Date: Wed, 29 Aug 2001 10:14:16 +0300 From: Ruslan Ermilov <ru@FreeBSD.ORG> To: Anuranjan <anu@nttmcl.com> Cc: questions@FreeBSD.ORG Subject: Re: very urgent : trying to add a route to kernel table Message-ID: <20010829101416.B70541@sunbay.com> In-Reply-To: <001901c13026$f0aaf230$f64545d8@ntt27f48otgmw8>; from anu@nttmcl.com on Tue, Aug 28, 2001 at 06:07:13PM -0700 References: <001901c13026$f0aaf230$f64545d8@ntt27f48otgmw8>
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Your program is equivalent of doing:
# route add 4.5.6.7
route: writing to routing socket: Invalid argument
add host 4.5.6.7: Invalid argument
When adding a route, you should also specify a gateway (RTA_GATEWAY).
On Tue, Aug 28, 2001 at 06:07:13PM -0700, Anuranjan wrote:
> Hi,
> I'm trying to add an entry into the kernel routing table (my first time).
> Don't know what I'm doing wrong ... but when I try "RTM_DELETE" it works ..
> only RTM_ADD doesn't (errno says EINVAL) ... any suggestions ? Am attaching
> the code snippet here..
>
> --Anu
>
> ----------------------------------------------------------------------------
> ----------------------------------------------------------------------------
> ------------------------------
>
> process_pkt_info(char *srcIPaddr, char *dstIPaddr, int src_if_id)
> {
> int err;
> struct sockaddr_in *s;
> int sockfd, rtsockfd;
> char *buf;
> pid_t pid;
> ssize_t n;
> struct rt_msghdr *rtm;
> struct sockaddr *sa, rti_info[RTAX_MAX];
>
>
> rtsockfd = socket(AF_ROUTE, SOCK_RAW, 0);
>
> buf = (char *)calloc(1, BUFLEN);
> if(buf < 0)
> {
> printf("calloc failed");
> abort();
> }
>
> rtm = (struct rt_msghdr *)buf;
> rtm->rtm_msglen = sizeof(struct rt_msghdr) + sizeof(struct sockaddr_in);
> rtm->rtm_version = RTM_VERSION;
> rtm->rtm_type = RTM_ADD;
> rtm->rtm_addrs = RTA_DST;
> rtm->rtm_pid = pid = getpid();
> rtm->rtm_seq = SEQ;
>
> s = (struct sockaddr_in *) (rtm + 1);
> s->sin_len = sizeof(struct sockaddr_in);
> s->sin_family = AF_INET;
> s->sin_addr.s_addr = inet_addr(srcIPaddr);
>
> fwd_enable(1);
>
> if(write(rtsockfd, rtm, rtm->rtm_msglen) < 0 )
> {
> printf ("error: %d\n", errno);
> }
>
> }
>
> int main (void)
> {
> process_pkt_info("4.5.6.7", NULL, 2);
> return(0);
> }
>
>
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--
Ruslan Ermilov Oracle Developer/DBA,
ru@sunbay.com Sunbay Software AG,
ru@FreeBSD.org FreeBSD committer,
+380.652.512.251 Simferopol, Ukraine
http://www.FreeBSD.org The Power To Serve
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