Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/net/sunrpc/svcsock.c |
| 3 | * |
| 4 | * These are the RPC server socket internals. |
| 5 | * |
| 6 | * The server scheduling algorithm does not always distribute the load |
| 7 | * evenly when servicing a single client. May need to modify the |
Tom Tucker | f6150c3 | 2007-12-30 21:07:57 -0600 | [diff] [blame] | 8 | * svc_xprt_enqueue procedure... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * |
| 10 | * TCP support is largely untested and may be a little slow. The problem |
| 11 | * is that we currently do two separate recvfrom's, one for the 4-byte |
| 12 | * record length, and the second for the actual record. This could possibly |
| 13 | * be improved by always reading a minimum size of around 100 bytes and |
| 14 | * tucking any superfluous bytes away in a temporary store. Still, that |
| 15 | * leaves write requests out in the rain. An alternative may be to peek at |
| 16 | * the first skb in the queue, and if it matches the next TCP sequence |
| 17 | * number, to extract the record marker. Yuck. |
| 18 | * |
| 19 | * Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de> |
| 20 | */ |
| 21 | |
Ilpo Järvinen | 172589c | 2007-08-28 15:50:33 -0700 | [diff] [blame] | 22 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/sched.h> |
Paul Gortmaker | 3a9a231 | 2011-05-27 09:12:25 -0400 | [diff] [blame] | 24 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/errno.h> |
| 26 | #include <linux/fcntl.h> |
| 27 | #include <linux/net.h> |
| 28 | #include <linux/in.h> |
| 29 | #include <linux/inet.h> |
| 30 | #include <linux/udp.h> |
Andrew Morton | 91483c4 | 2005-08-09 20:20:07 -0700 | [diff] [blame] | 31 | #include <linux/tcp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/unistd.h> |
| 33 | #include <linux/slab.h> |
| 34 | #include <linux/netdevice.h> |
| 35 | #include <linux/skbuff.h> |
NeilBrown | b41b66d | 2006-10-02 02:17:48 -0700 | [diff] [blame] | 36 | #include <linux/file.h> |
Nigel Cunningham | 7dfb710 | 2006-12-06 20:34:23 -0800 | [diff] [blame] | 37 | #include <linux/freezer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <net/sock.h> |
| 39 | #include <net/checksum.h> |
| 40 | #include <net/ip.h> |
Chuck Lever | b92503b | 2007-02-12 00:53:36 -0800 | [diff] [blame] | 41 | #include <net/ipv6.h> |
Chuck Lever | b7872fe | 2008-04-14 12:27:01 -0400 | [diff] [blame] | 42 | #include <net/tcp.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 43 | #include <net/tcp_states.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <asm/uaccess.h> |
| 45 | #include <asm/ioctls.h> |
| 46 | |
| 47 | #include <linux/sunrpc/types.h> |
Chuck Lever | ad06e4b | 2007-02-12 00:53:32 -0800 | [diff] [blame] | 48 | #include <linux/sunrpc/clnt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/sunrpc/xdr.h> |
Chuck Lever | c0401ea | 2008-04-14 12:27:30 -0400 | [diff] [blame] | 50 | #include <linux/sunrpc/msg_prot.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <linux/sunrpc/svcsock.h> |
| 52 | #include <linux/sunrpc/stats.h> |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 53 | #include <linux/sunrpc/xprt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
H Hartley Sweeten | 177e4f9 | 2011-06-20 17:54:51 -0700 | [diff] [blame] | 55 | #include "sunrpc.h" |
| 56 | |
Tom Tucker | 360d873 | 2007-12-30 21:07:17 -0600 | [diff] [blame] | 57 | #define RPCDBG_FACILITY RPCDBG_SVCXPRT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
| 59 | |
| 60 | static struct svc_sock *svc_setup_socket(struct svc_serv *, struct socket *, |
Chuck Lever | 6b17433 | 2007-02-12 00:53:28 -0800 | [diff] [blame] | 61 | int *errp, int flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | static void svc_udp_data_ready(struct sock *, int); |
| 63 | static int svc_udp_recvfrom(struct svc_rqst *); |
| 64 | static int svc_udp_sendto(struct svc_rqst *); |
Tom Tucker | 755ccea | 2007-12-30 21:07:27 -0600 | [diff] [blame] | 65 | static void svc_sock_detach(struct svc_xprt *); |
Trond Myklebust | 69b6ba3 | 2008-12-23 16:30:11 -0500 | [diff] [blame] | 66 | static void svc_tcp_sock_detach(struct svc_xprt *); |
Tom Tucker | 755ccea | 2007-12-30 21:07:27 -0600 | [diff] [blame] | 67 | static void svc_sock_free(struct svc_xprt *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 69 | static struct svc_xprt *svc_create_socket(struct svc_serv *, int, |
Pavel Emelyanov | 62832c0 | 2010-09-29 16:04:18 +0400 | [diff] [blame] | 70 | struct net *, struct sockaddr *, |
| 71 | int, int); |
Trond Myklebust | 9e00abc | 2011-07-13 19:20:49 -0400 | [diff] [blame] | 72 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
Andy Adamson | 1f11a03 | 2011-01-06 02:04:26 +0000 | [diff] [blame] | 73 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
| 74 | struct net *, struct sockaddr *, |
| 75 | int, int); |
| 76 | static void svc_bc_sock_free(struct svc_xprt *xprt); |
Trond Myklebust | 9e00abc | 2011-07-13 19:20:49 -0400 | [diff] [blame] | 77 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
Andy Adamson | 1f11a03 | 2011-01-06 02:04:26 +0000 | [diff] [blame] | 78 | |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 79 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 80 | static struct lock_class_key svc_key[2]; |
| 81 | static struct lock_class_key svc_slock_key[2]; |
| 82 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 83 | static void svc_reclassify_socket(struct socket *sock) |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 84 | { |
| 85 | struct sock *sk = sock->sk; |
John Heffner | 02b3d34 | 2007-09-12 10:42:12 +0200 | [diff] [blame] | 86 | BUG_ON(sock_owned_by_user(sk)); |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 87 | switch (sk->sk_family) { |
| 88 | case AF_INET: |
| 89 | sock_lock_init_class_and_name(sk, "slock-AF_INET-NFSD", |
Tom Tucker | def13d7 | 2007-12-30 21:08:08 -0600 | [diff] [blame] | 90 | &svc_slock_key[0], |
| 91 | "sk_xprt.xpt_lock-AF_INET-NFSD", |
| 92 | &svc_key[0]); |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 93 | break; |
| 94 | |
| 95 | case AF_INET6: |
| 96 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-NFSD", |
Tom Tucker | def13d7 | 2007-12-30 21:08:08 -0600 | [diff] [blame] | 97 | &svc_slock_key[1], |
| 98 | "sk_xprt.xpt_lock-AF_INET6-NFSD", |
| 99 | &svc_key[1]); |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 100 | break; |
| 101 | |
| 102 | default: |
| 103 | BUG(); |
| 104 | } |
| 105 | } |
| 106 | #else |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 107 | static void svc_reclassify_socket(struct socket *sock) |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 108 | { |
| 109 | } |
| 110 | #endif |
| 111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | /* |
| 113 | * Release an skbuff after use |
| 114 | */ |
Tom Tucker | 5148bf4 | 2007-12-30 21:07:25 -0600 | [diff] [blame] | 115 | static void svc_release_skb(struct svc_rqst *rqstp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | { |
Tom Tucker | 5148bf4 | 2007-12-30 21:07:25 -0600 | [diff] [blame] | 117 | struct sk_buff *skb = rqstp->rq_xprt_ctxt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | if (skb) { |
Tom Tucker | 57b1d3b | 2007-12-30 21:08:22 -0600 | [diff] [blame] | 120 | struct svc_sock *svsk = |
| 121 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
Tom Tucker | 5148bf4 | 2007-12-30 21:07:25 -0600 | [diff] [blame] | 122 | rqstp->rq_xprt_ctxt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | dprintk("svc: service %p, releasing skb %p\n", rqstp, skb); |
Eric Dumazet | 9d410c7 | 2009-10-30 05:03:53 +0000 | [diff] [blame] | 125 | skb_free_datagram_locked(svsk->sk_sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | } |
| 128 | |
Chuck Lever | b92503b | 2007-02-12 00:53:36 -0800 | [diff] [blame] | 129 | union svc_pktinfo_u { |
| 130 | struct in_pktinfo pkti; |
Chuck Lever | b92503b | 2007-02-12 00:53:36 -0800 | [diff] [blame] | 131 | struct in6_pktinfo pkti6; |
Chuck Lever | b92503b | 2007-02-12 00:53:36 -0800 | [diff] [blame] | 132 | }; |
David S. Miller | bc375ea | 2007-04-12 13:35:59 -0700 | [diff] [blame] | 133 | #define SVC_PKTINFO_SPACE \ |
| 134 | CMSG_SPACE(sizeof(union svc_pktinfo_u)) |
Chuck Lever | b92503b | 2007-02-12 00:53:36 -0800 | [diff] [blame] | 135 | |
| 136 | static void svc_set_cmsg_data(struct svc_rqst *rqstp, struct cmsghdr *cmh) |
| 137 | { |
Tom Tucker | 57b1d3b | 2007-12-30 21:08:22 -0600 | [diff] [blame] | 138 | struct svc_sock *svsk = |
| 139 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| 140 | switch (svsk->sk_sk->sk_family) { |
Chuck Lever | b92503b | 2007-02-12 00:53:36 -0800 | [diff] [blame] | 141 | case AF_INET: { |
| 142 | struct in_pktinfo *pki = CMSG_DATA(cmh); |
| 143 | |
| 144 | cmh->cmsg_level = SOL_IP; |
| 145 | cmh->cmsg_type = IP_PKTINFO; |
| 146 | pki->ipi_ifindex = 0; |
Mi Jinlong | 849a1cf | 2011-08-30 17:18:41 +0800 | [diff] [blame] | 147 | pki->ipi_spec_dst.s_addr = |
| 148 | svc_daddr_in(rqstp)->sin_addr.s_addr; |
Chuck Lever | b92503b | 2007-02-12 00:53:36 -0800 | [diff] [blame] | 149 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
| 150 | } |
| 151 | break; |
NeilBrown | 5a05ed7 | 2007-03-06 01:42:22 -0800 | [diff] [blame] | 152 | |
Chuck Lever | b92503b | 2007-02-12 00:53:36 -0800 | [diff] [blame] | 153 | case AF_INET6: { |
| 154 | struct in6_pktinfo *pki = CMSG_DATA(cmh); |
Mi Jinlong | 849a1cf | 2011-08-30 17:18:41 +0800 | [diff] [blame] | 155 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
Chuck Lever | b92503b | 2007-02-12 00:53:36 -0800 | [diff] [blame] | 156 | |
| 157 | cmh->cmsg_level = SOL_IPV6; |
| 158 | cmh->cmsg_type = IPV6_PKTINFO; |
Mi Jinlong | 849a1cf | 2011-08-30 17:18:41 +0800 | [diff] [blame] | 159 | pki->ipi6_ifindex = daddr->sin6_scope_id; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 160 | pki->ipi6_addr = daddr->sin6_addr; |
Chuck Lever | b92503b | 2007-02-12 00:53:36 -0800 | [diff] [blame] | 161 | cmh->cmsg_len = CMSG_LEN(sizeof(*pki)); |
| 162 | } |
| 163 | break; |
Chuck Lever | b92503b | 2007-02-12 00:53:36 -0800 | [diff] [blame] | 164 | } |
Chuck Lever | b92503b | 2007-02-12 00:53:36 -0800 | [diff] [blame] | 165 | } |
| 166 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | /* |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 168 | * send routine intended to be shared by the fore- and back-channel |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | */ |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 170 | int svc_send_common(struct socket *sock, struct xdr_buf *xdr, |
| 171 | struct page *headpage, unsigned long headoffset, |
| 172 | struct page *tailpage, unsigned long tailoffset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | int result; |
| 175 | int size; |
| 176 | struct page **ppage = xdr->pages; |
| 177 | size_t base = xdr->page_base; |
| 178 | unsigned int pglen = xdr->page_len; |
| 179 | unsigned int flags = MSG_MORE; |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 180 | int slen; |
| 181 | int len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
| 183 | slen = xdr->len; |
| 184 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | /* send head */ |
| 186 | if (slen == xdr->head[0].iov_len) |
| 187 | flags = 0; |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 188 | len = kernel_sendpage(sock, headpage, headoffset, |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 189 | xdr->head[0].iov_len, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | if (len != xdr->head[0].iov_len) |
| 191 | goto out; |
| 192 | slen -= xdr->head[0].iov_len; |
| 193 | if (slen == 0) |
| 194 | goto out; |
| 195 | |
| 196 | /* send page data */ |
| 197 | size = PAGE_SIZE - base < pglen ? PAGE_SIZE - base : pglen; |
| 198 | while (pglen > 0) { |
| 199 | if (slen == size) |
| 200 | flags = 0; |
Sridhar Samudrala | e6242e9 | 2006-08-07 20:58:01 -0700 | [diff] [blame] | 201 | result = kernel_sendpage(sock, *ppage, base, size, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | if (result > 0) |
