free to propose better solution.
- --ANK (980728)
+ --ANK (980728)
*/
if (np->rxopt.all)
/*
return 0;
}
+ /*
+ * Step 3: Process LISTEN state
+ * If S.state == LISTEN,
+ * If P.type == Request or P contains a valid Init Cookie option,
+ * (* Must scan the packet's options to check for Init
+ * Cookies. Only Init Cookies are processed here,
+ * however; other options are processed in Step 8. This
+ * scan need only be performed if the endpoint uses Init
+ * Cookies *)
+ * (* Generate a new socket and switch to that socket *)
+ * Set S := new socket for this port pair
+ * S.state = RESPOND
+ * Choose S.ISS (initial seqno) or set from Init Cookies
+ * Initialize S.GAR := S.ISS
+ * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies
+ * Continue with S.state == RESPOND
+ * (* A Response packet will be generated in Step 11 *)
+ * Otherwise,
+ * Generate Reset(No Connection) unless P.type == Reset
+ * Drop packet and return
+ *
+ * NOTE: the check for the packet types is done in
+ * dccp_rcv_state_process
+ */
if (sk->sk_state == DCCP_LISTEN) {
struct sock *nsk = dccp_v6_hnd_req(sk, skb);
* otherwise we just shortcircuit this and continue with
* the new socket..
*/
- if (nsk != sk) {
+ if (nsk != sk) {
if (dccp_child_process(sk, nsk, skb))
goto reset;
if (opt_skb != NULL)
return 0;
reset:
- dccp_v6_ctl_send_reset(skb);
+ dccp_v6_ctl_send_reset(sk, skb);
discard:
if (opt_skb != NULL)
__kfree_skb(opt_skb);
const struct dccp_hdr *dh;
struct sk_buff *skb = *pskb;
struct sock *sk;
+ int min_cov;
- /* Step 1: Check header basics: */
+ /* Step 1: Check header basics */
if (dccp_invalid_packet(skb))
goto discard_it;
+ /* Step 1: If header checksum is incorrect, drop packet and return. */
+ if (dccp_v6_csum_finish(skb, &skb->nh.ipv6h->saddr,
+ &skb->nh.ipv6h->daddr)) {
+ DCCP_WARN("dropped packet with invalid checksum\n");
+ goto discard_it;
+ }
+
dh = dccp_hdr(skb);
DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb);
DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
/* Step 2:
- * Look up flow ID in table and get corresponding socket */
+ * Look up flow ID in table and get corresponding socket */
sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
dh->dccph_sport,
&skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
inet6_iif(skb));
/*
* Step 2:
- * If no socket ...
- * Generate Reset(No Connection) unless P.type == Reset
- * Drop packet and return
+ * If no socket ...
*/
if (sk == NULL) {
dccp_pr_debug("failed to look up flow ID in table and "
/*
* Step 2:
- * ... or S.state == TIMEWAIT,
+ * ... or S.state == TIMEWAIT,
* Generate Reset(No Connection) unless P.type == Reset
* Drop packet and return
*/
goto no_dccp_socket;
}
+ /*
+ * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
+ * o if MinCsCov = 0, only packets with CsCov = 0 are accepted
+ * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov
+ */
+ min_cov = dccp_sk(sk)->dccps_pcrlen;
+ if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) {
+ dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n",
+ dh->dccph_cscov, min_cov);
+ /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */
+ goto discard_and_relse;
+ }
+
if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
goto discard_and_relse;
- return sk_receive_skb(sk, skb) ? -1 : 0;
+ return sk_receive_skb(sk, skb, 1) ? -1 : 0;
no_dccp_socket:
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
goto discard_it;
/*
* Step 2:
+ * If no socket ...
* Generate Reset(No Connection) unless P.type == Reset
* Drop packet and return
*/
if (dh->dccph_type != DCCP_PKT_RESET) {
DCCP_SKB_CB(skb)->dccpd_reset_code =
DCCP_RESET_CODE_NO_CONNECTION;
- dccp_v6_ctl_send_reset(skb);
+ dccp_v6_ctl_send_reset(sk, skb);
}
discard_it:
if (final_p)
ipv6_addr_copy(&fl.fl6_dst, final_p);
- err = xfrm_lookup(&dst, &fl, sk, 0);
+ err = xfrm_lookup(&dst, &fl, sk, 1);
if (err < 0)
goto failure;
err = inet6_hash_connect(&dccp_death_row, sk);
if (err)
goto late_failure;
- /* FIXME */
-#if 0
- dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32,
- np->daddr.s6_addr32,
- inet->sport,
- inet->dport);
-#endif
+
+ dp->dccps_iss = secure_dccpv6_sequence_number(np->saddr.s6_addr32,
+ np->daddr.s6_addr32,
+ inet->sport, inet->dport);
err = dccp_connect(sk);
if (err)
goto late_failure;
projects / powerpc.git / blobdiff