diff options
Diffstat (limited to '')
| -rw-r--r-- | net/tipc/msg.c | 109 |
1 files changed, 70 insertions, 39 deletions
diff --git a/net/tipc/msg.c b/net/tipc/msg.c index da67c8d3edc6..b6eb90cd3ef7 100644 --- a/net/tipc/msg.c +++ b/net/tipc/msg.c @@ -70,25 +70,23 @@ struct sk_buff *tipc_buf_acquire(u32 size) return skb; } -void tipc_msg_init(struct net *net, struct tipc_msg *m, u32 user, u32 type, - u32 hsize, u32 destnode) +void tipc_msg_init(u32 own_node, struct tipc_msg *m, u32 user, u32 type, + u32 hsize, u32 dnode) { - struct tipc_net *tn = net_generic(net, tipc_net_id); - memset(m, 0, hsize); msg_set_version(m); msg_set_user(m, user); msg_set_hdr_sz(m, hsize); msg_set_size(m, hsize); - msg_set_prevnode(m, tn->own_addr); + msg_set_prevnode(m, own_node); msg_set_type(m, type); if (hsize > SHORT_H_SIZE) { - msg_set_orignode(m, tn->own_addr); - msg_set_destnode(m, destnode); + msg_set_orignode(m, own_node); + msg_set_destnode(m, dnode); } } -struct sk_buff *tipc_msg_create(struct net *net, uint user, uint type, +struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz, uint data_sz, u32 dnode, u32 onode, u32 dport, u32 oport, int errcode) { @@ -100,9 +98,8 @@ struct sk_buff *tipc_msg_create(struct net *net, uint user, uint type, return NULL; msg = buf_msg(buf); - tipc_msg_init(net, msg, user, type, hdr_sz, dnode); + tipc_msg_init(onode, msg, user, type, hdr_sz, dnode); msg_set_size(msg, hdr_sz + data_sz); - msg_set_prevnode(msg, onode); msg_set_origport(msg, oport); msg_set_destport(msg, dport); msg_set_errcode(msg, errcode); @@ -195,7 +192,7 @@ err: * * Returns message data size or errno: -ENOMEM, -EFAULT */ -int tipc_msg_build(struct net *net, struct tipc_msg *mhdr, struct msghdr *m, +int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m, int offset, int dsz, int pktmax, struct sk_buff_head *list) { int mhsz = msg_hdr_sz(mhdr); @@ -227,8 +224,8 @@ int tipc_msg_build(struct net *net, struct tipc_msg *mhdr, struct msghdr *m, } /* Prepare reusable fragment header */ - tipc_msg_init(net, &pkthdr, MSG_FRAGMENTER, FIRST_FRAGMENT, INT_H_SIZE, - msg_destnode(mhdr)); + tipc_msg_init(msg_prevnode(mhdr), &pkthdr, MSG_FRAGMENTER, + FIRST_FRAGMENT, INT_H_SIZE, msg_destnode(mhdr)); msg_set_size(&pkthdr, pktmax); msg_set_fragm_no(&pkthdr, pktno); @@ -330,6 +327,40 @@ bool tipc_msg_bundle(struct sk_buff_head *list, struct sk_buff *skb, u32 mtu) } /** + * tipc_msg_extract(): extract bundled inner packet from buffer + * @skb: linear outer buffer, to be extracted from. + * @iskb: extracted inner buffer, to be returned + * @pos: position of msg to be extracted. Returns with pointer of next msg + * Consumes outer buffer when last packet extracted + * Returns true when when there is an extracted buffer, otherwise false + */ +bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos) +{ + struct tipc_msg *msg = buf_msg(skb); + int imsz; + struct tipc_msg *imsg = (struct tipc_msg *)(msg_data(msg) + *pos); + + /* Is there space left for shortest possible message? */ + if (*pos > (msg_data_sz(msg) - SHORT_H_SIZE)) + goto none; + imsz = msg_size(imsg); + + /* Is there space left for current message ? */ + if ((*pos + imsz) > msg_data_sz(msg)) + goto none; + *iskb = tipc_buf_acquire(imsz); + if (!