| 203 | len += result; |
| 204 | if (result != size) |
| 205 | goto out; |
| 206 | slen -= size; |
| 207 | pglen -= size; |
| 208 | size = PAGE_SIZE < pglen ? PAGE_SIZE : pglen; |
| 209 | base = 0; |
| 210 | ppage++; |
| 211 | } |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | /* send tail */ |
| 214 | if (xdr->tail[0].iov_len) { |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 215 | result = kernel_sendpage(sock, tailpage, tailoffset, |
| 216 | xdr->tail[0].iov_len, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | if (result > 0) |
| 218 | len += result; |
| 219 | } |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 220 | |
| 221 | out: |
| 222 | return len; |
| 223 | } |
| 224 | |
| 225 | |
| 226 | /* |
| 227 | * Generic sendto routine |
| 228 | */ |
| 229 | static int svc_sendto(struct svc_rqst *rqstp, struct xdr_buf *xdr) |
| 230 | { |
| 231 | struct svc_sock *svsk = |
| 232 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| 233 | struct socket *sock = svsk->sk_sock; |
| 234 | union { |
| 235 | struct cmsghdr hdr; |
| 236 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; |
| 237 | } buffer; |
| 238 | struct cmsghdr *cmh = &buffer.hdr; |
| 239 | int len = 0; |
| 240 | unsigned long tailoff; |
| 241 | unsigned long headoff; |
| 242 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
| 243 | |
| 244 | if (rqstp->rq_prot == IPPROTO_UDP) { |
| 245 | struct msghdr msg = { |
| 246 | .msg_name = &rqstp->rq_addr, |
| 247 | .msg_namelen = rqstp->rq_addrlen, |
| 248 | .msg_control = cmh, |
| 249 | .msg_controllen = sizeof(buffer), |
| 250 | .msg_flags = MSG_MORE, |
| 251 | }; |
| 252 | |
| 253 | svc_set_cmsg_data(rqstp, cmh); |
| 254 | |
| 255 | if (sock_sendmsg(sock, &msg, 0) < 0) |
| 256 | goto out; |
| 257 | } |
| 258 | |
| 259 | tailoff = ((unsigned long)xdr->tail[0].iov_base) & (PAGE_SIZE-1); |
| 260 | headoff = 0; |
| 261 | len = svc_send_common(sock, xdr, rqstp->rq_respages[0], headoff, |
| 262 | rqstp->rq_respages[0], tailoff); |
| 263 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | out: |
Chuck Lever | ad06e4b | 2007-02-12 00:53:32 -0800 | [diff] [blame] | 265 | dprintk("svc: socket %p sendto([%p %Zu... ], %d) = %d (addr %s)\n", |
Tom Tucker | 57b1d3b | 2007-12-30 21:08:22 -0600 | [diff] [blame] | 266 | svsk, xdr->head[0].iov_base, xdr->head[0].iov_len, |
Chuck Lever | ad06e4b | 2007-02-12 00:53:32 -0800 | [diff] [blame] | 267 | xdr->len, len, svc_print_addr(rqstp, buf, sizeof(buf))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
| 269 | return len; |
| 270 | } |
| 271 | |
| 272 | /* |
NeilBrown | 80212d5 | 2006-10-02 02:17:47 -0700 | [diff] [blame] | 273 | * Report socket names for nfsdfs |
| 274 | */ |
Chuck Lever | e7942b9 | 2009-04-23 19:32:48 -0400 | [diff] [blame] | 275 | static int svc_one_sock_name(struct svc_sock *svsk, char *buf, int remaining) |
NeilBrown | 80212d5 | 2006-10-02 02:17:47 -0700 | [diff] [blame] | 276 | { |
Chuck Lever | 017cb47 | 2009-04-23 19:33:03 -0400 | [diff] [blame] | 277 | const struct sock *sk = svsk->sk_sk; |
| 278 | const char *proto_name = sk->sk_protocol == IPPROTO_UDP ? |
| 279 | "udp" : "tcp"; |
NeilBrown | 80212d5 | 2006-10-02 02:17:47 -0700 | [diff] [blame] | 280 | int len; |
| 281 | |
Chuck Lever | 017cb47 | 2009-04-23 19:33:03 -0400 | [diff] [blame] | 282 | switch (sk->sk_family) { |
Chuck Lever | e7942b9 | 2009-04-23 19:32:48 -0400 | [diff] [blame] | 283 | case PF_INET: |
| 284 | len = snprintf(buf, remaining, "ipv4 %s %pI4 %d\n", |
Chuck Lever | 017cb47 | 2009-04-23 19:33:03 -0400 | [diff] [blame] | 285 | proto_name, |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 286 | &inet_sk(sk)->inet_rcv_saddr, |
| 287 | inet_sk(sk)->inet_num); |
NeilBrown | 80212d5 | 2006-10-02 02:17:47 -0700 | [diff] [blame] | 288 | break; |
Chuck Lever | 58de2f8 | 2009-04-23 19:32:55 -0400 | [diff] [blame] | 289 | case PF_INET6: |
| 290 | len = snprintf(buf, remaining, "ipv6 %s %pI6 %d\n", |
Chuck Lever | 017cb47 | 2009-04-23 19:33:03 -0400 | [diff] [blame] | 291 | proto_name, |
| 292 | &inet6_sk(sk)->rcv_saddr, |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 293 | inet_sk(sk)->inet_num); |
NeilBrown | 80212d5 | 2006-10-02 02:17:47 -0700 | [diff] [blame] | 294 | break; |
| 295 | default: |
Chuck Lever | e7942b9 | 2009-04-23 19:32:48 -0400 | [diff] [blame] | 296 | len = snprintf(buf, remaining, "*unknown-%d*\n", |
Chuck Lever | 017cb47 | 2009-04-23 19:33:03 -0400 | [diff] [blame] | 297 | sk->sk_family); |
NeilBrown | 80212d5 | 2006-10-02 02:17:47 -0700 | [diff] [blame] | 298 | } |
Chuck Lever | e7942b9 | 2009-04-23 19:32:48 -0400 | [diff] [blame] | 299 | |
| 300 | if (len >= remaining) { |
| 301 | *buf = '\0'; |
| 302 | return -ENAMETOOLONG; |
NeilBrown | 80212d5 | 2006-10-02 02:17:47 -0700 | [diff] [blame] | 303 | } |
| 304 | return len; |
| 305 | } |
| 306 | |
Chuck Lever | 8435d34 | 2009-04-23 19:32:40 -0400 | [diff] [blame] | 307 | /** |
| 308 | * svc_sock_names - construct a list of listener names in a string |
| 309 | * @serv: pointer to RPC service |
| 310 | * @buf: pointer to a buffer to fill in with socket names |
| 311 | * @buflen: size of the buffer to be filled |
| 312 | * @toclose: pointer to '\0'-terminated C string containing the name |
| 313 | * of a listener to be closed |
| 314 | * |
| 315 | * Fills in @buf with a '\n'-separated list of names of listener |
| 316 | * sockets. If @toclose is not NULL, the socket named by @toclose |
| 317 | * is closed, and is not included in the output list. |
| 318 | * |
| 319 | * Returns positive length of the socket name string, or a negative |
| 320 | * errno value on error. |
| 321 | */ |
| 322 | int svc_sock_names(struct svc_serv *serv, char *buf, const size_t buflen, |
| 323 | const char *toclose) |
NeilBrown | 80212d5 | 2006-10-02 02:17:47 -0700 | [diff] [blame] | 324 | { |
NeilBrown | b41b66d | 2006-10-02 02:17:48 -0700 | [diff] [blame] | 325 | struct svc_sock *svsk, *closesk = NULL; |
NeilBrown | 80212d5 | 2006-10-02 02:17:47 -0700 | [diff] [blame] | 326 | int len = 0; |
| 327 | |
| 328 | if (!serv) |
| 329 | return 0; |
Chuck Lever | e7942b9 | 2009-04-23 19:32:48 -0400 | [diff] [blame] | 330 | |
NeilBrown | aaf68cf | 2007-02-08 14:20:30 -0800 | [diff] [blame] | 331 | spin_lock_bh(&serv->sv_lock); |
Tom Tucker | 7a18208 | 2007-12-30 21:07:53 -0600 | [diff] [blame] | 332 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) { |
Chuck Lever | e7942b9 | 2009-04-23 19:32:48 -0400 | [diff] [blame] | 333 | int onelen = svc_one_sock_name(svsk, buf + len, buflen - len); |
| 334 | if (onelen < 0) { |
| 335 | len = onelen; |
| 336 | break; |
| 337 | } |
NeilBrown | 3942302 | 2010-11-15 11:27:01 +1100 | [diff] [blame] | 338 | if (toclose && strcmp(toclose, buf + len) == 0) { |
NeilBrown | b41b66d | 2006-10-02 02:17:48 -0700 | [diff] [blame] | 339 | closesk = svsk; |
NeilBrown | 3942302 | 2010-11-15 11:27:01 +1100 | [diff] [blame] | 340 | svc_xprt_get(&closesk->sk_xprt); |
| 341 | } else |
NeilBrown | b41b66d | 2006-10-02 02:17:48 -0700 | [diff] [blame] | 342 | len += onelen; |
NeilBrown | 80212d5 | 2006-10-02 02:17:47 -0700 | [diff] [blame] | 343 | } |
NeilBrown | aaf68cf | 2007-02-08 14:20:30 -0800 | [diff] [blame] | 344 | spin_unlock_bh(&serv->sv_lock); |
Chuck Lever | e7942b9 | 2009-04-23 19:32:48 -0400 | [diff] [blame] | 345 | |
NeilBrown | 3942302 | 2010-11-15 11:27:01 +1100 | [diff] [blame] | 346 | if (closesk) { |
NeilBrown | 5680c44 | 2006-10-04 02:15:45 -0700 | [diff] [blame] | 347 | /* Should unregister with portmap, but you cannot |
| 348 | * unregister just one protocol... |
| 349 | */ |
Tom Tucker | 7a18208 | 2007-12-30 21:07:53 -0600 | [diff] [blame] | 350 | svc_close_xprt(&closesk->sk_xprt); |
NeilBrown | 3942302 | 2010-11-15 11:27:01 +1100 | [diff] [blame] | 351 | svc_xprt_put(&closesk->sk_xprt); |
| 352 | } else if (toclose) |
NeilBrown | 37a0347 | 2006-10-04 02:15:44 -0700 | [diff] [blame] | 353 | return -ENOENT; |
NeilBrown | 80212d5 | 2006-10-02 02:17:47 -0700 | [diff] [blame] | 354 | return len; |
| 355 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 356 | EXPORT_SYMBOL_GPL(svc_sock_names); |
NeilBrown | 80212d5 | 2006-10-02 02:17:47 -0700 | [diff] [blame] | 357 | |
| 358 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | * Check input queue length |
| 360 | */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 361 | static int svc_recv_available(struct svc_sock *svsk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | struct socket *sock = svsk->sk_sock; |
| 364 | int avail, err; |
| 365 | |
Sridhar Samudrala | e6242e9 | 2006-08-07 20:58:01 -0700 | [diff] [blame] | 366 | err = kernel_sock_ioctl(sock, TIOCINQ, (unsigned long) &avail); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | |
| 368 | return (err >= 0)? avail : err; |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * Generic recvfrom routine. |
| 373 | */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 374 | static int svc_recvfrom(struct svc_rqst *rqstp, struct kvec *iov, int nr, |
| 375 | int buflen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | { |
Tom Tucker | 57b1d3b | 2007-12-30 21:08:22 -0600 | [diff] [blame] | 377 | struct svc_sock *svsk = |
| 378 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
Chuck Lever | 1ba9510 | 2007-02-12 00:53:31 -0800 | [diff] [blame] | 379 | struct msghdr msg = { |
| 380 | .msg_flags = MSG_DONTWAIT, |
| 381 | }; |
| 382 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | |
Tom Tucker | 260c1d1 | 2007-12-30 21:08:29 -0600 | [diff] [blame] | 384 | rqstp->rq_xprt_hlen = 0; |
| 385 | |
Chuck Lever | 1ba9510 | 2007-02-12 00:53:31 -0800 | [diff] [blame] | 386 | len = kernel_recvmsg(svsk->sk_sock, &msg, iov, nr, buflen, |
| 387 | msg.msg_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | dprintk("svc: socket %p recvfrom(%p, %Zu) = %d\n", |
Chuck Lever | 1ba9510 | 2007-02-12 00:53:31 -0800 | [diff] [blame] | 390 | svsk, iov[0].iov_base, iov[0].iov_len, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | return len; |
| 392 | } |
| 393 | |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 394 | static int svc_partial_recvfrom(struct svc_rqst *rqstp, |
| 395 | struct kvec *iov, int nr, |
| 396 | int buflen, unsigned int base) |
| 397 | { |
| 398 | size_t save_iovlen; |
Trond Myklebust | 09acfea | 2012-03-11 15:22:54 -0400 | [diff] [blame] | 399 | void *save_iovbase; |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 400 | unsigned int i; |
| 401 | int ret; |
| 402 | |
| 403 | if (base == 0) |
| 404 | return svc_recvfrom(rqstp, iov, nr, buflen); |
| 405 | |
| 406 | for (i = 0; i < nr; i++) { |
| 407 | if (iov[i].iov_len > base) |
| 408 | break; |
| 409 | base -= iov[i].iov_len; |
| 410 | } |
| 411 | save_iovlen = iov[i].iov_len; |
| 412 | save_iovbase = iov[i].iov_base; |
| 413 | iov[i].iov_len -= base; |
| 414 | iov[i].iov_base += base; |
| 415 | ret = svc_recvfrom(rqstp, &iov[i], nr - i, buflen); |
| 416 | iov[i].iov_len = save_iovlen; |
| 417 | iov[i].iov_base = save_iovbase; |
| 418 | return ret; |
| 419 | } |
| 420 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | /* |
| 422 | * Set socket snd and rcv buffer lengths |
| 423 | */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 424 | static void svc_sock_setbufsize(struct socket *sock, unsigned int snd, |
| 425 | unsigned int rcv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | { |
| 427 | #if 0 |
| 428 | mm_segment_t oldfs; |
| 429 | oldfs = get_fs(); set_fs(KERNEL_DS); |
| 430 | sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF, |
| 431 | (char*)&snd, sizeof(snd)); |
| 432 | sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF, |
| 433 | (char*)&rcv, sizeof(rcv)); |
| 434 | #else |
| 435 | /* sock_setsockopt limits use to sysctl_?mem_max, |
| 436 | * which isn't acceptable. Until that is made conditional |
| 437 | * on not having CAP_SYS_RESOURCE or similar, we go direct... |
| 438 | * DaveM said I could! |
| 439 | */ |
| 440 | lock_sock(sock->sk); |
