diff options
| -rw-r--r-- | net/ipv4/raw.c | 62 |
1 files changed, 54 insertions, 8 deletions
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c index 9be905057b24..43385a9fa441 100644 --- a/net/ipv4/raw.c +++ b/net/ipv4/raw.c @@ -79,6 +79,16 @@ #include <linux/netfilter.h> #include <linux/netfilter_ipv4.h> #include <linux/compat.h> +#include <linux/uio.h> + +struct raw_frag_vec { + struct iovec *iov; + union { + struct icmphdr icmph; + char c[1]; + } hdr; + int hlen; +}; static struct raw_hashinfo raw_v4_hashinfo = { .lock = __RW_LOCK_UNLOCKED(raw_v4_hashinfo.lock), @@ -420,25 +430,57 @@ error: return err; } -static int raw_probe_proto_opt(struct flowi4 *fl4, struct msghdr *msg) +static int raw_probe_proto_opt(struct raw_frag_vec *rfv, struct flowi4 *fl4) { - struct icmphdr icmph; int err; if (fl4->flowi4_proto != IPPROTO_ICMP) return 0; /* We only need the first two bytes. */ - err = memcpy_fromiovecend((void *)&icmph, msg->msg_iov, 0, 2); + rfv->hlen = 2; + + err = memcpy_fromiovec(rfv->hdr.c, rfv->iov, rfv->hlen); if (err) return err; - fl4->fl4_icmp_type = icmph.type; - fl4->fl4_icmp_code = icmph.code; + fl4->fl4_icmp_type = rfv->hdr.icmph.type; + fl4->fl4_icmp_code = rfv->hdr.icmph.code; return 0; } +static int raw_getfrag(void *from, char *to, int offset, int len, int odd, + struct sk_buff *skb) +{ + struct raw_frag_vec *rfv = from; + + if (offset < rfv->hlen) { + int copy = min(rfv->hlen - offset, len); + + if (skb->ip_summed == CHECKSUM_PARTIAL) + memcpy(to, rfv->hdr.c + offset, copy); + else + skb->csum = csum_block_add( + skb->csum, + csum_partial_copy_nocheck(rfv->hdr.c + offset, + to, copy, 0), + odd); + + odd = 0; + offset += copy; + to += copy; + len -= copy; + + if (!len) + return 0; + } + + offset -= rfv->hlen; + + return ip_generic_getfrag(rfv->iov, to, offset, len, odd, skb); +} + static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, size_t len) { @@ -452,6 +494,7 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, u8 tos; int err; struct ip_options_data opt_copy; + struct raw_frag_vec rfv; err = -EMSGSIZE; if (len > 0xFFFF) @@ -557,7 +600,10 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, daddr, saddr, 0, 0); if (!inet->hdrincl) { - err = raw_probe_proto_opt(&fl4, msg); + rfv.iov = msg->msg_iov; + rfv.hlen = 0; + + err = raw_probe_proto_opt(&rfv, &fl4); if (err) goto done; } @@ -588,8 +634,8 @@ back_from_confirm: if (!ipc.addr) ipc.addr = fl4.daddr; lock_sock(sk); - err = ip_append_data(sk, &fl4, ip_generic_getfrag, - msg->msg_iov, len, 0, + err = ip_append_data(sk, &fl4, raw_getfrag, + &rfv, len, 0, &ipc, &rt, msg->msg_flags); if (err) ip_flush_pending_frames(sk); |