*iskb) + goto none; + skb_copy_to_linear_data(*iskb, imsg, imsz); + *pos += align(imsz); + return true; +none: + kfree_skb(skb); + *iskb = NULL; + return false; +} + +/** * tipc_msg_make_bundle(): Create bundle buf and append message to its tail * @list: the buffer chain * @skb: buffer to be appended and replaced @@ -338,7 +369,7 @@ bool tipc_msg_bundle(struct sk_buff_head *list, struct sk_buff *skb, u32 mtu) * Replaces buffer if successful * Returns true if success, otherwise false */ -bool tipc_msg_make_bundle(struct net *net, struct sk_buff_head *list, +bool tipc_msg_make_bundle(struct sk_buff_head *list, struct sk_buff *skb, u32 mtu, u32 dnode) { struct sk_buff *bskb; @@ -362,7 +393,8 @@ bool tipc_msg_make_bundle(struct net *net, struct sk_buff_head *list, skb_trim(bskb, INT_H_SIZE); bmsg = buf_msg(bskb); - tipc_msg_init(net, bmsg, MSG_BUNDLER, 0, INT_H_SIZE, dnode); + tipc_msg_init(msg_prevnode(msg), bmsg, MSG_BUNDLER, 0, + INT_H_SIZE, dnode); msg_set_seqno(bmsg, msg_seqno(msg)); msg_set_ack(bmsg, msg_ack(msg)); msg_set_bcast_ack(bmsg, msg_bcast_ack(msg)); @@ -379,10 +411,9 @@ bool tipc_msg_make_bundle(struct net *net, struct sk_buff_head *list, * Consumes buffer if failure * Returns true if success, otherwise false */ -bool tipc_msg_reverse(struct net *net, struct sk_buff *buf, u32 *dnode, +bool tipc_msg_reverse(u32 own_addr, struct sk_buff *buf, u32 *dnode, int err) { - struct tipc_net *tn = net_generic(net, tipc_net_id); struct tipc_msg *msg = buf_msg(buf); uint imp = msg_importance(msg); struct tipc_msg ohdr; @@ -402,7 +433,7 @@ bool tipc_msg_reverse(struct net *net, struct sk_buff *buf, u32 *dnode, msg_set_errcode(msg, err); msg_set_origport(msg, msg_destport(&ohdr)); msg_set_destport(msg, msg_origport(&ohdr)); - msg_set_prevnode(msg, tn->own_addr); + msg_set_prevnode(msg, own_addr); if (!msg_short(msg)) { msg_set_orignode(msg, msg_destnode(&ohdr)); msg_set_destnode(msg, msg_orignode(&ohdr)); @@ -414,43 +445,43 @@ bool tipc_msg_reverse(struct net *net, struct sk_buff *buf, u32 *dnode, return true; exit: kfree_skb(buf); + *dnode = 0; return false; } /** - * tipc_msg_eval: determine fate of message that found no destination - * @buf: the buffer containing the message. - * @dnode: return value: next-hop node, if message to be forwarded - * @err: error code to use, if message to be rejected - * + * tipc_msg_lookup_dest(): try to find new destination for named message + * @skb: the buffer containing the message. + * @dnode: return value: next-hop node, if destination found + * @err: return value: error code to use, if message to be rejected * Does not consume buffer - * Returns 0 (TIPC_OK) if message ok and we can try again, -TIPC error - * code if message to be rejected + * Returns true if a destination is found, false otherwise */ -int tipc_msg_eval(struct net *net, struct sk_buff *buf, u32 *dnode) +bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, + u32 *dnode, int *err) { - struct tipc_msg *msg = buf_msg(buf); + struct tipc_msg *msg = buf_msg(skb); u32 dport; - if (msg_type(msg) != TIPC_NAMED_MSG) - return -TIPC_ERR_NO_PORT; - if (skb_linearize(buf)) - return -TIPC_ERR_NO_NAME; - if (msg_data_sz(msg) > MAX_FORWARD_SIZE) - return -TIPC_ERR_NO_NAME; + if (!msg_isdata(msg)) + return false; + if (!msg_named(msg)) + return false; + *err = -TIPC_ERR_NO_NAME; + if (skb_linearize(skb)) + return false; if (msg_reroute_cnt(msg) > 0) - return -TIPC_ERR_NO_NAME; - + return false; *dnode = addr_domain(net, msg_lookup_scope(msg)); dport = tipc_nametbl_translate(net, msg_nametype(msg), - msg_nameinst(msg), - dnode); + msg_nameinst(msg), dnode); if (!dport) - return -TIPC_ERR_NO_NAME; + return false; msg_incr_reroute_cnt(msg); msg_set_destnode(msg, *dnode); msg_set_destport(msg, dport); - return TIPC_OK; + *err = TIPC_OK; + return true; } /* tipc_msg_reassemble() - clone a buffer chain of fragments and |