| 441 | sock->sk->sk_sndbuf = snd * 2; |
| 442 | sock->sk->sk_rcvbuf = rcv * 2; |
Trond Myklebust | 47fcb03 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 443 | sock->sk->sk_write_space(sock->sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | release_sock(sock->sk); |
| 445 | #endif |
| 446 | } |
| 447 | /* |
| 448 | * INET callback when data has been received on the socket. |
| 449 | */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 450 | static void svc_udp_data_ready(struct sock *sk, int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | { |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 452 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 453 | wait_queue_head_t *wq = sk_sleep(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 455 | if (svsk) { |
| 456 | dprintk("svc: socket %p(inet %p), count=%d, busy=%d\n", |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 457 | svsk, sk, count, |
| 458 | test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
| 459 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
Tom Tucker | f6150c3 | 2007-12-30 21:07:57 -0600 | [diff] [blame] | 460 | svc_xprt_enqueue(&svsk->sk_xprt); |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 461 | } |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 462 | if (wq && waitqueue_active(wq)) |
| 463 | wake_up_interruptible(wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | } |
| 465 | |
| 466 | /* |
| 467 | * INET callback when space is newly available on the socket. |
| 468 | */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 469 | static void svc_write_space(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | { |
| 471 | struct svc_sock *svsk = (struct svc_sock *)(sk->sk_user_data); |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 472 | wait_queue_head_t *wq = sk_sleep(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | |
| 474 | if (svsk) { |
| 475 | dprintk("svc: socket %p(inet %p), write_space busy=%d\n", |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 476 | svsk, sk, test_bit(XPT_BUSY, &svsk->sk_xprt.xpt_flags)); |
Tom Tucker | f6150c3 | 2007-12-30 21:07:57 -0600 | [diff] [blame] | 477 | svc_xprt_enqueue(&svsk->sk_xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | } |
| 479 | |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 480 | if (wq && waitqueue_active(wq)) { |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 481 | dprintk("RPC svc_write_space: someone sleeping on %p\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | svsk); |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 483 | wake_up_interruptible(wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | } |
| 485 | } |
| 486 | |
Trond Myklebust | 47fcb03 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 487 | static void svc_tcp_write_space(struct sock *sk) |
| 488 | { |
| 489 | struct socket *sock = sk->sk_socket; |
| 490 | |
| 491 | if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) && sock) |
| 492 | clear_bit(SOCK_NOSPACE, &sock->flags); |
| 493 | svc_write_space(sk); |
| 494 | } |
| 495 | |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 496 | /* |
Chuck Lever | 7702ce4 | 2009-07-13 10:54:26 -0400 | [diff] [blame] | 497 | * See net/ipv6/ip_sockglue.c : ip_cmsg_recv_pktinfo |
| 498 | */ |
| 499 | static int svc_udp_get_dest_address4(struct svc_rqst *rqstp, |
| 500 | struct cmsghdr *cmh) |
| 501 | { |
| 502 | struct in_pktinfo *pki = CMSG_DATA(cmh); |
Mi Jinlong | 849a1cf | 2011-08-30 17:18:41 +0800 | [diff] [blame] | 503 | struct sockaddr_in *daddr = svc_daddr_in(rqstp); |
| 504 | |
Chuck Lever | 7702ce4 | 2009-07-13 10:54:26 -0400 | [diff] [blame] | 505 | if (cmh->cmsg_type != IP_PKTINFO) |
| 506 | return 0; |
Mi Jinlong | 849a1cf | 2011-08-30 17:18:41 +0800 | [diff] [blame] | 507 | |
| 508 | daddr->sin_family = AF_INET; |
| 509 | daddr->sin_addr.s_addr = pki->ipi_spec_dst.s_addr; |
Chuck Lever | 7702ce4 | 2009-07-13 10:54:26 -0400 | [diff] [blame] | 510 | return 1; |
| 511 | } |
| 512 | |
| 513 | /* |
| 514 | * See net/ipv6/datagram.c : datagram_recv_ctl |
| 515 | */ |
| 516 | static int svc_udp_get_dest_address6(struct svc_rqst *rqstp, |
| 517 | struct cmsghdr *cmh) |
| 518 | { |
| 519 | struct in6_pktinfo *pki = CMSG_DATA(cmh); |
Mi Jinlong | 849a1cf | 2011-08-30 17:18:41 +0800 | [diff] [blame] | 520 | struct sockaddr_in6 *daddr = svc_daddr_in6(rqstp); |
| 521 | |
Chuck Lever | 7702ce4 | 2009-07-13 10:54:26 -0400 | [diff] [blame] | 522 | if (cmh->cmsg_type != IPV6_PKTINFO) |
| 523 | return 0; |
Mi Jinlong | 849a1cf | 2011-08-30 17:18:41 +0800 | [diff] [blame] | 524 | |
| 525 | daddr->sin6_family = AF_INET6; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 526 | daddr->sin6_addr = pki->ipi6_addr; |
Mi Jinlong | 849a1cf | 2011-08-30 17:18:41 +0800 | [diff] [blame] | 527 | daddr->sin6_scope_id = pki->ipi6_ifindex; |
Chuck Lever | 7702ce4 | 2009-07-13 10:54:26 -0400 | [diff] [blame] | 528 | return 1; |
| 529 | } |
| 530 | |
| 531 | /* |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 532 | * Copy the UDP datagram's destination address to the rqstp structure. |
| 533 | * The 'destination' address in this case is the address to which the |
| 534 | * peer sent the datagram, i.e. our local address. For multihomed |
| 535 | * hosts, this can change from msg to msg. Note that only the IP |
| 536 | * address changes, the port number should remain the same. |
| 537 | */ |
Chuck Lever | 7702ce4 | 2009-07-13 10:54:26 -0400 | [diff] [blame] | 538 | static int svc_udp_get_dest_address(struct svc_rqst *rqstp, |
| 539 | struct cmsghdr *cmh) |
Chuck Lever | 9575648 | 2007-02-12 00:53:38 -0800 | [diff] [blame] | 540 | { |
Chuck Lever | 7702ce4 | 2009-07-13 10:54:26 -0400 | [diff] [blame] | 541 | switch (cmh->cmsg_level) { |
| 542 | case SOL_IP: |
| 543 | return svc_udp_get_dest_address4(rqstp, cmh); |
| 544 | case SOL_IPV6: |
| 545 | return svc_udp_get_dest_address6(rqstp, cmh); |
Chuck Lever | 9575648 | 2007-02-12 00:53:38 -0800 | [diff] [blame] | 546 | } |
Chuck Lever | 7702ce4 | 2009-07-13 10:54:26 -0400 | [diff] [blame] | 547 | |
| 548 | return 0; |
Chuck Lever | 9575648 | 2007-02-12 00:53:38 -0800 | [diff] [blame] | 549 | } |
| 550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | /* |
| 552 | * Receive a datagram from a UDP socket. |
| 553 | */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 554 | static int svc_udp_recvfrom(struct svc_rqst *rqstp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | { |
Tom Tucker | 57b1d3b | 2007-12-30 21:08:22 -0600 | [diff] [blame] | 556 | struct svc_sock *svsk = |
| 557 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
Tom Tucker | bb5cf16 | 2007-12-30 21:07:50 -0600 | [diff] [blame] | 558 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | struct sk_buff *skb; |
David S. Miller | bc375ea | 2007-04-12 13:35:59 -0700 | [diff] [blame] | 560 | union { |
| 561 | struct cmsghdr hdr; |
| 562 | long all[SVC_PKTINFO_SPACE / sizeof(long)]; |
| 563 | } buffer; |
| 564 | struct cmsghdr *cmh = &buffer.hdr; |
NeilBrown | 7a37f57 | 2007-03-06 01:42:21 -0800 | [diff] [blame] | 565 | struct msghdr msg = { |
| 566 | .msg_name = svc_addr(rqstp), |
| 567 | .msg_control = cmh, |
| 568 | .msg_controllen = sizeof(buffer), |
| 569 | .msg_flags = MSG_DONTWAIT, |
| 570 | }; |
Chuck Lever | abc5c44 | 2009-04-23 19:31:25 -0400 | [diff] [blame] | 571 | size_t len; |
| 572 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 574 | if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | /* udp sockets need large rcvbuf as all pending |
| 576 | * requests are still in that buffer. sndbuf must |
| 577 | * also be large enough that there is enough space |
Greg Banks | 3262c81 | 2006-10-02 02:17:58 -0700 | [diff] [blame] | 578 | * for one reply per thread. We count all threads |
| 579 | * rather than threads in a particular pool, which |
| 580 | * provides an upper bound on the number of threads |
| 581 | * which will access the socket. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | */ |
| 583 | svc_sock_setbufsize(svsk->sk_sock, |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 584 | (serv->sv_nrthreads+3) * serv->sv_max_mesg, |
| 585 | (serv->sv_nrthreads+3) * serv->sv_max_mesg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 587 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
NeilBrown | 05ed690 | 2007-05-09 02:34:55 -0700 | [diff] [blame] | 588 | skb = NULL; |
| 589 | err = kernel_recvmsg(svsk->sk_sock, &msg, NULL, |
| 590 | 0, 0, MSG_PEEK | MSG_DONTWAIT); |
| 591 | if (err >= 0) |
| 592 | skb = skb_recv_datagram(svsk->sk_sk, 0, 1, &err); |
| 593 | |
| 594 | if (skb == NULL) { |
| 595 | if (err != -EAGAIN) { |
| 596 | /* possibly an icmp error */ |
| 597 | dprintk("svc: recvfrom returned error %d\n", -err); |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 598 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | } |
NeilBrown | 05ed690 | 2007-05-09 02:34:55 -0700 | [diff] [blame] | 600 | return -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | } |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 602 | len = svc_addr_len(svc_addr(rqstp)); |
Chuck Lever | abc5c44 | 2009-04-23 19:31:25 -0400 | [diff] [blame] | 603 | if (len == 0) |
| 604 | return -EAFNOSUPPORT; |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 605 | rqstp->rq_addrlen = len; |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 606 | if (skb->tstamp.tv64 == 0) { |
| 607 | skb->tstamp = ktime_get_real(); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 608 | /* Don't enable netstamp, sunrpc doesn't |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | need that much accuracy */ |
| 610 | } |
Eric Dumazet | b7aa0bf | 2007-04-19 16:16:32 -0700 | [diff] [blame] | 611 | svsk->sk_sk->sk_stamp = skb->tstamp; |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 612 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); /* there may be more data... */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | len = skb->len - sizeof(struct udphdr); |
| 615 | rqstp->rq_arg.len = len; |
| 616 | |
Chuck Lever | 9575648 | 2007-02-12 00:53:38 -0800 | [diff] [blame] | 617 | rqstp->rq_prot = IPPROTO_UDP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
Chuck Lever | 7702ce4 | 2009-07-13 10:54:26 -0400 | [diff] [blame] | 619 | if (!svc_udp_get_dest_address(rqstp, cmh)) { |
NeilBrown | 7a37f57 | 2007-03-06 01:42:21 -0800 | [diff] [blame] | 620 | if (net_ratelimit()) |
Chuck Lever | 7702ce4 | 2009-07-13 10:54:26 -0400 | [diff] [blame] | 621 | printk(KERN_WARNING |
| 622 | "svc: received unknown control message %d/%d; " |
| 623 | "dropping RPC reply datagram\n", |
| 624 | cmh->cmsg_level, cmh->cmsg_type); |
Eric Dumazet | 9d410c7 | 2009-10-30 05:03:53 +0000 | [diff] [blame] | 625 | skb_free_datagram_locked(svsk->sk_sk, skb); |
NeilBrown | 7a37f57 | 2007-03-06 01:42:21 -0800 | [diff] [blame] | 626 | return 0; |
| 627 | } |
Mi Jinlong | 849a1cf | 2011-08-30 17:18:41 +0800 | [diff] [blame] | 628 | rqstp->rq_daddrlen = svc_addr_len(svc_daddr(rqstp)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
| 630 | if (skb_is_nonlinear(skb)) { |
| 631 | /* we have to copy */ |
| 632 | local_bh_disable(); |
| 633 | if (csum_partial_copy_to_xdr(&rqstp->rq_arg, skb)) { |
| 634 | local_bh_enable(); |
| 635 | /* checksum error */ |
Eric Dumazet | 9d410c7 | 2009-10-30 05:03:53 +0000 | [diff] [blame] | 636 | skb_free_datagram_locked(svsk->sk_sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | return 0; |
| 638 | } |
| 639 | local_bh_enable(); |
Eric Dumazet | 9d410c7 | 2009-10-30 05:03:53 +0000 | [diff] [blame] | 640 | skb_free_datagram_locked(svsk->sk_sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | } else { |
| 642 | /* we can use it in-place */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 643 | rqstp->rq_arg.head[0].iov_base = skb->data + |
| 644 | sizeof(struct udphdr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | rqstp->rq_arg.head[0].iov_len = len; |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 646 | if (skb_checksum_complete(skb)) { |
Eric Dumazet | 9d410c7 | 2009-10-30 05:03:53 +0000 | [diff] [blame] | 647 | skb_free_datagram_locked(svsk->sk_sk, skb); |
Herbert Xu | fb286bb | 2005-11-10 13:01:24 -0800 | [diff] [blame] | 648 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | } |
Tom Tucker | 5148bf4 | 2007-12-30 21:07:25 -0600 | [diff] [blame] | 650 | rqstp->rq_xprt_ctxt = skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | } |
| 652 | |
| 653 | rqstp->rq_arg.page_base = 0; |
| 654 | if (len <= rqstp->rq_arg.head[0].iov_len) { |
| 655 | rqstp->rq_arg.head[0].iov_len = len; |
| 656 | rqstp->rq_arg.page_len = 0; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 657 | rqstp->rq_respages = rqstp->rq_pages+1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | } else { |
| 659 | rqstp->rq_arg.page_len = len - rqstp->rq_arg.head[0].iov_len; |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 660 | rqstp->rq_respages = rqstp->rq_pages + 1 + |
Ilpo Järvinen | 172589c | 2007-08-28 15:50:33 -0700 | [diff] [blame] | 661 | DIV_ROUND_UP(rqstp->rq_arg.page_len, PAGE_SIZE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | } |
| 663 | |
| 664 | if (serv->sv_stats) |
| 665 | serv->sv_stats->netudpcnt++; |
| 666 | |
| 667 | return len; |
| 668 | } |
| 669 | |
| 670 | static int |
| 671 | svc_udp_sendto(struct svc_rqst *rqstp) |
| 672 | { |
| 673 | int error; |
| 674 | |
| 675 | error = svc_sendto(rqstp, &rqstp->rq_res); |
| 676 | if (error == -ECONNREFUSED) |
| 677 | /* ICMP error on earlier request. */ |
| 678 | error = svc_sendto(rqstp, &rqstp->rq_res); |
| 679 | |
| 680 | return error; |
| 681 | } |
| 682 | |
Tom Tucker | e831fe6 | 2007-12-30 21:07:29 -0600 | [diff] [blame] | 683 | static void svc_udp_prep_reply_hdr(struct svc_rqst *rqstp) |
| 684 | { |
| 685 | } |
| 686 | |
Tom Tucker | 323bee3 | 2007-12-30 21:07:31 -0600 | [diff] [blame] | 687 | static int svc_udp_has_wspace(struct svc_xprt *xprt) |
| 688 | { |
| 689 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
Tom Tucker | bb5cf16 | 2007-12-30 21:07:50 -0600 | [diff] [blame] | 690 | struct svc_serv *serv = xprt->xpt_server; |
Tom Tucker | 323bee3 | 2007-12-30 21:07:31 -0600 | [diff] [blame] | 691 | unsigned long required; |
| 692 | |
| 693 | /* |
| 694 | * Set the SOCK_NOSPACE flag before checking the available |
| 695 | * sock space. |
| 696 | */ |
| 697 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
Tom Tucker | 7a90e8c | 2007-12-30 21:07:55 -0600 | [diff] [blame] | 698 | required = atomic_read(&svsk->sk_xprt.xpt_reserved) + serv->sv_max_mesg; |
Tom Tucker | 323bee3 | 2007-12-30 21:07:31 -0600 | [diff] [blame] | 699 | if (required*2 > sock_wspace(svsk->sk_sk)) |
| 700 | return 0; |
| 701 | clear_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
| 702 | return 1; |
| 703 | } |
| 704 | |
Tom Tucker | 38a417c | 2007-12-30 21:07:36 -0600 | [diff] [blame] | 705 | static struct svc_xprt *svc_udp_accept(struct svc_xprt *xprt) |
| 706 | { |
| 707 | BUG(); |
| 708 | return NULL; |
| 709 | } |
| 710 | |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 711 | static struct svc_xprt *svc_udp_create(struct svc_serv *serv, |
Pavel Emelyanov | 62832c0 | 2010-09-29 16:04:18 +0400 | [diff] [blame] | 712 | struct net *net, |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 713 | struct sockaddr *sa, int salen, |
| 714 | int flags) |
| 715 | { |
Pavel Emelyanov | 62832c0 | 2010-09-29 16:04:18 +0400 | [diff] [blame] | 716 | return svc_create_socket(serv, IPPROTO_UDP, net, sa, salen, flags); |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 717 | } |
| 718 | |
Tom Tucker | 360d873 | 2007-12-30 21:07:17 -0600 | [diff] [blame] | 719 | static struct svc_xprt_ops svc_udp_ops = { |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 720 | .xpo_create = svc_udp_create, |
Tom Tucker | 5d13799 | 2007-12-30 21:07:23 -0600 | [diff] [blame] | 721 | .xpo_recvfrom = svc_udp_recvfrom, |
| 722 | .xpo_sendto = svc_udp_sendto, |
Tom Tucker | 5148bf4 | 2007-12-30 21:07:25 -0600 | [diff] [blame] | 723 | .xpo_release_rqst = svc_release_skb, |
Tom Tucker | 755ccea | 2007-12-30 21:07:27 -0600 | [diff] [blame] | 724 | .xpo_detach = svc_sock_detach, |
| 725 | .xpo_free = svc_sock_free, |
Tom Tucker | e831fe6 | 2007-12-30 21:07:29 -0600 | [diff] [blame] | 726 | .xpo_prep_reply_hdr = svc_udp_prep_reply_hdr, |
Tom Tucker | 323bee3 | 2007-12-30 21:07:31 -0600 | [diff] [blame] | 727 | .xpo_has_wspace = svc_udp_has_wspace, |
Tom Tucker | 38a417c | 2007-12-30 21:07:36 -0600 | [diff] [blame] | 728 | .xpo_accept = svc_udp_accept, |
Tom Tucker | 360d873 | 2007-12-30 21:07:17 -0600 | [diff] [blame] | 729 | }; |
| 730 | |
| 731 | static struct svc_xprt_class svc_udp_class = { |
| 732 | .xcl_name = "udp", |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 733 | .xcl_owner = THIS_MODULE, |
Tom Tucker | 360d873 | 2007-12-30 21:07:17 -0600 | [diff] [blame] | 734 | .xcl_ops = &svc_udp_ops, |
Tom Tucker | 4902315 | 2007-12-30 21:07:21 -0600 | [diff] [blame] | 735 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_UDP, |
Tom Tucker | 360d873 | 2007-12-30 21:07:17 -0600 | [diff] [blame] | 736 | }; |
| 737 | |
Tom Tucker | bb5cf16 | 2007-12-30 21:07:50 -0600 | [diff] [blame] | 738 | static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | { |
Chuck Lever | 7702ce4 | 2009-07-13 10:54:26 -0400 | [diff] [blame] | 740 | int err, level, optname, one = 1; |
NeilBrown | 7a37f57 | 2007-03-06 01:42:21 -0800 | [diff] [blame] | 741 | |
Stanislav Kinsbursky | bd4620d | 2011-12-06 14:19:10 +0300 | [diff] [blame] | 742 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class, |
| 743 | &svsk->sk_xprt, serv); |
Tom Tucker | def13d7 | 2007-12-30 21:08:08 -0600 | [diff] [blame] | 744 | clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | svsk->sk_sk->sk_data_ready = svc_udp_data_ready; |
| 746 | svsk->sk_sk->sk_write_space = svc_write_space; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | |
| 748 | /* initialise setting must have enough space to |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 749 | * receive and respond to one request. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | * svc_udp_recvfrom will re-adjust if necessary |
| 751 | */ |
| 752 | svc_sock_setbufsize(svsk->sk_sock, |
Tom Tucker | bb5cf16 | 2007-12-30 21:07:50 -0600 | [diff] [blame] | 753 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg, |
| 754 | 3 * svsk->sk_xprt.xpt_server->sv_max_mesg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 756 | /* data might have come in before data_ready set up */ |
| 757 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 758 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
NeilBrown | 7a37f57 | 2007-03-06 01:42:21 -0800 | [diff] [blame] | 759 | |
NeilBrown | 7a37f57 | 2007-03-06 01:42:21 -0800 | [diff] [blame] | 760 | /* make sure we get destination address info */ |
Chuck Lever | 7702ce4 | 2009-07-13 10:54:26 -0400 | [diff] [blame] | 761 | switch (svsk->sk_sk->sk_family) { |
| 762 | case AF_INET: |
| 763 | level = SOL_IP; |
| 764 | optname = IP_PKTINFO; |
| 765 | break; |
| 766 | case AF_INET6: |
| 767 | level = SOL_IPV6; |
| 768 | optname = IPV6_RECVPKTINFO; |
| 769 | break; |
| 770 | default: |
| 771 | BUG(); |
| 772 | } |
| 773 | err = kernel_setsockopt(svsk->sk_sock, level, optname, |
| 774 | (char *)&one, sizeof(one)); |
| 775 | dprintk("svc: kernel_setsockopt returned %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | } |
| 777 | |
| 778 | /* |
| 779 | * A data_ready event on a listening socket means there's a connection |
| 780 | * pending. Do not use state_change as a substitute for it. |
| 781 | */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 782 | static void svc_tcp_listen_data_ready(struct sock *sk, int count_unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | { |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 784 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 785 | wait_queue_head_t *wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | |
| 787 | dprintk("svc: socket %p TCP (listen) state change %d\n", |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 788 | sk, sk->sk_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 790 | /* |
| 791 | * This callback may called twice when a new connection |
| 792 | * is established as a child socket inherits everything |
| 793 | * from a parent LISTEN socket. |
| 794 | * 1) data_ready method of the parent socket will be called |
| 795 | * when one of child sockets become ESTABLISHED. |
| 796 | * 2) data_ready method of the child socket may be called |
| 797 | * when it receives data before the socket is accepted. |
| 798 | * In case of 2, we should ignore it silently. |
| 799 | */ |
| 800 | if (sk->sk_state == TCP_LISTEN) { |
| 801 | if (svsk) { |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 802 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
Tom Tucker | f6150c3 | 2007-12-30 21:07:57 -0600 | [diff] [blame] | 803 | svc_xprt_enqueue(&svsk->sk_xprt); |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 804 | } else |
| 805 | printk("svc: socket %p: no user data\n", sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | } |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 807 | |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 808 | wq = sk_sleep(sk); |
| 809 | if (wq && waitqueue_active(wq)) |
| 810 | wake_up_interruptible_all(wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | } |
| 812 | |
| 813 | /* |
| 814 | * A state change on a connected socket means it's dying or dead. |
| 815 | */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 816 | static void svc_tcp_state_change(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 817 | { |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 818 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 819 | wait_queue_head_t *wq = sk_sleep(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
| 821 | dprintk("svc: socket %p TCP (connected) state change %d (svsk %p)\n", |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 822 | sk, sk->sk_state, sk->sk_user_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 824 | if (!svsk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | printk("svc: socket %p: no user data\n", sk); |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 826 | else { |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 827 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
Tom Tucker | f6150c3 | 2007-12-30 21:07:57 -0600 | [diff] [blame] | 828 | svc_xprt_enqueue(&svsk->sk_xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | } |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 830 | if (wq && waitqueue_active(wq)) |
| 831 | wake_up_interruptible_all(wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | } |
| 833 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 834 | static void svc_tcp_data_ready(struct sock *sk, int count) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | { |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 836 | struct svc_sock *svsk = (struct svc_sock *)sk->sk_user_data; |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 837 | wait_queue_head_t *wq = sk_sleep(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | |
| 839 | dprintk("svc: socket %p TCP data ready (svsk %p)\n", |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 840 | sk, sk->sk_user_data); |
| 841 | if (svsk) { |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 842 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
Tom Tucker | f6150c3 | 2007-12-30 21:07:57 -0600 | [diff] [blame] | 843 | svc_xprt_enqueue(&svsk->sk_xprt); |
Neil Brown | 939bb7e | 2005-09-13 01:25:39 -0700 | [diff] [blame] | 844 | } |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 845 | if (wq && waitqueue_active(wq)) |
| 846 | wake_up_interruptible(wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 847 | } |
| 848 | |
| 849 | /* |
| 850 | * Accept a TCP connection |
| 851 | */ |
Tom Tucker | 38a417c | 2007-12-30 21:07:36 -0600 | [diff] [blame] | 852 | static struct svc_xprt *svc_tcp_accept(struct svc_xprt *xprt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 853 | { |
Tom Tucker | 38a417c | 2007-12-30 21:07:36 -0600 | [diff] [blame] | 854 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
akpm@linux-foundation.org | cdd88b9 | 2007-02-12 00:53:38 -0800 | [diff] [blame] | 855 | struct sockaddr_storage addr; |
| 856 | struct sockaddr *sin = (struct sockaddr *) &addr; |
Tom Tucker | bb5cf16 | 2007-12-30 21:07:50 -0600 | [diff] [blame] | 857 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | struct socket *sock = svsk->sk_sock; |
| 859 | struct socket *newsock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | struct svc_sock *newsvsk; |
| 861 | int err, slen; |
Pavel Emelyanov | 5216a8e | 2008-02-21 10:57:45 +0300 | [diff] [blame] | 862 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
| 864 | dprintk("svc: tcp_accept %p sock %p\n", svsk, sock); |
| 865 | if (!sock) |
Tom Tucker | 38a417c | 2007-12-30 21:07:36 -0600 | [diff] [blame] | 866 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 868 | clear_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
Sridhar Samudrala | e6242e9 | 2006-08-07 20:58:01 -0700 | [diff] [blame] | 869 | err = kernel_accept(sock, &newsock, O_NONBLOCK); |
| 870 | if (err < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | if (err == -ENOMEM) |
| 872 | printk(KERN_WARNING "%s: no more sockets!\n", |
| 873 | serv->sv_name); |
Sridhar Samudrala | e6242e9 | 2006-08-07 20:58:01 -0700 | [diff] [blame] | 874 | else if (err != -EAGAIN && net_ratelimit()) |
| 875 | printk(KERN_WARNING "%s: accept failed (err %d)!\n", |
| 876 | serv->sv_name, -err); |
Tom Tucker | 38a417c | 2007-12-30 21:07:36 -0600 | [diff] [blame] | 877 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | } |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 879 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | |
akpm@linux-foundation.org | cdd88b9 | 2007-02-12 00:53:38 -0800 | [diff] [blame] | 881 | err = kernel_getpeername(newsock, sin, &slen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | if (err < 0) { |
| 883 | if (net_ratelimit()) |
| 884 | printk(KERN_WARNING "%s: peername failed (err %d)!\n", |
| 885 | serv->sv_name, -err); |
| 886 | goto failed; /* aborted connection or whatever */ |
| 887 | } |
| 888 | |
| 889 | /* Ideally, we would want to reject connections from unauthorized |
Chuck Lever | ad06e4b | 2007-02-12 00:53:32 -0800 | [diff] [blame] | 890 | * hosts here, but when we get encryption, the IP of the host won't |
| 891 | * tell us anything. For now just warn about unpriv connections. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | */ |
akpm@linux-foundation.org | cdd88b9 | 2007-02-12 00:53:38 -0800 | [diff] [blame] | 893 | if (!svc_port_is_privileged(sin)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | dprintk(KERN_WARNING |
Chuck Lever | ad06e4b | 2007-02-12 00:53:32 -0800 | [diff] [blame] | 895 | "%s: connect from unprivileged port: %s\n", |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 896 | serv->sv_name, |
akpm@linux-foundation.org | cdd88b9 | 2007-02-12 00:53:38 -0800 | [diff] [blame] | 897 | __svc_print_addr(sin, buf, sizeof(buf))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | } |
Chuck Lever | ad06e4b | 2007-02-12 00:53:32 -0800 | [diff] [blame] | 899 | dprintk("%s: connect from %s\n", serv->sv_name, |
akpm@linux-foundation.org | cdd88b9 | 2007-02-12 00:53:38 -0800 | [diff] [blame] | 900 | __svc_print_addr(sin, buf, sizeof(buf))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | |
| 902 | /* make sure that a write doesn't block forever when |
| 903 | * low on memory |
| 904 | */ |
| 905 | newsock->sk->sk_sndtimeo = HZ*30; |
| 906 | |
Chuck Lever | 6b17433 | 2007-02-12 00:53:28 -0800 | [diff] [blame] | 907 | if (!(newsvsk = svc_setup_socket(serv, newsock, &err, |
| 908 | (SVC_SOCK_ANONYMOUS | SVC_SOCK_TEMPORARY)))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | goto failed; |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 910 | svc_xprt_set_remote(&newsvsk->sk_xprt, sin, slen); |
Frank van Maarseveen | a974769 | 2007-07-09 22:21:39 +0200 | [diff] [blame] | 911 | err = kernel_getsockname(newsock, sin, &slen); |
| 912 | if (unlikely(err < 0)) { |
| 913 | dprintk("svc_tcp_accept: kernel_getsockname error %d\n", -err); |
| 914 | slen = offsetof(struct sockaddr, sa_data); |
| 915 | } |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 916 | svc_xprt_set_local(&newsvsk->sk_xprt, sin, slen); |
Chuck Lever | 067d781 | 2007-02-12 00:53:30 -0800 | [diff] [blame] | 917 | |
Tom Tucker | f9f3cc4 | 2007-12-30 21:07:40 -0600 | [diff] [blame] | 918 | if (serv->sv_stats) |
| 919 | serv->sv_stats->nettcpconn++; |
| 920 | |
| 921 | return &newsvsk->sk_xprt; |
| 922 | |
| 923 | failed: |
| 924 | sock_release(newsock); |
| 925 | return NULL; |
| 926 | } |
| 927 | |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 928 | static unsigned int svc_tcp_restore_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
| 929 | { |
| 930 | unsigned int i, len, npages; |
| 931 | |
| 932 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) |
| 933 | return 0; |
| 934 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); |
| 935 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 936 | for (i = 0; i < npages; i++) { |
| 937 | if (rqstp->rq_pages[i] != NULL) |
| 938 | put_page(rqstp->rq_pages[i]); |
| 939 | BUG_ON(svsk->sk_pages[i] == NULL); |
| 940 | rqstp->rq_pages[i] = svsk->sk_pages[i]; |
| 941 | svsk->sk_pages[i] = NULL; |
| 942 | } |
| 943 | rqstp->rq_arg.head[0].iov_base = page_address(rqstp->rq_pages[0]); |
| 944 | return len; |
| 945 | } |
| 946 | |
| 947 | static void svc_tcp_save_pages(struct svc_sock *svsk, struct svc_rqst *rqstp) |
| 948 | { |
| 949 | unsigned int i, len, npages; |
| 950 | |
| 951 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) |
| 952 | return; |
| 953 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); |
| 954 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 955 | for (i = 0; i < npages; i++) { |
| 956 | svsk->sk_pages[i] = rqstp->rq_pages[i]; |
| 957 | rqstp->rq_pages[i] = NULL; |
| 958 | } |
| 959 | } |
| 960 | |
| 961 | static void svc_tcp_clear_pages(struct svc_sock *svsk) |
| 962 | { |
| 963 | unsigned int i, len, npages; |
| 964 | |
| 965 | if (svsk->sk_tcplen <= sizeof(rpc_fraghdr)) |
| 966 | goto out; |
| 967 | len = svsk->sk_tcplen - sizeof(rpc_fraghdr); |
| 968 | npages = (len + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 969 | for (i = 0; i < npages; i++) { |
| 970 | BUG_ON(svsk->sk_pages[i] == NULL); |
| 971 | put_page(svsk->sk_pages[i]); |
| 972 | svsk->sk_pages[i] = NULL; |
| 973 | } |
| 974 | out: |
| 975 | svsk->sk_tcplen = 0; |
| 976 | } |
| 977 | |
Tom Tucker | f9f3cc4 | 2007-12-30 21:07:40 -0600 | [diff] [blame] | 978 | /* |
Alexandros Batsakis | 8f55f3c | 2009-08-20 03:34:19 +0300 | [diff] [blame] | 979 | * Receive data. |
| 980 | * If we haven't gotten the record length yet, get the next four bytes. |
| 981 | * Otherwise try to gobble up as much as possible up to the complete |
| 982 | * record length. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | */ |
Alexandros Batsakis | 8f55f3c | 2009-08-20 03:34:19 +0300 | [diff] [blame] | 984 | static int svc_tcp_recv_record(struct svc_sock *svsk, struct svc_rqst *rqstp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | { |
Tom Tucker | bb5cf16 | 2007-12-30 21:07:50 -0600 | [diff] [blame] | 986 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
Trond Myklebust | 5ee78d4 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 987 | unsigned int want; |
Alexandros Batsakis | 8f55f3c | 2009-08-20 03:34:19 +0300 | [diff] [blame] | 988 | int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 990 | clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | |
Chuck Lever | c0401ea | 2008-04-14 12:27:30 -0400 | [diff] [blame] | 992 | if (svsk->sk_tcplen < sizeof(rpc_fraghdr)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | struct kvec iov; |
| 994 | |
Trond Myklebust | 5ee78d4 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 995 | want = sizeof(rpc_fraghdr) - svsk->sk_tcplen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | iov.iov_base = ((char *) &svsk->sk_reclen) + svsk->sk_tcplen; |
| 997 | iov.iov_len = want; |
| 998 | if ((len = svc_recvfrom(rqstp, &iov, 1, want)) < 0) |
| 999 | goto error; |
| 1000 | svsk->sk_tcplen += len; |
| 1001 | |
| 1002 | if (len < want) { |
Chuck Lever | c0401ea | 2008-04-14 12:27:30 -0400 | [diff] [blame] | 1003 | dprintk("svc: short recvfrom while reading record " |
| 1004 | "length (%d of %d)\n", len, want); |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 1005 | return -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | } |
| 1007 | |
| 1008 | svsk->sk_reclen = ntohl(svsk->sk_reclen); |
Chuck Lever | c0401ea | 2008-04-14 12:27:30 -0400 | [diff] [blame] | 1009 | if (!(svsk->sk_reclen & RPC_LAST_STREAM_FRAGMENT)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | /* FIXME: technically, a record can be fragmented, |
| 1011 | * and non-terminal fragments will not have the top |
| 1012 | * bit set in the fragment length header. |
| 1013 | * But apparently no known nfs clients send fragmented |
| 1014 | * records. */ |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1015 | if (net_ratelimit()) |
Chuck Lever | c0401ea | 2008-04-14 12:27:30 -0400 | [diff] [blame] | 1016 | printk(KERN_NOTICE "RPC: multiple fragments " |
| 1017 | "per record not supported\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | goto err_delete; |
| 1019 | } |
Alexandros Batsakis | 8f55f3c | 2009-08-20 03:34:19 +0300 | [diff] [blame] | 1020 | |
Chuck Lever | c0401ea | 2008-04-14 12:27:30 -0400 | [diff] [blame] | 1021 | svsk->sk_reclen &= RPC_FRAGMENT_SIZE_MASK; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | dprintk("svc: TCP record, %d bytes\n", svsk->sk_reclen); |
NeilBrown | c6b0a9f | 2006-10-06 00:44:05 -0700 | [diff] [blame] | 1023 | if (svsk->sk_reclen > serv->sv_max_mesg) { |
NeilBrown | 34e9a63 | 2007-01-29 13:19:52 -0800 | [diff] [blame] | 1024 | if (net_ratelimit()) |
Chuck Lever | c0401ea | 2008-04-14 12:27:30 -0400 | [diff] [blame] | 1025 | printk(KERN_NOTICE "RPC: " |
| 1026 | "fragment too large: 0x%08lx\n", |
| 1027 | (unsigned long)svsk->sk_reclen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | goto err_delete; |
| 1029 | } |
| 1030 | } |
| 1031 | |
J. Bruce Fields | cc6c212 | 2011-02-14 15:03:35 -0500 | [diff] [blame] | 1032 | if (svsk->sk_reclen < 8) |
| 1033 | goto err_delete; /* client is nuts. */ |
| 1034 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | len = svsk->sk_reclen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | |
Alexandros Batsakis | 8f55f3c | 2009-08-20 03:34:19 +0300 | [diff] [blame] | 1037 | return len; |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 1038 | error: |
| 1039 | dprintk("RPC: TCP recv_record got %d\n", len); |
Alexandros Batsakis | 8f55f3c | 2009-08-20 03:34:19 +0300 | [diff] [blame] | 1040 | return len; |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 1041 | err_delete: |
Alexandros Batsakis | 8f55f3c | 2009-08-20 03:34:19 +0300 | [diff] [blame] | 1042 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
Alexandros Batsakis | 8f55f3c | 2009-08-20 03:34:19 +0300 | [diff] [blame] | 1043 | return -EAGAIN; |
| 1044 | } |
| 1045 | |
Trond Myklebust | 586c52c | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1046 | static int receive_cb_reply(struct svc_sock *svsk, struct svc_rqst *rqstp) |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 1047 | { |
Trond Myklebust | 586c52c | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1048 | struct rpc_xprt *bc_xprt = svsk->sk_xprt.xpt_bc_xprt; |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 1049 | struct rpc_rqst *req = NULL; |
Trond Myklebust | 586c52c | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1050 | struct kvec *src, *dst; |
| 1051 | __be32 *p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
J. Bruce Fields | 48e6555 | 2011-02-14 14:52:03 -0500 | [diff] [blame] | 1052 | __be32 xid; |
| 1053 | __be32 calldir; |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 1054 | |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 1055 | xid = *p++; |
| 1056 | calldir = *p; |
| 1057 | |
Trond Myklebust | 586c52c | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1058 | if (bc_xprt) |
| 1059 | req = xprt_lookup_rqst(bc_xprt, xid); |
J. Bruce Fields | d75faea | 2010-11-30 19:15:01 -0500 | [diff] [blame] | 1060 | |
Trond Myklebust | 586c52c | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1061 | if (!req) { |
| 1062 | printk(KERN_NOTICE |
| 1063 | "%s: Got unrecognized reply: " |
| 1064 | "calldir 0x%x xpt_bc_xprt %p xid %08x\n", |
| 1065 | __func__, ntohl(calldir), |
| 1066 | bc_xprt, xid); |
| 1067 | return -EAGAIN; |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 1068 | } |
Trond Myklebust | 586c52c | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1069 | |
| 1070 | memcpy(&req->rq_private_buf, &req->rq_rcv_buf, sizeof(struct xdr_buf)); |
| 1071 | /* |
| 1072 | * XXX!: cheating for now! Only copying HEAD. |
| 1073 | * But we know this is good enough for now (in fact, for any |
| 1074 | * callback reply in the forseeable future). |
| 1075 | */ |
| 1076 | dst = &req->rq_private_buf.head[0]; |
| 1077 | src = &rqstp->rq_arg.head[0]; |
| 1078 | if (dst->iov_len < src->iov_len) |
| 1079 | return -EAGAIN; /* whatever; just giving up. */ |
| 1080 | memcpy(dst->iov_base, src->iov_base, src->iov_len); |
| 1081 | xprt_complete_rqst(req->rq_task, svsk->sk_reclen); |
| 1082 | rqstp->rq_arg.len = 0; |
| 1083 | return 0; |
| 1084 | } |
| 1085 | |
| 1086 | static int copy_pages_to_kvecs(struct kvec *vec, struct page **pages, int len) |
| 1087 | { |
| 1088 | int i = 0; |
| 1089 | int t = 0; |
| 1090 | |
| 1091 | while (t < len) { |
| 1092 | vec[i].iov_base = page_address(pages[i]); |
| 1093 | vec[i].iov_len = PAGE_SIZE; |
| 1094 | i++; |
| 1095 | t += PAGE_SIZE; |
| 1096 | } |
| 1097 | return i; |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 1098 | } |
| 1099 | |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 1100 | |
Alexandros Batsakis | 8f55f3c | 2009-08-20 03:34:19 +0300 | [diff] [blame] | 1101 | /* |
| 1102 | * Receive data from a TCP socket. |
| 1103 | */ |
| 1104 | static int svc_tcp_recvfrom(struct svc_rqst *rqstp) |
| 1105 | { |
| 1106 | struct svc_sock *svsk = |
| 1107 | container_of(rqstp->rq_xprt, struct svc_sock, sk_xprt); |
| 1108 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
| 1109 | int len; |
| 1110 | struct kvec *vec; |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 1111 | unsigned int want, base; |
Trond Myklebust | 586c52c | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1112 | __be32 *p; |
| 1113 | __be32 calldir; |
Trond Myklebust | 5ee78d4 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1114 | int pnum; |
Alexandros Batsakis | 8f55f3c | 2009-08-20 03:34:19 +0300 | [diff] [blame] | 1115 | |
| 1116 | dprintk("svc: tcp_recv %p data %d conn %d close %d\n", |
| 1117 | svsk, test_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags), |
| 1118 | test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), |
| 1119 | test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); |
| 1120 | |
| 1121 | len = svc_tcp_recv_record(svsk, rqstp); |
| 1122 | if (len < 0) |
| 1123 | goto error; |
| 1124 | |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 1125 | base = svc_tcp_restore_pages(svsk, rqstp); |
| 1126 | want = svsk->sk_reclen - base; |
| 1127 | |
NeilBrown | 3cc03b1 | 2006-10-04 02:15:47 -0700 | [diff] [blame] | 1128 | vec = rqstp->rq_vec; |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 1129 | |
Trond Myklebust | 586c52c | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1130 | pnum = copy_pages_to_kvecs(&vec[0], &rqstp->rq_pages[0], |
| 1131 | svsk->sk_reclen); |
Rahul Iyer | 4cfc7e6 | 2009-09-10 17:32:28 +0300 | [diff] [blame] | 1132 | |
NeilBrown | 4452435 | 2006-10-04 02:15:46 -0700 | [diff] [blame] | 1133 | rqstp->rq_respages = &rqstp->rq_pages[pnum]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | |
| 1135 | /* Now receive data */ |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 1136 | len = svc_partial_recvfrom(rqstp, vec, pnum, want, base); |
| 1137 | if (len >= 0) |
| 1138 | svsk->sk_tcplen += len; |
| 1139 | if (len != want) { |
| 1140 | if (len < 0 && len != -EAGAIN) |
| 1141 | goto err_other; |
| 1142 | svc_tcp_save_pages(svsk, rqstp); |
| 1143 | dprintk("svc: incomplete TCP record (%d of %d)\n", |
| 1144 | svsk->sk_tcplen, svsk->sk_reclen); |
| 1145 | goto err_noclose; |
| 1146 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | |
Trond Myklebust | 5ee78d4 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1148 | rqstp->rq_arg.len = svsk->sk_reclen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | rqstp->rq_arg.page_base = 0; |
Trond Myklebust | 5ee78d4 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1150 | if (rqstp->rq_arg.len <= rqstp->rq_arg.head[0].iov_len) { |
| 1151 | rqstp->rq_arg.head[0].iov_len = rqstp->rq_arg.len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | rqstp->rq_arg.page_len = 0; |
Trond Myklebust | 5ee78d4 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1153 | } else |
| 1154 | rqstp->rq_arg.page_len = rqstp->rq_arg.len - rqstp->rq_arg.head[0].iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | |
Tom Tucker | 5148bf4 | 2007-12-30 21:07:25 -0600 | [diff] [blame] | 1156 | rqstp->rq_xprt_ctxt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | rqstp->rq_prot = IPPROTO_TCP; |
| 1158 | |
Trond Myklebust | 586c52c | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1159 | p = (__be32 *)rqstp->rq_arg.head[0].iov_base; |
| 1160 | calldir = p[1]; |
J. Bruce Fields | 8985ef0 | 2011-04-09 10:03:10 -0400 | [diff] [blame] | 1161 | if (calldir) |
Trond Myklebust | 586c52c | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1162 | len = receive_cb_reply(svsk, rqstp); |
Trond Myklebust | 586c52c | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | /* Reset TCP read info */ |
| 1165 | svsk->sk_reclen = 0; |
| 1166 | svsk->sk_tcplen = 0; |
Trond Myklebust | 0601f79 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1167 | /* If we have more data, signal svc_xprt_enqueue() to try again */ |
| 1168 | if (svc_recv_available(svsk) > sizeof(rpc_fraghdr)) |
| 1169 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
| 1170 | |
J. Bruce Fields | 8985ef0 | 2011-04-09 10:03:10 -0400 | [diff] [blame] | 1171 | if (len < 0) |
| 1172 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 1174 | svc_xprt_copy_addrs(rqstp, &svsk->sk_xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | if (serv->sv_stats) |
| 1176 | serv->sv_stats->nettcpcnt++; |
| 1177 | |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 1178 | dprintk("svc: TCP complete record (%d bytes)\n", rqstp->rq_arg.len); |
Trond Myklebust | 5ee78d4 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1179 | return rqstp->rq_arg.len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | |
Alexandros Batsakis | 8f55f3c | 2009-08-20 03:34:19 +0300 | [diff] [blame] | 1181 | error: |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 1182 | if (len != -EAGAIN) |
| 1183 | goto err_other; |
| 1184 | dprintk("RPC: TCP recvfrom got EAGAIN\n"); |
Alexandros Batsakis | 8f55f3c | 2009-08-20 03:34:19 +0300 | [diff] [blame] | 1185 | return -EAGAIN; |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 1186 | err_other: |
| 1187 | printk(KERN_NOTICE "%s: recvfrom returned errno %d\n", |
| 1188 | svsk->sk_xprt.xpt_server->sv_name, -len); |
| 1189 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
| 1190 | err_noclose: |
| 1191 | return -EAGAIN; /* record not complete */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | } |
| 1193 | |
| 1194 | /* |
| 1195 | * Send out data on TCP socket. |
| 1196 | */ |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1197 | static int svc_tcp_sendto(struct svc_rqst *rqstp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | { |
| 1199 | struct xdr_buf *xbufp = &rqstp->rq_res; |
| 1200 | int sent; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1201 | __be32 reclen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | |
| 1203 | /* Set up the first element of the reply kvec. |
| 1204 | * Any other kvecs that may be in use have been taken |
| 1205 | * care of by the server implementation itself. |
| 1206 | */ |
| 1207 | reclen = htonl(0x80000000|((xbufp->len ) - 4)); |
| 1208 | memcpy(xbufp->head[0].iov_base, &reclen, 4); |
| 1209 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | sent = svc_sendto(rqstp, &rqstp->rq_res); |
| 1211 | if (sent != xbufp->len) { |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1212 | printk(KERN_NOTICE |
| 1213 | "rpc-srv/tcp: %s: %s %d when sending %d bytes " |
| 1214 | "- shutting down socket\n", |
Tom Tucker | 57b1d3b | 2007-12-30 21:08:22 -0600 | [diff] [blame] | 1215 | rqstp->rq_xprt->xpt_server->sv_name, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1216 | (sent<0)?"got error":"sent only", |
| 1217 | sent, xbufp->len); |
Tom Tucker | 57b1d3b | 2007-12-30 21:08:22 -0600 | [diff] [blame] | 1218 | set_bit(XPT_CLOSE, &rqstp->rq_xprt->xpt_flags); |
Tom Tucker | f6150c3 | 2007-12-30 21:07:57 -0600 | [diff] [blame] | 1219 | svc_xprt_enqueue(rqstp->rq_xprt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | sent = -EAGAIN; |
| 1221 | } |
| 1222 | return sent; |
| 1223 | } |
| 1224 | |
Tom Tucker | e831fe6 | 2007-12-30 21:07:29 -0600 | [diff] [blame] | 1225 | /* |
| 1226 | * Setup response header. TCP has a 4B record length field. |
| 1227 | */ |
| 1228 | static void svc_tcp_prep_reply_hdr(struct svc_rqst *rqstp) |
| 1229 | { |
| 1230 | struct kvec *resv = &rqstp->rq_res.head[0]; |
| 1231 | |
| 1232 | /* tcp needs a space for the record length... */ |
| 1233 | svc_putnl(resv, 0); |
| 1234 | } |
| 1235 | |
Tom Tucker | 323bee3 | 2007-12-30 21:07:31 -0600 | [diff] [blame] | 1236 | static int svc_tcp_has_wspace(struct svc_xprt *xprt) |
| 1237 | { |
Tom Tucker | 57b1d3b | 2007-12-30 21:08:22 -0600 | [diff] [blame] | 1238 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
Trond Myklebust | 47fcb03 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1239 | struct svc_serv *serv = svsk->sk_xprt.xpt_server; |
Tom Tucker | 323bee3 | 2007-12-30 21:07:31 -0600 | [diff] [blame] | 1240 | int required; |
Tom Tucker | 323bee3 | 2007-12-30 21:07:31 -0600 | [diff] [blame] | 1241 | |
Trond Myklebust | 47fcb03 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1242 | if (test_bit(XPT_LISTENER, &xprt->xpt_flags)) |
| 1243 | return 1; |
| 1244 | required = atomic_read(&xprt->xpt_reserved) + serv->sv_max_mesg; |
| 1245 | if (sk_stream_wspace(svsk->sk_sk) >= required) |
| 1246 | return 1; |
Tom Tucker | 323bee3 | 2007-12-30 21:07:31 -0600 | [diff] [blame] | 1247 | set_bit(SOCK_NOSPACE, &svsk->sk_sock->flags); |
Trond Myklebust | 47fcb03 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1248 | return 0; |
Tom Tucker | 323bee3 | 2007-12-30 21:07:31 -0600 | [diff] [blame] | 1249 | } |
| 1250 | |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 1251 | static struct svc_xprt *svc_tcp_create(struct svc_serv *serv, |
Pavel Emelyanov | 62832c0 | 2010-09-29 16:04:18 +0400 | [diff] [blame] | 1252 | struct net *net, |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 1253 | struct sockaddr *sa, int salen, |
| 1254 | int flags) |
| 1255 | { |
Pavel Emelyanov | 62832c0 | 2010-09-29 16:04:18 +0400 | [diff] [blame] | 1256 | return svc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 1257 | } |
| 1258 | |
Trond Myklebust | 9e00abc | 2011-07-13 19:20:49 -0400 | [diff] [blame] | 1259 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
Andy Adamson | 1f11a03 | 2011-01-06 02:04:26 +0000 | [diff] [blame] | 1260 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *, int, |
| 1261 | struct net *, struct sockaddr *, |
| 1262 | int, int); |
| 1263 | static void svc_bc_sock_free(struct svc_xprt *xprt); |
| 1264 | |
| 1265 | static struct svc_xprt *svc_bc_tcp_create(struct svc_serv *serv, |
| 1266 | struct net *net, |
| 1267 | struct sockaddr *sa, int salen, |
| 1268 | int flags) |
| 1269 | { |
| 1270 | return svc_bc_create_socket(serv, IPPROTO_TCP, net, sa, salen, flags); |
| 1271 | } |
| 1272 | |
| 1273 | static void svc_bc_tcp_sock_detach(struct svc_xprt *xprt) |
| 1274 | { |
| 1275 | } |
| 1276 | |
| 1277 | static struct svc_xprt_ops svc_tcp_bc_ops = { |
| 1278 | .xpo_create = svc_bc_tcp_create, |
| 1279 | .xpo_detach = svc_bc_tcp_sock_detach, |
| 1280 | .xpo_free = svc_bc_sock_free, |
| 1281 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
| 1282 | }; |
| 1283 | |
| 1284 | static struct svc_xprt_class svc_tcp_bc_class = { |
| 1285 | .xcl_name = "tcp-bc", |
| 1286 | .xcl_owner = THIS_MODULE, |
| 1287 | .xcl_ops = &svc_tcp_bc_ops, |
| 1288 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
| 1289 | }; |
Andy Adamson | 16b2d1e | 2011-01-06 02:04:27 +0000 | [diff] [blame] | 1290 | |
| 1291 | static void svc_init_bc_xprt_sock(void) |
| 1292 | { |
| 1293 | svc_reg_xprt_class(&svc_tcp_bc_class); |
| 1294 | } |
| 1295 | |
| 1296 | static void svc_cleanup_bc_xprt_sock(void) |
| 1297 | { |
| 1298 | svc_unreg_xprt_class(&svc_tcp_bc_class); |
| 1299 | } |
Trond Myklebust | 9e00abc | 2011-07-13 19:20:49 -0400 | [diff] [blame] | 1300 | #else /* CONFIG_SUNRPC_BACKCHANNEL */ |
Andy Adamson | 16b2d1e | 2011-01-06 02:04:27 +0000 | [diff] [blame] | 1301 | static void svc_init_bc_xprt_sock(void) |
| 1302 | { |
| 1303 | } |
| 1304 | |
| 1305 | static void svc_cleanup_bc_xprt_sock(void) |
| 1306 | { |
| 1307 | } |
Trond Myklebust | 9e00abc | 2011-07-13 19:20:49 -0400 | [diff] [blame] | 1308 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |
Andy Adamson | 1f11a03 | 2011-01-06 02:04:26 +0000 | [diff] [blame] | 1309 | |
Tom Tucker | 360d873 | 2007-12-30 21:07:17 -0600 | [diff] [blame] | 1310 | static struct svc_xprt_ops svc_tcp_ops = { |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 1311 | .xpo_create = svc_tcp_create, |
Tom Tucker | 5d13799 | 2007-12-30 21:07:23 -0600 | [diff] [blame] | 1312 | .xpo_recvfrom = svc_tcp_recvfrom, |
| 1313 | .xpo_sendto = svc_tcp_sendto, |
Tom Tucker | 5148bf4 | 2007-12-30 21:07:25 -0600 | [diff] [blame] | 1314 | .xpo_release_rqst = svc_release_skb, |
Trond Myklebust | 69b6ba3 | 2008-12-23 16:30:11 -0500 | [diff] [blame] | 1315 | .xpo_detach = svc_tcp_sock_detach, |
Tom Tucker | 755ccea | 2007-12-30 21:07:27 -0600 | [diff] [blame] | 1316 | .xpo_free = svc_sock_free, |
Tom Tucker | e831fe6 | 2007-12-30 21:07:29 -0600 | [diff] [blame] | 1317 | .xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr, |
Tom Tucker | 323bee3 | 2007-12-30 21:07:31 -0600 | [diff] [blame] | 1318 | .xpo_has_wspace = svc_tcp_has_wspace, |
Tom Tucker | 38a417c | 2007-12-30 21:07:36 -0600 | [diff] [blame] | 1319 | .xpo_accept = svc_tcp_accept, |
Tom Tucker | 360d873 | 2007-12-30 21:07:17 -0600 | [diff] [blame] | 1320 | }; |
| 1321 | |
| 1322 | static struct svc_xprt_class svc_tcp_class = { |
| 1323 | .xcl_name = "tcp", |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 1324 | .xcl_owner = THIS_MODULE, |
Tom Tucker | 360d873 | 2007-12-30 21:07:17 -0600 | [diff] [blame] | 1325 | .xcl_ops = &svc_tcp_ops, |
Tom Tucker | 4902315 | 2007-12-30 21:07:21 -0600 | [diff] [blame] | 1326 | .xcl_max_payload = RPCSVC_MAXPAYLOAD_TCP, |
Tom Tucker | 360d873 | 2007-12-30 21:07:17 -0600 | [diff] [blame] | 1327 | }; |
| 1328 | |
| 1329 | void svc_init_xprt_sock(void) |
| 1330 | { |
| 1331 | svc_reg_xprt_class(&svc_tcp_class); |
| 1332 | svc_reg_xprt_class(&svc_udp_class); |
Andy Adamson | 16b2d1e | 2011-01-06 02:04:27 +0000 | [diff] [blame] | 1333 | svc_init_bc_xprt_sock(); |
Tom Tucker | 360d873 | 2007-12-30 21:07:17 -0600 | [diff] [blame] | 1334 | } |
| 1335 | |
| 1336 | void svc_cleanup_xprt_sock(void) |
| 1337 | { |
| 1338 | svc_unreg_xprt_class(&svc_tcp_class); |
| 1339 | svc_unreg_xprt_class(&svc_udp_class); |
Andy Adamson | 16b2d1e | 2011-01-06 02:04:27 +0000 | [diff] [blame] | 1340 | svc_cleanup_bc_xprt_sock(); |
Tom Tucker | 360d873 | 2007-12-30 21:07:17 -0600 | [diff] [blame] | 1341 | } |
| 1342 | |
Tom Tucker | bb5cf16 | 2007-12-30 21:07:50 -0600 | [diff] [blame] | 1343 | static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | { |
| 1345 | struct sock *sk = svsk->sk_sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | |
Stanislav Kinsbursky | bd4620d | 2011-12-06 14:19:10 +0300 | [diff] [blame] | 1347 | svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class, |
| 1348 | &svsk->sk_xprt, serv); |
Tom Tucker | def13d7 | 2007-12-30 21:08:08 -0600 | [diff] [blame] | 1349 | set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | if (sk->sk_state == TCP_LISTEN) { |
| 1351 | dprintk("setting up TCP socket for listening\n"); |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 1352 | set_bit(XPT_LISTENER, &svsk->sk_xprt.xpt_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | sk->sk_data_ready = svc_tcp_listen_data_ready; |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 1354 | set_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | } else { |
| 1356 | dprintk("setting up TCP socket for reading\n"); |
| 1357 | sk->sk_state_change = svc_tcp_state_change; |
| 1358 | sk->sk_data_ready = svc_tcp_data_ready; |
Trond Myklebust | 47fcb03 | 2009-05-18 17:47:56 -0400 | [diff] [blame] | 1359 | sk->sk_write_space = svc_tcp_write_space; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | |
| 1361 | svsk->sk_reclen = 0; |
| 1362 | svsk->sk_tcplen = 0; |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 1363 | memset(&svsk->sk_pages[0], 0, sizeof(svsk->sk_pages)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | |
Chuck Lever | b7872fe | 2008-04-14 12:27:01 -0400 | [diff] [blame] | 1365 | tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 1367 | set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 1368 | if (sk->sk_state != TCP_ESTABLISHED) |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 1369 | set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | } |
| 1371 | } |
| 1372 | |
Tom Tucker | 0f0257e | 2007-12-30 21:08:27 -0600 | [diff] [blame] | 1373 | void svc_sock_update_bufs(struct svc_serv *serv) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | { |
| 1375 | /* |
| 1376 | * The number of server threads has changed. Update |
| 1377 | * rcvbuf and sndbuf accordingly on all sockets |
| 1378 | */ |
Pavel Emelyanov | 8f3a6de | 2010-10-05 23:30:19 +0400 | [diff] [blame] | 1379 | struct svc_sock *svsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1380 | |
| 1381 | spin_lock_bh(&serv->sv_lock); |
Pavel Emelyanov | 8f3a6de | 2010-10-05 23:30:19 +0400 | [diff] [blame] | 1382 | list_for_each_entry(svsk, &serv->sv_permsocks, sk_xprt.xpt_list) |
Tom Tucker | 02fc6c3 | 2007-12-30 21:07:48 -0600 | [diff] [blame] | 1383 | set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | spin_unlock_bh(&serv->sv_lock); |
| 1385 | } |
Trond Myklebust | 24c3767 | 2008-12-23 16:30:12 -0500 | [diff] [blame] | 1386 | EXPORT_SYMBOL_GPL(svc_sock_update_bufs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | |
| 1388 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | * Initialize socket for RPC use and create svc_sock struct |
| 1390 | * XXX: May want to setsockopt SO_SNDBUF and SO_RCVBUF. |
| 1391 | */ |
Chuck Lever | 6b17433 | 2007-02-12 00:53:28 -0800 | [diff] [blame] | 1392 | static struct svc_sock *svc_setup_socket(struct svc_serv *serv, |
| 1393 | struct socket *sock, |
| 1394 | int *errp, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1395 | { |
| 1396 | struct svc_sock *svsk; |
| 1397 | struct sock *inet; |
Chuck Lever | 6b17433 | 2007-02-12 00:53:28 -0800 | [diff] [blame] | 1398 | int pmap_register = !(flags & SVC_SOCK_ANONYMOUS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1399 | |
| 1400 | dprintk("svc: svc_setup_socket %p\n", sock); |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 1401 | if (!(svsk = kzalloc(sizeof(*svsk), GFP_KERNEL))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | *errp = -ENOMEM; |
| 1403 | return NULL; |
| 1404 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1405 | |
| 1406 | inet = sock->sk; |
| 1407 | |
| 1408 | /* Register socket with portmapper */ |
| 1409 | if (*errp >= 0 && pmap_register) |
Trond Myklebust | d3b773e | 2012-01-23 13:22:45 -0500 | [diff] [blame] | 1410 | *errp = svc_register(serv, sock_net(sock->sk), inet->sk_family, |
Stanislav Kinsbursky | 5247fab | 2012-01-13 14:02:48 +0400 | [diff] [blame] | 1411 | inet->sk_protocol, |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1412 | ntohs(inet_sk(inet)->inet_sport)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | |
| 1414 | if (*errp < 0) { |
| 1415 | kfree(svsk); |
| 1416 | return NULL; |
| 1417 | } |
| 1418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | inet->sk_user_data = svsk; |
| 1420 | svsk->sk_sock = sock; |
| 1421 | svsk->sk_sk = inet; |
| 1422 | svsk->sk_ostate = inet->sk_state_change; |
| 1423 | svsk->sk_odata = inet->sk_data_ready; |
| 1424 | svsk->sk_owspace = inet->sk_write_space; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | |
| 1426 | /* Initialize the socket */ |
| 1427 | if (sock->type == SOCK_DGRAM) |
Tom Tucker | bb5cf16 | 2007-12-30 21:07:50 -0600 | [diff] [blame] | 1428 | svc_udp_init(svsk, serv); |
Olga Kornievskaia | 9660439 | 2008-10-21 14:13:47 -0400 | [diff] [blame] | 1429 | else { |
| 1430 | /* initialise setting must have enough space to |
| 1431 | * receive and respond to one request. |
| 1432 | */ |
| 1433 | svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg, |
| 1434 | 4 * serv->sv_max_mesg); |
Tom Tucker | bb5cf16 | 2007-12-30 21:07:50 -0600 | [diff] [blame] | 1435 | svc_tcp_init(svsk, serv); |
Olga Kornievskaia | 9660439 | 2008-10-21 14:13:47 -0400 | [diff] [blame] | 1436 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | dprintk("svc: svc_setup_socket created %p (inet %p)\n", |
| 1439 | svsk, svsk->sk_sk); |
| 1440 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | return svsk; |
| 1442 | } |
| 1443 | |
Chuck Lever | bfba9ab | 2009-04-23 19:32:33 -0400 | [diff] [blame] | 1444 | /** |
| 1445 | * svc_addsock - add a listener socket to an RPC service |
| 1446 | * @serv: pointer to RPC service to which to add a new listener |
| 1447 | * @fd: file descriptor of the new listener |
| 1448 | * @name_return: pointer to buffer to fill in with name of listener |
| 1449 | * @len: size of the buffer |
| 1450 | * |
| 1451 | * Fills in socket name and returns positive length of name if successful. |
| 1452 | * Name is terminated with '\n'. On error, returns a negative errno |
| 1453 | * value. |
| 1454 | */ |
| 1455 | int svc_addsock(struct svc_serv *serv, const int fd, char *name_return, |
| 1456 | const size_t len) |
NeilBrown | b41b66d | 2006-10-02 02:17:48 -0700 | [diff] [blame] | 1457 | { |
| 1458 | int err = 0; |
| 1459 | struct socket *so = sockfd_lookup(fd, &err); |
| 1460 | struct svc_sock *svsk = NULL; |
| 1461 | |
| 1462 | if (!so) |
| 1463 | return err; |
Aime Le Rouzic | 205ba42 | 2010-01-26 14:03:56 -0500 | [diff] [blame] | 1464 | if ((so->sk->sk_family != PF_INET) && (so->sk->sk_family != PF_INET6)) |
NeilBrown | b41b66d | 2006-10-02 02:17:48 -0700 | [diff] [blame] | 1465 | err = -EAFNOSUPPORT; |
| 1466 | else if (so->sk->sk_protocol != IPPROTO_TCP && |
| 1467 | so->sk->sk_protocol != IPPROTO_UDP) |
| 1468 | err = -EPROTONOSUPPORT; |
| 1469 | else if (so->state > SS_UNCONNECTED) |
| 1470 | err = -EISCONN; |
| 1471 | else { |
Tom Tucker | 2da2c21 | 2008-11-23 09:58:08 -0600 | [diff] [blame] | 1472 | if (!try_module_get(THIS_MODULE)) |
| 1473 | err = -ENOENT; |
| 1474 | else |
| 1475 | svsk = svc_setup_socket(serv, so, &err, |
| 1476 | SVC_SOCK_DEFAULTS); |
NeilBrown | e79eff1 | 2007-02-12 00:53:30 -0800 | [diff] [blame] | 1477 | if (svsk) { |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 1478 | struct sockaddr_storage addr; |
| 1479 | struct sockaddr *sin = (struct sockaddr *)&addr; |
| 1480 | int salen; |
| 1481 | if (kernel_getsockname(svsk->sk_sock, sin, &salen) == 0) |
| 1482 | svc_xprt_set_local(&svsk->sk_xprt, sin, salen); |
Tom Tucker | 4e5caaa | 2007-12-30 21:08:20 -0600 | [diff] [blame] | 1483 | clear_bit(XPT_TEMP, &svsk->sk_xprt.xpt_flags); |
| 1484 | spin_lock_bh(&serv->sv_lock); |
| 1485 | list_add(&svsk->sk_xprt.xpt_list, &serv->sv_permsocks); |
| 1486 | spin_unlock_bh(&serv->sv_lock); |
Tom Tucker | a6046f7 | 2007-12-30 21:08:01 -0600 | [diff] [blame] | 1487 | svc_xprt_received(&svsk->sk_xprt); |
NeilBrown | b41b66d | 2006-10-02 02:17:48 -0700 | [diff] [blame] | 1488 | err = 0; |
Tom Tucker | 2da2c21 | 2008-11-23 09:58:08 -0600 | [diff] [blame] | 1489 | } else |
| 1490 | module_put(THIS_MODULE); |
NeilBrown | b41b66d | 2006-10-02 02:17:48 -0700 | [diff] [blame] | 1491 | } |
| 1492 | if (err) { |
| 1493 | sockfd_put(so); |
| 1494 | return err; |
| 1495 | } |
Chuck Lever | e7942b9 | 2009-04-23 19:32:48 -0400 | [diff] [blame] | 1496 | return svc_one_sock_name(svsk, name_return, len); |
NeilBrown | b41b66d | 2006-10-02 02:17:48 -0700 | [diff] [blame] | 1497 | } |
| 1498 | EXPORT_SYMBOL_GPL(svc_addsock); |
| 1499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | /* |
| 1501 | * Create socket for RPC service. |
| 1502 | */ |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 1503 | static struct svc_xprt *svc_create_socket(struct svc_serv *serv, |
| 1504 | int protocol, |
Pavel Emelyanov | 62832c0 | 2010-09-29 16:04:18 +0400 | [diff] [blame] | 1505 | struct net *net, |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 1506 | struct sockaddr *sin, int len, |
| 1507 | int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | { |
| 1509 | struct svc_sock *svsk; |
| 1510 | struct socket *sock; |
| 1511 | int error; |
| 1512 | int type; |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 1513 | struct sockaddr_storage addr; |
| 1514 | struct sockaddr *newsin = (struct sockaddr *)&addr; |
| 1515 | int newlen; |
Trond Myklebust | c69da77 | 2009-03-30 18:59:17 -0400 | [diff] [blame] | 1516 | int family; |
| 1517 | int val; |
Pavel Emelyanov | 5216a8e | 2008-02-21 10:57:45 +0300 | [diff] [blame] | 1518 | RPC_IFDEBUG(char buf[RPC_MAX_ADDRBUFLEN]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1519 | |
Chuck Lever | ad06e4b | 2007-02-12 00:53:32 -0800 | [diff] [blame] | 1520 | dprintk("svc: svc_create_socket(%s, %d, %s)\n", |
| 1521 | serv->sv_program->pg_name, protocol, |
Chuck Lever | 77f1f67 | 2007-02-12 00:53:39 -0800 | [diff] [blame] | 1522 | __svc_print_addr(sin, buf, sizeof(buf))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | |
| 1524 | if (protocol != IPPROTO_UDP && protocol != IPPROTO_TCP) { |
| 1525 | printk(KERN_WARNING "svc: only UDP and TCP " |
| 1526 | "sockets supported\n"); |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 1527 | return ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1529 | |
Trond Myklebust | c69da77 | 2009-03-30 18:59:17 -0400 | [diff] [blame] | 1530 | type = (protocol == IPPROTO_UDP)? SOCK_DGRAM : SOCK_STREAM; |
| 1531 | switch (sin->sa_family) { |
| 1532 | case AF_INET6: |
| 1533 | family = PF_INET6; |
| 1534 | break; |
| 1535 | case AF_INET: |
| 1536 | family = PF_INET; |
| 1537 | break; |
| 1538 | default: |
| 1539 | return ERR_PTR(-EINVAL); |
| 1540 | } |
| 1541 | |
Pavel Emelyanov | 14ec63c | 2010-09-29 16:06:57 +0400 | [diff] [blame] | 1542 | error = __sock_create(net, family, type, protocol, &sock, 1); |
Chuck Lever | 77f1f67 | 2007-02-12 00:53:39 -0800 | [diff] [blame] | 1543 | if (error < 0) |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 1544 | return ERR_PTR(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | |
Peter Zijlstra | ed07536 | 2006-12-06 20:35:24 -0800 | [diff] [blame] | 1546 | svc_reclassify_socket(sock); |
| 1547 | |
Trond Myklebust | c69da77 | 2009-03-30 18:59:17 -0400 | [diff] [blame] | 1548 | /* |
| 1549 | * If this is an PF_INET6 listener, we want to avoid |
| 1550 | * getting requests from IPv4 remotes. Those should |
| 1551 | * be shunted to a PF_INET listener via rpcbind. |
| 1552 | */ |
| 1553 | val = 1; |
| 1554 | if (family == PF_INET6) |
| 1555 | kernel_setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, |
| 1556 | (char *)&val, sizeof(val)); |
| 1557 | |
Eric Sesterhenn | 1811474 | 2006-09-28 14:37:07 -0700 | [diff] [blame] | 1558 | if (type == SOCK_STREAM) |
Chuck Lever | 77f1f67 | 2007-02-12 00:53:39 -0800 | [diff] [blame] | 1559 | sock->sk->sk_reuse = 1; /* allow address reuse */ |
| 1560 | error = kernel_bind(sock, sin, len); |
Eric Sesterhenn | 1811474 | 2006-09-28 14:37:07 -0700 | [diff] [blame] | 1561 | if (error < 0) |
| 1562 | goto bummer; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 1564 | newlen = len; |
| 1565 | error = kernel_getsockname(sock, newsin, &newlen); |
| 1566 | if (error < 0) |
| 1567 | goto bummer; |
| 1568 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | if (protocol == IPPROTO_TCP) { |
Sridhar Samudrala | e6242e9 | 2006-08-07 20:58:01 -0700 | [diff] [blame] | 1570 | if ((error = kernel_listen(sock, 64)) < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | goto bummer; |
| 1572 | } |
| 1573 | |
NeilBrown | e79eff1 | 2007-02-12 00:53:30 -0800 | [diff] [blame] | 1574 | if ((svsk = svc_setup_socket(serv, sock, &error, flags)) != NULL) { |
Tom Tucker | 9dbc240 | 2007-12-30 21:08:12 -0600 | [diff] [blame] | 1575 | svc_xprt_set_local(&svsk->sk_xprt, newsin, newlen); |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 1576 | return (struct svc_xprt *)svsk; |
NeilBrown | e79eff1 | 2007-02-12 00:53:30 -0800 | [diff] [blame] | 1577 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | |
| 1579 | bummer: |
| 1580 | dprintk("svc: svc_create_socket error = %d\n", -error); |
| 1581 | sock_release(sock); |
Tom Tucker | b700cbb | 2007-12-30 21:07:42 -0600 | [diff] [blame] | 1582 | return ERR_PTR(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | } |
| 1584 | |
| 1585 | /* |
Tom Tucker | 755ccea | 2007-12-30 21:07:27 -0600 | [diff] [blame] | 1586 | * Detach the svc_sock from the socket so that no |
| 1587 | * more callbacks occur. |
| 1588 | */ |
| 1589 | static void svc_sock_detach(struct svc_xprt *xprt) |
| 1590 | { |
| 1591 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| 1592 | struct sock *sk = svsk->sk_sk; |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 1593 | wait_queue_head_t *wq; |
Tom Tucker | 755ccea | 2007-12-30 21:07:27 -0600 | [diff] [blame] | 1594 | |
| 1595 | dprintk("svc: svc_sock_detach(%p)\n", svsk); |
| 1596 | |
| 1597 | /* put back the old socket callbacks */ |
| 1598 | sk->sk_state_change = svsk->sk_ostate; |
| 1599 | sk->sk_data_ready = svsk->sk_odata; |
| 1600 | sk->sk_write_space = svsk->sk_owspace; |
Trond Myklebust | 69b6ba3 | 2008-12-23 16:30:11 -0500 | [diff] [blame] | 1601 | |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 1602 | wq = sk_sleep(sk); |
| 1603 | if (wq && waitqueue_active(wq)) |
| 1604 | wake_up_interruptible(wq); |
Trond Myklebust | 69b6ba3 | 2008-12-23 16:30:11 -0500 | [diff] [blame] | 1605 | } |
| 1606 | |
| 1607 | /* |
| 1608 | * Disconnect the socket, and reset the callbacks |
| 1609 | */ |
| 1610 | static void svc_tcp_sock_detach(struct svc_xprt *xprt) |
| 1611 | { |
| 1612 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| 1613 | |
| 1614 | dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk); |
| 1615 | |
| 1616 | svc_sock_detach(xprt); |
| 1617 | |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 1618 | if (!test_bit(XPT_LISTENER, &xprt->xpt_flags)) { |
| 1619 | svc_tcp_clear_pages(svsk); |
Trond Myklebust | 69b6ba3 | 2008-12-23 16:30:11 -0500 | [diff] [blame] | 1620 | kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR); |
J. Bruce Fields | 31d68ef | 2011-02-24 11:25:33 -0800 | [diff] [blame] | 1621 | } |
Tom Tucker | 755ccea | 2007-12-30 21:07:27 -0600 | [diff] [blame] | 1622 | } |
| 1623 | |
| 1624 | /* |
| 1625 | * Free the svc_sock's socket resources and the svc_sock itself. |
| 1626 | */ |
| 1627 | static void svc_sock_free(struct svc_xprt *xprt) |
| 1628 | { |
| 1629 | struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt); |
| 1630 | dprintk("svc: svc_sock_free(%p)\n", svsk); |
| 1631 | |
Tom Tucker | 755ccea | 2007-12-30 21:07:27 -0600 | [diff] [blame] | 1632 | if (svsk->sk_sock->file) |
| 1633 | sockfd_put(svsk->sk_sock); |
| 1634 | else |
| 1635 | sock_release(svsk->sk_sock); |
| 1636 | kfree(svsk); |
| 1637 | } |
Benny Halevy | 7652e5a | 2009-04-01 09:23:09 -0400 | [diff] [blame] | 1638 | |
Trond Myklebust | 9e00abc | 2011-07-13 19:20:49 -0400 | [diff] [blame] | 1639 | #if defined(CONFIG_SUNRPC_BACKCHANNEL) |
Benny Halevy | 7652e5a | 2009-04-01 09:23:09 -0400 | [diff] [blame] | 1640 | /* |
Andy Adamson | 1f11a03 | 2011-01-06 02:04:26 +0000 | [diff] [blame] | 1641 | * Create a back channel svc_xprt which shares the fore channel socket. |
Benny Halevy | 7652e5a | 2009-04-01 09:23:09 -0400 | [diff] [blame] | 1642 | */ |
Andy Adamson | 1f11a03 | 2011-01-06 02:04:26 +0000 | [diff] [blame] | 1643 | static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, |
| 1644 | int protocol, |
| 1645 | struct net *net, |
| 1646 | struct sockaddr *sin, int len, |
| 1647 | int flags) |
Benny Halevy | 7652e5a | 2009-04-01 09:23:09 -0400 | [diff] [blame] | 1648 | { |
| 1649 | struct svc_sock *svsk; |
Andy Adamson | 1f11a03 | 2011-01-06 02:04:26 +0000 | [diff] [blame] | 1650 | struct svc_xprt *xprt; |
Benny Halevy | 7652e5a | 2009-04-01 09:23:09 -0400 | [diff] [blame] | 1651 | |
Andy Adamson | 1f11a03 | 2011-01-06 02:04:26 +0000 | [diff] [blame] | 1652 | if (protocol != IPPROTO_TCP) { |
| 1653 | printk(KERN_WARNING "svc: only TCP sockets" |
| 1654 | " supported on shared back channel\n"); |
| 1655 | return ERR_PTR(-EINVAL); |
| 1656 | } |
| 1657 | |
Benny Halevy | 7652e5a | 2009-04-01 09:23:09 -0400 | [diff] [blame] | 1658 | svsk = kzalloc(sizeof(*svsk), GFP_KERNEL); |
| 1659 | if (!svsk) |
Andy Adamson | 1f11a03 | 2011-01-06 02:04:26 +0000 | [diff] [blame] | 1660 | return ERR_PTR(-ENOMEM); |
Benny Halevy | 7652e5a | 2009-04-01 09:23:09 -0400 | [diff] [blame] | 1661 | |
| 1662 | xprt = &svsk->sk_xprt; |
Stanislav Kinsbursky | bd4620d | 2011-12-06 14:19:10 +0300 | [diff] [blame] | 1663 | svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); |
Andy Adamson | 1f11a03 | 2011-01-06 02:04:26 +0000 | [diff] [blame] | 1664 | |
Andy Adamson | 4a19de0 | 2011-01-06 02:04:35 +0000 | [diff] [blame] | 1665 | serv->sv_bc_xprt = xprt; |
Andy Adamson | 1f11a03 | 2011-01-06 02:04:26 +0000 | [diff] [blame] | 1666 | |
Benny Halevy | 7652e5a | 2009-04-01 09:23:09 -0400 | [diff] [blame] | 1667 | return xprt; |
| 1668 | } |
Benny Halevy | 7652e5a | 2009-04-01 09:23:09 -0400 | [diff] [blame] | 1669 | |
| 1670 | /* |
Andy Adamson | 1f11a03 | 2011-01-06 02:04:26 +0000 | [diff] [blame] | 1671 | * Free a back channel svc_sock. |
Benny Halevy | 7652e5a | 2009-04-01 09:23:09 -0400 | [diff] [blame] | 1672 | */ |
Andy Adamson | 1f11a03 | 2011-01-06 02:04:26 +0000 | [diff] [blame] | 1673 | static void svc_bc_sock_free(struct svc_xprt *xprt) |
Benny Halevy | 7652e5a | 2009-04-01 09:23:09 -0400 | [diff] [blame] | 1674 | { |
Andy Adamson | 778be23 | 2011-01-25 15:38:01 +0000 | [diff] [blame] | 1675 | if (xprt) |
Benny Halevy | 7652e5a | 2009-04-01 09:23:09 -0400 | [diff] [blame] | 1676 | kfree(container_of(xprt, struct svc_sock, sk_xprt)); |
| 1677 | } |
Trond Myklebust | 9e00abc | 2011-07-13 19:20:49 -0400 | [diff] [blame] | 1678 | #endif /* CONFIG_SUNRPC_BACKCHANNEL */ |